gfx/2d/DWriteSettings.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
   6
   7 #include "DWriteSettings.h"
   8
   9 #include "mozilla/DataMutex.h"
  10 #include "mozilla/gfx/2D.h"
  11 #include "mozilla/gfx/Logging.h"
  12 #include "mozilla/gfx/gfxVars.h"
  13
  14 using namespace mozilla;
  15 using namespace mozilla::gfx;
  16
  17 static std::atomic<Float> sClearTypeLevel{1.0f};
  18 static std::atomic<Float> sEnhancedContrast{1.0f};
  19 static std::atomic<Float> sGamma{2.2f};
  20 static Atomic<DWRITE_PIXEL_GEOMETRY> sPixelGeometry;
  21 static Atomic<DWRITE_RENDERING_MODE> sRenderingMode;
  22 static Atomic<DWRITE_MEASURING_MODE> sMeasuringMode;
  23 static std::atomic<Float> sGDIGamma{1.4f};
  24 StaticDataMutex<StaticRefPtr<IDWriteRenderingParams>> sStandardRenderingParams(
  25     "StandardRenderingParams");
  26 StaticDataMutex<StaticRefPtr<IDWriteRenderingParams>> sGDIRenderingParams(
  27     "GDIRenderingParams");
  28
  29 static void ClearStandardRenderingParams() {
  30   auto lockedParams = sStandardRenderingParams.Lock();
  31   lockedParams.ref() = nullptr;
  32 }
  33
  34 static void ClearGDIRenderingParams() {
  35   auto lockedParams = sGDIRenderingParams.Lock();
  36   lockedParams.ref() = nullptr;
  37 }
  38
  39 static void UpdateClearTypeLevel() {
  40   sClearTypeLevel = gfxVars::SystemTextClearTypeLevel();
  41 }
  42 static void ClearTypeLevelVarUpdated() {
  43   UpdateClearTypeLevel();
  44   ClearStandardRenderingParams();
  45   ClearGDIRenderingParams();
  46 }
  47
  48 static void UpdateEnhancedContrast() {
  49   sEnhancedContrast = gfxVars::SystemTextEnhancedContrast();
  50 }
  51 static void EnhancedContrastVarUpdated() {
  52   UpdateEnhancedContrast();
  53   ClearStandardRenderingParams();
  54 }
  55
  56 static void UpdateGamma() { sGamma = gfxVars::SystemTextGamma(); }
  57 static void GammaVarUpdated() {
  58   UpdateGamma();
  59   ClearStandardRenderingParams();
  60 }
  61
  62 static void UpdateGDIGamma() { sGDIGamma = gfxVars::SystemGDIGamma(); }
  63 static void GDIGammaVarUpdated() {
  64   UpdateGDIGamma();
  65   ClearGDIRenderingParams();
  66 }
  67
  68 static void UpdatePixelGeometry() {
  69   sPixelGeometry =
  70       static_cast<DWRITE_PIXEL_GEOMETRY>(gfxVars::SystemTextPixelGeometry());
  71   Factory::SetBGRSubpixelOrder(sPixelGeometry == DWRITE_PIXEL_GEOMETRY_BGR);
  72 }
  73 static void PixelGeometryVarUpdated() {
  74   UpdatePixelGeometry();
  75   ClearStandardRenderingParams();
  76   ClearGDIRenderingParams();
  77 }
  78
  79 static void UpdateRenderingMode() {
  80   sRenderingMode =
  81       static_cast<DWRITE_RENDERING_MODE>(gfxVars::SystemTextRenderingMode());
  82   switch (sRenderingMode) {
  83     case DWRITE_RENDERING_MODE_ALIASED:
  84     case DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC:
  85       sMeasuringMode = DWRITE_MEASURING_MODE_GDI_CLASSIC;
  86       break;
  87     case DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL:
  88       sMeasuringMode = DWRITE_MEASURING_MODE_GDI_NATURAL;
  89       break;
  90     default:
  91       sMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
  92       break;
  93   }
  94 }
  95 static void RenderingModeVarUpdated() {
  96   UpdateRenderingMode();
  97   ClearStandardRenderingParams();
  98 }
  99
 100 DWriteSettings::DWriteSettings(bool aUseGDISettings)
 101     : mUseGDISettings(aUseGDISettings) {}
 102
 103 /* static */
 104 void DWriteSettings::Initialize() {
 105   UpdateClearTypeLevel();
 106   gfxVars::SetSystemTextClearTypeLevelListener(ClearTypeLevelVarUpdated);
 107
 108   UpdateEnhancedContrast();
 109   gfxVars::SetSystemTextEnhancedContrastListener(EnhancedContrastVarUpdated);
 110
 111   UpdateGamma();
 112   gfxVars::SetSystemTextGammaListener(GammaVarUpdated);
 113
 114   UpdateGDIGamma();
 115   gfxVars::SetSystemGDIGammaListener(GDIGammaVarUpdated);
 116
 117   UpdateRenderingMode();
 118   gfxVars::SetSystemTextRenderingModeListener(RenderingModeVarUpdated);
 119
 120   UpdatePixelGeometry();
 121   gfxVars::SetSystemTextPixelGeometryListener(PixelGeometryVarUpdated);
 122 }
 123
 124 /* static */
 125 DWriteSettings& DWriteSettings::Get(bool aGDISettings) {
 126   DWriteSettings* settings;
 127   if (aGDISettings) {
 128     static DWriteSettings* sGDISettings =
 129         new DWriteSettings(/* aUseGDISettings */ true);
 130     settings = sGDISettings;
 131   } else {
 132     static DWriteSettings* sStandardSettings =
 133         new DWriteSettings(/* aUseGDISettings */ false);
 134     settings = sStandardSettings;
 135   }
 136   return *settings;
 137 }
 138
 139 Float DWriteSettings::ClearTypeLevel() { return sClearTypeLevel; }
 140
 141 Float DWriteSettings::EnhancedContrast() {
 142   return mUseGDISettings ? 0.0f : sEnhancedContrast.load();
 143 }
 144
 145 Float DWriteSettings::Gamma() { return mUseGDISettings ? sGDIGamma : sGamma; }
 146
 147 DWRITE_PIXEL_GEOMETRY DWriteSettings::PixelGeometry() { return sPixelGeometry; }
 148
 149 DWRITE_RENDERING_MODE DWriteSettings::RenderingMode() {
 150   return mUseGDISettings ? DWRITE_RENDERING_MODE_GDI_CLASSIC : sRenderingMode;
 151 }
 152
 153 DWRITE_MEASURING_MODE DWriteSettings::MeasuringMode() {
 154   return mUseGDISettings ? DWRITE_MEASURING_MODE_GDI_CLASSIC : sMeasuringMode;
 155 }
 156
 157 already_AddRefed<IDWriteRenderingParams> DWriteSettings::RenderingParams() {
 158   auto lockedParams = mUseGDISettings ? sGDIRenderingParams.Lock()
 159                                       : sStandardRenderingParams.Lock();
 160   if (!lockedParams.ref()) {
 161     RefPtr<IDWriteRenderingParams> params;
 162     HRESULT hr = Factory::GetDWriteFactory()->CreateCustomRenderingParams(
 163         Gamma(), EnhancedContrast(), ClearTypeLevel(), PixelGeometry(),
 164         RenderingMode(), getter_AddRefs(params));
 165     if (SUCCEEDED(hr)) {
 166       lockedParams.ref() = params.forget();
 167     } else {
 168       gfxWarning() << "Failed to create DWrite custom rendering params.";
 169     }
 170   }
 171
 172   return do_AddRef(lockedParams.ref());
 173 }