gfx/2d/NativeFontResourceGDI.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "NativeFontResourceGDI.h"
   8
   9 #include "Logging.h"
  10 #include "mozilla/RefPtr.h"
  11 #include "ScaledFontWin.h"
  12 #include "UnscaledFontGDI.h"
  13
  14 namespace mozilla {
  15 namespace gfx {
  16
  17 /* static */
  18 already_AddRefed<NativeFontResourceGDI> NativeFontResourceGDI::Create(
  19     uint8_t* aFontData, uint32_t aDataLength) {
  20   DWORD numberOfFontsAdded;
  21   HANDLE fontResourceHandle =
  22       ::AddFontMemResourceEx(aFontData, aDataLength, 0, &numberOfFontsAdded);
  23   if (!fontResourceHandle) {
  24     gfxWarning() << "Failed to add memory font resource.";
  25     return nullptr;
  26   }
  27
  28   RefPtr<NativeFontResourceGDI> fontResouce =
  29       new NativeFontResourceGDI(fontResourceHandle, aDataLength);
  30
  31   return fontResouce.forget();
  32 }
  33
  34 NativeFontResourceGDI::~NativeFontResourceGDI() {
  35   ::RemoveFontMemResourceEx(mFontResourceHandle);
  36 }
  37
  38 already_AddRefed<UnscaledFont> NativeFontResourceGDI::CreateUnscaledFont(
  39     uint32_t aIndex, const uint8_t* aInstanceData,
  40     uint32_t aInstanceDataLength) {
  41   if (aInstanceDataLength < sizeof(LOGFONT)) {
  42     gfxWarning() << "GDI unscaled font instance data is truncated.";
  43     return nullptr;
  44   }
  45
  46   const LOGFONT* logFont = reinterpret_cast<const LOGFONT*>(aInstanceData);
  47   RefPtr<UnscaledFont> unscaledFont = new UnscaledFontGDI(*logFont);
  48   return unscaledFont.forget();
  49 }
  50
  51 }  // namespace gfx
  52 }  // namespace mozilla