src/sprite.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file sprite.cpp Handling of sprites */
  11
  12 #include "stdafx.h"
  13 #include "sprite.h"
  14 #include "viewport_func.h"
  15 #include "landscape.h"
  16 #include "spritecache.h"
  17 #include "zoom_func.h"
  18
  19
  20 /**
  21  * Draws a tile sprite sequence.
  22  * @param ti The tile to draw on
  23  * @param seq Sprite and subsprites to draw
  24  * @param to The transparency bit that toggles drawing of these sprites
  25  * @param orig_offset Sprite-Offset for original sprites
  26  * @param newgrf_offset Sprite-Offset for NewGRF defined sprites
  27  * @param default_palette The default recolour sprite to use (typically company colour)
  28  * @param child_offset_is_unsigned Whether child sprite offsets are interpreted signed or unsigned
  29  */
  30 void DrawCommonTileSeq (const TileInfo *ti, const DrawTileSeqStruct *seq,
  31         TransparencyOption to, int32 orig_offset, uint32 newgrf_offset,
  32         PaletteID default_palette, bool child_offset_is_unsigned)
  33 {
  34         bool parent_sprite_encountered = false;
  35         const DrawTileSeqStruct *dtss;
  36         bool skip_childs = false;
  37         foreach_draw_tile_seq(dtss, seq) {
  38                 SpriteID image = dtss->image.sprite;
  39                 PaletteID pal = dtss->image.pal;
  40
  41                 if (skip_childs) {
  42                         if (!dtss->IsParentSprite()) continue;
  43                         skip_childs = false;
  44                 }
  45
  46                 /* TTD sprite 0 means no sprite */
  47                 if ((GB(image, 0, SPRITE_WIDTH) == 0 && !HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) ||
  48                                 (IsInvisibilitySet(to) && !HasBit(image, SPRITE_MODIFIER_OPAQUE))) {
  49                         skip_childs = dtss->IsParentSprite();
  50                         continue;
  51                 }
  52
  53                 image += (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? newgrf_offset : orig_offset);
  54                 if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += newgrf_offset;
  55
  56                 pal = SpriteLayoutPaletteTransform(image, pal, default_palette);
  57
  58                 bool transparent = !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(to);
  59                 if (dtss->IsParentSprite()) {
  60                         parent_sprite_encountered = true;
  61                         AddSortableSpriteToDraw (ti->vd,
  62                                 image, pal,
  63                                 ti->x + dtss->delta_x, ti->y + dtss->delta_y,
  64                                 dtss->size_x, dtss->size_y,
  65                                 dtss->size_z, ti->z + dtss->delta_z,
  66                                 transparent
  67                         );
  68                 } else {
  69                         int offs_x = child_offset_is_unsigned ? (uint8)dtss->delta_x : dtss->delta_x;
  70                         int offs_y = child_offset_is_unsigned ? (uint8)dtss->delta_y : dtss->delta_y;
  71                         if (parent_sprite_encountered) {
  72                                 AddChildSpriteScreen (ti->vd, image, pal, offs_x, offs_y, transparent);
  73                         } else {
  74                                 if (transparent) {
  75                                         SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
  76                                         pal = PALETTE_TO_TRANSPARENT;
  77                                 }
  78                                 DrawGroundSprite (ti, image, pal, NULL, offs_x, offs_y);
  79                         }
  80                 }
  81         }
  82 }
  83
  84 /**
  85  * Draws a tile sprite sequence in the GUI
  86  * @param dpi Area to draw on.
  87  * @param x X position to draw to
  88  * @param y Y position to draw to
  89  * @param seq Sprite and subsprites to draw
  90  * @param orig_offset Sprite-Offset for original sprites
  91  * @param newgrf_offset Sprite-Offset for NewGRF defined sprites
  92  * @param default_palette The default recolour sprite to use (typically company colour)
  93  * @param child_offset_is_unsigned Whether child sprite offsets are interpreted signed or unsigned
  94  */
  95 void DrawCommonTileSeqInGUI (BlitArea *dpi, int x, int y,
  96         const DrawTileSeqStruct *seq, int32 orig_offset, uint32 newgrf_offset,
  97         PaletteID default_palette, bool child_offset_is_unsigned)
  98 {
  99         const DrawTileSeqStruct *dtss;
 100         Point child_offset = {0, 0};
 101
 102         bool skip_childs = false;
 103         foreach_draw_tile_seq(dtss, seq) {
 104                 SpriteID image = dtss->image.sprite;
 105                 PaletteID pal = dtss->image.pal;
 106
 107                 if (skip_childs) {
 108                         if (!dtss->IsParentSprite()) continue;
 109                         skip_childs = false;
 110                 }
 111
 112                 /* TTD sprite 0 means no sprite */
 113                 if (GB(image, 0, SPRITE_WIDTH) == 0 && !HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
 114                         skip_childs = dtss->IsParentSprite();
 115                         continue;
 116                 }
 117
 118                 image += (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? newgrf_offset : orig_offset);
 119                 if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += newgrf_offset;
 120
 121                 pal = SpriteLayoutPaletteTransform(image, pal, default_palette);
 122
 123                 if (dtss->IsParentSprite()) {
 124                         Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
 125                         DrawSprite (dpi, image, pal, x + UnScaleGUI(pt.x), y + UnScaleGUI(pt.y));
 126
 127                         const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
 128                         child_offset.x = UnScaleGUI(pt.x + spr->x_offs);
 129                         child_offset.y = UnScaleGUI(pt.y + spr->y_offs);
 130                 } else {
 131                         int offs_x = child_offset_is_unsigned ? (uint8)dtss->delta_x : dtss->delta_x;
 132                         int offs_y = child_offset_is_unsigned ? (uint8)dtss->delta_y : dtss->delta_y;
 133                         DrawSprite (dpi, image, pal, x + child_offset.x + ScaleGUITrad(offs_x), y + child_offset.y + ScaleGUITrad(offs_y));
 134                 }
 135         }
 136 }