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ScaledFontWin.cpp (3960B)

      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 "ScaledFontWin.h"
      8 #include "UnscaledFontGDI.h"
      9 
     10 #include "AutoHelpersWin.h"
     11 #include "Logging.h"
     12 #include "nsString.h"
     13 
     14 #include "skia/include/ports/SkTypeface_win.h"
     15 
     16 #include "cairo-win32.h"
     17 
     18 #include "HelpersWinFonts.h"
     19 
     20 namespace mozilla {
     21 namespace gfx {
     22 
     23 ScaledFontWin::ScaledFontWin(const LOGFONT* aFont,
     24                             const RefPtr<UnscaledFont>& aUnscaledFont,
     25                             Float aSize)
     26    : ScaledFontBase(aUnscaledFont, aSize), mLogFont(*aFont) {}
     27 
     28 bool UnscaledFontGDI::GetFontFileData(FontFileDataOutput aDataCallback,
     29                                      void* aBaton) {
     30  AutoDC dc;
     31  AutoSelectFont font(dc.GetDC(), &mLogFont);
     32 
     33  // Check for a font collection first.
     34  uint32_t table = 0x66637474;  // 'ttcf'
     35  uint32_t tableSize = ::GetFontData(dc.GetDC(), table, 0, nullptr, 0);
     36  if (tableSize == GDI_ERROR) {
     37    // Try as if just a single font.
     38    table = 0;
     39    tableSize = ::GetFontData(dc.GetDC(), table, 0, nullptr, 0);
     40    if (tableSize == GDI_ERROR) {
     41      return false;
     42    }
     43  }
     44 
     45  UniquePtr<uint8_t[]> fontData(new uint8_t[tableSize]);
     46 
     47  uint32_t sizeGot =
     48      ::GetFontData(dc.GetDC(), table, 0, fontData.get(), tableSize);
     49  if (sizeGot != tableSize) {
     50    return false;
     51  }
     52 
     53  aDataCallback(fontData.get(), tableSize, 0, aBaton);
     54  return true;
     55 }
     56 
     57 bool ScaledFontWin::GetFontInstanceData(FontInstanceDataOutput aCb,
     58                                        void* aBaton) {
     59  aCb(reinterpret_cast<uint8_t*>(&mLogFont), sizeof(mLogFont), nullptr, 0,
     60      aBaton);
     61  return true;
     62 }
     63 
     64 bool UnscaledFontGDI::GetFontInstanceData(FontInstanceDataOutput aCb,
     65                                          void* aBaton) {
     66  aCb(reinterpret_cast<uint8_t*>(&mLogFont), sizeof(mLogFont), aBaton);
     67  return true;
     68 }
     69 
     70 bool UnscaledFontGDI::GetFontDescriptor(FontDescriptorOutput aCb,
     71                                        void* aBaton) {
     72  // Because all the callers of this function are preparing a recorded
     73  // event to be played back in another process, it's not helpful to ever
     74  // return a font descriptor, since it isn't meaningful in another
     75  // process. Those callers will always need to send full font data, and
     76  // returning false here will ensure that that happens.
     77  return false;
     78 }
     79 
     80 already_AddRefed<UnscaledFont> UnscaledFontGDI::CreateFromFontDescriptor(
     81    const uint8_t* aData, uint32_t aDataLength, uint32_t aIndex) {
     82  if (aDataLength < sizeof(LOGFONT)) {
     83    gfxWarning() << "GDI font descriptor is truncated.";
     84    return nullptr;
     85  }
     86 
     87  const LOGFONT* logFont = reinterpret_cast<const LOGFONT*>(aData);
     88  RefPtr<UnscaledFont> unscaledFont = new UnscaledFontGDI(*logFont);
     89  return unscaledFont.forget();
     90 }
     91 
     92 already_AddRefed<ScaledFont> UnscaledFontGDI::CreateScaledFont(
     93    Float aGlyphSize, const uint8_t* aInstanceData,
     94    uint32_t aInstanceDataLength, const FontVariation* aVariations,
     95    uint32_t aNumVariations) {
     96  if (aInstanceDataLength < sizeof(LOGFONT)) {
     97    gfxWarning() << "GDI unscaled font instance data is truncated.";
     98    return nullptr;
     99  }
    100  return MakeAndAddRef<ScaledFontWin>(
    101      reinterpret_cast<const LOGFONT*>(aInstanceData), this, aGlyphSize);
    102 }
    103 
    104 AntialiasMode ScaledFontWin::GetDefaultAAMode() {
    105  return GetSystemDefaultAAMode();
    106 }
    107 
    108 SkTypeface* ScaledFontWin::CreateSkTypeface() {
    109  return SkCreateTypefaceFromLOGFONT(mLogFont).release();
    110 }
    111 
    112 cairo_font_face_t* ScaledFontWin::CreateCairoFontFace(
    113    cairo_font_options_t* aFontOptions) {
    114  if (mLogFont.lfFaceName[0] == 0) {
    115    return nullptr;
    116  }
    117  return cairo_win32_font_face_create_for_logfontw(&mLogFont);
    118 }
    119 
    120 }  // namespace gfx
    121 }  // namespace mozilla