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#if SK_HAS_DWRITE_1_H
21#  include <dwrite_1.h>
22#endif
23
24class SkFontDescriptor;
25struct SkScalerContextRec;
26
27static SkTypeface::Style get_style(IDWriteFont* font) {
28    int style = SkTypeface::kNormal;
29    DWRITE_FONT_WEIGHT weight = font->GetWeight();
30    if (DWRITE_FONT_WEIGHT_DEMI_BOLD <= weight) {
31        style |= SkTypeface::kBold;
32    }
33    DWRITE_FONT_STYLE angle = font->GetStyle();
34    if (DWRITE_FONT_STYLE_OBLIQUE == angle || DWRITE_FONT_STYLE_ITALIC == angle) {
35        style |= SkTypeface::kItalic;
36    }
37    return static_cast<SkTypeface::Style>(style);
38}
39
40class DWriteFontTypeface : public SkTypeface {
41private:
42    DWriteFontTypeface(SkTypeface::Style style, SkFontID fontID,
43                       IDWriteFactory* factory,
44                       IDWriteFontFace* fontFace,
45                       IDWriteFont* font,
46                       IDWriteFontFamily* fontFamily,
47                       IDWriteFontFileLoader* fontFileLoader = NULL,
48                       IDWriteFontCollectionLoader* fontCollectionLoader = NULL)
49        : SkTypeface(style, fontID, false)
50        , fFactory(SkRefComPtr(factory))
51        , fDWriteFontCollectionLoader(SkSafeRefComPtr(fontCollectionLoader))
52        , fDWriteFontFileLoader(SkSafeRefComPtr(fontFileLoader))
53        , fDWriteFontFamily(SkRefComPtr(fontFamily))
54        , fDWriteFont(SkRefComPtr(font))
55        , fDWriteFontFace(SkRefComPtr(fontFace))
56    {
57#if SK_HAS_DWRITE_1_H
58        if (!SUCCEEDED(fDWriteFontFace->QueryInterface(&fDWriteFontFace1))) {
59            // IUnknown::QueryInterface states that if it fails, punk will be set to NULL.
60            // http://blogs.msdn.com/b/oldnewthing/archive/2004/03/26/96777.aspx
61            SK_ALWAYSBREAK(NULL == fDWriteFontFace1.get());
62        }
63#endif
64    }
65
66public:
67    SkTScopedComPtr<IDWriteFactory> fFactory;
68    SkTScopedComPtr<IDWriteFontCollectionLoader> fDWriteFontCollectionLoader;
69    SkTScopedComPtr<IDWriteFontFileLoader> fDWriteFontFileLoader;
70    SkTScopedComPtr<IDWriteFontFamily> fDWriteFontFamily;
71    SkTScopedComPtr<IDWriteFont> fDWriteFont;
72    SkTScopedComPtr<IDWriteFontFace> fDWriteFontFace;
73#if SK_HAS_DWRITE_1_H
74    SkTScopedComPtr<IDWriteFontFace1> fDWriteFontFace1;
75#endif
76
77    static DWriteFontTypeface* Create(IDWriteFactory* factory,
78                                      IDWriteFontFace* fontFace,
79                                      IDWriteFont* font,
80                                      IDWriteFontFamily* fontFamily,
81                                      IDWriteFontFileLoader* fontFileLoader = NULL,
82                                      IDWriteFontCollectionLoader* fontCollectionLoader = NULL) {
83        SkTypeface::Style style = get_style(font);
84        SkFontID fontID = SkTypefaceCache::NewFontID();
85        return SkNEW_ARGS(DWriteFontTypeface, (style, fontID,
86                                               factory, fontFace, font, fontFamily,
87                                               fontFileLoader, fontCollectionLoader));
88    }
89
90protected:
91    virtual void weak_dispose() const SK_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    virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE;
104    virtual SkScalerContext* onCreateScalerContext(const SkDescriptor*) const SK_OVERRIDE;
105    virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE;
106    virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
107                                SkAdvancedTypefaceMetrics::PerGlyphInfo,
108                                const uint32_t*, uint32_t) const SK_OVERRIDE;
109    virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE;
110    virtual int onCharsToGlyphs(const void* chars, Encoding encoding,
111                                uint16_t glyphs[], int glyphCount) const SK_OVERRIDE;
112    virtual int onCountGlyphs() const SK_OVERRIDE;
113    virtual int onGetUPEM() const SK_OVERRIDE;
114    virtual void onGetFamilyName(SkString* familyName) const SK_OVERRIDE;
115    virtual SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const SK_OVERRIDE;
116    virtual int onGetTableTags(SkFontTableTag tags[]) const SK_OVERRIDE;
117    virtual size_t onGetTableData(SkFontTableTag, size_t offset,
118                                  size_t length, void* data) const SK_OVERRIDE;
119
120private:
121    typedef SkTypeface INHERITED;
122};
123
124#endif
125