sprite.cpp

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/*
 * 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/>.
 */
 
#include "stdafx.h"
#include "sprite.h"
#include "viewport_func.h"
#include "landscape.h"
#include "spritecache.h"
#include "zoom_func.h"
 
#include "safeguards.h"
 
 
void DrawCommonTileSeq(const TileInfo *ti, const DrawTileSprites *dts, TransparencyOption to, int32_t orig_offset, uint32_t newgrf_offset, PaletteID default_palette, bool child_offset_is_unsigned)
{
  bool parent_sprite_encountered = false;
  const DrawTileSeqStruct *dtss;
  bool skip_childs = false;
  foreach_draw_tile_seq(dtss, dts->seq) {
    SpriteID image = dtss->image.sprite;
    PaletteID pal = dtss->image.pal;
 
    if (skip_childs) {
      if (!dtss->IsParentSprite()) continue;
      skip_childs = false;
    }
 
    /* TTD sprite 0 means no sprite */
    if ((GB(image, 0, SPRITE_WIDTH) == 0 && !HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) ||
        (IsInvisibilitySet(to) && !HasBit(image, SPRITE_MODIFIER_OPAQUE))) {
      skip_childs = dtss->IsParentSprite();
      continue;
    }
 
    image += (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? newgrf_offset : orig_offset);
    if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += newgrf_offset;
 
    pal = SpriteLayoutPaletteTransform(image, pal, default_palette);
 
    if (dtss->IsParentSprite()) {
      parent_sprite_encountered = true;
      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 {
      int offs_x = child_offset_is_unsigned ? (uint8_t)dtss->delta_x : dtss->delta_x;
      int offs_y = child_offset_is_unsigned ? (uint8_t)dtss->delta_y : dtss->delta_y;
      bool transparent = !HasBit(image, SPRITE_MODIFIER_OPAQUE) && IsTransparencySet(to);
      if (parent_sprite_encountered) {
        AddChildSpriteScreen(image, pal, offs_x, offs_y, transparent);
      } else {
        if (transparent) {
          SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
          pal = PALETTE_TO_TRANSPARENT;
        }
        DrawGroundSprite(image, pal, nullptr, offs_x, offs_y);
      }
    }
  }
}
 
void DrawCommonTileSeqInGUI(int x, int y, const DrawTileSprites *dts, int32_t orig_offset, uint32_t newgrf_offset, PaletteID default_palette, bool child_offset_is_unsigned)
{
  const DrawTileSeqStruct *dtss;
  Point child_offset = {0, 0};
 
  bool skip_childs = false;
  foreach_draw_tile_seq(dtss, dts->seq) {
    SpriteID image = dtss->image.sprite;
    PaletteID pal = dtss->image.pal;
 
    if (skip_childs) {
      if (!dtss->IsParentSprite()) continue;
      skip_childs = false;
    }
 
    /* TTD sprite 0 means no sprite */
    if (GB(image, 0, SPRITE_WIDTH) == 0 && !HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
      skip_childs = dtss->IsParentSprite();
      continue;
    }
 
    image += (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE) ? newgrf_offset : orig_offset);
    if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += newgrf_offset;
 
    pal = SpriteLayoutPaletteTransform(image, pal, default_palette);
 
    if (dtss->IsParentSprite()) {
      Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
      DrawSprite(image, pal, x + UnScaleGUI(pt.x), y + UnScaleGUI(pt.y));
 
      const Sprite *spr = GetSprite(image & SPRITE_MASK, SpriteType::Normal);
      child_offset.x = UnScaleGUI(pt.x + spr->x_offs);
      child_offset.y = UnScaleGUI(pt.y + spr->y_offs);
    } else {
      int offs_x = child_offset_is_unsigned ? (uint8_t)dtss->delta_x : dtss->delta_x;
      int offs_y = child_offset_is_unsigned ? (uint8_t)dtss->delta_y : dtss->delta_y;
      DrawSprite(image, pal, x + child_offset.x + ScaleSpriteTrad(offs_x), y + child_offset.y + ScaleSpriteTrad(offs_y));
    }
  }
}