/// <summary>
/// Draws a resizable texture.
/// See the documentation for an explanation of how resizable textures work.
/// </summary>
/// <param name="texture">The resizable texture to draw.</param>
/// <param name="bounds">The bounds that the texture should be resized to.</param>
/// <param name="color">The color to multiply with the colors of the texture. If unspecified the colors of the texture will be unchanged.</param>
/// <param name="blendMode">The blend mode to use when drawing the texture. If unspecified the texture will be drawn using the standard alpha-based blend mode.</param>
/// <param name="scaleMode">The scale mode to use when drawing the texture. If unspecified the texture will be linearly interpolated.</param>
public static void DrawResizableTexture(ResizableTexture texture, Bounds2 bounds, Color?color = null, TextureBlendMode blendMode = TextureBlendMode.Normal, TextureScaleMode scaleMode = TextureScaleMode.Linear)
{
DrawTextureSetup(texture.Handle, color, blendMode, scaleMode);
/*
* 0 bxmin bxmax txmax
* v v v v
* +----|-------------|----+ < tymax
* | 1 | 5 | 2 |
* -----+-------------+----- < bymax
* | | | |
* | | | |
* | 6 | 9 | 7 |
* | | | |
* | | | |
* -----+-------------+----- < bymin
* | 3 | 8 | 4 |
* +----|-------------|----+ < 0
*/
int bxmin = texture.LeftOffset;
int bxmax = texture.RightOffset;
int bymin = texture.TopOffset;
int bymax = texture.BottomOffset;
int txmax = texture.Width;
int tymax = texture.Height;
int px = (int)bounds.Position.X;
int py = (int)bounds.Position.Y;
// Don't let the overall size be so small that segment 9 has a negative size in either dimension:
int sx = Math.Max((int)bounds.Size.X, txmax - bxmax + bxmin);
int sy = Math.Max((int)bounds.Size.Y, tymax - bymax + bymin);
// Draw each of the nine segments:
DrawResizableTextureSegment(texture, 0, 0, bxmin, bymin, px, py, bxmin, bymin);
DrawResizableTextureSegment(texture, bxmax, 0, txmax - bxmax, bymin, px + sx - (txmax - bxmax), py, txmax - bxmax, bymin);
DrawResizableTextureSegment(texture, 0, bymax, bxmin, tymax - bymax, px, py + sy - (tymax - bymax), bxmin, tymax - bymax);
DrawResizableTextureSegment(texture, bxmax, bymax, txmax - bxmax, tymax - bymax, px + sx - (txmax - bxmax), py + sy - (tymax - bymax), txmax - bxmax, tymax - bymax);
DrawResizableTextureSegment(texture, bxmin, 0, bxmax - bxmin, bymin, px + bxmin, py, sx - bxmin - (txmax - bxmax), bymin);
DrawResizableTextureSegment(texture, 0, bymin, bxmin, bymax - bymin, px, py + bymin, bxmin, sy - bymin - (tymax - bymax));
DrawResizableTextureSegment(texture, bxmax, bymin, txmax - bxmax, bymax - bymin, px + sx - (txmax - bxmax), py + bymin, txmax - bxmax, sy - bymin - (tymax - bymax));
DrawResizableTextureSegment(texture, bxmin, bymax, bxmax - bxmin, tymax - bymax, px + bxmin, py + sy - (tymax - bymax), sx - bxmin - (txmax - bxmax), tymax - bymax);
DrawResizableTextureSegment(texture, bxmin, bymin, bxmax - bxmin, bymax - bymin, px + bxmin, py + bymin, sx - bxmin - (txmax - bxmax), sy - bymin - (tymax - bymax));
}
private static void DrawResizableTextureSegment(ResizableTexture texture, int subtextureX, int subtextureY, int subtextureW, int subtextureH, int destX, int destY, int destW, int destH)
{
// Don't draw invisible segments:
if (subtextureW <= 0 || subtextureH <= 0)
{
return;
}
SDL.SDL_Rect src;
src.x = subtextureX;
src.y = subtextureY;
src.w = subtextureW;
src.h = subtextureH;
SDL.SDL_Rect dest;
dest.x = destX;
dest.y = destY;
dest.w = destW;
dest.h = destH;
SDL.SDL_RenderCopy(Renderer, texture.Handle, ref src, ref dest);
}