Performs a fast blit from the source surface to the destination surface.
Defined in SDL_surface.h
#define SDL_BlitSurface SDL_UpperBlitReturns 0 if the blit is successful, otherwise it returns -1.
This assumes that the source and destination rectangles are the same
size. If either srcrect or dstrect are NULL,
the entire surface (src or dst) is copied. The
final blit rectangle is saved in dstrect after all clipping
is performed.
The blit function should not be called on a locked surface.
The blit semantics for surfaces with and without blending and colorkey are defined as follows:
RGBA->RGB:
Source surface blend mode set to SDL_BLENDMODE_BLEND:
alpha-blend (using the source alpha-channel and per-surface alpha)
SDL_SRCCOLORKEY ignored.
Source surface blend mode set to SDL_BLENDMODE_NONE:
copy RGB.
if SDL_SRCCOLORKEY set, only copy the pixels matching the
RGB values of the source color key, ignoring alpha in the
comparison.
RGB->RGBA:
Source surface blend mode set to SDL_BLENDMODE_BLEND:
alpha-blend (using the source per-surface alpha)
Source surface blend mode set to SDL_BLENDMODE_NONE:
copy RGB, set destination alpha to source per-surface alpha value.
both:
if SDL_SRCCOLORKEY set, only copy the pixels matching the
source color key.
RGBA->RGBA:
Source surface blend mode set to SDL_BLENDMODE_BLEND:
alpha-blend (using the source alpha-channel and per-surface alpha)
SDL_SRCCOLORKEY ignored.
Source surface blend mode set to SDL_BLENDMODE_NONE:
copy all of RGBA to the destination.
if SDL_SRCCOLORKEY set, only copy the pixels matching the
RGB values of the source color key, ignoring alpha in the
comparison.
RGB->RGB:
Source surface blend mode set to SDL_BLENDMODE_BLEND:
alpha-blend (using the source per-surface alpha)
Source surface blend mode set to SDL_BLENDMODE_NONE:
copy RGB.
both:
if SDL_SRCCOLORKEY set, only copy the pixels matching the
source color key.You should call SDL_BlitSurface() unless you know exactly how SDL blitting works internally and how to use the other blit functions.