Method DrawSmallMapColumn

src/smallmap_gui.cpp:910–943

* Draws one column of tiles of the small map in a certain mode onto the screen buffer, skipping the shifted rows in between. * * @param dst Pointer to a part of the screen buffer to write to. * @param xc The X coordinate of the first tile in the column. * @param yc The Y coordinate of the first tile in the column * @param pitch Number of pixels to advance in the screen buffer each time a

	 * @note If pixel position is below \c 0, skip drawing.
	 */
	void DrawSmallMapColumn(void *dst, uint xc, uint yc, int pitch, int reps, int start_pos, int end_pos, Blitter *blitter) const
	{
		void *dst_ptr_abs_end = blitter->MoveTo(_screen.dst_ptr, 0, _screen.height);
		uint min_xy = _settings_game.construction.freeform_edges ? 1 : 0;

		do {
			/* Check if the tile (xc,yc) is within the map range */
			if (xc >= Map::MaxX() || yc >= Map::MaxY()) continue;

			/* Check if the dst pointer points to a pixel inside the screen buffer */
			if (dst < _screen.dst_ptr) continue;
			if (dst >= dst_ptr_abs_end) continue;

			/* Construct tilearea covered by (xc, yc, xc + this->zoom, yc + this->zoom) such that it is within min_xy limits. */
			TileArea ta;
			if (min_xy == 1 && (xc == 0 || yc == 0)) {
				if (this->zoom == 1) continue; // The tile area is empty, don't draw anything.

				ta = TileArea(TileXY(std::max(min_xy, xc), std::max(min_xy, yc)), this->zoom - (xc == 0), this->zoom - (yc == 0));
			} else {
				ta = TileArea(TileXY(xc, yc), this->zoom, this->zoom);
			}
			ta.ClampToMap(); // Clamp to map boundaries (may contain MP_VOID tiles!).

			uint32_t val = this->GetTileColours(ta);
			uint8_t *val8 = (uint8_t *)&val;
			int idx = std::max(0, -start_pos);
			for (int pos = std::max(0, start_pos); pos < end_pos; pos++) {
				blitter->SetPixel(dst, idx, 0, PixelColour{val8[idx]});
				idx++;
			}
		/* Switch to next tile in the column */
		} while (xc += this->zoom, yc += this->zoom, dst = blitter->MoveTo(dst, pitch, 0), --reps != 0);
	}

	/**
	 * Adds vehicles to the smallmap.