/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GFX_TextRenderer_H

#define GFX_TextRenderer_H

#include "mozilla/EnumeratedArray.h"

#include "mozilla/gfx/2D.h"

#include "mozilla/UniquePtr.h"

#include "nsISupportsImpl.h"

#include <string>

namespace mozilla {

namespace layers {

class Compositor;

class TextureSource;

class TextureSourceProvider;

struct FontBitmapInfo;

class TextRenderer

{

  ~TextRenderer();

public:

  NS_INLINE_DECL_REFCOUNTING(TextRenderer)

  enum class FontType {

    Default,

    FixedWidth,

    NumTypes

  };

  explicit TextRenderer()

  {}

  RefPtr<TextureSource>

  RenderText(TextureSourceProvider* aProvider,

             const std::string& aText,

             uint32_t aTextSize,

             uint32_t aTargetPixelWidth,

             FontType aFontType);

  void RenderText(Compositor* aCompositor,

                  const std::string& aText,

                  const gfx::IntPoint& aOrigin,

                  const gfx::Matrix4x4& aTransform, uint32_t aTextSize,

                  uint32_t aTargetPixelWidth,

                  FontType aFontType = FontType::Default);

  struct FontCache {

    ~FontCache();

    RefPtr<gfx::DataSourceSurface> mGlyphBitmaps;

    gfx::DataSourceSurface::MappedSurface mMap;

    const FontBitmapInfo* mInfo;

  };

protected:

  // Note that this may still fail to set mGlyphBitmaps to a valid value

  // if the underlying CreateDataSourceSurface fails for some reason.

  bool EnsureInitialized(FontType aType);

  static const FontBitmapInfo* GetFontInfo(FontType aType);

private:

  EnumeratedArray<FontType, FontType::NumTypes, UniquePtr<FontCache>> mFonts;

};

struct FontBitmapInfo {

  Maybe<unsigned int> mGlyphWidth;

  Maybe<const unsigned short*> mGlyphWidths;

  unsigned int mTextureWidth;

  unsigned int mTextureHeight;

  unsigned int mCellWidth;

  unsigned int mCellHeight;

  unsigned int mFirstChar;

  const unsigned char* mPNG;

  size_t mPNGLength;

  unsigned int GetGlyphWidth(char aGlyph) const {

    if (mGlyphWidth) {

      return mGlyphWidth.value();

    }

    MOZ_ASSERT(unsigned(aGlyph) >= mFirstChar);

    return mGlyphWidths.value()[unsigned(aGlyph) - mFirstChar];

  }

};

} // namespace layers

} // namespace mozilla

#endif