import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

gfx/2d/NativeFontResourceGDI.cpp

@@ -0,0 +1,63 @@
+/* -*- 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 "NativeFontResourceGDI.h"
+
+#include "Logging.h"
+#include "mozilla/RefPtr.h"
+#include "ScaledFontWin.h"
+
+namespace mozilla {
+namespace gfx {
+
+/* static */
+already_AddRefed<NativeFontResourceGDI>
+NativeFontResourceGDI::Create(uint8_t *aFontData, uint32_t aDataLength,
+                              bool aNeedsCairo)
+{
+  DWORD numberOfFontsAdded;
+  HANDLE fontResourceHandle = ::AddFontMemResourceEx(aFontData, aDataLength,
+                                                     0, &numberOfFontsAdded);
+  if (!fontResourceHandle) {
+    gfxWarning() << "Failed to add memory font resource.";
+    return nullptr;
+  }
+
+  RefPtr<NativeFontResourceGDI> fontResouce =
+    new NativeFontResourceGDI(fontResourceHandle, aNeedsCairo);
+
+  return fontResouce.forget();
+}
+
+NativeFontResourceGDI::~NativeFontResourceGDI()
+{
+  ::RemoveFontMemResourceEx(mFontResourceHandle);
+}
+
+already_AddRefed<ScaledFont>
+NativeFontResourceGDI::CreateScaledFont(uint32_t aIndex, Float aGlyphSize,
+                                        const uint8_t* aInstanceData, uint32_t aInstanceDataLength)
+{
+  if (aInstanceDataLength < sizeof(LOGFONT)) {
+    gfxWarning() << "GDI scaled font instance data is truncated.";
+    return nullptr;
+  }
+
+  const LOGFONT* logFont = reinterpret_cast<const LOGFONT*>(aInstanceData);
+
+  // Constructor for ScaledFontWin dereferences and copies the LOGFONT, so we
+  // are safe to pass this reference.
+  RefPtr<ScaledFontBase> scaledFont = new ScaledFontWin(logFont, aGlyphSize);
+  if (mNeedsCairo && !scaledFont->PopulateCairoScaledFont()) {
+    gfxWarning() << "Unable to create cairo scaled font GDI font.";
+    return nullptr;
+  }
+
+  return scaledFont.forget();
+}
+
+} // gfx
+} // mozilla