1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkFont_DEFINED
#define SkFont_DEFINED
#include "SkRefCnt.h"
#include "SkScalar.h"
class SkPaint;
class SkTypeface;
enum SkTextEncoding {
kUTF8_SkTextEncoding,
kUTF16_SkTextEncoding,
kUTF32_SkTextEncoding,
kGlyphID_SkTextEncoding,
};
/*
1. The Hinting enum in SkPaint is gone entirely, absorbed into SkFont's flags.
2. SkPaint Flags look like this today
enum Flags {
kAntiAlias_Flag = 0x01, //!< mask to enable antialiasing
kDither_Flag = 0x04, //!< mask to enable dithering
kUnderlineText_Flag = 0x08, //!< mask to enable underline text
kStrikeThruText_Flag = 0x10, //!< mask to enable strike-thru text
kFakeBoldText_Flag = 0x20, //!< mask to enable fake-bold text
kLinearText_Flag = 0x40, //!< mask to enable linear-text
kSubpixelText_Flag = 0x80, //!< mask to enable subpixel text positioning
kDevKernText_Flag = 0x100, //!< mask to enable device kerning text
kLCDRenderText_Flag = 0x200, //!< mask to enable subpixel glyph renderering
kEmbeddedBitmapText_Flag = 0x400, //!< mask to enable embedded bitmap strikes
kAutoHinting_Flag = 0x800, //!< mask to force Freetype's autohinter
kVerticalText_Flag = 0x1000,
kGenA8FromLCD_Flag = 0x2000, // hack for GDI -- do not use if you can help it
};
SkFont would absorb these:
kFakeBoldText_Flag = 0x20, //!< mask to enable fake-bold text
kLinearText_Flag = 0x40, //!< mask to enable linear-text
kSubpixelText_Flag = 0x80, //!< mask to enable subpixel text positioning
kDevKernText_Flag = 0x100, //!< mask to enable device kerning text
kLCDRenderText_Flag = 0x200, //!< mask to enable subpixel glyph renderering
kEmbeddedBitmapText_Flag = 0x400, //!< mask to enable embedded bitmap strikes
kAutoHinting_Flag = 0x800, //!< mask to force Freetype's autohinter
kVerticalText_Flag = 0x1000,
kGenA8FromLCD_Flag = 0x2000, // hack for GDI -- do not use if you can help it
leaving these still in paint
kAntiAlias_Flag = 0x01, //!< mask to enable antialiasing
kDither_Flag = 0x04, //!< mask to enable dithering
kUnderlineText_Flag = 0x08, //!< mask to enable underline text
kStrikeThruText_Flag = 0x10, //!< mask to enable strike-thru text
3. Antialiasing
SkFont has a mask-type: BW, AA, LCD
SkPaint has antialias boolean
What to do if the font's mask-type disagrees with the paint?
*/
class SkFont : public SkRefCnt {
public:
enum Flags {
/**
* Use the system's automatic hinting mechanism to hint the typeface.
* This is a last resort hinting method applied only if other hinting methods do not apply.
* TODO: where to put auto-normal vs auto-light?
*/
kEnableAutoHints_Flag = 1 << 0,
/**
* If the typeface contains explicit bytecodes for hinting, use them.
* If both bytecode and auto hints are specified, attempt to use the bytecodes first;
* if that fails (e.g. there are no codes), then attempt to autohint.
*/
kEnableByteCodeHints_Flag = 1 << 1,
/**
* If the typeface contains explicit bitmaps for hinting, use them.
* If both bytecode and auto hints are also specified, attempt to use the bitmaps first;
* if that fails (e.g. there are no bitmaps), then attempt to bytecode or autohint.
*/
kEmbeddedBitmaps_Flag = 1 << 2,
/**
* Use rounded metric values (e.g. advance).
* If either auto or bytecode hinting was used, apply those results to the metrics of the
* glyphs as well. If no hinting was applied, the metrics will just be rounded to the
* nearest integer.
*
* This applies to calls that return metrics (e.g. measureText) and to drawing the glyphs
* (see SkCanvas drawText and drawPosText).
*/
kUseNonlinearMetrics_Flag = 1 << 3,
kVertical_Flag = 1 << 4,
kGenA8FromLCD_Flag = 1 << 5,
kEmbolden_Flag = 1 << 6,
kDevKern_Flag = 1 << 7, // ifdef ANDROID ?
};
enum MaskType {
kBW_MaskType,
kA8_MaskType,
kLCD_MaskType,
};
static sk_sp<SkFont> Make(sk_sp<SkTypeface>, SkScalar size, MaskType, uint32_t flags);
static sk_sp<SkFont> Make(sk_sp<SkTypeface>, SkScalar size, SkScalar scaleX, SkScalar skewX,
MaskType, uint32_t flags);
/**
* Return a font with the same attributes of this font, but with the specified size.
* If size is not supported (e.g. <= 0 or non-finite) NULL will be returned.
*/
sk_sp<SkFont> makeWithSize(SkScalar size) const;
SkTypeface* getTypeface() const { return fTypeface.get(); }
SkScalar getSize() const { return fSize; }
SkScalar getScaleX() const { return fScaleX; }
SkScalar getSkewX() const { return fSkewX; }
uint32_t getFlags() const { return fFlags; }
MaskType getMaskType() const { return (MaskType)fMaskType; }
bool isVertical() const { return SkToBool(fFlags & kVertical_Flag); }
bool isEmbolden() const { return SkToBool(fFlags & kEmbolden_Flag); }
bool isEnableAutoHints() const { return SkToBool(fFlags & kEnableAutoHints_Flag); }
bool isEnableByteCodeHints() const { return SkToBool(fFlags & kEnableByteCodeHints_Flag); }
bool isUseNonLinearMetrics() const { return SkToBool(fFlags & kUseNonlinearMetrics_Flag); }
int textToGlyphs(const void* text, size_t byteLength, SkTextEncoding,
uint16_t glyphs[], int maxGlyphCount) const;
SkScalar measureText(const void* text, size_t byteLength, SkTextEncoding) const;
static sk_sp<SkFont> Testing_CreateFromPaint(const SkPaint&);
private:
enum {
kAllFlags = 0xFF,
};
SkFont(sk_sp<SkTypeface>, SkScalar size, SkScalar scaleX, SkScalar skewX, MaskType,
uint32_t flags);
sk_sp<SkTypeface> fTypeface;
SkScalar fSize;
SkScalar fScaleX;
SkScalar fSkewX;
uint16_t fFlags;
uint8_t fMaskType;
// uint8_t fPad;
};
#endif
|
