From 1f2b441c9a78a8ec43d3b5a80aef28dc5a74aaa3 Mon Sep 17 00:00:00 2001
From: LaurentGom <LaurentGom@4e206d99-4929-0410-ac5d-dfc041789085>
Date: Sun, 27 Dec 2009 23:23:45 +0000
Subject: [PATCH] Fixed alpha calculation in Image::Copy with applyAlpha = true
git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1312 4e206d99-4929-0410-ac5d-dfc041789085
---
src/SFML/Graphics/Image.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/SFML/Graphics/Image.cpp b/src/SFML/Graphics/Image.cpp
index d706daae..29d5126b 100644
--- a/src/SFML/Graphics/Image.cpp
+++ b/src/SFML/Graphics/Image.cpp
@@ -299,11 +299,12 @@ void Image::Copy(const Image& source, unsigned int destX, unsigned int destY, co
const Uint8* src = srcPixels + j * 4;
Uint8* dst = dstPixels + j * 4;
- // Interpolate RGB components using the alpha value of the source pixel
+ // Interpolate RGBA components using the alpha value of the source pixel
Uint8 alpha = src[3];
dst[0] = (src[0] * alpha + dst[0] * (255 - alpha)) / 255;
dst[1] = (src[1] * alpha + dst[1] * (255 - alpha)) / 255;
dst[2] = (src[2] * alpha + dst[2] * (255 - alpha)) / 255;
+ dst[3] = alpha + dst[3] * (255 - alpha) / 255;
}
srcPixels += srcStride;