/*
* wrppm.c
*
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1991-1996, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* libjpeg-turbo Modifications:
* Copyright (C) 2017, 2019, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
* This file contains routines to write output images in PPM/PGM format.
* The extended 2-byte-per-sample raw PPM/PGM formats are supported.
* The PBMPLUS library is NOT required to compile this software
* (but it is highly useful as a set of PPM image manipulation programs).
*
* These routines may need modification for non-Unix environments or
* specialized applications. As they stand, they assume output to
* an ordinary stdio stream.
*/
#include "cmyk.h"
#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
#ifdef PPM_SUPPORTED
/*
* For 12-bit JPEG data, we either downscale the values to 8 bits
* (to write standard byte-per-sample PPM/PGM files), or output
* nonstandard word-per-sample PPM/PGM files. Downscaling is done
* if PPM_NORAWWORD is defined (this can be done in the Makefile
* or in jconfig.h).
* (When the core library supports data precision reduction, a cleaner
* implementation will be to ask for that instead.)
*/
#if BITS_IN_JSAMPLE == 8
#define PUTPPMSAMPLE(ptr, v) *ptr++ = (char)(v)
#define BYTESPERSAMPLE 1
#define PPM_MAXVAL 255
#else
#ifdef PPM_NORAWWORD
#define PUTPPMSAMPLE(ptr, v) *ptr++ = (char)((v) >> (BITS_IN_JSAMPLE - 8))
#define BYTESPERSAMPLE 1
#define PPM_MAXVAL 255
#else
/* The word-per-sample format always puts the MSB first. */
#define PUTPPMSAMPLE(ptr, v) { \
register int val_ = v; \
*ptr++ = (char)((val_ >> 8) & 0xFF); \
*ptr++ = (char)(val_ & 0xFF); \
}
#define BYTESPERSAMPLE 2
#define PPM_MAXVAL ((1 << BITS_IN_JSAMPLE) - 1)
#endif
#endif
/*
* When JSAMPLE is the same size as char, we can just fwrite() the
* decompressed data to the PPM or PGM file.
*/
/* Private version of data destination object */
typedef struct {
struct djpeg_dest_struct pub; /* public fields */
/* Usually these two pointers point to the same place: */
char *iobuffer; /* fwrite's I/O buffer */
JSAMPROW pixrow; /* decompressor output buffer */
size_t buffer_width; /* width of I/O buffer */
JDIMENSION samples_per_row; /* JSAMPLEs per output row */
} ppm_dest_struct;
typedef ppm_dest_struct *ppm_dest_ptr;
/*
* Write some pixel data.
* In this module rows_supplied will always be 1.
*
* put_pixel_rows handles the "normal" 8-bit case where the decompressor
* output buffer is physically the same as the fwrite buffer.
*/
METHODDEF(void)
put_pixel_rows(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
JDIMENSION rows_supplied)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
(void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
}
/*
* This code is used when we have to copy the data and apply a pixel
* format translation. Typically this only happens in 12-bit mode.
*/
METHODDEF(void)
copy_pixel_rows(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
JDIMENSION rows_supplied)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
register char *bufferptr;
register JSAMPROW ptr;
#if BITS_IN_JSAMPLE != 8 || (!defined(HAVE_UNSIGNED_CHAR) && !defined(__CHAR_UNSIGNED__))
register JDIMENSION col;
#endif
ptr = dest->pub.buffer[0];
bufferptr = dest->iobuffer;
#if BITS_IN_JSAMPLE == 8 && (defined(HAVE_UNSIGNED_CHAR) || defined(__CHAR_UNSIGNED__))
MEMCOPY(bufferptr, ptr, dest->samples_per_row);
#else
for (col = dest->samples_per_row; col > 0; col--) {
PUTPPMSAMPLE(bufferptr, GETJSAMPLE(*ptr++));
}
#endif
(void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
}
/*
* Convert extended RGB to RGB.
*/
METHODDEF(void)
put_rgb(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, JDIMENSION rows_supplied)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
register char *bufferptr;
register JSAMPROW ptr;
register JDIMENSION col;
register int rindex = rgb_red[cinfo->out_color_space];
register int gindex = rgb_green[cinfo->out_color_space];
register int bindex = rgb_blue[cinfo->out_color_space];
register int ps = rgb_pixelsize[cinfo->out_color_space];
ptr = dest->pub.buffer[0];
bufferptr = dest->iobuffer;
for (col = cinfo->output_width; col > 0; col--) {
PUTPPMSAMPLE(bufferptr, ptr[rindex]);
PUTPPMSAMPLE(bufferptr, ptr[gindex]);
PUTPPMSAMPLE(bufferptr, ptr[bindex]);
ptr += ps;
}
(void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
}
/*
* Convert CMYK to RGB.
*/
METHODDEF(void)
put_cmyk(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
JDIMENSION rows_supplied)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
register char *bufferptr;
register JSAMPROW ptr;
register JDIMENSION col;
ptr = dest->pub.buffer[0];
bufferptr = dest->iobuffer;
for (col = cinfo->output_width; col > 0; col--) {
JSAMPLE r, g, b, c = *ptr++, m = *ptr++, y = *ptr++, k = *ptr++;
cmyk_to_rgb(c, m, y, k, &r, &g, &b);
PUTPPMSAMPLE(bufferptr, r);
PUTPPMSAMPLE(bufferptr, g);
PUTPPMSAMPLE(bufferptr, b);
}
(void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
}
/*
* Write some pixel data when color quantization is in effect.
* We have to demap the color index values to straight data.
*/
METHODDEF(void)
put_demapped_rgb(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
JDIMENSION rows_supplied)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
register char *bufferptr;
register int pixval;
register JSAMPROW ptr;
register JSAMPROW color_map0 = cinfo->colormap[0];
register JSAMPROW color_map1 = cinfo->colormap[1];
register JSAMPROW color_map2 = cinfo->colormap[2];
register JDIMENSION col;
ptr = dest->pub.buffer[0];
bufferptr = dest->iobuffer;
for (col = cinfo->output_width; col > 0; col--) {
pixval = GETJSAMPLE(*ptr++);
PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map0[pixval]));
PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map1[pixval]));
PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map2[pixval]));
}
(void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
}
METHODDEF(void)
put_demapped_gray(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
JDIMENSION rows_supplied)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
register char *bufferptr;
register JSAMPROW ptr;
register JSAMPROW color_map = cinfo->colormap[0];
register JDIMENSION col;
ptr = dest->pub.buffer[0];
bufferptr = dest->iobuffer;
for (col = cinfo->output_width; col > 0; col--) {
PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map[GETJSAMPLE(*ptr++)]));
}
(void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
}
/*
* Startup: write the file header.
*/
METHODDEF(void)
start_output_ppm(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
/* Emit file header */
switch (cinfo->out_color_space) {
case JCS_GRAYSCALE:
/* emit header for raw PGM format */
fprintf(dest->pub.output_file, "P5\n%ld %ld\n%d\n",
(long)cinfo->output_width, (long)cinfo->output_height, PPM_MAXVAL);
break;
case JCS_RGB:
case JCS_EXT_RGB:
case JCS_EXT_RGBX:
case JCS_EXT_BGR:
case JCS_EXT_BGRX:
case JCS_EXT_XBGR:
case JCS_EXT_XRGB:
case JCS_EXT_RGBA:
case JCS_EXT_BGRA:
case JCS_EXT_ABGR:
case JCS_EXT_ARGB:
case JCS_CMYK:
if (!IsExtRGB(cinfo->out_color_space) && cinfo->quantize_colors)
ERREXIT(cinfo, JERR_PPM_COLORSPACE);
/* emit header for raw PPM format */
fprintf(dest->pub.output_file, "P6\n%ld %ld\n%d\n",
(long)cinfo->output_width, (long)cinfo->output_height, PPM_MAXVAL);
break;
default:
ERREXIT(cinfo, JERR_PPM_COLORSPACE);
}
}
/*
* Finish up at the end of the file.
*/
METHODDEF(void)
finish_output_ppm(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
{
/* Make sure we wrote the output file OK */
fflush(dinfo->output_file);
if (ferror(dinfo->output_file))
ERREXIT(cinfo, JERR_FILE_WRITE);
}
/*
* Re-calculate buffer dimensions based on output dimensions.
*/
METHODDEF(void)
calc_buffer_dimensions_ppm(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
{
ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;
if (cinfo->out_color_space == JCS_GRAYSCALE)
dest->samples_per_row = cinfo->output_width * cinfo->out_color_components;
else
dest->samples_per_row = cinfo->output_width * 3;
dest->buffer_width = dest->samples_per_row * (BYTESPERSAMPLE * sizeof(char));
}
/*
* The module selection routine for PPM format output.
*/
GLOBAL(djpeg_dest_ptr)
jinit_write_ppm(j_decompress_ptr cinfo)
{
ppm_dest_ptr dest;
/* Create module interface object, fill in method pointers */
dest = (ppm_dest_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
sizeof(ppm_dest_struct));
dest->pub.start_output = start_output_ppm;
dest->pub.finish_output = finish_output_ppm;
dest->pub.calc_buffer_dimensions = calc_buffer_dimensions_ppm;
/* Calculate output image dimensions so we can allocate space */
jpeg_calc_output_dimensions(cinfo);
/* Create physical I/O buffer */
dest->pub.calc_buffer_dimensions(cinfo, (djpeg_dest_ptr)dest);
dest->iobuffer = (char *)(*cinfo->mem->alloc_small)
((j_common_ptr)cinfo, JPOOL_IMAGE, dest->buffer_width);
if (cinfo->quantize_colors || BITS_IN_JSAMPLE != 8 ||
sizeof(JSAMPLE) != sizeof(char) ||
(cinfo->out_color_space != JCS_EXT_RGB
#if RGB_RED == 0 && RGB_GREEN == 1 && RGB_BLUE == 2 && RGB_PIXELSIZE == 3
&& cinfo->out_color_space != JCS_RGB
#endif
)) {
/* When quantizing, we need an output buffer for colormap indexes
* that's separate from the physical I/O buffer. We also need a
* separate buffer if pixel format translation must take place.
*/
dest->pub.buffer = (*cinfo->mem->alloc_sarray)
((j_common_ptr)cinfo, JPOOL_IMAGE,
cinfo->output_width * cinfo->output_components, (JDIMENSION)1);
dest->pub.buffer_height = 1;
if (!cinfo->quantize_colors) {
if (IsExtRGB(cinfo->out_color_space))
dest->pub.put_pixel_rows = put_rgb;
else if (cinfo->out_color_space == JCS_CMYK)
dest->pub.put_pixel_rows = put_cmyk;
else
dest->pub.put_pixel_rows = copy_pixel_rows;
} else if (cinfo->out_color_space == JCS_GRAYSCALE)
dest->pub.put_pixel_rows = put_demapped_gray;
else
dest->pub.put_pixel_rows = put_demapped_rgb;
} else {
/* We will fwrite() directly from decompressor output buffer. */
/* Synthesize a JSAMPARRAY pointer structure */
dest->pixrow = (JSAMPROW)dest->iobuffer;
dest->pub.buffer = &dest->pixrow;
dest->pub.buffer_height = 1;
dest->pub.put_pixel_rows = put_pixel_rows;
}
return (djpeg_dest_ptr)dest;
}
#endif /* PPM_SUPPORTED */