1
2/*
3 * Copyright 2010 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10
11#ifndef GrGlyph_DEFINED
12#define GrGlyph_DEFINED
13
14#include "GrPath.h"
15#include "GrRect.h"
16
17class GrAtlas;
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 */
25struct GrGlyph {
26    typedef uint32_t PackedID;
27
28    GrAtlas*    fAtlas;
29    GrPath*     fPath;
30    PackedID    fPackedID;
31    GrIRect16   fBounds;
32    GrIPoint16  fAtlasLocation;
33
34    void init(GrGlyph::PackedID packed, const GrIRect& bounds) {
35        fAtlas = NULL;
36        fPath = NULL;
37        fPackedID = packed;
38        fBounds.set(bounds);
39        fAtlasLocation.set(0, 0);
40    }
41
42    void free() {
43        if (fPath) {
44            delete fPath;
45            fPath = NULL;
46        }
47    }
48
49    int width() const { return fBounds.width(); }
50    int height() const { return fBounds.height(); }
51    bool isEmpty() const { return fBounds.isEmpty(); }
52    uint16_t glyphID() const { return UnpackID(fPackedID); }
53
54    ///////////////////////////////////////////////////////////////////////////
55
56    static inline unsigned ExtractSubPixelBitsFromFixed(GrFixed pos) {
57        // two most significant fraction bits from fixed-point
58        return (pos >> 14) & 3;
59    }
60
61    static inline PackedID Pack(uint16_t glyphID, GrFixed x, GrFixed y) {
62        x = ExtractSubPixelBitsFromFixed(x);
63        y = ExtractSubPixelBitsFromFixed(y);
64        return (x << 18) | (y << 16) | glyphID;
65    }
66
67    static inline GrFixed UnpackFixedX(PackedID packed) {
68        return ((packed >> 18) & 3) << 14;
69    }
70
71    static inline GrFixed UnpackFixedY(PackedID packed) {
72        return ((packed >> 16) & 3) << 14;
73    }
74
75    static inline uint16_t UnpackID(PackedID packed) {
76        return (uint16_t)packed;
77    }
78};
79
80
81#endif
82
83