gfx/skia/trunk/src/core/SkGlyph.h@129ffea94266
gfx/skia/trunk/src/core/SkGlyph.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #ifndef SkGlyph_DEFINED
9 #define SkGlyph_DEFINED
11 #include "SkTypes.h"
12 #include "SkFixed.h"
13 #include "SkMask.h"
15 class SkPath;
17 // needs to be != to any valid SkMask::Format
18 #define MASK_FORMAT_UNKNOWN (0xFF)
19 #define MASK_FORMAT_JUST_ADVANCE MASK_FORMAT_UNKNOWN
21 #define kMaxGlyphWidth (1<<13)
23 struct SkGlyph {
24 void* fImage;
25 SkPath* fPath;
26 SkFixed fAdvanceX, fAdvanceY;
28 uint32_t fID;
29 uint16_t fWidth, fHeight;
30 int16_t fTop, fLeft;
32 uint8_t fMaskFormat;
33 int8_t fRsbDelta, fLsbDelta; // used by auto-kerning
35 void init(uint32_t id) {
36 fID = id;
37 fImage = NULL;
38 fPath = NULL;
39 fMaskFormat = MASK_FORMAT_UNKNOWN;
40 }
42 /**
43 * Compute the rowbytes for the specified width and mask-format.
44 */
45 static unsigned ComputeRowBytes(unsigned width, SkMask::Format format) {
46 unsigned rb = width;
47 if (SkMask::kBW_Format == format) {
48 rb = (rb + 7) >> 3;
49 } else if (SkMask::kARGB32_Format == format ||
50 SkMask::kLCD32_Format == format)
51 {
52 rb <<= 2;
53 } else if (SkMask::kLCD16_Format == format) {
54 rb = SkAlign4(rb << 1);
55 } else {
56 rb = SkAlign4(rb);
57 }
58 return rb;
59 }
61 unsigned rowBytes() const {
62 return ComputeRowBytes(fWidth, (SkMask::Format)fMaskFormat);
63 }
65 bool isJustAdvance() const {
66 return MASK_FORMAT_JUST_ADVANCE == fMaskFormat;
67 }
69 bool isFullMetrics() const {
70 return MASK_FORMAT_JUST_ADVANCE != fMaskFormat;
71 }
73 uint16_t getGlyphID() const {
74 return ID2Code(fID);
75 }
77 unsigned getGlyphID(unsigned baseGlyphCount) const {
78 unsigned code = ID2Code(fID);
79 SkASSERT(code >= baseGlyphCount);
80 return code - baseGlyphCount;
81 }
83 unsigned getSubX() const {
84 return ID2SubX(fID);
85 }
87 SkFixed getSubXFixed() const {
88 return SubToFixed(ID2SubX(fID));
89 }
91 SkFixed getSubYFixed() const {
92 return SubToFixed(ID2SubY(fID));
93 }
95 size_t computeImageSize() const;
97 /** Call this to set all of the metrics fields to 0 (e.g. if the scaler
98 encounters an error measuring a glyph). Note: this does not alter the
99 fImage, fPath, fID, fMaskFormat fields.
100 */
101 void zeroMetrics();
103 enum {
104 kSubBits = 2,
105 kSubMask = ((1 << kSubBits) - 1),
106 kSubShift = 24, // must be large enough for glyphs and unichars
107 kCodeMask = ((1 << kSubShift) - 1),
108 // relative offsets for X and Y subpixel bits
109 kSubShiftX = kSubBits,
110 kSubShiftY = 0
111 };
113 static unsigned ID2Code(uint32_t id) {
114 return id & kCodeMask;
115 }
117 static unsigned ID2SubX(uint32_t id) {
118 return id >> (kSubShift + kSubShiftX);
119 }
121 static unsigned ID2SubY(uint32_t id) {
122 return (id >> (kSubShift + kSubShiftY)) & kSubMask;
123 }
125 static unsigned FixedToSub(SkFixed n) {
126 return (n >> (16 - kSubBits)) & kSubMask;
127 }
129 static SkFixed SubToFixed(unsigned sub) {
130 SkASSERT(sub <= kSubMask);
131 return sub << (16 - kSubBits);
132 }
134 static uint32_t MakeID(unsigned code) {
135 return code;
136 }
138 static uint32_t MakeID(unsigned code, SkFixed x, SkFixed y) {
139 SkASSERT(code <= kCodeMask);
140 x = FixedToSub(x);
141 y = FixedToSub(y);
142 return (x << (kSubShift + kSubShiftX)) |
143 (y << (kSubShift + kSubShiftY)) |
144 code;
145 }
147 void toMask(SkMask* mask) const;
148 };
150 #endif
