1 2 /* 3 * Copyright 2010 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #include "GrTemplates.h" 11 #include "SkGr.h" 12 #include "SkDescriptor.h" 13 #include "SkGlyphCache.h" 14 15 class SkGrDescKey : public GrKey { 16 public: 17 explicit SkGrDescKey(const SkDescriptor& desc); 18 virtual ~SkGrDescKey(); 19 20 protected: 21 // overrides 22 virtual bool lt(const GrKey& rh) const; 23 virtual bool eq(const GrKey& rh) const; 24 25 private: 26 SkDescriptor* fDesc; 27 enum { 28 kMaxStorageInts = 16 29 }; 30 uint32_t fStorage[kMaxStorageInts]; 31 }; 32 33 /////////////////////////////////////////////////////////////////////////////// 34 35 SkGrDescKey::SkGrDescKey(const SkDescriptor& desc) : GrKey(desc.getChecksum()) { 36 size_t size = desc.getLength(); 37 if (size <= sizeof(fStorage)) { 38 fDesc = GrTCast<SkDescriptor*>(fStorage); 39 } else { 40 fDesc = SkDescriptor::Alloc(size); 41 } 42 memcpy(fDesc, &desc, size); 43 } 44 45 SkGrDescKey::~SkGrDescKey() { 46 if (fDesc != GrTCast<SkDescriptor*>(fStorage)) { 47 SkDescriptor::Free(fDesc); 48 } 49 } 50 51 bool SkGrDescKey::lt(const GrKey& rh) const { 52 const SkDescriptor* srcDesc = ((const SkGrDescKey*)&rh)->fDesc; 53 size_t lenLH = fDesc->getLength(); 54 size_t lenRH = srcDesc->getLength(); 55 int cmp = memcmp(fDesc, srcDesc, SkMin32(lenLH, lenRH)); 56 if (0 == cmp) { 57 return lenLH < lenRH; 58 } else { 59 return cmp < 0; 60 } 61 } 62 63 bool SkGrDescKey::eq(const GrKey& rh) const { 64 const SkDescriptor* srcDesc = ((const SkGrDescKey*)&rh)->fDesc; 65 return fDesc->equals(*srcDesc); 66 } 67 68 /////////////////////////////////////////////////////////////////////////////// 69 70 SkGrFontScaler::SkGrFontScaler(SkGlyphCache* strike) { 71 fStrike = strike; 72 fKey = NULL; 73 } 74 75 SkGrFontScaler::~SkGrFontScaler() { 76 GrSafeUnref(fKey); 77 } 78 79 GrMaskFormat SkGrFontScaler::getMaskFormat() { 80 SkMask::Format format = fStrike->getMaskFormat(); 81 switch (format) { 82 case SkMask::kBW_Format: 83 // fall through to kA8 -- we store BW glyphs in our 8-bit cache 84 case SkMask::kA8_Format: 85 return kA8_GrMaskFormat; 86 case SkMask::kLCD16_Format: 87 return kA565_GrMaskFormat; 88 case SkMask::kLCD32_Format: 89 return kA888_GrMaskFormat; 90 default: 91 GrAssert(!"unsupported SkMask::Format"); 92 return kA8_GrMaskFormat; 93 } 94 } 95 96 const GrKey* SkGrFontScaler::getKey() { 97 if (NULL == fKey) { 98 fKey = SkNEW_ARGS(SkGrDescKey, (fStrike->getDescriptor())); 99 } 100 return fKey; 101 } 102 103 bool SkGrFontScaler::getPackedGlyphBounds(GrGlyph::PackedID packed, 104 SkIRect* bounds) { 105 const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed), 106 GrGlyph::UnpackFixedX(packed), 107 GrGlyph::UnpackFixedY(packed)); 108 bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight); 109 return true; 110 111 } 112 113 namespace { 114 // expands each bit in a bitmask to 0 or ~0 of type INT_TYPE. Used to expand a BW glyph mask to 115 // A8, RGB565, or RGBA8888. 116 template <typename INT_TYPE> 117 void expand_bits(INT_TYPE* dst, 118 const uint8_t* src, 119 int width, 120 int height, 121 int dstRowBytes, 122 int srcRowBytes) { 123 for (int i = 0; i < height; ++i) { 124 int rowWritesLeft = width; 125 const uint8_t* s = src; 126 INT_TYPE* d = dst; 127 while (rowWritesLeft > 0) { 128 unsigned mask = *s++; 129 for (int i = 7; i >= 0 && rowWritesLeft; --i, --rowWritesLeft) { 130 *d++ = (mask & (1 << i)) ? (INT_TYPE)(~0UL) : 0; 131 } 132 } 133 dst = reinterpret_cast<INT_TYPE*>(reinterpret_cast<intptr_t>(dst) + dstRowBytes); 134 src += srcRowBytes; 135 } 136 } 137 } 138 139 bool SkGrFontScaler::getPackedGlyphImage(GrGlyph::PackedID packed, 140 int width, int height, 141 int dstRB, void* dst) { 142 const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed), 143 GrGlyph::UnpackFixedX(packed), 144 GrGlyph::UnpackFixedY(packed)); 145 GrAssert(glyph.fWidth == width); 146 GrAssert(glyph.fHeight == height); 147 const void* src = fStrike->findImage(glyph); 148 if (NULL == src) { 149 return false; 150 } 151 152 int srcRB = glyph.rowBytes(); 153 // The windows font host sometimes has BW glyphs in a non-BW strike. So it is important here to 154 // check the glyph's format, not the strike's format, and to be able to convert to any of the 155 // GrMaskFormats. 156 if (SkMask::kBW_Format == glyph.fMaskFormat) { 157 // expand bits to our mask type 158 const uint8_t* bits = reinterpret_cast<const uint8_t*>(src); 159 switch (this->getMaskFormat()) { 160 case kA8_GrMaskFormat:{ 161 uint8_t* bytes = reinterpret_cast<uint8_t*>(dst); 162 expand_bits(bytes, bits, width, height, dstRB, srcRB); 163 break; 164 } 165 case kA565_GrMaskFormat: { 166 uint16_t* rgb565 = reinterpret_cast<uint16_t*>(dst); 167 expand_bits(rgb565, bits, width, height, dstRB, srcRB); 168 break; 169 } 170 case kA888_GrMaskFormat: { 171 uint32_t* rgba8888 = reinterpret_cast<uint32_t*>(dst); 172 expand_bits(rgba8888, bits, width, height, dstRB, srcRB); 173 break; 174 } 175 default: 176 GrCrash("Unknown GrMaskFormat"); 177 } 178 } else if (srcRB == dstRB) { 179 memcpy(dst, src, dstRB * height); 180 } else { 181 const int bbp = GrMaskFormatBytesPerPixel(this->getMaskFormat()); 182 for (int y = 0; y < height; y++) { 183 memcpy(dst, src, width * bbp); 184 src = (const char*)src + srcRB; 185 dst = (char*)dst + dstRB; 186 } 187 } 188 return true; 189 } 190 191 // we should just return const SkPath* (NULL means false) 192 bool SkGrFontScaler::getGlyphPath(uint16_t glyphID, SkPath* path) { 193 194 const SkGlyph& glyph = fStrike->getGlyphIDMetrics(glyphID); 195 const SkPath* skPath = fStrike->findPath(glyph); 196 if (skPath) { 197 *path = *skPath; 198 return true; 199 } 200 return false; 201 } 202
