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authorAndrei Karas <akaras@inbox.ru>2015-05-17 19:48:30 +0300
committerAndrei Karas <akaras@inbox.ru>2015-05-17 19:53:48 +0300
commitfbbf87a36f5f27851a2e2d17b95a0f17dd82624b (patch)
tree12a1e11578822f58ead1808dfe8b5fd69b96802e /src/resources/openglimagehelper.cpp
parentd9838926bee52d1ada15a59dce89d76813533480 (diff)
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Fix possible issues in texture atlas creation with non power of two image sizes.
Diffstat (limited to 'src/resources/openglimagehelper.cpp')
-rw-r--r--src/resources/openglimagehelper.cpp55
1 files changed, 52 insertions, 3 deletions
diff --git a/src/resources/openglimagehelper.cpp b/src/resources/openglimagehelper.cpp
index 4c7095ec8..ca553a180 100644
--- a/src/resources/openglimagehelper.cpp
+++ b/src/resources/openglimagehelper.cpp
@@ -134,8 +134,8 @@ int OpenGLImageHelper::powerOfTwo(const int input)
return value >= mTextureSize ? mTextureSize : value;
}
-SDL_Surface *OpenGLImageHelper::convertSurface(SDL_Surface *tmpImage,
- int width, int height)
+SDL_Surface *OpenGLImageHelper::convertSurfaceNormalize(SDL_Surface *tmpImage,
+ int width, int height)
{
if (!tmpImage)
return nullptr;
@@ -193,6 +193,55 @@ SDL_Surface *OpenGLImageHelper::convertSurface(SDL_Surface *tmpImage,
return tmpImage;
}
+SDL_Surface *OpenGLImageHelper::convertSurface(SDL_Surface *tmpImage,
+ int width, int height)
+{
+ if (!tmpImage)
+ return nullptr;
+
+#ifdef USE_SDL2
+ SDL_SetSurfaceAlphaMod(tmpImage, SDL_ALPHA_OPAQUE);
+#else
+ // Make sure the alpha channel is not used, but copied to destination
+ SDL_SetAlpha(tmpImage, 0, SDL_ALPHA_OPAQUE);
+#endif
+
+ // Determine 32-bit masks based on byte order
+ uint32_t rmask, gmask, bmask, amask;
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+ rmask = 0xff000000;
+ gmask = 0x00ff0000;
+ bmask = 0x0000ff00;
+ amask = 0x000000ff;
+#else
+ rmask = 0x000000ff;
+ gmask = 0x0000ff00;
+ bmask = 0x00ff0000;
+ amask = 0xff000000;
+#endif
+
+ if (tmpImage->format->BitsPerPixel != 32
+ || rmask != tmpImage->format->Rmask
+ || gmask != tmpImage->format->Gmask
+ || amask != tmpImage->format->Amask)
+ {
+ SDL_Surface *oldImage = tmpImage;
+#ifdef USE_SDL2
+ SDL_SetSurfaceBlendMode(oldImage, SDL_BLENDMODE_NONE);
+#endif
+ tmpImage = MSDL_CreateRGBSurface(SDL_SWSURFACE, width, height,
+ 32, rmask, gmask, bmask, amask);
+
+ if (!tmpImage)
+ {
+ logger->log("Error, image convert failed: out of memory");
+ return nullptr;
+ }
+ SDL_BlitSurface(oldImage, nullptr, tmpImage, nullptr);
+ }
+ return tmpImage;
+}
+
void OpenGLImageHelper::bindTexture(const GLuint texture)
{
switch (mUseOpenGL)
@@ -241,7 +290,7 @@ Image *OpenGLImageHelper::glLoad(SDL_Surface *tmpImage,
height = tmpImage->h;
SDL_Surface *oldImage = tmpImage;
- tmpImage = convertSurface(tmpImage, width, height);
+ tmpImage = convertSurfaceNormalize(tmpImage, width, height);
const int realWidth = tmpImage->w;
const int realHeight = tmpImage->h;