pandory500/SDL-mirror
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Experiment to try to account for source clipping

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This commit is contained in:
Sam Lantinga 2011-02-20 23:16:58 -08:00
parent 04bd7cfffc
commit e4acc9ef07
1 changed files with 39 additions and 17 deletions
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56
src/render/SDL_render.c
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@ -999,6 +999,7 @@ SDL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
{ {
SDL_Window *window; SDL_Window *window;
SDL_Rect real_srcrect; SDL_Rect real_srcrect;
SDL_Rect clip_dstrect;
SDL_Rect real_dstrect; SDL_Rect real_dstrect;
CHECK_RENDERER_MAGIC(renderer, -1); CHECK_RENDERER_MAGIC(renderer, -1);
@ -1010,6 +1011,16 @@ SDL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
} }
window = renderer->window; window = renderer->window;
if (dstrect) {
clip_dstrect = *dstrect;
} else {
clip_dstrect.x = 0;
clip_dstrect.y = 0;
clip_dstrect.w = renderer->viewport.w;
clip_dstrect.h = renderer->viewport.h;
}
dstrect = &clip_dstrect;
real_srcrect.x = 0; real_srcrect.x = 0;
real_srcrect.y = 0; real_srcrect.y = 0;
real_srcrect.w = texture->w; real_srcrect.w = texture->w;
@ -1018,29 +1029,40 @@ SDL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) { if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
return 0; return 0;
} }
/* Clip dstrect by the same amount as srcrect was clipped */
if (srcrect->w != real_srcrect.w) {
int deltax = (real_srcrect.x - srcrect->x);
int deltaw = (real_srcrect.w - srcrect->w);
clip_dstrect.x += (deltax * clip_dstrect.w) / srcrect->w;
clip_dstrect.w += (deltaw * clip_dstrect.w) / srcrect->w;
}
if (srcrect->h != real_srcrect.h) {
int deltay = (real_srcrect.y - srcrect->y);
int deltah = (real_srcrect.h - srcrect->h);
clip_dstrect.y += (deltay * clip_dstrect.h) / srcrect->h;
clip_dstrect.h += (deltah * clip_dstrect.h) / srcrect->h;
}
} }
real_dstrect.x = 0; real_dstrect.x = 0;
real_dstrect.y = 0; real_dstrect.y = 0;
real_dstrect.w = renderer->viewport.w; real_dstrect.w = renderer->viewport.w;
real_dstrect.h = renderer->viewport.h; real_dstrect.h = renderer->viewport.h;
if (dstrect) { if (!SDL_IntersectRect(&clip_dstrect, &real_dstrect, &real_dstrect)) {
if (!SDL_IntersectRect(dstrect, &real_dstrect, &real_dstrect)) { return 0;
return 0; }
} /* Clip srcrect by the same amount as dstrect was clipped */
/* Clip srcrect by the same amount as dstrect was clipped */ if (dstrect->w != real_dstrect.w) {
if (dstrect->w != real_dstrect.w) { int deltax = (real_dstrect.x - dstrect->x);
int deltax = (real_dstrect.x - dstrect->x); int deltaw = (real_dstrect.w - dstrect->w);
int deltaw = (real_dstrect.w - dstrect->w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w;
real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w;
real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; }
} if (dstrect->h != real_dstrect.h) {
if (dstrect->h != real_dstrect.h) { int deltay = (real_dstrect.y - dstrect->y);
int deltay = (real_dstrect.y - dstrect->y); int deltah = (real_dstrect.h - dstrect->h);
int deltah = (real_dstrect.h - dstrect->h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h;
real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
}
} }
if (texture->native) { if (texture->native) {