characterRgba function

int characterRgba(Pointer<SdlRenderer> renderer, int x, int y, int c, int r, int g, int b, int a,)

Implementation

int characterRgba(Pointer<SdlRenderer> renderer, int x, int y, int c, int r,
    int g, int b, int a) {
  Pointer<SdlRect> srect = calloc<SdlRect>();
  Pointer<SdlRect> drect = calloc<SdlRect>();
  int result;
  int ix, iy;
  int patt;
  Pointer<Uint32> pixels;
  int linepos;
  Pointer<SdlSurface> character;
  Pointer<SdlSurface> rotatedCharacter;
  int ci;
  /* Character index in cache */
  ci = c;
  /*
	* Create new charWidth x charHeight bitmap surface if not already present.
	* Might get rotated later.
	*/
  if (gfxPrimitivesFont[ci] == nullptr) {
    /*
		* Redraw character into surface
		*/
    character = sdlCreateRgbSurface(SDL_SWSURFACE, charWidth, charHeight, 32,
        0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF);
    if (character == nullptr) {
      return -1;
    }
    var charpos = ci * charSize;
    pixels = character.ref.pixels.cast<Uint32>();
    /*
		* Drawing loop
		*/
    patt = 0;
    linepos = 0;
    for (iy = 0; iy < charHeight; iy++) {
      patt = currentFontdata[charpos + iy];
      for (ix = 0; ix < charWidth; ix++) {
        var pixel = pixels + linepos;
        if (patt & 0x80 != 0) {
          pixel.value = 0xffffffff;
        } else {
          pixel.value = 0;
        }
        linepos++;
        patt = patt << 1;
      }
    }
    /* Maybe rotate and replace cached image */
    if (charRotation > 0) {
      rotatedCharacter = rotateSurface90Degrees(character, charRotation);
      sdlFreeSurface(character);
      character = rotatedCharacter;
    }
    /* Convert temp surface into texture */
    gfxPrimitivesFont[ci] = sdlCreateTextureFromSurface(renderer, character);
    sdlFreeSurface(character);
    /*
		* Check pointer
		*/
    if (gfxPrimitivesFont[ci] == nullptr) {
      return -1;
    }
  }
  /*
	* Set color
	*/
  result = 0;
  result |= sdlSetTextureColorMod(gfxPrimitivesFont[ci], r, g, b);
  result |= sdlSetTextureAlphaMod(gfxPrimitivesFont[ci], a);
  /*
	* Setup source rectangle
	*/
  srect.ref.x = 0;
  srect.ref.y = 0;
  srect.ref.w = charWidthLocal;
  srect.ref.h = charHeightLocal;
  /*
	* Setup destination rectangle
	*/
  drect.ref.x = x;
  drect.ref.y = y;
  drect.ref.w = charWidthLocal;
  drect.ref.h = charHeightLocal;
  /*
	* Draw texture onto destination
	*/
  result |= sdlRenderCopy(renderer, gfxPrimitivesFont[ci], srect, drect);
  calloc.free(srect);
  calloc.free(drect);
  return result;
}