pandory500/SDL-mirror
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Do the src and dst rectangle clipping without affecting the surface clip rectangle.

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This commit is contained in:
Sam Lantinga 2012-10-01 00:56:58 -07:00
parent 635ef29e91
commit 0b35b7b0bf
1 changed files with 17 additions and 4 deletions
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21
src/video/SDL_surface.c
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@ -693,26 +693,39 @@ SDL_LowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
/* Save off the original dst width, height */ /* Save off the original dst width, height */
int dstW = dstrect->w; int dstW = dstrect->w;
int dstH = dstrect->h; int dstH = dstrect->h;
SDL_Rect full_rect;
SDL_Rect final_dst = *dstrect; SDL_Rect final_dst = *dstrect;
SDL_Rect final_src = *srcrect; SDL_Rect final_src = *srcrect;
/* Clip the dst surface to the dstrect */ /* Clip the dst surface to the dstrect */
SDL_SetClipRect( dst, &final_dst ); full_rect.x = 0;
full_rect.y = 0;
full_rect.w = dst->w;
full_rect.h = dst->h;
if (!SDL_IntersectRect(&final_dst, &full_rect, &final_dst)) {
return 0;
}
/* Did the dst width change? */ /* Did the dst width change? */
if ( dstW != dst->clip_rect.w ) { if ( dstW != final_dst.w ) {
/* scale the src width appropriately */ /* scale the src width appropriately */
final_src.w = final_src.w * dst->clip_rect.w / dstW; final_src.w = final_src.w * dst->clip_rect.w / dstW;
} }
/* Did the dst height change? */ /* Did the dst height change? */
if ( dstH != dst->clip_rect.h ) { if ( dstH != final_dst.h ) {
/* scale the src width appropriately */ /* scale the src width appropriately */
final_src.h = final_src.h * dst->clip_rect.h / dstH; final_src.h = final_src.h * dst->clip_rect.h / dstH;
} }
/* Clip the src surface to the srcrect */ /* Clip the src surface to the srcrect */
SDL_SetClipRect( src, &final_src ); full_rect.x = 0;
full_rect.y = 0;
full_rect.w = src->w;
full_rect.h = src->h;
if (!SDL_IntersectRect(&final_src, &full_rect, &final_src)) {
return 0;
}
src->map->info.flags |= SDL_COPY_NEAREST; src->map->info.flags |= SDL_COPY_NEAREST;