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stb_image: Fix rounding during unpremultiply.

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This is the same method as in pull request #455, but using integer
arithmetic instead of converting to float.

Fixes #455.
master
Fabian Giesen ago%!(EXTRA string=8 years)
parent 463dd85f1f
commit 25a2596b2f
1 changed files with 5 additions and 4 deletions
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  1. 9
      stb_image.h

9
stb_image.h
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@ -98,7 +98,7 @@ RECENT REVISION HISTORY:
Michaelangel007@github Philipp Wiesemann Dale Weiler github:grim210 Michaelangel007@github Philipp Wiesemann Dale Weiler github:grim210
Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:sammyhw Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:sammyhw
Blazej Dariusz Roszkowski Gregory Mullen github:phprus Blazej Dariusz Roszkowski Gregory Mullen github:phprus
Kevin Schmidt github:poppolopoppo Christian Floisand Kevin Schmidt github:poppolopoppo
*/ */
#ifndef STBI_INCLUDE_STB_IMAGE_H #ifndef STBI_INCLUDE_STB_IMAGE_H
@ -4670,9 +4670,10 @@ static void stbi__de_iphone(stbi__png *z)
stbi_uc a = p[3]; stbi_uc a = p[3];
stbi_uc t = p[0]; stbi_uc t = p[0];
if (a) { if (a) {
p[0] = p[2] * 255 / a; stbi_uc half = a / 2;
p[1] = p[1] * 255 / a; p[0] = (p[2] * 255 + half) / a;
p[2] = t * 255 / a; p[1] = (p[1] * 255 + half) / a;
p[2] = ( t * 255 + half) / a;
} else { } else {
p[0] = p[2]; p[0] = p[2];
p[2] = t; p[2] = t;

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