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Rev | Author | Line No. | Line |
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6733 | IgorA | 1 | |
2 | |||
3 | |||
4 | ; Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson |
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5 | ; (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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6 | ; (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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7 | |||
8 | |||
9 | ; For conditions of distribution and use, see the disclaimer |
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10 | ; and license in png.inc |
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11 | |||
12 | |||
13 | ; with unsigned numbers for convenience, although one supported |
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14 | ; ancillary chunk uses signed (two's complement) numbers. |
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15 | |||
16 | |||
17 | align 4 |
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18 | proc png_save_uint_32 uses eax edi, buf:dword, i:dword |
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19 | mov eax,[i] |
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20 | bswap eax |
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21 | mov edi,[buf] |
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22 | stosd |
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23 | ret |
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24 | endp |
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25 | |||
26 | |||
27 | ; The parameter is declared unsigned int, not uint_16, |
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28 | ; just to avoid potential problems on pre-ANSI C compilers. |
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29 | |||
30 | |||
31 | align 4 |
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32 | proc png_save_uint_16 uses eax edi, buf:dword, i:dword |
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33 | mov eax,[i] |
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34 | ror eax,16 |
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35 | bswap eax |
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36 | mov edi,[buf] |
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37 | stosw |
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38 | ret |
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39 | endp |
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40 | |||
41 | |||
42 | ; the magic bytes of the signature, or more likely, the PNG stream is |
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43 | ; being embedded into another stream and doesn't need its own signature, |
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44 | ; we should call png_set_sig_bytes() to tell libpng how many of the |
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45 | ; bytes have already been written. |
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46 | |||
47 | |||
48 | png_signature db 137, 80, 78, 71, 13, 10, 26, 10 |
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49 | |||
50 | |||
51 | align 4 |
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52 | proc png_write_sig uses eax ebx edi, png_ptr:dword |
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53 | if PNG_IO_STATE_SUPPORTED eq 1 |
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54 | ; Inform the I/O callback that the signature is being written |
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55 | mov edi,[png_ptr] |
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56 | mov dword[edi+png_struct.io_state], PNG_IO_WRITING or PNG_IO_SIGNATURE |
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57 | end if |
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58 | |||
59 | |||
60 | movzx eax,byte[edi+png_struct.sig_bytes] |
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61 | mov ebx,8 |
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62 | sub ebx,eax |
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63 | add eax,png_signature |
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64 | stdcall png_write_data, edi, eax, ebx |
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65 | |||
66 | |||
67 | jge @f |
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68 | or dword[edi+png_struct.mode], PNG_HAVE_PNG_SIGNATURE |
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69 | @@: |
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70 | ret |
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71 | endp |
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72 | |||
73 | |||
74 | ; The total_length is the sum of the lengths of all the data you will be |
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75 | ; passing in png_write_chunk_data(). |
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76 | |||
77 | |||
78 | align 4 |
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79 | proc png_write_chunk_header uses ebx edi, png_ptr:dword, chunk_name:dword, length:dword |
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80 | locals |
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81 | buf rb 8 ;ebp-8 |
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82 | endl |
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83 | |||
84 | |||
85 | ; PNG_CSTRING_FROM_CHUNK(buf, chunk_name); |
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86 | ; png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length); |
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87 | ;end if |
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88 | |||
89 | |||
90 | cmp edi,0 |
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91 | je .end_f ;if (png_ptr == NULL) return |
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92 | |||
93 | |||
94 | ; Inform the I/O callback that the chunk header is being written. |
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95 | ; PNG_IO_CHUNK_HDR requires a single I/O call. |
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96 | |||
97 | |||
98 | end if |
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99 | |||
100 | |||
101 | mov ebx,ebp |
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102 | sub ebx,8 |
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103 | stdcall png_save_uint_32, ebx, [length] |
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104 | m2m dword[ebx+4],dword[chunk_name] |
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105 | stdcall png_write_data, edi, ebx, 8 |
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106 | |||
107 | |||
108 | m2m dword[edi+png_struct.chunk_name],dword[chunk_name] |
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109 | |||
110 | |||
111 | stdcall png_reset_crc, edi |
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112 | |||
113 | |||
114 | sub ebx,4 ;buf + 4 |
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115 | stdcall png_calculate_crc, edi, ebx, 4 |
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116 | |||
117 | |||
118 | ; Inform the I/O callback that chunk data will (possibly) be written. |
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119 | ; PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls. |
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120 | |||
121 | |||
122 | end if |
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123 | .end_f: |
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124 | ret |
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125 | endp |
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126 | |||
127 | |||
128 | align 4 |
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129 | proc png_write_chunk_start uses eax, png_ptr:dword, chunk_string:dword, length:dword |
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130 | mov eax,[chunk_string] |
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131 | stdcall png_write_chunk_header, [png_ptr], [eax], [length] |
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132 | ret |
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133 | endp |
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134 | |||
135 | |||
136 | ; Note that multiple calls to this function are allowed, and that the |
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137 | ; sum of the lengths from these calls *must* add up to the total_length |
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138 | ; given to png_write_chunk_header(). |
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139 | |||
140 | |||
141 | align 4 |
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142 | proc png_write_chunk_data uses edi, png_ptr:dword, p2data:dword, length:dword |
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143 | ; Write the data, and run the CRC over it |
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144 | mov edi,[png_ptr] |
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145 | cmp edi,0 |
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146 | je .end_f ;if (..==0) return |
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147 | |||
148 | |||
149 | je .end_f |
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150 | cmp dword[length],0 |
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151 | jle .end_f ;if (..!=0 && ..>0) |
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152 | stdcall png_write_data, edi, [p2data], [length] |
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153 | ; Update the CRC after writing the data, |
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154 | ; in case the user I/O routine alters it. |
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155 | stdcall png_calculate_crc, edi, [p2data], [length] |
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156 | .end_f: |
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157 | ret |
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158 | endp |
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159 | |||
160 | |||
161 | ;void (png_structrp png_ptr) |
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162 | align 4 |
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163 | proc png_write_chunk_end uses ebx edi, png_ptr:dword |
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164 | locals |
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165 | buf rb 4 ;ebp-4 |
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166 | endl |
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167 | mov edi,[png_ptr] |
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168 | cmp edi,0 |
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169 | je .end_f ;if (..==0) return |
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170 | |||
171 | |||
172 | ; Inform the I/O callback that the chunk CRC is being written. |
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173 | ; PNG_IO_CHUNK_CRC requires a single I/O function call. |
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174 | |||
175 | |||
176 | end if |
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177 | |||
178 | |||
179 | mov ebx,ebp |
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180 | sub ebx,4 |
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181 | stdcall png_save_uint_32, ebx, [edi+png_struct.crc] |
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182 | |||
183 | |||
184 | .end_f: |
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185 | ret |
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186 | endp |
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187 | |||
188 | |||
189 | ; representing the chunk name. The array must be at least 4 bytes in |
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190 | ; length, and does not need to be null terminated. To be safe, pass the |
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191 | ; pre-defined chunk names here, and if you need a new one, define it |
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192 | ; where the others are defined. The length is the length of the data. |
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193 | ; All the data must be present. If that is not possible, use the |
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194 | ; png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() |
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195 | ; functions instead. |
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196 | |||
197 | |||
198 | align 4 |
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199 | proc png_write_complete_chunk uses edi, png_ptr:dword, chunk_name:dword, p3data:dword, length:dword |
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200 | mov edi,[png_ptr] |
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201 | cmp edi,0 |
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202 | je .end_f ;if (..==0) return |
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203 | |||
204 | |||
205 | cmp dword[length],PNG_UINT_31_MAX ;if(..>..) |
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206 | jle @f |
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207 | png_error edi, 'length exceeds PNG maximum' |
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208 | @@: |
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209 | stdcall png_write_chunk_header, edi, [chunk_name], [length] |
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210 | stdcall png_write_chunk_data, edi, [p3data], [length] |
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211 | stdcall png_write_chunk_end, edi |
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212 | .end_f: |
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213 | ret |
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214 | endp |
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215 | |||
216 | |||
217 | ;void (png_structrp png_ptr, bytep chunk_string, bytep data, png_size_t length) |
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218 | align 4 |
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219 | proc png_write_chunk, png_ptr:dword, chunk_string:dword, p3data:dword, length:dword |
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220 | stdcall png_write_complete_chunk, [png_ptr], [chunk_string], [p3data], [length] |
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221 | ret |
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222 | endp |
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223 | |||
224 | |||
225 | ; so it only needs to be accurate if the size is less than 16384 bytes (the |
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226 | ; point at which a lower LZ window size can be used.) |
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227 | |||
228 | |||
229 | align 4 |
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230 | proc png_image_size uses ebx ecx edx edi esi, png_ptr:dword |
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231 | ; Only return sizes up to the maximum of a uint_32; do this by limiting |
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232 | ; the width and height used to 15 bits. |
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233 | |||
234 | |||
235 | mov ebx,[edi+png_struct.height] |
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236 | |||
237 | |||
238 | jge .end0 |
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239 | cmp ebx,32768 |
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240 | jge .end0 ;if (..<.. && ..<..) |
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241 | cmp byte[edi+png_struct.interlaced],0 |
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242 | je .end1 ;if (..!=0) |
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243 | ; Interlacing makes the image larger because of the replication of |
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244 | ; both the filter byte and the padding to a byte boundary. |
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245 | |||
246 | |||
247 | xor ecx,ecx |
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248 | .cycle0: |
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249 | PNG_PASS_COLS [edi+png_struct.width], ecx |
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250 | ;eax = pw |
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251 | |||
252 | |||
253 | jle @f ;if (..>0) |
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254 | mov edx,eax |
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255 | movzx eax,byte[edi+png_struct.pixel_depth] |
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256 | PNG_ROWBYTES eax, edx |
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257 | inc eax |
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258 | mov edx,eax |
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259 | PNG_PASS_ROWS ebx, ecx |
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260 | imul eax,edx |
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261 | add esi,eax |
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262 | @@: |
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263 | inc ecx |
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264 | cmp ecx,6 |
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265 | jle .cycle0 |
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266 | |||
267 | |||
268 | jmp .end_f |
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269 | .end1: ;else |
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270 | mov eax,[edi+png_struct.rowbytes] |
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271 | inc eax |
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272 | imul eax,ebx |
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273 | jmp .end_f |
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274 | .end0: ;else |
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275 | mov eax,0xffffffff |
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276 | .end_f: |
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277 | ret |
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278 | endp |
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279 | |||
280 | |||
281 | ; deflate header) to correct the windowBits value to match the actual data |
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282 | ; size. Note that the second argument is the *uncompressed* size but the |
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283 | ; first argument is the *compressed* data (and it must be deflate |
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284 | ; compressed.) |
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285 | |||
286 | |||
287 | align 4 |
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288 | proc optimize_cmf, p1data:dword, data_size:dword |
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289 | ; Optimize the CMF field in the zlib stream. The resultant zlib stream is |
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290 | ; still compliant to the stream specification. |
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291 | png_debug 1, 'optimize_cmf' |
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292 | pushad |
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293 | cmp dword[data_size],16384 |
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294 | jg .end_f ;if (..<=..) ;else windowBits must be 15 |
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295 | mov esi,[p1data] |
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296 | movzx ebx,byte[esi] |
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297 | ;ebx = z_cmf ;zlib compression method and flags |
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298 | |||
299 | |||
300 | and eax,0x0f |
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301 | cmp eax,8 |
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302 | jne .end_f |
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303 | mov eax,ebx |
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304 | and eax,0xf0 |
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305 | cmp eax,0x70 |
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306 | jg .end_f ;if (..==.. && ..<=..) |
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307 | ;ecx = z_cinfo |
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308 | ;edi = half_z_window_size |
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309 | |||
310 | |||
311 | shr ecx,4 |
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312 | xor edi,edi |
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313 | inc edi |
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314 | shl edi,7 |
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315 | shl edi,cl |
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316 | |||
317 | |||
318 | jg .end_f ;if (..<=..) ;else no change |
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319 | .cycle0: ;do |
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320 | shr edi,1 |
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321 | dec ecx |
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322 | cmp ecx,0 |
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323 | jle @f |
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324 | cmp [data_size],edi |
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325 | jle .cycle0 |
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326 | @@: ;while (..>0 && ..<=..); |
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327 | |||
328 | |||
329 | mov eax,ecx |
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330 | shl eax,4 |
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331 | or ebx,eax |
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332 | |||
333 | |||
334 | movzx eax,byte[esi+1] |
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335 | and eax,0xe0 |
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336 | shl ebx,8 |
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337 | add ebx,eax |
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338 | add eax,0x1f |
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339 | xchg eax,ebx |
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340 | xor edx,edx |
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341 | mov ecx,0x1f |
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342 | div ecx |
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343 | sub ebx,edx |
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344 | mov byte[esi+1],bl |
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345 | .end_f: |
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346 | popad |
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347 | ret |
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348 | endp |
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349 | |||
350 | |||
351 | ;int (png_structrp png_ptr, uint_32 owner, png_alloc_size_t data_size) |
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352 | ;input: |
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353 | ; edi - png_ptr |
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354 | align 4 |
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355 | proc png_deflate_claim uses ebx ecx, owner:dword, data_size:dword |
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356 | locals |
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357 | level dd ? ;int |
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358 | method dd ? ;int |
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359 | windowBits dd ? ;int |
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360 | memLevel dd ? ;int |
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361 | strategy dd ? ;int |
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362 | msg rb 64 ;char[64] |
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363 | endl |
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364 | png_debug 1, 'in png_deflate_claim' |
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365 | |||
366 | |||
367 | je .end0 ;if (..!=0) |
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368 | mov ebx,ebp |
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369 | sub ebx,64 |
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370 | if (PNG_WARNINGS_SUPPORTED eq 1) | (PNG_ERROR_TEXT_SUPPORTED eq 1) |
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371 | mov eax,[owner] |
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372 | mov [ebx],eax |
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373 | mov word[ebx+4],': ' |
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374 | mov eax,[edi+png_struct.zowner] |
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375 | mov [ebx+6],eax |
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376 | ; So the message that results is " |
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377 | ; internal error, but is very useful for debugging. i18n requirements |
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378 | ; are minimal. |
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379 | |||
380 | |||
381 | stdcall png_safecat, ebx, 64, 10, eax |
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382 | end if |
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383 | if PNG_RELEASE_BUILD eq 1 |
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384 | png_warning edi, ebx |
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385 | |||
386 | |||
387 | cmp dword[edi+png_struct.zowner],png_IDAT |
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388 | jne @f ;if (..==.) ;don't steal from IDAT |
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389 | cStr dword[edi+png_struct.zstream.msg],'in use by IDAT' |
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390 | mov eax,Z_STREAM_ERROR |
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391 | jmp .end_f |
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392 | @@: |
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393 | mov dword[edi+png_struct.zowner],0 |
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394 | else |
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395 | png_error edi, ebx |
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396 | end if |
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397 | .end0: |
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398 | |||
399 | |||
400 | mov [level],eax |
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401 | mov eax,[edi+png_struct.zlib_method] |
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402 | mov [method],eax |
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403 | mov eax,[edi+png_struct.zlib_window_bits] |
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404 | mov [windowBits],eax |
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405 | mov eax,[edi+png_struct.zlib_mem_level] |
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406 | mov [memLevel],eax |
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407 | |||
408 | |||
409 | jne .end1 ;if (..==..) |
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410 | mov eax,[edi+png_struct.flags] |
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411 | and eax,PNG_FLAG_ZLIB_CUSTOM_STRATEGY |
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412 | jz @f ;if (..!=0) |
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6780 | IgorA | 413 | mov eax,[edi+png_struct.zlib_strategy] |
6733 | IgorA | 414 | mov dword[strategy],eax |
415 | jmp .end2 |
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416 | @@: |
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417 | cmp byte[edi+png_struct.do_filter],PNG_FILTER_NONE |
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418 | je @f ;else if (..!=..) |
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419 | mov dword[strategy],PNG_Z_DEFAULT_STRATEGY |
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420 | jmp .end2 |
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421 | @@: ;else |
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422 | mov dword[strategy],PNG_Z_DEFAULT_NOFILTER_STRATEGY |
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423 | jmp .end2 |
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424 | .end1: ;else |
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425 | if PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED eq 1 |
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426 | mov eax,[edi+png_struct.zlib_text_level] |
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427 | mov [level],eax |
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428 | mov eax,[edi+png_struct.zlib_text_method] |
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429 | mov [method],eax |
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430 | mov eax,[edi+png_struct.zlib_text_window_bits] |
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431 | mov [windowBits],eax |
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432 | mov eax,[edi+png_struct.zlib_text_mem_level] |
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433 | mov [memLevel],eax |
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434 | mov eax,[edi+png_struct.zlib_text_strategy] |
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435 | mov [strategy],eax |
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436 | else |
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437 | ; If customization is not supported the values all come from the |
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438 | ; IDAT values except for the strategy, which is fixed to the |
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439 | ; default. (This is the pre-1.6.0 behavior too, although it was |
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440 | ; implemented in a very different way.) |
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441 | |||
442 | |||
443 | end if |
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444 | .end2: |
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445 | |||
446 | |||
447 | ; happening just pass 32768 as the data_size parameter. Notice that zlib |
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448 | ; requires an extra 262 bytes in the window in addition to the data to be |
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449 | ; able to see the whole of the data, so if data_size+262 takes us to the |
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450 | ; next windowBits size we need to fix up the value later. (Because even |
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451 | ; though deflate needs the extra window, inflate does not!) |
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452 | |||
453 | |||
454 | jg .end3 ;if (..<=..) |
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455 | ; IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to |
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456 | ; work round a Microsoft Visual C misbehavior which, contrary to C-90, |
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457 | ; widens the result of the following shift to 64-bits if (and, |
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458 | ; apparently, only if) it is used in a test. |
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459 | |||
460 | |||
461 | dec ecx |
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462 | xor eax,eax |
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463 | inc eax |
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464 | shl eax,cl ;eax = half_window_size |
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465 | mov ecx,[data_size] |
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466 | add ecx,262 |
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467 | @@: ;while (..<=..) |
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468 | cmp ecx,eax |
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469 | jg .end3 |
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470 | shr eax,1 |
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471 | dec dword[windowBits] |
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472 | jmp @b |
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473 | .end3: |
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474 | |||
475 | |||
476 | mov eax,[edi+png_struct.flags] |
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477 | and eax,PNG_FLAG_ZSTREAM_INITIALIZED |
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478 | jz .end4 |
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6780 | IgorA | 479 | mov eax,[level] |
6733 | IgorA | 480 | cmp [edi+png_struct.zlib_set_level],eax |
481 | jne @f |
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482 | mov eax,[method] |
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483 | cmp [edi+png_struct.zlib_set_method],eax |
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484 | jne @f |
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485 | mov eax,[windowBits] |
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486 | cmp [edi+png_struct.zlib_set_window_bits],eax |
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487 | jne @f |
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488 | mov eax,[memLevel] |
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489 | cmp [edi+png_struct.zlib_set_mem_level],eax |
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490 | jne @f |
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491 | mov eax,[strategy] |
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492 | cmp [edi+png_struct.zlib_set_strategy],eax |
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493 | je .end4 |
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494 | @@: ;if (..!=0 && (..!=.. || ..!=.. || ..!=.. || ..!=.. || ..!=..)) |
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495 | mov eax,edi |
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496 | add eax,png_struct.zstream |
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497 | stdcall [deflateEnd], eax |
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498 | cmp eax,Z_OK |
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499 | je @f ;if (..!=..) |
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500 | png_warning edi, 'deflateEnd failed (ignored)' |
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501 | @@: |
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502 | and dword[edi+png_struct.flags], not PNG_FLAG_ZSTREAM_INITIALIZED |
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503 | .end4: |
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504 | |||
505 | |||
506 | ; doesn't use them on Init, but it might in the future). |
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507 | |||
508 | |||
509 | mov dword[edi+png_struct.zstream.avail_in],0 |
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510 | mov dword[edi+png_struct.zstream.next_out],0 |
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511 | mov dword[edi+png_struct.zstream.avail_out],0 |
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6797 | IgorA | 512 | |
6733 | IgorA | 513 | |
514 | ; to a simple reset to the previous parameters. |
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515 | |||
516 | |||
517 | add ecx,png_struct.zstream |
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518 | mov eax,[edi+png_struct.flags] |
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519 | and eax,PNG_FLAG_ZSTREAM_INITIALIZED |
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520 | jz @f ;if (..!=0) |
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6780 | IgorA | 521 | stdcall [deflateReset], ecx |
6733 | IgorA | 522 | jmp .end5 |
523 | @@: ;else |
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524 | stdcall [deflateInit2], ecx, [level], [method], [windowBits],\ |
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525 | [memLevel], [strategy] |
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526 | |||
527 | |||
528 | je .end5 ;if (..==..) |
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529 | or dword[edi+png_struct.flags],PNG_FLAG_ZSTREAM_INITIALIZED |
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530 | .end5: |
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531 | |||
532 | |||
533 | ; pretty much the same set of error codes. |
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534 | |||
535 | |||
536 | jne @f ;if (..==..) |
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537 | mov ecx,[owner] |
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538 | mov [edi+png_struct.zowner],ecx |
||
539 | jmp .end_f |
||
540 | @@: ;else |
||
541 | stdcall png_zstream_error, edi, eax |
||
542 | |||
543 | |||
544 | ret |
||
545 | endp |
||
546 | |||
547 | |||
548 | ;void (png_structrp png_ptr, png_compression_bufferp *listp) |
||
549 | align 4 |
||
550 | proc png_free_buffer_list uses eax ebx ecx edi, png_ptr:dword, listp:dword |
||
551 | mov eax,[listp] |
||
552 | mov ebx,[eax] |
||
553 | ;eax = png_compression_bufferp list |
||
554 | |||
555 | |||
556 | je @f ;if (..!=0) |
||
557 | mov dword[eax],0 |
||
558 | .cycle0: ;do |
||
559 | mov ecx,[ebx+png_compression_buffer.next] |
||
560 | stdcall png_free, edi, ebx |
||
561 | mov ebx,ecx |
||
562 | cmp ebx,0 |
||
563 | jne .cycle0 ;while (..!=0) |
||
564 | @@: |
||
565 | ret |
||
566 | endp |
||
567 | |||
568 | |||
569 | ; This pair of functions encapsulates the operation of (a) compressing a |
||
570 | ; text string, and (b) issuing it later as a series of chunk data writes. |
||
571 | ; The compression_state structure is shared context for these functions |
||
572 | ; set up by the caller to allow access to the relevant local variables. |
||
573 | |||
574 | |||
575 | ; temporary buffers. From 1.6.0 it is retained in png_struct so that it will |
||
576 | ; be correctly freed in the event of a write error (previous implementations |
||
577 | ; just leaked memory.) |
||
578 | |||
579 | |||
580 | input dd ? ;bytep ;The uncompressed input data |
||
581 | input_len dd ? ;png_alloc_size_t ;Its length |
||
582 | output_len dd ? ;uint_32 ;Final compressed length |
||
583 | output rb 1024 ;byte[1024] ;First block of output |
||
584 | ends |
||
585 | |||
586 | |||
587 | align 4 |
||
588 | proc png_text_compress_init uses eax ebx, comp:dword, input:dword, input_len:dword |
||
589 | mov ebx,[comp] |
||
590 | mov eax,[input] |
||
591 | mov [ebx+compression_state.input],eax |
||
592 | mov eax,[input_len] |
||
593 | mov [ebx+compression_state.input_len],eax |
||
594 | mov dword[ebx+compression_state.output_len],0 |
||
595 | ret |
||
596 | endp |
||
597 | |||
598 | |||
599 | ;int (png_structrp png_ptr, uint_32 chunk_name, compression_state *comp, uint_32 prefix_len) |
||
600 | align 4 |
||
601 | proc png_text_compress uses ebx ecx edx edi esi, png_ptr:dword, chunk_name:dword, comp:dword, prefix_len:dword |
||
602 | locals |
||
603 | output_len dd ? ;uint_32 |
||
604 | avail_in dd ? ;uInt |
||
605 | next dd ? ;png_compression_buffer* |
||
606 | endl |
||
607 | ; To find the length of the output it is necessary to first compress the |
||
608 | ; input. The result is buffered rather than using the two-pass algorithm |
||
609 | ; that is used on the inflate side; deflate is assumed to be slower and a |
||
610 | ; PNG writer is assumed to have more memory available than a PNG reader. |
||
611 | |||
612 | |||
613 | ; upper limit on the output size, but it is always bigger than the input |
||
614 | ; size so it is likely to be more efficient to use this linked-list |
||
615 | ; approach. |
||
616 | |||
617 | |||
618 | mov edi,[png_ptr] |
||
619 | stdcall png_deflate_claim, [chunk_name], [ebx+compression_state.input_len] |
||
620 | |||
621 | |||
622 | jne .end_f ;if (..!=Z_OK) return .. |
||
623 | |||
624 | |||
625 | ; uInt. Use ZLIB_IO_MAX to limit the input. The output is always limited |
||
626 | ; by the output buffer size, so there is no need to check that. Since this |
||
627 | ; is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits |
||
628 | ; in size. |
||
629 | |||
630 | |||
631 | add edx,png_struct.zbuffer_list |
||
632 | mov ecx,[ebx+compression_state.input_len] ;may be zero! |
||
633 | ;ecx = input_len |
||
634 | ;edx = end |
||
635 | ;esi = ret |
||
636 | |||
637 | |||
638 | mov eax,[ebx+compression_state.input] |
||
639 | mov [edi+png_struct.zstream.next_in],eax |
||
640 | mov dword[edi+png_struct.zstream.avail_in],0 ;Set below |
||
641 | mov eax,ebx |
||
642 | add eax,compression_state.output |
||
643 | mov [edi+png_struct.zstream.next_out],eax |
||
644 | mov eax,sizeof.compression_state.output ;1024 |
||
645 | mov [edi+png_struct.zstream.avail_out],eax |
||
6797 | IgorA | 646 | |
6733 | IgorA | 647 | |
648 | |||
649 | |||
650 | mov dword[avail_in],ZLIB_IO_MAX |
||
651 | |||
652 | |||
653 | jle @f ;if (..>..) |
||
654 | mov [avail_in],ecx |
||
655 | @@: |
||
656 | sub ecx,[avail_in] |
||
657 | |||
658 | |||
659 | mov [edi+png_struct.zstream.avail_in],eax |
||
660 | |||
661 | |||
6797 | IgorA | 662 | jne .end0 ;if (..==0) |
6733 | IgorA | 663 | ; Chunk data is limited to 2^31 bytes in length, so the prefix |
664 | ; length must be counted here. |
||
665 | |||
666 | |||
667 | add eax,[prefix_len] |
||
668 | cmp eax,PNG_UINT_31_MAX |
||
669 | jle @f ;if (..>..) |
||
670 | mov esi,Z_MEM_ERROR |
||
671 | jmp .cycle0end |
||
672 | @@: |
||
673 | |||
674 | |||
675 | ; already. |
||
676 | |||
677 | |||
678 | mov [next],eax |
||
679 | |||
680 | |||
681 | jne .end1 ;if (..==0) |
||
682 | PNG_COMPRESSION_BUFFER_SIZE edi |
||
683 | stdcall png_malloc, edi, eax |
||
684 | mov [next],eax |
||
685 | |||
686 | |||
687 | jne @f ;if (..==0) |
||
688 | mov esi,Z_MEM_ERROR |
||
689 | jmp .cycle0end |
||
690 | @@: |
||
691 | |||
692 | |||
693 | mov dword[eax+png_compression_buffer.next],0 |
||
694 | mov [edx],eax |
||
695 | .end1: |
||
696 | |||
697 | |||
698 | mov eax,[eax+png_compression_buffer.output] |
||
699 | mov [edi+png_struct.zstream.next_out],eax |
||
700 | mov eax,[edi+png_struct.zbuffer_size] |
||
701 | mov [edi+png_struct.zstream.avail_out],eax |
||
6797 | IgorA | 702 | add [output_len],eax |
6733 | IgorA | 703 | |
704 | |||
705 | mov eax,[next] |
||
706 | add eax,png_compression_buffer.next |
||
707 | mov edx,eax |
||
708 | .end0: |
||
709 | |||
710 | |||
711 | mov eax,Z_FINISH |
||
712 | cmp dword[input_len],0 |
||
713 | jle @f |
||
714 | mov eax,Z_NO_FLUSH |
||
715 | @@: |
||
716 | push eax |
||
717 | mov eax,edi |
||
718 | add eax,png_struct.zstream |
||
719 | stdcall [deflate], eax ;, ... |
||
720 | mov esi,eax |
||
721 | |||
722 | |||
723 | ; reset above every time round the loop). |
||
724 | |||
725 | |||
726 | add [input_len],eax |
||
727 | mov dword[edi+png_struct.zstream.avail_in],0 ;safety |
||
728 | cmp esi,Z_OK |
||
729 | je .cycle0 ;while (..==..) |
||
730 | .cycle0end: |
||
731 | |||
732 | |||
733 | ; be subtracted from output_len. |
||
734 | |||
735 | |||
6797 | IgorA | 736 | sub [output_len],eax |
6733 | IgorA | 737 | mov dword[edi+png_struct.zstream.avail_out],0 ;safety |
6797 | IgorA | 738 | mov eax,[output_len] |
6733 | IgorA | 739 | mov [ebx+compression_state.output_len],eax |
740 | |||
741 | |||
742 | ; too long. Otherwise ensure the z_stream::msg pointer is set to |
||
743 | ; something. |
||
744 | |||
745 | |||
746 | add eax,[prefix_len] |
||
747 | cmp eax,PNG_UINT_31_MAX |
||
748 | jl @f ;if (..>=..) |
||
749 | cStr dword[edi+png_struct.zstream.msg],'compressed data too long' |
||
750 | mov esi,Z_MEM_ERROR |
||
751 | jmp .end2 |
||
752 | @@: ;else |
||
753 | stdcall png_zstream_error, edi, esi |
||
754 | .end2: |
||
755 | |||
756 | |||
757 | mov dword[edi+png_struct.zowner],0 |
||
758 | |||
759 | |||
760 | ; is an internal error. |
||
761 | |||
762 | |||
763 | jne @f |
||
764 | cmp dword[input_len],0 |
||
765 | jne @f ;if (..==.. && ..==0) |
||
766 | if PNG_WRITE_OPTIMIZE_CMF_SUPPORTED eq 1 |
||
767 | ; Fix up the deflate header, if required |
||
768 | mov eax,ebx |
||
769 | add eax,compression_state.output |
||
770 | stdcall optimize_cmf, eax, [ebx+compression_state.input_len] |
||
771 | end if |
||
772 | ; But Z_OK is returned, not Z_STREAM_END; this allows the claim |
||
773 | ; function above to return Z_STREAM_END on an error (though it never |
||
774 | ; does in the current versions of zlib.) |
||
775 | |||
776 | |||
777 | jmp .end_f |
||
778 | @@: ;else |
||
779 | mov eax,esi |
||
780 | .end_f: |
||
781 | ret |
||
782 | endp |
||
783 | |||
784 | |||
785 | ;void (png_structrp png_ptr, compression_state *comp) |
||
786 | align 4 |
||
787 | proc png_write_compressed_data_out uses ebx edi, png_ptr:dword, comp:dword |
||
788 | locals |
||
789 | output_len dd ? ;uint_32 ;= comp.output_len |
||
790 | output dd ? ;bytep ;= comp.output |
||
791 | avail dd ? ;uint_32 ;= sizeof.comp.output |
||
792 | next dd ? ;png_compression_buffer* ;= png_ptr.zbuffer_list |
||
793 | endl |
||
794 | mov ebx,[comp] |
||
795 | mov eax,[ebx+compression_state.output_len] |
||
796 | mov [output_len],eax |
||
797 | mov eax,ebx |
||
798 | add eax,compression_state.output |
||
799 | mov [output],eax |
||
800 | mov [avail],sizeof.compression_state.output ;1024 |
||
801 | mov edi,[png_ptr] |
||
802 | mov eax,[edi+png_struct.zbuffer_list] |
||
803 | mov [next],eax |
||
804 | |||
805 | |||
806 | mov eax,[output_len] |
||
807 | cmp [avail],eax |
||
808 | jle @f ;if (..>..) |
||
809 | mov [avail],eax |
||
810 | @@: |
||
811 | |||
812 | |||
813 | |||
814 | |||
815 | sub [output_len],eax |
||
816 | |||
817 | |||
818 | je .cycle0end |
||
819 | cmp dword[next],0 |
||
820 | je .cycle0end ;if (..==0 || ..==0) break |
||
821 | |||
822 | |||
823 | mov [avail],eax |
||
824 | mov eax,[next] |
||
825 | add eax,png_compression_buffer.output |
||
826 | mov [output],eax |
||
827 | mov eax,[next] |
||
828 | mov eax,[eax+png_compression_buffer.next] |
||
829 | mov [next],eax |
||
830 | jmp .cycle0 |
||
831 | .cycle0end: |
||
832 | |||
833 | |||
834 | cmp dword[output_len],0 |
||
835 | jle @f ;if (..>0) |
||
836 | png_error edi, 'error writing ancillary chunked compressed data' |
||
837 | @@: |
||
838 | ret |
||
839 | endp |
||
840 | end if ;WRITE_COMPRESSED_TEXT |
||
841 | |||
842 | |||
843 | ; information. Note that the rest of this code depends upon this |
||
844 | ; information being correct. |
||
845 | |||
846 | |||
847 | ; int bit_depth, int color_type, int compression_type, int filter_type, int interlace_type) |
||
848 | align 4 |
||
849 | proc png_write_IHDR, png_ptr:dword, width:dword, height:dword, bit_depth:dword,\ |
||
850 | color_type:dword, compression_type:dword, filter_type:dword, interlace_type:dword |
||
851 | locals |
||
852 | buf rb 13 ;byte[13] ;Buffer to store the IHDR info |
||
853 | endl |
||
854 | png_debug 1, 'in png_write_IHDR' |
||
855 | pushad |
||
856 | ; Check that we have valid input data from the application info |
||
857 | mov edi,[png_ptr] |
||
858 | movzx ebx,byte[color_type] |
||
859 | cmp ebx,PNG_COLOR_TYPE_GRAY |
||
860 | jne .end_0 |
||
861 | cmp byte[bit_depth],1 |
||
862 | je @f |
||
863 | cmp byte[bit_depth],2 |
||
864 | je @f |
||
865 | cmp byte[bit_depth],4 |
||
866 | je @f |
||
867 | cmp byte[bit_depth],8 |
||
868 | je @f |
||
869 | if PNG_WRITE_16BIT_SUPPORTED eq 1 |
||
870 | cmp byte[bit_depth],16 |
||
871 | je @f |
||
872 | end if |
||
873 | jmp .def_0 |
||
874 | @@: |
||
875 | mov byte[edi+png_struct.channels], 1 |
||
876 | jmp .end_s0 |
||
877 | .def_0: ;default |
||
878 | png_error edi, 'Invalid bit depth for grayscale image' |
||
879 | jmp .end_s0 |
||
880 | .end_0: |
||
881 | |||
882 | |||
883 | jne .end_1 |
||
884 | cmp byte[bit_depth],8 |
||
885 | je @f ;if (..!=8) |
||
886 | if PNG_WRITE_16BIT_SUPPORTED eq 1 |
||
887 | cmp byte[bit_depth],16 |
||
888 | je @f ;if (..!=16) |
||
889 | end if |
||
890 | png_error edi, 'Invalid bit depth for RGB image' |
||
891 | @@: |
||
892 | mov byte[edi+png_struct.channels], 3 |
||
893 | jmp .end_s0 |
||
894 | .end_1: |
||
895 | |||
896 | |||
897 | jne .end_2 |
||
898 | cmp byte[bit_depth],1 |
||
899 | je @f |
||
900 | cmp byte[bit_depth],2 |
||
901 | je @f |
||
902 | cmp byte[bit_depth],4 |
||
903 | je @f |
||
904 | cmp byte[bit_depth],8 |
||
905 | je @f |
||
906 | jmp .def_1 |
||
907 | @@: |
||
908 | mov byte[edi+png_struct.channels], 1 |
||
909 | jmp .end_s0 |
||
910 | .def_1: ;default |
||
911 | png_error edi, 'Invalid bit depth for paletted image' |
||
912 | jmp .end_s0 |
||
913 | .end_2: |
||
914 | |||
915 | |||
916 | jne .end_3 |
||
917 | cmp byte[bit_depth],8 |
||
918 | je @f ;if (..!=8) |
||
919 | cmp byte[bit_depth],16 |
||
920 | je @f ;if (..!=16) |
||
921 | png_error edi, 'Invalid bit depth for grayscale+alpha image' |
||
922 | @@: |
||
923 | mov byte[edi+png_struct.channels], 2 |
||
924 | jmp .end_s0 |
||
925 | .end_3: |
||
926 | |||
927 | |||
928 | jne .end_4 |
||
929 | cmp byte[bit_depth],8 |
||
930 | je @f ;if (..!=8) |
||
931 | if PNG_WRITE_16BIT_SUPPORTED eq 1 |
||
932 | cmp byte[bit_depth],16 |
||
933 | je @f ;if (..!=16) |
||
934 | end if |
||
935 | png_error edi, 'Invalid bit depth for RGBA image' |
||
936 | @@: |
||
937 | mov byte[edi+png_struct.channels], 4 |
||
938 | jmp .end_s0 |
||
939 | .end_4: |
||
940 | |||
941 | |||
942 | png_error edi, 'Invalid image color type specified' |
||
943 | .end_s0: |
||
944 | |||
945 | |||
946 | je @f ;if (..!=..) |
||
947 | png_warning edi, 'Invalid compression type specified' |
||
948 | mov dword[compression_type], PNG_COMPRESSION_TYPE_BASE |
||
949 | @@: |
||
950 | |||
951 | |||
952 | ; 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
||
953 | ; 2. Libpng did not write a PNG signature (this filter_method is only |
||
954 | ; used in PNG datastreams that are embedded in MNG datastreams) and |
||
955 | ; 3. The application called png_permit_mng_features with a mask that |
||
956 | ; included PNG_FLAG_MNG_FILTER_64 and |
||
957 | ; 4. The filter_method is 64 and |
||
958 | ; 5. The color_type is RGB or RGBA |
||
959 | |||
960 | |||
961 | if PNG_MNG_FEATURES_SUPPORTED eq 1 |
||
962 | ; !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 && |
||
963 | ; ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && |
||
964 | ; (color_type == PNG_COLOR_TYPE_RGB || |
||
965 | ; color_type == PNG_COLOR_TYPE_RGB_ALPHA) && |
||
966 | ; (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && |
||
967 | end if |
||
968 | cmp dword[filter_type],PNG_FILTER_TYPE_BASE |
||
969 | je @f ;if (..!=..) |
||
970 | png_warning edi, 'Invalid filter type specified' |
||
971 | mov dword[filter_type], PNG_FILTER_TYPE_BASE |
||
972 | @@: |
||
973 | |||
974 | |||
975 | cmp dword[interlace_type],PNG_INTERLACE_NONE |
||
976 | je @f ;if (..!=..) |
||
977 | cmp dword[interlace_type],PNG_INTERLACE_ADAM7 |
||
978 | je @f ;if (..!=..) |
||
979 | png_warning edi, 'Invalid interlace type specified' |
||
980 | mov dword[interlace_type], PNG_INTERLACE_ADAM7 |
||
981 | @@: |
||
982 | else |
||
983 | mov dword[interlace_type], PNG_INTERLACE_NONE |
||
984 | end if |
||
985 | |||
986 | |||
987 | mov al,byte[bit_depth] |
||
988 | mov byte[edi+png_struct.bit_depth],al |
||
989 | mov al,byte[color_type] |
||
990 | mov byte[edi+png_struct.color_type],al |
||
991 | mov al,byte[interlace_type] |
||
992 | mov byte[edi+png_struct.interlaced],al |
||
993 | if PNG_MNG_FEATURES_SUPPORTED eq 1 |
||
994 | mov al,byte[filter_type] |
||
995 | mov byte[edi+png_struct.filter_type],al |
||
996 | end if |
||
997 | mov al,byte[compression_type] |
||
998 | mov byte[edi+png_struct.compression_type],al |
||
999 | mov eax,[width] |
||
1000 | mov [edi+png_struct.width],eax |
||
1001 | mov eax,[height] |
||
1002 | mov [edi+png_struct.height],eax |
||
1003 | |||
1004 | |||
1005 | imul ax,word[bit_depth] |
||
1006 | mov byte[edi+png_struct.pixel_depth],al |
||
1007 | PNG_ROWBYTES eax, [width] |
||
1008 | mov [edi+png_struct.rowbytes],eax |
||
1009 | ; Set the usr info, so any transformations can modify it |
||
1010 | mov eax,[edi+png_struct.width] |
||
1011 | mov [edi+png_struct.usr_width],eax |
||
1012 | mov al,[edi+png_struct.bit_depth] |
||
1013 | mov [edi+png_struct.usr_bit_depth],al |
||
1014 | mov al,[edi+png_struct.channels] |
||
1015 | mov [edi+png_struct.usr_channels],al |
||
1016 | |||
1017 | |||
1018 | mov ebx,ebp |
||
1019 | sub ebx,13 |
||
1020 | stdcall png_save_uint_32, ebx, [width] |
||
1021 | add ebx,4 |
||
1022 | stdcall png_save_uint_32, ebx, [height] |
||
1023 | add ebx,4 |
||
1024 | mov al,byte[bit_depth] |
||
1025 | mov byte[ebx],al ;buf[8] = (byte)bit_depth |
||
1026 | inc ebx |
||
1027 | mov al,byte[color_type] |
||
1028 | mov byte[ebx],al ;buf[9] = (byte)color_type |
||
1029 | inc ebx |
||
1030 | mov al,byte[compression_type] |
||
1031 | mov byte[ebx],al ;buf[10] = (byte)compression_type |
||
1032 | inc ebx |
||
1033 | mov al,byte[filter_type] |
||
1034 | mov byte[ebx],al ;buf[11] = (byte)filter_type |
||
1035 | inc ebx |
||
1036 | mov al,byte[interlace_type] |
||
1037 | mov byte[ebx],al ;buf[12] = (byte)interlace_type |
||
1038 | sub ebx,12 |
||
1039 | |||
1040 | |||
1041 | stdcall png_write_complete_chunk, edi, png_IHDR, ebx, dword 13 |
||
1042 | |||
1043 | |||
1044 | jne .end_5 ;if (..==..) |
||
1045 | |||
1046 | |||
1047 | je @f |
||
1048 | cmp byte[edi+png_struct.bit_depth],8 |
||
1049 | jl @f ;if ((..==..)||(..<..)) |
||
1050 | jmp .els_5 |
||
1051 | @@: |
||
1052 | mov byte[edi+png_struct.do_filter], PNG_FILTER_NONE |
||
1053 | jmp .end_5 |
||
1054 | .els_5: ;else |
||
1055 | mov byte[edi+png_struct.do_filter], PNG_ALL_FILTERS |
||
1056 | .end_5: |
||
1057 | |||
1058 | |||
1059 | popad |
||
1060 | ret |
||
1061 | endp |
||
1062 | |||
1063 | |||
1064 | ; correct order for PNG, so people can redefine it to any convenient |
||
1065 | ; structure. |
||
1066 | |||
1067 | |||
1068 | align 4 |
||
1069 | proc png_write_PLTE, png_ptr:dword, palette:dword, num_pal:dword |
||
1070 | locals |
||
1071 | ;max_palette_length dd ? ;uint_32 |
||
1072 | i dd ? |
||
1073 | pal_ptr dd ? ;png_const_colorp |
||
1074 | buf rb 3 ;byte[3] |
||
1075 | endl |
||
1076 | png_debug 1, 'in png_write_PLTE' |
||
1077 | |||
1078 | |||
1079 | mov edi,[png_ptr] |
||
1080 | movzx eax,byte[edi+png_struct.color_type] |
||
1081 | cmp eax,PNG_COLOR_TYPE_PALETTE |
||
1082 | je @f ;if (..==..) |
||
1083 | ;mov dword[max_palette_length],PNG_MAX_PALETTE_LENGTH |
||
1084 | mov eax,PNG_MAX_PALETTE_LENGTH |
||
1085 | jmp .end0 |
||
1086 | @@: |
||
1087 | mov cl,byte[edi+png_struct.bit_depth] |
||
1088 | xor eax,eax |
||
1089 | inc eax |
||
1090 | shl eax,cl |
||
1091 | ;mov [max_palette_length],eax |
||
1092 | .end0: |
||
1093 | |||
1094 | |||
1095 | cmp [num_pal],eax |
||
1096 | jg @f |
||
1097 | mov eax,[edi+png_struct.mng_features_permitted] |
||
1098 | and eax,PNG_FLAG_MNG_EMPTY_PLTE |
||
1099 | jnz .end1 |
||
6780 | IgorA | 1100 | cmp [num_pal],0 |
6733 | IgorA | 1101 | jne .end1 |
1102 | @@: |
||
1103 | end if |
||
1104 | |||
1105 | |||
1106 | jne @f |
||
1107 | png_error edi, 'Invalid number of colors in palette' |
||
1108 | jmp .end1 |
||
1109 | @@: ;else |
||
1110 | png_warning edi, 'Invalid number of colors in palette' |
||
1111 | jmp .end_f |
||
1112 | .end1: |
||
1113 | |||
1114 | |||
1115 | and eax,PNG_COLOR_MASK_COLOR |
||
1116 | jnz @f ;if (..==0) |
||
6780 | IgorA | 1117 | png_warning edi, 'Ignoring request to write a PLTE chunk in grayscale PNG' |
6733 | IgorA | 1118 | jmp .end_f |
1119 | @@: |
||
1120 | |||
1121 | |||
1122 | mov word[edi+png_struct.num_palette],ax |
||
1123 | png_debug1 3, 'num_palette = %d', eax |
||
1124 | |||
1125 | |||
1126 | stdcall png_write_chunk_header, edi, png_PLTE, eax |
||
1127 | if PNG_POINTER_INDEXING_SUPPORTED eq 1 |
||
1128 | |||
1129 | |||
1130 | ; { |
||
1131 | ; buf[0] = pal_ptr->red; |
||
1132 | ; buf[1] = pal_ptr->green; |
||
1133 | ; buf[2] = pal_ptr->blue; |
||
1134 | ; png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
||
1135 | ; } |
||
1136 | |||
1137 | |||
1138 | ; This is a little slower but some buggy compilers need to do this |
||
1139 | ; instead |
||
1140 | |||
1141 | |||
1142 | |||
1143 | |||
1144 | ; { |
||
1145 | ; buf[0] = pal_ptr[i].red; |
||
1146 | ; buf[1] = pal_ptr[i].green; |
||
1147 | ; buf[2] = pal_ptr[i].blue; |
||
1148 | ; png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
||
1149 | ; } |
||
1150 | |||
1151 | |||
1152 | stdcall png_write_chunk_end, edi |
||
1153 | or dword[edi+png_struct.mode], PNG_HAVE_PLTE |
||
1154 | .end_f: |
||
1155 | popad |
||
1156 | ret |
||
1157 | endp |
||
1158 | |||
1159 | |||
1160 | ; all of the data at once and, instead of buffering the compressed result, |
||
1161 | ; writes it as IDAT chunks. Unlike png_text_compress it *can* png_error out |
||
1162 | ; because it calls the write interface. As a result it does its own error |
||
1163 | ; reporting and does not return an error code. In the event of error it will |
||
1164 | ; just call png_error. The input data length may exceed 32-bits. The 'flush' |
||
1165 | ; parameter is exactly the same as that to deflate, with the following |
||
1166 | ; meanings: |
||
1167 | |||
1168 | |||
1169 | ; Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush |
||
1170 | ; Z_FINISH: this is the end of the input, do a Z_FINISH and clean up |
||
1171 | |||
1172 | |||
1173 | ; checking and (at the end) clearing png_ptr->zowner; it does some sanity |
||
1174 | ; checks on the 'mode' flags while doing this. |
||
1175 | |||
1176 | |||
1177 | ;input: |
||
1178 | ; edi - png_ptr |
||
1179 | align 4 |
||
1180 | proc png_compress_IDAT uses eax ebx ecx edx, input:dword, input_len:dword, flush:dword |
||
1181 | png_debug 1, 'in png_compress_IDAT' |
||
1182 | cmp dword[edi+png_struct.zowner],png_IDAT |
||
1183 | je .end0 ;if (..!=..) |
||
1184 | ; First time. Ensure we have a temporary buffer for compression and |
||
1185 | ; trim the buffer list if it has more than one entry to free memory. |
||
1186 | ; If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been |
||
1187 | ; created at this point, but the check here is quick and safe. |
||
1188 | |||
1189 | |||
1190 | jne @f ;if (..==0) |
||
1191 | PNG_COMPRESSION_BUFFER_SIZE edi |
||
1192 | stdcall png_malloc, edi, eax |
||
1193 | mov [edi+png_struct.zbuffer_list],eax |
||
1194 | mov dword[eax+png_compression_buffer.next],0 |
||
1195 | jmp .end1 |
||
1196 | @@: ;else |
||
1197 | mov eax,[edi+png_struct.zbuffer_list] |
||
1198 | add eax,png_compression_buffer.next |
||
1199 | ;eax = &...next |
||
1200 | stdcall png_free_buffer_list, edi, eax |
||
1201 | .end1: |
||
1202 | |||
1203 | |||
1204 | stdcall png_image_size, edi |
||
1205 | stdcall png_deflate_claim, png_IDAT, eax |
||
1206 | cmp eax,Z_OK |
||
1207 | je @f ;if (..!=..) |
||
1208 | png_error edi, [edi+png_struct.zstream.msg] |
||
1209 | @@: |
||
1210 | |||
1211 | |||
1212 | ; initialized here after the claim. |
||
1213 | |||
1214 | |||
1215 | add eax,png_compression_buffer.output |
||
1216 | mov [edi+png_struct.zstream.next_out],eax |
||
1217 | mov eax,[edi+png_struct.zbuffer_size] |
||
1218 | mov [edi+png_struct.zstream.avail_out],eax |
||
6797 | IgorA | 1219 | .end0: |
6733 | IgorA | 1220 | |
1221 | |||
1222 | ; terminates the operation. The _out values are maintained across calls to |
||
1223 | ; this function, but the input must be reset each time. |
||
1224 | |||
1225 | |||
1226 | mov [edi+png_struct.zstream.next_in],eax |
||
1227 | mov dword[edi+png_struct.zstream.avail_in],0 ;set below |
||
1228 | align 4 |
||
1229 | .cycle0: |
||
1230 | ;INPUT: from the row data |
||
1231 | mov eax,ZLIB_IO_MAX |
||
1232 | |||
1233 | |||
1234 | jle @f ;if (..>..) |
||
1235 | mov eax,[input_len] ;safe because of the check |
||
1236 | @@: |
||
1237 | |||
1238 | |||
1239 | sub [input_len],eax |
||
1240 | |||
1241 | |||
1242 | cmp dword[input_len],0 |
||
1243 | jle @f |
||
1244 | mov eax,Z_NO_FLUSH |
||
1245 | @@: |
||
1246 | mov ecx,edi |
||
1247 | add ecx,png_struct.zstream |
||
1248 | stdcall [deflate], ecx, eax |
||
1249 | mov ebx,eax |
||
1250 | |||
1251 | |||
1252 | mov eax,[edi+png_struct.zstream.avail_in] |
||
1253 | add [input_len],eax |
||
1254 | mov dword[edi+png_struct.zstream.avail_in],0 |
||
1255 | |||
1256 | |||
1257 | ; that these two zstream fields are preserved across the calls, therefore |
||
1258 | ; there is no need to set these up on entry to the loop. |
||
1259 | |||
1260 | |||
6797 | IgorA | 1261 | jne .end2 ;if (..==0) |
6733 | IgorA | 1262 | mov edx,[edi+png_struct.zbuffer_list] |
1263 | add edx,png_compression_buffer.output |
||
1264 | mov ecx,[edi+png_struct.zbuffer_size] |
||
1265 | ;edx = data |
||
1266 | ;ecx = size |
||
1267 | ; Write an IDAT containing the data then reset the buffer. The |
||
1268 | ; first IDAT may need deflate header optimization. |
||
1269 | |||
1270 | |||
1271 | mov eax,[edi+png_struct.mode] |
||
1272 | and eax,PNG_HAVE_IDAT |
||
1273 | jnz @f |
||
6780 | IgorA | 1274 | cmp byte[edi+png_struct.compression_type],PNG_COMPRESSION_TYPE_BASE |
6733 | IgorA | 1275 | jne @f ;if (..==0 && ..==..) |
1276 | stdcall png_image_size, edi |
||
1277 | stdcall optimize_cmf, edx, eax |
||
1278 | @@: |
||
1279 | end if |
||
1280 | |||
1281 | |||
1282 | or dword[edi+png_struct.mode],PNG_HAVE_IDAT |
||
1283 | |||
1284 | |||
1285 | mov [edi+png_struct.zstream.avail_out],ecx |
||
6797 | IgorA | 1286 | |
6733 | IgorA | 1287 | |
1288 | ; the same flush parameter until it has finished output, for NO_FLUSH |
||
1289 | ; it doesn't matter. |
||
1290 | |||
1291 | |||
1292 | jne .end2 |
||
1293 | cmp dword[flush],Z_NO_FLUSH |
||
1294 | jne .cycle0 ;if (..==.. && ..!=..) continue |
||
1295 | .end2: |
||
1296 | |||
1297 | |||
1298 | ; possible error might be detected if multiple things go wrong at once. |
||
1299 | |||
1300 | |||
1301 | jne .end3 ;if (..==..) ;most likely return code! |
||
1302 | ; If all the input has been consumed then just return. If Z_FINISH |
||
1303 | ; was used as the flush parameter something has gone wrong if we get |
||
1304 | ; here. |
||
1305 | |||
1306 | |||
1307 | jne .cycle0 ;if (..==0) |
||
1308 | cmp dword[flush],Z_FINISH |
||
1309 | jne .cycle0end ;if (..==..) |
||
1310 | png_error edi, 'Z_OK on Z_FINISH with output space' |
||
1311 | jmp .cycle0end |
||
1312 | .end3: |
||
1313 | cmp ebx,Z_STREAM_END |
||
1314 | jne .end4 |
||
1315 | cmp dword[flush],Z_FINISH |
||
1316 | jne .end4 ;else if (..==.. && ..==..) |
||
1317 | ; This is the end of the IDAT data; any pending output must be |
||
1318 | ; flushed. For small PNG files we may still be at the beginning. |
||
1319 | |||
1320 | |||
1321 | add edx,png_compression_buffer.output |
||
1322 | mov ecx,[edi+png_struct.zbuffer_size] |
||
1323 | mov eax,[edi+png_struct.zstream.avail_out] |
||
6797 | IgorA | 1324 | sub ecx,eax |
6780 | IgorA | 1325 | ;edx = data |
6733 | IgorA | 1326 | ;ecx = size |
1327 | |||
1328 | |||
1329 | mov eax,[edi+png_struct.mode] |
||
1330 | and eax,PNG_HAVE_IDAT |
||
1331 | jnz @f |
||
6780 | IgorA | 1332 | cmp byte[edi+png_struct.compression_type],PNG_COMPRESSION_TYPE_BASE |
6733 | IgorA | 1333 | jne @f ;if (..==0 && ..==..) |
1334 | stdcall png_image_size, edi |
||
1335 | stdcall optimize_cmf, edx, eax |
||
1336 | @@: |
||
1337 | end if |
||
1338 | stdcall png_write_complete_chunk, edi, png_IDAT, edx, ecx |
||
1339 | mov dword[edi+png_struct.zstream.avail_out],0 |
||
6797 | IgorA | 1340 | mov dword[edi+png_struct.zstream.next_out],0 |
6733 | IgorA | 1341 | or dword[edi+png_struct.mode], PNG_HAVE_IDAT or PNG_AFTER_IDAT |
1342 | |||
1343 | |||
1344 | jmp .cycle0end |
||
1345 | .end4: ;else |
||
1346 | ; This is an error condition. |
||
1347 | stdcall png_zstream_error, edi, ebx |
||
1348 | png_error edi, [edi+png_struct.zstream.msg] |
||
1349 | jmp .cycle0 |
||
1350 | .cycle0end: |
||
1351 | ret |
||
1352 | endp |
||
1353 | |||
1354 | |||
1355 | ;void (png_structrp png_ptr) |
||
1356 | align 4 |
||
1357 | proc png_write_IEND uses edi, png_ptr:dword |
||
1358 | png_debug 1, 'in png_write_IEND' |
||
1359 | |||
1360 | |||
1361 | stdcall png_write_complete_chunk, edi, png_IEND, 0, 0 |
||
1362 | or dword[edi+png_struct.mode], PNG_HAVE_IEND |
||
1363 | ret |
||
1364 | endp |
||
1365 | |||
1366 | |||
1367 | ;void (png_structrp png_ptr, png_fixed_point file_gamma) |
||
1368 | align 4 |
||
1369 | proc png_write_gAMA_fixed uses ebx, png_ptr:dword, file_gamma:dword |
||
1370 | locals |
||
1371 | buf rb 4 ;byte[4] |
||
1372 | endl |
||
1373 | png_debug 1, 'in png_write_gAMA' |
||
1374 | |||
1375 | |||
1376 | mov ebx,ebp |
||
1377 | sub ebx,4 |
||
1378 | stdcall png_save_uint_32 ,ebx, [file_gamma] |
||
1379 | stdcall png_write_complete_chunk, [png_ptr], png_gAMA, ebx, 4 |
||
1380 | ret |
||
1381 | endp |
||
1382 | |||
1383 | |||
1384 | ;void (png_structrp png_ptr, int srgb_intent) |
||
1385 | align 4 |
||
1386 | proc png_write_sRGB uses eax ebx, png_ptr:dword, srgb_intent:dword |
||
1387 | locals |
||
1388 | buf db ? ;byte[1] |
||
1389 | endl |
||
1390 | png_debug 1, 'in png_write_sRGB' |
||
1391 | |||
1392 | |||
1393 | jl @f |
||
1394 | png_warning [png_ptr], 'Invalid sRGB rendering intent specified' |
||
1395 | @@: |
||
1396 | |||
1397 | |||
1398 | mov ebx,ebp |
||
1399 | dec ebx |
||
1400 | mov byte[ebx],al ;buf[0]=(byte)srgb_intent |
||
1401 | stdcall png_write_complete_chunk, [png_ptr], png_sRGB, ebx, 1 |
||
1402 | ret |
||
1403 | endp |
||
1404 | |||
1405 | |||
1406 | ;void (png_structrp png_ptr, charp name, bytep profile) |
||
1407 | align 4 |
||
1408 | proc png_write_iCCP uses eax ebx ecx edi, png_ptr:dword, name:dword, profile:dword |
||
1409 | locals |
||
1410 | name_len dd ? ;uint_32 |
||
1411 | profile_len dd ? ;uint_32 |
||
1412 | temp dd ? ;uint_32 |
||
1413 | new_name rb 81 ;byte[81] ;1 byte for the compression byte |
||
1414 | comp compression_state |
||
1415 | endl |
||
1416 | png_debug 1, 'in png_write_iCCP' |
||
1417 | |||
1418 | |||
1419 | ; before when it was stored. |
||
1420 | |||
1421 | |||
1422 | cmp dword[profile],0 |
||
1423 | jne @f ;if (..==0) |
||
1424 | png_error edi, 'No profile for iCCP chunk' ;internal error |
||
1425 | @@: |
||
1426 | |||
1427 | |||
1428 | mov [profile_len],eax |
||
1429 | |||
1430 | |||
1431 | jge @f ;if (..<..) |
||
1432 | png_error edi, 'ICC profile too short' |
||
1433 | @@: |
||
1434 | |||
1435 | |||
1436 | ; if (temp > 3 && (profile_len & 0x03)) |
||
1437 | ; png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)"); |
||
1438 | |||
1439 | |||
1440 | ; uint_32 embedded_profile_len = png_get_uint_32(profile); |
||
1441 | |||
1442 | |||
1443 | ; png_error(png_ptr, "Profile length does not match profile"); |
||
1444 | ; } |
||
1445 | |||
1446 | |||
1447 | sub ebx,sizeof.compression_state |
||
1448 | mov ecx,ebx ;ecx = &comp |
||
1449 | sub ebx,81 ;ebx = &new_name |
||
1450 | stdcall png_check_keyword, edi, [name], ebx |
||
1451 | mov [name_len],eax |
||
1452 | |||
1453 | |||
1454 | jne @f ;if (..==0) |
||
1455 | png_error edi, 'iCCP: invalid keyword' |
||
1456 | @@: |
||
1457 | |||
1458 | |||
1459 | mov eax,[name_len] |
||
1460 | add eax,ebx |
||
1461 | mov byte[eax], PNG_COMPRESSION_TYPE_BASE |
||
1462 | |||
1463 | |||
1464 | inc dword[name_len] |
||
1465 | |||
1466 | |||
1467 | |||
1468 | |||
1469 | ; if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK) |
||
1470 | ; png_error(png_ptr, png_ptr->zstream.msg); |
||
1471 | |||
1472 | |||
1473 | |||
1474 | |||
1475 | |||
1476 | |||
1477 | |||
1478 | |||
1479 | ret |
||
1480 | endp |
||
1481 | |||
1482 | |||
1483 | ;void (png_structrp png_ptr, png_const_sPLT_tp spalette) |
||
1484 | align 4 |
||
1485 | proc png_write_sPLT, png_ptr:dword, spalette:dword |
||
1486 | ; uint_32 name_len; |
||
1487 | ; byte new_name[80]; |
||
1488 | ; byte entrybuf[10]; |
||
1489 | ; png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); |
||
1490 | ; png_size_t palette_size = entry_size * spalette->nentries; |
||
1491 | ; png_sPLT_entryp ep; |
||
1492 | if PNG_POINTER_INDEXING_SUPPORTED eq |
||
1493 | ; int i; |
||
1494 | end if |
||
1495 | |||
1496 | |||
1497 | |||
1498 | |||
1499 | |||
1500 | |||
1501 | ; png_error(png_ptr, "sPLT: invalid keyword"); |
||
1502 | |||
1503 | |||
1504 | ; png_write_chunk_header(png_ptr, png_sPLT, |
||
1505 | ; (uint_32)(name_len + 2 + palette_size)); |
||
1506 | |||
1507 | |||
1508 | ; (png_size_t)(name_len + 1)); |
||
1509 | |||
1510 | |||
1511 | |||
1512 | |||
1513 | if PNG_POINTER_INDEXING_SUPPORTED eq 1 |
||
1514 | ; for (ep = spalette->entries; ep |
||
1515 | ; { |
||
1516 | ; if (spalette->depth == 8) |
||
1517 | ; { |
||
1518 | ; entrybuf[0] = (byte)ep->red; |
||
1519 | ; entrybuf[1] = (byte)ep->green; |
||
1520 | ; entrybuf[2] = (byte)ep->blue; |
||
1521 | ; entrybuf[3] = (byte)ep->alpha; |
||
1522 | ; png_save_uint_16(entrybuf + 4, ep->frequency); |
||
1523 | ; } |
||
1524 | |||
1525 | |||
1526 | ; { |
||
1527 | ; png_save_uint_16(entrybuf + 0, ep->red); |
||
1528 | ; png_save_uint_16(entrybuf + 2, ep->green); |
||
1529 | ; png_save_uint_16(entrybuf + 4, ep->blue); |
||
1530 | ; png_save_uint_16(entrybuf + 6, ep->alpha); |
||
1531 | ; png_save_uint_16(entrybuf + 8, ep->frequency); |
||
1532 | ; } |
||
1533 | |||
1534 | |||
1535 | ; } |
||
1536 | else |
||
1537 | ; ep=spalette->entries; |
||
1538 | ; for (i = 0; i>spalette->nentries; i++) |
||
1539 | ; { |
||
1540 | ; if (spalette->depth == 8) |
||
1541 | ; { |
||
1542 | ; entrybuf[0] = (byte)ep[i].red; |
||
1543 | ; entrybuf[1] = (byte)ep[i].green; |
||
1544 | ; entrybuf[2] = (byte)ep[i].blue; |
||
1545 | ; entrybuf[3] = (byte)ep[i].alpha; |
||
1546 | ; png_save_uint_16(entrybuf + 4, ep[i].frequency); |
||
1547 | ; } |
||
1548 | |||
1549 | |||
1550 | ; { |
||
1551 | ; png_save_uint_16(entrybuf + 0, ep[i].red); |
||
1552 | ; png_save_uint_16(entrybuf + 2, ep[i].green); |
||
1553 | ; png_save_uint_16(entrybuf + 4, ep[i].blue); |
||
1554 | ; png_save_uint_16(entrybuf + 6, ep[i].alpha); |
||
1555 | ; png_save_uint_16(entrybuf + 8, ep[i].frequency); |
||
1556 | ; } |
||
1557 | |||
1558 | |||
1559 | ; } |
||
1560 | end if |
||
1561 | |||
1562 | |||
1563 | ret |
||
1564 | endp |
||
1565 | |||
1566 | |||
1567 | ;void (png_structrp png_ptr, png_const_color_8p sbit, int color_type) |
||
1568 | align 4 |
||
1569 | proc png_write_sBIT uses eax edi, png_ptr:dword, sbit:dword, color_type:dword |
||
1570 | locals |
||
1571 | size dd ? ;png_size_t |
||
1572 | buf rb 4 ;byte[4] |
||
1573 | endl |
||
1574 | png_debug 1, 'in png_write_sBIT' |
||
1575 | |||
1576 | |||
1577 | ; if ((color_type & PNG_COLOR_MASK_COLOR) != 0) |
||
1578 | ; { |
||
1579 | ; byte maxbits; |
||
1580 | |||
1581 | |||
1582 | ; png_ptr->usr_bit_depth); |
||
1583 | |||
1584 | |||
1585 | ; sbit->green == 0 || sbit->green > maxbits || |
||
1586 | ; sbit->blue == 0 || sbit->blue > maxbits) |
||
1587 | ; { |
||
1588 | ; png_warning(png_ptr, "Invalid sBIT depth specified"); |
||
1589 | ; return; |
||
1590 | ; } |
||
1591 | |||
1592 | |||
1593 | ; buf[1] = sbit->green; |
||
1594 | ; buf[2] = sbit->blue; |
||
1595 | ; size = 3; |
||
1596 | ; } |
||
1597 | |||
1598 | |||
1599 | ; { |
||
1600 | ; if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) |
||
1601 | ; { |
||
1602 | ; png_warning(png_ptr, "Invalid sBIT depth specified"); |
||
1603 | ; return; |
||
1604 | ; } |
||
1605 | |||
1606 | |||
1607 | ; size = 1; |
||
1608 | ; } |
||
1609 | |||
1610 | |||
1611 | ; { |
||
1612 | ; if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) |
||
1613 | ; { |
||
1614 | ; png_warning(png_ptr, "Invalid sBIT depth specified"); |
||
1615 | ; return; |
||
1616 | ; } |
||
1617 | |||
1618 | |||
1619 | ; } |
||
1620 | |||
1621 | |||
1622 | .end_f: |
||
1623 | ret |
||
1624 | endp |
||
1625 | |||
1626 | |||
1627 | ;void (png_structrp png_ptr, const png_xy *xy) |
||
1628 | align 4 |
||
1629 | proc png_write_cHRM_fixed uses eax ebx, png_ptr:dword, xy:dword |
||
1630 | locals |
||
1631 | buf rb 32 ;byte[32] |
||
1632 | endl |
||
1633 | png_debug 1, 'in png_write_cHRM' |
||
1634 | |||
1635 | |||
1636 | mov eax,[xy] |
||
1637 | mov ebx,ebp |
||
1638 | sub ebx,32 |
||
1639 | ; png_save_int_32(buf, xy->whitex); |
||
1640 | ; png_save_int_32(buf + 4, xy->whitey); |
||
1641 | |||
1642 | |||
1643 | ; png_save_int_32(buf + 12, xy->redy); |
||
1644 | |||
1645 | |||
1646 | ; png_save_int_32(buf + 20, xy->greeny); |
||
1647 | |||
1648 | |||
1649 | ; png_save_int_32(buf + 28, xy->bluey); |
||
1650 | |||
1651 | |||
1652 | ret |
||
1653 | endp |
||
1654 | |||
1655 | |||
1656 | ;void (png_structrp png_ptr, bytep trans_alpha, png_color_16p tran, int num_trans, int color_type) |
||
1657 | align 4 |
||
1658 | proc png_write_tRNS uses eax ebx ecx edi, png_ptr:dword, trans_alpha:dword, tran:dword, num_trans:dword, color_type:dword |
||
1659 | locals |
||
1660 | buf rb 6 ;byte[6] |
||
1661 | endl |
||
1662 | png_debug 1, 'in png_write_tRNS' |
||
1663 | |||
1664 | |||
1665 | cmp byte[color_type],PNG_COLOR_TYPE_PALETTE |
||
1666 | jne .end0 ;if (..==..) |
||
1667 | cmp dword[num_trans],0 |
||
1668 | jle @f |
||
1669 | movzx eax,word[edi+png_struct.num_palette] |
||
1670 | cmp [num_trans],eax |
||
1671 | jle .end1 |
||
1672 | @@: ;if (..<=0 || ..>..) |
||
1673 | png_app_warning edi, 'Invalid number of transparent colors specified' |
||
1674 | jmp .end_f |
||
1675 | .end1: |
||
1676 | |||
1677 | |||
1678 | stdcall png_write_complete_chunk, edi, png_tRNS, [trans_alpha], [num_trans] |
||
1679 | jmp .end_f |
||
1680 | .end0: |
||
1681 | |||
1682 | |||
1683 | jne .end2 ;else if (..==..) |
||
1684 | ; One 16-bit value |
||
1685 | mov cl,[edi+png_struct.bit_depth] |
||
1686 | xor eax,eax |
||
1687 | inc eax |
||
1688 | shl eax,cl |
||
1689 | mov ecx,[tran] |
||
1690 | cmp word[ecx+png_color_16.gray],ax |
||
1691 | jl @f ;if (..>=..) |
||
1692 | png_app_warning edi, 'Ignoring attempt to write tRNS chunk out-of-range for bit_depth' |
||
1693 | jmp .end_f |
||
1694 | @@: |
||
1695 | movzx eax,word[ecx+png_color_16.gray] |
||
1696 | mov ebx,ebp |
||
1697 | sub ebx,6 |
||
1698 | stdcall png_save_uint_16, ebx, eax |
||
1699 | stdcall png_write_complete_chunk, edi, png_tRNS, ebx, 2 |
||
1700 | jmp .end_f |
||
1701 | .end2: |
||
1702 | |||
1703 | |||
1704 | jne .end3 ;else if (..== ..) |
||
1705 | ; Three 16-bit values |
||
1706 | mov ebx,ebp |
||
1707 | sub ebx,6 |
||
1708 | mov ecx,[tran] |
||
1709 | movzx eax,word[ecx+png_color_16.red] |
||
1710 | stdcall png_save_uint_16, ebx, eax |
||
1711 | add ebx,2 |
||
1712 | movzx eax,word[ecx+png_color_16.green] |
||
1713 | stdcall png_save_uint_16, ebx, eax |
||
1714 | add ebx,2 |
||
1715 | movzx eax,word[ecx+png_color_16.blue] |
||
1716 | stdcall png_save_uint_16, ebx, eax |
||
1717 | sub ebx,4 |
||
1718 | if PNG_WRITE_16BIT_SUPPORTED eq 1 |
||
1719 | cmp byte[edi+png_struct.bit_depth],8 |
||
1720 | jne @f ;if (..==.. && ... |
||
1721 | end if |
||
1722 | mov al,[ebx] |
||
1723 | or al,[ebx+2] |
||
1724 | or al,[ebx+4] |
||
1725 | cmp al,0 |
||
1726 | je @f ;if (..|..|..!=0) |
||
1727 | png_app_warning edi, 'Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8' |
||
1728 | jmp .end_f |
||
1729 | @@: |
||
1730 | stdcall png_write_complete_chunk, edi, png_tRNS, ebx, 6 |
||
1731 | jmp .end_f |
||
1732 | .end3: ;else |
||
1733 | cStr ,<'Can',39,'t write tRNS with an alpha channel'> |
||
1734 | png_app_warning edi, eax |
||
1735 | .end_f: |
||
1736 | ret |
||
1737 | endp |
||
1738 | |||
1739 | |||
1740 | ;void (png_structrp png_ptr, png_const_color_16p back, int color_type) |
||
1741 | align 4 |
||
1742 | proc png_write_bKGD, png_ptr:dword, back:dword, color_type:dword |
||
1743 | locals |
||
1744 | buf rb 6 ;byte[6] |
||
1745 | endl |
||
1746 | png_debug 1, 'in png_write_bKGD' |
||
1747 | |||
1748 | |||
1749 | ; { |
||
1750 | ; if ( |
||
1751 | if PNG_MNG_FEATURES_SUPPORTED eq 1 |
||
1752 | ; (png_ptr->num_palette != 0 || |
||
1753 | ; (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0) && |
||
1754 | end if |
||
1755 | ; back->index >= png_ptr->num_palette) |
||
1756 | ; { |
||
1757 | ; png_warning(png_ptr, "Invalid background palette index"); |
||
1758 | ; return; |
||
1759 | ; } |
||
1760 | |||
1761 | |||
1762 | ; png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1); |
||
1763 | ; } |
||
1764 | |||
1765 | |||
1766 | ; { |
||
1767 | ; png_save_uint_16(buf, back->red); |
||
1768 | ; png_save_uint_16(buf + 2, back->green); |
||
1769 | ; png_save_uint_16(buf + 4, back->blue); |
||
1770 | if PNG_WRITE_16BIT_SUPPORTED eq 1 |
||
1771 | ; if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0) |
||
1772 | else |
||
1773 | ; if ((buf[0] | buf[2] | buf[4]) != 0) |
||
1774 | end if |
||
1775 | ; { |
||
1776 | ; png_warning(png_ptr, |
||
1777 | ; "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); |
||
1778 | |||
1779 | |||
1780 | ; } |
||
1781 | |||
1782 | |||
1783 | ; } |
||
1784 | |||
1785 | |||
1786 | ; { |
||
1787 | ; if (back->gray >= (1 << png_ptr->bit_depth)) |
||
1788 | ; { |
||
1789 | ; png_warning(png_ptr, |
||
1790 | ; "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); |
||
1791 | |||
1792 | |||
1793 | ; } |
||
1794 | |||
1795 | |||
1796 | ; png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2); |
||
1797 | ; } |
||
1798 | ret |
||
1799 | endp |
||
1800 | |||
1801 | |||
1802 | ;void (png_structrp png_ptr, png_const_uint_16p hist, int num_hist) |
||
1803 | align 4 |
||
1804 | proc png_write_hIST, png_ptr:dword, hist:dword, num_hist:dword |
||
1805 | locals |
||
1806 | i dd ? ;int |
||
1807 | buf rb 3 ;byte[3] |
||
1808 | endl |
||
1809 | png_debug 1, 'in png_write_hIST' |
||
1810 | pushad |
||
1811 | |||
1812 | |||
1813 | movzx eax,word[edi+png_struct.num_palette] |
||
1814 | cmp [num_hist],eax |
||
1815 | jle @f ;if (..>..) |
||
1816 | ; png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, |
||
1817 | ; png_ptr->num_palette); |
||
1818 | |||
1819 | |||
1820 | jmp .end_f |
||
1821 | @@: |
||
1822 | |||
1823 | |||
1824 | shl eax,1 |
||
1825 | stdcall png_write_chunk_header, edi, png_hIST, eax |
||
1826 | |||
1827 | |||
1828 | ; { |
||
1829 | ; png_save_uint_16(buf, hist[i]); |
||
1830 | ; png_write_chunk_data(png_ptr, buf, (png_size_t)2); |
||
1831 | ; } |
||
1832 | |||
1833 | |||
1834 | .end_f: |
||
1835 | popad |
||
1836 | ret |
||
1837 | endp |
||
1838 | |||
1839 | |||
1840 | ;void (png_structrp png_ptr, charp key, charp text, png_size_t text_len) |
||
1841 | align 4 |
||
1842 | proc png_write_tEXt uses eax edi, png_ptr:dword, key:dword, text:dword, text_len:dword |
||
1843 | locals |
||
1844 | key_len dd ? ;uint_32 |
||
1845 | new_key rb 80 ;byte[80] |
||
1846 | endl |
||
1847 | png_debug 1, 'in png_write_tEXt' |
||
1848 | |||
1849 | |||
1850 | |||
1851 | |||
1852 | ; png_error(png_ptr, "tEXt: invalid keyword"); |
||
1853 | |||
1854 | |||
1855 | ; text_len = 0; |
||
1856 | |||
1857 | |||
1858 | ; text_len = strlen(text); |
||
1859 | |||
1860 | |||
1861 | ; png_error(png_ptr, "tEXt: text too long"); |
||
1862 | |||
1863 | |||
1864 | ; png_write_chunk_header(png_ptr, png_tEXt, |
||
1865 | ; (uint_32)/*checked above*/(key_len + text_len + 1)); |
||
1866 | |||
1867 | |||
1868 | ; contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
||
1869 | ; any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. |
||
1870 | ; The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
||
1871 | |||
1872 | |||
1873 | |||
1874 | |||
1875 | ; png_write_chunk_data(png_ptr, (bytep)text, text_len); |
||
1876 | |||
1877 | |||
1878 | ret |
||
1879 | endp |
||
1880 | |||
1881 | |||
1882 | ; Write a compressed text chunk |
||
1883 | ;void (png_structrp png_ptr, charp key, charp text, int compression) |
||
1884 | align 4 |
||
1885 | proc png_write_zTXt uses eax edi, png_ptr:dword, key:dword, text:dword, compression:dword |
||
1886 | locals |
||
1887 | key_len dd ? ;uint_32 |
||
1888 | new_key rb 81 ;byte[81] |
||
1889 | comp compression_state |
||
1890 | endl |
||
1891 | png_debug 1, 'in png_write_zTXt' |
||
1892 | |||
1893 | |||
1894 | cmp dword[compression],PNG_TEXT_COMPRESSION_NONE |
||
1895 | jne @f ;if (..==..) |
||
1896 | stdcall png_write_tEXt, edi, [key], [text], 0 |
||
1897 | jmp .end_f |
||
1898 | @@: |
||
1899 | |||
1900 | |||
1901 | ; png_error(png_ptr, "zTXt: invalid compression type"); |
||
1902 | |||
1903 | |||
1904 | |||
1905 | |||
1906 | ; png_error(png_ptr, "zTXt: invalid keyword"); |
||
1907 | |||
1908 | |||
1909 | ; new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
||
1910 | ; ++key_len; |
||
1911 | |||
1912 | |||
1913 | ; png_text_compress_init(&comp, (bytep)text, |
||
1914 | ; text == NULL ? 0 : strlen(text)); |
||
1915 | |||
1916 | |||
1917 | ; png_error(png_ptr, png_ptr->zstream.msg); |
||
1918 | |||
1919 | |||
1920 | ; png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len); |
||
1921 | |||
1922 | |||
1923 | ; png_write_chunk_data(png_ptr, new_key, key_len); |
||
1924 | |||
1925 | |||
1926 | ; png_write_compressed_data_out(png_ptr, &comp); |
||
1927 | |||
1928 | |||
1929 | stdcall png_write_chunk_end, edi |
||
1930 | .end_f: |
||
1931 | ret |
||
1932 | endp |
||
1933 | end if |
||
1934 | |||
1935 | |||
1936 | ; Write an iTXt chunk |
||
1937 | ;void (png_structrp png_ptr, int compression, charp key, |
||
1938 | ; charp lang, charp lang_key, charp text) |
||
1939 | align 4 |
||
1940 | proc png_write_iTXt, png_ptr:dword, compression:dword, key:dword, lang:dword, lang_key:dword, text:dword |
||
1941 | locals |
||
1942 | key_len dd ? ;uint_32 |
||
1943 | prefix_len dd ? |
||
1944 | ;png_size_t lang_len, lang_key_len; |
||
1945 | new_key rb 82 ;byte[82] |
||
1946 | comp compression_state |
||
1947 | endl |
||
1948 | |||
1949 | |||
1950 | pushad |
||
1951 | mov edi,[png_ptr] |
||
1952 | mov ebx,ebp |
||
1953 | sub ebx,82+sizeof.compression_state |
||
1954 | stdcall png_check_keyword, edi, [key], ebx |
||
1955 | mov [key_len],eax |
||
1956 | |||
1957 | |||
1958 | jne @f ;if (..==0) |
||
1959 | png_error edi, 'iTXt: invalid keyword' |
||
1960 | @@: |
||
1961 | |||
1962 | |||
1963 | ; switch (compression) |
||
1964 | ; { |
||
1965 | ; case PNG_ITXT_COMPRESSION_NONE: |
||
1966 | ; case PNG_TEXT_COMPRESSION_NONE: |
||
1967 | ; compression = new_key[++key_len] = 0; /* no compression */ |
||
1968 | ; break; |
||
1969 | |||
1970 | |||
1971 | ; case PNG_ITXT_COMPRESSION_zTXt: |
||
1972 | ; compression = new_key[++key_len] = 1; /* compressed */ |
||
1973 | ; break; |
||
1974 | |||
1975 | |||
1976 | ; png_error(png_ptr, "iTXt: invalid compression"); |
||
1977 | ; } |
||
1978 | |||
1979 | |||
1980 | ; ++key_len; /* for the keywod separator */ |
||
1981 | |||
1982 | |||
1983 | ; contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
||
1984 | ; any non-Latin-1 characters except for NEWLINE. ISO PNG, however, |
||
1985 | ; specifies that the text is UTF-8 and this really doesn't require any |
||
1986 | ; checking. |
||
1987 | |||
1988 | |||
1989 | |||
1990 | |||
1991 | |||
1992 | |||
1993 | ; lang_len = strlen(lang)+1; |
||
1994 | ; if (lang_key == NULL) lang_key = ""; /* may be empty */ |
||
1995 | ; lang_key_len = strlen(lang_key)+1; |
||
1996 | ; if (text == NULL) text = ""; /* may be empty */ |
||
1997 | |||
1998 | |||
1999 | mov [prefix_len],eax |
||
2000 | ; if (lang_len > PNG_UINT_31_MAX-prefix_len) |
||
2001 | ; prefix_len = PNG_UINT_31_MAX; |
||
2002 | ; else |
||
2003 | ; prefix_len = (uint_32)(prefix_len + lang_len); |
||
2004 | |||
2005 | |||
2006 | ; prefix_len = PNG_UINT_31_MAX; |
||
2007 | ; else |
||
2008 | ; prefix_len = (uint_32)(prefix_len + lang_key_len); |
||
2009 | |||
2010 | |||
2011 | |||
2012 | |||
2013 | ; { |
||
2014 | ; if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK) |
||
2015 | ; png_error(png_ptr, png_ptr->zstream.msg); |
||
2016 | ; } |
||
2017 | |||
2018 | |||
2019 | ; { |
||
2020 | ; if (comp.input_len > PNG_UINT_31_MAX-prefix_len) |
||
2021 | ; png_error(png_ptr, "iTXt: uncompressed text too long"); |
||
2022 | |||
2023 | |||
2024 | ; comp.output_len = (uint_32)/*SAFE*/comp.input_len; |
||
2025 | ; } |
||
2026 | |||
2027 | |||
2028 | |||
2029 | |||
2030 | |||
2031 | |||
2032 | |||
2033 | |||
2034 | |||
2035 | |||
2036 | ; png_write_compressed_data_out(png_ptr, &comp); |
||
2037 | |||
2038 | |||
2039 | ; png_write_chunk_data(png_ptr, (bytep)text, comp.output_len); |
||
2040 | |||
2041 | |||
2042 | popad |
||
2043 | ret |
||
2044 | endp |
||
2045 | end if |
||
2046 | |||
2047 | |||
2048 | ;void (png_structrp png_ptr, int_32 x_offset, int_32 y_offset, int unit_type) |
||
2049 | align 4 |
||
2050 | proc png_write_oFFs uses eax ebx edi, png_ptr:dword, x_offset:dword, y_offset:dword, unit_type:dword |
||
2051 | locals |
||
2052 | buf rb 9 ;byte[9] |
||
2053 | endl |
||
2054 | png_debug 1, 'in png_write_oFFs' |
||
2055 | |||
2056 | |||
2057 | cmp dword[unit_type],PNG_OFFSET_LAST |
||
2058 | jl @f ;if (..>=..) |
||
2059 | png_warning edi, 'Unrecognized unit type for oFFs chunk' |
||
2060 | @@: |
||
2061 | |||
2062 | |||
2063 | sub ebx,9 |
||
2064 | stdcall png_save_int_32, ebx, [x_offset] |
||
2065 | add ebx,4 |
||
2066 | stdcall png_save_int_32, ebx, [y_offset] |
||
2067 | add ebx,4 |
||
2068 | mov eax,[unit_type] |
||
2069 | mov [ebx],al |
||
2070 | sub ebx,8 |
||
2071 | |||
2072 | |||
2073 | ret |
||
2074 | endp |
||
2075 | |||
2076 | |||
2077 | ;void (png_structrp png_ptr, charp purpose, int_32 X0, |
||
2078 | ; int_32 X1, int type, int nparams, charp units, charpp params) |
||
2079 | align 4 |
||
2080 | proc png_write_pCAL, png_ptr:dword, purpose:dword, X0:dword, X1:dword, type:dword,\ |
||
2081 | nparams:dword, units:dword, params:dword |
||
2082 | locals |
||
2083 | purpose_len dd ? ;uint_32 |
||
2084 | units_len dd ? |
||
2085 | total_len dd ? ;png_size_t |
||
2086 | params_len dd ? ;png_size_tp |
||
2087 | buf rb 10 ;byte[10] |
||
2088 | new_purpose rb 80 ;byte[80] |
||
2089 | i dd ? ;int |
||
2090 | endl |
||
2091 | pushad |
||
2092 | png_debug1 1, 'in png_write_pCAL (%d parameters)', [nparams] |
||
2093 | mov edi,[png_ptr] |
||
2094 | |||
2095 | |||
2096 | jl @f ;if (..>=..) |
||
2097 | png_error edi, 'Unrecognized equation type for pCAL chunk' |
||
2098 | @@: |
||
2099 | |||
2100 | |||
2101 | sub ebx,84 ;ebx = &new_purpose |
||
2102 | stdcall png_check_keyword, edi, [purpose], ebx |
||
2103 | mov [purpose_len],eax |
||
2104 | |||
2105 | |||
2106 | jne @f ;if(..==0) |
||
2107 | png_error edi, 'pCAL: invalid keyword' |
||
2108 | @@: |
||
2109 | |||
2110 | |||
2111 | |||
2112 | |||
2113 | ; units_len = strlen(units) + (nparams == 0 ? 0 : 1); |
||
2114 | png_debug1 3, 'pCAL units length = %d', [units_len] |
||
2115 | ; total_len = purpose_len + units_len + 10; |
||
2116 | |||
2117 | |||
2118 | ; (png_alloc_size_t)(nparams * (sizeof (png_size_t)))); |
||
2119 | |||
2120 | |||
2121 | ; null terminator for the last parameter. |
||
2122 | |||
2123 | |||
2124 | ; { |
||
2125 | ; params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1); |
||
2126 | ; png_debug2(3, "pCAL parameter %d length = %lu", i, |
||
2127 | ; (unsigned long)params_len[i]); |
||
2128 | ; total_len += params_len[i]; |
||
2129 | ; } |
||
2130 | |||
2131 | |||
2132 | stdcall png_write_chunk_header, edi, png_pCAL, [total_len] |
||
2133 | stdcall png_write_chunk_data, edi, ebx, [purpose_len] |
||
2134 | mov ebx,ebp |
||
2135 | sub ebx,94 ;ebx = &buf |
||
2136 | stdcall png_save_int_32, ebx, [X0] |
||
2137 | add ebx,4 |
||
2138 | stdcall png_save_int_32, ebx, [X1] |
||
2139 | add ebx,4 |
||
2140 | mov eax,[type] |
||
2141 | mov [ebx],al |
||
2142 | inc ebx |
||
2143 | mov eax,[nparams] |
||
2144 | mov [ebx],al |
||
2145 | sub ebx,9 |
||
2146 | stdcall png_write_chunk_data, edi, ebx, 10 |
||
2147 | stdcall png_write_chunk_data, edi, [units], [units_len] |
||
2148 | |||
2149 | |||
2150 | ; { |
||
2151 | ; png_write_chunk_data(png_ptr, (bytep)params[i], params_len[i]); |
||
2152 | ; } |
||
2153 | |||
2154 | |||
2155 | stdcall png_write_chunk_end, edi |
||
2156 | popad |
||
2157 | ret |
||
2158 | endp |
||
2159 | |||
2160 | |||
2161 | ;void (png_structrp png_ptr, int unit, charp width, charp height) |
||
2162 | align 4 |
||
2163 | proc png_write_sCAL_s uses eax ebx ecx edi esi, png_ptr:dword, unit:dword, width:dword, height:dword |
||
2164 | locals |
||
2165 | total_len dd 2 |
||
2166 | wlen dd ? |
||
2167 | hlen dd ? |
||
2168 | buf rb 64 ;byte[64] |
||
2169 | endl |
||
2170 | png_debug 1, 'in png_write_sCAL_s' |
||
2171 | |||
2172 | |||
2173 | add [total_len],eax |
||
2174 | mov [wlen],eax |
||
2175 | stdcall strlen,[height] |
||
2176 | add [total_len],eax |
||
2177 | mov [hlen],eax |
||
2178 | |||
2179 | |||
2180 | jle @f ;if (..>..) |
||
2181 | cStr ,<'Can',39,'t write sCAL (buffer too small)'> |
||
2182 | png_warning [png_ptr], eax |
||
2183 | jmp .end_f |
||
2184 | @@: |
||
2185 | |||
2186 | |||
2187 | sub ebx,64 |
||
2188 | mov eax,[unit] |
||
2189 | mov byte[ebx],al |
||
2190 | mov ecx,[wlen] |
||
2191 | inc ecx |
||
2192 | mov edi,ebx |
||
2193 | inc edi |
||
2194 | mov esi,[width] |
||
2195 | rep movsb ;Append the '\0' here |
||
2196 | mov ecx,[hlen] |
||
2197 | mov esi,[height] |
||
2198 | rep movsb ;Do NOT append the '\0' here |
||
2199 | |||
2200 | |||
2201 | stdcall png_write_complete_chunk, [png_ptr], png_sCAL, ebx, [total_len] |
||
2202 | .end_f: |
||
2203 | ret |
||
2204 | endp |
||
2205 | |||
2206 | |||
2207 | ;void (png_structrp png_ptr, uint_32 x_pixels_per_unit, |
||
2208 | ; uint_32 y_pixels_per_unit, int unit_type) |
||
2209 | align 4 |
||
2210 | proc png_write_pHYs uses eax ebx, png_ptr:dword, x_pixels_per_unit:dword, y_pixels_per_unit:dword, unit_type:dword |
||
2211 | locals |
||
2212 | buf rb 9 ;byte[9] |
||
2213 | endl |
||
2214 | png_debug 1, 'in png_write_pHYs' |
||
2215 | |||
2216 | |||
2217 | jl @f ;if (..>=..) |
||
2218 | png_warning [png_ptr], 'Unrecognized unit type for pHYs chunk' |
||
2219 | @@: |
||
2220 | |||
2221 | |||
2222 | sub ebx,9 |
||
2223 | stdcall png_save_uint_32, ebx, [x_pixels_per_unit] |
||
2224 | add ebx,4 |
||
2225 | stdcall png_save_uint_32, ebx, [y_pixels_per_unit] |
||
2226 | add ebx,4 |
||
2227 | mov al,byte[unit_type] |
||
2228 | mov byte[ebx],al |
||
2229 | sub ebx,8 |
||
2230 | |||
2231 | |||
2232 | ret |
||
2233 | endp |
||
2234 | |||
2235 | |||
2236 | ; or png_convert_from_time_t(), or fill in the structure yourself. |
||
2237 | |||
2238 | |||
2239 | align 4 |
||
2240 | proc png_write_tIME uses eax ebx ecx, png_ptr:dword, mod_time:dword |
||
2241 | locals |
||
2242 | buf rb 7 ;byte[7] |
||
2243 | endl |
||
2244 | png_debug 1, 'in png_write_tIME' |
||
2245 | |||
2246 | |||
2247 | mov cl,[eax+png_time.month] |
||
2248 | cmp cl,12 |
||
2249 | jg @f |
||
2250 | cmp cl,1 |
||
2251 | jl @f |
||
2252 | mov ch,[eax+png_time.day] |
||
2253 | cmp ch,31 |
||
2254 | jg @f |
||
2255 | cmp ch,1 |
||
2256 | jl @f |
||
2257 | cmp byte[eax+png_time.hour],23 |
||
2258 | jg @f |
||
2259 | cmp byte[eax+png_time.second],60 |
||
2260 | jg @f |
||
2261 | jmp .end0 |
||
2262 | @@: |
||
2263 | png_warning [png_ptr], 'Invalid time specified for tIME chunk' |
||
2264 | jmp .end_f |
||
2265 | .end0: |
||
2266 | |||
2267 | |||
2268 | push ebx |
||
2269 | mov ebx,ebp |
||
2270 | sub ebx,7 |
||
2271 | stdcall png_save_uint_16, ebx ;, year |
||
2272 | add ebx,2 |
||
2273 | mov byte[ebx],cl ;month |
||
2274 | inc ebx |
||
2275 | mov byte[ebx],ch ;day |
||
2276 | inc ebx |
||
2277 | mov cl,[eax+png_time.hour] |
||
2278 | mov byte[ebx],cl ;hour |
||
2279 | inc ebx |
||
2280 | mov cl,[eax+png_time.minute] |
||
2281 | mov byte[ebx],cl ;minute |
||
2282 | inc ebx |
||
2283 | mov cl,[eax+png_time.second] |
||
2284 | mov byte[ebx],cl ;second |
||
2285 | sub ebx,6 |
||
2286 | |||
2287 | |||
2288 | .end_f: |
||
2289 | ret |
||
2290 | endp |
||
2291 | |||
2292 | |||
2293 | ; Arrays to facilitate easy interlacing - use pass (0 - 6) as index |
||
2294 | |||
2295 | |||
2296 | png_pass_start db 0, 4, 0, 2, 0, 1, 0 |
||
2297 | ; Offset to next interlace block |
||
2298 | png_pass_inc db 8, 8, 4, 4, 2, 2, 1 |
||
2299 | ; Start of interlace block in the y direction |
||
2300 | png_pass_ystart db 0, 0, 4, 0, 2, 0, 1 |
||
2301 | ; Offset to next interlace block in the y direction |
||
2302 | png_pass_yinc db 8, 8, 8, 4, 4, 2, 2 |
||
2303 | end if |
||
2304 | |||
2305 | |||
2306 | ;void (png_structrp png_ptr) |
||
2307 | align 4 |
||
2308 | proc png_write_start_row uses eax ebx ecx edx edi, png_ptr:dword |
||
2309 | locals |
||
2310 | buf_size dd ? ;png_alloc_size_t |
||
2311 | usr_pixel_depth dd ? ;int |
||
2312 | if PNG_WRITE_FILTER_SUPPORTED eq 1 |
||
2313 | filters db ? ;byte |
||
2314 | end if |
||
2315 | endl |
||
2316 | png_debug 1, 'in png_write_start_row' |
||
2317 | |||
2318 | |||
2319 | movzx eax,byte[edi+png_struct.usr_channels] |
||
2320 | movzx ebx,byte[edi+png_struct.usr_bit_depth] |
||
2321 | imul eax,ebx |
||
2322 | mov [usr_pixel_depth],eax |
||
2323 | PNG_ROWBYTES eax,[edi+png_struct.width] |
||
2324 | inc eax |
||
2325 | mov [buf_size],eax |
||
2326 | |||
2327 | |||
2328 | mov al,[edi+png_struct.pixel_depth] |
||
2329 | mov [edi+png_struct.transformed_pixel_depth],al |
||
2330 | |||
2331 | |||
2332 | mov [edi+png_struct.maximum_pixel_depth],al |
||
2333 | |||
2334 | |||
2335 | stdcall png_malloc, edi, [buf_size] |
||
2336 | mov [edi+png_struct.row_buf],eax |
||
2337 | |||
2338 | |||
2339 | |||
2340 | |||
2341 | mov al,byte[edi+png_struct.do_filter] |
||
2342 | |||
2343 | |||
2344 | jne @f ;if (..==1) |
||
2345 | and al, 0xff and not(PNG_FILTER_UP or PNG_FILTER_AVG or PNG_FILTER_PAETH) |
||
2346 | @@: |
||
2347 | cmp dword[edi+png_struct.width],1 |
||
2348 | jne @f ;if (..==1) |
||
2349 | and al, 0xff and not(PNG_FILTER_SUB or PNG_FILTER_AVG or PNG_FILTER_PAETH) |
||
2350 | @@: |
||
2351 | |||
2352 | |||
2353 | jne @f ;if (..==0) |
||
2354 | mov al,PNG_FILTER_NONE |
||
2355 | @@: |
||
2356 | |||
2357 | |||
2358 | mov byte[edi+png_struct.do_filter],al |
||
2359 | |||
2360 | |||
2361 | and al,PNG_FILTER_SUB or PNG_FILTER_UP or PNG_FILTER_AVG or PNG_FILTER_PAETH |
||
2362 | cmp al,0 |
||
2363 | je .end0 |
||
2364 | cmp dword[edi+png_struct.try_row],0 |
||
2365 | jne .end0 ;if (..!=0) && ..==0) |
||
2366 | xor ebx,ebx |
||
2367 | |||
2368 | |||
2369 | mov dword[edi+png_struct.try_row],eax |
||
2370 | |||
2371 | |||
2372 | and al,PNG_FILTER_SUB |
||
2373 | cmp al,0 |
||
2374 | je @f |
||
2375 | inc ebx |
||
2376 | @@: |
||
2377 | mov al,[filters] |
||
2378 | and al,PNG_FILTER_UP |
||
2379 | cmp al,0 |
||
2380 | je @f |
||
2381 | inc ebx |
||
2382 | @@: |
||
2383 | mov al,[filters] |
||
2384 | and al,PNG_FILTER_AVG |
||
2385 | cmp al,0 |
||
2386 | je @f |
||
2387 | inc ebx |
||
2388 | @@: |
||
2389 | mov al,[filters] |
||
2390 | and al,PNG_FILTER_PAETH |
||
2391 | cmp al,0 |
||
2392 | je @f |
||
2393 | inc ebx |
||
2394 | @@: |
||
2395 | cmp ebx,1 |
||
2396 | jle .end0 ;if (..>1) |
||
2397 | stdcall png_malloc, edi, [buf_size] |
||
2398 | mov dword[edi+png_struct.tst_row],eax |
||
2399 | .end0: |
||
2400 | |||
2401 | |||
2402 | ; filters. |
||
2403 | |||
2404 | |||
2405 | and al,PNG_FILTER_AVG or PNG_FILTER_UP or PNG_FILTER_PAETH |
||
2406 | cmp al,0 |
||
2407 | je @f ;if (..!=0) |
||
2408 | stdcall png_calloc, edi, [buf_size] |
||
2409 | mov dword[edi+png_struct.prev_row],eax |
||
2410 | @@: |
||
2411 | end if ;WRITE_FILTER |
||
2412 | |||
2413 | |||
2414 | ; If interlaced, we need to set up width and height of pass |
||
2415 | cmp byte[edi+png_struct.interlaced],0 |
||
2416 | je @f |
||
2417 | mov eax,[edi+png_struct.transformations] |
||
2418 | and eax,PNG_INTERLACE |
||
2419 | jnz @f ;if(..!=0 && ..==0) |
||
6780 | IgorA | 2420 | movzx ecx,byte[png_pass_yinc] |
6733 | IgorA | 2421 | mov eax,[edi+png_struct.height] |
2422 | add eax,ecx |
||
2423 | dec eax |
||
2424 | movzx edx,byte[png_pass_ystart] |
||
2425 | sub eax,edx |
||
2426 | xor edx,edx |
||
2427 | div ecx |
||
2428 | mov [edi+png_struct.num_rows],eax |
||
2429 | |||
2430 | |||
2431 | mov eax,[edi+png_struct.width] |
||
2432 | add eax,ecx |
||
2433 | dec eax |
||
2434 | movzx edx,byte[png_pass_start] |
||
2435 | sub eax,edx |
||
2436 | xor edx,edx |
||
2437 | div ecx |
||
2438 | mov [edi+png_struct.usr_width],eax |
||
2439 | jmp .end1 |
||
2440 | @@: ;else |
||
2441 | end if |
||
2442 | mov eax,[edi+png_struct.height] |
||
2443 | mov [edi+png_struct.num_rows],eax |
||
2444 | mov eax,[edi+png_struct.width] |
||
2445 | mov [edi+png_struct.usr_width],eax |
||
2446 | .end1: |
||
2447 | ret |
||
2448 | endp |
||
2449 | |||
2450 | |||
2451 | ;void (png_structrp png_ptr) |
||
2452 | align 4 |
||
2453 | proc png_write_finish_row uses eax ecx edx edi, png_ptr:dword |
||
2454 | png_debug 1, 'in png_write_finish_row' |
||
2455 | |||
2456 | |||
2457 | ; Next row |
||
2458 | inc dword[edi+png_struct.row_number] |
||
2459 | |||
2460 | |||
2461 | mov eax,[edi+png_struct.row_number] |
||
2462 | ;png_debug1 2, ' row_number = %d', eax |
||
2463 | ;png_debug1 2, ' num_rows = %d', [edi+png_struct.num_rows] |
||
2464 | cmp eax,[edi+png_struct.num_rows] |
||
2465 | jl .end_f ;if (..<..) return |
||
2466 | |||
2467 | |||
2468 | ; If interlaced, go to next pass |
||
2469 | cmp byte[edi+png_struct.interlaced],0 |
||
2470 | je .end0 ;if (..!=0) |
||
2471 | mov dword[edi+png_struct.row_number],0 |
||
2472 | mov eax,[edi+png_struct.transformations] |
||
2473 | and eax,PNG_INTERLACE |
||
2474 | jz @f ;if (..!=0) |
||
6780 | IgorA | 2475 | inc byte[edi+png_struct.pass] |
6733 | IgorA | 2476 | jmp .end1 |
2477 | @@: ;else |
||
2478 | ; Loop until we find a non-zero width or height pass |
||
2479 | .cycle0: ;do |
||
2480 | inc byte[edi+png_struct.pass] |
||
2481 | cmp byte[edi+png_struct.pass],7 |
||
2482 | jge .cycle0end ;if (..>=..) break |
||
2483 | |||
2484 | |||
2485 | add ecx,png_pass_inc |
||
2486 | movzx ecx,byte[ecx] |
||
2487 | mov eax,[edi+png_struct.width] |
||
2488 | add eax,ecx |
||
2489 | dec eax |
||
2490 | movzx edx,byte[edi+png_struct.pass] |
||
2491 | add edx,png_pass_start |
||
2492 | movzx edx,byte[edx] |
||
2493 | sub eax,edx |
||
2494 | xor edx,edx |
||
2495 | div ecx |
||
2496 | mov [edi+png_struct.usr_width],eax |
||
2497 | |||
2498 | |||
2499 | add ecx,png_pass_yinc |
||
2500 | movzx ecx,byte[ecx] |
||
2501 | mov eax,[edi+png_struct.height] |
||
2502 | add eax,ecx |
||
2503 | dec eax |
||
2504 | movzx edx,byte[edi+png_struct.pass] |
||
2505 | add edx,png_pass_ystart |
||
2506 | movzx edx,byte[edx] |
||
2507 | sub eax,edx |
||
2508 | xor edx,edx |
||
2509 | div ecx |
||
2510 | mov [edi+png_struct.num_rows],eax |
||
2511 | |||
2512 | |||
2513 | and eax,PNG_INTERLACE |
||
2514 | jnz .cycle0end ;if(..!=0) break |
||
6780 | IgorA | 2515 | |
6733 | IgorA | 2516 | |
2517 | je .cycle0 |
||
2518 | cmp dword[edi+png_struct.num_rows],0 |
||
2519 | je .cycle0 |
||
2520 | .cycle0end: ;while (..==0 || ..==0) |
||
2521 | .end1: |
||
2522 | |||
2523 | |||
2524 | cmp byte[edi+png_struct.pass],7 |
||
2525 | jge .end0 ;if (..<..) |
||
2526 | cmp dword[edi+png_struct.prev_row],0 |
||
2527 | je .end_f ;if (..!=0) |
||
2528 | movzx eax,byte[edi+png_struct.usr_channels] |
||
2529 | movzx edx,byte[edi+png_struct.usr_bit_depth] |
||
2530 | imul eax,edx |
||
2531 | PNG_ROWBYTES eax, [edi+png_struct.width] |
||
2532 | inc eax |
||
2533 | push edi |
||
2534 | mov ecx,eax |
||
2535 | xor eax,eax |
||
2536 | mov edi,[edi+png_struct.prev_row] |
||
2537 | rep stosb ;memset(... |
||
2538 | pop edi |
||
2539 | jmp .end_f |
||
2540 | .end0: |
||
2541 | end if |
||
2542 | |||
2543 | |||
2544 | ; to flush the compressor |
||
2545 | stdcall png_compress_IDAT, 0, 0, Z_FINISH |
||
2546 | .end_f: |
||
2547 | ret |
||
2548 | endp |
||
2549 | |||
2550 | |||
2551 | ; The basic idea here is to go through the row with a source |
||
2552 | ; pointer and a destination pointer (sp and dp), and copy the |
||
2553 | ; correct pixels for the pass. As the row gets compacted, |
||
2554 | ; sp will always be >= dp, so we should never overwrite anything. |
||
2555 | ; See the default: case for the easiest code to understand. |
||
2556 | |||
2557 | |||
2558 | align 4 |
||
2559 | proc png_do_write_interlace, row_info:dword, row:dword, pass:dword |
||
2560 | png_debug 1, 'in png_do_write_interlace' |
||
2561 | |||
2562 | |||
2563 | cmp dword[pass],6 |
||
2564 | jge .end_f ;if (..<..) |
||
2565 | ; Each pixel depth is handled separately |
||
2566 | ; switch (row_info->pixel_depth) |
||
2567 | ; { |
||
2568 | ; case 1: |
||
2569 | ; { |
||
2570 | ; bytep sp; |
||
2571 | ; bytep dp; |
||
2572 | ; unsigned int shift; |
||
2573 | ; int d; |
||
2574 | ; int value; |
||
2575 | ; uint_32 i; |
||
2576 | ; uint_32 row_width = row_info->width; |
||
2577 | |||
2578 | |||
2579 | ; d = 0; |
||
2580 | ; shift = 7; |
||
2581 | |||
2582 | |||
2583 | ; i += png_pass_inc[pass]) |
||
2584 | ; { |
||
2585 | ; sp = row + (png_size_t)(i >> 3); |
||
2586 | ; value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01; |
||
2587 | ; d |= (value << shift); |
||
2588 | |||
2589 | |||
2590 | ; { |
||
2591 | ; shift = 7; |
||
2592 | ; *dp++ = (byte)d; |
||
2593 | ; d = 0; |
||
2594 | ; } |
||
2595 | |||
2596 | |||
2597 | ; shift--; |
||
2598 | |||
2599 | |||
2600 | ; if (shift != 7) |
||
2601 | ; *dp = (byte)d; |
||
2602 | |||
2603 | |||
2604 | ; } |
||
2605 | |||
2606 | |||
2607 | ; { |
||
2608 | ; bytep sp; |
||
2609 | ; bytep dp; |
||
2610 | ; unsigned int shift; |
||
2611 | ; int d; |
||
2612 | ; int value; |
||
2613 | ; uint_32 i; |
||
2614 | ; uint_32 row_width = row_info->width; |
||
2615 | |||
2616 | |||
2617 | ; shift = 6; |
||
2618 | ; d = 0; |
||
2619 | |||
2620 | |||
2621 | ; i += png_pass_inc[pass]) |
||
2622 | ; { |
||
2623 | ; sp = row + (png_size_t)(i >> 2); |
||
2624 | ; value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03; |
||
2625 | ; d |= (value << shift); |
||
2626 | |||
2627 | |||
2628 | ; { |
||
2629 | ; shift = 6; |
||
2630 | ; *dp++ = (byte)d; |
||
2631 | ; d = 0; |
||
2632 | ; } |
||
2633 | |||
2634 | |||
2635 | ; shift -= 2; |
||
2636 | ; } |
||
2637 | ; if (shift != 6) |
||
2638 | ; *dp = (byte)d; |
||
2639 | |||
2640 | |||
2641 | ; } |
||
2642 | |||
2643 | |||
2644 | ; { |
||
2645 | ; bytep sp; |
||
2646 | ; bytep dp; |
||
2647 | ; unsigned int shift; |
||
2648 | ; int d; |
||
2649 | ; int value; |
||
2650 | ; uint_32 i; |
||
2651 | ; uint_32 row_width = row_info->width; |
||
2652 | |||
2653 | |||
2654 | ; shift = 4; |
||
2655 | ; d = 0; |
||
2656 | ; for (i = png_pass_start[pass]; i < row_width; |
||
2657 | ; i += png_pass_inc[pass]) |
||
2658 | ; { |
||
2659 | ; sp = row + (png_size_t)(i >> 1); |
||
2660 | ; value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; |
||
2661 | ; d |= (value << shift); |
||
2662 | |||
2663 | |||
2664 | ; { |
||
2665 | ; shift = 4; |
||
2666 | ; *dp++ = (byte)d; |
||
2667 | ; d = 0; |
||
2668 | ; } |
||
2669 | |||
2670 | |||
2671 | ; shift -= 4; |
||
2672 | ; } |
||
2673 | ; if (shift != 4) |
||
2674 | ; *dp = (byte)d; |
||
2675 | |||
2676 | |||
2677 | ; } |
||
2678 | |||
2679 | |||
2680 | ; { |
||
2681 | ; bytep sp; |
||
2682 | ; bytep dp; |
||
2683 | ; uint_32 i; |
||
2684 | ; uint_32 row_width = row_info->width; |
||
2685 | ; png_size_t pixel_bytes; |
||
2686 | |||
2687 | |||
2688 | ; dp = row; |
||
2689 | |||
2690 | |||
2691 | ; pixel_bytes = (row_info->pixel_depth >> 3); |
||
2692 | |||
2693 | |||
2694 | ; for (i = png_pass_start[pass]; i < row_width; |
||
2695 | ; i += png_pass_inc[pass]) |
||
2696 | ; { |
||
2697 | ; Find out where the original pixel is |
||
2698 | ; sp = row + (png_size_t)i * pixel_bytes; |
||
2699 | |||
2700 | |||
2701 | ; if (dp != sp) |
||
2702 | ; memcpy(dp, sp, pixel_bytes); |
||
2703 | |||
2704 | |||
2705 | ; dp += pixel_bytes; |
||
2706 | ; } |
||
2707 | ; break; |
||
2708 | ; } |
||
2709 | ; } |
||
2710 | ; Set new row width |
||
2711 | ; row_info->width = (row_info->width + |
||
2712 | ; png_pass_inc[pass] - 1 - |
||
2713 | ; png_pass_start[pass]) / |
||
2714 | ; png_pass_inc[pass]; |
||
2715 | |||
2716 | |||
2717 | ; row_info->width); |
||
2718 | .end_f: |
||
2719 | ret |
||
2720 | endp |
||
2721 | |||
2722 | |||
2723 | ; been specified by the application, and then writes the row out with the |
||
2724 | ; chosen filter. |
||
2725 | |||
2726 | |||
2727 | ; png_size_t row_bytes); |
||
2728 | |||
2729 | |||
2730 | align 4 |
||
2731 | proc png_setup_sub_row uses ebx ecx edx edi esi, png_ptr:dword, bpp:dword, row_bytes:dword, lmins:dword |
||
2732 | mov ebx,[png_ptr] |
||
2733 | mov edi,[ebx+png_struct.try_row] |
||
2734 | mov byte[edi],PNG_FILTER_VALUE_SUB |
||
2735 | |||
2736 | |||
2737 | inc edi |
||
2738 | mov esi,[ebx+png_struct.row_buf] |
||
2739 | inc esi |
||
2740 | xor eax,eax |
||
2741 | xor edx,edx |
||
2742 | .cycle0: |
||
2743 | lodsb |
||
2744 | stosb |
||
2745 | png_setup_abs edx |
||
2746 | loop .cycle0 |
||
2747 | |||
2748 | |||
2749 | sub ecx,[bpp] |
||
2750 | mov ebx,[ebx+png_struct.row_buf] |
||
2751 | inc ebx |
||
2752 | .cycle1: |
||
2753 | lodsb |
||
2754 | sub al,byte[ebx] |
||
2755 | stosb |
||
2756 | png_setup_abs edx |
||
2757 | cmp edx,[lmins] |
||
2758 | jg .cycle1end ;if (..>..) ;We are already worse, don't continue. |
||
2759 | inc ebx |
||
2760 | loop .cycle1 |
||
2761 | .cycle1end: |
||
2762 | mov eax,edx |
||
2763 | ret |
||
2764 | endp |
||
2765 | |||
2766 | |||
2767 | align 4 |
||
2768 | proc png_setup_sub_row_only, png_ptr:dword, bpp:dword, row_bytes:dword |
||
2769 | pushad |
||
2770 | mov ebx,[png_ptr] |
||
2771 | mov edi,[ebx+png_struct.try_row] |
||
2772 | mov byte[edi],PNG_FILTER_VALUE_SUB |
||
2773 | |||
2774 | |||
2775 | inc edi |
||
2776 | mov esi,[ebx+png_struct.row_buf] |
||
2777 | inc esi |
||
2778 | rep movsb |
||
2779 | |||
2780 | |||
2781 | sub ecx,[bpp] |
||
2782 | mov edx,[ebx+png_struct.row_buf] |
||
2783 | inc edx |
||
2784 | align 4 |
||
2785 | .cycle0: |
||
2786 | lodsb |
||
2787 | sub al,byte[edx] |
||
2788 | stosb |
||
2789 | inc edx |
||
2790 | loop .cycle0 |
||
2791 | popad |
||
2792 | ret |
||
2793 | endp |
||
2794 | |||
2795 | |||
2796 | align 4 |
||
2797 | proc png_setup_up_row uses ebx ecx edx edi esi, png_ptr:dword, row_bytes:dword, lmins:dword |
||
2798 | mov ebx,[png_ptr] |
||
2799 | mov edi,[ebx+png_struct.try_row] |
||
2800 | mov byte[edi],PNG_FILTER_VALUE_UP |
||
2801 | |||
2802 | |||
2803 | inc edi |
||
2804 | mov esi,[ebx+png_struct.row_buf] |
||
2805 | inc esi |
||
2806 | mov ebx,[ebx+png_struct.prev_row] |
||
2807 | inc ebx |
||
2808 | xor edx,edx |
||
2809 | .cycle0: |
||
2810 | lodsb |
||
2811 | sub al,byte[ebx] |
||
2812 | stosb |
||
2813 | png_setup_abs edx |
||
2814 | cmp edx,[lmins] |
||
2815 | jg .cycle0end ;if (..>..) ;We are already worse, don't continue. |
||
2816 | inc ebx |
||
2817 | loop .cycle0 |
||
2818 | .cycle0end: |
||
2819 | mov eax,edx |
||
2820 | ret |
||
2821 | endp |
||
2822 | |||
2823 | |||
2824 | align 4 |
||
2825 | proc png_setup_up_row_only, png_ptr:dword, row_bytes:dword |
||
2826 | pushad |
||
2827 | mov ebx,[png_ptr] |
||
2828 | mov edi,[ebx+png_struct.try_row] |
||
2829 | mov byte[edi],PNG_FILTER_VALUE_UP |
||
2830 | |||
2831 | |||
2832 | inc edi |
||
2833 | mov esi,[ebx+png_struct.row_buf] |
||
2834 | inc esi |
||
2835 | mov ebx,[ebx+png_struct.prev_row] |
||
2836 | inc ebx |
||
2837 | .cycle0: |
||
2838 | lodsb |
||
2839 | sub al,byte[ebx] |
||
2840 | stosb |
||
2841 | inc ebx |
||
2842 | loop .cycle0 |
||
2843 | popad |
||
2844 | ret |
||
2845 | endp |
||
2846 | |||
2847 | |||
2848 | align 4 |
||
2849 | proc png_setup_avg_row uses ebx ecx edx edi esi, png_ptr:dword, bpp:dword, row_bytes:dword, lmins:dword |
||
2850 | locals |
||
2851 | sum dd 0 ;png_size_t |
||
2852 | endl |
||
2853 | mov ebx,[png_ptr] |
||
2854 | mov edi,[ebx+png_struct.try_row] |
||
2855 | mov byte[edi],PNG_FILTER_VALUE_AVG |
||
2856 | |||
2857 | |||
2858 | inc edi |
||
2859 | mov esi,[ebx+png_struct.row_buf] |
||
2860 | inc esi |
||
2861 | mov ebx,[ebx+png_struct.prev_row] |
||
2862 | inc ebx |
||
2863 | .cycle0: |
||
2864 | lodsb |
||
2865 | mov ah,byte[ebx] |
||
2866 | shr ah,1 |
||
2867 | sub al,ah |
||
2868 | stosb |
||
2869 | png_setup_abs dword[sum] |
||
6780 | IgorA | 2870 | inc ebx |
6733 | IgorA | 2871 | loop .cycle0 |
2872 | |||
2873 | |||
2874 | sub ecx,[bpp] |
||
2875 | mov eax,[png_ptr] |
||
2876 | mov edx,[eax+png_struct.row_buf] |
||
2877 | inc edx |
||
2878 | .cycle1: |
||
2879 | lodsb |
||
2880 | shl eax,24 |
||
6779 | IgorA | 2881 | movzx ax,byte[ebx] |
2882 | add al,byte[edx] |
||
2883 | jnc @f |
||
2884 | mov ah,1 |
||
2885 | @@: |
||
2886 | shr ax,1 |
||
2887 | rol eax,8 |
||
2888 | sub al,ah |
||
6733 | IgorA | 2889 | stosb |
2890 | png_setup_abs dword[sum] |
||
6780 | IgorA | 2891 | mov eax,[sum] |
6733 | IgorA | 2892 | cmp eax,[lmins] |
2893 | jg .cycle1end ;if (..>..) ;We are already worse, don't continue. |
||
2894 | inc ebx |
||
2895 | inc edx |
||
2896 | loop .cycle1 |
||
2897 | .cycle1end: |
||
2898 | mov eax,[sum] |
||
2899 | ret |
||
2900 | endp |
||
2901 | |||
2902 | |||
2903 | align 4 |
||
2904 | proc png_setup_avg_row_only, png_ptr:dword, bpp:dword, row_bytes:dword |
||
2905 | pushad |
||
2906 | mov ebx,[png_ptr] |
||
2907 | mov edi,[ebx+png_struct.try_row] |
||
2908 | mov byte[edi],PNG_FILTER_VALUE_AVG |
||
2909 | |||
2910 | |||
2911 | inc edi |
||
2912 | mov esi,[ebx+png_struct.row_buf] |
||
2913 | inc esi |
||
2914 | mov ebx,[ebx+png_struct.prev_row] |
||
2915 | inc ebx |
||
2916 | .cycle0: |
||
2917 | lodsb |
||
2918 | mov ah,byte[ebx] |
||
2919 | shr ah,1 |
||
2920 | sub al,ah |
||
2921 | stosb |
||
2922 | inc ebx |
||
2923 | loop .cycle0 |
||
2924 | |||
2925 | |||
2926 | sub ecx,[bpp] |
||
2927 | mov eax,[png_ptr] |
||
2928 | mov edx,[eax+png_struct.row_buf] |
||
2929 | inc edx |
||
2930 | .cycle1: |
||
2931 | lodsb |
||
2932 | mov ah,byte[ebx] |
||
2933 | shr ah,1 |
||
2934 | sub al,ah |
||
2935 | mov ah,byte[edx] |
||
2936 | shr ah,1 |
||
2937 | sub al,ah |
||
2938 | stosb |
||
2939 | inc ebx |
||
2940 | inc edx |
||
2941 | loop .cycle1 |
||
2942 | popad |
||
2943 | ret |
||
2944 | endp |
||
2945 | |||
2946 | |||
2947 | ; const png_size_t row_bytes, const png_size_t lmins) |
||
2948 | align 4 |
||
2949 | proc png_setup_paeth_row, png_ptr:dword, bpp:dword, row_bytes:dword, lmins:dword |
||
2950 | ; bytep rp, dp, pp, cp, lp; |
||
2951 | ; png_size_t i; |
||
2952 | ; png_size_t sum = 0; |
||
2953 | ; int v; |
||
2954 | |||
2955 | |||
2956 | |||
2957 | |||
2958 | ; pp = png_ptr->prev_row + 1; i < bpp; i++) |
||
2959 | ; { |
||
2960 | ; v = *dp++ = (byte)(((int)*rp++ - (int)*pp++) & 0xff); |
||
2961 | |||
2962 | |||
2963 | ; sum += 128 - abs(v - 128); |
||
2964 | else |
||
2965 | ; sum += (v < 128) ? v : 256 - v; |
||
2966 | end if |
||
2967 | ; } |
||
2968 | |||
2969 | |||
2970 | ; i++) |
||
2971 | ; { |
||
2972 | ; int a, b, c, pa, pb, pc, p; |
||
2973 | |||
2974 | |||
2975 | ; c = *cp++; |
||
2976 | ; a = *lp++; |
||
2977 | |||
2978 | |||
2979 | ; pc = a - c; |
||
2980 | |||
2981 | |||
2982 | ; pa = abs(p); |
||
2983 | ; pb = abs(pc); |
||
2984 | ; pc = abs(p + pc); |
||
2985 | else |
||
2986 | ; pa = p < 0 ? -p : p; |
||
2987 | ; pb = pc < 0 ? -pc : pc; |
||
2988 | ; pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
||
2989 | end if |
||
2990 | |||
2991 | |||
2992 | |||
2993 | |||
2994 | |||
2995 | |||
2996 | ; sum += 128 - abs(v - 128); |
||
2997 | else |
||
2998 | ; sum += (v < 128) ? v : 256 - v; |
||
2999 | end if |
||
3000 | |||
3001 | |||
3002 | ; break; |
||
3003 | ; } |
||
3004 | |||
3005 | |||
3006 | ret |
||
3007 | endp |
||
3008 | |||
3009 | |||
3010 | align 4 |
||
3011 | proc png_setup_paeth_row_only, png_ptr:dword, bpp:dword, row_bytes:dword |
||
3012 | ; bytep rp, dp, pp, cp, lp; |
||
3013 | ; png_size_t i; |
||
3014 | |||
3015 | |||
3016 | |||
3017 | |||
3018 | ; pp = png_ptr->prev_row + 1; i < bpp; i++) |
||
3019 | ; { |
||
3020 | ; *dp++ = (byte)(((int)*rp++ - (int)*pp++) & 0xff); |
||
3021 | ; } |
||
3022 | |||
3023 | |||
3024 | ; i++) |
||
3025 | ; { |
||
3026 | ; int a, b, c, pa, pb, pc, p; |
||
3027 | |||
3028 | |||
3029 | ; c = *cp++; |
||
3030 | ; a = *lp++; |
||
3031 | |||
3032 | |||
3033 | ; pc = a - c; |
||
3034 | |||
3035 | |||
3036 | ; pa = abs(p); |
||
3037 | ; pb = abs(pc); |
||
3038 | ; pc = abs(p + pc); |
||
3039 | else |
||
3040 | ; pa = p < 0 ? -p : p; |
||
3041 | ; pb = pc < 0 ? -pc : pc; |
||
3042 | ; pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
||
3043 | end if |
||
3044 | |||
3045 | |||
3046 | |||
3047 | |||
3048 | ; } |
||
3049 | ret |
||
3050 | endp |
||
3051 | |||
3052 | |||
3053 | align 4 |
||
3054 | proc png_write_find_filter, png_ptr:dword, row_info:dword |
||
3055 | locals |
||
3056 | filter_to_do dd ? ;unsigned int ;= png_ptr->do_filter |
||
3057 | row_buf dd ? ;bytep |
||
3058 | best_row dd ? ;bytep |
||
3059 | bpp dd ? ;uint_32 |
||
3060 | mins dd ? ;png_size_t |
||
3061 | row_bytes dd ? ;png_size_t ;= row_info->rowbytes |
||
3062 | endl |
||
3063 | pushad |
||
3064 | mov edi,[png_ptr] |
||
3065 | if PNG_WRITE_FILTER_SUPPORTED eq 1 |
||
3066 | mov eax,[edi+png_struct.rowbytes] |
||
3067 | inc eax |
||
3068 | stdcall png_write_filtered_row, edi, [edi+png_struct.row_buf], eax |
||
3069 | else |
||
3070 | mov esi,[row_info] |
||
3071 | mov eax,[edi+png_struct.do_filter] |
||
3072 | mov [filter_to_do],eax |
||
3073 | mov eax,[esi+png_row_info.rowbytes] |
||
3074 | mov [row_bytes],eax |
||
3075 | |||
3076 | |||
3077 | |||
3078 | |||
3079 | |||
3080 | movzx eax,byte[edi+png_struct.pixel_depth] |
||
3081 | add eax,7 |
||
3082 | shr eax,3 |
||
3083 | mov [bpp],eax |
||
3084 | |||
3085 | |||
3086 | mov [row_buf],eax |
||
3087 | mov dword[mins], PNG_SIZE_MAX - 256 ;so we can detect potential overflow of the |
||
3088 | ;running sum |
||
3089 | |||
3090 | |||
3091 | ; smallest value when summing the absolute values of the distances |
||
3092 | ; from zero, using anything >= 128 as negative numbers. This is known |
||
3093 | ; as the "minimum sum of absolute differences" heuristic. Other |
||
3094 | ; heuristics are the "weighted minimum sum of absolute differences" |
||
3095 | ; (experimental and can in theory improve compression), and the "zlib |
||
3096 | ; predictive" method (not implemented yet), which does test compressions |
||
3097 | ; of lines using different filter methods, and then chooses the |
||
3098 | ; (series of) filter(s) that give minimum compressed data size (VERY |
||
3099 | ; computationally expensive). |
||
3100 | |||
3101 | |||
3102 | |||
3103 | |||
3104 | ; keep running sum of non-absolute differences & count of bytes) |
||
3105 | ; [track dispersion, too? restart average if dispersion too large?] |
||
3106 | |||
3107 | |||
3108 | ; with window size <= deflate window (usually 32K) |
||
3109 | |||
3110 | |||
3111 | ; (i.e., ~ root-mean-square approach) |
||
3112 | |||
3113 | |||
3114 | |||
3115 | |||
3116 | ; that has been chosen, as it doesn't actually do anything to the data. |
||
3117 | |||
3118 | |||
3119 | mov [best_row],eax |
||
3120 | |||
3121 | |||
3122 | jg @f ;if (..<=..) |
||
3123 | ; Overflow can occur in the calculation, just select the lowest set |
||
3124 | ; filter. |
||
3125 | |||
3126 | |||
3127 | sub eax,[filter_to_do] |
||
3128 | and [filter_to_do],eax |
||
3129 | jmp .end0 |
||
3130 | @@: |
||
3131 | mov eax,[filter_to_do] |
||
3132 | and eax,PNG_FILTER_NONE |
||
3133 | jz .end0 |
||
6780 | IgorA | 3134 | cmp dword[filter_to_do],PNG_FILTER_NONE |
6733 | IgorA | 3135 | je .end0 ;else if (..!=0 && ..!=..) |
3136 | ; Overflow not possible and multiple filters in the list, including the |
||
3137 | ; 'none' filter. |
||
3138 | |||
3139 | |||
3140 | xor eax,eax |
||
3141 | xor ebx,ebx |
||
3142 | mov ecx,[row_bytes] |
||
3143 | mov esi,[row_buf] |
||
3144 | .cycle0: |
||
3145 | lodsb |
||
3146 | png_setup_abs ebx |
||
3147 | loop .cycle0 |
||
3148 | pop esi |
||
3149 | mov [mins],ebx |
||
3150 | .end0: |
||
3151 | |||
3152 | |||
3153 | mov eax,[filter_to_do] |
||
3154 | cmp eax,PNG_FILTER_SUB |
||
3155 | jne @f ;if (..==..) |
||
3156 | ; It's the only filter so no testing is needed |
||
3157 | stdcall png_setup_sub_row_only, edi, [bpp], [row_bytes] |
||
3158 | mov eax,[edi+png_struct.try_row] |
||
3159 | mov [best_row],eax |
||
3160 | jmp .end1 |
||
3161 | @@: |
||
3162 | and eax,PNG_FILTER_SUB |
||
3163 | jz .end1 ;else if (..!=0) |
||
6780 | IgorA | 3164 | stdcall png_setup_sub_row, edi, [bpp], [row_bytes], [mins] |
6733 | IgorA | 3165 | cmp eax,[mins] |
3166 | jge .end1 ;if (..<..) |
||
3167 | mov [mins],eax |
||
3168 | mov eax,[edi+png_struct.try_row] |
||
3169 | mov [best_row],eax |
||
3170 | cmp eax,0 |
||
3171 | je .end1 ;if (..!=0) |
||
3172 | mov eax,[edi+png_struct.tst_row] |
||
3173 | mov [edi+png_struct.try_row],eax |
||
3174 | mov eax,[best_row] |
||
3175 | mov [edi+png_struct.tst_row],eax |
||
3176 | .end1: |
||
3177 | |||
3178 | |||
3179 | mov eax,[filter_to_do] |
||
3180 | cmp eax,PNG_FILTER_UP |
||
3181 | jne @f ;if (..==..) |
||
3182 | ; It's the only filter so no testing is needed |
||
3183 | stdcall png_setup_up_row_only, edi, [row_bytes] |
||
3184 | mov eax,[edi+png_struct.try_row] |
||
3185 | mov [best_row],eax |
||
3186 | jmp .end2 |
||
3187 | @@: |
||
3188 | and eax,PNG_FILTER_UP |
||
3189 | jz .end2 ;else if (..!=0) |
||
6780 | IgorA | 3190 | stdcall png_setup_up_row, edi, [row_bytes], [mins] |
6733 | IgorA | 3191 | cmp eax,[mins] |
3192 | jge .end2 ;if (..<..) |
||
3193 | mov [mins],eax |
||
3194 | mov eax,[edi+png_struct.try_row] |
||
3195 | mov [best_row],eax |
||
3196 | cmp eax,0 |
||
3197 | je .end2 ;if (..!=0) |
||
3198 | mov eax,[edi+png_struct.tst_row] |
||
3199 | mov [edi+png_struct.try_row],eax |
||
3200 | mov eax,[best_row] |
||
3201 | mov [edi+png_struct.tst_row],eax |
||
3202 | .end2: |
||
3203 | |||
3204 | |||
3205 | mov eax,[filter_to_do] |
||
3206 | cmp eax,PNG_FILTER_AVG |
||
3207 | jne @f ;if (..==..) |
||
3208 | ; It's the only filter so no testing is needed |
||
3209 | stdcall png_setup_avg_row_only, edi, [bpp], [row_bytes] |
||
3210 | mov eax,[edi+png_struct.try_row] |
||
3211 | mov [best_row],eax |
||
3212 | jmp .end3 |
||
3213 | @@: |
||
3214 | and eax,PNG_FILTER_AVG |
||
3215 | jz .end3 ;else if (..!=0) |
||
6780 | IgorA | 3216 | stdcall png_setup_avg_row, edi, [bpp], [row_bytes], [mins] |
6733 | IgorA | 3217 | cmp eax,[mins] |
3218 | jge .end3 ;if (..<..) |
||
3219 | mov [mins],eax |
||
3220 | mov eax,[edi+png_struct.try_row] |
||
3221 | mov [best_row],eax |
||
3222 | cmp eax,0 |
||
3223 | je .end3 ;if (..!=0) |
||
3224 | mov eax,[edi+png_struct.tst_row] |
||
3225 | mov [edi+png_struct.try_row],eax |
||
3226 | mov eax,[best_row] |
||
3227 | mov [edi+png_struct.tst_row],eax |
||
3228 | .end3: |
||
3229 | |||
3230 | |||
3231 | mov eax,[filter_to_do] |
||
3232 | cmp eax,PNG_FILTER_PAETH |
||
3233 | jne @f ;if (..==..) |
||
3234 | ; It's the only filter so no testing is needed |
||
3235 | stdcall png_setup_paeth_row_only, edi, [bpp], [row_bytes] |
||
3236 | mov eax,[edi+png_struct.try_row] |
||
3237 | mov [best_row],eax |
||
3238 | jmp .end4 |
||
3239 | @@: |
||
3240 | and eax,PNG_FILTER_PAETH |
||
3241 | jz .end4 ;else if (..!=0) |
||
6780 | IgorA | 3242 | stdcall png_setup_paeth_row, edi, [bpp], [row_bytes], [mins] |
6733 | IgorA | 3243 | cmp eax,[mins] |
3244 | jge .end4 ;if (..<..) |
||
3245 | mov [mins],eax |
||
3246 | mov eax,[edi+png_struct.try_row] |
||
3247 | mov [best_row],eax |
||
3248 | cmp eax,0 |
||
3249 | je .end4 ;if (..!=0) |
||
3250 | mov eax,[edi+png_struct.tst_row] |
||
3251 | mov [edi+png_struct.try_row],eax |
||
3252 | mov eax,[best_row] |
||
3253 | mov [edi+png_struct.tst_row],eax |
||
3254 | .end4: |
||
3255 | |||
3256 | |||
3257 | mov eax,[esi+png_row_info.rowbytes] |
||
3258 | inc eax |
||
3259 | stdcall png_write_filtered_row, edi, [best_row], eax |
||
3260 | end if ;WRITE_FILTER |
||
3261 | popad |
||
3262 | ret |
||
3263 | endp |
||
3264 | |||
3265 | |||
3266 | |||
3267 | ;void (png_structrp png_ptr, bytep filtered_row, |
||
3268 | ; png_size_t full_row_length/*includes filter byte*/) |
||
3269 | align 4 |
||
3270 | proc png_write_filtered_row uses eax ebx edi, png_ptr:dword, filtered_row:dword, full_row_length:dword |
||
3271 | png_debug 1, 'in png_write_filtered_row' |
||
3272 | |||
3273 | |||
3274 | movzx eax,byte[eax] |
||
3275 | png_debug1 2, 'filter = %d', eax |
||
3276 | |||
3277 | |||
3278 | stdcall png_compress_IDAT, [filtered_row], [full_row_length], Z_NO_FLUSH |
||
3279 | |||
3280 | |||
3281 | ; Swap the current and previous rows |
||
3282 | mov eax,[edi+png_struct.prev_row] |
||
3283 | cmp eax,0 |
||
3284 | je @f ;if (..!=0) |
||
3285 | ;eax = tptr |
||
3286 | mov ebx,[edi+png_struct.row_buf] |
||
3287 | mov [edi+png_struct.prev_row],ebx |
||
3288 | mov [edi+png_struct.row_buf],eax |
||
3289 | @@: |
||
3290 | end if ;WRITE_FILTER |
||
3291 | |||
3292 | |||
3293 | stdcall png_write_finish_row, edi |
||
3294 | |||
3295 | |||
3296 | inc dword[edi+png_struct.flush_rows] |
||
3297 | |||
3298 | |||
3299 | cmp eax,0 |
||
3300 | jle @f |
||
3301 | cmp [edi+png_struct.flush_rows],eax |
||
3302 | jl @f ;if (..>0 && ..>=..) |
||
3303 | stdcall png_write_flush, edi |
||
3304 | @@: |
||
3305 | end if ;WRITE_FLUSH |
||
3306 | ret |
||
3307 | endp |
||
3308 | > |