Function scrollrt_draw_cursor_item

Source/scrollrt.cpp:131–207

* @brief Draw the cursor on the back buffer */

 * @brief Draw the cursor on the back buffer
 */
static void scrollrt_draw_cursor_item()
{
	int i, mx, my, col;
	BYTE *src, *dst;

	assert(! sgdwCursWdt);

	if (pcurs <= 0 || cursW == 0 || cursH == 0) {
		return;
	}

	if (sgbControllerActive && pcurs != CURSOR_TELEPORT && !invflag && (!chrflag || plr[myplr]._pStatPts <= 0)) {
		return;
	}

	mx = MouseX - 1;
	if (mx < 0 - cursW - 1) {
		return;
	} else if (mx > SCREEN_WIDTH - 1) {
		return;
	}
	my = MouseY - 1;
	if (my < 0 - cursH - 1) {
		return;
	} else if (my > SCREEN_HEIGHT - 1) {
		return;
	}

	sgdwCursX = mx;
	sgdwCursWdt = sgdwCursX + cursW + 1;
	if (sgdwCursWdt > SCREEN_WIDTH - 1) {
		sgdwCursWdt = SCREEN_WIDTH - 1;
	}
	sgdwCursX &= ~3;
	sgdwCursWdt |= 3;
	sgdwCursWdt -= sgdwCursX;
	sgdwCursWdt++;

	sgdwCursY = my;
	sgdwCursHgt = sgdwCursY + cursH + 1;
	if (sgdwCursHgt > SCREEN_HEIGHT - 1) {
		sgdwCursHgt = SCREEN_HEIGHT - 1;
	}
	sgdwCursHgt -= sgdwCursY;
	sgdwCursHgt++;

	assert(sgdwCursWdt * sgdwCursHgt < sizeof sgSaveBack);
	assert(gpBuffer);
	dst = sgSaveBack;
	src = &gpBuffer[SCREENXY(sgdwCursX, sgdwCursY)];

	for (i = sgdwCursHgt; i != 0; i--, dst += sgdwCursWdt, src += BUFFER_WIDTH) {
		memcpy(dst, src, sgdwCursWdt);
	}

	mx++;
	my++;
	gpBufEnd = &gpBuffer[BUFFER_WIDTH * (SCREEN_HEIGHT + SCREEN_Y) - cursW - 2];