| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkDWriteFontFileStream.h" |
| #include "SkFontDescriptor.h" |
| #include "SkFontStream.h" |
| #include "SkOTTable_head.h" |
| #include "SkOTTable_hhea.h" |
| #include "SkOTTable_OS_2.h" |
| #include "SkOTTable_post.h" |
| #include "SkScalerContext.h" |
| #include "SkScalerContext_win_dw.h" |
| #include "SkTypeface_win_dw.h" |
| #include "SkTypes.h" |
| #include "SkUtils.h" |
| |
| void DWriteFontTypeface::onGetFontDescriptor(SkFontDescriptor* desc, |
| bool* isLocalStream) const { |
| // Get the family name. |
| SkTScopedComPtr<IDWriteLocalizedStrings> dwFamilyNames; |
| HRV(fDWriteFontFamily->GetFamilyNames(&dwFamilyNames)); |
| |
| UINT32 dwFamilyNamesLength; |
| HRV(dwFamilyNames->GetStringLength(0, &dwFamilyNamesLength)); |
| |
| SkSMallocWCHAR dwFamilyNameChar(dwFamilyNamesLength+1); |
| HRV(dwFamilyNames->GetString(0, dwFamilyNameChar.get(), dwFamilyNamesLength+1)); |
| |
| SkString utf8FamilyName; |
| HRV(sk_wchar_to_skstring(dwFamilyNameChar.get(), &utf8FamilyName)); |
| |
| desc->setFamilyName(utf8FamilyName.c_str()); |
| *isLocalStream = SkToBool(fDWriteFontFileLoader.get()); |
| } |
| |
| static SkUnichar next_utf8(const void** chars) { |
| return SkUTF8_NextUnichar((const char**)chars); |
| } |
| |
| static SkUnichar next_utf16(const void** chars) { |
| return SkUTF16_NextUnichar((const uint16_t**)chars); |
| } |
| |
| static SkUnichar next_utf32(const void** chars) { |
| const SkUnichar** uniChars = (const SkUnichar**)chars; |
| SkUnichar uni = **uniChars; |
| *uniChars += 1; |
| return uni; |
| } |
| |
| typedef SkUnichar (*EncodingProc)(const void**); |
| |
| static EncodingProc find_encoding_proc(SkTypeface::Encoding enc) { |
| static const EncodingProc gProcs[] = { |
| next_utf8, next_utf16, next_utf32 |
| }; |
| SkASSERT((size_t)enc < SK_ARRAY_COUNT(gProcs)); |
| return gProcs[enc]; |
| } |
| |
| int DWriteFontTypeface::onCharsToGlyphs(const void* chars, Encoding encoding, |
| uint16_t glyphs[], int glyphCount) const |
| { |
| if (NULL == glyphs) { |
| EncodingProc next_ucs4_proc = find_encoding_proc(encoding); |
| for (int i = 0; i < glyphCount; ++i) { |
| const SkUnichar c = next_ucs4_proc(&chars); |
| BOOL exists; |
| fDWriteFont->HasCharacter(c, &exists); |
| if (!exists) { |
| return i; |
| } |
| } |
| return glyphCount; |
| } |
| |
| switch (encoding) { |
| case SkTypeface::kUTF8_Encoding: |
| case SkTypeface::kUTF16_Encoding: { |
| static const int scratchCount = 256; |
| UINT32 scratch[scratchCount]; |
| EncodingProc next_ucs4_proc = find_encoding_proc(encoding); |
| for (int baseGlyph = 0; baseGlyph < glyphCount; baseGlyph += scratchCount) { |
| int glyphsLeft = glyphCount - baseGlyph; |
| int limit = SkTMin(glyphsLeft, scratchCount); |
| for (int i = 0; i < limit; ++i) { |
| scratch[i] = next_ucs4_proc(&chars); |
| } |
| fDWriteFontFace->GetGlyphIndices(scratch, limit, &glyphs[baseGlyph]); |
| } |
| break; |
| } |
| case SkTypeface::kUTF32_Encoding: { |
| const UINT32* utf32 = reinterpret_cast<const UINT32*>(chars); |
| fDWriteFontFace->GetGlyphIndices(utf32, glyphCount, glyphs); |
| break; |
| } |
| default: |
| SK_CRASH(); |
| } |
| |
| for (int i = 0; i < glyphCount; ++i) { |
| if (0 == glyphs[i]) { |
| return i; |
| } |
| } |
| return glyphCount; |
| } |
| |
| int DWriteFontTypeface::onCountGlyphs() const { |
| return fDWriteFontFace->GetGlyphCount(); |
| } |
| |
| int DWriteFontTypeface::onGetUPEM() const { |
| DWRITE_FONT_METRICS metrics; |
| fDWriteFontFace->GetMetrics(&metrics); |
| return metrics.designUnitsPerEm; |
| } |
| |
| class LocalizedStrings_IDWriteLocalizedStrings : public SkTypeface::LocalizedStrings { |
| public: |
| /** Takes ownership of the IDWriteLocalizedStrings. */ |
| explicit LocalizedStrings_IDWriteLocalizedStrings(IDWriteLocalizedStrings* strings) |
| : fIndex(0), fStrings(strings) |
| { } |
| |
| virtual bool next(SkTypeface::LocalizedString* localizedString) SK_OVERRIDE { |
| if (fIndex >= fStrings->GetCount()) { |
| return false; |
| } |
| |
| // String |
| UINT32 stringLength; |
| HRBM(fStrings->GetStringLength(fIndex, &stringLength), "Could not get string length."); |
| stringLength += 1; |
| |
| SkSMallocWCHAR wString(stringLength); |
| HRBM(fStrings->GetString(fIndex, wString.get(), stringLength), "Could not get string."); |
| |
| HRB(sk_wchar_to_skstring(wString.get(), &localizedString->fString)); |
| |
| // Locale |
| UINT32 localeLength; |
| HRBM(fStrings->GetLocaleNameLength(fIndex, &localeLength), "Could not get locale length."); |
| localeLength += 1; |
| |
| SkSMallocWCHAR wLocale(localeLength); |
| HRBM(fStrings->GetLocaleName(fIndex, wLocale.get(), localeLength), "Could not get locale."); |
| |
| HRB(sk_wchar_to_skstring(wLocale.get(), &localizedString->fLanguage)); |
| |
| ++fIndex; |
| return true; |
| } |
| |
| private: |
| UINT32 fIndex; |
| SkTScopedComPtr<IDWriteLocalizedStrings> fStrings; |
| }; |
| |
| SkTypeface::LocalizedStrings* DWriteFontTypeface::onCreateFamilyNameIterator() const { |
| SkTScopedComPtr<IDWriteLocalizedStrings> familyNames; |
| HRNM(fDWriteFontFamily->GetFamilyNames(&familyNames), "Could not obtain family names."); |
| |
| return new LocalizedStrings_IDWriteLocalizedStrings(familyNames.release()); |
| } |
| |
| int DWriteFontTypeface::onGetTableTags(SkFontTableTag tags[]) const { |
| DWRITE_FONT_FACE_TYPE type = fDWriteFontFace->GetType(); |
| if (type != DWRITE_FONT_FACE_TYPE_CFF && |
| type != DWRITE_FONT_FACE_TYPE_TRUETYPE && |
| type != DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION) |
| { |
| return 0; |
| } |
| |
| int ttcIndex; |
| SkAutoTUnref<SkStream> stream(this->openStream(&ttcIndex)); |
| return stream.get() ? SkFontStream::GetTableTags(stream, ttcIndex, tags) : 0; |
| } |
| |
| size_t DWriteFontTypeface::onGetTableData(SkFontTableTag tag, size_t offset, |
| size_t length, void* data) const |
| { |
| AutoDWriteTable table(fDWriteFontFace.get(), SkEndian_SwapBE32(tag)); |
| if (!table.fExists) { |
| return 0; |
| } |
| |
| if (offset > table.fSize) { |
| return 0; |
| } |
| size_t size = SkTMin(length, table.fSize - offset); |
| if (NULL != data) { |
| memcpy(data, table.fData + offset, size); |
| } |
| |
| return size; |
| } |
| |
| SkStream* DWriteFontTypeface::onOpenStream(int* ttcIndex) const { |
| *ttcIndex = fDWriteFontFace->GetIndex(); |
| |
| UINT32 numFiles; |
| HRNM(fDWriteFontFace->GetFiles(&numFiles, NULL), |
| "Could not get number of font files."); |
| if (numFiles != 1) { |
| return NULL; |
| } |
| |
| SkTScopedComPtr<IDWriteFontFile> fontFile; |
| HRNM(fDWriteFontFace->GetFiles(&numFiles, &fontFile), "Could not get font files."); |
| |
| const void* fontFileKey; |
| UINT32 fontFileKeySize; |
| HRNM(fontFile->GetReferenceKey(&fontFileKey, &fontFileKeySize), |
| "Could not get font file reference key."); |
| |
| SkTScopedComPtr<IDWriteFontFileLoader> fontFileLoader; |
| HRNM(fontFile->GetLoader(&fontFileLoader), "Could not get font file loader."); |
| |
| SkTScopedComPtr<IDWriteFontFileStream> fontFileStream; |
| HRNM(fontFileLoader->CreateStreamFromKey(fontFileKey, fontFileKeySize, |
| &fontFileStream), |
| "Could not create font file stream."); |
| |
| return SkNEW_ARGS(SkDWriteFontFileStream, (fontFileStream.get())); |
| } |
| |
| SkScalerContext* DWriteFontTypeface::onCreateScalerContext(const SkDescriptor* desc) const { |
| return SkNEW_ARGS(SkScalerContext_DW, (const_cast<DWriteFontTypeface*>(this), desc)); |
| } |
| |
| void DWriteFontTypeface::onFilterRec(SkScalerContext::Rec* rec) const { |
| if (rec->fFlags & SkScalerContext::kLCD_BGROrder_Flag || |
| rec->fFlags & SkScalerContext::kLCD_Vertical_Flag) |
| { |
| rec->fMaskFormat = SkMask::kA8_Format; |
| } |
| |
| unsigned flagsWeDontSupport = SkScalerContext::kVertical_Flag | |
| SkScalerContext::kDevKernText_Flag | |
| SkScalerContext::kForceAutohinting_Flag | |
| SkScalerContext::kEmbolden_Flag | |
| SkScalerContext::kLCD_BGROrder_Flag | |
| SkScalerContext::kLCD_Vertical_Flag; |
| rec->fFlags &= ~flagsWeDontSupport; |
| |
| SkPaint::Hinting h = rec->getHinting(); |
| // DirectWrite does not provide for hinting hints. |
| h = SkPaint::kSlight_Hinting; |
| rec->setHinting(h); |
| |
| #if SK_FONT_HOST_USE_SYSTEM_SETTINGS |
| IDWriteFactory* factory = get_dwrite_factory(); |
| if (factory != NULL) { |
| SkTScopedComPtr<IDWriteRenderingParams> defaultRenderingParams; |
| if (SUCCEEDED(factory->CreateRenderingParams(&defaultRenderingParams))) { |
| float gamma = defaultRenderingParams->GetGamma(); |
| rec->setDeviceGamma(gamma); |
| rec->setPaintGamma(gamma); |
| |
| rec->setContrast(defaultRenderingParams->GetEnhancedContrast()); |
| } |
| } |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| //PDF Support |
| |
| using namespace skia_advanced_typeface_metrics_utils; |
| |
| // Construct Glyph to Unicode table. |
| // Unicode code points that require conjugate pairs in utf16 are not |
| // supported. |
| // TODO(arthurhsu): Add support for conjugate pairs. It looks like that may |
| // require parsing the TTF cmap table (platform 4, encoding 12) directly instead |
| // of calling GetFontUnicodeRange(). |
| // TODO(bungeman): This never does what anyone wants. |
| // What is really wanted is the text to glyphs mapping |
| static void populate_glyph_to_unicode(IDWriteFontFace* fontFace, |
| const unsigned glyphCount, |
| SkTDArray<SkUnichar>* glyphToUnicode) { |
| HRESULT hr = S_OK; |
| |
| //Do this like free type instead |
| UINT32 count = 0; |
| for (UINT32 c = 0; c < 0x10FFFF; ++c) { |
| UINT16 glyph; |
| hr = fontFace->GetGlyphIndices(&c, 1, &glyph); |
| if (glyph > 0) { |
| ++count; |
| } |
| } |
| |
| SkAutoTArray<UINT32> chars(count); |
| count = 0; |
| for (UINT32 c = 0; c < 0x10FFFF; ++c) { |
| UINT16 glyph; |
| hr = fontFace->GetGlyphIndices(&c, 1, &glyph); |
| if (glyph > 0) { |
| chars[count] = c; |
| ++count; |
| } |
| } |
| |
| SkAutoTArray<UINT16> glyph(count); |
| fontFace->GetGlyphIndices(chars.get(), count, glyph.get()); |
| |
| USHORT maxGlyph = 0; |
| for (USHORT j = 0; j < count; ++j) { |
| if (glyph[j] > maxGlyph) maxGlyph = glyph[j]; |
| } |
| |
| glyphToUnicode->setCount(maxGlyph+1); |
| for (USHORT j = 0; j < maxGlyph+1u; ++j) { |
| (*glyphToUnicode)[j] = 0; |
| } |
| |
| //'invert' |
| for (USHORT j = 0; j < count; ++j) { |
| if (glyph[j] < glyphCount && (*glyphToUnicode)[glyph[j]] == 0) { |
| (*glyphToUnicode)[glyph[j]] = chars[j]; |
| } |
| } |
| } |
| |
| static bool getWidthAdvance(IDWriteFontFace* fontFace, int gId, int16_t* advance) { |
| SkASSERT(advance); |
| |
| UINT16 glyphId = gId; |
| DWRITE_GLYPH_METRICS gm; |
| HRESULT hr = fontFace->GetDesignGlyphMetrics(&glyphId, 1, &gm); |
| |
| if (FAILED(hr)) { |
| *advance = 0; |
| return false; |
| } |
| |
| *advance = gm.advanceWidth; |
| return true; |
| } |
| |
| SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics( |
| SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo, |
| const uint32_t* glyphIDs, |
| uint32_t glyphIDsCount) const { |
| |
| SkAdvancedTypefaceMetrics* info = NULL; |
| |
| HRESULT hr = S_OK; |
| |
| const unsigned glyphCount = fDWriteFontFace->GetGlyphCount(); |
| |
| DWRITE_FONT_METRICS dwfm; |
| fDWriteFontFace->GetMetrics(&dwfm); |
| |
| info = new SkAdvancedTypefaceMetrics; |
| info->fEmSize = dwfm.designUnitsPerEm; |
| info->fLastGlyphID = SkToU16(glyphCount - 1); |
| info->fStyle = 0; |
| info->fFlags = SkAdvancedTypefaceMetrics::kEmpty_FontFlag; |
| |
| // SkAdvancedTypefaceMetrics::fFontName is in theory supposed to be |
| // the PostScript name of the font. However, due to the way it is currently |
| // used, it must actually be a family name. |
| SkTScopedComPtr<IDWriteLocalizedStrings> familyNames; |
| hr = fDWriteFontFamily->GetFamilyNames(&familyNames); |
| |
| UINT32 familyNameLength; |
| hr = familyNames->GetStringLength(0, &familyNameLength); |
| |
| UINT32 size = familyNameLength+1; |
| SkSMallocWCHAR wFamilyName(size); |
| hr = familyNames->GetString(0, wFamilyName.get(), size); |
| |
| hr = sk_wchar_to_skstring(wFamilyName.get(), &info->fFontName); |
| |
| if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo) { |
| populate_glyph_to_unicode(fDWriteFontFace.get(), glyphCount, &(info->fGlyphToUnicode)); |
| } |
| |
| DWRITE_FONT_FACE_TYPE fontType = fDWriteFontFace->GetType(); |
| if (fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE || |
| fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION) { |
| info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; |
| } else { |
| info->fType = SkAdvancedTypefaceMetrics::kOther_Font; |
| info->fItalicAngle = 0; |
| info->fAscent = dwfm.ascent;; |
| info->fDescent = dwfm.descent; |
| info->fStemV = 0; |
| info->fCapHeight = dwfm.capHeight; |
| info->fBBox = SkIRect::MakeEmpty(); |
| return info; |
| } |
| |
| AutoTDWriteTable<SkOTTableHead> headTable(fDWriteFontFace.get()); |
| AutoTDWriteTable<SkOTTablePostScript> postTable(fDWriteFontFace.get()); |
| AutoTDWriteTable<SkOTTableHorizontalHeader> hheaTable(fDWriteFontFace.get()); |
| AutoTDWriteTable<SkOTTableOS2> os2Table(fDWriteFontFace.get()); |
| if (!headTable.fExists || !postTable.fExists || !hheaTable.fExists || !os2Table.fExists) { |
| info->fItalicAngle = 0; |
| info->fAscent = dwfm.ascent;; |
| info->fDescent = dwfm.descent; |
| info->fStemV = 0; |
| info->fCapHeight = dwfm.capHeight; |
| info->fBBox = SkIRect::MakeEmpty(); |
| return info; |
| } |
| |
| //There exist CJK fonts which set the IsFixedPitch and Monospace bits, |
| //but have full width, latin half-width, and half-width kana. |
| bool fixedWidth = (postTable->isFixedPitch && |
| (1 == SkEndian_SwapBE16(hheaTable->numberOfHMetrics))); |
| //Monospace |
| if (fixedWidth) { |
| info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; |
| } |
| //Italic |
| if (os2Table->version.v0.fsSelection.field.Italic) { |
| info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; |
| } |
| //Script |
| if (SkPanose::FamilyType::Script == os2Table->version.v0.panose.bFamilyType.value) { |
| info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
| //Serif |
| } else if (SkPanose::FamilyType::TextAndDisplay == os2Table->version.v0.panose.bFamilyType.value && |
| SkPanose::Data::TextAndDisplay::SerifStyle::Triangle <= os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value && |
| SkPanose::Data::TextAndDisplay::SerifStyle::NoFit != os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value) { |
| info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
| } |
| |
| info->fItalicAngle = SkEndian_SwapBE32(postTable->italicAngle) >> 16; |
| |
| info->fAscent = SkToS16(dwfm.ascent); |
| info->fDescent = SkToS16(dwfm.descent); |
| info->fCapHeight = SkToS16(dwfm.capHeight); |
| |
| info->fBBox = SkIRect::MakeLTRB((int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMin), |
| (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMax), |
| (int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMax), |
| (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMin)); |
| |
| //TODO: is this even desired? It seems PDF only wants this value for Type1 |
| //fonts, and we only get here for TrueType fonts. |
| info->fStemV = 0; |
| /* |
| // Figure out a good guess for StemV - Min width of i, I, !, 1. |
| // This probably isn't very good with an italic font. |
| int16_t min_width = SHRT_MAX; |
| info->fStemV = 0; |
| char stem_chars[] = {'i', 'I', '!', '1'}; |
| for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { |
| ABC abcWidths; |
| if (GetCharABCWidths(hdc, stem_chars[i], stem_chars[i], &abcWidths)) { |
| int16_t width = abcWidths.abcB; |
| if (width > 0 && width < min_width) { |
| min_width = width; |
| info->fStemV = min_width; |
| } |
| } |
| } |
| */ |
| |
| if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) { |
| if (fixedWidth) { |
| appendRange(&info->fGlyphWidths, 0); |
| int16_t advance; |
| getWidthAdvance(fDWriteFontFace.get(), 1, &advance); |
| info->fGlyphWidths->fAdvance.append(1, &advance); |
| finishRange(info->fGlyphWidths.get(), 0, |
| SkAdvancedTypefaceMetrics::WidthRange::kDefault); |
| } else { |
| info->fGlyphWidths.reset( |
| getAdvanceData(fDWriteFontFace.get(), |
| glyphCount, |
| glyphIDs, |
| glyphIDsCount, |
| getWidthAdvance)); |
| } |
| } |
| |
| return info; |
| } |
