render_view_linux.cc revision 5f1c94371a64b3196d4be9466099bb892df9b88e 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "content/renderer/render_view_impl.h"
6
7#include "content/public/common/renderer_preferences.h"
8#include "third_party/WebKit/public/web/linux/WebFontRendering.h"
9
10using blink::WebFontRendering;
11
12namespace content {
13
14namespace {
15
16SkPaint::Hinting RendererPreferencesToSkiaHinting(
17    const RendererPreferences& prefs) {
18  if (!prefs.should_antialias_text) {
19    // When anti-aliasing is off, GTK maps all non-zero hinting settings to
20    // 'Normal' hinting so we do the same. Otherwise, folks who have 'Slight'
21    // hinting selected will see readable text in everything expect Chromium.
22    switch (prefs.hinting) {
23      case gfx::FontRenderParams::HINTING_NONE:
24        return SkPaint::kNo_Hinting;
25      case gfx::FontRenderParams::HINTING_SLIGHT:
26      case gfx::FontRenderParams::HINTING_MEDIUM:
27      case gfx::FontRenderParams::HINTING_FULL:
28        return SkPaint::kNormal_Hinting;
29      default:
30        NOTREACHED();
31        return SkPaint::kNormal_Hinting;
32    }
33  }
34
35  switch (prefs.hinting) {
36    case gfx::FontRenderParams::HINTING_NONE:   return SkPaint::kNo_Hinting;
37    case gfx::FontRenderParams::HINTING_SLIGHT: return SkPaint::kSlight_Hinting;
38    case gfx::FontRenderParams::HINTING_MEDIUM: return SkPaint::kNormal_Hinting;
39    case gfx::FontRenderParams::HINTING_FULL:   return SkPaint::kFull_Hinting;
40    default:
41      NOTREACHED();
42      return SkPaint::kNormal_Hinting;
43    }
44}
45
46SkFontHost::LCDOrder RendererPreferencesToSkiaLCDOrder(
47    const RendererPreferences& prefs) {
48  switch (prefs.subpixel_rendering) {
49    case gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE:
50    case gfx::FontRenderParams::SUBPIXEL_RENDERING_RGB:
51    case gfx::FontRenderParams::SUBPIXEL_RENDERING_VRGB:
52      return SkFontHost::kRGB_LCDOrder;
53    case gfx::FontRenderParams::SUBPIXEL_RENDERING_BGR:
54    case gfx::FontRenderParams::SUBPIXEL_RENDERING_VBGR:
55      return SkFontHost::kBGR_LCDOrder;
56    default:
57      NOTREACHED();
58      return SkFontHost::kRGB_LCDOrder;
59  }
60}
61
62SkFontHost::LCDOrientation RendererPreferencesToSkiaLCDOrientation(
63    const RendererPreferences& prefs) {
64  switch (prefs.subpixel_rendering) {
65    case gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE:
66    case gfx::FontRenderParams::SUBPIXEL_RENDERING_RGB:
67    case gfx::FontRenderParams::SUBPIXEL_RENDERING_BGR:
68      return SkFontHost::kHorizontal_LCDOrientation;
69    case gfx::FontRenderParams::SUBPIXEL_RENDERING_VRGB:
70    case gfx::FontRenderParams::SUBPIXEL_RENDERING_VBGR:
71      return SkFontHost::kVertical_LCDOrientation;
72    default:
73      NOTREACHED();
74      return SkFontHost::kHorizontal_LCDOrientation;
75  }
76}
77
78}  // namespace
79
80void RenderViewImpl::UpdateFontRenderingFromRendererPrefs() {
81  const RendererPreferences& prefs = renderer_preferences_;
82  WebFontRendering::setHinting(RendererPreferencesToSkiaHinting(prefs));
83  WebFontRendering::setAutoHint(prefs.use_autohinter);
84  WebFontRendering::setUseBitmaps(prefs.use_bitmaps);
85  WebFontRendering::setLCDOrder(RendererPreferencesToSkiaLCDOrder(prefs));
86  WebFontRendering::setLCDOrientation(
87      RendererPreferencesToSkiaLCDOrientation(prefs));
88  WebFontRendering::setAntiAlias(prefs.should_antialias_text);
89  WebFontRendering::setSubpixelRendering(
90      prefs.subpixel_rendering !=
91      gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE);
92  WebFontRendering::setSubpixelPositioning(prefs.use_subpixel_positioning);
93}
94
95}  // namespace content
96