SkTypeface* SkFontMgr_DirectWrite::onMatchFamilyStyleCharacter(const char familyName[],
const SkFontStyle& style,
const char* bcp47[], int bcp47Count,
SkUnichar character) const
{
const DWriteStyle dwStyle(style);
const WCHAR* dwFamilyName = NULL;
SkSMallocWCHAR dwFamilyNameLocal;
if (familyName) {
HRN(sk_cstring_to_wchar(familyName, &dwFamilyNameLocal));
dwFamilyName = dwFamilyNameLocal;
}
WCHAR str[16];
UINT32 strLen = static_cast<UINT32>(
SkUTF16_FromUnichar(character, reinterpret_cast<uint16_t*>(str)));
const SkSMallocWCHAR* dwBcp47;
SkSMallocWCHAR dwBcp47Local;
if (bcp47Count < 1) {
dwBcp47 = &fLocaleName;
} else {
// TODO: support fallback stack.
// TODO: DirectWrite supports 'zh-CN' or 'zh-Hans', but 'zh' misses completely
// and may produce a Japanese font.
HRN(sk_cstring_to_wchar(bcp47[bcp47Count - 1], &dwBcp47Local));
dwBcp47 = &dwBcp47Local;
}
#if SK_HAS_DWRITE_2_H
if (fFactory2.get()) {
SkTScopedComPtr<IDWriteFontFallback> fontFallback;
HRNM(fFactory2->GetSystemFontFallback(&fontFallback), "Could not get system fallback.");
SkTScopedComPtr<IDWriteNumberSubstitution> numberSubstitution;
HRNM(fFactory2->CreateNumberSubstitution(DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE, NULL, TRUE,
&numberSubstitution),
"Could not create number substitution.");
SkTScopedComPtr<FontFallbackSource> fontFallbackSource(
new FontFallbackSource(str, strLen, *dwBcp47, numberSubstitution.get()));
UINT32 mappedLength;
SkTScopedComPtr<IDWriteFont> font;
FLOAT scale;
HRNM(fontFallback->MapCharacters(fontFallbackSource.get(),
0, // textPosition,
strLen,
fFontCollection.get(),
dwFamilyName,
dwStyle.fWeight,
dwStyle.fSlant,
dwStyle.fWidth,
&mappedLength,
&font,
&scale),
"Could not map characters");
if (!font.get()) {
return NULL;
}
SkTScopedComPtr<IDWriteFontFace> fontFace;
HRNM(font->CreateFontFace(&fontFace), "Could not get font face from font.");
SkTScopedComPtr<IDWriteFontFamily> fontFamily;
HRNM(font->GetFontFamily(&fontFamily), "Could not get family from font.");
return this->createTypefaceFromDWriteFont(fontFace.get(), font.get(), fontFamily.get());
}
#else
# pragma message("No dwrite_2.h is available, font fallback may be affected.")
#endif
SkTScopedComPtr<IDWriteTextFormat> fallbackFormat;
HRNM(fFactory->CreateTextFormat(dwFamilyName ? dwFamilyName : L"",
fFontCollection.get(),
dwStyle.fWeight,
dwStyle.fSlant,
dwStyle.fWidth,
72.0f,
*dwBcp47,
&fallbackFormat),
"Could not create text format.");
SkTScopedComPtr<IDWriteTextLayout> fallbackLayout;
HRNM(fFactory->CreateTextLayout(str, strLen, fallbackFormat.get(),
200.0f, 200.0f,
&fallbackLayout),
"Could not create text layout.");
SkTScopedComPtr<FontFallbackRenderer> fontFallbackRenderer(
new FontFallbackRenderer(this, character));
HRNM(fallbackLayout->Draw(NULL, fontFallbackRenderer.get(), 50.0f, 50.0f),
"Could not draw layout with renderer.");
return fontFallbackRenderer->FallbackTypeface();
}
