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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkString.h"
#include "SkTypeface.h"
#include "SkTypes.h"
static const char* gFaces[] = {
"Times Roman",
"Hiragino Maru Gothic Pro",
"Papyrus",
"Helvetica",
"Courier New"
};
class TypefaceGM : public skiagm::GM {
public:
TypefaceGM() {
fFaces = new SkTypeface*[SK_ARRAY_COUNT(gFaces)];
for (size_t i = 0; i < SK_ARRAY_COUNT(gFaces); i++) {
fFaces[i] = SkTypeface::CreateFromName(gFaces[i], SkTypeface::kNormal);
}
}
virtual ~TypefaceGM() {
for (size_t i = 0; i < SK_ARRAY_COUNT(gFaces); i++) {
SkSafeUnref(fFaces[i]);
}
delete [] fFaces;
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("typeface");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(640, 480);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkString text("Typefaces are fun!");
SkScalar y = 0;
SkPaint paint;
paint.setAntiAlias(true);
for (int i = 0; i < (int)SK_ARRAY_COUNT(gFaces); i++) {
this->drawWithFace(text, i, y, paint, canvas);
}
// Now go backwards
for (int i = SK_ARRAY_COUNT(gFaces) - 1; i >= 0; i--) {
this->drawWithFace(text, i, y, paint, canvas);
}
}
private:
void drawWithFace(const SkString& text, int i, SkScalar& y, SkPaint& paint,
SkCanvas* canvas) {
paint.setTypeface(fFaces[i]);
y += paint.getFontMetrics(NULL);
canvas->drawText(text.c_str(), text.size(), 0, y, paint);
}
SkTypeface** fFaces;
typedef skiagm::GM INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static void getGlyphPositions(const SkPaint& paint, const uint16_t glyphs[],
int count, SkScalar x, SkScalar y, SkPoint pos[]) {
SkASSERT(SkPaint::kGlyphID_TextEncoding == paint.getTextEncoding());
SkAutoSTMalloc<128, SkScalar> widthStorage(count);
SkScalar* widths = widthStorage.get();
paint.getTextWidths(glyphs, count * sizeof(uint16_t), widths);
for (int i = 0; i < count; ++i) {
pos[i].set(x, y);
x += widths[i];
}
}
static void applyKerning(SkPoint pos[], const int32_t adjustments[], int count,
const SkPaint& paint) {
SkScalar scale = paint.getTextSize() / paint.getTypeface()->getUnitsPerEm();
SkScalar globalAdj = 0;
for (int i = 0; i < count - 1; ++i) {
globalAdj += adjustments[i] * scale;
pos[i + 1].fX += globalAdj;
}
}
static void drawKernText(SkCanvas* canvas, const void* text, size_t len,
SkScalar x, SkScalar y, const SkPaint& paint) {
SkTypeface* face = paint.getTypeface();
if (!face) {
canvas->drawText(text, len, x, y, paint);
return;
}
SkAutoSTMalloc<128, uint16_t> glyphStorage(len);
uint16_t* glyphs = glyphStorage.get();
int glyphCount = paint.textToGlyphs(text, len, glyphs);
if (glyphCount < 1) {
return;
}
SkAutoSTMalloc<128, int32_t> adjustmentStorage(glyphCount - 1);
int32_t* adjustments = adjustmentStorage.get();
if (!face->getKerningPairAdjustments(glyphs, glyphCount, adjustments)) {
canvas->drawText(text, len, x, y, paint);
return;
}
SkPaint glyphPaint(paint);
glyphPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
SkAutoSTMalloc<128, SkPoint> posStorage(glyphCount);
SkPoint* pos = posStorage.get();
getGlyphPositions(glyphPaint, glyphs, glyphCount, x, y, pos);
applyKerning(pos, adjustments, glyphCount, glyphPaint);
canvas->drawPosText(glyphs, glyphCount * sizeof(uint16_t), pos, glyphPaint);
}
static const struct {
const char* fName;
SkTypeface::Style fStyle;
} gFaceStyles[] = {
{ "sans-serif", SkTypeface::kNormal },
{ "sans-serif", SkTypeface::kBold },
{ "sans-serif", SkTypeface::kItalic },
{ "sans-serif", SkTypeface::kBoldItalic },
{ "serif", SkTypeface::kNormal },
{ "serif", SkTypeface::kBold },
{ "serif", SkTypeface::kItalic },
{ "serif", SkTypeface::kBoldItalic },
{ "monospace", SkTypeface::kNormal },
{ "monospace", SkTypeface::kBold },
{ "monospace", SkTypeface::kItalic },
{ "monospace", SkTypeface::kBoldItalic },
};
static const int gFaceStylesCount = SK_ARRAY_COUNT(gFaceStyles);
class TypefaceStylesGM : public skiagm::GM {
SkTypeface* fFaces[gFaceStylesCount];
bool fApplyKerning;
public:
TypefaceStylesGM(bool applyKerning) : fApplyKerning(applyKerning) {
for (int i = 0; i < gFaceStylesCount; i++) {
fFaces[i] = SkTypeface::CreateFromName(gFaceStyles[i].fName,
gFaceStyles[i].fStyle);
}
}
virtual ~TypefaceStylesGM() {
for (int i = 0; i < gFaceStylesCount; i++) {
SkSafeUnref(fFaces[i]);
}
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
SkString name("typefacestyles");
if (fApplyKerning) {
name.append("_kerning");
}
return name;
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(640, 480);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(SkIntToScalar(30));
const char* text = fApplyKerning ? "Type AWAY" : "Hamburgefons";
const size_t textLen = strlen(text);
SkScalar x = SkIntToScalar(10);
SkScalar dy = paint.getFontMetrics(NULL);
SkScalar y = dy;
if (fApplyKerning) {
paint.setSubpixelText(true);
} else {
paint.setLinearText(true);
}
for (int i = 0; i < gFaceStylesCount; i++) {
paint.setTypeface(fFaces[i]);
canvas->drawText(text, textLen, x, y, paint);
if (fApplyKerning) {
drawKernText(canvas, text, textLen, x + 240, y, paint);
}
y += dy;
}
}
private:
typedef skiagm::GM INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
DEF_GM( return new TypefaceGM; )
DEF_GM( return new TypefaceStylesGM(false); )
DEF_GM( return new TypefaceStylesGM(true); )
|
