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Rev | Author | Line No. | Line |
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6417 | ashmew2 | 1 | /* |
2 | * wrbmp.c |
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3 | * |
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4 | * Copyright (C) 1994-1996, Thomas G. Lane. |
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5 | * This file is part of the Independent JPEG Group's software. |
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6 | * For conditions of distribution and use, see the accompanying README file. |
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7 | * |
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8 | * This file contains routines to write output images in Microsoft "BMP" |
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9 | * format (MS Windows 3.x and OS/2 1.x flavors). |
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10 | * Either 8-bit colormapped or 24-bit full-color format can be written. |
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11 | * No compression is supported. |
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12 | * |
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13 | * These routines may need modification for non-Unix environments or |
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14 | * specialized applications. As they stand, they assume output to |
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15 | * an ordinary stdio stream. |
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16 | * |
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17 | * This code contributed by James Arthur Boucher. |
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18 | */ |
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19 | |||
20 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
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21 | |||
22 | #ifdef BMP_SUPPORTED |
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23 | |||
24 | |||
25 | /* |
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26 | * To support 12-bit JPEG data, we'd have to scale output down to 8 bits. |
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27 | * This is not yet implemented. |
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28 | */ |
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29 | |||
30 | #if BITS_IN_JSAMPLE != 8 |
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31 | Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ |
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32 | #endif |
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33 | |||
34 | /* |
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35 | * Since BMP stores scanlines bottom-to-top, we have to invert the image |
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36 | * from JPEG's top-to-bottom order. To do this, we save the outgoing data |
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37 | * in a virtual array during put_pixel_row calls, then actually emit the |
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38 | * BMP file during finish_output. The virtual array contains one JSAMPLE per |
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39 | * pixel if the output is grayscale or colormapped, three if it is full color. |
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40 | */ |
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41 | |||
42 | /* Private version of data destination object */ |
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43 | |||
44 | typedef struct { |
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45 | struct djpeg_dest_struct pub; /* public fields */ |
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46 | |||
47 | boolean is_os2; /* saves the OS2 format request flag */ |
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48 | |||
49 | jvirt_sarray_ptr whole_image; /* needed to reverse row order */ |
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50 | JDIMENSION data_width; /* JSAMPLEs per row */ |
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51 | JDIMENSION row_width; /* physical width of one row in the BMP file */ |
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52 | int pad_bytes; /* number of padding bytes needed per row */ |
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53 | JDIMENSION cur_output_row; /* next row# to write to virtual array */ |
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54 | } bmp_dest_struct; |
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55 | |||
56 | typedef bmp_dest_struct * bmp_dest_ptr; |
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57 | |||
58 | |||
59 | /* Forward declarations */ |
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60 | LOCAL(void) write_colormap |
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61 | JPP((j_decompress_ptr cinfo, bmp_dest_ptr dest, |
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62 | int map_colors, int map_entry_size)); |
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63 | |||
64 | |||
65 | /* |
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66 | * Write some pixel data. |
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67 | * In this module rows_supplied will always be 1. |
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68 | */ |
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69 | |||
70 | METHODDEF(void) |
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71 | put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
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72 | JDIMENSION rows_supplied) |
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73 | /* This version is for writing 24-bit pixels */ |
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74 | { |
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75 | bmp_dest_ptr dest = (bmp_dest_ptr) dinfo; |
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76 | JSAMPARRAY image_ptr; |
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77 | register JSAMPROW inptr, outptr; |
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78 | register JDIMENSION col; |
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79 | int pad; |
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80 | |||
81 | /* Access next row in virtual array */ |
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82 | image_ptr = (*cinfo->mem->access_virt_sarray) |
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83 | ((j_common_ptr) cinfo, dest->whole_image, |
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84 | dest->cur_output_row, (JDIMENSION) 1, TRUE); |
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85 | dest->cur_output_row++; |
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86 | |||
87 | /* Transfer data. Note destination values must be in BGR order |
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88 | * (even though Microsoft's own documents say the opposite). |
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89 | */ |
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90 | inptr = dest->pub.buffer[0]; |
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91 | outptr = image_ptr[0]; |
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92 | for (col = cinfo->output_width; col > 0; col--) { |
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93 | outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */ |
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94 | outptr[1] = *inptr++; |
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95 | outptr[0] = *inptr++; |
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96 | outptr += 3; |
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97 | } |
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98 | |||
99 | /* Zero out the pad bytes. */ |
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100 | pad = dest->pad_bytes; |
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101 | while (--pad >= 0) |
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102 | *outptr++ = 0; |
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103 | } |
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104 | |||
105 | METHODDEF(void) |
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106 | put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
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107 | JDIMENSION rows_supplied) |
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108 | /* This version is for grayscale OR quantized color output */ |
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109 | { |
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110 | bmp_dest_ptr dest = (bmp_dest_ptr) dinfo; |
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111 | JSAMPARRAY image_ptr; |
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112 | register JSAMPROW inptr, outptr; |
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113 | register JDIMENSION col; |
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114 | int pad; |
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115 | |||
116 | /* Access next row in virtual array */ |
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117 | image_ptr = (*cinfo->mem->access_virt_sarray) |
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118 | ((j_common_ptr) cinfo, dest->whole_image, |
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119 | dest->cur_output_row, (JDIMENSION) 1, TRUE); |
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120 | dest->cur_output_row++; |
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121 | |||
122 | /* Transfer data. */ |
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123 | inptr = dest->pub.buffer[0]; |
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124 | outptr = image_ptr[0]; |
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125 | for (col = cinfo->output_width; col > 0; col--) { |
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126 | *outptr++ = *inptr++; /* can omit GETJSAMPLE() safely */ |
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127 | } |
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128 | |||
129 | /* Zero out the pad bytes. */ |
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130 | pad = dest->pad_bytes; |
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131 | while (--pad >= 0) |
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132 | *outptr++ = 0; |
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133 | } |
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134 | |||
135 | |||
136 | /* |
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137 | * Startup: normally writes the file header. |
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138 | * In this module we may as well postpone everything until finish_output. |
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139 | */ |
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140 | |||
141 | METHODDEF(void) |
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142 | start_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
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143 | { |
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144 | /* no work here */ |
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145 | } |
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146 | |||
147 | |||
148 | /* |
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149 | * Finish up at the end of the file. |
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150 | * |
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151 | * Here is where we really output the BMP file. |
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152 | * |
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153 | * First, routines to write the Windows and OS/2 variants of the file header. |
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154 | */ |
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155 | |||
156 | LOCAL(void) |
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157 | write_bmp_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) |
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158 | /* Write a Windows-style BMP file header, including colormap if needed */ |
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159 | { |
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160 | char bmpfileheader[14]; |
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161 | char bmpinfoheader[40]; |
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162 | #define PUT_2B(array,offset,value) \ |
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163 | (array[offset] = (char) ((value) & 0xFF), \ |
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164 | array[offset+1] = (char) (((value) >> 8) & 0xFF)) |
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165 | #define PUT_4B(array,offset,value) \ |
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166 | (array[offset] = (char) ((value) & 0xFF), \ |
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167 | array[offset+1] = (char) (((value) >> 8) & 0xFF), \ |
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168 | array[offset+2] = (char) (((value) >> 16) & 0xFF), \ |
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169 | array[offset+3] = (char) (((value) >> 24) & 0xFF)) |
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170 | INT32 headersize, bfSize; |
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171 | int bits_per_pixel, cmap_entries; |
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172 | |||
173 | /* Compute colormap size and total file size */ |
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174 | if (cinfo->out_color_space == JCS_RGB) { |
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175 | if (cinfo->quantize_colors) { |
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176 | /* Colormapped RGB */ |
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177 | bits_per_pixel = 8; |
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178 | cmap_entries = 256; |
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179 | } else { |
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180 | /* Unquantized, full color RGB */ |
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181 | bits_per_pixel = 24; |
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182 | cmap_entries = 0; |
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183 | } |
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184 | } else { |
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185 | /* Grayscale output. We need to fake a 256-entry colormap. */ |
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186 | bits_per_pixel = 8; |
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187 | cmap_entries = 256; |
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188 | } |
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189 | /* File size */ |
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190 | headersize = 14 + 40 + cmap_entries * 4; /* Header and colormap */ |
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191 | bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; |
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192 | |||
193 | /* Set unused fields of header to 0 */ |
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194 | MEMZERO(bmpfileheader, SIZEOF(bmpfileheader)); |
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195 | MEMZERO(bmpinfoheader, SIZEOF(bmpinfoheader)); |
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196 | |||
197 | /* Fill the file header */ |
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198 | bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */ |
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199 | bmpfileheader[1] = 0x4D; |
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200 | PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */ |
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201 | /* we leave bfReserved1 & bfReserved2 = 0 */ |
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202 | PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */ |
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203 | |||
204 | /* Fill the info header (Microsoft calls this a BITMAPINFOHEADER) */ |
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205 | PUT_2B(bmpinfoheader, 0, 40); /* biSize */ |
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206 | PUT_4B(bmpinfoheader, 4, cinfo->output_width); /* biWidth */ |
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207 | PUT_4B(bmpinfoheader, 8, cinfo->output_height); /* biHeight */ |
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208 | PUT_2B(bmpinfoheader, 12, 1); /* biPlanes - must be 1 */ |
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209 | PUT_2B(bmpinfoheader, 14, bits_per_pixel); /* biBitCount */ |
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210 | /* we leave biCompression = 0, for none */ |
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211 | /* we leave biSizeImage = 0; this is correct for uncompressed data */ |
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212 | if (cinfo->density_unit == 2) { /* if have density in dots/cm, then */ |
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213 | PUT_4B(bmpinfoheader, 24, (INT32) (cinfo->X_density*100)); /* XPels/M */ |
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214 | PUT_4B(bmpinfoheader, 28, (INT32) (cinfo->Y_density*100)); /* XPels/M */ |
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215 | } |
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216 | PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */ |
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217 | /* we leave biClrImportant = 0 */ |
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218 | |||
219 | if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) |
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220 | ERREXIT(cinfo, JERR_FILE_WRITE); |
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221 | if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (size_t) 40) |
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222 | ERREXIT(cinfo, JERR_FILE_WRITE); |
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223 | |||
224 | if (cmap_entries > 0) |
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225 | write_colormap(cinfo, dest, cmap_entries, 4); |
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226 | } |
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227 | |||
228 | |||
229 | LOCAL(void) |
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230 | write_os2_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) |
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231 | /* Write an OS2-style BMP file header, including colormap if needed */ |
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232 | { |
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233 | char bmpfileheader[14]; |
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234 | char bmpcoreheader[12]; |
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235 | INT32 headersize, bfSize; |
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236 | int bits_per_pixel, cmap_entries; |
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237 | |||
238 | /* Compute colormap size and total file size */ |
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239 | if (cinfo->out_color_space == JCS_RGB) { |
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240 | if (cinfo->quantize_colors) { |
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241 | /* Colormapped RGB */ |
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242 | bits_per_pixel = 8; |
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243 | cmap_entries = 256; |
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244 | } else { |
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245 | /* Unquantized, full color RGB */ |
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246 | bits_per_pixel = 24; |
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247 | cmap_entries = 0; |
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248 | } |
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249 | } else { |
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250 | /* Grayscale output. We need to fake a 256-entry colormap. */ |
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251 | bits_per_pixel = 8; |
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252 | cmap_entries = 256; |
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253 | } |
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254 | /* File size */ |
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255 | headersize = 14 + 12 + cmap_entries * 3; /* Header and colormap */ |
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256 | bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; |
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257 | |||
258 | /* Set unused fields of header to 0 */ |
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259 | MEMZERO(bmpfileheader, SIZEOF(bmpfileheader)); |
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260 | MEMZERO(bmpcoreheader, SIZEOF(bmpcoreheader)); |
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261 | |||
262 | /* Fill the file header */ |
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263 | bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */ |
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264 | bmpfileheader[1] = 0x4D; |
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265 | PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */ |
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266 | /* we leave bfReserved1 & bfReserved2 = 0 */ |
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267 | PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */ |
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268 | |||
269 | /* Fill the info header (Microsoft calls this a BITMAPCOREHEADER) */ |
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270 | PUT_2B(bmpcoreheader, 0, 12); /* bcSize */ |
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271 | PUT_2B(bmpcoreheader, 4, cinfo->output_width); /* bcWidth */ |
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272 | PUT_2B(bmpcoreheader, 6, cinfo->output_height); /* bcHeight */ |
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273 | PUT_2B(bmpcoreheader, 8, 1); /* bcPlanes - must be 1 */ |
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274 | PUT_2B(bmpcoreheader, 10, bits_per_pixel); /* bcBitCount */ |
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275 | |||
276 | if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) |
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277 | ERREXIT(cinfo, JERR_FILE_WRITE); |
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278 | if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (size_t) 12) |
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279 | ERREXIT(cinfo, JERR_FILE_WRITE); |
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280 | |||
281 | if (cmap_entries > 0) |
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282 | write_colormap(cinfo, dest, cmap_entries, 3); |
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283 | } |
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284 | |||
285 | |||
286 | /* |
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287 | * Write the colormap. |
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288 | * Windows uses BGR0 map entries; OS/2 uses BGR entries. |
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289 | */ |
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290 | |||
291 | LOCAL(void) |
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292 | write_colormap (j_decompress_ptr cinfo, bmp_dest_ptr dest, |
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293 | int map_colors, int map_entry_size) |
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294 | { |
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295 | JSAMPARRAY colormap = cinfo->colormap; |
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296 | int num_colors = cinfo->actual_number_of_colors; |
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297 | FILE * outfile = dest->pub.output_file; |
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298 | int i; |
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299 | |||
300 | if (colormap != NULL) { |
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301 | if (cinfo->out_color_components == 3) { |
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302 | /* Normal case with RGB colormap */ |
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303 | for (i = 0; i < num_colors; i++) { |
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304 | putc(GETJSAMPLE(colormap[2][i]), outfile); |
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305 | putc(GETJSAMPLE(colormap[1][i]), outfile); |
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306 | putc(GETJSAMPLE(colormap[0][i]), outfile); |
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307 | if (map_entry_size == 4) |
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308 | putc(0, outfile); |
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309 | } |
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310 | } else { |
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311 | /* Grayscale colormap (only happens with grayscale quantization) */ |
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312 | for (i = 0; i < num_colors; i++) { |
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313 | putc(GETJSAMPLE(colormap[0][i]), outfile); |
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314 | putc(GETJSAMPLE(colormap[0][i]), outfile); |
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315 | putc(GETJSAMPLE(colormap[0][i]), outfile); |
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316 | if (map_entry_size == 4) |
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317 | putc(0, outfile); |
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318 | } |
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319 | } |
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320 | } else { |
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321 | /* If no colormap, must be grayscale data. Generate a linear "map". */ |
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322 | for (i = 0; i < 256; i++) { |
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323 | putc(i, outfile); |
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324 | putc(i, outfile); |
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325 | putc(i, outfile); |
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326 | if (map_entry_size == 4) |
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327 | putc(0, outfile); |
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328 | } |
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329 | } |
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330 | /* Pad colormap with zeros to ensure specified number of colormap entries */ |
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331 | if (i > map_colors) |
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332 | ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, i); |
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333 | for (; i < map_colors; i++) { |
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334 | putc(0, outfile); |
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335 | putc(0, outfile); |
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336 | putc(0, outfile); |
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337 | if (map_entry_size == 4) |
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338 | putc(0, outfile); |
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339 | } |
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340 | } |
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341 | |||
342 | |||
343 | METHODDEF(void) |
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344 | finish_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
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345 | { |
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346 | bmp_dest_ptr dest = (bmp_dest_ptr) dinfo; |
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347 | register FILE * outfile = dest->pub.output_file; |
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348 | JSAMPARRAY image_ptr; |
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349 | register JSAMPROW data_ptr; |
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350 | JDIMENSION row; |
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351 | register JDIMENSION col; |
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352 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
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353 | |||
354 | /* Write the header and colormap */ |
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355 | if (dest->is_os2) |
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356 | write_os2_header(cinfo, dest); |
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357 | else |
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358 | write_bmp_header(cinfo, dest); |
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359 | |||
360 | /* Write the file body from our virtual array */ |
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361 | for (row = cinfo->output_height; row > 0; row--) { |
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362 | if (progress != NULL) { |
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363 | progress->pub.pass_counter = (long) (cinfo->output_height - row); |
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364 | progress->pub.pass_limit = (long) cinfo->output_height; |
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365 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
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366 | } |
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367 | image_ptr = (*cinfo->mem->access_virt_sarray) |
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368 | ((j_common_ptr) cinfo, dest->whole_image, row-1, (JDIMENSION) 1, FALSE); |
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369 | data_ptr = image_ptr[0]; |
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370 | for (col = dest->row_width; col > 0; col--) { |
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371 | putc(GETJSAMPLE(*data_ptr), outfile); |
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372 | data_ptr++; |
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373 | } |
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374 | } |
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375 | if (progress != NULL) |
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376 | progress->completed_extra_passes++; |
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377 | |||
378 | /* Make sure we wrote the output file OK */ |
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379 | fflush(outfile); |
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380 | if (ferror(outfile)) |
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381 | ERREXIT(cinfo, JERR_FILE_WRITE); |
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382 | } |
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383 | |||
384 | |||
385 | /* |
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386 | * The module selection routine for BMP format output. |
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387 | */ |
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388 | |||
389 | GLOBAL(djpeg_dest_ptr) |
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390 | jinit_write_bmp (j_decompress_ptr cinfo, boolean is_os2) |
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391 | { |
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392 | bmp_dest_ptr dest; |
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393 | JDIMENSION row_width; |
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394 | |||
395 | /* Create module interface object, fill in method pointers */ |
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396 | dest = (bmp_dest_ptr) |
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397 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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398 | SIZEOF(bmp_dest_struct)); |
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399 | dest->pub.start_output = start_output_bmp; |
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400 | dest->pub.finish_output = finish_output_bmp; |
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401 | dest->is_os2 = is_os2; |
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402 | |||
403 | if (cinfo->out_color_space == JCS_GRAYSCALE) { |
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404 | dest->pub.put_pixel_rows = put_gray_rows; |
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405 | } else if (cinfo->out_color_space == JCS_RGB) { |
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406 | if (cinfo->quantize_colors) |
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407 | dest->pub.put_pixel_rows = put_gray_rows; |
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408 | else |
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409 | dest->pub.put_pixel_rows = put_pixel_rows; |
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410 | } else { |
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411 | ERREXIT(cinfo, JERR_BMP_COLORSPACE); |
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412 | } |
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413 | |||
414 | /* Calculate output image dimensions so we can allocate space */ |
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415 | jpeg_calc_output_dimensions(cinfo); |
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416 | |||
417 | /* Determine width of rows in the BMP file (padded to 4-byte boundary). */ |
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418 | row_width = cinfo->output_width * cinfo->output_components; |
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419 | dest->data_width = row_width; |
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420 | while ((row_width & 3) != 0) row_width++; |
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421 | dest->row_width = row_width; |
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422 | dest->pad_bytes = (int) (row_width - dest->data_width); |
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423 | |||
424 | /* Allocate space for inversion array, prepare for write pass */ |
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425 | dest->whole_image = (*cinfo->mem->request_virt_sarray) |
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426 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
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427 | row_width, cinfo->output_height, (JDIMENSION) 1); |
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428 | dest->cur_output_row = 0; |
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429 | if (cinfo->progress != NULL) { |
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430 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
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431 | progress->total_extra_passes++; /* count file input as separate pass */ |
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432 | } |
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433 | |||
434 | /* Create decompressor output buffer. */ |
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435 | dest->pub.buffer = (*cinfo->mem->alloc_sarray) |
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436 | ((j_common_ptr) cinfo, JPOOL_IMAGE, row_width, (JDIMENSION) 1); |
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437 | dest->pub.buffer_height = 1; |
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438 | |||
439 | return (djpeg_dest_ptr) dest; |
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440 | } |
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441 | |||
442 | #endif /* BMP_SUPPORTED */>>>> |