1 files changed, 173 insertions, 0 deletions
diff --git a/gfx/2d/DWriteSettings.cpp b/gfx/2d/DWriteSettings.cpp
new file mode 100644
index 0000000000..acd26b4e5b
--- /dev/null
+++ b/gfx/2d/DWriteSettings.cpp
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "DWriteSettings.h"
+
+#include "mozilla/DataMutex.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/gfx/gfxVars.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+static std::atomic<Float> sClearTypeLevel{1.0f};
+static std::atomic<Float> sEnhancedContrast{1.0f};
+static std::atomic<Float> sGamma{2.2f};
+static Atomic<DWRITE_PIXEL_GEOMETRY> sPixelGeometry;
+static Atomic<DWRITE_RENDERING_MODE> sRenderingMode;
+static Atomic<DWRITE_MEASURING_MODE> sMeasuringMode;
+static std::atomic<Float> sGDIGamma{1.4f};
+StaticDataMutex<StaticRefPtr<IDWriteRenderingParams>> sStandardRenderingParams(
+    "StandardRenderingParams");
+StaticDataMutex<StaticRefPtr<IDWriteRenderingParams>> sGDIRenderingParams(
+    "GDIRenderingParams");
+
+static void ClearStandardRenderingParams() {
+  auto lockedParams = sStandardRenderingParams.Lock();
+  lockedParams.ref() = nullptr;
+}
+
+static void ClearGDIRenderingParams() {
+  auto lockedParams = sGDIRenderingParams.Lock();
+  lockedParams.ref() = nullptr;
+}
+
+static void UpdateClearTypeLevel() {
+  sClearTypeLevel = gfxVars::SystemTextClearTypeLevel();
+}
+static void ClearTypeLevelVarUpdated() {
+  UpdateClearTypeLevel();
+  ClearStandardRenderingParams();
+  ClearGDIRenderingParams();
+}
+
+static void UpdateEnhancedContrast() {
+  sEnhancedContrast = gfxVars::SystemTextEnhancedContrast();
+}
+static void EnhancedContrastVarUpdated() {
+  UpdateEnhancedContrast();
+  ClearStandardRenderingParams();
+}
+
+static void UpdateGamma() { sGamma = gfxVars::SystemTextGamma(); }
+static void GammaVarUpdated() {
+  UpdateGamma();
+  ClearStandardRenderingParams();
+}
+
+static void UpdateGDIGamma() { sGDIGamma = gfxVars::SystemGDIGamma(); }
+static void GDIGammaVarUpdated() {
+  UpdateGDIGamma();
+  ClearGDIRenderingParams();
+}
+
+static void UpdatePixelGeometry() {
+  sPixelGeometry =
+      static_cast<DWRITE_PIXEL_GEOMETRY>(gfxVars::SystemTextPixelGeometry());
+  Factory::SetBGRSubpixelOrder(sPixelGeometry == DWRITE_PIXEL_GEOMETRY_BGR);
+}
+static void PixelGeometryVarUpdated() {
+  UpdatePixelGeometry();
+  ClearStandardRenderingParams();
+  ClearGDIRenderingParams();
+}
+
+static void UpdateRenderingMode() {
+  sRenderingMode =
+      static_cast<DWRITE_RENDERING_MODE>(gfxVars::SystemTextRenderingMode());
+  switch (sRenderingMode) {
+    case DWRITE_RENDERING_MODE_ALIASED:
+    case DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC:
+      sMeasuringMode = DWRITE_MEASURING_MODE_GDI_CLASSIC;
+      break;
+    case DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL:
+      sMeasuringMode = DWRITE_MEASURING_MODE_GDI_NATURAL;
+      break;
+    default:
+      sMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
+      break;
+  }
+}
+static void RenderingModeVarUpdated() {
+  UpdateRenderingMode();
+  ClearStandardRenderingParams();
+}
+
+DWriteSettings::DWriteSettings(bool aUseGDISettings)
+    : mUseGDISettings(aUseGDISettings) {}
+
+/* static */
+void DWriteSettings::Initialize() {
+  UpdateClearTypeLevel();
+  gfxVars::SetSystemTextClearTypeLevelListener(ClearTypeLevelVarUpdated);
+
+  UpdateEnhancedContrast();
+  gfxVars::SetSystemTextEnhancedContrastListener(EnhancedContrastVarUpdated);
+
+  UpdateGamma();
+  gfxVars::SetSystemTextGammaListener(GammaVarUpdated);
+
+  UpdateGDIGamma();
+  gfxVars::SetSystemGDIGammaListener(GDIGammaVarUpdated);
+
+  UpdateRenderingMode();
+  gfxVars::SetSystemTextRenderingModeListener(RenderingModeVarUpdated);
+
+  UpdatePixelGeometry();
+  gfxVars::SetSystemTextPixelGeometryListener(PixelGeometryVarUpdated);
+}
+
+/* static */
+DWriteSettings& DWriteSettings::Get(bool aGDISettings) {
+  DWriteSettings* settings;
+  if (aGDISettings) {
+    static DWriteSettings* sGDISettings =
+        new DWriteSettings(/* aUseGDISettings */ true);
+    settings = sGDISettings;
+  } else {
+    static DWriteSettings* sStandardSettings =
+        new DWriteSettings(/* aUseGDISettings */ false);
+    settings = sStandardSettings;
+  }
+  return *settings;
+}
+
+Float DWriteSettings::ClearTypeLevel() { return sClearTypeLevel; }
+
+Float DWriteSettings::EnhancedContrast() {
+  return mUseGDISettings ? 0.0f : sEnhancedContrast.load();
+}
+
+Float DWriteSettings::Gamma() { return mUseGDISettings ? sGDIGamma : sGamma; }
+
+DWRITE_PIXEL_GEOMETRY DWriteSettings::PixelGeometry() { return sPixelGeometry; }
+
+DWRITE_RENDERING_MODE DWriteSettings::RenderingMode() {
+  return mUseGDISettings ? DWRITE_RENDERING_MODE_GDI_CLASSIC : sRenderingMode;
+}
+
+DWRITE_MEASURING_MODE DWriteSettings::MeasuringMode() {
+  return mUseGDISettings ? DWRITE_MEASURING_MODE_GDI_CLASSIC : sMeasuringMode;
+}
+
+already_AddRefed<IDWriteRenderingParams> DWriteSettings::RenderingParams() {
+  auto lockedParams = mUseGDISettings ? sGDIRenderingParams.Lock()
+                                      : sStandardRenderingParams.Lock();
+  if (!lockedParams.ref()) {
+    RefPtr<IDWriteRenderingParams> params;
+    HRESULT hr = Factory::GetDWriteFactory()->CreateCustomRenderingParams(
+        Gamma(), EnhancedContrast(), ClearTypeLevel(), PixelGeometry(),
+        RenderingMode(), getter_AddRefs(params));
+    if (SUCCEEDED(hr)) {
+      lockedParams.ref() = params.forget();
+    } else {
+      gfxWarning() << "Failed to create DWrite custom rendering params.";
+    }
+  }
+
+  return do_AddRef(lockedParams.ref());
+}