spritefontcache.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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "../stdafx.h"
#include "../fontcache.h"
#include "../gfx_layout.h"
#include "../spritecache.h"
#include "../string_func.h"
#include "../zoom_func.h"
#include "spritefontcache.h"
 
#include "../table/sprites.h"
#include "../table/control_codes.h"
#include "../table/unicode.h"
 
#include "../safeguards.h"
 
static const int ASCII_LETTERSTART = 32; 

static int ScaleFontTrad(int value)
{
  return UnScaleByZoom(value * ZOOM_BASE, _font_zoom);
}
 
static std::array<std::unordered_map<char32_t, SpriteID>, FS_END> _char_maps{}; 

static SpriteID GetUnicodeGlyph(FontSize fs, char32_t key)
{
  auto found = _char_maps[fs].find(key);
  if (found != std::end(_char_maps[fs])) return found->second;
  return 0;
}

void SetUnicodeGlyph(FontSize fs, char32_t key, SpriteID sprite)
{
  _char_maps[fs][key] = sprite;
}

void InitializeUnicodeGlyphMap(FontSize fs)
{
  /* Clear out existing glyph map if it exists */
  _char_maps[fs].clear();
 
  SpriteID base;
  switch (fs) {
    default: NOT_REACHED();
    case FS_MONO:   // Use normal as default for mono spaced font
    case FS_NORMAL: base = SPR_ASCII_SPACE;       break;
    case FS_SMALL:  base = SPR_ASCII_SPACE_SMALL; break;
    case FS_LARGE:  base = SPR_ASCII_SPACE_BIG;   break;
  }
 
  for (uint i = ASCII_LETTERSTART; i < 256; i++) {
    SpriteID sprite = base + i - ASCII_LETTERSTART;
    if (!SpriteExists(sprite)) continue;
    SetUnicodeGlyph(fs, i, sprite);
    SetUnicodeGlyph(fs, i + SCC_SPRITE_START, sprite);
  }
 
  /* Modify map to move non-standard glyphs to a better unicode codepoint. */
  for (const auto &unicode_map : _default_unicode_map) {
    uint8_t key = unicode_map.key;
    if (key == CLRA) {
      /* Clear the glyph. This happens if the glyph at this code point
       * is non-standard and should be accessed by an SCC_xxx enum
       * entry only. */
      SetUnicodeGlyph(fs, unicode_map.code, 0);
    } else {
      SpriteID sprite = base + key - ASCII_LETTERSTART;
      if (!SpriteExists(sprite)) continue;
      SetUnicodeGlyph(fs, unicode_map.code, sprite);
    }
  }
}

void InitializeUnicodeGlyphMap()
{
  for (FontSize fs = FS_BEGIN; fs < FS_END; fs++) {
    InitializeUnicodeGlyphMap(fs);
  }
}

SpriteFontCache::SpriteFontCache(FontSize fs) : FontCache(fs)
{
  this->height = ScaleGUITrad(FontCache::GetDefaultFontHeight(this->fs));
  this->ascender = (this->height - ScaleFontTrad(FontCache::GetDefaultFontHeight(this->fs))) / 2;
}
 
void SpriteFontCache::ClearFontCache()
{
  Layouter::ResetFontCache(this->fs);
  this->height = ScaleGUITrad(FontCache::GetDefaultFontHeight(this->fs));
  this->ascender = (this->height - ScaleFontTrad(FontCache::GetDefaultFontHeight(this->fs))) / 2;
}
 
const Sprite *SpriteFontCache::GetGlyph(GlyphID key)
{
  SpriteID sprite = static_cast<SpriteID>(key & ~SPRITE_GLYPH);
  if (sprite == 0) sprite = GetUnicodeGlyph(this->fs, '?');
  return GetSprite(sprite, SpriteType::Font);
}
 
uint SpriteFontCache::GetGlyphWidth(GlyphID key)
{
  SpriteID sprite = static_cast<SpriteID>(key & ~SPRITE_GLYPH);
  if (sprite == 0) sprite = GetUnicodeGlyph(this->fs, '?');
  return SpriteExists(sprite) ? GetSprite(sprite, SpriteType::Font)->width + ScaleFontTrad(this->fs != FS_NORMAL ? 1 : 0) : 0;
}
 
GlyphID SpriteFontCache::MapCharToGlyph(char32_t key, [[maybe_unused]] bool allow_fallback)
{
  assert(IsPrintable(key));
  SpriteID sprite = GetUnicodeGlyph(this->fs, key);
  if (sprite == 0) return 0;
  return SPRITE_GLYPH | sprite;
}
 
bool SpriteFontCache::GetDrawGlyphShadow()
{
  return false;
}
 
class SpriteFontCacheFactory : public FontCacheFactory {
public:
  SpriteFontCacheFactory() : FontCacheFactory("sprite", "Sprite font provider") {}
 
  std::unique_ptr<FontCache> LoadFont(FontSize fs, FontType fonttype) const override
  {
    if (fonttype != FontType::Sprite) return nullptr;
 
    return std::make_unique<SpriteFontCache>(fs);
  }
 
  bool FindFallbackFont(struct FontCacheSettings *, const std::string &, class MissingGlyphSearcher *) const override
  {
    return false;
  }
 
private:
  static SpriteFontCacheFactory instance;
};
 
/* static */ SpriteFontCacheFactory SpriteFontCacheFactory::instance;