gecko-dev/gfx/thebes/gfxDWriteCommon.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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_DWRITECOMMON_H
#define GFX_DWRITECOMMON_H

// Mozilla includes
#include "mozilla/MemoryReporting.h"
#include "mozilla/FontPropertyTypes.h"
#include "nscore.h"
#include "nsCOMPtr.h"
#include "cairo-features.h"
#include "gfxFontConstants.h"
#include "nsTArray.h"
#include "gfxWindowsPlatform.h"

#include <windows.h>
#include <dwrite.h>

static inline DWRITE_FONT_STRETCH DWriteFontStretchFromStretch(
    mozilla::FontStretch aStretch) {
  if (aStretch == mozilla::FontStretch::UltraCondensed()) {
    return DWRITE_FONT_STRETCH_ULTRA_CONDENSED;
  }
  if (aStretch == mozilla::FontStretch::ExtraCondensed()) {
    return DWRITE_FONT_STRETCH_EXTRA_CONDENSED;
  }
  if (aStretch == mozilla::FontStretch::Condensed()) {
    return DWRITE_FONT_STRETCH_CONDENSED;
  }
  if (aStretch == mozilla::FontStretch::SemiCondensed()) {
    return DWRITE_FONT_STRETCH_SEMI_CONDENSED;
  }
  if (aStretch == mozilla::FontStretch::Normal()) {
    return DWRITE_FONT_STRETCH_NORMAL;
  }
  if (aStretch == mozilla::FontStretch::SemiExpanded()) {
    return DWRITE_FONT_STRETCH_SEMI_EXPANDED;
  }
  if (aStretch == mozilla::FontStretch::Expanded()) {
    return DWRITE_FONT_STRETCH_EXPANDED;
  }
  if (aStretch == mozilla::FontStretch::ExtraExpanded()) {
    return DWRITE_FONT_STRETCH_EXTRA_EXPANDED;
  }
  if (aStretch == mozilla::FontStretch::UltraExpanded()) {
    return DWRITE_FONT_STRETCH_ULTRA_EXPANDED;
  }
  return DWRITE_FONT_STRETCH_UNDEFINED;
}

static inline mozilla::FontStretch FontStretchFromDWriteStretch(
    DWRITE_FONT_STRETCH aStretch) {
  switch (aStretch) {
    case DWRITE_FONT_STRETCH_ULTRA_CONDENSED:
      return mozilla::FontStretch::UltraCondensed();
    case DWRITE_FONT_STRETCH_EXTRA_CONDENSED:
      return mozilla::FontStretch::ExtraCondensed();
    case DWRITE_FONT_STRETCH_CONDENSED:
      return mozilla::FontStretch::Condensed();
    case DWRITE_FONT_STRETCH_SEMI_CONDENSED:
      return mozilla::FontStretch::SemiCondensed();
    case DWRITE_FONT_STRETCH_NORMAL:
      return mozilla::FontStretch::Normal();
    case DWRITE_FONT_STRETCH_SEMI_EXPANDED:
      return mozilla::FontStretch::SemiExpanded();
    case DWRITE_FONT_STRETCH_EXPANDED:
      return mozilla::FontStretch::Expanded();
    case DWRITE_FONT_STRETCH_EXTRA_EXPANDED:
      return mozilla::FontStretch::ExtraExpanded();
    case DWRITE_FONT_STRETCH_ULTRA_EXPANDED:
      return mozilla::FontStretch::UltraExpanded();
    default:
      return mozilla::FontStretch::Normal();
  }
}

class gfxDWriteFontFileLoader : public IDWriteFontFileLoader {
 public:
  gfxDWriteFontFileLoader() {}

  // IUnknown interface
  IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) {
    if (iid == __uuidof(IDWriteFontFileLoader)) {
      *ppObject = static_cast<IDWriteFontFileLoader*>(this);
      return S_OK;
    } else if (iid == __uuidof(IUnknown)) {
      *ppObject = static_cast<IUnknown*>(this);
      return S_OK;
    } else {
      return E_NOINTERFACE;
    }
  }

  IFACEMETHOD_(ULONG, AddRef)() { return 1; }

  IFACEMETHOD_(ULONG, Release)() { return 1; }

  // IDWriteFontFileLoader methods
  /**
   * Important! Note the key here -has- to be a pointer to a uint64_t.
   */
  virtual HRESULT STDMETHODCALLTYPE CreateStreamFromKey(
      void const* fontFileReferenceKey, UINT32 fontFileReferenceKeySize,
      OUT IDWriteFontFileStream** fontFileStream);

  /**
   * Gets the singleton loader instance. Note that when using this font
   * loader, the key must be a pointer to a unint64_t.
   */
  static IDWriteFontFileLoader* Instance() {
    if (!mInstance) {
      mInstance = new gfxDWriteFontFileLoader();
      mozilla::gfx::Factory::GetDWriteFactory()->RegisterFontFileLoader(
          mInstance);
    }
    return mInstance;
  }

  /**
   * Creates a IDWriteFontFile and IDWriteFontFileStream from aFontData.
   * The data from aFontData will be copied internally, so the caller
   * is free to dispose of it once this method returns.
   *
   * @param aFontData the font data for the custom font file
   * @param aLength length of the font data
   * @param aFontFile out param for the created font file
   * @param aFontFileStream out param for the corresponding stream
   * @return HRESULT of internal calls
   */
  static HRESULT CreateCustomFontFile(const uint8_t* aFontData,
                                      uint32_t aLength,
                                      IDWriteFontFile** aFontFile,
                                      IDWriteFontFileStream** aFontFileStream);

  size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;

 private:
  static IDWriteFontFileLoader* mInstance;
};

#endif /* GFX_DWRITECOMMON_H */