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Fixed bug 3159 - SDL_blit_slow with BLENDING does not work
Fritzor Source Suface is ABGR and Destination Surface is ABGR. We use software blending. In the Switch-Case statement for SDL_COPY_BLEND (Line 126) the alpha-channel is not calculated like in every SDL_blit_auto - function. So if the destination Surface has alpha - channel of zero the resulting surface has zero as well. Add: ?dstA = srcA + ((255 - srcA) * dstA) / 255;? to code and everything is okay.
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@ -129,6 +129,7 @@ SDL_Blit_Slow(SDL_BlitInfo * info)
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dstR = srcR + ((255 - srcA) * dstR) / 255;
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dstG = srcG + ((255 - srcA) * dstG) / 255;
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dstB = srcB + ((255 - srcA) * dstB) / 255;
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dstA = srcA + ((255 - srcA) * dstA) / 255;
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break;
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case SDL_COPY_ADD:
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dstR = srcR + dstR;
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