From ab0ab4a601356160f2e49d7935ddd0f559a848e2 Mon Sep 17 00:00:00 2001 From: "caryclark@google.com" Date: Wed, 1 Jun 2011 20:15:20 +0000 Subject: committing http://codereview.appspot.com/4515175/ git-svn-id: http://skia.googlecode.com/svn/trunk@1473 2bbb7eff-a529-9590-31e7-b0007b416f81 --- src/ports/SkFontHost_mac_coretext.cpp | 220 +++++++++++++++++++++++++++++++++- 1 file changed, 216 insertions(+), 4 deletions(-) (limited to 'src/ports') diff --git a/src/ports/SkFontHost_mac_coretext.cpp b/src/ports/SkFontHost_mac_coretext.cpp index 7898ec3434..ad57e16f91 100644 --- a/src/ports/SkFontHost_mac_coretext.cpp +++ b/src/ports/SkFontHost_mac_coretext.cpp @@ -18,13 +18,17 @@ #include "SkFontHost.h" #include "SkDescriptor.h" +#include "SkEndian.h" #include "SkFloatingPoint.h" #include "SkPaint.h" #include "SkString.h" +#include "SkStream.h" #include "SkTypeface_mac.h" #include "SkUtils.h" #include "SkTypefaceCache.h" +using namespace skia_advanced_typeface_metrics_utils; + static const size_t FONT_CACHE_MEMORY_BUDGET = 1024 * 1024; static const char FONT_DEFAULT_NAME[] = "Lucida Sans"; @@ -626,12 +630,141 @@ SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) return SkFontHost::CreateTypeface(NULL, NULL, NULL, NULL, SkTypeface::kNormal); } +// Construct Glyph to Unicode table. +// Unicode code points that require conjugate pairs in utf16 are not +// supported. +static void populate_glyph_to_unicode(CTFontRef ctFont, + const unsigned glyphCount, SkTDArray* glyphToUnicode) { + CFCharacterSetRef charSet = CTFontCopyCharacterSet(ctFont); + CFDataRef bitmap = CFCharacterSetCreateBitmapRepresentation( + kCFAllocatorDefault, charSet); + if (!bitmap) { + return; + } + CFIndex length = CFDataGetLength(bitmap); + if (!length) { + CFSafeRelease(bitmap); + return; + } + if (length > 8192) { + // TODO: Add support for Unicode above 0xFFFF + // Consider only the BMP portion of the Unicode character points. + // The bitmap may contain other planes, up to plane 16. + // See http://developer.apple.com/library/ios/#documentation/CoreFoundation/Reference/CFCharacterSetRef/Reference/reference.html + length = 8192; + } + const UInt8* bits = CFDataGetBytePtr(bitmap); + glyphToUnicode->setCount(glyphCount); + SkUnichar* out = glyphToUnicode->begin(); + sk_bzero(out, glyphCount * sizeof(SkUnichar)); + for (int i = 0; i < length; i++) { + int mask = bits[i]; + if (!mask) { + continue; + } + for (int j = 0; j < 8; j++) { + CGGlyph glyph; + UniChar unichar = static_cast((i << 3) + j); + if (mask & (1 << j) && CTFontGetGlyphsForCharacters(ctFont, + &unichar, &glyph, 1)) { + out[glyph] = unichar; + } + } + } + CFSafeRelease(bitmap); +} + +static bool getWidthAdvance(CTFontRef ctFont, int gId, int16_t* data) { + CGSize advance; + advance.width = 0; + CGGlyph glyph = gId; + CTFontGetAdvancesForGlyphs(ctFont, kCTFontHorizontalOrientation, &glyph, + &advance, 1); + *data = advance.width; + return true; +} + // static SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics( uint32_t fontID, SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo) { - SkASSERT(!"SkFontHost::GetAdvancedTypefaceMetrics unimplemented"); - return NULL; + CTFontRef ctFont = GetFontRefFromFontID(fontID); + SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; + CFStringRef fontName = CTFontCopyPostScriptName(ctFont); + int length = CFStringGetMaximumSizeForEncoding(CFStringGetLength(fontName), + kCFStringEncodingUTF8); + info->fFontName.resize(length); + CFStringGetCString(fontName, info->fFontName.writable_str(), length, + kCFStringEncodingUTF8); + info->fMultiMaster = false; + CFIndex glyphCount = CTFontGetGlyphCount(ctFont); + info->fLastGlyphID = SkToU16(glyphCount - 1); + info->fEmSize = CTFontGetUnitsPerEm(ctFont); + + if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo) { + populate_glyph_to_unicode(ctFont, glyphCount, &info->fGlyphToUnicode); + } + + // TODO: get font type, ala: + // CFTypeRef attr = CTFontCopyAttribute(ctFont, kCTFontFormatAttribute); + info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; + info->fStyle = 0; + CTFontSymbolicTraits symbolicTraits = CTFontGetSymbolicTraits(ctFont); + if (symbolicTraits & kCTFontMonoSpaceTrait) { + info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; + } + if (symbolicTraits & kCTFontItalicTrait) { + info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; + } + CTFontStylisticClass stylisticClass = symbolicTraits & + kCTFontClassMaskTrait; + if (stylisticClass & kCTFontSymbolicClass) { + info->fStyle |= SkAdvancedTypefaceMetrics::kSymbolic_Style; + } + if (stylisticClass >= kCTFontOldStyleSerifsClass + && stylisticClass <= kCTFontSlabSerifsClass) { + info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; + } else if (stylisticClass & kCTFontScriptsClass) { + info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; + } + info->fItalicAngle = CTFontGetSlantAngle(ctFont); + info->fAscent = CTFontGetAscent(ctFont); + info->fDescent = CTFontGetDescent(ctFont); + info->fCapHeight = CTFontGetCapHeight(ctFont); + CGRect bbox = CTFontGetBoundingBox(ctFont); + info->fBBox = SkIRect::MakeXYWH(bbox.origin.x, bbox.origin.y, + bbox.size.width, bbox.size.height); + + // 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; + static const UniChar stem_chars[] = {'i', 'I', '!', '1'}; + const size_t count = sizeof(stem_chars) / sizeof(stem_chars[0]); + CGGlyph glyphs[count]; + CGRect boundingRects[count]; + if (CTFontGetGlyphsForCharacters(ctFont, stem_chars, glyphs, count)) { + CTFontGetBoundingRectsForGlyphs(ctFont, kCTFontHorizontalOrientation, + glyphs, boundingRects, count); + for (size_t i = 0; i < count; i++) { + int16_t width = boundingRects[i].size.width; + if (width > 0 && width < min_width) { + min_width = width; + info->fStemV = min_width; + } + } + } + + if (false) { // TODO: haven't figured out how to know if font is embeddable + // (information is in the OS/2 table) + info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font; + } else if (perGlyphInfo & + SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) { + info->fGlyphWidths.reset( + getAdvanceData(ctFont, glyphCount, &getWidthAdvance)); + } + + return info; } /////////////////////////////////////////////////////////////////////////////// @@ -640,9 +773,88 @@ bool SkFontHost::ValidFontID(SkFontID fontID) { return SkTypefaceCache::FindByID(fontID) != NULL; } +struct FontHeader { + SkFixed fVersion; + uint16_t fNumTables; + uint16_t fSearchRange; + uint16_t fEntrySelector; + uint16_t fRangeShift; +}; + +struct TableEntry { + uint32_t fTag; + uint32_t fCheckSum; + uint32_t fOffset; + uint32_t fLength; +}; + +static uint32 CalcTableCheckSum(uint32 *table, uint32 numberOfBytesInTable) { + uint32 sum = 0; + uint32 nLongs = (numberOfBytesInTable + 3) / 4; + + while (nLongs-- > 0) { + sum += SkEndian_SwapBE32(*table++); + } + return sum; +} + SkStream* SkFontHost::OpenStream(SkFontID uniqueID) { - SkASSERT(!"SkFontHost::OpenStream unimplemented"); - return(NULL); + // get table tags + int tableCount = CountTables(uniqueID); + SkTDArray tableTags; + tableTags.setCount(tableCount); + GetTableTags(uniqueID, tableTags.begin()); + + // calc total size for font, save sizes + SkTDArray tableSizes; + size_t totalSize = sizeof(FontHeader) + sizeof(TableEntry) * tableCount; + for (int index = 0; index < tableCount; ++index) { + size_t tableSize = GetTableSize(uniqueID, tableTags[index]); + totalSize += (tableSize + 3) & ~3; + *tableSizes.append() = tableSize; + } + + // reserve memory for stream, and zero it (tables must be zero padded) + SkMemoryStream* stream = new SkMemoryStream(totalSize); + char* dataStart = (char*)stream->getMemoryBase(); + sk_bzero(dataStart, totalSize); + char* dataPtr = dataStart; + + // compute font header entries + uint16_t entrySelector = 0; + uint16_t searchRange = 1; + while (searchRange < tableCount >> 1) { + entrySelector++; + searchRange <<= 1; + } + searchRange <<= 4; + uint16_t rangeShift = (tableCount << 4) - searchRange; + + // write font header (also called sfnt header, offset subtable) + FontHeader* offsetTable = (FontHeader*)dataPtr; + offsetTable->fVersion = SkEndian_SwapBE32(SK_Fixed1); + offsetTable->fNumTables = SkEndian_SwapBE16(tableCount); + offsetTable->fSearchRange = SkEndian_SwapBE16(searchRange); + offsetTable->fEntrySelector = SkEndian_SwapBE16(entrySelector); + offsetTable->fRangeShift = SkEndian_SwapBE16(rangeShift); + dataPtr += sizeof(FontHeader); + + // write tables + TableEntry* entry = (TableEntry*)dataPtr; + dataPtr += sizeof(TableEntry) * tableCount; + for (int index = 0; index < tableCount; ++index) { + size_t tableSize = tableSizes[index]; + GetTableData(uniqueID, tableTags[index], 0, tableSize, dataPtr); + entry->fTag = SkEndian_SwapBE32(tableTags[index]); + entry->fCheckSum = SkEndian_SwapBE32(CalcTableCheckSum( + (uint32*)dataPtr, tableSize)); + entry->fOffset = SkEndian_SwapBE32(dataPtr - dataStart); + entry->fLength = SkEndian_SwapBE32(tableSize); + dataPtr += (tableSize + 3) & ~3; + ++entry; + } + + return stream; } size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length, -- cgit v1.2.3