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1 /*
2  * Copyright 2015 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 RandomScalerContext_DEFINED
9 #define RandomScalerContext_DEFINED
10 
11 #include "include/core/SkTypeface.h"
12 #include "src/core/SkScalerContext.h"
13 
14 /*
15  * This scaler context is for debug only purposes.  It will 'randomly' but deterministically return
16  * LCD / A8 / BW / RBGA masks based off of the Glyph ID
17  */
18 
19 class SkRandomTypeface : public SkTypeface {
20 public:
21     SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint&, bool fakeit);
22 
proxy()23     SkTypeface*    proxy() const { return fProxy.get(); }
paint()24     const SkPaint& paint() const { return fPaint; }
25 
26 protected:
27     SkScalerContext*                           onCreateScalerContext(const SkScalerContextEffects&,
28                                                                      const SkDescriptor*) const override;
29     void                                       onFilterRec(SkScalerContextRec*) const override;
30     void                                       getGlyphToUnicodeMap(SkUnichar*) const override;
31     std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
32     std::unique_ptr<SkStreamAsset>             onOpenStream(int* ttcIndex) const override;
33     sk_sp<SkTypeface> onMakeClone(const SkFontArguments& args) const override;
34     void              onGetFontDescriptor(SkFontDescriptor*, bool* isLocal) const override;
35 
36     void onCharsToGlyphs(const SkUnichar* chars, int count, SkGlyphID glyphs[]) const override;
37     int onCountGlyphs() const override;
38     int onGetUPEM() const override;
39 
40     void                          onGetFamilyName(SkString* familyName) const override;
41     SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
42 
43     void getPostScriptGlyphNames(SkString*) const override;
44 
45     int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
46                                      int coordinateCount) const override;
47     int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],
48                                        int parameterCount) const override;
49     int onGetTableTags(SkFontTableTag tags[]) const override;
50     size_t onGetTableData(SkFontTableTag, size_t offset, size_t length, void* data) const override;
51 
52 private:
53     sk_sp<SkTypeface> fProxy;
54     SkPaint           fPaint;
55     bool              fFakeIt;
56 };
57 
58 #endif
59