Home | History | Annotate | Download | only in ports 
      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 "SkLeanWindows.h"
     15 #include "SkTScopedComPtr.h"
     16 #include "SkTypeface.h"
     17 #include "SkTypefaceCache.h"
     18 
     19 #include <dwrite.h>
     20 #include <dwrite_1.h>
     21 #include <dwrite_2.h>
     22 
     23 class SkFontDescriptor;
     24 struct SkScalerContextRec;
     25 
     26 static SkFontStyle get_style(IDWriteFont* font) {
     27     int weight = font->GetWeight();
     28     int width = font->GetStretch();
     29     SkFontStyle::Slant slant = SkFontStyle::kUpright_Slant;
     30     switch (font->GetStyle()) {
     31         case DWRITE_FONT_STYLE_NORMAL: slant = SkFontStyle::kUpright_Slant; break;
     32         case DWRITE_FONT_STYLE_OBLIQUE: slant = SkFontStyle::kOblique_Slant; break;
     33         case DWRITE_FONT_STYLE_ITALIC: slant = SkFontStyle::kItalic_Slant; break;
     34         default: SkASSERT(false); break;
     35     }
     36     return SkFontStyle(weight, width, slant);
     37 }
     38 
     39 class DWriteFontTypeface : public SkTypeface {
     40 private:
     41     DWriteFontTypeface(const SkFontStyle& style,
     42                        IDWriteFactory* factory,
     43                        IDWriteFontFace* fontFace,
     44                        IDWriteFont* font,
     45                        IDWriteFontFamily* fontFamily,
     46                        IDWriteFontFileLoader* fontFileLoader = nullptr,
     47                        IDWriteFontCollectionLoader* fontCollectionLoader = nullptr)
     48         : SkTypeface(style, false)
     49         , fFactory(SkRefComPtr(factory))
     50         , fDWriteFontCollectionLoader(SkSafeRefComPtr(fontCollectionLoader))
     51         , fDWriteFontFileLoader(SkSafeRefComPtr(fontFileLoader))
     52         , fDWriteFontFamily(SkRefComPtr(fontFamily))
     53         , fDWriteFont(SkRefComPtr(font))
     54         , fDWriteFontFace(SkRefComPtr(fontFace))
     55     {
     56         if (!SUCCEEDED(fDWriteFontFace->QueryInterface(&fDWriteFontFace1))) {
     57             // IUnknown::QueryInterface states that if it fails, punk will be set to nullptr.
     58             // http://blogs.msdn.com/b/oldnewthing/archive/2004/03/26/96777.aspx
     59             SkASSERT_RELEASE(nullptr == fDWriteFontFace1.get());
     60         }
     61         if (!SUCCEEDED(fDWriteFontFace->QueryInterface(&fDWriteFontFace2))) {
     62             SkASSERT_RELEASE(nullptr == fDWriteFontFace2.get());
     63         }
     64         if (!SUCCEEDED(fFactory->QueryInterface(&fFactory2))) {
     65             SkASSERT_RELEASE(nullptr == fFactory2.get());
     66         }
     67     }
     68 
     69 public:
     70     SkTScopedComPtr<IDWriteFactory> fFactory;
     71     SkTScopedComPtr<IDWriteFactory2> fFactory2;
     72     SkTScopedComPtr<IDWriteFontCollectionLoader> fDWriteFontCollectionLoader;
     73     SkTScopedComPtr<IDWriteFontFileLoader> fDWriteFontFileLoader;
     74     SkTScopedComPtr<IDWriteFontFamily> fDWriteFontFamily;
     75     SkTScopedComPtr<IDWriteFont> fDWriteFont;
     76     SkTScopedComPtr<IDWriteFontFace> fDWriteFontFace;
     77     SkTScopedComPtr<IDWriteFontFace1> fDWriteFontFace1;
     78     SkTScopedComPtr<IDWriteFontFace2> fDWriteFontFace2;
     79 
     80     static DWriteFontTypeface* Create(IDWriteFactory* factory,
     81                                       IDWriteFontFace* fontFace,
     82                                       IDWriteFont* font,
     83                                       IDWriteFontFamily* fontFamily,
     84                                       IDWriteFontFileLoader* fontFileLoader = nullptr,
     85                                       IDWriteFontCollectionLoader* fontCollectionLoader = nullptr) {
     86         return new DWriteFontTypeface(get_style(font), factory, fontFace, font, fontFamily,
     87                                       fontFileLoader, fontCollectionLoader);
     88     }
     89 
     90 protected:
     91     void weak_dispose() const override {
     92         if (fDWriteFontCollectionLoader.get()) {
     93             HRV(fFactory->UnregisterFontCollectionLoader(fDWriteFontCollectionLoader.get()));
     94         }
     95         if (fDWriteFontFileLoader.get()) {
     96             HRV(fFactory->UnregisterFontFileLoader(fDWriteFontFileLoader.get()));
     97         }
     98 
     99         //SkTypefaceCache::Remove(this);
    100         INHERITED::weak_dispose();
    101     }
    102 
    103     SkStreamAsset* onOpenStream(int* ttcIndex) const override;
    104     SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
    105                                            const SkDescriptor*) const override;
    106     void onFilterRec(SkScalerContextRec*) const override;
    107     std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
    108     void onGetFontDescriptor(SkFontDescriptor*, bool*) const override;
    109     int onCharsToGlyphs(const void* chars, Encoding encoding,
    110                         uint16_t glyphs[], int glyphCount) const override;
    111     int onCountGlyphs() const override;
    112     int onGetUPEM() const override;
    113     void onGetFamilyName(SkString* familyName) const override;
    114     SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
    115     int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
    116                                      int coordinateCount) const override
    117     {
    118         return -1;
    119     }
    120     int onGetTableTags(SkFontTableTag tags[]) const override;
    121     size_t onGetTableData(SkFontTableTag, size_t offset, size_t length, void* data) const override;
    122 
    123 private:
    124     typedef SkTypeface INHERITED;
    125 };
    126 
    127 #endif
    128