1 /* 2 * Copyright 2010 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrGlyph_DEFINED 9 #define GrGlyph_DEFINED 10 11 #include "GrDrawOpAtlas.h" 12 #include "GrRect.h" 13 #include "GrTypes.h" 14 15 #include "SkChecksum.h" 16 #include "SkFixed.h" 17 #include "SkPath.h" 18 19 /* Need this to be quad-state: 20 - complete w/ image 21 - just metrics 22 - failed to get image, but has metrics 23 - failed to get metrics 24 */ 25 struct GrGlyph { 26 enum MaskStyle { 27 kCoverage_MaskStyle, 28 kDistance_MaskStyle 29 }; 30 31 typedef uint32_t PackedID; 32 33 GrDrawOpAtlas::AtlasID fID; 34 SkPath* fPath; 35 PackedID fPackedID; 36 GrMaskFormat fMaskFormat; 37 GrIRect16 fBounds; 38 SkIPoint16 fAtlasLocation; 39 bool fTooLargeForAtlas; 40 initGrGlyph41 void init(GrGlyph::PackedID packed, const SkIRect& bounds, GrMaskFormat format) { 42 fID = GrDrawOpAtlas::kInvalidAtlasID; 43 fPath = nullptr; 44 fPackedID = packed; 45 fBounds.set(bounds); 46 fMaskFormat = format; 47 fAtlasLocation.set(0, 0); 48 fTooLargeForAtlas = GrDrawOpAtlas::GlyphTooLargeForAtlas(bounds.width(), bounds.height()); 49 } 50 resetGrGlyph51 void reset() { 52 if (fPath) { 53 delete fPath; 54 fPath = nullptr; 55 } 56 } 57 widthGrGlyph58 int width() const { return fBounds.width(); } heightGrGlyph59 int height() const { return fBounds.height(); } isEmptyGrGlyph60 bool isEmpty() const { return fBounds.isEmpty(); } glyphIDGrGlyph61 uint16_t glyphID() const { return UnpackID(fPackedID); } pageIndexGrGlyph62 uint32_t pageIndex() const { return GrDrawOpAtlas::GetPageIndexFromID(fID); } 63 64 /////////////////////////////////////////////////////////////////////////// 65 ExtractSubPixelBitsFromFixedGrGlyph66 static inline unsigned ExtractSubPixelBitsFromFixed(SkFixed pos) { 67 // two most significant fraction bits from fixed-point 68 return (pos >> 14) & 3; 69 } 70 PackGrGlyph71 static inline PackedID Pack(uint16_t glyphID, SkFixed x, SkFixed y, MaskStyle ms) { 72 x = ExtractSubPixelBitsFromFixed(x); 73 y = ExtractSubPixelBitsFromFixed(y); 74 int dfFlag = (ms == kDistance_MaskStyle) ? 0x1 : 0x0; 75 return (dfFlag << 20) | (x << 18) | (y << 16) | glyphID; 76 } 77 UnpackFixedXGrGlyph78 static inline SkFixed UnpackFixedX(PackedID packed) { 79 return ((packed >> 18) & 3) << 14; 80 } 81 UnpackFixedYGrGlyph82 static inline SkFixed UnpackFixedY(PackedID packed) { 83 return ((packed >> 16) & 3) << 14; 84 } 85 UnpackMaskStyleGrGlyph86 static inline MaskStyle UnpackMaskStyle(PackedID packed) { 87 return ((packed >> 20) & 1) ? kDistance_MaskStyle : kCoverage_MaskStyle; 88 } 89 UnpackIDGrGlyph90 static inline uint16_t UnpackID(PackedID packed) { 91 return (uint16_t)packed; 92 } 93 GetKeyGrGlyph94 static inline const GrGlyph::PackedID& GetKey(const GrGlyph& glyph) { 95 return glyph.fPackedID; 96 } 97 HashGrGlyph98 static inline uint32_t Hash(GrGlyph::PackedID key) { 99 return SkChecksum::Mix(key); 100 } 101 }; 102 103 #endif 104