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
|
/*
* Copyright (C) 2012 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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 "CompositorHUDFontAtlas.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "GraphicsContext.h"
#include "PlatformContextSkia.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "TextRun.h"
#include "skia/ext/platform_canvas.h"
using WebKit::WebRect;
namespace WebCore {
#define ATLAS_SIZE 128
static void wrapPositionIfNeeded(IntPoint& position, int textWidth, int textHeight)
{
if (position.x() + textWidth > ATLAS_SIZE)
position = IntPoint(0, position.y() + textHeight);
}
// Paints the font into the atlas, from left-to-right, top-to-bottom, starting at
// startingPosition. At the same time, it updates the ascii-to-WebRect mapping for
// each character. By doing things this way, it is possible to support variable-width
// fonts and multiple fonts on the same atlas.
SkBitmap CompositorHUDFontAtlas::generateFontAtlas(WebRect asciiToRectTable[128], int& fontHeight)
{
fontHeight = 14;
OwnPtr<SkCanvas> canvas = adoptPtr(skia::CreateBitmapCanvas(ATLAS_SIZE, ATLAS_SIZE, false /* opaque */));
PlatformContextSkia platformContext(canvas.get());
platformContext.setDrawingToImageBuffer(true);
GraphicsContext atlasContext(&platformContext);
// Clear the entire texture atlas to transparent before drawing fonts.
atlasContext.setFillColor(Color(0, 0, 0, 0), ColorSpaceDeviceRGB);
atlasContext.fillRect(FloatRect(0, 0, ATLAS_SIZE, ATLAS_SIZE));
// FIXME: monospace font does not work as expected.
FontDescription fontDescription;
fontDescription.setGenericFamily(FontDescription::MonospaceFamily);
fontDescription.setComputedSize(fontHeight);
FontCachePurgePreventer fontCachePurgePreventer;
int textHeight = fontDescription.computedPixelSize();
IntPoint position(0, textHeight);
// This is a dirty little trick to account for overhang letters like g, p, j.
int inflation = textHeight / 3;
Font font(fontDescription, 0, 0);
font.update(0);
Color fontColor(255, 0, 0);
atlasContext.setStrokeColor(fontColor, ColorSpaceDeviceRGB);
atlasContext.setFillColor(fontColor, ColorSpaceDeviceRGB);
// First, draw a generic rect that will be used for special and unknown characters that have nothing else to render.
{
int textWidth = textHeight / 2;
wrapPositionIfNeeded(position, textWidth, textHeight + inflation);
atlasContext.strokeRect(FloatRect(FloatPoint(position.x() + 1, position.y() - textHeight + 1 + inflation), FloatSize(textWidth - 2, textHeight - 2 - inflation)), 1);
// Initialize the rect that would be copied when drawing this glyph from the atlas.
asciiToRectTable[0] = WebRect(position.x(), position.y() - textHeight, textWidth, textHeight + inflation);
// Increment to the position where the next glyph will be placed.
position.setX(position.x() + textWidth);
}
// Then, draw the ASCII characters.
for (LChar i = 1; i < 128; ++i) {
if (i < 32) {
// Special characters will simply use the the default glyph.
asciiToRectTable[i] = asciiToRectTable[0];
continue;
}
String str;
str.append(i);
TextRun text(str);
int textWidth = round(font.width(text));
wrapPositionIfNeeded(position, textWidth, textHeight + inflation);
atlasContext.drawText(font, text, position);
// Initialize the rect that would be copied when drawing this glyph from the atlas.
asciiToRectTable[i] = WebRect(position.x(), position.y() - textHeight, textWidth, textHeight + inflation);
// Increment to the position where the next glyph will be placed.
position.setX(position.x() + textWidth);
}
SkBitmap copy;
const SkBitmap& source = canvas->getDevice()->accessBitmap(false);
source.copyTo(©, source.config());
return copy;
}
} // namespace WebCore
|
