SkTestScalerContext.h revision 97043299cb352f50f604878b7a1dc8ad127fc1c6 
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 SkTestScalerContext_DEFINED
9#define SkTestScalerContext_DEFINED
10
11#include "SkFixed.h"
12#include "SkPaint.h"
13#include "SkPath.h"
14#include "SkRefCnt.h"
15#include "SkTDArray.h"
16#include "SkTypeface.h"
17
18class SkTestFont;
19
20struct SkTestFontData {
21    const SkScalar* fPoints;
22    const unsigned char* fVerbs;
23    const unsigned* fCharCodes;
24    const size_t fCharCodesCount;
25    const SkFixed* fWidths;
26    const SkPaint::FontMetrics& fMetrics;
27    const char* fName;
28    SkTypeface::Style fStyle;
29    sk_sp<SkTestFont> fCachedFont;
30};
31
32class SkTestFont : public SkRefCnt {
33public:
34    SkTestFont(const SkTestFontData& );
35    virtual ~SkTestFont();
36    int codeToIndex(SkUnichar charCode) const;
37    void init(const SkScalar* pts, const unsigned char* verbs);
38#ifdef SK_DEBUG  // detect missing test font data
39    mutable unsigned char fDebugBits[16];
40    mutable SkUnichar fDebugOverage[8];
41    const char* fDebugName;
42    SkFontStyle fDebugStyle;
43    const char* debugFontName() const { return fName; }
44#endif
45private:
46    const unsigned* fCharCodes;
47    const size_t fCharCodesCount;
48    const SkFixed* fWidths;
49    const SkPaint::FontMetrics& fMetrics;
50    const char* fName;
51    SkPath** fPaths;
52    friend class SkTestTypeface;
53    typedef SkRefCnt INHERITED;
54};
55
56
57class SkTestTypeface : public SkTypeface {
58public:
59    SkTestTypeface(sk_sp<SkTestFont>, const SkFontStyle& style);
60    void getAdvance(SkGlyph* glyph);
61    void getFontMetrics(SkPaint::FontMetrics* metrics);
62    void getMetrics(SkGlyph* glyph);
63    void getPath(SkGlyphID glyph, SkPath* path);
64protected:
65    SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
66                                           const SkDescriptor* desc) const override;
67    void onFilterRec(SkScalerContextRec* rec) const override;
68    SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
69        PerGlyphInfo,
70        const uint32_t* glyphIDs,
71        uint32_t glyphIDsCount) const override;
72
73    SkStreamAsset* onOpenStream(int* ttcIndex) const override {
74        return nullptr;
75    }
76
77    void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const override;
78
79    int onCharsToGlyphs(const void* chars, Encoding encoding,
80                        uint16_t glyphs[], int glyphCount) const override;
81
82    int onCountGlyphs() const override {
83        return (int) fTestFont->fCharCodesCount;
84    }
85
86    int onGetUPEM() const override {
87        SkASSERT(0);  // don't expect to get here
88        return 1;
89    }
90
91    void onGetFamilyName(SkString* familyName) const override;
92    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
93
94    int onGetTableTags(SkFontTableTag tags[]) const override {
95        return 0;
96    }
97
98    size_t onGetTableData(SkFontTableTag tag, size_t offset,
99                          size_t length, void* data) const override {
100        return 0;
101    }
102private:
103    sk_sp<SkTestFont> fTestFont;
104    friend class SkTestScalerContext;
105};
106
107SkTypeface* CreateTestTypeface(const char* name, SkTypeface::Style style);
108
109#endif
110