sprite.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "sprite.h"
00014 #include "viewport_func.h"
00015 #include "landscape.h"
00016 #include "spritecache.h"
00017 #include "core/alloc_func.hpp"
00018 #include "core/mem_func.hpp"
00019 
00020 
00031 void DrawCommonTileSeq(const TileInfo *ti, const DrawTileSprites *dts, TransparencyOption to, int32 orig_offset, uint32 newgrf_offset, PaletteID default_palette, bool child_offset_is_unsigned)
00032 {
00033   bool parent_sprite_encountered = false;
00034   const DrawTileSeqStruct *dtss;
00035   bool skip_childs = false;
00036   foreach_draw_tile_seq(dtss, dts->seq) {
00037     SpriteID image = dtss->image.sprite;
00038     PaletteID pal = dtss->image.pal;
00039 
00040     if (skip_childs) {
00041       if (!dtss->IsParentSprite()) continue;
00042       skip_childs = false;
00043     }
00044 
00045     /* TTD sprite 0 means no sprite */
00046     if (GB(image, 0, SPRITE_WIDTH) == 0 && !HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
00047       skip_childs = dtss->IsParentSprite();
00048       continue;
00049     }
00050 
00051     /* Stop drawing sprite sequence once we meet a sprite that doesn't have to be opaque */
00052     if (IsInvisibilitySet(to) && !HasBit(image, SPRITE_MODIFIER_OPAQUE)) return;
00053 
00054     image += (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? newgrf_offset : orig_offset);
00055     if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += newgrf_offset;
00056 
00057     pal = SpriteLayoutPaletteTransform(image, pal, default_palette);
00058 
00059     if (dtss->IsParentSprite()) {
00060       parent_sprite_encountered = true;
00061       AddSortableSpriteToDraw(
00062         image, pal,
00063         ti->x + dtss->delta_x, ti->y + dtss->delta_y,
00064         dtss->size_x, dtss->size_y,
00065         dtss->size_z, ti->z + dtss->delta_z,
00066         !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(to)
00067       );
00068     } else {
00069       int offs_x = child_offset_is_unsigned ? (uint8)dtss->delta_x : dtss->delta_x;
00070       int offs_y = child_offset_is_unsigned ? (uint8)dtss->delta_y : dtss->delta_y;
00071       bool transparent = !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(to);
00072       if (parent_sprite_encountered) {
00073         AddChildSpriteScreen(image, pal, offs_x, offs_y, transparent);
00074       } else {
00075         if (transparent) {
00076           SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
00077           pal = PALETTE_TO_TRANSPARENT;
00078         }
00079         DrawGroundSprite(image, pal, NULL, offs_x, offs_y);
00080       }
00081     }
00082   }
00083 }
00084 
00095 void DrawCommonTileSeqInGUI(int x, int y, const DrawTileSprites *dts, int32 orig_offset, uint32 newgrf_offset, PaletteID default_palette, bool child_offset_is_unsigned)
00096 {
00097   const DrawTileSeqStruct *dtss;
00098   Point child_offset = {0, 0};
00099 
00100   bool skip_childs = false;
00101   foreach_draw_tile_seq(dtss, dts->seq) {
00102     SpriteID image = dtss->image.sprite;
00103     PaletteID pal = dtss->image.pal;
00104 
00105     if (skip_childs) {
00106       if (!dtss->IsParentSprite()) continue;
00107       skip_childs = false;
00108     }
00109 
00110     /* TTD sprite 0 means no sprite */
00111     if (GB(image, 0, SPRITE_WIDTH) == 0 && !HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
00112       skip_childs = dtss->IsParentSprite();
00113       continue;
00114     }
00115 
00116     image += (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? newgrf_offset : orig_offset);
00117     if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += newgrf_offset;
00118 
00119     pal = SpriteLayoutPaletteTransform(image, pal, default_palette);
00120 
00121     if (dtss->IsParentSprite()) {
00122       Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
00123       DrawSprite(image, pal, x + pt.x, y + pt.y);
00124 
00125       const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
00126       child_offset.x = pt.x + spr->x_offs;
00127       child_offset.y = pt.y + spr->y_offs;
00128     } else {
00129       int offs_x = child_offset_is_unsigned ? (uint8)dtss->delta_x : dtss->delta_x;
00130       int offs_y = child_offset_is_unsigned ? (uint8)dtss->delta_y : dtss->delta_y;
00131       DrawSprite(image, pal, x + child_offset.x + offs_x, y + child_offset.y + offs_y);
00132     }
00133   }
00134 }

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