Use translucent/dialogs/background elements where possible

In effects it's obvious that compositing is enabled, so specifying the
translucent element is no problem.

In tabbox a context property "compositing" is injected which decides
whether "translucent" or "opaque" elements should be used. Here the
translucent elements are only used if the Blur effect is available - for
this a new Effect::Feature Blur is introduced and in addition it is
tested whether the theme provides the translucent element.

Also the masking is adjusted to ensure that only the shadow is not
blurred.

Reason for this change is that Plasma theme seems not always to pick up
whether compositing is used when used from inside KWin. It does not cover
the Desktop Change OSD which uses PlasmaCore.Dialog and there we cannot
(yet) inject that we use compositing.

Overall I'm quite unhappy with this patch and I do hope we can fix it in
the proper place in the lifetime of 4.10 and revert this patch.

CCBUG: 311995
REVIEW: 108438

effects/blur/blur.h

@@ -55,6 +55,7 @@ public:
     bool isCacheTexture() const {
         return m_shouldCache;
     }
+    virtual bool provides(Feature feature);
 
 public Q_SLOTS:
     void slotWindowAdded(KWin::EffectWindow *w);
@@ -94,6 +95,16 @@ private:
     typedef QHash<const EffectWindow*, BlurWindowInfo>::iterator CacheEntry;
 };
 
+inline
+bool BlurEffect::provides(Effect::Feature feature)
+{
+    if (feature == Blur) {
+        return true;
+    }
+    return KWin::Effect::provides(feature);
+}
+
+
 } // namespace KWin
 
 #endif

effects/desktopgrid/desktopgrid.cpp

@@ -41,6 +41,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <QtGui/QVector2D>
 #include <Plasma/FrameSvg>
 #include <Plasma/PushButton>
+#include <Plasma/Theme>
 #include <Plasma/WindowEffects>
 
 namespace KWin
@@ -1418,7 +1419,11 @@ DesktopButtonsView::DesktopButtonsView(QWidget* parent)
     scene->addItem(form);
 
     m_frame = new Plasma::FrameSvg(this);
-    m_frame->setImagePath("dialogs/background");
+    if (Plasma::Theme::defaultTheme()->currentThemeHasImage("translucent/dialogs/background")) {
+        m_frame->setImagePath("translucent/dialogs/background");
+    } else {
+        m_frame->setImagePath("dialogs/background");
+    }
     m_frame->setCacheAllRenderedFrames(true);
     m_frame->setEnabledBorders(Plasma::FrameSvg::AllBorders);
     qreal left, top, right, bottom;
@@ -1427,7 +1432,6 @@ DesktopButtonsView::DesktopButtonsView(QWidget* parent)
     qreal height = form->size().height() + top + bottom;
     m_frame->resizeFrame(QSizeF(width, height));
     Plasma::WindowEffects::enableBlurBehind(winId(), true, m_frame->mask());
-    Plasma::WindowEffects::overrideShadow(winId(), true);
     form->setPos(left, top);
     scene->setSceneRect(QRectF(QPointF(0, 0), QSizeF(width, height)));
     setScene(scene);

effects/presentwindows/presentwindows.cpp

@@ -35,6 +35,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <QtGui/QGraphicsLinearLayout>
 #include <Plasma/FrameSvg>
 #include <Plasma/PushButton>
+#include <Plasma/Theme>
 #include <Plasma/WindowEffects>
 #include <netwm_def.h>
 
@@ -1961,7 +1962,11 @@ CloseWindowView::CloseWindowView(QWidget* parent)
     scene->addItem(form);
 
     m_frame = new Plasma::FrameSvg(this);
-    m_frame->setImagePath("dialogs/background");
+    if (Plasma::Theme::defaultTheme()->currentThemeHasImage("translucent/dialogs/background")) {
+        m_frame->setImagePath("translucent/dialogs/background");
+    } else {
+        m_frame->setImagePath("dialogs/background");
+    }
     m_frame->setCacheAllRenderedFrames(true);
     m_frame->setEnabledBorders(Plasma::FrameSvg::AllBorders);
     qreal left, top, right, bottom;
@@ -1970,7 +1975,6 @@ CloseWindowView::CloseWindowView(QWidget* parent)
     qreal height = form->size().height() + top + bottom;
     m_frame->resizeFrame(QSizeF(width, height));
     Plasma::WindowEffects::enableBlurBehind(winId(), true, m_frame->mask());
-    Plasma::WindowEffects::overrideShadow(winId(), true);
     form->setPos(left, top);
     scene->setSceneRect(QRectF(QPointF(0, 0), QSizeF(width, height)));
     setScene(scene);

libkwineffects/kwineffects.h

@@ -324,7 +324,7 @@ public:
     };
 
     enum Feature {
-        Nothing = 0, Resize, GeometryTip, Outline, ScreenInversion
+        Nothing = 0, Resize, GeometryTip, Outline, ScreenInversion, Blur
     };
 
     /**

tabbox/declarative.cpp

@@ -43,6 +43,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // KWin
 #include "thumbnailitem.h"
 #include <kwindowsystem.h>
+#include "../effects.h"
 #include "../client.h"
 #include "../workspace.h"
 
@@ -101,6 +102,19 @@ QPixmap ImageProvider::requestPixmap(const QString &id, QSize *size, const QSize
     return icon;
 }
 
+static bool compositing()
+{
+#ifndef TABBOX_KCM
+    if (!Workspace::self()->compositing() || !effects) {
+        return false;
+    }
+    if (!static_cast<EffectsHandlerImpl*>(effects)->provides(Effect::Blur)) {
+        return false;
+    }
+#endif
+    return Plasma::Theme::defaultTheme()->currentThemeHasImage("translucent/dialogs/background");
+}
+
 DeclarativeView::DeclarativeView(QAbstractItemModel *model, TabBoxConfig::TabBoxMode mode, QWidget *parent)
     : QDeclarativeView(parent)
     , m_model(model)
@@ -131,6 +145,7 @@ DeclarativeView::DeclarativeView(QAbstractItemModel *model, TabBoxConfig::TabBox
     kdeclarative.setupBindings();
     qmlRegisterType<ThumbnailItem>("org.kde.kwin", 0, 1, "ThumbnailItem");
     rootContext()->setContextProperty("viewId", static_cast<qulonglong>(winId()));
+    rootContext()->setContextProperty("compositing", compositing());
     if (m_mode == TabBoxConfig::ClientTabBox) {
         rootContext()->setContextProperty("clientModel", model);
     } else if (m_mode == TabBoxConfig::DesktopTabBox) {
@@ -173,6 +188,7 @@ void DeclarativeView::showEvent(QShowEvent *event)
         item->setProperty("currentIndex", tabBox->first().row());
         connect(item, SIGNAL(currentIndexChanged(int)), SLOT(currentIndexChanged(int)));
     }
+    rootContext()->setContextProperty("compositing", compositing());
     slotUpdateGeometry();
     QGraphicsView::showEvent(event);
 }
@@ -194,10 +210,9 @@ void DeclarativeView::resizeEvent(QResizeEvent *event)
             m_frame->setImagePath(maskImagePath);
             m_frame->resizeFrame(QSizeF(maskWidth, maskHeight));
             QRegion mask = m_frame->mask().translated(maskLeftMargin, maskTopMargin);
-            if (Plasma::Theme::defaultTheme()->windowTranslucencyEnabled()) {
+            if (compositing()) {
                 // blur background
                 Plasma::WindowEffects::enableBlurBehind(winId(), true, mask);
-                Plasma::WindowEffects::overrideShadow(winId(), true);
                 clearMask();
             } else {
                 // do not trim to mask with compositing enabled, otherwise shadows are cropped

tabbox/qml/CMakeLists.txt

@@ -23,6 +23,7 @@ install( FILES clients/window_strip/metadata.desktop DESTINATION ${SERVICES_INST
 
 install (FILES IconTabBox.qml ShadowedSvgItem.qml DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/tabbox/big_icons/contents/ui)
 install (FILES IconTabBox.qml ShadowedSvgItem.qml DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/tabbox/small_icons/contents/ui)
+install (FILES ShadowedSvgItem.qml DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/tabbox/)
 install (FILES ShadowedSvgItem.qml DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/tabbox/compact/contents/ui)
 install (FILES ShadowedSvgItem.qml DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/tabbox/informative/contents/ui)
 install (FILES ShadowedSvgItem.qml DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/tabbox/present_windows/contents/ui)

tabbox/qml/ShadowedSvgItem.qml

@@ -22,24 +22,26 @@ import QtQuick 1.0
 import org.kde.plasma.core 0.1 as PlasmaCore
 
 Item {
-    property double leftMargin: background.margins.left + shadow.margins.left
-    property double topMargin: background.margins.top + shadow.margins.top
-    property double rightMargin: background.margins.right + shadow.margins.right
-    property double bottomMargin: background.margins.bottom + shadow.margins.bottom
-    property double centerWidth: background.width
-    property double centerHeight: background.height
+    property double leftMargin: shadow.margins.left + background.margins.left
+    property double topMargin: shadow.margins.top + background.margins.top
+    property double rightMargin: shadow.margins.right + background.margins.right
+    property double bottomMargin: shadow.margins.bottom + background.margins.bottom
+    property double centerWidth: shadow.width - shadow.margins.left - shadow.margins.right
+    property double centerHeight: shadow.height - shadow.margins.bottom - shadow.margins.top
     property int centerTopMargin: shadow.margins.top
     property int centerLeftMargin: shadow.margins.left
+    property alias maskImagePath: shadow.imagePath
 
     PlasmaCore.FrameSvgItem {
         id: shadow
-        imagePath: "dialogs/background"
+        imagePath: (compositing ? "translucent" : "opaque") + "/dialogs/background"
         prefix: "shadow"
         anchors.fill: parent
 
         PlasmaCore.FrameSvgItem {
             id: background
-            imagePath: "dialogs/background"
+            imagePath: shadow.imagePath
+            visible: false
             anchors {
                 fill: parent
                 leftMargin: shadow.margins.left

tabbox/qml/clients/big_icons/contents/ui/main.qml

@@ -30,7 +30,7 @@ Item {
     property int optimalHeight: icons.iconSize + icons.margins.top + icons.margins.bottom + background.topMargin + background.bottomMargin + 40
     property bool canStretchX: false
     property bool canStretchY: false
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/clients/compact/contents/ui/main.qml

@@ -31,7 +31,7 @@ Item {
     property int optimalHeight: compactListView.rowHeight * compactListView.count + background.topMargin + background.bottomMargin
     property bool canStretchX: true
     property bool canStretchY: false
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/clients/informative/contents/ui/main.qml

@@ -32,7 +32,7 @@ Item {
     property int optimalHeight: listView.rowHeight * listView.count + background.topMargin + background.bottomMargin
     property bool canStretchX: true
     property bool canStretchY: false
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/clients/present_windows/contents/ui/main.qml

@@ -30,7 +30,7 @@ Item {
     property int optimalHeight: 0.9*screenHeight
     property int imagePathPrefix: (new Date()).getTime()
     property int standardMargin: 2
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/clients/small_icons/contents/ui/main.qml

@@ -30,7 +30,7 @@ Item {
     property int optimalHeight: icons.iconSize + icons.margins.top + icons.margins.bottom + background.topMargin + background.bottomMargin + 40
     property bool canStretchX: false
     property bool canStretchY: false
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/clients/text/contents/ui/main.qml

@@ -30,7 +30,7 @@ Item {
     property int optimalHeight: textListView.rowHeight * textListView.count + background.topMargin + background.bottomMargin
     property bool canStretchX: true
     property bool canStretchY: false
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/clients/thumbnails/contents/ui/main.qml

@@ -32,7 +32,7 @@ Item {
     property int optimalHeight: thumbnailListView.thumbnailWidth*(1.0/screenFactor) + hoverItem.margins.top + hoverItem.margins.bottom + background.topMargin + background.bottomMargin + 40
     property bool canStretchX: false
     property bool canStretchY: false
-    property string maskImagePath: "dialogs/background"
+    property string maskImagePath: background.maskImagePath
     property double maskWidth: background.centerWidth
     property double maskHeight: background.centerHeight
     property int maskTopMargin: background.centerTopMargin

tabbox/qml/desktop.qml

@@ -28,9 +28,14 @@ Item {
     property bool allDesktops: true
     property string longestCaption: ""
     property int optimalWidth: listView.maxRowWidth
-    property int optimalHeight: listView.rowHeight * listView.count + background.margins.top + background.margins.bottom
+    property int optimalHeight: listView.rowHeight * listView.count + background.topMargin + background.bottomMargin
     property bool canStretchX: true
     property bool canStretchY: false
+    property string maskImagePath: background.maskImagePath
+    property double maskWidth: background.centerWidth
+    property double maskHeight: background.centerHeight
+    property int maskTopMargin: background.centerTopMargin
+    property int maskLeftMargin: background.centerLeftMargin
     width: Math.min(Math.max(screenWidth * 0.2, optimalWidth), screenWidth * 0.8)
     height: Math.min(optimalHeight, screenHeight * 0.8)
 
@@ -57,10 +62,9 @@ Item {
         visible: false
     }
 
-    PlasmaCore.FrameSvgItem {
+    ShadowedSvgItem {
         id: background
         anchors.fill: parent
-        imagePath: "dialogs/background"
     }
 
     // delegate
@@ -120,7 +124,7 @@ Item {
                 listView, "calculateMaxRowWidth");
             width = Math.max(textElement.width, width);
             textElement.destroy();
-            return width + 32 + hoverItem.margins.right + hoverItem.margins.left + background.margins.left + background.margins.right;
+            return width + 32 + hoverItem.margins.right + hoverItem.margins.left + background.leftMargin + background.rightMargin;
         }
         /**
         * Calculates the height of one row based on the text height and icon size.
@@ -150,10 +154,10 @@ Item {
         property int imageId: 0
         anchors {
             fill: parent
-            topMargin: background.margins.top
-            leftMargin: background.margins.left
-            rightMargin: background.margins.right
-            bottomMargin: background.margins.bottom
+            topMargin: background.topMargin
+            leftMargin: background.leftMargin
+            rightMargin: background.rightMargin
+            bottomMargin: background.bottomMargin
         }
         clip: true
         delegate: listDelegate