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 "GrBatchAtlas.h" 12 #include "GrRect.h" 13 #include "GrTypes.h" 14 15 #include "SkChecksum.h" 16 #include "SkPath.h" 17 18 class GrPlot; 19 20 /* Need this to be quad-state: 21 - complete w/ image 22 - just metrics 23 - failed to get image, but has metrics 24 - failed to get metrics 25 */ 26 struct GrGlyph { 27 enum MaskStyle { 28 kCoverage_MaskStyle, 29 kDistance_MaskStyle 30 }; 31 32 typedef uint32_t PackedID; 33 34 GrBatchAtlas::AtlasID fID; 35 SkPath* fPath; 36 PackedID fPackedID; 37 GrMaskFormat fMaskFormat; 38 GrIRect16 fBounds; 39 SkIPoint16 fAtlasLocation; 40 bool fTooLargeForAtlas; 41 initGrGlyph42 void init(GrGlyph::PackedID packed, const SkIRect& bounds, GrMaskFormat format) { 43 fID = GrBatchAtlas::kInvalidAtlasID; 44 fPath = nullptr; 45 fPackedID = packed; 46 fBounds.set(bounds); 47 fMaskFormat = format; 48 fAtlasLocation.set(0, 0); 49 fTooLargeForAtlas = GrBatchAtlas::GlyphTooLargeForAtlas(bounds.width(), bounds.height()); 50 } 51 freeGrGlyph52 void free() { 53 if (fPath) { 54 delete fPath; 55 fPath = nullptr; 56 } 57 } 58 widthGrGlyph59 int width() const { return fBounds.width(); } heightGrGlyph60 int height() const { return fBounds.height(); } isEmptyGrGlyph61 bool isEmpty() const { return fBounds.isEmpty(); } glyphIDGrGlyph62 uint16_t glyphID() const { return UnpackID(fPackedID); } 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