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Rev | Author | Line No. | Line |
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1897 | serge | 1 | |
2 | * |
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3 | * Copyright (c) 1998-2013 Glenn Randers-Pehrson |
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3928 | Serge | 4 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
1897 | serge | 5 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
6 | * |
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7 | * Last changed in libpng 1.6.1 [March 28, 2013] |
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3928 | Serge | 8 | * |
1897 | serge | 9 | * This code is released under the libpng license. |
10 | * For conditions of distribution and use, see the disclaimer |
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11 | * and license in png.h |
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12 | */ |
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13 | |||
14 | |||
15 | * The only people who need to care about what is inside of this are the |
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16 | * people who will be modifying the library for their own special needs. |
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17 | * It should NOT be accessed directly by an application. |
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18 | */ |
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19 | |||
20 | |||
21 | #define PNGSTRUCT_H |
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22 | /* zlib.h defines the structure z_stream, an instance of which is included |
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23 | * in this structure and is required for decompressing the LZ compressed |
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24 | * data in PNG files. |
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25 | */ |
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26 | #ifndef ZLIB_CONST |
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3928 | Serge | 27 | /* We must ensure that zlib uses 'const' in declarations. */ |
28 | # define ZLIB_CONST |
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29 | #endif |
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30 | #include "zlib.h" |
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1897 | serge | 31 | #ifdef const |
3928 | Serge | 32 | /* zlib.h sometimes #defines const to nothing, undo this. */ |
33 | # undef const |
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34 | #endif |
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35 | |||
1897 | serge | 36 | |
3928 | Serge | 37 | * with older builds. |
38 | */ |
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39 | #if ZLIB_VERNUM < 0x1260 |
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40 | # define PNGZ_MSG_CAST(s) png_constcast(char*,s) |
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41 | # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) |
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42 | #else |
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43 | # define PNGZ_MSG_CAST(s) (s) |
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44 | # define PNGZ_INPUT_CAST(b) (b) |
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45 | #endif |
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46 | |||
47 | |||
48 | * can handle at once. This type need be no larger than 16 bits (so maximum of |
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49 | * 65535), this define allows us to discover how big it is, but limited by the |
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50 | * maximuum for png_size_t. The value can be overriden in a library build |
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51 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
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52 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
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53 | * and may even improve performance on some systems (and degrade it on others.) |
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54 | */ |
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55 | #ifndef ZLIB_IO_MAX |
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56 | # define ZLIB_IO_MAX ((uInt)-1) |
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57 | #endif |
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58 | |||
59 | |||
60 | /* The type of a compression buffer list used by the write code. */ |
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61 | typedef struct png_compression_buffer |
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62 | { |
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63 | struct png_compression_buffer *next; |
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64 | png_byte output[1]; /* actually zbuf_size */ |
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65 | } png_compression_buffer, *png_compression_bufferp; |
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66 | |||
67 | |||
68 | (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) |
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69 | #endif |
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70 | |||
71 | |||
72 | * functions to hold and communicate information about the color space. |
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73 | * |
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74 | * PNG_COLORSPACE_SUPPORTED is only required if the application will perform |
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75 | * colorspace corrections, otherwise all the colorspace information can be |
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76 | * skipped and the size of libpng can be reduced (significantly) by compiling |
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77 | * out the colorspace support. |
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78 | */ |
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79 | #ifdef PNG_COLORSPACE_SUPPORTED |
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80 | /* The chromaticities of the red, green and blue colorants and the chromaticity |
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81 | * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). |
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82 | */ |
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83 | typedef struct png_xy |
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84 | { |
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85 | png_fixed_point redx, redy; |
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86 | png_fixed_point greenx, greeny; |
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87 | png_fixed_point bluex, bluey; |
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88 | png_fixed_point whitex, whitey; |
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89 | } png_xy; |
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90 | |||
91 | |||
92 | * from chromaticities the sum of the Y values is assumed to be 1.0 |
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93 | */ |
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94 | typedef struct png_XYZ |
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95 | { |
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96 | png_fixed_point red_X, red_Y, red_Z; |
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97 | png_fixed_point green_X, green_Y, green_Z; |
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98 | png_fixed_point blue_X, blue_Y, blue_Z; |
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99 | } png_XYZ; |
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100 | #endif /* COLORSPACE */ |
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101 | |||
102 | |||
103 | /* A colorspace is all the above plus, potentially, profile information, |
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104 | * however at present libpng does not use the profile internally so it is only |
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105 | * stored in the png_info struct (if iCCP is supported.) The rendering intent |
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106 | * is retained here and is checked. |
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107 | * |
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108 | * The file gamma encoding information is also stored here and gamma correction |
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109 | * is done by libpng, whereas color correction must currently be done by the |
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110 | * application. |
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111 | */ |
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112 | typedef struct png_colorspace |
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113 | { |
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114 | #ifdef PNG_GAMMA_SUPPORTED |
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115 | png_fixed_point gamma; /* File gamma */ |
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116 | #endif |
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117 | |||
118 | |||
119 | png_xy end_points_xy; /* End points as chromaticities */ |
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120 | png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ |
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121 | png_uint_16 rendering_intent; /* Rendering intent of a profile */ |
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122 | #endif |
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123 | |||
124 | |||
125 | png_uint_16 flags; /* As defined below */ |
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126 | } png_colorspace, * PNG_RESTRICT png_colorspacerp; |
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127 | |||
128 | |||
129 | |||
130 | |||
131 | #define PNG_COLORSPACE_HAVE_GAMMA 0x0001 |
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132 | #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 |
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133 | #define PNG_COLORSPACE_HAVE_INTENT 0x0004 |
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134 | #define PNG_COLORSPACE_FROM_gAMA 0x0008 |
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135 | #define PNG_COLORSPACE_FROM_cHRM 0x0010 |
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136 | #define PNG_COLORSPACE_FROM_sRGB 0x0020 |
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137 | #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 |
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138 | #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ |
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139 | #define PNG_COLORSPACE_INVALID 0x8000 |
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140 | #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) |
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141 | #endif /* COLORSPACE || GAMMA */ |
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142 | |||
143 | |||
1897 | serge | 144 | { |
145 | #ifdef PNG_SETJMP_SUPPORTED |
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146 | jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ |
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3928 | Serge | 147 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ |
1897 | serge | 148 | jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ |
3928 | Serge | 149 | size_t jmp_buf_size; /* size of the above, if allocated */ |
150 | #endif |
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1897 | serge | 151 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
152 | #ifdef PNG_WARNINGS_SUPPORTED |
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3928 | Serge | 153 | png_error_ptr warning_fn; /* function for printing warnings */ |
1897 | serge | 154 | #endif |
3928 | Serge | 155 | png_voidp error_ptr; /* user supplied struct for error functions */ |
1897 | serge | 156 | png_rw_ptr write_data_fn; /* function for writing output data */ |
157 | png_rw_ptr read_data_fn; /* function for reading input data */ |
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158 | png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
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159 | |||
160 | |||
161 | png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
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162 | #endif |
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163 | |||
164 | |||
165 | png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
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166 | #endif |
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167 | |||
168 | |||
169 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
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170 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
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171 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
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172 | png_voidp user_transform_ptr; /* user supplied struct for user transform */ |
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173 | png_byte user_transform_depth; /* bit depth of user transformed pixels */ |
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174 | png_byte user_transform_channels; /* channels in user transformed pixels */ |
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175 | #endif |
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176 | #endif |
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177 | |||
178 | |||
179 | png_uint_32 flags; /* flags indicating various things to libpng */ |
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180 | png_uint_32 transformations; /* which transformations to perform */ |
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181 | |||
182 | |||
3928 | Serge | 183 | z_stream zstream; /* decompression structure */ |
184 | |||
185 | |||
186 | png_compression_bufferp zbuffer_list; /* Created on demand during write */ |
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187 | uInt zbuffer_size; /* size of the actual buffer */ |
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188 | |||
189 | |||
1897 | serge | 190 | int zlib_method; /* holds zlib compression method */ |
191 | int zlib_window_bits; /* holds zlib compression window bits */ |
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192 | int zlib_mem_level; /* holds zlib compression memory level */ |
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193 | int zlib_strategy; /* holds zlib compression strategy */ |
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194 | #endif |
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3928 | Serge | 195 | /* Added at libpng 1.5.4 */ |
196 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
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197 | int zlib_text_level; /* holds zlib compression level */ |
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198 | int zlib_text_method; /* holds zlib compression method */ |
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199 | int zlib_text_window_bits; /* holds zlib compression window bits */ |
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200 | int zlib_text_mem_level; /* holds zlib compression memory level */ |
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201 | int zlib_text_strategy; /* holds zlib compression strategy */ |
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202 | #endif |
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203 | /* End of material added at libpng 1.5.4 */ |
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204 | /* Added at libpng 1.6.0 */ |
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205 | #ifdef PNG_WRITE_SUPPORTED |
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206 | int zlib_set_level; /* Actual values set into the zstream on write */ |
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207 | int zlib_set_method; |
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208 | int zlib_set_window_bits; |
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209 | int zlib_set_mem_level; |
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210 | int zlib_set_strategy; |
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211 | #endif |
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212 | |||
1897 | serge | 213 | |
214 | png_uint_32 height; /* height of image in pixels */ |
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215 | png_uint_32 num_rows; /* number of rows in current pass */ |
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216 | png_uint_32 usr_width; /* width of row at start of write */ |
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217 | png_size_t rowbytes; /* size of row in bytes */ |
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218 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
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219 | png_uint_32 row_number; /* current row in interlace pass */ |
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220 | png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ |
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3928 | Serge | 221 | png_bytep prev_row; /* buffer to save previous (unfiltered) row. |
222 | * This is a pointer into big_prev_row |
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223 | */ |
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224 | png_bytep row_buf; /* buffer to save current (unfiltered) row. |
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225 | * This is a pointer into big_row_buf |
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226 | */ |
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227 | #ifdef PNG_WRITE_SUPPORTED |
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228 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
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1897 | serge | 229 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
230 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
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231 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
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232 | #endif |
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3928 | Serge | 233 | png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ |
234 | |||
1897 | serge | 235 | |
236 | png_uint_32 crc; /* current chunk CRC value */ |
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237 | png_colorp palette; /* palette from the input file */ |
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238 | png_uint_16 num_palette; /* number of color entries in palette */ |
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239 | |||
3928 | Serge | 240 | |
241 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
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242 | int num_palette_max; /* maximum palette index found in IDAT */ |
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243 | #endif |
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244 | |||
245 | |||
1897 | serge | 246 | png_byte compression; /* file compression type (always 0) */ |
247 | png_byte filter; /* file filter type (always 0) */ |
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248 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
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249 | png_byte pass; /* current interlace pass (0 - 6) */ |
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250 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
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251 | png_byte color_type; /* color type of file */ |
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252 | png_byte bit_depth; /* bit depth of file */ |
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253 | png_byte usr_bit_depth; /* bit depth of users row: write only */ |
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3928 | Serge | 254 | png_byte pixel_depth; /* number of bits per pixel */ |
1897 | serge | 255 | png_byte channels; /* number of channels in file */ |
256 | #ifdef PNG_WRITE_SUPPORTED |
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3928 | Serge | 257 | png_byte usr_channels; /* channels at start of write: write only */ |
258 | #endif |
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259 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
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1897 | serge | 260 | png_byte maximum_pixel_depth; |
3928 | Serge | 261 | /* pixel depth used for the row buffers */ |
262 | png_byte transformed_pixel_depth; |
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263 | /* pixel depth after read/write transforms */ |
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264 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
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1897 | serge | 265 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
266 | #endif |
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267 | |||
268 | |||
3928 | Serge | 269 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
270 | png_byte background_gamma_type; |
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1897 | serge | 271 | png_fixed_point background_gamma; |
272 | png_color_16 background; /* background color in screen gamma space */ |
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273 | #ifdef PNG_READ_GAMMA_SUPPORTED |
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274 | png_color_16 background_1; /* background normalized to gamma 1.0 */ |
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275 | #endif |
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276 | #endif /* PNG_bKGD_SUPPORTED */ |
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277 | |||
278 | |||
279 | png_flush_ptr output_flush_fn; /* Function for flushing output */ |
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280 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
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281 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
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282 | #endif |
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283 | |||
284 | |||
3928 | Serge | 285 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ |
1897 | serge | 286 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ |
287 | |||
288 | |||
289 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
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3928 | Serge | 290 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
291 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ |
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292 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
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293 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
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1897 | serge | 294 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
295 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
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296 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
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297 | #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ |
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3928 | Serge | 298 | #endif |
1897 | serge | 299 | |
300 | |||
301 | png_color_8 sig_bit; /* significant bits in each available channel */ |
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302 | #endif |
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303 | |||
304 | |||
305 | png_color_8 shift; /* shift for significant bit tranformation */ |
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306 | #endif |
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307 | |||
308 | |||
309 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
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310 | png_bytep trans_alpha; /* alpha values for paletted files */ |
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311 | png_color_16 trans_color; /* transparent color for non-paletted files */ |
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312 | #endif |
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313 | |||
314 | |||
315 | png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
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316 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
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317 | png_progressive_info_ptr info_fn; /* called after header data fully read */ |
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318 | png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */ |
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319 | png_progressive_end_ptr end_fn; /* called after image is complete */ |
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320 | png_bytep save_buffer_ptr; /* current location in save_buffer */ |
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321 | png_bytep save_buffer; /* buffer for previously read data */ |
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322 | png_bytep current_buffer_ptr; /* current location in current_buffer */ |
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323 | png_bytep current_buffer; /* buffer for recently used data */ |
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324 | png_uint_32 push_length; /* size of current input chunk */ |
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325 | png_uint_32 skip_length; /* bytes to skip in input data */ |
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326 | png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
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327 | png_size_t save_buffer_max; /* total size of save_buffer */ |
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328 | png_size_t buffer_size; /* total amount of available input data */ |
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329 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
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330 | int process_mode; /* what push library is currently doing */ |
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331 | int cur_palette; /* current push library palette index */ |
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332 | |||
333 | |||
334 | |||
335 | |||
336 | /* For the Borland special 64K segment handler */ |
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337 | png_bytepp offset_table_ptr; |
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338 | png_bytep offset_table; |
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339 | png_uint_16 offset_table_number; |
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340 | png_uint_16 offset_table_count; |
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341 | png_uint_16 offset_table_count_free; |
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342 | #endif |
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343 | |||
344 | |||
345 | png_bytep palette_lookup; /* lookup table for quantizing */ |
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346 | png_bytep quantize_index; /* index translation for palette files */ |
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347 | #endif |
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348 | |||
349 | |||
350 | png_byte heuristic_method; /* heuristic for row filter selection */ |
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351 | png_byte num_prev_filters; /* number of weights for previous rows */ |
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352 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
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353 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
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354 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
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355 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
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356 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
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357 | #endif |
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358 | |||
359 | |||
3928 | Serge | 360 | #ifdef PNG_SET_OPTION_SUPPORTED |
361 | png_byte options; /* On/off state (up to 4 options) */ |
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362 | #endif |
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363 | |||
364 | |||
365 | /* To do: remove this from libpng-1.7 */ |
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366 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
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1897 | serge | 367 | char time_buffer[29]; /* String to hold RFC 1123 time text */ |
3928 | Serge | 368 | #endif |
1897 | serge | 369 | #endif |
3928 | Serge | 370 | |
1897 | serge | 371 | |
372 | |||
373 | |||
374 | |||
375 | |||
376 | png_voidp user_chunk_ptr; |
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377 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
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3928 | Serge | 378 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
1897 | serge | 379 | #endif |
380 | #endif |
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3928 | Serge | 381 | |
1897 | serge | 382 | |
3928 | Serge | 383 | int unknown_default; /* As PNG_HANDLE_* */ |
384 | unsigned int num_chunk_list; /* Number of entries in the list */ |
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385 | png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name |
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386 | * followed by a PNG_HANDLE_* byte */ |
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387 | #endif |
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1897 | serge | 388 | |
389 | |||
390 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
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391 | png_byte rgb_to_gray_status; |
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392 | /* Added in libpng 1.5.5 to record setting of coefficients: */ |
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3928 | Serge | 393 | png_byte rgb_to_gray_coefficients_set; |
394 | /* These were changed from png_byte in libpng-1.0.6 */ |
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1897 | serge | 395 | png_uint_16 rgb_to_gray_red_coeff; |
396 | png_uint_16 rgb_to_gray_green_coeff; |
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397 | /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */ |
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3928 | Serge | 398 | #endif |
1897 | serge | 399 | |
400 | |||
401 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
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3928 | Serge | 402 | /* Changed from png_byte to png_uint_32 at version 1.2.0 */ |
1897 | serge | 403 | png_uint_32 mng_features_permitted; |
404 | #endif |
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405 | |||
406 | |||
407 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
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408 | png_byte filter_type; |
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409 | #endif |
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410 | |||
411 | |||
412 | |||
413 | |||
414 | #ifdef PNG_USER_MEM_SUPPORTED |
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415 | png_voidp mem_ptr; /* user supplied struct for mem functions */ |
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416 | png_malloc_ptr malloc_fn; /* function for allocating memory */ |
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417 | png_free_ptr free_fn; /* function for freeing memory */ |
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418 | #endif |
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419 | |||
420 | |||
421 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ |
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422 | |||
423 | |||
424 | /* The following three members were added at version 1.0.14 and 1.2.4 */ |
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425 | png_bytep quantize_sort; /* working sort array */ |
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426 | png_bytep index_to_palette; /* where the original index currently is |
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427 | in the palette */ |
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428 | png_bytep palette_to_index; /* which original index points to this |
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429 | palette color */ |
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430 | #endif |
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431 | |||
432 | |||
433 | png_byte compression_type; |
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434 | |||
435 | |||
436 | png_uint_32 user_width_max; |
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437 | png_uint_32 user_height_max; |
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438 | |||
439 | |||
440 | * chunks that can be stored (0 means unlimited). |
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441 | */ |
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442 | png_uint_32 user_chunk_cache_max; |
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443 | |||
444 | |||
445 | * can occupy when decompressed. 0 means unlimited. |
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446 | */ |
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447 | png_alloc_size_t user_chunk_malloc_max; |
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448 | #endif |
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449 | |||
450 | |||
451 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
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3928 | Serge | 452 | /* Temporary storage for unknown chunk that the library doesn't recognize, |
453 | * used while reading the chunk. |
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454 | */ |
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455 | png_unknown_chunk unknown_chunk; |
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1897 | serge | 456 | #endif |
457 | |||
458 | |||
3928 | Serge | 459 | png_size_t old_big_row_buf_size; |
1897 | serge | 460 | |
461 | |||
3928 | Serge | 462 | /* New member added in libpng-1.2.30 */ |
1897 | serge | 463 | png_bytep read_buffer; /* buffer for reading chunk data */ |
3928 | Serge | 464 | png_alloc_size_t read_buffer_size; /* current size of the buffer */ |
465 | #endif |
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466 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
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467 | uInt IDAT_read_size; /* limit on read buffer size for IDAT */ |
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468 | #endif |
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469 | |||
1897 | serge | 470 | |
471 | /* New member added in libpng-1.4.0 */ |
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472 | png_uint_32 io_state; |
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473 | #endif |
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474 | |||
3928 | Serge | 475 | |
476 | png_bytep big_prev_row; |
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477 | |||
478 | |||
479 | void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info, |
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480 | png_bytep row, png_const_bytep prev_row); |
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481 | |||
482 | |||
483 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) |
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484 | png_colorspace colorspace; |
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485 | #endif |
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486 | #endif |
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487 | }; |
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1897 | serge | 488 | #endif /* PNGSTRUCT_H */>> |
489 |