Function DrawGame

Source/scrollrt.cpp:799–941

* @brief Configure render and process screen rows * @param x Center of view in dPiece coordinate * @param y Center of view in dPiece coordinate */

 * @param y Center of view in dPiece coordinate
 */
static void DrawGame(int x, int y)
{
	int i, sx, sy, chunks, blocks;
	int wdt, nSrcOff, nDstOff;

	sx = (SCREEN_WIDTH % 64) / 2;
	sy = (VIEWPORT_HEIGHT % 32) / 2;

	if (zoomflag) {
		chunks = ceil(SCREEN_WIDTH / 64);
		blocks = ceil(VIEWPORT_HEIGHT / 32);

		gpBufStart = &gpBuffer[BUFFER_WIDTH * SCREEN_Y];
		gpBufEnd = &gpBuffer[BUFFER_WIDTH * (VIEWPORT_HEIGHT + SCREEN_Y)];
	} else {
		sy -= 32;

		chunks = ceil(SCREEN_WIDTH / 2 / 64) + 1; // TODO why +1?
		blocks = ceil(VIEWPORT_HEIGHT / 2 / 32);

		gpBufStart = &gpBuffer[(-17 + SCREEN_Y) * BUFFER_WIDTH];
		gpBufEnd = &gpBuffer[(160 + SCREEN_Y) * BUFFER_WIDTH];
	}

	sx += ScrollInfo._sxoff + SCREEN_X;
	sy += ScrollInfo._syoff + SCREEN_Y + 15;

	// Center screen
	x -= chunks;
	y--;

	// Keep evaulating untill MicroTiles can't affect screen
	blocks += ceil(MicroTileLen / 2);

	if (PANELS_COVER) {
		if (zoomflag) {
			if (chrflag || questlog) {
				x += 2;
				y -= 2;
				sx += 288;
				chunks -= 4;
			}
			if (invflag || sbookflag) {
				x += 2;
				y -= 2;
				sx -= 32;
				chunks -= 4;
			}
		}
	}

	switch (ScrollInfo._sdir) {
	case SDIR_N:
		sy -= 32;
		x--;
		y--;
		blocks++;
		break;