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00019 #include "cdjpeg.h"
00020
00021 #ifdef PPM_SUPPORTED
00022
00023
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00026
00027
00028
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00031
00032
00033
00034 #if BITS_IN_JSAMPLE == 8
00035 #define PUTPPMSAMPLE(ptr,v) *ptr++ = (char) (v)
00036 #define BYTESPERSAMPLE 1
00037 #define PPM_MAXVAL 255
00038 #else
00039 #ifdef PPM_NORAWWORD
00040 #define PUTPPMSAMPLE(ptr,v) *ptr++ = (char) ((v) >> (BITS_IN_JSAMPLE-8))
00041 #define BYTESPERSAMPLE 1
00042 #define PPM_MAXVAL 255
00043 #else
00044
00045 #define PUTPPMSAMPLE(ptr,v) \
00046 { register int val_ = v; \
00047 *ptr++ = (char) ((val_ >> 8) & 0xFF); \
00048 *ptr++ = (char) (val_ & 0xFF); \
00049 }
00050 #define BYTESPERSAMPLE 2
00051 #define PPM_MAXVAL ((1<<BITS_IN_JSAMPLE)-1)
00052 #endif
00053 #endif
00054
00055
00056
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00068
00069 typedef struct {
00070 struct djpeg_dest_struct pub;
00071
00072
00073 char *iobuffer;
00074 JSAMPROW pixrow;
00075 size_t buffer_width;
00076 JDIMENSION samples_per_row;
00077 } ppm_dest_struct;
00078
00079 typedef ppm_dest_struct * ppm_dest_ptr;
00080
00081
00082
00083
00084
00085
00086
00087
00088
00089
00090 METHODDEF(void)
00091 put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
00092 JDIMENSION rows_supplied)
00093 {
00094 ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
00095
00096 (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
00097 }
00098
00099
00100
00101
00102
00103
00104
00105 METHODDEF(void)
00106 copy_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
00107 JDIMENSION rows_supplied)
00108 {
00109 ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
00110 register char * bufferptr;
00111 register JSAMPROW ptr;
00112 register JDIMENSION col;
00113
00114 ptr = dest->pub.buffer[0];
00115 bufferptr = dest->iobuffer;
00116 for (col = dest->samples_per_row; col > 0; col--) {
00117 PUTPPMSAMPLE(bufferptr, GETJSAMPLE(*ptr++));
00118 }
00119 (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
00120 }
00121
00122
00123
00124
00125
00126
00127
00128 METHODDEF(void)
00129 put_demapped_rgb (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
00130 JDIMENSION rows_supplied)
00131 {
00132 ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
00133 register char * bufferptr;
00134 register int pixval;
00135 register JSAMPROW ptr;
00136 register JSAMPROW color_map0 = cinfo->colormap[0];
00137 register JSAMPROW color_map1 = cinfo->colormap[1];
00138 register JSAMPROW color_map2 = cinfo->colormap[2];
00139 register JDIMENSION col;
00140
00141 ptr = dest->pub.buffer[0];
00142 bufferptr = dest->iobuffer;
00143 for (col = cinfo->output_width; col > 0; col--) {
00144 pixval = GETJSAMPLE(*ptr++);
00145 PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map0[pixval]));
00146 PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map1[pixval]));
00147 PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map2[pixval]));
00148 }
00149 (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
00150 }
00151
00152
00153 METHODDEF(void)
00154 put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
00155 JDIMENSION rows_supplied)
00156 {
00157 ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
00158 register char * bufferptr;
00159 register JSAMPROW ptr;
00160 register JSAMPROW color_map = cinfo->colormap[0];
00161 register JDIMENSION col;
00162
00163 ptr = dest->pub.buffer[0];
00164 bufferptr = dest->iobuffer;
00165 for (col = cinfo->output_width; col > 0; col--) {
00166 PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map[GETJSAMPLE(*ptr++)]));
00167 }
00168 (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
00169 }
00170
00171
00172
00173
00174
00175
00176 METHODDEF(void)
00177 start_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
00178 {
00179 ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
00180
00181
00182 switch (cinfo->out_color_space) {
00183 case JCS_GRAYSCALE:
00184
00185 fprintf(dest->pub.output_file, "P5\n%ld %ld\n%d\n",
00186 (long) cinfo->output_width, (long) cinfo->output_height,
00187 PPM_MAXVAL);
00188 break;
00189 case JCS_RGB:
00190
00191 fprintf(dest->pub.output_file, "P6\n%ld %ld\n%d\n",
00192 (long) cinfo->output_width, (long) cinfo->output_height,
00193 PPM_MAXVAL);
00194 break;
00195 default:
00196 ERREXIT(cinfo, JERR_PPM_COLORSPACE);
00197 }
00198 }
00199
00200
00201
00202
00203
00204
00205 METHODDEF(void)
00206 finish_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
00207 {
00208
00209 fflush(dinfo->output_file);
00210 if (ferror(dinfo->output_file))
00211 ERREXIT(cinfo, JERR_FILE_WRITE);
00212 }
00213
00214
00215
00216
00217
00218
00219 GLOBAL(djpeg_dest_ptr)
00220 jinit_write_ppm (j_decompress_ptr cinfo)
00221 {
00222 ppm_dest_ptr dest;
00223
00224
00225 dest = (ppm_dest_ptr)
00226 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
00227 SIZEOF(ppm_dest_struct));
00228 dest->pub.start_output = start_output_ppm;
00229 dest->pub.finish_output = finish_output_ppm;
00230
00231
00232 jpeg_calc_output_dimensions(cinfo);
00233
00234
00235 dest->samples_per_row = cinfo->output_width * cinfo->out_color_components;
00236 dest->buffer_width = dest->samples_per_row * (BYTESPERSAMPLE * SIZEOF(char));
00237 dest->iobuffer = (char *) (*cinfo->mem->alloc_small)
00238 ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width);
00239
00240 if (cinfo->quantize_colors || BITS_IN_JSAMPLE != 8 ||
00241 SIZEOF(JSAMPLE) != SIZEOF(char)) {
00242
00243
00244
00245
00246 dest->pub.buffer = (*cinfo->mem->alloc_sarray)
00247 ((j_common_ptr) cinfo, JPOOL_IMAGE,
00248 cinfo->output_width * cinfo->output_components, (JDIMENSION) 1);
00249 dest->pub.buffer_height = 1;
00250 if (! cinfo->quantize_colors)
00251 dest->pub.put_pixel_rows = copy_pixel_rows;
00252 else if (cinfo->out_color_space == JCS_GRAYSCALE)
00253 dest->pub.put_pixel_rows = put_demapped_gray;
00254 else
00255 dest->pub.put_pixel_rows = put_demapped_rgb;
00256 } else {
00257
00258
00259
00260 dest->pixrow = (JSAMPROW) dest->iobuffer;
00261 dest->pub.buffer = & dest->pixrow;
00262 dest->pub.buffer_height = 1;
00263 dest->pub.put_pixel_rows = put_pixel_rows;
00264 }
00265
00266 return (djpeg_dest_ptr) dest;
00267 }
00268
00269 #endif