Attachment 358459 Details for Bug 192305 – WiP patch

[patch] WiP patch

0001-WIP.patch (text/plain), 47.50 KB, created by Philippe Normand on 2019-01-06 10:16:58 PST

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Creator: Philippe Normand

Created: 2019-01-06 10:16:58 PST

Size: 47.50 KB

patch

obsolete

>From 8b3c41c4e34987d1385ad781e0fd1db5639332e6 Mon Sep 17 00:00:00 2001
>From: Philippe Normand <pnormand@igalia.com>
>Date: Sun, 6 Jan 2019 18:06:40 +0000
>Subject: [PATCH xserver] WIP
>
>---
> Source/WebCore/page/Frame.cpp                 |   4 +-
> Source/WebCore/page/Frame.h                   |   2 +-
> Source/WebCore/page/FrameView.cpp             |   5 +-
> Source/WebCore/page/FrameView.h               |   2 +-
> Source/WebKit/PlatformWPE.cmake               |   1 +
> .../CoordinatedGraphicsScene.cpp              |  17 +-
> .../CoordinatedGraphicsScene.h                |   4 +-
> .../threadedcompositor/ThreadedCompositor.cpp |  14 +-
> .../threadedcompositor/ThreadedCompositor.h   |   3 +-
> Source/WebKit/SourcesWPE.txt                  |   1 +
> .../UIProcess/API/glib/WebKitWebView.cpp      |  68 -------
> .../UIProcess/API/gtk/WebKitWebViewGtk.cpp    |  69 +++++++
> .../WebKit/UIProcess/API/wpe/WebKitColor.cpp  | 179 ++++++++++++++++++
> Source/WebKit/UIProcess/API/wpe/WebKitColor.h |  56 ++++++
> .../UIProcess/API/wpe/WebKitColorPrivate.h    |  37 ++++
> .../WebKit/UIProcess/API/wpe/WebKitWebView.h  |   7 +
> .../UIProcess/API/wpe/WebKitWebViewWPE.cpp    |  46 +++++
> .../API/wpe/docs/wpe-0.1-sections.txt         |  16 ++
> Source/WebKit/UIProcess/WebPageProxy.cpp      |  10 +
> Source/WebKit/UIProcess/WebPageProxy.h        |   6 +-
> .../WebCoreSupport/WebFrameLoaderClient.cpp   |   3 +-
> .../WebPage/AcceleratedDrawingArea.cpp        |   8 +
> .../WebPage/AcceleratedDrawingArea.h          |   1 +
> .../CoordinatedLayerTreeHost.cpp              |   5 +
> .../CoordinatedLayerTreeHost.h                |   1 +
> .../ThreadedCoordinatedLayerTreeHost.cpp      |  11 ++
> .../ThreadedCoordinatedLayerTreeHost.h        |   1 +
> .../WebKit/WebProcess/WebPage/DrawingArea.h   |   1 +
> .../WebKit/WebProcess/WebPage/LayerTreeHost.h |   1 +
> Source/WebKit/WebProcess/WebPage/WebPage.cpp  |  14 ++
> Source/WebKit/WebProcess/WebPage/WebPage.h    |   3 +
> .../WebProcess/WebPage/WebPage.messages.in    |   1 +
> Tools/MiniBrowser/wpe/main.cpp                |   8 +-
> .../Tests/WebKitGLib/TestWebKitWebView.cpp    |  39 +++-
> 34 files changed, 550 insertions(+), 94 deletions(-)
> create mode 100644 Source/WebKit/UIProcess/API/wpe/WebKitColor.cpp
> create mode 100644 Source/WebKit/UIProcess/API/wpe/WebKitColor.h
> create mode 100644 Source/WebKit/UIProcess/API/wpe/WebKitColorPrivate.h
>
>diff --git a/Source/WebCore/page/Frame.cpp b/Source/WebCore/page/Frame.cpp
>index 73bafdb4660..b4e0a350897 100644
>--- a/Source/WebCore/page/Frame.cpp
>+++ b/Source/WebCore/page/Frame.cpp
>@@ -902,7 +902,7 @@ RefPtr<Range> Frame::rangeForPoint(const IntPoint& framePoint)
>     return nullptr;
> }
> 
>-void Frame::createView(const IntSize& viewportSize, bool transparent,
>+void Frame::createView(const IntSize& viewportSize, bool transparent, const Color& backgroundColor,
>     const IntSize& fixedLayoutSize, const IntRect& fixedVisibleContentRect,
>     bool useFixedLayout, ScrollbarMode horizontalScrollbarMode, bool horizontalLock,
>     ScrollbarMode verticalScrollbarMode, bool verticalLock)
>@@ -933,7 +933,7 @@ void Frame::createView(const IntSize& viewportSize, bool transparent,
> 
>     setView(frameView.copyRef());
> 
>-    frameView->updateBackgroundRecursively(transparent);
>+    frameView->updateBackgroundRecursively(transparent, backgroundColor);
> 
>     if (isMainFrame)
>         frameView->setParentVisible(true);
>diff --git a/Source/WebCore/page/Frame.h b/Source/WebCore/page/Frame.h
>index 9faf2437f57..63cb12a71f8 100644
>--- a/Source/WebCore/page/Frame.h
>+++ b/Source/WebCore/page/Frame.h
>@@ -128,7 +128,7 @@ public:
>     WEBCORE_EXPORT void initWithSimpleHTMLDocument(const String& style, const URL&);
> #endif
>     WEBCORE_EXPORT void setView(RefPtr<FrameView>&&);
>-    WEBCORE_EXPORT void createView(const IntSize&, bool transparent,
>+    WEBCORE_EXPORT void createView(const IntSize&, bool transparent, const Color& backgroundColor,
>         const IntSize& fixedLayoutSize, const IntRect& fixedVisibleContentRect,
>         bool useFixedLayout = false, ScrollbarMode = ScrollbarAuto, bool horizontalLock = false,
>         ScrollbarMode = ScrollbarAuto, bool verticalLock = false);
>diff --git a/Source/WebCore/page/FrameView.cpp b/Source/WebCore/page/FrameView.cpp
>index df0e105a51e..ae21e96857d 100644
>--- a/Source/WebCore/page/FrameView.cpp
>+++ b/Source/WebCore/page/FrameView.cpp
>@@ -3000,12 +3000,13 @@ void FrameView::setBaseBackgroundColor(const Color& backgroundColor)
>     renderView()->compositor().rootBackgroundColorOrTransparencyChanged();
> }
> 
>-void FrameView::updateBackgroundRecursively(bool transparent)
>+void FrameView::updateBackgroundRecursively(bool transparent, const Color& defaultBackgroundColor)
> {
> #if ENABLE(DARK_MODE_CSS)
>+    UNUSED_PARAM(defaultBackgroundColor);
>     Color backgroundColor = transparent ? Color::transparent : RenderTheme::singleton().systemColor(CSSValueAppleSystemControlBackground, styleColorOptions());
> #else
>-    Color backgroundColor = transparent ? Color::transparent : Color::white;
>+    Color backgroundColor = transparent ? Color::transparent : defaultBackgroundColor;
> #endif
> 
>     for (auto* frame = m_frame.ptr(); frame; frame = frame->tree().traverseNext(m_frame.ptr())) {
>diff --git a/Source/WebCore/page/FrameView.h b/Source/WebCore/page/FrameView.h
>index 4f980094c08..dc721c8d4a8 100644
>--- a/Source/WebCore/page/FrameView.h
>+++ b/Source/WebCore/page/FrameView.h
>@@ -190,7 +190,7 @@ public:
> 
>     WEBCORE_EXPORT Color baseBackgroundColor() const;
>     WEBCORE_EXPORT void setBaseBackgroundColor(const Color&);
>-    WEBCORE_EXPORT void updateBackgroundRecursively(bool);
>+    WEBCORE_EXPORT void updateBackgroundRecursively(bool, const Color& backgroundColor = Color::white);
> 
>     enum ExtendedBackgroundModeFlags {
>         ExtendedBackgroundModeNone          = 0,
>diff --git a/Source/WebKit/PlatformWPE.cmake b/Source/WebKit/PlatformWPE.cmake
>index 1f675c44e4c..3cdefd2bed2 100644
>--- a/Source/WebKit/PlatformWPE.cmake
>+++ b/Source/WebKit/PlatformWPE.cmake
>@@ -97,6 +97,7 @@ set(WPE_API_INSTALLED_HEADERS
>     ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitBackForwardList.h
>     ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitBackForwardListItem.h
>     ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitCredential.h
>+    ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitColor.h
>     ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitContextMenu.h
>     ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitContextMenuActions.h
>     ${WEBKIT_DIR}/UIProcess/API/wpe/WebKitContextMenuItem.h
>diff --git a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp
>index 1b2ed1b0275..b8add4a42eb 100644
>--- a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp
>+++ b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.cpp
>@@ -65,7 +65,7 @@ void CoordinatedGraphicsScene::applyStateChanges(const Vector<CoordinatedGraphic
>         commitSceneState(state.nicosia);
> }
> 
>-void CoordinatedGraphicsScene::paintToCurrentGLContext(const TransformationMatrix& matrix, float opacity, const FloatRect& clipRect, const Color& backgroundColor, bool drawsBackground, TextureMapper::PaintFlags PaintFlags)
>+void CoordinatedGraphicsScene::paintToCurrentGLContext(const TransformationMatrix& matrix, const FloatRect& clipRect, const Color& backgroundColor, bool drawsBackground, TextureMapper::PaintFlags PaintFlags)
> {
>     updateSceneState();
> 
>@@ -78,18 +78,15 @@ void CoordinatedGraphicsScene::paintToCurrentGLContext(const TransformationMatri
>     m_textureMapper->beginPainting(PaintFlags);
>     m_textureMapper->beginClip(TransformationMatrix(), clipRect);
> 
>-    if (drawsBackground) {
>-        RGBA32 rgba = makeRGBA32FromFloats(backgroundColor.red(),
>-            backgroundColor.green(), backgroundColor.blue(),
>-            backgroundColor.alpha() * opacity);
>-        m_textureMapper->drawSolidColor(clipRect, TransformationMatrix(), Color(rgba));
>-    } else
>-        m_textureMapper->clearColor(m_viewBackgroundColor);
>+    auto& color = drawsBackground ? backgroundColor : m_viewBackgroundColor;
>+    m_textureMapper->clearColor(color);
> 
>-    if (currentRootLayer->opacity() != opacity || currentRootLayer->transform() != matrix) {
>+    float opacity = drawsBackground ? color.alphaAsFloat() : 1;
>+    if (!drawsBackground && (currentRootLayer->opacity() != opacity))
>         currentRootLayer->setOpacity(opacity);
>+
>+    if (currentRootLayer->transform() != matrix)
>         currentRootLayer->setTransform(matrix);
>-    }
> 
>     currentRootLayer->paint();
>     m_fpsCounter.updateFPSAndDisplay(*m_textureMapper, clipRect.location(), matrix);
>diff --git a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h
>index d4bb58268fe..d68f4f9902b 100644
>--- a/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h
>+++ b/Source/WebKit/Shared/CoordinatedGraphics/CoordinatedGraphicsScene.h
>@@ -72,7 +72,7 @@ public:
>     virtual ~CoordinatedGraphicsScene();
> 
>     void applyStateChanges(const Vector<WebCore::CoordinatedGraphicsState>&);
>-    void paintToCurrentGLContext(const WebCore::TransformationMatrix&, float, const WebCore::FloatRect&, const WebCore::Color& backgroundColor, bool drawsBackground, WebCore::TextureMapper::PaintFlags = 0);
>+    void paintToCurrentGLContext(const WebCore::TransformationMatrix&, const WebCore::FloatRect&, const WebCore::Color& backgroundColor, bool drawsBackground, WebCore::TextureMapper::PaintFlags = 0);
>     void detach();
> 
>     // The painting thread must lock the main thread to use below two methods, because two methods access members that the main thread manages. See m_client.
>@@ -113,7 +113,7 @@ private:
>     std::unique_ptr<WebCore::TextureMapperLayer> m_rootLayer;
> 
>     Nicosia::PlatformLayer::LayerID m_rootLayerID { 0 };
>-    WebCore::Color m_viewBackgroundColor { WebCore::Color::white };
>+    WebCore::Color m_viewBackgroundColor { WebCore::Color::transparent };
> 
>     WebCore::TextureMapperFPSCounter m_fpsCounter;
> };
>diff --git a/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp b/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp
>index 7522f84ea8f..ddbef56f756 100644
>--- a/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp
>+++ b/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp
>@@ -163,6 +163,13 @@ void ThreadedCompositor::setDrawsBackground(bool drawsBackground)
>     m_compositingRunLoop->scheduleUpdate();
> }
> 
>+void ThreadedCompositor::setBackgroundColor(const Color& backgroundColor)
>+{
>+    LockHolder locker(m_attributes.lock);
>+    m_attributes.backgroundColor = backgroundColor;
>+    m_compositingRunLoop->scheduleUpdate();
>+}
>+
> void ThreadedCompositor::updateViewport()
> {
>     m_compositingRunLoop->scheduleUpdate();
>@@ -196,6 +203,8 @@ void ThreadedCompositor::renderLayerTree()
>     float scaleFactor;
>     bool drawsBackground;
>     bool needsResize;
>+    WebCore::Color backgroundColor;
>+
>     Vector<WebCore::CoordinatedGraphicsState> states;
> 
>     {
>@@ -205,6 +214,7 @@ void ThreadedCompositor::renderLayerTree()
>         scaleFactor = m_attributes.scaleFactor;
>         drawsBackground = m_attributes.drawsBackground;
>         needsResize = m_attributes.needsResize;
>+        backgroundColor = m_attributes.backgroundColor;
> 
>         states = WTFMove(m_attributes.states);
> 
>@@ -253,8 +263,8 @@ void ThreadedCompositor::renderLayerTree()
>     }
> 
>     m_scene->applyStateChanges(states);
>-    m_scene->paintToCurrentGLContext(viewportTransform, 1, FloatRect { FloatPoint { }, viewportSize },
>-        Color::transparent, !drawsBackground, m_paintFlags);
>+    m_scene->paintToCurrentGLContext(viewportTransform, FloatRect { FloatPoint { }, viewportSize },
>+        backgroundColor, drawsBackground, m_paintFlags);
> 
>     m_context->swapBuffers();
> 
>diff --git a/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.h b/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.h
>index 6d7053850da..bc9ac616e38 100644
>--- a/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.h
>+++ b/Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.h
>@@ -71,6 +71,7 @@ public:
>     void setScrollPosition(const WebCore::IntPoint&, float scale);
>     void setViewportSize(const WebCore::IntSize&, float scale);
>     void setDrawsBackground(bool);
>+    void setBackgroundColor(const WebCore::Color&);
> 
>     void updateSceneState(const WebCore::CoordinatedGraphicsState&);
> 
>@@ -114,7 +115,7 @@ private:
>         float scaleFactor { 1 };
>         bool drawsBackground { true };
>         bool needsResize { false };
>-
>+        WebCore::Color backgroundColor;
>         Vector<WebCore::CoordinatedGraphicsState> states;
> 
>         bool clientRendersNextFrame { false };
>diff --git a/Source/WebKit/SourcesWPE.txt b/Source/WebKit/SourcesWPE.txt
>index 8ee2fef42a6..87583bad1fa 100644
>--- a/Source/WebKit/SourcesWPE.txt
>+++ b/Source/WebKit/SourcesWPE.txt
>@@ -167,6 +167,7 @@ UIProcess/API/glib/WebKitWindowProperties.cpp @no-unify
> UIProcess/API/wpe/CompositingManagerProxy.cpp @no-unify
> UIProcess/API/wpe/PageClientImpl.cpp @no-unify
> UIProcess/API/wpe/ScrollGestureController.cpp @no-unify
>+UIProcess/API/wpe/WebKitColor.cpp @no-unify
> UIProcess/API/wpe/WebKitScriptDialogWPE.cpp @no-unify
> UIProcess/API/wpe/WebKitWebViewBackend.cpp @no-unify
> UIProcess/API/wpe/WebKitWebViewWPE.cpp @no-unify
>diff --git a/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp b/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp
>index 67201d89eaa..7a8a10f5c1c 100644
>--- a/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp
>+++ b/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp
>@@ -3969,74 +3969,6 @@ void webkitWebViewWebProcessTerminated(WebKitWebView* webView, WebKitWebProcessT
>     g_signal_emit(webView, signals[WEB_PROCESS_TERMINATED], 0, reason);
> }
> 
>-#if PLATFORM(GTK)
>-/**
>- * webkit_web_view_set_background_color:
>- * @web_view: a #WebKitWebView
>- * @rgba: a #GdkRGBA
>- *
>- * Sets the color that will be used to draw the @web_view background before
>- * the actual contents are rendered. Note that if the web page loaded in @web_view
>- * specifies a background color, it will take precedence over the @rgba color.
>- * By default the @web_view background color is opaque white.
>- * Note that the parent window must have a RGBA visual and
>- * #GtkWidget:app-paintable property set to %TRUE for backgrounds colors to work.
>- *
>- * <informalexample><programlisting>
>- * static void browser_window_set_background_color (BrowserWindow *window,
>- *                                                  const GdkRGBA *rgba)
>- * {
>- *     WebKitWebView *web_view;
>- *     GdkScreen *screen = gtk_window_get_screen (GTK_WINDOW (window));
>- *     GdkVisual *rgba_visual = gdk_screen_get_rgba_visual (screen);
>- *
>- *     if (!rgba_visual)
>- *          return;
>- *
>- *     gtk_widget_set_visual (GTK_WIDGET (window), rgba_visual);
>- *     gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE);
>- *
>- *     web_view = browser_window_get_web_view (window);
>- *     webkit_web_view_set_background_color (web_view, rgba);
>- * }
>- * </programlisting></informalexample>
>- *
>- * Since: 2.8
>- */
>-void webkit_web_view_set_background_color(WebKitWebView* webView, const GdkRGBA* rgba)
>-{
>-    g_return_if_fail(WEBKIT_IS_WEB_VIEW(webView));
>-    g_return_if_fail(rgba);
>-
>-    Color color(*rgba);
>-    auto& page = getPage(webView);
>-    if (page.backgroundColor() == color)
>-        return;
>-
>-    page.setBackgroundColor(color);
>-    page.setDrawsBackground(color == Color::white);
>-}
>-
>-/**
>- * webkit_web_view_get_background_color:
>- * @web_view: a #WebKitWebView
>- * @rgba: (out): a #GdkRGBA to fill in with the background color
>- *
>- * Gets the color that is used to draw the @web_view background before
>- * the actual contents are rendered.
>- * For more information see also webkit_web_view_set_background_color()
>- *
>- * Since: 2.8
>- */
>-void webkit_web_view_get_background_color(WebKitWebView* webView, GdkRGBA* rgba)
>-{
>-    g_return_if_fail(WEBKIT_IS_WEB_VIEW(webView));
>-    g_return_if_fail(rgba);
>-
>-    *rgba = getPage(webView).backgroundColor();
>-}
>-#endif // PLATFORM(GTK)
>-
> /*
>  * webkit_web_view_is_editable:
>  * @web_view: a #WebKitWebView
>diff --git a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewGtk.cpp b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewGtk.cpp
>index bc821799128..ed569e62dc0 100644
>--- a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewGtk.cpp
>+++ b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewGtk.cpp
>@@ -24,6 +24,7 @@
> #include "WebKitScriptDialogImpl.h"
> #include "WebKitWebViewBasePrivate.h"
> #include "WebKitWebViewPrivate.h"
>+#include <WebCore/Color.h>
> #include <WebCore/GtkUtilities.h>
> #include <WebCore/PlatformDisplay.h>
> #include <WebCore/PlatformScreen.h>
>@@ -359,3 +360,71 @@ GtkWidget* webkit_web_view_new_with_user_content_manager(WebKitUserContentManage
> 
>     return GTK_WIDGET(g_object_new(WEBKIT_TYPE_WEB_VIEW, "user-content-manager", userContentManager, nullptr));
> }
>+
>+/**
>+ * webkit_web_view_set_background_color:
>+ * @web_view: a #WebKitWebView
>+ * @rgba: a #GdkRGBA
>+ *
>+ * Sets the color that will be used to draw the @web_view background before
>+ * the actual contents are rendered. Note that if the web page loaded in @web_view
>+ * specifies a background color, it will take precedence over the @rgba color.
>+ * By default the @web_view background color is opaque white.
>+ * Note that the parent window must have a RGBA visual and
>+ * #GtkWidget:app-paintable property set to %TRUE for backgrounds colors to work.
>+ *
>+ * <informalexample><programlisting>
>+ * static void browser_window_set_background_color (BrowserWindow *window,
>+ *                                                  const GdkRGBA *rgba)
>+ * {
>+ *     WebKitWebView *web_view;
>+ *     GdkScreen *screen = gtk_window_get_screen (GTK_WINDOW (window));
>+ *     GdkVisual *rgba_visual = gdk_screen_get_rgba_visual (screen);
>+ *
>+ *     if (!rgba_visual)
>+ *          return;
>+ *
>+ *     gtk_widget_set_visual (GTK_WIDGET (window), rgba_visual);
>+ *     gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE);
>+ *
>+ *     web_view = browser_window_get_web_view (window);
>+ *     webkit_web_view_set_background_color (web_view, rgba);
>+ * }
>+ * </programlisting></informalexample>
>+ *
>+ * Since: 2.8
>+ */
>+void webkit_web_view_set_background_color(WebKitWebView* webView, const GdkRGBA* rgba)
>+{
>+    g_return_if_fail(WEBKIT_IS_WEB_VIEW(webView));
>+    g_return_if_fail(rgba);
>+
>+    WebCore::Color color(*rgba);
>+    auto& page = *webkitWebViewBaseGetPage(reinterpret_cast<WebKitWebViewBase*>(webView));
>+    if (page.backgroundColor() == color)
>+        return;
>+
>+    if (!color.isOpaque())
>+        page.setDrawsBackground(false);
>+    page.setBackgroundColor(color);
>+}
>+
>+/**
>+ * webkit_web_view_get_background_color:
>+ * @web_view: a #WebKitWebView
>+ * @rgba: (out): a #GdkRGBA to fill in with the background color
>+ *
>+ * Gets the color that is used to draw the @web_view background before
>+ * the actual contents are rendered.
>+ * For more information see also webkit_web_view_set_background_color()
>+ *
>+ * Since: 2.8
>+ */
>+void webkit_web_view_get_background_color(WebKitWebView* webView, GdkRGBA* rgba)
>+{
>+    g_return_if_fail(WEBKIT_IS_WEB_VIEW(webView));
>+    g_return_if_fail(rgba);
>+
>+    auto& page = *webkitWebViewBaseGetPage(reinterpret_cast<WebKitWebViewBase*>(webView));
>+    *rgba = page.backgroundColor();
>+}
>diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitColor.cpp b/Source/WebKit/UIProcess/API/wpe/WebKitColor.cpp
>new file mode 100644
>index 00000000000..4a4a6e13199
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/API/wpe/WebKitColor.cpp
>@@ -0,0 +1,179 @@
>+/*
>+ * Copyright (C) 2019 Igalia S.L.
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * along with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+#include "WebKitColor.h"
>+
>+#include "WebKitColorPrivate.h"
>+
>+/**
>+ * SECTION: WebKitColor
>+ * @Short_description: A web view background color
>+ * @Title: WebKitColor
>+ * @See_also: #WebKitWebView.
>+ *
>+ * A WebKitColor is a boxed type wrapping a WebCore color.
>+ *
>+ * Since: 2.24
>+ */
>+
>+struct _WebKitColor {
>+    _WebKitColor(const WebCore::Color& color)
>+        : m_color(color)
>+    {
>+    }
>+
>+    ~_WebKitColor()
>+    {
>+    }
>+
>+    const WebCore::Color& color() const { return m_color; }
>+
>+    WebCore::Color m_color;
>+    int referenceCount { 1 };
>+};
>+
>+static WebKitColor* webkitColorRef(WebKitColor* color)
>+{
>+    ASSERT(color);
>+    g_atomic_int_inc(&color->referenceCount);
>+    return color;
>+}
>+
>+G_DEFINE_BOXED_TYPE(WebKitColor, webkit_color, webkitColorRef, webkitColorUnref)
>+
>+void webkitColorUnref(WebKitColor* color)
>+{
>+    ASSERT(color);
>+    if (g_atomic_int_dec_and_test(&color->referenceCount)) {
>+        color->~WebKitColor();
>+        fastFree(color);
>+    }
>+}
>+
>+WebKitColor* webkitColorFromColor(const WebCore::Color& color)
>+{
>+    auto* result = static_cast<WebKitColor*>(fastMalloc(sizeof(WebKitColor)));
>+    new (result) WebKitColor(color);
>+    return result;
>+}
>+
>+const WebCore::Color& webkitColorGetColor(WebKitColor* backgroundColor)
>+{
>+    return backgroundColor->color();
>+}
>+
>+/**
>+ * webkit_color_new_from_string:
>+ * @colorString: color representation as color nickname or HEX string
>+ *
>+ * Create a new #WebKitColor for the given color string
>+ * representation. There are two valid representation types: standard color
>+ * names (see https://htmlcolorcodes.com/color-names/ for instance) or HEX
>+ * values.
>+ *
>+ * Returns: a newly created #WebKitColor
>+ *
>+ * Since: 2.24
>+ */
>+WebKitColor* webkit_color_new_from_string(const char* colorString)
>+{
>+    return webkitColorFromColor(WebCore::Color(colorString));
>+}
>+
>+/**
>+ * webkit_color_get_red_channel:
>+ * @color: a #WebKitColor
>+ *
>+ * Provides read-only access to the red component of the color.
>+ *
>+ * Returns: a #gint clamped between 0 and 255.
>+ *
>+ * Since: 2.24
>+ */
>+gint webkit_color_get_red_channel(WebKitColor* color)
>+{
>+    g_return_val_if_fail(color, 0);
>+    return color->color().red();
>+}
>+
>+/**
>+ * webkit_color_get_green_channel:
>+ * @color: a #WebKitColor
>+ *
>+ * Provides read-only access to the green component of the color.
>+ *
>+ * Returns: a #gint clamped between 0 and 255.
>+ *
>+ * Since: 2.24
>+ */
>+gint webkit_color_get_green_channel(WebKitColor* color)
>+{
>+    g_return_val_if_fail(color, 0);
>+    return color->color().green();
>+}
>+
>+/**
>+ * webkit_color_get_blue_channel:
>+ * @color: a #WebKitColor
>+ *
>+ * Provides read-only access to the blue component of the color.
>+ *
>+ * Returns: a #gint clamped between 0 and 255.
>+ *
>+ * Since: 2.24
>+ */
>+gint webkit_color_get_blue_channel(WebKitColor* color)
>+{
>+    g_return_val_if_fail(color, 0);
>+    return color->color().blue();
>+}
>+
>+/**
>+ * webkit_color_get_alpha_channel:
>+ * @color: a #WebKitColor
>+ *
>+ * Provides read-only access to the alpha component of the color.
>+ *
>+ * Returns: a #gint clamped between 0 and 255.
>+ *
>+ * Since: 2.24
>+ */
>+gint webkit_color_get_alpha_channel(WebKitColor* color)
>+{
>+    g_return_val_if_fail(color, 0);
>+    return color->color().alpha();
>+}
>+
>+namespace WTF {
>+
>+template <> WebKitColor* refGPtr(WebKitColor* ptr)
>+{
>+    if (ptr)
>+        webkitColorRef(ptr);
>+    return ptr;
>+}
>+
>+template <> void derefGPtr(WebKitColor* ptr)
>+{
>+    if (ptr)
>+        webkitColorUnref(ptr);
>+}
>+
>+}
>diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitColor.h b/Source/WebKit/UIProcess/API/wpe/WebKitColor.h
>new file mode 100644
>index 00000000000..5559d22fee5
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/API/wpe/WebKitColor.h
>@@ -0,0 +1,56 @@
>+/*
>+ * Copyright (C) 2019 Igalia S.L.
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * along with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#if !defined(__WEBKIT_H_INSIDE__) && !defined(WEBKIT2_COMPILATION)
>+#error "Only <wpe/webkit.h> can be included directly."
>+#endif
>+
>+#ifndef WebKitColor_h
>+#define WebKitColor_h
>+
>+#include <glib-object.h>
>+#include <wpe/WebKitDefines.h>
>+
>+G_BEGIN_DECLS
>+
>+#define WEBKIT_TYPE_COLOR (webkit_color_get_type())
>+
>+typedef struct _WebKitColor WebKitColor;
>+
>+WEBKIT_API GType
>+webkit_color_get_type           (void);
>+
>+WEBKIT_API WebKitColor *
>+webkit_color_new_from_string    (const char* colorString);
>+
>+WEBKIT_API gint
>+webkit_color_get_red_channel    (WebKitColor* color);
>+
>+WEBKIT_API gint
>+webkit_color_get_green_channel  (WebKitColor* color);
>+
>+WEBKIT_API gint
>+webkit_color_get_blue_channel   (WebKitColor* color);
>+
>+WEBKIT_API gint
>+webkit_color_get_alpha_channel  (WebKitColor* color);
>+
>+G_END_DECLS
>+
>+#endif /* WebKitColor_h */
>diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitColorPrivate.h b/Source/WebKit/UIProcess/API/wpe/WebKitColorPrivate.h
>new file mode 100644
>index 00000000000..f0bb8656461
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/API/wpe/WebKitColorPrivate.h
>@@ -0,0 +1,37 @@
>+/*
>+ * Copyright (C) 2019 Igalia S.L.
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * along with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#include "Color.h"
>+#include "WebKitColor.h"
>+
>+#include <wtf/glib/GRefPtr.h>
>+
>+namespace WTF {
>+
>+template <> WebKitColor* refGPtr(WebKitColor* ptr);
>+template <> void derefGPtr(WebKitColor* ptr);
>+
>+}
>+
>+void webkitColorUnref(WebKitColor*);
>+
>+WebKitColor* webkitColorFromColor(const WebCore::Color&);
>+const WebCore::Color& webkitColorGetColor(WebKitColor*);
>diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitWebView.h b/Source/WebKit/UIProcess/API/wpe/WebKitWebView.h
>index 4102a7526d6..9df38839ee7 100644
>--- a/Source/WebKit/UIProcess/API/wpe/WebKitWebView.h
>+++ b/Source/WebKit/UIProcess/API/wpe/WebKitWebView.h
>@@ -49,6 +49,7 @@
> #include <wpe/WebKitWebContext.h>
> #include <wpe/WebKitWebResource.h>
> #include <wpe/WebKitWebViewBackend.h>
>+#include <wpe/WebKitColor.h>
> #include <wpe/WebKitWebViewSessionState.h>
> #include <wpe/WebKitWindowProperties.h>
> 
>@@ -517,6 +518,12 @@ WEBKIT_API void
> webkit_web_view_remove_frame_displayed_callback      (WebKitWebView               *web_view,
>                                                       guint                        id);
> 
>+WEBKIT_API void
>+webkit_web_view_set_background_color                 (WebKitWebView                *web_view,
>+                                                      WebKitColor                  *color);
>+WEBKIT_API WebKitColor *
>+webkit_web_view_get_background_color                 (WebKitWebView                *web_view);
>+
> G_END_DECLS
> 
> #endif
>diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewWPE.cpp b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewWPE.cpp
>index a3495e852e1..3527dc6d5c8 100644
>--- a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewWPE.cpp
>+++ b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewWPE.cpp
>@@ -20,6 +20,7 @@
> #include "config.h"
> #include "WebKitWebView.h"
> 
>+#include "WebKitColorPrivate.h"
> #include "WebKitWebViewPrivate.h"
> 
> gboolean webkitWebViewAuthenticate(WebKitWebView*, WebKitAuthenticationRequest*)
>@@ -178,3 +179,48 @@ WebKitWebView* webkit_web_view_new_with_user_content_manager(WebKitWebViewBacken
>         "user-content-manager", userContentManager,
>         nullptr));
> }
>+
>+/**
>+ * webkit_web_view_set_background_color:
>+ * @web_view: a #WebKitWebView
>+ * @backgroundColor: a #WebKitColor
>+ *
>+ * Sets the color that will be used to draw the @web_view background before
>+ * the actual contents are rendered. Note that if the web page loaded in @web_view
>+ * specifies a background color, it will take precedence over the background color.
>+ * By default the @web_view background color is opaque white.
>+ *
>+ * Since: 2.24
>+ */
>+void webkit_web_view_set_background_color(WebKitWebView* webView, WebKitColor* backgroundColor)
>+{
>+    g_return_if_fail(WEBKIT_IS_WEB_VIEW(webView));
>+    g_return_if_fail(backgroundColor);
>+
>+    auto& page = webkitWebViewGetPage(webView);
>+    auto& color = webkitColorGetColor(backgroundColor);
>+    if (!color.isOpaque())
>+        page.setDrawsBackground(false);
>+
>+    page.setBackgroundColor(color);
>+}
>+
>+/**
>+ * webkit_web_view_get_background_color:
>+ * @web_view: a #WebKitWebView
>+ *
>+ * Gets the color that is used to draw the @web_view background before the
>+ * actual contents are rendered. For more information see also
>+ * webkit_web_view_set_background_color().
>+ *
>+ * Returns: a #WebKitColor
>+ *
>+ * Since: 2.24
>+ */
>+WebKitColor* webkit_web_view_get_background_color(WebKitWebView* webView)
>+{
>+    g_return_val_if_fail(WEBKIT_IS_WEB_VIEW(webView), nullptr);
>+    auto& page = webkitWebViewGetPage(webView);
>+
>+    return webkitColorFromColor(page.backgroundColor());
>+}
>diff --git a/Source/WebKit/UIProcess/API/wpe/docs/wpe-0.1-sections.txt b/Source/WebKit/UIProcess/API/wpe/docs/wpe-0.1-sections.txt
>index 628db4252a4..f7a6b44d96c 100644
>--- a/Source/WebKit/UIProcess/API/wpe/docs/wpe-0.1-sections.txt
>+++ b/Source/WebKit/UIProcess/API/wpe/docs/wpe-0.1-sections.txt
>@@ -206,6 +206,8 @@ webkit_web_view_restore_session_state
> webkit_web_view_get_main_resource
> webkit_web_view_add_frame_displayed_callback
> webkit_web_view_remove_frame_displayed_callback
>+webkit_web_view_get_background_color
>+webkit_web_view_set_background_color
> 
> <SUBSECTION WebKitJavascriptResult>
> WebKitJavascriptResult
>@@ -266,6 +268,20 @@ webkit_web_view_backend_new
> webkit_web_view_backend_get_type
> </SECTION>
> 
>+<SECTION>
>+<FILE>WebKitColor</FILE>
>+WEBKIT_TYPE_COLOR
>+WebKitColor
>+webkit_color_new_from_string
>+webkit_color_get_red_channel
>+webkit_color_get_green_channel
>+webkit_color_get_blue_channel
>+webkit_color_get_alpha_channel
>+
>+<SUBSECTION Private>
>+webkit_color_get_type
>+</SECTION>
>+
> <SECTION>
> <FILE>WebKitAuthenticationRequest</FILE>
> WebKitAuthenticationRequest
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.cpp b/Source/WebKit/UIProcess/WebPageProxy.cpp
>index 55e3a82681e..71a41169857 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.cpp
>+++ b/Source/WebKit/UIProcess/WebPageProxy.cpp
>@@ -1546,6 +1546,16 @@ void WebPageProxy::setDrawsBackground(bool drawsBackground)
>         m_process->send(Messages::WebPage::SetDrawsBackground(drawsBackground), m_pageID);
> }
> 
>+void WebPageProxy::setBackgroundColor(const WebCore::Color& color)
>+{
>+    if (m_backgroundColor == color)
>+        return;
>+
>+    m_backgroundColor = color;
>+    if (isValid())
>+        m_process->send(Messages::WebPage::SetBackgroundColor(color), m_pageID);
>+}
>+
> void WebPageProxy::setTopContentInset(float contentInset)
> {
>     if (m_topContentInset == contentInset)
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.h b/Source/WebKit/UIProcess/WebPageProxy.h
>index 78ea9500676..a87a5b62548 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.h
>+++ b/Source/WebKit/UIProcess/WebPageProxy.h
>@@ -751,8 +751,10 @@ public:
> 
> #if PLATFORM(GTK)
>     PlatformWidget viewWidget();
>+#endif
>+#if PLATFORM(GTK) || PLATFORM(WPE)
>     const WebCore::Color& backgroundColor() const { return m_backgroundColor; }
>-    void setBackgroundColor(const WebCore::Color& color) { m_backgroundColor = color; }
>+    void setBackgroundColor(const WebCore::Color&);
> #endif
> 
> #if PLATFORM(WIN)
>@@ -2159,6 +2161,8 @@ private:
> 
> #if PLATFORM(GTK)
>     String m_accessibilityPlugID;
>+#endif
>+#if PLATFORM(GTK) || PLATFORM(WPE)
>     WebCore::Color m_backgroundColor { WebCore::Color::white };
> #endif
> 
>diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp b/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
>index aacb5b9ce61..70035ba3b8d 100644
>--- a/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
>+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
>@@ -1394,6 +1394,7 @@ void WebFrameLoaderClient::transitionToCommittedForNewPage()
> 
>     bool isMainFrame = m_frame->isMainFrame();
>     bool isTransparent = !webPage->drawsBackground();
>+    Color backgroundColor = webPage->backgroundColor();
>     bool shouldUseFixedLayout = isMainFrame && webPage->useFixedLayout();
>     bool shouldDisableScrolling = isMainFrame && !webPage->mainFrameIsScrollable();
>     bool shouldHideScrollbars = shouldDisableScrolling;
>@@ -1418,7 +1419,7 @@ void WebFrameLoaderClient::transitionToCommittedForNewPage()
>     bool horizontalLock = shouldHideScrollbars || webPage->alwaysShowsHorizontalScroller();
>     bool verticalLock = shouldHideScrollbars || webPage->alwaysShowsVerticalScroller();
> 
>-    m_frame->coreFrame()->createView(webPage->size(), isTransparent,
>+    m_frame->coreFrame()->createView(webPage->size(), isTransparent, backgroundColor,
>         webPage->fixedLayoutSize(), fixedVisibleContentRect, shouldUseFixedLayout,
>         horizontalScrollbarMode, horizontalLock, verticalScrollbarMode, verticalLock);
> 
>diff --git a/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.cpp b/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.cpp
>index 9920465b173..f83ec064f4e 100644
>--- a/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.cpp
>@@ -101,6 +101,14 @@ void AcceleratedDrawingArea::pageBackgroundTransparencyChanged()
>         m_previousLayerTreeHost->pageBackgroundTransparencyChanged();
> }
> 
>+void AcceleratedDrawingArea::pageBackgroundColorChanged()
>+{
>+    if (m_layerTreeHost)
>+        m_layerTreeHost->pageBackgroundColorChanged();
>+    else if (m_previousLayerTreeHost)
>+        m_previousLayerTreeHost->pageBackgroundColorChanged();
>+}
>+
> void AcceleratedDrawingArea::setLayerTreeStateIsFrozen(bool isFrozen)
> {
>     if (m_layerTreeStateIsFrozen == isFrozen)
>diff --git a/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.h b/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.h
>index 70abe435925..c2bd5f76a96 100644
>--- a/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.h
>+++ b/Source/WebKit/WebProcess/WebPage/AcceleratedDrawingArea.h
>@@ -44,6 +44,7 @@ protected:
>     void setNeedsDisplayInRect(const WebCore::IntRect&) override;
>     void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta) override;
>     void pageBackgroundTransparencyChanged() override;
>+    void pageBackgroundColorChanged() override;
>     void setLayerTreeStateIsFrozen(bool) override;
>     bool layerTreeStateIsFrozen() const override { return m_layerTreeStateIsFrozen; }
>     LayerTreeHost* layerTreeHost() const override { return m_layerTreeHost.get(); }
>diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp
>index 1520f520dac..aef4f015d6c 100644
>--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.cpp
>@@ -228,6 +228,11 @@ void CoordinatedLayerTreeHost::pageBackgroundTransparencyChanged()
> {
> }
> 
>+void CoordinatedLayerTreeHost::pageBackgroundColorChanged()
>+{
>+
>+}
>+
> GraphicsLayerFactory* CoordinatedLayerTreeHost::graphicsLayerFactory()
> {
>     return &m_coordinator;
>diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.h b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.h
>index 0a8bec8a398..27cae004e42 100644
>--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.h
>+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/CoordinatedLayerTreeHost.h
>@@ -56,6 +56,7 @@ protected:
> 
>     void deviceOrPageScaleFactorChanged() override;
>     void pageBackgroundTransparencyChanged() override;
>+    void pageBackgroundColorChanged() override;
> 
>     void setVisibleContentsRect(const WebCore::FloatRect&);
>     void renderNextFrame(bool);
>diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp
>index 823b7fa2ac7..f8e2b5d0ece 100644
>--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.cpp
>@@ -195,6 +195,17 @@ void ThreadedCoordinatedLayerTreeHost::pageBackgroundTransparencyChanged()
>     m_compositor->setDrawsBackground(m_webPage.drawsBackground());
> }
> 
>+void ThreadedCoordinatedLayerTreeHost::pageBackgroundColorChanged()
>+{
>+    if (m_isDiscardable) {
>+        m_discardableSyncActions.add(DiscardableSyncActions::UpdateBackground);
>+        return;
>+    }
>+
>+    CoordinatedLayerTreeHost::pageBackgroundColorChanged();
>+    m_compositor->setBackgroundColor(m_webPage.backgroundColor());
>+}
>+
> void ThreadedCoordinatedLayerTreeHost::sizeDidChange(const IntSize& size)
> {
>     if (m_isDiscardable) {
>diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h
>index b784681679b..84b3f883283 100644
>--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h
>+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h
>@@ -58,6 +58,7 @@ private:
>     void sizeDidChange(const WebCore::IntSize&) override;
>     void deviceOrPageScaleFactorChanged() override;
>     void pageBackgroundTransparencyChanged() override;
>+    void pageBackgroundColorChanged() override;
> 
>     void contentsSizeChanged(const WebCore::IntSize&) override;
>     void didChangeViewportAttributes(WebCore::ViewportAttributes&&) override;
>diff --git a/Source/WebKit/WebProcess/WebPage/DrawingArea.h b/Source/WebKit/WebProcess/WebPage/DrawingArea.h
>index f9c89174a4a..1b2bcbeab83 100644
>--- a/Source/WebKit/WebProcess/WebPage/DrawingArea.h
>+++ b/Source/WebKit/WebProcess/WebPage/DrawingArea.h
>@@ -80,6 +80,7 @@ public:
> 
>     // FIXME: These should be pure virtual.
>     virtual void pageBackgroundTransparencyChanged() { }
>+    virtual void pageBackgroundColorChanged() { }
>     virtual void forceRepaint() { }
>     virtual bool forceRepaintAsync(CallbackID) { return false; }
>     virtual void setLayerTreeStateIsFrozen(bool) { }
>diff --git a/Source/WebKit/WebProcess/WebPage/LayerTreeHost.h b/Source/WebKit/WebProcess/WebPage/LayerTreeHost.h
>index 85dd458e018..1668bbb9d63 100644
>--- a/Source/WebKit/WebProcess/WebPage/LayerTreeHost.h
>+++ b/Source/WebKit/WebProcess/WebPage/LayerTreeHost.h
>@@ -75,6 +75,7 @@ public:
>     virtual bool forceRepaintAsync(CallbackID) { return false; }
>     virtual void sizeDidChange(const WebCore::IntSize& newSize) = 0;
>     virtual void pageBackgroundTransparencyChanged() = 0;
>+    virtual void pageBackgroundColorChanged() = 0;
> 
>     virtual void pauseRendering();
>     virtual void resumeRendering();
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.cpp b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>index f6d4bea1d35..55387b0b79f 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>@@ -2884,6 +2884,20 @@ void WebPage::setDrawsBackground(bool drawsBackground)
>     m_drawingArea->setNeedsDisplay();
> }
> 
>+void WebPage::setBackgroundColor(const WebCore::Color& backgroundColor)
>+{
>+    if (m_backgroundColor == backgroundColor)
>+        return;
>+
>+    m_backgroundColor = backgroundColor;
>+
>+    if (FrameView* frameView = mainFrameView())
>+        frameView->setBaseBackgroundColor(backgroundColor);
>+
>+    m_drawingArea->pageBackgroundColorChanged();
>+    m_drawingArea->setNeedsDisplay();
>+}
>+
> #if PLATFORM(COCOA)
> void WebPage::setTopContentInsetFenced(float contentInset, IPC::Attachment fencePort)
> {
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.h b/Source/WebKit/WebProcess/WebPage/WebPage.h
>index 6e5c92e5848..37dcf3ac965 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.h
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.h
>@@ -1136,6 +1136,8 @@ public:
> 
>     void didReceiveWebPageMessage(IPC::Connection&, IPC::Decoder&);
> 
>+    const WebCore::Color& backgroundColor() const { return m_backgroundColor; }
>+
> private:
>     WebPage(uint64_t pageID, WebPageCreationParameters&&);
> 
>@@ -1263,6 +1265,7 @@ private:
> #endif
> 
>     void setDrawsBackground(bool);
>+    void setBackgroundColor(const WebCore::Color&);
> 
> #if PLATFORM(COCOA)
>     void setTopContentInsetFenced(float, IPC::Attachment);
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>index 54abbaf8934..5fafff3d497 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>@@ -26,6 +26,7 @@ messages -> WebPage LegacyReceiver {
>     SetLayerHostingMode(enum:uint8_t WebKit::LayerHostingMode layerHostingMode)
> 
>     SetDrawsBackground(bool drawsBackground)
>+    SetBackgroundColor(WebCore::Color color)
> 
>     AddConsoleMessage(uint64_t frameID, enum:uint8_t JSC::MessageSource messageSource, enum:uint8_t JSC::MessageLevel messageLevel, String message, uint64_t requestID)
>     SendCSPViolationReport(uint64_t frameID, URL reportURL, IPC::FormDataReference reportData)
>diff --git a/Tools/MiniBrowser/wpe/main.cpp b/Tools/MiniBrowser/wpe/main.cpp
>index e0c29b21299..1ce1278e35d 100644
>--- a/Tools/MiniBrowser/wpe/main.cpp
>+++ b/Tools/MiniBrowser/wpe/main.cpp
>@@ -42,6 +42,7 @@ static gboolean ignoreTLSErrors;
> static const char* cookiesFile;
> static const char* cookiesPolicy;
> static const char* proxy;
>+const char* bgColor;
> 
> static const GOptionEntry commandLineOptions[] =
> {
>@@ -53,6 +54,7 @@ static const GOptionEntry commandLineOptions[] =
>     { "proxy", 0, 0, G_OPTION_ARG_STRING, &proxy, "Set proxy", "PROXY" },
>     { "ignore-host", 0, 0, G_OPTION_ARG_STRING_ARRAY, &ignoreHosts, "Set proxy ignore hosts", "HOSTS" },
>     { "ignore-tls-errors", 0, 0, G_OPTION_ARG_NONE, &ignoreTLSErrors, "Ignore TLS errors", nullptr },
>+    { "bg-color", 0, 0, G_OPTION_ARG_STRING, &bgColor, "Window background color (white by default)", "white" },
>     { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &uriArguments, nullptr, "[URL]" },
>     { nullptr, 0, 0, G_OPTION_ARG_NONE, nullptr, nullptr, nullptr }
> };
>@@ -194,6 +196,10 @@ int main(int argc, char *argv[])
>     if (ignoreTLSErrors)
>         webkit_web_context_set_tls_errors_policy(webContext, WEBKIT_TLS_ERRORS_POLICY_IGNORE);
> 
>+    auto* backgroundColor = webkit_color_new_from_string(bgColor);
>+    webkit_web_view_set_background_color(webView, backgroundColor);
>+    g_boxed_free(WEBKIT_TYPE_COLOR, backgroundColor);
>+
>     if (uriArguments)
>         webkit_web_view_load_uri(webView, uriArguments[0]);
>     else if (!automationMode)
>@@ -202,7 +208,7 @@ int main(int argc, char *argv[])
>     g_main_loop_run(loop);
> 
>     g_object_unref(webView);
>-    if (privateMode)
>+    if (privateMode || automationMode)
>         g_object_unref(webContext);
>     g_main_loop_unref(loop);
> 
>diff --git a/Tools/TestWebKitAPI/Tests/WebKitGLib/TestWebKitWebView.cpp b/Tools/TestWebKitAPI/Tests/WebKitGLib/TestWebKitWebView.cpp
>index d757341b0fb..a5317811a4c 100644
>--- a/Tools/TestWebKitAPI/Tests/WebKitGLib/TestWebKitWebView.cpp
>+++ b/Tools/TestWebKitAPI/Tests/WebKitGLib/TestWebKitWebView.cpp
>@@ -1133,9 +1133,9 @@ static void testWebViewIsPlayingAudio(IsPlayingAudioWebViewTest* test, gconstpoi
>     g_assert(!webkit_web_view_is_playing_audio(test->m_webView));
> }
> 
>-#if PLATFORM(GTK)
> static void testWebViewBackgroundColor(WebViewTest* test, gconstpointer)
> {
>+#if PLATFORM(GTK)
>     // White is the default background.
>     GdkRGBA rgba;
>     webkit_web_view_get_background_color(test->m_webView, &rgba);
>@@ -1154,11 +1154,46 @@ static void testWebViewBackgroundColor(WebViewTest* test, gconstpointer)
>     g_assert_cmpfloat(rgba.green, ==, 0);
>     g_assert_cmpfloat(rgba.blue, ==, 0);
>     g_assert_cmpfloat(rgba.alpha, ==, 0.5);
>+#endif
>+#if PLATFORM(WPE)
>+    // White is the default background.
>+    WebKitColor* color = webkit_web_view_get_background_color(test->m_webView);
>+    g_assert_cmpint(webkit_color_get_red_channel(color), ==, 255);
>+    g_assert_cmpint(webkit_color_get_green_channel(color), ==, 255);
>+    g_assert_cmpint(webkit_color_get_blue_channel(color), ==, 255);
>+    g_assert_cmpint(webkit_color_get_alpha_channel(color), ==, 255);
>+    g_boxed_free(WEBKIT_TYPE_COLOR, color);
>+
>+    // Set to green.
>+    WebKitColor* color2 = webkit_color_new_from_string("green");
>+    webkit_web_view_set_background_color(test->m_webView, color2);
>+    g_boxed_free(WEBKIT_TYPE_COLOR, color2);
>+
>+    color = webkit_web_view_get_background_color(test->m_webView);
>+    g_assert_cmpint(webkit_color_get_red_channel(color), ==, 0);
>+    g_assert_cmpint(webkit_color_get_green_channel(color), ==, 128);
>+    g_assert_cmpint(webkit_color_get_blue_channel(color), ==, 0);
>+    g_assert_cmpint(webkit_color_get_alpha_channel(color), ==, 255);
>+    g_boxed_free(WEBKIT_TYPE_COLOR, color);
>+
>+    // Fully transparent
>+    color2 = webkit_color_new_from_string("transparent");
>+    webkit_web_view_set_background_color(test->m_webView, color2);
>+    g_boxed_free(WEBKIT_TYPE_COLOR, color2);
>+
>+    color = webkit_web_view_get_background_color(test->m_webView);
>+    g_assert_cmpint(webkit_color_get_red_channel(color), ==, 0);
>+    g_assert_cmpint(webkit_color_get_green_channel(color), ==, 0);
>+    g_assert_cmpint(webkit_color_get_blue_channel(color), ==, 0);
>+    g_assert_cmpint(webkit_color_get_alpha_channel(color), ==, 0);
>+    g_boxed_free(WEBKIT_TYPE_COLOR, color);
> 
>+#endif
>     // The actual rendering can't be tested using unit tests, use
>     // MiniBrowser --bg-color="<color-value>" for manually testing this API.
> }
> 
>+#if PLATFORM(GTK)
> static void testWebViewPreferredSize(WebViewTest* test, gconstpointer)
> {
>     test->loadHtml("<html style='width: 325px; height: 615px'></html>", nullptr);
>@@ -1363,8 +1398,8 @@ void beforeAll()
>     NotificationWebViewTest::add("WebKitWebView", "notification-initial-permission-disallowed", testWebViewNotificationInitialPermissionDisallowed);
> #endif
>     IsPlayingAudioWebViewTest::add("WebKitWebView", "is-playing-audio", testWebViewIsPlayingAudio);
>-#if PLATFORM(GTK)
>     WebViewTest::add("WebKitWebView", "background-color", testWebViewBackgroundColor);
>+#if PLATFORM(GTK)
>     WebViewTest::add("WebKitWebView", "preferred-size", testWebViewPreferredSize);
> #endif
>     WebViewTitleTest::add("WebKitWebView", "title-change", testWebViewTitleChange);
>-- 
>2.20.1
>

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Attachments on bug 192305: 356371 | 358458 | 358459 | 358597 | 358799 | 359005 | 359470 | 359477 | 360849 | 361048 | 361672 | 361676 | 361678