private IntPtr GetGlyphSurface(ushort index)
{
SDL.SDL_Color color = new SDL.SDL_Color();
color.r = color.g = color.b = color.a = 255;
IntPtr surfacePtr = SDL_ttf.TTF_RenderGlyph_Blended(handle, index, color);
if (surfacePtr == IntPtr.Zero)
{
return(IntPtr.Zero); //throw new Exception("Failed to render glyph: " + SDL.SDL_GetError());
}
SDL.SDL_Surface surface = Marshal.PtrToStructure <SDL.SDL_Surface>(surfacePtr);
SDL.SDL_PixelFormat surfaceFormat = Marshal.PtrToStructure <SDL.SDL_PixelFormat>(surface.format);
if (surfaceFormat.format == SDL.SDL_PIXELFORMAT_INDEX8)
{
IntPtr convertedSurface = SDL.SDL_ConvertSurfaceFormat(surfacePtr, SDL.SDL_PIXELFORMAT_ARGB8888, 0);
SDL.SDL_FreeSurface(surfacePtr);
surfacePtr = convertedSurface;
//surface = Marshal.PtrToStructure<SDL.SDL_Surface>(surfacePtr);
//surfaceFormat = Marshal.PtrToStructure<SDL.SDL_PixelFormat>(surface.format);
}
else if (surfaceFormat.format != SDL.SDL_PIXELFORMAT_ARGB8888)
{
throw new Exception("Failed to map SDL surface format to Bgfx texture format: " + SDL.SDL_GetPixelFormatName(surfaceFormat.format));
}
return(surfacePtr);
}
private byte[] GetGlyphData(IntPtr surfacePtr, FontGlyph glyph, out int width, out int height)
{
SDL.SDL_Surface surface = Marshal.PtrToStructure <SDL.SDL_Surface>(surfacePtr);
SDL.SDL_PixelFormat surfaceFormat = Marshal.PtrToStructure <SDL.SDL_PixelFormat>(surface.format);
IntPtr surfaceData = surface.pixels;
int surfacePitch = surface.pitch;
int ascent = GetAscent();
int descent = GetDescent();
byte[] data = new byte[glyph.width * glyph.height * surfaceFormat.BytesPerPixel];
unsafe
{
byte *src = (byte *)surfaceData;
int rowBytes = glyph.width * surfaceFormat.BytesPerPixel;
int offsetX = glyph.minX;
int offsetY = -glyph.minY + (ascent - glyph.height);
// bug in SDL_ttf?:
// some glyphs have parts rendered outside the surface area
if (offsetY < 0)
{
offsetY = 0;
}
if (offsetX < 0)
{
offsetX = 0;
}
src += offsetY * surfacePitch;
src += offsetX * surfaceFormat.BytesPerPixel;
for (int i = 0; i < glyph.height; i++)
{
Marshal.Copy((IntPtr)src, data, i * rowBytes, rowBytes);
src += surfacePitch;
}
}
width = glyph.width;
height = glyph.height;
return(data);
}
public void SetPixelFormatStr(SDL.SDL_PixelFormat ThePixelFormat)
{
Marshal.StructureToPtr(ThePixelFormat, myPtr, true);
}
public SDLTexture(SDLRenderer Renderer, ref SDL.SDL_PixelFormat Format, SDL.SDL_TextureAccess Access, int W, int H)
{
myPtr = SDL.SDL_CreateTexture(Renderer.Ptr, Format.format, (int)Access, W, H);
CheckPtr();
}