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tweak RGB-to-Y conversion

pull/415/merge
Sean Barrett 2017-03-03 08:30:49 -08:00
parent 64e1799f24
commit 786ac92daa
1 changed files with 11 additions and 6 deletions
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17
stb_image.h
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@ -48,7 +48,7 @@ LICENSE
RECENT REVISION HISTORY:
2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD
2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes
2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
@ -78,6 +78,7 @@ RECENT REVISION HISTORY:
github:urraka (animated gif) Junggon Kim (PNM comments)
Daniel Gibson (16-bit TGA)
socks-the-fox (16-bit TGA)
Jeremy Sawicki (handle all ImageNet JPGs)
Optimizations & bugfixes
Fabian "ryg" Giesen
Arseny Kapoulkine
@ -95,7 +96,7 @@ RECENT REVISION HISTORY:
Ryamond Barbiero Paul Du Bois Engin Manap github:snagar
Michaelangel007@github Oriol Ferrer Mesia Dale Weiler github:Zelex
Philipp Wiesemann Josh Tobin github:rlyeh github:grim210@github
Blazej Dariusz Roszkowski github:sammyhw Jeremy Sawicki
Blazej Dariusz Roszkowski github:sammyhw
*/
@ -3565,10 +3566,14 @@ static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp
}
} else {
if (z->rgb == 3) {
for (i=0; i < z->s->img_x; ++i) {
out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
out[1] = 255;
out += n;
if (n == 1)
for (i=0; i < z->s->img_x; ++i)
*out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
else {
for (i=0; i < z->s->img_x; ++i, out += 2) {
out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
out[1] = 255;
}
}
} else {
stbi_uc *y = coutput[0];