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Bitmap: Split surface pixel address calculation into helper

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This commit is contained in:
Jonas Kulla 2016-07-27 11:56:43 +02:00
parent 47ef36ca19
commit fdaf6c3611
1 changed files with 9 additions and 3 deletions
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12
src/bitmap.cpp
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@ -768,6 +768,14 @@ void Bitmap::clear()
p->onModified(); p->onModified();
} }
static uint32_t &getPixelAt(SDL_Surface *surf, SDL_PixelFormat *form, int x, int y)
{
size_t offset = x*form->BytesPerPixel + y*surf->pitch;
uint8_t *bytes = (uint8_t*) surf->pixels + offset;
return *((uint32_t*) bytes);
}
Color Bitmap::getPixel(int x, int y) const Color Bitmap::getPixel(int x, int y) const
{ {
guardDisposed(); guardDisposed();
@ -790,9 +798,7 @@ Color Bitmap::getPixel(int x, int y) const
glState.viewport.pop(); glState.viewport.pop();
} }
size_t offset = x*p->format->BytesPerPixel + y*p->surface->pitch; uint32_t pixel = getPixelAt(p->surface, p->format, x, y);
uint8_t *bytes = (uint8_t*) p->surface->pixels + offset;
uint32_t pixel = *((uint32_t*) bytes);
return Color((pixel >> p->format->Rshift) & 0xFF, return Color((pixel >> p->format->Rshift) & 0xFF,
(pixel >> p->format->Gshift) & 0xFF, (pixel >> p->format->Gshift) & 0xFF,