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First pass on SDL render clip rect functionality

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This commit is contained in:
Sam Lantinga 2013-05-04 04:46:00 -07:00
parent 0a3ab9190b
commit 866f2e5f9e
10 changed files with 227 additions and 28 deletions
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34
src/render/SDL_render.c
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@ -932,6 +932,7 @@ SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
if (texture && !renderer->target) {
/* Make a backup of the viewport */
renderer->viewport_backup = renderer->viewport;
renderer->clip_rect_backup = renderer->clip_rect;
renderer->scale_backup = renderer->scale;
renderer->logical_w_backup = renderer->logical_w;
renderer->logical_h_backup = renderer->logical_h;
@ -953,6 +954,7 @@ SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
renderer->logical_h = 0;
} else {
renderer->viewport = renderer->viewport_backup;
renderer->clip_rect = renderer->clip_rect_backup;
renderer->scale = renderer->scale_backup;
renderer->logical_w = renderer->logical_w_backup;
renderer->logical_h = renderer->logical_h_backup;
@ -960,6 +962,9 @@ SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
if (renderer->UpdateViewport(renderer) < 0) {
return -1;
}
if (renderer->UpdateClipRect(renderer) < 0) {
return -1;
}
/* All set! */
return 0;
@ -1097,6 +1102,35 @@ SDL_RenderGetViewport(SDL_Renderer * renderer, SDL_Rect * rect)
}
}
int
SDL_RenderSetClipRect(SDL_Renderer * renderer, const SDL_Rect * rect)
{
CHECK_RENDERER_MAGIC(renderer, )
if (rect) {
renderer->clip_rect.x = (int)SDL_floor(rect->x * renderer->scale.x);
renderer->clip_rect.y = (int)SDL_floor(rect->y * renderer->scale.y);
renderer->clip_rect.w = (int)SDL_ceil(rect->w * renderer->scale.x);
renderer->clip_rect.h = (int)SDL_ceil(rect->h * renderer->scale.y);
} else {
SDL_zero(renderer->clip_rect);
}
return renderer->UpdateClipRect(renderer);
}
void
SDL_RenderGetClipRect(SDL_Renderer * renderer, SDL_Rect * rect)
{
CHECK_RENDERER_MAGIC(renderer, )
if (rect) {
rect->x = (int)(renderer->clip_rect.x / renderer->scale.x);
rect->y = (int)(renderer->clip_rect.y / renderer->scale.y);
rect->w = (int)(renderer->clip_rect.w / renderer->scale.x);
rect->h = (int)(renderer->clip_rect.h / renderer->scale.y);
}
}
int
SDL_RenderSetScale(SDL_Renderer * renderer, float scaleX, float scaleY)
{