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(rjpeg) Try manual conversion to RGB

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This commit is contained in:
twinaphex 2016-05-07 06:55:52 +02:00
parent c5895b4aa0
commit 0a2544c1bf
1 changed files with 25 additions and 4 deletions
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29
libretro-common/formats/jpeg/rjpeg.c
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@ -857,12 +857,33 @@ bool rjpeg_image_load(uint8_t *buf, void *data, size_t size)
out_img->pixels = (uint32_t*)malloc(rjpg->width * rjpg->height * rjpg->ncomp);
if (!out_img->pixels)
{
fprintf(stderr, "Failed to allocate JPEG pixels.\n");
goto error;
}
memcpy(out_img->pixels, rjpg->rgb, rjpg->width * rjpg->height * rjpg->ncomp);
if (rjpg->ncomp == 3)
{
/* convert to RGB */
int x, yy;
uint32_t *prgb = (uint32_t*)out_img->pixels;
const unsigned char *py = rjpg->comp[0].pixels;
const unsigned char *pcb = rjpg->comp[1].pixels;
const unsigned char *pcr = rjpg->comp[2].pixels;
for (yy = rjpg->height; yy; --yy)
{
for (x = 0; x < rjpg->width; ++x)
{
register int y = py[x] << 8;
register int cb = pcb[x] - 128;
register int cr = pcr[x] - 128;
*prgb++ = rjpeg_clip((y + 359 * cr + 128) >> 8);
*prgb++ = rjpeg_clip((y - 88 * cb - 183 * cr + 128) >> 8);
*prgb++ = rjpeg_clip((y + 454 * cb + 128) >> 8);
}
py += rjpg->comp[0].stride;
pcb += rjpg->comp[1].stride;
pcr += rjpg->comp[2].stride;
}
}
rjpeg_free(rjpg);