1 /*
2 * Copyright (c) 2006, 2007, 2008, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "public/platform/Platform.h"
33
34 #include "SkTypeface.h"
35 #include "platform/LayoutTestSupport.h"
36 #include "platform/RuntimeEnabledFeatures.h"
37 #include "platform/fonts/FontPlatformData.h"
38 #include "platform/graphics/GraphicsContext.h"
39 #include "public/platform/linux/WebFontRenderStyle.h"
40 #include "public/platform/linux/WebSandboxSupport.h"
41
42 namespace blink {
43
44 static SkPaint::Hinting skiaHinting = SkPaint::kNormal_Hinting;
45 static bool useSkiaAutoHint = true;
46 static bool useSkiaBitmaps = true;
47 static bool useSkiaAntiAlias = true;
48 static bool useSkiaSubpixelRendering = false;
49
setHinting(SkPaint::Hinting hinting)50 void FontPlatformData::setHinting(SkPaint::Hinting hinting)
51 {
52 skiaHinting = hinting;
53 }
54
setAutoHint(bool useAutoHint)55 void FontPlatformData::setAutoHint(bool useAutoHint)
56 {
57 useSkiaAutoHint = useAutoHint;
58 }
59
setUseBitmaps(bool useBitmaps)60 void FontPlatformData::setUseBitmaps(bool useBitmaps)
61 {
62 useSkiaBitmaps = useBitmaps;
63 }
64
setAntiAlias(bool useAntiAlias)65 void FontPlatformData::setAntiAlias(bool useAntiAlias)
66 {
67 useSkiaAntiAlias = useAntiAlias;
68 }
69
setSubpixelRendering(bool useSubpixelRendering)70 void FontPlatformData::setSubpixelRendering(bool useSubpixelRendering)
71 {
72 useSkiaSubpixelRendering = useSubpixelRendering;
73 }
74
setupPaint(SkPaint * paint,GraphicsContext * context) const75 void FontPlatformData::setupPaint(SkPaint* paint, GraphicsContext* context)
76 const
77 {
78 paint->setAntiAlias(m_style.useAntiAlias);
79 paint->setHinting(static_cast<SkPaint::Hinting>(m_style.hintStyle));
80 paint->setEmbeddedBitmapText(m_style.useBitmaps);
81 paint->setAutohinted(m_style.useAutoHint);
82 if (m_style.useAntiAlias)
83 paint->setLCDRenderText(m_style.useSubpixelRendering);
84
85 // Do not enable subpixel text on low-dpi if full hinting is requested.
86 bool useSubpixelText = RuntimeEnabledFeatures::subpixelFontScalingEnabled()
87 && (paint->getHinting() != SkPaint::kFull_Hinting
88 || (context && context->deviceScaleFactor() > 1.0f));
89
90 // TestRunner specifically toggles the subpixel positioning flag.
91 if (useSubpixelText && !LayoutTestSupport::isRunningLayoutTest())
92 paint->setSubpixelText(true);
93 else
94 paint->setSubpixelText(m_style.useSubpixelPositioning);
95
96 const float ts = m_textSize >= 0 ? m_textSize : 12;
97 paint->setTextSize(SkFloatToScalar(ts));
98 paint->setTypeface(m_typeface.get());
99 paint->setFakeBoldText(m_syntheticBold);
100 paint->setTextSkewX(m_syntheticItalic ? -SK_Scalar1 / 4 : 0);
101 }
102
querySystemForRenderStyle(bool useSkiaSubpixelPositioning)103 void FontPlatformData::querySystemForRenderStyle(bool useSkiaSubpixelPositioning)
104 {
105 WebFontRenderStyle style;
106 #if OS(ANDROID)
107 style.setDefaults();
108 #else
109 // If the font name is missing (i.e. probably a web font) or the sandbox is disabled, use the system defaults.
110 if (!m_family.length() || !Platform::current()->sandboxSupport()) {
111 style.setDefaults();
112 } else {
113 const int sizeAndStyle = (((int)m_textSize) << 2) | (m_typeface->style() & 3);
114 Platform::current()->sandboxSupport()->getRenderStyleForStrike(m_family.data(), sizeAndStyle, &style);
115 }
116 #endif
117 style.toFontRenderStyle(&m_style);
118
119 // Fix FontRenderStyle::NoPreference to actual styles.
120 if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
121 m_style.useAntiAlias = useSkiaAntiAlias;
122
123 if (!m_style.useHinting)
124 m_style.hintStyle = SkPaint::kNo_Hinting;
125 else if (m_style.useHinting == FontRenderStyle::NoPreference)
126 m_style.hintStyle = skiaHinting;
127
128 if (m_style.useBitmaps == FontRenderStyle::NoPreference)
129 m_style.useBitmaps = useSkiaBitmaps;
130 if (m_style.useAutoHint == FontRenderStyle::NoPreference)
131 m_style.useAutoHint = useSkiaAutoHint;
132 if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
133 m_style.useAntiAlias = useSkiaAntiAlias;
134 if (m_style.useSubpixelRendering == FontRenderStyle::NoPreference)
135 m_style.useSubpixelRendering = useSkiaSubpixelRendering;
136
137 // TestRunner specifically toggles the subpixel positioning flag.
138 if (m_style.useSubpixelPositioning == FontRenderStyle::NoPreference
139 || LayoutTestSupport::isRunningLayoutTest())
140 m_style.useSubpixelPositioning = useSkiaSubpixelPositioning;
141 }
142
defaultUseSubpixelPositioning()143 bool FontPlatformData::defaultUseSubpixelPositioning()
144 {
145 return FontDescription::subpixelPositioning();
146 }
147
148 } // namespace blink
149