public static unsafe IGraphics FlippedCopy(this IGraphics surface, RendererFlip flipMode)
{
var w = surface.Width;
var h = surface.Height;
var p = (int *)surface.Pixels;
var i = 0;
IGraphics result = null;
if (flipMode == RendererFlip.Horizontal)
{
result = surface.ToPen(w, h) as IGraphics;
var rp = (int *)result.Pixels;
for (var y = h - 1; y >= 0; y--)
{
for (var x = 0; x < w; x++)
{
var srcInd = y * w + x;
rp[i] = p[srcInd];
i++;
}
}
}
else if (flipMode == RendererFlip.Vertical)
{
result = surface.ToPen(w, h) as IGraphics;
var rp = (int *)result.Pixels;
for (var y = 0; y < h; y++)
{
for (var x = w - 1; x >= 0; x--)
{
var srcInd = y * w + x;
rp[i] = p[srcInd];
i++;
}
}
}
return(result);
}
public static extern int RenderCopyEx(Renderer renderer, Texture texture, Rect *srcrect, Rect *dstrect, double angle, Point *center, RendererFlip flip);
/// <summary>
/// Use this function to copy a portion of the texture to the current rendering target, optionally
/// rotating it by angle around the given center and also flipping it top-bottom and/or left-right.
/// </summary>
/// <param name="texture">The source texture.</param>
/// <param name="srcRect">The source Rect structure or Rect.Zero for the entire texture.</param>
/// <param name="dstRect">The destination Rect structure or Rect.Zero for the entire rendering target.</param>
/// <param name="angle">An angle in degrees that indicates the rotation that will be applied to dstrect, rotating it in a clockwise direction.</param>
/// <param name="centerPoint">A point indicating the point around which dstrect will be rotated (if Point.Zero, rotation will be done around dstrect.w/2, dstrect.h/2)</param>
/// <param name="rendererFlip">A SDL_RendererFlip value stating which flipping actions should be performed on the texture.</param>
public void CopyEx(Texture texture, Rect srcRect, Rect dstRect, double angle, Point?centerPoint = null, RendererFlip rendererFlip = RendererFlip.FlipNone)
{
// TODO: Also handle Rect.Null being passed into here
var src = new SDL.SDL_Rect()
{
x = srcRect.X, y = srcRect.Y, w = srcRect.W, h = srcRect.H
};
var dst = new SDL.SDL_Rect()
{
x = dstRect.X, y = dstRect.Y, w = dstRect.W, h = dstRect.H
};
SDL.SDL_RenderCopyEx(_sdlRenderer, texture.SdlTexture, ref src, ref dst, angle, IntPtr.Zero, (SDL.SDL_RendererFlip)rendererFlip);
}
