1 /*
2 * Copyright (C) 2006, 2007 Apple Computer, Inc.
3 * Copyright (c) 2006, 2007, 2008, 2009, 2012 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 * * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <windows.h>
33
34 #include "third_party/blink/renderer/platform/fonts/font_cache.h"
35 #include "third_party/blink/renderer/platform/fonts/font_platform_data.h"
36 #include "third_party/blink/renderer/platform/web_test_support.h"
37 #include "third_party/skia/include/core/SkFont.h"
38 #include "third_party/skia/include/core/SkTypeface.h"
39
40 namespace blink {
41
SetupSkFont(SkFont * font,float,const Font *) const42 void FontPlatformData::SetupSkFont(SkFont* font, float, const Font*) const {
43 font->setSize(SkFloatToScalar(text_size_));
44 font->setTypeface(typeface_);
45 font->setEmbolden(synthetic_bold_);
46 font->setSkewX(synthetic_italic_ ? -SK_Scalar1 / 4 : 0);
47
48 uint32_t font_flags = FontFlags();
49 if (font_flags & kSubpixelsAntiAlias) {
50 font->setEdging(SkFont::Edging::kSubpixelAntiAlias);
51 } else if (font_flags & kAntiAlias) {
52 font->setEdging(SkFont::Edging::kAntiAlias);
53 } else {
54 font->setEdging(SkFont::Edging::kAlias);
55 }
56
57 // Only use sub-pixel positioning if anti aliasing is enabled. Otherwise,
58 // without font smoothing, subpixel text positioning leads to uneven spacing
59 // since subpixel test placement coordinates would be passed to Skia, which
60 // only has non-antialiased glyphs to draw, so they necessarily get clamped at
61 // pixel positions, which leads to uneven spacing, either too close or too far
62 // away from adjacent glyphs. We avoid this by linking the two flags.
63 if (font_flags & kAntiAlias)
64 font->setSubpixel(true);
65
66 if (WebTestSupport::IsRunningWebTest() &&
67 !WebTestSupport::IsTextSubpixelPositioningAllowedForTest())
68 font->setSubpixel(false);
69
70 font->setEmbeddedBitmaps(!avoid_embedded_bitmaps_);
71 }
72
ComputeFontFlags(String font_family_name)73 static int ComputeFontFlags(String font_family_name) {
74 if (WebTestSupport::IsRunningWebTest())
75 return WebTestSupport::IsFontAntialiasingEnabledForTest()
76 ? FontPlatformData::kAntiAlias
77 : 0;
78
79 int font_flags = 0;
80 if (FontCache::GetFontCache()->AntialiasedTextEnabled()) {
81 int lcd_flag = FontCache::GetFontCache()->LcdTextEnabled()
82 ? FontPlatformData::kSubpixelsAntiAlias
83 : 0;
84 font_flags = FontPlatformData::kAntiAlias | lcd_flag;
85 }
86
87 return font_flags;
88 }
89
QuerySystemForRenderStyle()90 void FontPlatformData::QuerySystemForRenderStyle() {
91 font_flags_ = ComputeFontFlags(FontFamilyName());
92 }
93
94 } // namespace blink
95