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Add an empty typeface as a default-default.

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R=reed@google.com

Review URL: https://codereview.chromium.org/22861017

git-svn-id: http://skia.googlecode.com/svn/trunk@10857 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
bungeman@google.com 2013-08-21 17:20:57 +00:00
parent ab17a4fa1f
commit 5c1d88dca0
1 changed files with 34 additions and 2 deletions
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36
src/core/SkTypeface.cpp
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@ -36,6 +36,35 @@ SkTypeface::~SkTypeface() {
///////////////////////////////////////////////////////////////////////////////
class SkEmptyTypeface : public SkTypeface {
public:
SkEmptyTypeface() : SkTypeface(SkTypeface::kNormal, 0, true) { }
protected:
virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE { return NULL; }
virtual SkScalerContext* onCreateScalerContext(const SkDescriptor*) const SK_OVERRIDE {
return NULL;
}
virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE { }
virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
SkAdvancedTypefaceMetrics::PerGlyphInfo,
const uint32_t*, uint32_t) const SK_OVERRIDE { return NULL; }
virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE { }
virtual int onCountGlyphs() const SK_OVERRIDE { return 0; };
virtual int onGetUPEM() const SK_OVERRIDE { return 0; };
class EmptyLocalizedStrings : public SkTypeface::LocalizedStrings {
public:
virtual bool next(SkTypeface::LocalizedString*) SK_OVERRIDE { return false; }
};
virtual SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const SK_OVERRIDE {
return SkNEW(EmptyLocalizedStrings);
};
virtual int onGetTableTags(SkFontTableTag tags[]) const SK_OVERRIDE { return 0; }
virtual size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const SK_OVERRIDE {
return 0;
}
virtual SkTypeface* onRefMatchingStyle(Style) const SK_OVERRIDE { return NULL; }
};
SkTypeface* SkTypeface::GetDefaultTypeface(Style style) {
// we keep a reference to this guy for all time, since if we return its
// fontID, the font cache may later on ask to resolve that back into a
@ -48,9 +77,12 @@ SkTypeface* SkTypeface::GetDefaultTypeface(Style style) {
style = (Style)(style & 0x03);
if (NULL == gDefaultTypefaces[style]) {
gDefaultTypefaces[style] =
SkFontHost::CreateTypeface(NULL, NULL, style);
gDefaultTypefaces[style] = SkFontHost::CreateTypeface(NULL, NULL, style);
}
if (NULL == gDefaultTypefaces[style]) {
gDefaultTypefaces[style] = SkNEW(SkEmptyTypeface);
}
return gDefaultTypefaces[style];
}