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 "GrRect.h" 12 #include "SkPath.h" 13 #include "SkChecksum.h" 14 15 class GrPlot; 16 17 /* Need this to be quad-state: 18 - complete w/ image 19 - just metrics 20 - failed to get image, but has metrics 21 - failed to get metrics 22 */ 23 struct GrGlyph { 24 typedef uint32_t PackedID; 25 26 GrPlot* fPlot; 27 SkPath* fPath; 28 PackedID fPackedID; 29 GrIRect16 fBounds; 30 SkIPoint16 fAtlasLocation; 31 initGrGlyph32 void init(GrGlyph::PackedID packed, const SkIRect& bounds) { 33 fPlot = NULL; 34 fPath = NULL; 35 fPackedID = packed; 36 fBounds.set(bounds); 37 fAtlasLocation.set(0, 0); 38 } 39 freeGrGlyph40 void free() { 41 if (fPath) { 42 delete fPath; 43 fPath = NULL; 44 } 45 } 46 widthGrGlyph47 int width() const { return fBounds.width(); } heightGrGlyph48 int height() const { return fBounds.height(); } isEmptyGrGlyph49 bool isEmpty() const { return fBounds.isEmpty(); } glyphIDGrGlyph50 uint16_t glyphID() const { return UnpackID(fPackedID); } 51 52 /////////////////////////////////////////////////////////////////////////// 53 ExtractSubPixelBitsFromFixedGrGlyph54 static inline unsigned ExtractSubPixelBitsFromFixed(SkFixed pos) { 55 // two most significant fraction bits from fixed-point 56 return (pos >> 14) & 3; 57 } 58 PackGrGlyph59 static inline PackedID Pack(uint16_t glyphID, SkFixed x, SkFixed y) { 60 x = ExtractSubPixelBitsFromFixed(x); 61 y = ExtractSubPixelBitsFromFixed(y); 62 return (x << 18) | (y << 16) | glyphID; 63 } 64 UnpackFixedXGrGlyph65 static inline SkFixed UnpackFixedX(PackedID packed) { 66 return ((packed >> 18) & 3) << 14; 67 } 68 UnpackFixedYGrGlyph69 static inline SkFixed UnpackFixedY(PackedID packed) { 70 return ((packed >> 16) & 3) << 14; 71 } 72 UnpackIDGrGlyph73 static inline uint16_t UnpackID(PackedID packed) { 74 return (uint16_t)packed; 75 } 76 GetKeyGrGlyph77 static inline const GrGlyph::PackedID& GetKey(const GrGlyph& glyph) { 78 return glyph.fPackedID; 79 } 80 HashGrGlyph81 static inline uint32_t Hash(GrGlyph::PackedID key) { 82 return SkChecksum::Murmur3(&key, sizeof(key)); 83 } 84 }; 85 86 #endif 87