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Extend the 9-grid functions to handle a non-uniform grid layout (thanks @zaun!)

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Fixes https://github.com/libsdl-org/SDL/issues/10389
This commit is contained in:
Sam Lantinga
2024-07-31 22:09:42 -07:00
parent a1c6f99877
commit a5f18048b2
7 changed files with 358 additions and 151 deletions
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11
include/SDL3/SDL_surface.h
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@@ -1105,8 +1105,8 @@ extern SDL_DECLSPEC int SDLCALL SDL_BlitSurfaceTiledWithScale(SDL_Surface *src,
* Perform a scaled blit using the 9-grid algorithm to a destination surface,
* which may be of a different format.
*
* The pixels in the source surface are split into a 3x3 grid, using the
* corner size for each corner, and the sides and center making up the
* The pixels in the source surface are split into a 3x3 grid, using the different
* corner sizes for each corner, and the sides and center making up the
* remaining pixels. The corners are then scaled using `scale` and fit into
* the corners of the destination rectangle. The sides and center are then
* stretched into place to cover the remaining destination rectangle.
@@ -1114,7 +1114,10 @@ extern SDL_DECLSPEC int SDLCALL SDL_BlitSurfaceTiledWithScale(SDL_Surface *src,
* \param src the SDL_Surface structure to be copied from.
* \param srcrect the SDL_Rect structure representing the rectangle to be used
* for the 9-grid, or NULL to use the entire surface.
* \param corner_size the size, in pixels, of the corner in `srcrect`.
* \param left_width the width, in pixels, of the left corners in `srcrect`.
* \param right_width the width, in pixels, of the right corners in `srcrect`.
* \param top_height the height, in pixels, of the top corners in `srcrect`.
* \param bottom_height the height, in pixels, of the bottom corners in `srcrect`.
* \param scale the scale used to transform the corner of `srcrect` into the
* corner of `dstrect`, or 0.0f for an unscaled blit.
* \param scaleMode scale algorithm to be used.
@@ -1132,7 +1135,7 @@ extern SDL_DECLSPEC int SDLCALL SDL_BlitSurfaceTiledWithScale(SDL_Surface *src,
*
* \sa SDL_BlitSurface
*/
extern SDL_DECLSPEC int SDLCALL SDL_BlitSurface9Grid(SDL_Surface *src, const SDL_Rect *srcrect, int corner_size, float scale, SDL_ScaleMode scaleMode, SDL_Surface *dst, const SDL_Rect *dstrect);
extern SDL_DECLSPEC int SDLCALL SDL_BlitSurface9Grid(SDL_Surface *src, const SDL_Rect *srcrect, int left_width, int right_width, int top_height, int bottom_height, float scale, SDL_ScaleMode scaleMode, SDL_Surface *dst, const SDL_Rect *dstrect);
/**
* Map an RGB triple to an opaque pixel value for a surface.