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Added SDL_BlitSurface9Grid() and SDL_RenderTexture9Grid()

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This commit is contained in:
Sam Lantinga
2024-07-20 16:39:09 -07:00
parent 9294476788
commit 6209c71f54
9 changed files with 583 additions and 0 deletions
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121
src/video/SDL_surface.c
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@@ -1444,6 +1444,127 @@ int SDL_BlitSurfaceTiledWithScale(SDL_Surface *src, const SDL_Rect *srcrect, flo
return 0;
}
int SDL_BlitSurface9Grid(SDL_Surface *src, const SDL_Rect *srcrect, int corner_size, float scale, SDL_ScaleMode scaleMode, SDL_Surface *dst, const SDL_Rect *dstrect)
{
SDL_Rect full_src, full_dst;
SDL_Rect curr_src, curr_dst;
int dst_corner_size;
/* Make sure the surfaces aren't locked */
if (!SDL_SurfaceValid(src)) {
return SDL_InvalidParamError("src");
} else if (!SDL_SurfaceValid(dst)) {
return SDL_InvalidParamError("dst");
}
if (!srcrect) {
full_src.x = 0;
full_src.y = 0;
full_src.w = src->w;
full_src.h = src->h;
srcrect = &full_src;
}
if (!dstrect) {
full_dst.x = 0;
full_dst.y = 0;
full_dst.w = dst->w;
full_dst.h = dst->h;
dstrect = &full_dst;
}
if (scale <= 0.0f || scale == 1.0f) {
dst_corner_size = corner_size;
} else {
dst_corner_size = (int)SDL_roundf(corner_size * scale);
}
// Upper-left corner
curr_src.x = srcrect->x;
curr_src.y = srcrect->y;
curr_src.w = corner_size;
curr_src.h = corner_size;
curr_dst.x = dstrect->x;
curr_dst.y = dstrect->y;
curr_dst.w = dst_corner_size;
curr_dst.h = dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Upper-right corner
curr_src.x = srcrect->x + srcrect->w - corner_size;
curr_dst.x = dstrect->x + dstrect->w - dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Lower-right corner
curr_src.y = srcrect->y + srcrect->h - corner_size;
curr_dst.y = dstrect->y + dstrect->h - dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Lower-left corner
curr_src.x = srcrect->x;
curr_dst.x = dstrect->x;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Left
curr_src.y = srcrect->y + corner_size;
curr_src.h = srcrect->h - 2 * corner_size;
curr_dst.y = dstrect->y + dst_corner_size;
curr_dst.h = dstrect->h - 2 * dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Right
curr_src.x = srcrect->x + srcrect->w - corner_size;
curr_dst.x = dstrect->x + dstrect->w - dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Top
curr_src.x = srcrect->x + corner_size;
curr_src.y = srcrect->y;
curr_src.w = srcrect->w - 2 * corner_size;
curr_src.h = corner_size;
curr_dst.x = dstrect->x + dst_corner_size;
curr_dst.y = dstrect->y;
curr_dst.w = dstrect->w - 2 * dst_corner_size;
curr_dst.h = dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Bottom
curr_src.y = srcrect->y + srcrect->h - corner_size;
curr_dst.y = dstrect->y + dstrect->h - dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
// Center
curr_src.x = srcrect->x + corner_size;
curr_src.y = srcrect->y + corner_size;
curr_src.w = srcrect->w - 2 * corner_size;
curr_src.h = srcrect->h - 2 * corner_size;
curr_dst.x = dstrect->x + dst_corner_size;
curr_dst.y = dstrect->y + dst_corner_size;
curr_dst.w = dstrect->w - 2 * dst_corner_size;
curr_dst.h = dstrect->h - 2 * dst_corner_size;
if (SDL_BlitSurfaceScaled(src, &curr_src, dst, &curr_dst, scaleMode) < 0) {
return -1;
}
return 0;
}
/*
* Lock a surface to directly access the pixels
*/