Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef GFX_TextRenderer_H
       7             : #define GFX_TextRenderer_H
       8             : 
       9             : #include "mozilla/EnumeratedArray.h"
      10             : #include "mozilla/gfx/2D.h"
      11             : #include "mozilla/UniquePtr.h"
      12             : #include "nsISupportsImpl.h"
      13             : #include <string>
      14             : 
      15             : namespace mozilla {
      16             : namespace layers {
      17             : 
      18             : class Compositor;
      19             : class TextureSource;
      20             : class TextureSourceProvider;
      21             : struct FontBitmapInfo;
      22             : 
      23             : class TextRenderer
      24             : {
      25             :   ~TextRenderer();
      26             : 
      27             : public:
      28           1 :   NS_INLINE_DECL_REFCOUNTING(TextRenderer)
      29             : 
      30             :   enum class FontType {
      31             :     Default,
      32             :     FixedWidth,
      33             :     NumTypes
      34             :   };
      35             : 
      36           1 :   explicit TextRenderer()
      37           1 :   {}
      38             : 
      39             :   RefPtr<TextureSource>
      40             :   RenderText(TextureSourceProvider* aProvider,
      41             :              const std::string& aText,
      42             :              uint32_t aTextSize,
      43             :              uint32_t aTargetPixelWidth,
      44             :              FontType aFontType);
      45             : 
      46             :   void RenderText(Compositor* aCompositor,
      47             :                   const std::string& aText,
      48             :                   const gfx::IntPoint& aOrigin,
      49             :                   const gfx::Matrix4x4& aTransform, uint32_t aTextSize,
      50             :                   uint32_t aTargetPixelWidth,
      51             :                   FontType aFontType = FontType::Default);
      52             : 
      53           0 :   struct FontCache {
      54             :     ~FontCache();
      55             :     RefPtr<gfx::DataSourceSurface> mGlyphBitmaps;
      56             :     gfx::DataSourceSurface::MappedSurface mMap;
      57             :     const FontBitmapInfo* mInfo;
      58             :   };
      59             : 
      60             : protected:
      61             :   // Note that this may still fail to set mGlyphBitmaps to a valid value
      62             :   // if the underlying CreateDataSourceSurface fails for some reason.
      63             :   bool EnsureInitialized(FontType aType);
      64             : 
      65             :   static const FontBitmapInfo* GetFontInfo(FontType aType);
      66             : 
      67             : private:
      68             :   EnumeratedArray<FontType, FontType::NumTypes, UniquePtr<FontCache>> mFonts;
      69             : };
      70             : 
      71           0 : struct FontBitmapInfo {
      72             :   Maybe<unsigned int> mGlyphWidth;
      73             :   Maybe<const unsigned short*> mGlyphWidths;
      74             :   unsigned int mTextureWidth;
      75             :   unsigned int mTextureHeight;
      76             :   unsigned int mCellWidth;
      77             :   unsigned int mCellHeight;
      78             :   unsigned int mFirstChar;
      79             :   const unsigned char* mPNG;
      80             :   size_t mPNGLength;
      81             : 
      82           0 :   unsigned int GetGlyphWidth(char aGlyph) const {
      83           0 :     if (mGlyphWidth) {
      84           0 :       return mGlyphWidth.value();
      85             :     }
      86           0 :     MOZ_ASSERT(unsigned(aGlyph) >= mFirstChar);
      87           0 :     return mGlyphWidths.value()[unsigned(aGlyph) - mFirstChar];
      88             :   }
      89             : };
      90             : 
      91             : } // namespace layers
      92             : } // namespace mozilla
      93             : 
      94             : #endif