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      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 
     32     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 
     40     void free() {
     41         if (fPath) {
     42             delete fPath;
     43             fPath = NULL;
     44         }
     45     }
     46 
     47     int width() const { return fBounds.width(); }
     48     int height() const { return fBounds.height(); }
     49     bool isEmpty() const { return fBounds.isEmpty(); }
     50     uint16_t glyphID() const { return UnpackID(fPackedID); }
     51 
     52     ///////////////////////////////////////////////////////////////////////////
     53 
     54     static inline unsigned ExtractSubPixelBitsFromFixed(SkFixed pos) {
     55         // two most significant fraction bits from fixed-point
     56         return (pos >> 14) & 3;
     57     }
     58 
     59     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 
     65     static inline SkFixed UnpackFixedX(PackedID packed) {
     66         return ((packed >> 18) & 3) << 14;
     67     }
     68 
     69     static inline SkFixed UnpackFixedY(PackedID packed) {
     70         return ((packed >> 16) & 3) << 14;
     71     }
     72 
     73     static inline uint16_t UnpackID(PackedID packed) {
     74         return (uint16_t)packed;
     75     }
     76 
     77     static inline const GrGlyph::PackedID& GetKey(const GrGlyph& glyph) {
     78         return glyph.fPackedID;
     79     }
     80 
     81     static inline uint32_t Hash(GrGlyph::PackedID key) {
     82         return SkChecksum::Murmur3(&key, sizeof(key));
     83     }
     84 };
     85 
     86 #endif
     87