FusionStyle: re-add icons for dockwidget titlebar

Re-add the icon for dockwidget titlebars as png images in different
resolutions to avoid a blurry icon on high-dpi displays. Also add the
source svg.

Task-number: QTBUG-118122
Task-number: QTBUG-118643
Change-Id: I24f710e3c7390762c7079c0e153f015475347591
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

24 files changed, 328 insertions, 0 deletions

diff --git a/src/widgets/CMakeLists.txt b/src/widgets/CMakeLists.txt
index 9b0a270320..f77117dc56 100644
--- a/src/widgets/CMakeLists.txt
+++ b/src/widgets/CMakeLists.txt
@@ -327,6 +327,36 @@ qt_internal_add_resource(Widgets "qstyle1"
         ${qstyle1_resource_files}
 )
 
+set(qstyle_resource_fusion_files
+    "styles/images/fusion_closedock-10.png"
+    "styles/images/fusion_closedock-16.png"
+    "styles/images/fusion_closedock-20.png"
+    "styles/images/fusion_closedock-32.png"
+    "styles/images/fusion_closedock-48.png"
+    "styles/images/fusion_closedock-64.png"
+    "styles/images/fusion_normalizedockup_10.png"
+    "styles/images/fusion_normalizedockup-16.png"
+    "styles/images/fusion_normalizedockup_20.png"
+    "styles/images/fusion_normalizedockup-32.png"
+    "styles/images/fusion_normalizedockup_48.png"
+    "styles/images/fusion_normalizedockup_64.png"
+    "styles/images/fusion_titlebar-min-10.png"
+    "styles/images/fusion_titlebar-min-16.png"
+    "styles/images/fusion_titlebar-min-20.png"
+    "styles/images/fusion_titlebar-min-32.png"
+    "styles/images/fusion_titlebar-min-48.png"
+    "styles/images/fusion_titlebar-min-64.png"
+)
+
+qt_internal_add_resource(Widgets "qstyle_fusion"
+    PREFIX
+        "/qt-project.org/styles/fusionstyle"
+    BASE
+        "styles"
+    FILES
+        ${qstyle_resource_fusion_files}
+)
+
 if(QT_FEATURE_reduce_relocations AND UNIX AND GCC)
     target_link_options(Widgets PRIVATE
                         "LINKER:--dynamic-list=${CMAKE_CURRENT_LIST_DIR}/QtWidgets.dynlist")
diff --git a/src/widgets/styles/images/fusion_closedock-10.png b/src/widgets/styles/images/fusion_closedock-10.png
new file mode 100644
index 0000000000..c364f0a8b2
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock-10.png
diff --git a/src/widgets/styles/images/fusion_closedock-16.png b/src/widgets/styles/images/fusion_closedock-16.png
new file mode 100644
index 0000000000..e3906770a1
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock-16.png
diff --git a/src/widgets/styles/images/fusion_closedock-20.png b/src/widgets/styles/images/fusion_closedock-20.png
new file mode 100644
index 0000000000..867acbe4a3
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock-20.png
diff --git a/src/widgets/styles/images/fusion_closedock-32.png b/src/widgets/styles/images/fusion_closedock-32.png
new file mode 100644
index 0000000000..6bfa5606f4
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock-32.png
diff --git a/src/widgets/styles/images/fusion_closedock-48.png b/src/widgets/styles/images/fusion_closedock-48.png
new file mode 100644
index 0000000000..d0215be922
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock-48.png
diff --git a/src/widgets/styles/images/fusion_closedock-64.png b/src/widgets/styles/images/fusion_closedock-64.png
new file mode 100644
index 0000000000..43ab9561f1
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock-64.png
diff --git a/src/widgets/styles/images/fusion_closedock.svg b/src/widgets/styles/images/fusion_closedock.svg
new file mode 100644
index 0000000000..627c6e35df
--- /dev/null
+++ b/src/widgets/styles/images/fusion_closedock.svg
@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   width="8px"
+   height="8px"
+   viewBox="0 0 8 8"
+   style="enable-background:new 0 0 8 8;"
+   xml:space="preserve"
+   sodipodi:docname="fusion_closedock.svg"
+   inkscape:version="1.0.1 (3bc2e813f5, 2020-09-07)"
+   inkscape:export-filename="/home/chehrlic/kde/qt.src/qtbase/src/widgets/styles/images/fusion_closedock-64.png"
+   inkscape:export-xdpi="768"
+   inkscape:export-ydpi="768"><metadata
+   id="metadata120"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title /></cc:Work></rdf:RDF></metadata><defs
+   id="defs118">
+	
+	
+
+		
+		
+	</defs><sodipodi:namedview
+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="1920"
+   inkscape:window-height="918"
+   id="namedview116"
+   showgrid="false"
+   inkscape:zoom="63.727999"
+   inkscape:cx="5.1718865"
+   inkscape:cy="4.7238684"
+   inkscape:window-x="0"
+   inkscape:window-y="0"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="Layer_1"
+   inkscape:document-rotation="0" />
+<style
+   type="text/css"
+   id="style101">
+	.st0{fill:none;}
+	.st1{fill:#353637;}
+</style>
+<g
+   id="g105">
+		<rect
+   class="st0"
+   width="8"
+   height="8"
+   id="rect103"
+   x="0"
+   y="0" />
+	</g>
+<g
+   id="g981"><rect
+     x="5.1188383"
+     y="-2.9975181"
+     transform="rotate(45.000001)"
+     class="st1"
+     width="1.0760319"
+     height="5.9950356"
+     id="rect107"
+     style="stroke-width:0.768594;fill:#6c6a67;fill-opacity:1" /><rect
+     x="-0.53801638"
+     y="-8.6545134"
+     transform="rotate(135)"
+     class="st1"
+     width="1.0760319"
+     height="5.9950356"
+     id="rect109"
+     style="stroke-width:0.768594;fill:#6c6a67;fill-opacity:1" /><rect
+     style="fill:none;stroke:#6c6a67;stroke-width:0.469731;stroke-linejoin:bevel;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+     id="rect151"
+     width="6.5302691"
+     height="6.5302691"
+     x="0.73486549"
+     y="0.73486549" /></g></svg>
diff --git a/src/widgets/styles/images/fusion_normalizedockup-16.png b/src/widgets/styles/images/fusion_normalizedockup-16.png
new file mode 100644
index 0000000000..6154747952
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup-16.png
diff --git a/src/widgets/styles/images/fusion_normalizedockup-32.png b/src/widgets/styles/images/fusion_normalizedockup-32.png
new file mode 100644
index 0000000000..d9d81af3eb
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup-32.png
diff --git a/src/widgets/styles/images/fusion_normalizedockup.svg b/src/widgets/styles/images/fusion_normalizedockup.svg
new file mode 100644
index 0000000000..c422036842
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup.svg
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   width="8px"
+   height="8px"
+   viewBox="0 0 8 8"
+   style="enable-background:new 0 0 8 8;"
+   xml:space="preserve"
+   sodipodi:docname="fusion_normalizedockup.svg"
+   inkscape:version="1.0.1 (3bc2e813f5, 2020-09-07)"
+   inkscape:export-filename="/home/chehrlic/kde/qt.src/qtbase/src/widgets/styles/images/fusion_normalizedockup_64.png"
+   inkscape:export-xdpi="768"
+   inkscape:export-ydpi="768"><metadata
+   id="metadata120"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title /></cc:Work></rdf:RDF></metadata><defs
+   id="defs118">
+	
+	
+
+		
+		
+	</defs><sodipodi:namedview
+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="1920"
+   inkscape:window-height="918"
+   id="namedview116"
+   showgrid="false"
+   inkscape:zoom="63.727999"
+   inkscape:cx="3.979318"
+   inkscape:cy="4.7238684"
+   inkscape:window-x="0"
+   inkscape:window-y="0"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="Layer_1"
+   inkscape:document-rotation="0" />
+<style
+   type="text/css"
+   id="style101">
+	.st0{fill:none;}
+	.st1{fill:#353637;}
+</style>
+<g
+   id="g105">
+		<rect
+   class="st0"
+   width="8"
+   height="8"
+   id="rect103"
+   x="0"
+   y="0" />
+	</g>
+<rect
+   style="fill:none;stroke:#6c6a67;stroke-width:0.469731;stroke-linejoin:bevel;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+   id="rect151"
+   width="6.5302691"
+   height="6.5302691"
+   x="0.73486549"
+   y="0.73486549" /><g
+   id="g1123"
+   transform="matrix(0.85891433,0,0,0.86643038,0.5610817,0.55019701)"><path
+     id="rect151-3-6"
+     style="fill:none;stroke:#6c6a67;stroke-width:0.5;stroke-linejoin:bevel;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+     d="m 2.6347656,1.6347656 v 1 h 2.7304688 v 2.7304688 h 1 V 1.6347656 Z" /><path
+     style="fill:none;fill-opacity:1;stroke:#6c6a67;stroke-width:0.5;stroke-linejoin:bevel;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+     d="M 1.634209,2.6342089 H 5.3657907 V 6.3657906 H 1.634209 Z"
+     id="rect151-3" /></g></svg>
diff --git a/src/widgets/styles/images/fusion_normalizedockup_10.png b/src/widgets/styles/images/fusion_normalizedockup_10.png
new file mode 100644
index 0000000000..02c453563c
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup_10.png
diff --git a/src/widgets/styles/images/fusion_normalizedockup_20.png b/src/widgets/styles/images/fusion_normalizedockup_20.png
new file mode 100644
index 0000000000..c3042b04d6
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup_20.png
diff --git a/src/widgets/styles/images/fusion_normalizedockup_48.png b/src/widgets/styles/images/fusion_normalizedockup_48.png
new file mode 100644
index 0000000000..d22f414063
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup_48.png
diff --git a/src/widgets/styles/images/fusion_normalizedockup_64.png b/src/widgets/styles/images/fusion_normalizedockup_64.png
new file mode 100644
index 0000000000..e9bd907f90
--- /dev/null
+++ b/src/widgets/styles/images/fusion_normalizedockup_64.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min-10.png b/src/widgets/styles/images/fusion_titlebar-min-10.png
new file mode 100644
index 0000000000..c0e13fb3eb
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min-10.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min-16.png b/src/widgets/styles/images/fusion_titlebar-min-16.png
new file mode 100644
index 0000000000..7030dfd3d4
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min-16.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min-20.png b/src/widgets/styles/images/fusion_titlebar-min-20.png
new file mode 100644
index 0000000000..0f7cfa3a1e
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min-20.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min-32.png b/src/widgets/styles/images/fusion_titlebar-min-32.png
new file mode 100644
index 0000000000..e7764ca294
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min-32.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min-48.png b/src/widgets/styles/images/fusion_titlebar-min-48.png
new file mode 100644
index 0000000000..0d4d1f8ca4
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min-48.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min-64.png b/src/widgets/styles/images/fusion_titlebar-min-64.png
new file mode 100644
index 0000000000..84923f04ca
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min-64.png
diff --git a/src/widgets/styles/images/fusion_titlebar-min.svg b/src/widgets/styles/images/fusion_titlebar-min.svg
new file mode 100644
index 0000000000..353df2874f
--- /dev/null
+++ b/src/widgets/styles/images/fusion_titlebar-min.svg
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   width="8px"
+   height="8px"
+   viewBox="0 0 8 8"
+   style="enable-background:new 0 0 8 8;"
+   xml:space="preserve"
+   sodipodi:docname="fusion_titlebar-min.svg"
+   inkscape:version="1.0.1 (3bc2e813f5, 2020-09-07)"
+   inkscape:export-filename="/home/chehrlic/kde/qt.src/qtbase/src/widgets/styles/images/fusion_titlebar-min-64.png"
+   inkscape:export-xdpi="768"
+   inkscape:export-ydpi="768"><metadata
+   id="metadata120"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+   id="defs118">
+	
+	
+
+		
+		
+	</defs><sodipodi:namedview
+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="1920"
+   inkscape:window-height="918"
+   id="namedview116"
+   showgrid="false"
+   inkscape:zoom="45.0625"
+   inkscape:cx="-0.80217757"
+   inkscape:cy="6.6858335"
+   inkscape:window-x="0"
+   inkscape:window-y="0"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="Layer_1" />
+<style
+   type="text/css"
+   id="style101">
+	.st0{fill:none;}
+	.st1{fill:#353637;}
+</style>
+<g
+   id="g105">
+		<rect
+   class="st0"
+   width="8"
+   height="8"
+   id="rect103"
+   x="0"
+   y="0" />
+	</g>
+<rect
+   style="fill:#6c6a67;fill-opacity:1;stroke:none;stroke-width:0.529435;stroke-linejoin:bevel;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+   id="rect1157"
+   width="5.5"
+   height="1.5"
+   x="1"
+   y="5.5" /></svg>
diff --git a/src/widgets/styles/qfusionstyle.cpp b/src/widgets/styles/qfusionstyle.cpp
index a569529afb..7e88541cb2 100644
--- a/src/widgets/styles/qfusionstyle.cpp
+++ b/src/widgets/styles/qfusionstyle.cpp
@@ -3635,9 +3635,47 @@ QRect QFusionStyle::subElementRect(SubElement sr, const QStyleOption *opt, const
 /*!
     \reimp
 */
+QIcon QFusionStyle::iconFromTheme(StandardPixmap standardIcon) const
+{
+    QIcon icon;
+#if QT_CONFIG(imageformat_png)
+    auto addIconFiles = [](QStringView prefix, QIcon &icon)
+    {
+        const auto fullPrefix = QStringLiteral(":/qt-project.org/styles/fusionstyle/images/") + prefix;
+        static constexpr auto dockTitleIconSizes = {10, 16, 20, 32, 48, 64};
+        for (int size : dockTitleIconSizes)
+            icon.addFile(fullPrefix + QString::number(size) + QStringLiteral(".png"),
+                         QSize(size, size));
+    };
+    switch (standardIcon) {
+    case SP_TitleBarNormalButton:
+        addIconFiles(u"fusion_normalizedockup-", icon);
+      break;
+    case SP_TitleBarMinButton:
+        addIconFiles(u"fusion_titlebar-min-", icon);
+        break;
+    case SP_TitleBarCloseButton:
+    case SP_DockWidgetCloseButton:
+        addIconFiles(u"fusion_closedock-", icon);
+        break;
+    default:
+        break;
+    }
+#else  // imageformat_png
+    Q_UNUSED(standardIcon);
+#endif // imageformat_png
+    return icon;
+}
+
+/*!
+    \reimp
+*/
 QIcon QFusionStyle::standardIcon(StandardPixmap standardIcon, const QStyleOption *option,
                                  const QWidget *widget) const
 {
+    const auto icon = iconFromTheme(standardIcon);
+    if (!icon.availableSizes().isEmpty())
+        return icon;
     return QCommonStyle::standardIcon(standardIcon, option, widget);
 }
 
@@ -3647,6 +3685,13 @@ QIcon QFusionStyle::standardIcon(StandardPixmap standardIcon, const QStyleOption
 QPixmap QFusionStyle::standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt,
                                      const QWidget *widget) const
 {
+    auto getDevicePixelRatio = [](const QWidget *widget)
+    {
+        return widget ? widget->devicePixelRatio() : qApp->devicePixelRatio();
+    };
+    const auto icon = iconFromTheme(standardPixmap);
+    if (!icon.availableSizes().isEmpty())
+        return icon.pixmap(QSize(16, 16), getDevicePixelRatio(widget));
     return QCommonStyle::standardPixmap(standardPixmap, opt, widget);
 }
 
diff --git a/src/widgets/styles/qfusionstyle_p.h b/src/widgets/styles/qfusionstyle_p.h
index d2a2e16b12..7dfeb34d7c 100644
--- a/src/widgets/styles/qfusionstyle_p.h
+++ b/src/widgets/styles/qfusionstyle_p.h
@@ -54,6 +54,7 @@ public:
     int styleHint(StyleHint hint, const QStyleOption *option = nullptr, const QWidget *widget = nullptr,
                   QStyleHintReturn *returnData = nullptr) const override;
     QRect itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const override;
+    QIcon iconFromTheme(StandardPixmap standardIcon) const;
     QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option = nullptr,
                        const QWidget *widget = nullptr) const override;
     QPixmap standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt,