Function GUI_DrawScreen

src/gui/gui.c:4554–4648

* Draw the screen. * This also handles animation tick and other viewport related activity. * @param screenID The screen to draw on. */

 * @param screenID The screen to draw on.
 */
void GUI_DrawScreen(Screen screenID)
{
	static uint32 s_timerViewportMessage = 0;
	bool hasScrolled = false;
	Screen oldScreenID;
	uint16 xpos;

	if (g_selectionType == SELECTIONTYPE_MENTAT) return;
	if (g_selectionType == SELECTIONTYPE_DEBUG) return;
	if (g_selectionType == SELECTIONTYPE_UNKNOWN6) return;
	if (g_selectionType == SELECTIONTYPE_INTRO) return;

	oldScreenID = GFX_Screen_SetActive(screenID);

	if (!GFX_Screen_IsActive(SCREEN_0)) g_viewport_forceRedraw = true;

	Explosion_Tick();
	Animation_Tick();
	Unit_Sort();

	if (!g_viewport_forceRedraw && g_viewportPosition != g_minimapPosition) {
		uint16 viewportX = Tile_GetPackedX(g_viewportPosition);
		uint16 viewportY = Tile_GetPackedY(g_viewportPosition);
		int16 xOffset = Tile_GetPackedX(g_minimapPosition) - viewportX; /* Horizontal offset between viewport and minimap. */
		int16 yOffset = Tile_GetPackedY(g_minimapPosition) - viewportY; /* Vertical offset between viewport and minmap. */

		/* Overlap remaining in tiles. */
		int16 xOverlap = 15 - abs(xOffset);
		int16 yOverlap = 10 - abs(yOffset);

		int16 x, y;

		if (xOverlap < 1 || yOverlap < 1) {
			g_viewport_forceRedraw = true;
		} else if (!g_viewport_forceRedraw && (xOverlap != 15 || yOverlap != 10)) {
			Map_SetSelectionObjectPosition(0xFFFF);
			hasScrolled = true;

			GUI_Mouse_Hide_InWidget(2);

			GUI_Screen_Copy(max(-xOffset << 1, 0), 40 + max(-yOffset << 4, 0), max(0, xOffset << 1), 40 + max(0, yOffset << 4), xOverlap << 1, yOverlap << 4, SCREEN_0, SCREEN_1);
		} else {
			g_viewport_forceRedraw = true;
		}

		xOffset = max(0, xOffset);
		yOffset = max(0, yOffset);

		for (y = 0; y < 10; y++) {
			uint16 mapYBase = (y + viewportY) << 6;

			for (x = 0; x < 15; x++) {
				if (x >= xOffset && (xOffset + xOverlap) > x && y >= yOffset && (yOffset + yOverlap) > y && !g_viewport_forceRedraw) continue;

				Map_Update(x + viewportX + mapYBase, 0, true);
			}
		}
	}