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/public/web/linux/WebFontRendering.h"
   9
  10 using blink::WebFontRendering;
  11
  12 namespace content {
  13
  14 namespace {
  15
  16 SkPaint::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
  46 SkFontHost::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
  62 SkFontHost::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
  80 void 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