Function GFX_Screen_Copy2

src/gfx.c:326–391

* Copy information from one screenbuffer to the other. * @param xSrc The X-coordinate on the source. * @param ySrc The Y-coordinate on the source. * @param xDst The X-coordinate on the destination. * @param yDst The Y-coordinate on the destination. * @param width The width. * @param height The height. * @param screenSrc The ID of the source screen. * @param screenDst The ID of the destinat

 * @param skipNull Wether to skip pixel colour 0.
 */
void GFX_Screen_Copy2(int16 xSrc, int16 ySrc, int16 xDst, int16 yDst, int16 width, int16 height, Screen screenSrc, Screen screenDst, bool skipNull)
{
	uint8 *src;
	uint8 *dst;

	if (xSrc >= SCREEN_WIDTH) return;
	if (xSrc < 0) {
		xDst += xSrc;
		width += xSrc;
		xSrc = 0;
	}

	if (ySrc >= SCREEN_HEIGHT) return;
	if (ySrc < 0) {
		yDst += ySrc;
		height += ySrc;
		ySrc = 0;
	}

	if (xDst >= SCREEN_WIDTH) return;
	if (xDst < 0) {
		xSrc += xDst;
		width += xDst;
		xDst = 0;
	}

	if (yDst >= SCREEN_HEIGHT) return;
	if (yDst < 0) {
		ySrc += yDst;
		height += yDst;
		yDst = 0;
	}

	if (SCREEN_WIDTH - xSrc - width < 0) width = SCREEN_WIDTH - xSrc;
	if (SCREEN_HEIGHT - ySrc - height < 0) height = SCREEN_HEIGHT - ySrc;
	if (SCREEN_WIDTH - xDst - width < 0) width = SCREEN_WIDTH - xDst;
	if (SCREEN_HEIGHT - yDst - height < 0) height = SCREEN_HEIGHT - yDst;

	if (xSrc < 0 || xSrc >= SCREEN_WIDTH) return;
	if (xDst < 0 || xDst >= SCREEN_WIDTH) return;
	if (ySrc < 0 || ySrc >= SCREEN_HEIGHT) return;
	if (yDst < 0 || yDst >= SCREEN_HEIGHT) return;
	if (width < 0 || width >= SCREEN_WIDTH) return;
	if (height < 0 || height >= SCREEN_HEIGHT) return;

	GFX_Screen_SetDirty(screenDst, xDst, yDst, xDst + width, yDst + height);

	src = GFX_Screen_Get_ByIndex(screenSrc);
	dst = GFX_Screen_Get_ByIndex(screenDst);

	src += xSrc + ySrc * SCREEN_WIDTH;
	dst += xDst + yDst * SCREEN_WIDTH;

	while (height-- != 0) {
		if (skipNull) {
			uint16 i;
			for (i = 0; i < width; i++) {
				if (src[i] != 0) dst[i] = src[i];