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 14 class GrPlot; 15 16 /* Need this to be quad-state: 17 - complete w/ image 18 - just metrics 19 - failed to get image, but has metrics 20 - failed to get metrics 21 */ 22 struct GrGlyph { 23 typedef uint32_t PackedID; 24 25 GrPlot* fPlot; 26 SkPath* fPath; 27 PackedID fPackedID; 28 GrIRect16 fBounds; 29 GrIPoint16 fAtlasLocation; 30 initGrGlyph31 void init(GrGlyph::PackedID packed, const SkIRect& bounds) { 32 fPlot = NULL; 33 fPath = NULL; 34 fPackedID = packed; 35 fBounds.set(bounds); 36 fAtlasLocation.set(0, 0); 37 } 38 freeGrGlyph39 void free() { 40 if (fPath) { 41 delete fPath; 42 fPath = NULL; 43 } 44 } 45 widthGrGlyph46 int width() const { return fBounds.width(); } heightGrGlyph47 int height() const { return fBounds.height(); } isEmptyGrGlyph48 bool isEmpty() const { return fBounds.isEmpty(); } glyphIDGrGlyph49 uint16_t glyphID() const { return UnpackID(fPackedID); } 50 51 /////////////////////////////////////////////////////////////////////////// 52 ExtractSubPixelBitsFromFixedGrGlyph53 static inline unsigned ExtractSubPixelBitsFromFixed(GrFixed pos) { 54 // two most significant fraction bits from fixed-point 55 return (pos >> 14) & 3; 56 } 57 PackGrGlyph58 static inline PackedID Pack(uint16_t glyphID, GrFixed x, GrFixed y) { 59 x = ExtractSubPixelBitsFromFixed(x); 60 y = ExtractSubPixelBitsFromFixed(y); 61 return (x << 18) | (y << 16) | glyphID; 62 } 63 UnpackFixedXGrGlyph64 static inline GrFixed UnpackFixedX(PackedID packed) { 65 return ((packed >> 18) & 3) << 14; 66 } 67 UnpackFixedYGrGlyph68 static inline GrFixed UnpackFixedY(PackedID packed) { 69 return ((packed >> 16) & 3) << 14; 70 } 71 UnpackIDGrGlyph72 static inline uint16_t UnpackID(PackedID packed) { 73 return (uint16_t)packed; 74 } 75 }; 76 77 78 #endif 79