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/* See LICENSE file for copyright and license details. */
#include <arpa/inet.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jpeglib.h>
#include <lcms2.h>
static char *argv0;
/* ROMM RGB primaries (ISO 22028-2:2013) */
static cmsCIExyYTRIPLE primaries = {
/* x, y, Y */
{ 0.7347, 0.2653, 0.288040 }, /* red */
{ 0.1596, 0.8404, 0.711874 }, /* green */
{ 0.0366, 0.0001, 0.000086 }, /* blue */
};
METHODDEF(void)
jpeg_error(j_common_ptr cinfo)
{
fprintf(stderr, "%s: libjpeg: ", argv0);
(*cinfo->err->output_message)(cinfo);
exit(1);
}
int
main(int argc, char *argv[])
{
cmsHPROFILE in_profile = NULL, out_profile;
cmsHTRANSFORM transform;
cmsToneCurve *gamma10, *out_curves[3];
struct jpeg_decompress_struct cinfo;
jpeg_saved_marker_ptr marker;
struct jpeg_error_mgr jerr;
uint32_t width, height, val_be;
uint16_t *ff_row;
size_t jpeg_row_len, ff_row_len, i, dx, sx;
JSAMPARRAY buffer; /* output row buffer */
argv0 = argv[0], argc--, argv++;
if (argc > 1) {
fprintf(stderr, "usage: %s\n", argv0);
return 1;
}
/* load jpg */
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = jpeg_error;
jpeg_create_decompress(&cinfo);
jpeg_save_markers(&cinfo, JPEG_APP0 + 1, 0xffff); /* exif data */
jpeg_save_markers(&cinfo, JPEG_APP0 + 2, 0xffff); /* icc data */
jpeg_stdio_src(&cinfo, stdin);
jpeg_read_header(&cinfo, TRUE);
width = cinfo.image_width;
height = cinfo.image_height;
/* set output format */
cinfo.output_components = 3; /* color components per pixel */
cinfo.out_color_space = JCS_RGB; /* input color space */
/* extract metadata */
marker = cinfo.marker_list;
for(; marker; marker = marker->next) {
if (!marker->data || !marker->data_length)
continue;
if (marker->marker == JPEG_APP0 + 1) {
/* exif data marker */
/* todo: Should we handle icc data from exif? */
} else if (marker->marker == JPEG_APP0 + 2) {
/* icc data marker */
if (!(in_profile = cmsOpenProfileFromMem(
marker->data + 14,
marker->data_length - 14)))
goto lcmserr;
}
}
jpeg_start_decompress(&cinfo);
jpeg_row_len = width * cinfo.output_components;
/* create output buffers */
buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr)&cinfo,
JPOOL_IMAGE, jpeg_row_len, 1);
ff_row_len = strlen("RGBA") * width;
if(!(ff_row = malloc(ff_row_len * sizeof(uint16_t)))) {
fprintf(stderr, "%s: malloc: out of memory\n", argv0);
return 1;
}
/* icc profile (output linear ROMM RGB (ISO 22028-2:2013)) */
if (!in_profile && !(in_profile = cmsCreate_sRGBProfile()))
goto lcmserr;
if (!(gamma10 = cmsBuildGamma(NULL, 1.0)))
goto lcmserr;
out_curves[0] = out_curves[1] = out_curves[2] = gamma10;
if (!(out_profile = cmsCreateRGBProfile(cmsD50_xyY(), &primaries,
out_curves)))
goto lcmserr;
if (!(transform = cmsCreateTransform(in_profile, TYPE_RGBA_16,
out_profile, TYPE_RGBA_16,
INTENT_RELATIVE_COLORIMETRIC, 0)))
goto lcmserr;
/* write header */
fprintf(stdout, "farbfeld");
val_be = htonl(width);
if (fwrite(&val_be, sizeof(uint32_t), 1, stdout) != 1)
goto writerr;
val_be = htonl(height);
if (fwrite(&val_be, sizeof(uint32_t), 1, stdout) != 1)
goto writerr;
while (cinfo.output_scanline < cinfo.output_height) {
/* jpeg_read_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could ask for
* more than one scanline at a time if that's more convenient. */
jpeg_read_scanlines(&cinfo, buffer, 1);
for (i = 0, dx = 0, sx = 0; i < width; i++, sx += 3, dx += 4) {
ff_row[dx] = buffer[0][sx] * 257;
ff_row[dx+1] = buffer[0][sx+1] * 257;
ff_row[dx+2] = buffer[0][sx+2] * 257;
ff_row[dx+3] = 65535;
}
cmsDoTransform(transform, ff_row, ff_row, ff_row_len / 4);
for (i = 0; i < ff_row_len; i++) {
/* re-add alpha */
if (i >= 3 && (i - 3) % 4 == 0)
ff_row[i] = 65535;
/* swap endianness to BE */
ff_row[i] = htons(ff_row[i]);
}
/* write data */
if (fwrite(ff_row, 2, ff_row_len, stdout) != ff_row_len)
goto writerr;
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return 0;
writerr:
fprintf(stderr, "%s: fwrite: ", argv0);
perror(NULL);
return 1;
lcmserr:
fprintf(stderr, "%s: lcms error\n", argv0);
return 1;
}
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