src/third_party/skia/src/ports/SkTypeface_win_dw.h

   1 /*
   2  * Copyright 2014 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #ifndef SkTypeface_win_dw_DEFINED
   9 #define SkTypeface_win_dw_DEFINED
  10
  11 #include "SkAdvancedTypefaceMetrics.h"
  12 #include "SkDWrite.h"
  13 #include "SkHRESULT.h"
  14 #include "SkTScopedComPtr.h"
  15 #include "SkTypeface.h"
  16 #include "SkTypefaceCache.h"
  17 #include "SkTypes.h"
  18
  19 #include <dwrite.h>
  20 #include <dwrite_1.h>
  21
  22 class SkFontDescriptor;
  23 struct SkScalerContextRec;
  24
  25 static SkTypeface::Style get_style(IDWriteFont* font) {
  26     int style = SkTypeface::kNormal;
  27     DWRITE_FONT_WEIGHT weight = font->GetWeight();
  28     if (DWRITE_FONT_WEIGHT_DEMI_BOLD <= weight) {
  29         style |= SkTypeface::kBold;
  30     }
  31     DWRITE_FONT_STYLE angle = font->GetStyle();
  32     if (DWRITE_FONT_STYLE_OBLIQUE == angle || DWRITE_FONT_STYLE_ITALIC == angle) {
  33         style |= SkTypeface::kItalic;
  34     }
  35     return static_cast<SkTypeface::Style>(style);
  36 }
  37
  38 class DWriteFontTypeface : public SkTypeface {
  39 private:
  40     DWriteFontTypeface(SkTypeface::Style style, SkFontID fontID,
  41                        IDWriteFactory* factory,
  42                        IDWriteFontFace* fontFace,
  43                        IDWriteFont* font,
  44                        IDWriteFontFamily* fontFamily,
  45                        IDWriteFontFileLoader* fontFileLoader = NULL,
  46                        IDWriteFontCollectionLoader* fontCollectionLoader = NULL)
  47         : SkTypeface(style, fontID, false)
  48         , fFactory(SkRefComPtr(factory))
  49         , fDWriteFontCollectionLoader(SkSafeRefComPtr(fontCollectionLoader))
  50         , fDWriteFontFileLoader(SkSafeRefComPtr(fontFileLoader))
  51         , fDWriteFontFamily(SkRefComPtr(fontFamily))
  52         , fDWriteFont(SkRefComPtr(font))
  53         , fDWriteFontFace(SkRefComPtr(fontFace))
  54     {
  55         if (!SUCCEEDED(fDWriteFontFace->QueryInterface(&fDWriteFontFace1))) {
  56             // IUnknown::QueryInterface states that if it fails, punk will be set to NULL.
  57             // http://blogs.msdn.com/b/oldnewthing/archive/2004/03/26/96777.aspx
  58             SK_ALWAYSBREAK(NULL == fDWriteFontFace1.get());
  59         }
  60     }
  61
  62 public:
  63     SkTScopedComPtr<IDWriteFactory> fFactory;
  64     SkTScopedComPtr<IDWriteFontCollectionLoader> fDWriteFontCollectionLoader;
  65     SkTScopedComPtr<IDWriteFontFileLoader> fDWriteFontFileLoader;
  66     SkTScopedComPtr<IDWriteFontFamily> fDWriteFontFamily;
  67     SkTScopedComPtr<IDWriteFont> fDWriteFont;
  68     SkTScopedComPtr<IDWriteFontFace> fDWriteFontFace;
  69     SkTScopedComPtr<IDWriteFontFace1> fDWriteFontFace1;
  70
  71     static DWriteFontTypeface* Create(IDWriteFactory* factory,
  72                                       IDWriteFontFace* fontFace,
  73                                       IDWriteFont* font,
  74                                       IDWriteFontFamily* fontFamily,
  75                                       IDWriteFontFileLoader* fontFileLoader = NULL,
  76                                       IDWriteFontCollectionLoader* fontCollectionLoader = NULL) {
  77         SkTypeface::Style style = get_style(font);
  78         SkFontID fontID = SkTypefaceCache::NewFontID();
  79         return SkNEW_ARGS(DWriteFontTypeface, (style, fontID,
  80                                                factory, fontFace, font, fontFamily,
  81                                                fontFileLoader, fontCollectionLoader));
  82     }
  83
  84 protected:
  85     virtual void weak_dispose() const SK_OVERRIDE {
  86         if (fDWriteFontCollectionLoader.get()) {
  87             HRV(fFactory->UnregisterFontCollectionLoader(fDWriteFontCollectionLoader.get()));
  88         }
  89         if (fDWriteFontFileLoader.get()) {
  90             HRV(fFactory->UnregisterFontFileLoader(fDWriteFontFileLoader.get()));
  91         }
  92
  93         //SkTypefaceCache::Remove(this);
  94         INHERITED::weak_dispose();
  95     }
  96
  97     virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE;
  98     virtual SkScalerContext* onCreateScalerContext(const SkDescriptor*) const SK_OVERRIDE;
  99     virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE;
 100     virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
 101                                 SkAdvancedTypefaceMetrics::PerGlyphInfo,
 102                                 const uint32_t*, uint32_t) const SK_OVERRIDE;
 103     virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE;
 104     virtual int onCharsToGlyphs(const void* chars, Encoding encoding,
 105                                 uint16_t glyphs[], int glyphCount) const SK_OVERRIDE;
 106     virtual int onCountGlyphs() const SK_OVERRIDE;
 107     virtual int onGetUPEM() const SK_OVERRIDE;
 108     virtual SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const SK_OVERRIDE;
 109     virtual int onGetTableTags(SkFontTableTag tags[]) const SK_OVERRIDE;
 110     virtual size_t onGetTableData(SkFontTableTag, size_t offset,
 111                                   size_t length, void* data) const SK_OVERRIDE;
 112
 113 private:
 114     typedef SkTypeface INHERITED;
 115 };
 116
 117 #endif