gfx/2d/ScaledFontWin.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 "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