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- #include "cmyk.h"
- #include "cdjpeg.h"
- #ifdef PPM_SUPPORTED
- #ifdef HAVE_UNSIGNED_CHAR
- typedef unsigned char U_CHAR;
- #define UCH(x) ((int)(x))
- #else
- #ifdef __CHAR_UNSIGNED__
- typedef char U_CHAR;
- #define UCH(x) ((int)(x))
- #else
- typedef char U_CHAR;
- #define UCH(x) ((int)(x) & 0xFF)
- #endif
- #endif
- #define ReadOK(file, buffer, len) \
- (JFREAD(file, buffer, len) == ((size_t)(len)))
- static int alpha_index[JPEG_NUMCS] = {
- -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1
- };
- typedef struct {
- struct cjpeg_source_struct pub;
-
- U_CHAR *iobuffer;
- JSAMPROW pixrow;
- size_t buffer_width;
- JSAMPLE *rescale;
- unsigned int maxval;
- } ppm_source_struct;
- typedef ppm_source_struct *ppm_source_ptr;
- LOCAL(int)
- pbm_getc(FILE *infile)
- {
- register int ch;
- ch = getc(infile);
- if (ch == '#') {
- do {
- ch = getc(infile);
- } while (ch != '\n' && ch != EOF);
- }
- return ch;
- }
- LOCAL(unsigned int)
- read_pbm_integer(j_compress_ptr cinfo, FILE *infile, unsigned int maxval)
- {
- register int ch;
- register unsigned int val;
-
- do {
- ch = pbm_getc(infile);
- if (ch == EOF)
- ERREXIT(cinfo, JERR_INPUT_EOF);
- } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
- if (ch < '0' || ch > '9')
- ERREXIT(cinfo, JERR_PPM_NONNUMERIC);
- val = ch - '0';
- while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') {
- val *= 10;
- val += ch - '0';
- }
- if (val > maxval)
- ERREXIT(cinfo, JERR_PPM_OUTOFRANGE);
- return val;
- }
- METHODDEF(JDIMENSION)
- get_text_gray_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- FILE *infile = source->pub.input_file;
- register JSAMPROW ptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- ptr = source->pub.buffer[0];
- for (col = cinfo->image_width; col > 0; col--) {
- *ptr++ = rescale[read_pbm_integer(cinfo, infile, maxval)];
- }
- return 1;
- }
- #define GRAY_RGB_READ_LOOP(read_op, alpha_set_op) { \
- for (col = cinfo->image_width; col > 0; col--) { \
- ptr[rindex] = ptr[gindex] = ptr[bindex] = read_op; \
- alpha_set_op \
- ptr += ps; \
- } \
- }
- METHODDEF(JDIMENSION)
- get_text_gray_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- FILE *infile = source->pub.input_file;
- register JSAMPROW ptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- register int rindex = rgb_red[cinfo->in_color_space];
- register int gindex = rgb_green[cinfo->in_color_space];
- register int bindex = rgb_blue[cinfo->in_color_space];
- register int aindex = alpha_index[cinfo->in_color_space];
- register int ps = rgb_pixelsize[cinfo->in_color_space];
- ptr = source->pub.buffer[0];
- if (maxval == MAXJSAMPLE) {
- if (aindex >= 0)
- GRAY_RGB_READ_LOOP(read_pbm_integer(cinfo, infile, maxval),
- ptr[aindex] = 0xFF;)
- else
- GRAY_RGB_READ_LOOP(read_pbm_integer(cinfo, infile, maxval),)
- } else {
- if (aindex >= 0)
- GRAY_RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)],
- ptr[aindex] = 0xFF;)
- else
- GRAY_RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)],)
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_text_gray_cmyk_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- FILE *infile = source->pub.input_file;
- register JSAMPROW ptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- ptr = source->pub.buffer[0];
- if (maxval == MAXJSAMPLE) {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE gray = read_pbm_integer(cinfo, infile, maxval);
- rgb_to_cmyk(gray, gray, gray, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- } else {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE gray = rescale[read_pbm_integer(cinfo, infile, maxval)];
- rgb_to_cmyk(gray, gray, gray, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- }
- return 1;
- }
- #define RGB_READ_LOOP(read_op, alpha_set_op) { \
- for (col = cinfo->image_width; col > 0; col--) { \
- ptr[rindex] = read_op; \
- ptr[gindex] = read_op; \
- ptr[bindex] = read_op; \
- alpha_set_op \
- ptr += ps; \
- } \
- }
- METHODDEF(JDIMENSION)
- get_text_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- FILE *infile = source->pub.input_file;
- register JSAMPROW ptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- register int rindex = rgb_red[cinfo->in_color_space];
- register int gindex = rgb_green[cinfo->in_color_space];
- register int bindex = rgb_blue[cinfo->in_color_space];
- register int aindex = alpha_index[cinfo->in_color_space];
- register int ps = rgb_pixelsize[cinfo->in_color_space];
- ptr = source->pub.buffer[0];
- if (maxval == MAXJSAMPLE) {
- if (aindex >= 0)
- RGB_READ_LOOP(read_pbm_integer(cinfo, infile, maxval),
- ptr[aindex] = 0xFF;)
- else
- RGB_READ_LOOP(read_pbm_integer(cinfo, infile, maxval),)
- } else {
- if (aindex >= 0)
- RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)],
- ptr[aindex] = 0xFF;)
- else
- RGB_READ_LOOP(rescale[read_pbm_integer(cinfo, infile, maxval)],)
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_text_rgb_cmyk_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- FILE *infile = source->pub.input_file;
- register JSAMPROW ptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- ptr = source->pub.buffer[0];
- if (maxval == MAXJSAMPLE) {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE r = read_pbm_integer(cinfo, infile, maxval);
- JSAMPLE g = read_pbm_integer(cinfo, infile, maxval);
- JSAMPLE b = read_pbm_integer(cinfo, infile, maxval);
- rgb_to_cmyk(r, g, b, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- } else {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE r = rescale[read_pbm_integer(cinfo, infile, maxval)];
- JSAMPLE g = rescale[read_pbm_integer(cinfo, infile, maxval)];
- JSAMPLE b = rescale[read_pbm_integer(cinfo, infile, maxval)];
- rgb_to_cmyk(r, g, b, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_scaled_gray_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- for (col = cinfo->image_width; col > 0; col--) {
- *ptr++ = rescale[UCH(*bufferptr++)];
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_gray_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- register int rindex = rgb_red[cinfo->in_color_space];
- register int gindex = rgb_green[cinfo->in_color_space];
- register int bindex = rgb_blue[cinfo->in_color_space];
- register int aindex = alpha_index[cinfo->in_color_space];
- register int ps = rgb_pixelsize[cinfo->in_color_space];
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- if (maxval == MAXJSAMPLE) {
- if (aindex >= 0)
- GRAY_RGB_READ_LOOP(*bufferptr++, ptr[aindex] = 0xFF;)
- else
- GRAY_RGB_READ_LOOP(*bufferptr++,)
- } else {
- if (aindex >= 0)
- GRAY_RGB_READ_LOOP(rescale[UCH(*bufferptr++)], ptr[aindex] = 0xFF;)
- else
- GRAY_RGB_READ_LOOP(rescale[UCH(*bufferptr++)],)
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_gray_cmyk_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- if (maxval == MAXJSAMPLE) {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE gray = *bufferptr++;
- rgb_to_cmyk(gray, gray, gray, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- } else {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE gray = rescale[UCH(*bufferptr++)];
- rgb_to_cmyk(gray, gray, gray, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- register int rindex = rgb_red[cinfo->in_color_space];
- register int gindex = rgb_green[cinfo->in_color_space];
- register int bindex = rgb_blue[cinfo->in_color_space];
- register int aindex = alpha_index[cinfo->in_color_space];
- register int ps = rgb_pixelsize[cinfo->in_color_space];
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- if (maxval == MAXJSAMPLE) {
- if (aindex >= 0)
- RGB_READ_LOOP(*bufferptr++, ptr[aindex] = 0xFF;)
- else
- RGB_READ_LOOP(*bufferptr++,)
- } else {
- if (aindex >= 0)
- RGB_READ_LOOP(rescale[UCH(*bufferptr++)], ptr[aindex] = 0xFF;)
- else
- RGB_READ_LOOP(rescale[UCH(*bufferptr++)],)
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_rgb_cmyk_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- if (maxval == MAXJSAMPLE) {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE r = *bufferptr++;
- JSAMPLE g = *bufferptr++;
- JSAMPLE b = *bufferptr++;
- rgb_to_cmyk(r, g, b, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- } else {
- for (col = cinfo->image_width; col > 0; col--) {
- JSAMPLE r = rescale[UCH(*bufferptr++)];
- JSAMPLE g = rescale[UCH(*bufferptr++)];
- JSAMPLE b = rescale[UCH(*bufferptr++)];
- rgb_to_cmyk(r, g, b, ptr, ptr + 1, ptr + 2, ptr + 3);
- ptr += 4;
- }
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_raw_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_word_gray_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- for (col = cinfo->image_width; col > 0; col--) {
- register unsigned int temp;
- temp = UCH(*bufferptr++) << 8;
- temp |= UCH(*bufferptr++);
- if (temp > maxval)
- ERREXIT(cinfo, JERR_PPM_OUTOFRANGE);
- *ptr++ = rescale[temp];
- }
- return 1;
- }
- METHODDEF(JDIMENSION)
- get_word_rgb_row(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- register JSAMPROW ptr;
- register U_CHAR *bufferptr;
- register JSAMPLE *rescale = source->rescale;
- JDIMENSION col;
- unsigned int maxval = source->maxval;
- if (!ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
- ERREXIT(cinfo, JERR_INPUT_EOF);
- ptr = source->pub.buffer[0];
- bufferptr = source->iobuffer;
- for (col = cinfo->image_width; col > 0; col--) {
- register unsigned int temp;
- temp = UCH(*bufferptr++) << 8;
- temp |= UCH(*bufferptr++);
- if (temp > maxval)
- ERREXIT(cinfo, JERR_PPM_OUTOFRANGE);
- *ptr++ = rescale[temp];
- temp = UCH(*bufferptr++) << 8;
- temp |= UCH(*bufferptr++);
- if (temp > maxval)
- ERREXIT(cinfo, JERR_PPM_OUTOFRANGE);
- *ptr++ = rescale[temp];
- temp = UCH(*bufferptr++) << 8;
- temp |= UCH(*bufferptr++);
- if (temp > maxval)
- ERREXIT(cinfo, JERR_PPM_OUTOFRANGE);
- *ptr++ = rescale[temp];
- }
- return 1;
- }
- METHODDEF(void)
- start_input_ppm(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
- ppm_source_ptr source = (ppm_source_ptr)sinfo;
- int c;
- unsigned int w, h, maxval;
- boolean need_iobuffer, use_raw_buffer, need_rescale;
- if (getc(source->pub.input_file) != 'P')
- ERREXIT(cinfo, JERR_PPM_NOT);
- c = getc(source->pub.input_file);
-
- switch (c) {
- case '2':
- case '3':
- case '5':
- case '6':
- break;
- default:
- ERREXIT(cinfo, JERR_PPM_NOT);
- break;
- }
-
- w = read_pbm_integer(cinfo, source->pub.input_file, 65535);
- h = read_pbm_integer(cinfo, source->pub.input_file, 65535);
- maxval = read_pbm_integer(cinfo, source->pub.input_file, 65535);
- if (w <= 0 || h <= 0 || maxval <= 0)
- ERREXIT(cinfo, JERR_PPM_NOT);
- cinfo->data_precision = BITS_IN_JSAMPLE;
- cinfo->image_width = (JDIMENSION)w;
- cinfo->image_height = (JDIMENSION)h;
- source->maxval = maxval;
-
- need_iobuffer = TRUE;
- use_raw_buffer = FALSE;
- need_rescale = TRUE;
- switch (c) {
- case '2':
- if (cinfo->in_color_space == JCS_UNKNOWN)
- cinfo->in_color_space = JCS_GRAYSCALE;
- TRACEMS2(cinfo, 1, JTRC_PGM_TEXT, w, h);
- if (cinfo->in_color_space == JCS_GRAYSCALE)
- source->pub.get_pixel_rows = get_text_gray_row;
- else if (IsExtRGB(cinfo->in_color_space))
- source->pub.get_pixel_rows = get_text_gray_rgb_row;
- else if (cinfo->in_color_space == JCS_CMYK)
- source->pub.get_pixel_rows = get_text_gray_cmyk_row;
- else
- ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
- need_iobuffer = FALSE;
- break;
- case '3':
- if (cinfo->in_color_space == JCS_UNKNOWN)
- cinfo->in_color_space = JCS_EXT_RGB;
- TRACEMS2(cinfo, 1, JTRC_PPM_TEXT, w, h);
- if (IsExtRGB(cinfo->in_color_space))
- source->pub.get_pixel_rows = get_text_rgb_row;
- else if (cinfo->in_color_space == JCS_CMYK)
- source->pub.get_pixel_rows = get_text_rgb_cmyk_row;
- else
- ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
- need_iobuffer = FALSE;
- break;
- case '5':
- if (cinfo->in_color_space == JCS_UNKNOWN)
- cinfo->in_color_space = JCS_GRAYSCALE;
- TRACEMS2(cinfo, 1, JTRC_PGM, w, h);
- if (maxval > 255) {
- source->pub.get_pixel_rows = get_word_gray_row;
- } else if (maxval == MAXJSAMPLE && sizeof(JSAMPLE) == sizeof(U_CHAR) &&
- cinfo->in_color_space == JCS_GRAYSCALE) {
- source->pub.get_pixel_rows = get_raw_row;
- use_raw_buffer = TRUE;
- need_rescale = FALSE;
- } else {
- if (cinfo->in_color_space == JCS_GRAYSCALE)
- source->pub.get_pixel_rows = get_scaled_gray_row;
- else if (IsExtRGB(cinfo->in_color_space))
- source->pub.get_pixel_rows = get_gray_rgb_row;
- else if (cinfo->in_color_space == JCS_CMYK)
- source->pub.get_pixel_rows = get_gray_cmyk_row;
- else
- ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
- }
- break;
- case '6':
- if (cinfo->in_color_space == JCS_UNKNOWN)
- cinfo->in_color_space = JCS_EXT_RGB;
- TRACEMS2(cinfo, 1, JTRC_PPM, w, h);
- if (maxval > 255) {
- source->pub.get_pixel_rows = get_word_rgb_row;
- } else if (maxval == MAXJSAMPLE && sizeof(JSAMPLE) == sizeof(U_CHAR) &&
- (cinfo->in_color_space == JCS_EXT_RGB
- #if RGB_RED == 0 && RGB_GREEN == 1 && RGB_BLUE == 2 && RGB_PIXELSIZE == 3
- || cinfo->in_color_space == JCS_RGB
- #endif
- )) {
- source->pub.get_pixel_rows = get_raw_row;
- use_raw_buffer = TRUE;
- need_rescale = FALSE;
- } else {
- if (IsExtRGB(cinfo->in_color_space))
- source->pub.get_pixel_rows = get_rgb_row;
- else if (cinfo->in_color_space == JCS_CMYK)
- source->pub.get_pixel_rows = get_rgb_cmyk_row;
- else
- ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
- }
- break;
- }
- if (IsExtRGB(cinfo->in_color_space))
- cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
- else if (cinfo->in_color_space == JCS_GRAYSCALE)
- cinfo->input_components = 1;
- else if (cinfo->in_color_space == JCS_CMYK)
- cinfo->input_components = 4;
-
- if (need_iobuffer) {
- if (c == '6')
- source->buffer_width = (size_t)w * 3 *
- ((maxval <= 255) ? sizeof(U_CHAR) : (2 * sizeof(U_CHAR)));
- else
- source->buffer_width = (size_t)w *
- ((maxval <= 255) ? sizeof(U_CHAR) : (2 * sizeof(U_CHAR)));
- source->iobuffer = (U_CHAR *)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- source->buffer_width);
- }
-
- if (use_raw_buffer) {
-
-
- source->pixrow = (JSAMPROW)source->iobuffer;
- source->pub.buffer = &source->pixrow;
- source->pub.buffer_height = 1;
- } else {
-
- source->pub.buffer = (*cinfo->mem->alloc_sarray)
- ((j_common_ptr)cinfo, JPOOL_IMAGE,
- (JDIMENSION)w * cinfo->input_components, (JDIMENSION)1);
- source->pub.buffer_height = 1;
- }
-
- if (need_rescale) {
- long val, half_maxval;
-
- source->rescale = (JSAMPLE *)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- (size_t)(((long)MAX(maxval, 255) + 1L) *
- sizeof(JSAMPLE)));
- half_maxval = maxval / 2;
- for (val = 0; val <= (long)maxval; val++) {
-
- source->rescale[val] = (JSAMPLE)((val * MAXJSAMPLE + half_maxval) /
- maxval);
- }
- }
- }
- METHODDEF(void)
- finish_input_ppm(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
- {
-
- }
- GLOBAL(cjpeg_source_ptr)
- jinit_read_ppm(j_compress_ptr cinfo)
- {
- ppm_source_ptr source;
-
- source = (ppm_source_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- sizeof(ppm_source_struct));
-
- source->pub.start_input = start_input_ppm;
- source->pub.finish_input = finish_input_ppm;
- return (cjpeg_source_ptr)source;
- }
- #endif
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