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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 <lcms2.h>
#include <png.h>
#define HEADER "farbfeld########"
static char *argv0;
/* ProPhoto RGB */
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 */
};
void
pngerr(png_structp pngs, const char *msg)
{
fprintf(stderr, "%s: libpng: %s\n", argv0, msg);
exit(1);
}
int
main(int argc, char *argv[])
{
cmsContext icc_context;
cmsHPROFILE out_prof;
cmsMLU *mlu1, *mlu2;
cmsToneCurve *gamma18, *out_curve[3];
png_structp pngs;
png_infop pngi;
size_t png_row_len, j;
uint32_t icclen, width, height, i;
uint16_t tmp16, *png_row;
uint8_t hdr[16], *icc;
argv0 = argv[0], argc--, argv++;
if (argc) {
fprintf(stderr, "usage: %s\n", argv0);
return 1;
}
/* header */
if (fread(hdr, 1, strlen(HEADER), stdin) != strlen(HEADER)) {
fprintf(stderr, "%s: incomplete header\n", argv0);
return 1;
}
if (memcmp("farbfeld", hdr, strlen("farbfeld"))) {
fprintf(stderr, "%s: invalid magic value\n", argv0);
return 1;
}
width = ntohl(*((uint32_t *)(hdr + 8)));
height = ntohl(*((uint32_t *)(hdr + 12)));
/* icc profile (ProPhoto RGB) */
if (!(icc_context = cmsCreateContext(NULL, NULL)))
goto lcmserr;
if (!(gamma18 = cmsBuildGamma(icc_context, 1.8)))
goto lcmserr;
out_curve[0] = out_curve[1] = out_curve[2] = gamma18;
if (!(out_prof = cmsCreateRGBProfileTHR(icc_context, cmsD50_xyY(),
&primaries, out_curve)))
goto lcmserr;
cmsSetHeaderFlags(out_prof, cmsEmbeddedProfileTrue | cmsUseAnywhere);
cmsSetHeaderRenderingIntent(out_prof, INTENT_RELATIVE_COLORIMETRIC);
cmsSetDeviceClass(out_prof, cmsSigColorSpaceClass);
if (!(mlu1 = cmsMLUalloc(NULL, 1)) || !(mlu2 = cmsMLUalloc(NULL, 1)))
goto lcmserr;
cmsMLUsetASCII(mlu1, "en", "US", "Public Domain");
cmsWriteTag(out_prof, cmsSigCopyrightTag, mlu1);
cmsMLUsetASCII(mlu2, "en", "US", "ProPhoto RGB");
cmsWriteTag(out_prof, cmsSigProfileDescriptionTag, mlu2);
cmsWriteTag(out_prof, cmsSigDeviceModelDescTag, mlu2);
cmsSaveProfileToMem(out_prof, NULL, &icclen);
if (!(icc = malloc(icclen))) {
fprintf(stderr, "%s: malloc: out of memory\n", argv0);
return 1;
}
cmsSaveProfileToMem(out_prof, icc, &icclen);
/* load png */
pngs = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, pngerr,
NULL);
pngi = png_create_info_struct(pngs);
if (!pngs || !pngi) {
fprintf(stderr, "%s: failed to initialize libpng\n", argv0);
return 1;
}
png_init_io(pngs, stdout);
png_set_IHDR(pngs, pngi, width, height, 16, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
png_set_iCCP(pngs, pngi, "ProPhoto RGB", 0, icc, icclen);
png_write_info(pngs, pngi);
/* write rows */
png_row_len = strlen("RGBA") * width * sizeof(uint16_t);
if (!(png_row = malloc(png_row_len))) {
fprintf(stderr, "%s: malloc: out of memory\n", argv0);
return 1;
}
for (i = 0; i < height; ++i) {
for (j = 0; j < png_row_len / sizeof(uint16_t); ++j) {
if (fread(&tmp16, sizeof(uint16_t), 1, stdin) != 1) {
fprintf(stderr, "%s: unexpected EOF\n", argv0);
return 1;
}
png_row[j] = tmp16;
}
png_write_row(pngs, (uint8_t *)png_row);
}
png_write_end(pngs, NULL);
png_destroy_write_struct(&pngs, NULL);
return 0;
lcmserr:
fprintf(stderr, "%s: lcms error\n", argv0);
return 1;
}
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