content/renderer/render_view_linux.cc

   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/Source/WebKit/chromium/public/linux/WebFontRendering.h"
   9
  10 using WebKit::WebFontRendering;
  11
  12 namespace content {
  13
  14 static SkPaint::Hinting RendererPreferencesToSkiaHinting(
  15     const RendererPreferences& prefs) {
  16   if (!prefs.should_antialias_text) {
  17     // When anti-aliasing is off, GTK maps all non-zero hinting settings to
  18     // 'Normal' hinting so we do the same. Otherwise, folks who have 'Slight'
  19     // hinting selected will see readable text in everything expect Chromium.
  20     switch (prefs.hinting) {
  21       case RENDERER_PREFERENCES_HINTING_NONE:
  22         return SkPaint::kNo_Hinting;
  23       case RENDERER_PREFERENCES_HINTING_SYSTEM_DEFAULT:
  24       case RENDERER_PREFERENCES_HINTING_SLIGHT:
  25       case RENDERER_PREFERENCES_HINTING_MEDIUM:
  26       case RENDERER_PREFERENCES_HINTING_FULL:
  27         return SkPaint::kNormal_Hinting;
  28       default:
  29         NOTREACHED();
  30         return SkPaint::kNormal_Hinting;
  31     }
  32   }
  33
  34   switch (prefs.hinting) {
  35   case RENDERER_PREFERENCES_HINTING_SYSTEM_DEFAULT:
  36     return SkPaint::kNormal_Hinting;
  37   case RENDERER_PREFERENCES_HINTING_NONE:
  38     return SkPaint::kNo_Hinting;
  39   case RENDERER_PREFERENCES_HINTING_SLIGHT:
  40     return SkPaint::kSlight_Hinting;
  41   case RENDERER_PREFERENCES_HINTING_MEDIUM:
  42     return SkPaint::kNormal_Hinting;
  43   case RENDERER_PREFERENCES_HINTING_FULL:
  44     return SkPaint::kFull_Hinting;
  45   default:
  46     NOTREACHED();
  47     return SkPaint::kNormal_Hinting;
  48   }
  49 }
  50
  51 static SkFontHost::LCDOrder RendererPreferencesToSkiaLCDOrder(
  52     RendererPreferencesSubpixelRenderingEnum subpixel) {
  53   switch (subpixel) {
  54   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_SYSTEM_DEFAULT:
  55   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_NONE:
  56   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_RGB:
  57   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_VRGB:
  58     return SkFontHost::kRGB_LCDOrder;
  59   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_BGR:
  60   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_VBGR:
  61     return SkFontHost::kBGR_LCDOrder;
  62   default:
  63     NOTREACHED();
  64     return SkFontHost::kRGB_LCDOrder;
  65   }
  66 }
  67
  68 static SkFontHost::LCDOrientation
  69     RendererPreferencesToSkiaLCDOrientation(
  70         RendererPreferencesSubpixelRenderingEnum subpixel) {
  71   switch (subpixel) {
  72   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_SYSTEM_DEFAULT:
  73   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_NONE:
  74   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_RGB:
  75   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_BGR:
  76     return SkFontHost::kHorizontal_LCDOrientation;
  77   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_VRGB:
  78   case RENDERER_PREFERENCES_SUBPIXEL_RENDERING_VBGR:
  79     return SkFontHost::kVertical_LCDOrientation;
  80   default:
  81     NOTREACHED();
  82     return SkFontHost::kHorizontal_LCDOrientation;
  83   }
  84 }
  85
  86 static bool RendererPreferencesToAntiAliasFlag(
  87     const RendererPreferences& prefs) {
  88   return prefs.should_antialias_text;
  89 }
  90
  91 static bool RendererPreferencesToSubpixelRenderingFlag(
  92     const RendererPreferences& prefs) {
  93   if (prefs.subpixel_rendering !=
  94         RENDERER_PREFERENCES_SUBPIXEL_RENDERING_SYSTEM_DEFAULT &&
  95       prefs.subpixel_rendering !=
  96         RENDERER_PREFERENCES_SUBPIXEL_RENDERING_NONE) {
  97     return true;
  98   }
  99   return false;
 100 }
 101
 102 void RenderViewImpl::UpdateFontRenderingFromRendererPrefs() {
 103   const RendererPreferences& prefs = renderer_preferences_;
 104   WebFontRendering::setHinting(RendererPreferencesToSkiaHinting(prefs));
 105   WebFontRendering::setAutoHint(prefs.use_autohinter);
 106   WebFontRendering::setUseBitmaps(prefs.use_bitmaps);
 107   WebFontRendering::setLCDOrder(
 108       RendererPreferencesToSkiaLCDOrder(prefs.subpixel_rendering));
 109   WebFontRendering::setLCDOrientation(
 110       RendererPreferencesToSkiaLCDOrientation(prefs.subpixel_rendering));
 111   WebFontRendering::setAntiAlias(RendererPreferencesToAntiAliasFlag(prefs));
 112   WebFontRendering::setSubpixelRendering(
 113       RendererPreferencesToSubpixelRenderingFlag(prefs));
 114   WebFontRendering::setSubpixelPositioning(prefs.use_subpixel_positioning);
 115 }
 116
 117 }  // namespace content