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Little faster CSDL_Ext::blit8bppAlphaTo24bpp, please review my code.

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This commit is contained in:
phoebus118 2008-03-03 10:52:32 +00:00
parent 88acb2e0c1
commit 5f4b582eab
1 changed files with 42 additions and 10 deletions
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52
SDL_Extensions.cpp
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@ -577,29 +577,61 @@ int CSDL_Ext::blit8bppAlphaTo24bpp(SDL_Surface * src, SDL_Rect * srcRect, SDL_Su
if(dst->format->Rshift==0) //like in most surfaces
{
for(int x=0; x<sr.w; ++x)
for(int y=0; y<sr.h; ++y)
{
for(int y=0; y<sr.h; ++y)
for(int x=0; x<sr.w; ++x)
{
SDL_Color tbc = src->format->palette->colors[*((Uint8*)src->pixels + (y+sr.y)*src->pitch + x + sr.x)]; //color to blit
Uint8 * p = (Uint8*)dst->pixels + (y+dstRect->y)*dst->pitch + (x+dstRect->x)*dst->format->BytesPerPixel; //place to blit at
p[0] = ((Uint32)tbc.unused*(Uint32)p[0] + (Uint32)tbc.r*(Uint32)(255-tbc.unused))>>8; //red
p[1] = ((Uint32)tbc.unused*(Uint32)p[1] + (Uint32)tbc.g*(Uint32)(255-tbc.unused))>>8; //green
p[2] = ((Uint32)tbc.unused*(Uint32)p[2] + (Uint32)tbc.b*(Uint32)(255-tbc.unused))>>8; //blue
switch ((Uint32)tbc.unused) {
case 0:
p[0] = (Uint32)tbc.r;
p[1] = (Uint32)tbc.g;
p[2] = (Uint32)tbc.b;
break;
case 128: // optimized
p[0] = ((Uint32)tbc.r + (Uint32)p[0]) >> 1;
p[1] = ((Uint32)tbc.g + (Uint32)p[1]) >> 1;
p[2] = ((Uint32)tbc.b + (Uint32)p[2]) >> 1;
break;
case 255:
break;
default:
p[0] = ((((Uint32)tbc.r-(Uint32)p[0])*(Uint32)tbc.unused) + p[0]) & 0xFF;
p[1] = ((((Uint32)tbc.g-(Uint32)p[1])*(Uint32)tbc.unused) + p[1]) & 0xFF;
p[2] = ((((Uint32)tbc.b-(Uint32)p[2])*(Uint32)tbc.unused) + p[2]) & 0xFF;
break;
}
}
}
}
else if(dst->format->Rshift==16) //such as screen
{
for(int x=0; x<sr.w; ++x)
for(int y=0; y<sr.h; ++y)
{
for(int y=0; y<sr.h; ++y)
for(int x=0; x<sr.w; ++x)
{
SDL_Color tbc = src->format->palette->colors[*((Uint8*)src->pixels + (y+sr.y)*src->pitch + x + sr.x)]; //color to blit
Uint8 * p = (Uint8*)dst->pixels + (y+dstRect->y)*dst->pitch + (x+dstRect->x)*dst->format->BytesPerPixel; //place to blit at
p[2] = ((Uint32)tbc.unused*(Uint32)p[2] + (Uint32)tbc.r*(Uint32)(255-tbc.unused))>>8; //red
p[1] = ((Uint32)tbc.unused*(Uint32)p[1] + (Uint32)tbc.g*(Uint32)(255-tbc.unused))>>8; //green
p[0] = ((Uint32)tbc.unused*(Uint32)p[0] + (Uint32)tbc.b*(Uint32)(255-tbc.unused))>>8; //blue
switch ((Uint32)tbc.unused) {
case 0:
p[2] = (Uint32)tbc.r;
p[1] = (Uint32)tbc.g;
p[0] = (Uint32)tbc.b;
break;
case 128: // optimized
p[2] = ((Uint32)tbc.r + (Uint32)p[2]) >> 1;
p[1] = ((Uint32)tbc.g + (Uint32)p[1]) >> 1;
p[0] = ((Uint32)tbc.b + (Uint32)p[0]) >> 1;
break;
case 255:
break;
default:
p[2] = ((((Uint32)tbc.r-(Uint32)p[2])*(Uint32)tbc.unused) + p[2]) & 0xFF;
p[1] = ((((Uint32)tbc.g-(Uint32)p[1])*(Uint32)tbc.unused) + p[1]) & 0xFF;
p[0] = ((((Uint32)tbc.b-(Uint32)p[0])*(Uint32)tbc.unused) + p[0]) & 0xFF;
break;
}
}
}
}