1 files changed, 58 insertions, 0 deletions
diff --git a/src/sprite.cpp b/src/sprite.cpp
new file mode 100644
index 000000000..1edaa2909
--- /dev/null
+++ b/src/sprite.cpp
@@ -0,0 +1,58 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file sprite.cpp Handling of sprites */
+
+#include "stdafx.h"
+#include "sprite.h"
+#include "tile_cmd.h"
+#include "viewport_func.h"
+
+#include "table/sprites.h"
+
+/**
+ * Draws a tile sprite sequence.
+ * @param ti The tile to draw on
+ * @param dts Sprite and subsprites to draw
+ * @param to The transparancy bit that toggles drawing of these sprites
+ * @param orig_offset Sprite-Offset for original sprites
+ * @param newgrf_offset Sprite-Offset for NewGRF defined sprites
+ * @param default_palette The default recolour sprite to use (typically company colour)
+ */
+void DrawCommonTileSeq(const TileInfo *ti, const DrawTileSprites *dts, TransparencyOption to, int32 orig_offset, uint32 newgrf_offset, SpriteID default_palette)
+{
+	const DrawTileSeqStruct *dtss;
+	foreach_draw_tile_seq(dtss, dts->seq) {
+		SpriteID image = dtss->image.sprite;
+
+		/* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
+		if (IsInvisibilitySet(to) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
+
+		if (newgrf_offset == 0 || HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) {
+			image += orig_offset;
+		} else {
+			image += newgrf_offset;
+		}
+
+		SpriteID pal = SpriteLayoutPaletteTransform(image, dtss->image.pal, default_palette);
+
+		if ((byte)dtss->delta_z != 0x80) {
+			AddSortableSpriteToDraw(
+				image, pal,
+				ti->x + dtss->delta_x, ti->y + dtss->delta_y,
+				dtss->size_x, dtss->size_y,
+				dtss->size_z, ti->z + dtss->delta_z,
+				!HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(to)
+			);
+		} else {
+			/* For stations and original spritelayouts delta_x and delta_y are signed */
+			AddChildSpriteScreen(image, pal, dtss->delta_x, dtss->delta_y, !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(to));
+		}
+	}
+}