1 /*
2  * Copyright 2018 The Android Open Source Project
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 SkTestEmptyTypeface_DEFINED
9 #define SkTestEmptyTypeface_DEFINED
10 
11 #include "SkTypeface.h"
12 
13 class SkTestEmptyTypeface : public SkTypeface {
14 public:
Make()15     static sk_sp<SkTypeface> Make() { return sk_sp<SkTypeface>(new SkTestEmptyTypeface); }
16 protected:
SkTestEmptyTypeface()17     SkTestEmptyTypeface() : SkTypeface(SkFontStyle(), true) { }
18 
onOpenStream(int * ttcIndex)19     std::unique_ptr<SkStreamAsset> onOpenStream(int* ttcIndex) const override { return nullptr; }
onMakeClone(const SkFontArguments & args)20     sk_sp<SkTypeface> onMakeClone(const SkFontArguments& args) const override {
21         return sk_ref_sp(this);
22     }
onCreateScalerContext(const SkScalerContextEffects &,const SkDescriptor *)23     SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
24                                            const SkDescriptor*) const override {
25         return nullptr;
26     }
onFilterRec(SkScalerContextRec *)27     void onFilterRec(SkScalerContextRec*) const override { }
onGetAdvancedMetrics()28     std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override {
29         return nullptr;
30     }
onGetFontDescriptor(SkFontDescriptor *,bool *)31     void onGetFontDescriptor(SkFontDescriptor*, bool*) const override { }
onCharsToGlyphs(const void * chars,Encoding encoding,uint16_t glyphs[],int glyphCount)32     virtual int onCharsToGlyphs(const void* chars, Encoding encoding,
33                                 uint16_t glyphs[], int glyphCount) const override {
34         if (glyphs && glyphCount > 0) {
35             sk_bzero(glyphs, glyphCount * sizeof(glyphs[0]));
36         }
37         return 0;
38     }
onCountGlyphs()39     int onCountGlyphs() const override { return 0; }
onGetUPEM()40     int onGetUPEM() const override { return 0; }
41     class EmptyLocalizedStrings : public SkTypeface::LocalizedStrings {
42     public:
next(SkTypeface::LocalizedString *)43         bool next(SkTypeface::LocalizedString*) override { return false; }
44     };
onGetFamilyName(SkString * familyName)45     void onGetFamilyName(SkString* familyName) const override {
46         familyName->reset();
47     }
onCreateFamilyNameIterator()48     SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override {
49         return new EmptyLocalizedStrings;
50     }
onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],int coordinateCount)51     int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
52                                      int coordinateCount) const override
53     {
54         return 0;
55     }
onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],int parameterCount)56     int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],
57                                        int parameterCount) const override
58     {
59         return 0;
60     }
onGetTableTags(SkFontTableTag tags[])61     int onGetTableTags(SkFontTableTag tags[]) const override { return 0; }
onGetTableData(SkFontTableTag,size_t,size_t,void *)62     size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const override {
63         return 0;
64     }
65 };
66 
67 
68 #endif  // SkTestEmptyTypeface_DEFINED
69