SDL_BlitSurface(3)

NAME
SDL_BlitSurface - Performs a fast blit from the source surface to the destination surface with clipping.

SYNOPSIS
#include <SDL3/SDL_surface.h>

bool SDL_BlitSurface(SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, const SDL_Rect *dstrect);

DESCRIPTION
If either srcrect or dstrect are NULL, the entire surface (src or dst) is copied while ensuring clipping to dst->clip_rect.

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 that do not match 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 that do not match 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 that do not match 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 that do not match the
              source color key.

FUNCTION PARAMETERS

src the SDL_Surface structure to be copied from.

srcrect
    the SDL_Rect structure representing the rectangle to be copied, or NULL to copy the entire surface.

dst the SDL_Surface structure that is the blit target.

dstrect
    the SDL_Rect structure representing the x and y position in the destination surface, or NULL for (0,0). The width and height are ignored, and are copied from srcrect. If you want a specific width and height, you should use SDL_BlitSurfaceScaled().

RETURN VALUE
for more information.

THREAD SAFETY
Only one thread should be using the src and dst surfaces at any given time.

AVAILABILITY
This function is available since SDL 3.2.0.

SEE ALSO
SDL_BlitSurfaceScaled(3)