Method DrawSmallMap

src/smallmap_gui.cpp:1057–1116

* Draws the small map. * * Basically, the small map is draw column of pixels by column of pixels. The pixels * are drawn directly into the screen buffer. The final map is drawn in multiple passes. * The passes are: * The colours of tiles in the different modes. * Town names (optional) * * @param dpi pointer to pixel to write onto */

	 * @param dpi pointer to pixel to write onto
	 */
	void DrawSmallMap(DrawPixelInfo *dpi) const
	{
		Blitter *blitter = BlitterFactory::GetCurrentBlitter();
		AutoRestoreBackup dpi_backup(_cur_dpi, dpi);

		/* Clear it */
		GfxFillRect(dpi->left, dpi->top, dpi->left + dpi->width - 1, dpi->top + dpi->height - 1, PC_BLACK);

		/* Which tile is displayed at (dpi->left, dpi->top)? */
		int dx;
		Point tile = this->PixelToTile(dpi->left, dpi->top, &dx);
		int tile_x = this->scroll_x / (int)TILE_SIZE + tile.x;
		int tile_y = this->scroll_y / (int)TILE_SIZE + tile.y;

		void *ptr = blitter->MoveTo(dpi->dst_ptr, -dx - 4, 0);
		int x = - dx - 4;
		int y = 0;

		for (;;) {
			/* Distance from left edge */
			if (x >= -3) {
				if (x >= dpi->width) break; // Exit the loop.

				int end_pos = std::min(dpi->width, x + 4);
				int reps = (dpi->height - y + 1) / 2; // Number of lines.
				if (reps > 0) {
					this->DrawSmallMapColumn(ptr, tile_x, tile_y, dpi->pitch * 2, reps, x, end_pos, blitter);
				}
			}

			if (y == 0) {
				tile_y += this->zoom;
				y++;
				ptr = blitter->MoveTo(ptr, 0, 1);
			} else {
				tile_x -= this->zoom;
				y--;
				ptr = blitter->MoveTo(ptr, 0, -1);
			}
			ptr = blitter->MoveTo(ptr, 2, 0);
			x += 2;
		}

		/* Draw vehicles */
		if (this->map_type == SMT_CONTOUR || this->map_type == SMT_VEHICLES) this->DrawVehicles(dpi, blitter);

		/* Draw link stat overlay */
		if (this->map_type == SMT_LINKSTATS) this->overlay->Draw(dpi);

		const int map_labels_vertical_padding = ScaleGUITrad(2);

		/* Draw town names */
		if (this->show_towns) this->DrawTowns(dpi, map_labels_vertical_padding);

		/* Draw industry names */
		if (this->show_ind_names) this->DrawIndustryNames(dpi, map_labels_vertical_padding);

		/* Draw map indicators */