Quelle ScaledFontWin.cpp Sprache: C

/* -*- 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/. */

#include "ScaledFontWin.h"
#include "UnscaledFontGDI.h"

#include "AutoHelpersWin.h"
#include "Logging.h"
#include "nsString.h"

#include "skia/include/ports/SkTypeface_win.h"

#include "cairo-win32.h"

#include "HelpersWinFonts.h"

namespace mozilla {
namespace gfx {

ScaledFontWin::ScaledFontWin(const LOGFONT* aFont,
                             const RefPtr<UnscaledFont>& aUnscaledFont,
                             Float aSize)
    : ScaledFontBase(aUnscaledFont, aSize), mLogFont(*aFont) {}

bool UnscaledFontGDI::GetFontFileData(FontFileDataOutput aDataCallback,
                                      void* aBaton) {
  AutoDC dc;
  AutoSelectFont font(dc.GetDC(), &mLogFont);

  // Check for a font collection first.
  uint32_t table = 0x66637474;  // 'ttcf'
  uint32_t tableSize = ::GetFontData(dc.GetDC(), table, 0, nullptr, 0);
  if (tableSize == GDI_ERROR) {
    // Try as if just a single font.
    table = 0;
    tableSize = ::GetFontData(dc.GetDC(), table, 0, nullptr, 0);
    if (tableSize == GDI_ERROR) {
      return false;
    }
  }

  UniquePtr<uint8_t[]> fontData(new uint8_t[tableSize]);

  uint32_t sizeGot =
      ::GetFontData(dc.GetDC(), table, 0, fontData.get(), tableSize);
  if (sizeGot != tableSize) {
    return false;
  }

  aDataCallback(fontData.get(), tableSize, 0, aBaton);
  return true;
}

bool ScaledFontWin::GetFontInstanceData(FontInstanceDataOutput aCb,
                                        void* aBaton) {
  aCb(reinterpret_cast<uint8_t*>(&mLogFont), sizeof(mLogFont), nullptr, 0,
      aBaton);
  return true;
}

bool UnscaledFontGDI::GetFontInstanceData(FontInstanceDataOutput aCb,
                                          void* aBaton) {
  aCb(reinterpret_cast<uint8_t*>(&mLogFont), sizeof(mLogFont), aBaton);
  return true;
}

bool UnscaledFontGDI::GetFontDescriptor(FontDescriptorOutput aCb,
                                        void* aBaton) {
  // Because all the callers of this function are preparing a recorded
  // event to be played back in another process, it's not helpful to ever
  // return a font descriptor, since it isn't meaningful in another
  // process. Those callers will always need to send full font data, and
  // returning false here will ensure that that happens.
  return false;
}

already_AddRefed<UnscaledFont> UnscaledFontGDI::CreateFromFontDescriptor(
    const uint8_t* aData, uint32_t aDataLength, uint32_t aIndex) {
  if (aDataLength < sizeof(LOGFONT)) {
    gfxWarning() << "GDI font descriptor is truncated.";
    return nullptr;
  }

  const LOGFONT* logFont = reinterpret_cast<const LOGFONT*>(aData);
  RefPtr<UnscaledFont> unscaledFont = new UnscaledFontGDI(*logFont);
  return unscaledFont.forget();
}

already_AddRefed<ScaledFont> UnscaledFontGDI::CreateScaledFont(
    Float aGlyphSize, const uint8_t* aInstanceData,
    uint32_t aInstanceDataLength, const FontVariation* aVariations,
    uint32_t aNumVariations) {
  if (aInstanceDataLength < sizeof(LOGFONT)) {
    gfxWarning() << "GDI unscaled font instance data is truncated.";
    return nullptr;
  }
  return MakeAndAddRef<ScaledFontWin>(
      reinterpret_cast<const LOGFONT*>(aInstanceData), this, aGlyphSize);
}

AntialiasMode ScaledFontWin::GetDefaultAAMode() {
  return GetSystemDefaultAAMode();
}

SkTypeface* ScaledFontWin::CreateSkTypeface() {
  return SkCreateTypefaceFromLOGFONT(mLogFont).release();
}

cairo_font_face_t* ScaledFontWin::CreateCairoFontFace(
    cairo_font_options_t* aFontOptions) {
  if (mLogFont.lfFaceName[0] == 0) {
    return nullptr;
  }
  return cairo_win32_font_face_create_for_logfontw(&mLogFont);
}

}  // namespace gfx
}  // namespace mozilla

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