1 #include "SkEndian.h" 2 #include "SkSfntUtils.h" 3 4 static uint16_t parse_be16(const uint8_t*& p) { 5 uint16_t value = (p[0] << 8) | p[1]; 6 p += 2; 7 return value; 8 } 9 10 static uint32_t parse_be32(const uint8_t*& p) { 11 uint32_t value = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; 12 p += 4; 13 return value; 14 } 15 16 static Sk64 parse_be64(const uint8_t*& p) { 17 Sk64 value; 18 value.fHi = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; 19 value.fLo = (p[4] << 24) | (p[5] << 16) | (p[6] << 8) | p[7]; 20 p += 8; 21 return value; 22 } 23 24 /////////////////////////////////////////////////////////////////////////////// 25 26 bool SkSfntUtils::ReadTable_head(SkFontID fontID, SkSfntTable_head* head) { 27 static const uint32_t gTag = SkSetFourByteTag('h', 'e', 'a', 'd'); 28 static const size_t gSize = 54; 29 30 uint8_t storage[gSize]; 31 size_t size = SkFontHost::GetTableData(fontID, gTag, 0, gSize, storage); 32 if (size != gSize) { 33 return false; 34 } 35 36 const uint8_t* p = storage; 37 head->fVersion = parse_be32(p); 38 head->fRevision = parse_be32(p); 39 head->fCheckSumAdjustment = parse_be32(p); 40 head->fMagicNumber = parse_be32(p); 41 head->fFlags = parse_be16(p); 42 head->fUnitsPerEm = parse_be16(p); 43 head->fDateCreated = parse_be64(p); 44 head->fDateModified = parse_be64(p); 45 head->fXMin = parse_be16(p); 46 head->fXMin = parse_be16(p); 47 head->fXMin = parse_be16(p); 48 head->fXMin = parse_be16(p); 49 head->fMacStyle = parse_be16(p); 50 head->fLowestPPEM = parse_be16(p); 51 head->fFontDirectionHint = parse_be16(p); 52 head->fIndexToLocFormat = parse_be16(p); 53 head->fGlyphDataFormat = parse_be16(p); 54 SkASSERT(p - storage == (long)size); 55 return true; 56 } 57 58 bool SkSfntUtils::ReadTable_maxp(SkFontID fontID, SkSfntTable_maxp* maxp) { 59 static const uint32_t gTag = SkSetFourByteTag('m', 'a', 'x', 'p'); 60 static const size_t gSize = 32; 61 62 uint8_t storage[gSize]; 63 size_t size = SkFontHost::GetTableData(fontID, gTag, 0, gSize, storage); 64 if (size != gSize) { 65 return false; 66 } 67 68 const uint8_t* p = storage; 69 maxp->fVersion = parse_be32(p); 70 maxp->fNumGlyphs = parse_be16(p); 71 maxp->fMaxPoints = parse_be16(p); 72 maxp->fMaxContours = parse_be16(p); 73 maxp->fMaxComponentPoints = parse_be16(p); 74 maxp->fMaxComponentContours = parse_be16(p); 75 maxp->fMaxZones = parse_be16(p); 76 maxp->fMaxTwilightPoints = parse_be16(p); 77 maxp->fMaxStorage = parse_be16(p); 78 maxp->fMaxFunctionDefs = parse_be16(p); 79 maxp->fMaxInstructionDefs = parse_be16(p); 80 maxp->fMaxStackElements = parse_be16(p); 81 maxp->fMaxSizeOfInstructions = parse_be16(p); 82 maxp->fMaxComponentElements = parse_be16(p); 83 maxp->fMaxComponentDepth = parse_be16(p); 84 SkASSERT(p - storage == (long)size); 85 return true; 86 } 87 88
