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
|
/*
* Copyright 2009, The Android Open Source Project
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Font.h"
#include "FontData.h"
#include "FontFallbackList.h"
#include "GraphicsContext.h"
#include "GlyphBuffer.h"
#include "PlatformGraphicsContext.h"
#include "IntRect.h"
#include "SkCanvas.h"
#include "SkLayerDrawLooper.h"
#include "SkPaint.h"
#include "SkTemplates.h"
#include "SkTypeface.h"
#include "SkUtils.h"
namespace WebCore {
static void updateForFont(SkPaint* paint, const SimpleFontData* font) {
font->platformData().setupPaint(paint);
paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
}
static SkPaint* setupFill(SkPaint* paint, GraphicsContext* gc,
const SimpleFontData* font) {
gc->setupFillPaint(paint);
updateForFont(paint, font);
return paint;
}
static SkPaint* setupStroke(SkPaint* paint, GraphicsContext* gc,
const SimpleFontData* font) {
gc->setupStrokePaint(paint);
updateForFont(paint, font);
return paint;
}
static bool setupForText(SkPaint* paint, GraphicsContext* gc,
const SimpleFontData* font) {
int mode = gc->textDrawingMode();
if ((mode & (cTextFill | cTextStroke)) == (cTextFill | cTextStroke)) {
SkLayerDrawLooper* looper = new SkLayerDrawLooper;
paint->setLooper(looper)->unref();
// we clear the looper, in case we have a shadow
SkPaint* fillP = NULL;
SkPaint* strokeP = NULL;
if (gc->willStroke()) {
strokeP = setupStroke(looper->addLayer(), gc, font);
strokeP->setLooper(NULL);
}
if (gc->willFill()) {
fillP = setupFill(looper->addLayer(), gc, font);
fillP->setLooper(NULL);
}
SkPaint shadowPaint;
SkPoint offset;
if (gc->setupShadowPaint(&shadowPaint, &offset)) {
SkPaint* p = looper->addLayer(offset.fX, offset.fY);
*p = shadowPaint;
if (strokeP && !fillP) {
// stroke the shadow if we have stroke but no fill
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeWidth(strokeP->getStrokeWidth());
}
updateForFont(p, font);
}
} else if (mode & cTextFill) {
(void)setupFill(paint, gc, font);
} else if (mode & cTextStroke) {
(void)setupStroke(paint, gc, font);
} else {
return false;
}
return true;
}
void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
const GlyphBuffer& glyphBuffer, int from, int numGlyphs,
const FloatPoint& point) const {
SkASSERT(sizeof(GlyphBufferGlyph) == sizeof(uint16_t)); // compile-time assert
SkPaint paint;
if (!setupForText(&paint, gc, font)) {
return;
}
SkScalar x = SkFloatToScalar(point.x());
SkScalar y = SkFloatToScalar(point.y());
const GlyphBufferGlyph* glyphs = glyphBuffer.glyphs(from);
const GlyphBufferAdvance* adv = glyphBuffer.advances(from);
SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
SkPoint* pos = storage.get();
/* We need an array of [x,y,x,y,x,y,...], but webkit is giving us
point.xy + [width, height, width, height, ...], so we have to convert
*/
for (int i = 0; i < numGlyphs; i++) {
pos[i].set(x, y);
x += SkFloatToScalar(adv[i].width());
y += SkFloatToScalar(adv[i].height());
}
SkCanvas* canvas = gc->platformContext()->mCanvas;
canvas->drawPosText(glyphs, numGlyphs * sizeof(*glyphs), pos, paint);
}
FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& point, int h, int, int) const
{
SkPaint paint;
SkScalar width, left;
SkPaint::FontMetrics metrics;
primaryFont()->platformData().setupPaint(&paint);
width = paint.measureText(run.characters(), run.length() << 1);
SkScalar spacing = paint.getFontMetrics(&metrics);
return FloatRect(point.x(),
point.y() - floorf(SkScalarToFloat(-metrics.fAscent)),
roundf(SkScalarToFloat(width)),
roundf(SkScalarToFloat(spacing)));
}
void Font::drawComplexText(GraphicsContext* gc, TextRun const& run, FloatPoint const& point, int, int) const
{
SkCanvas* canvas = gc->platformContext()->mCanvas;
SkPaint paint;
if (!setupForText(&paint, gc, primaryFont())) {
return;
}
canvas->drawText(run.characters(), run.length() << 1,
SkFloatToScalar(point.x()), SkFloatToScalar(point.y()),
paint);
}
float Font::floatWidthForComplexText(const TextRun& run) const
{
SkPaint paint;
primaryFont()->platformData().setupPaint(&paint);
//printf("--------- complext measure %d chars\n", run.to() - run.from());
SkScalar width = paint.measureText(run.characters(), run.length() << 1);
return SkScalarToFloat(width);
}
int Font::offsetForPositionForComplexText(const TextRun& run, int x, bool includePartialGlyphs) const
{
SkPaint paint;
int count = run.length();
SkAutoSTMalloc<64, SkScalar> storage(count);
SkScalar* widths = storage.get();
primaryFont()->platformData().setupPaint(&paint);
count = paint.getTextWidths(run.characters(), count << 1, widths);
if (count > 0)
{
SkScalar pos = 0;
for (int i = 0; i < count; i++)
{
if (x < SkScalarRound(pos + SkScalarHalf(widths[i])))
return i;
pos += widths[i];
}
}
return count;
}
}
|
