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Added a helper function SDL_LockTextureToSurface()

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Similar to SDL_LockTexture(), except the locked area is exposed as a SDL surface.
This commit is contained in:
Sylvain Becker 2019-09-30 20:58:44 +02:00
parent f46ac1e9f7
commit 1ae61f1009
6 changed files with 77 additions and 0 deletions
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46
src/render/SDL_render.c
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@ -1680,6 +1680,45 @@ SDL_LockTexture(SDL_Texture * texture, const SDL_Rect * rect,
}
}
int
SDL_LockTextureToSurface(SDL_Texture *texture, const SDL_Rect *rect,
SDL_Surface **surface)
{
SDL_Rect r;
void *pixels = NULL;
int pitch, ret;
if (texture == NULL || surface == NULL) {
return -1;
}
if (rect == NULL) {
r.x = 0;
r.y = 0;
r.w = texture->w;
r.h = texture->h;
} else {
r.x = rect->x;
r.y = rect->y;
r.w = SDL_min(texture->w - rect->x, rect->w);
r.h = SDL_min(texture->h - rect->y, rect->h);
}
ret = SDL_LockTexture(texture, &r, &pixels, &pitch);
if (ret < 0) {
return ret;
}
texture->locked_surface = SDL_CreateRGBSurfaceWithFormatFrom(pixels, r.w, r.h, 0, pitch, texture->format);
if (texture->locked_surface == NULL) {
SDL_UnlockTexture(texture);
return -1;
}
*surface = texture->locked_surface;
return 0;
}
static void
SDL_UnlockTextureYUV(SDL_Texture * texture)
{
@ -1738,6 +1777,9 @@ SDL_UnlockTexture(SDL_Texture * texture)
SDL_Renderer *renderer = texture->renderer;
renderer->UnlockTexture(renderer, texture);
}
SDL_FreeSurface(texture->locked_surface);
texture->locked_surface = NULL;
}
SDL_bool
@ -3090,6 +3132,10 @@ SDL_DestroyTexture(SDL_Texture * texture)
SDL_free(texture->pixels);
renderer->DestroyTexture(renderer, texture);
SDL_FreeSurface(texture->locked_surface);
texture->locked_surface = NULL;
SDL_free(texture);
}