QmlDesigner: Generate material browser texture icons using provider

Provider allows using special generation methods for hdr images, which
QImage doesn't support.

Task-number: QDS-8296
Change-Id: I829199264ff4a5eb677d65c908eacd1e20ad94e5
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

share/qtcreator/qmldesigner/materialBrowserQmlSource/TextureItem.qml

@@ -37,7 +37,7 @@ Rectangle {
     }
 
     Image {
-        source: textureSource
+        source: "image://materialBrowserTex/" + textureSource
         sourceSize.width: root.width - 10
         sourceSize.height: root.height - 10
         anchors.centerIn: parent

src/plugins/qmldesigner/components/assetslibrary/assetslibrary.qrc

@@ -1,7 +1,5 @@
 <RCC>
     <qresource prefix="/AssetsLibrary">
-        <file>images/asset_default.png</file>
-        <file>images/asset_default@2x.png</file>
         <file>images/asset_shader.png</file>
         <file>images/asset_shader@2x.png</file>
         <file>images/asset_shader_128.png</file>
@@ -12,5 +10,8 @@
         <file>images/asset_video@2x.png</file>
         <file>images/browse.png</file>
         <file>images/browse@2x.png</file>
+        <file>images/assets_default.png</file>
+        <file>images/assets_default@2x.png</file>
+        <file>images/assets_default_128.png</file>
     </qresource>
 </RCC>

src/plugins/qmldesigner/components/materialbrowser/materialbrowsertexturesmodel.cpp

@@ -35,7 +35,7 @@ QVariant MaterialBrowserTexturesModel::data(const QModelIndex &index, int role)
     QByteArray roleName = roleNames().value(role);
     if (roleName == "textureSource") {
         QString source = m_textureList.at(index.row()).variantProperty("source").value().toString();
-        return QUrl::fromLocalFile(DocumentManager::currentResourcePath().path() + '/' + source);
+        return QVariant(DocumentManager::currentResourcePath().path() + '/' + source);
     }
 
     if (roleName == "textureVisible")

src/plugins/qmldesigner/components/materialbrowser/materialbrowserwidget.cpp

@@ -18,6 +18,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/environment.h>
+#include <utils/hdrimage.h>
 #include <utils/qtcassert.h>
 #include <utils/stylehelper.h>
 
@@ -88,6 +89,33 @@ public:
     }
 };
 
+class TextureImageProvider : public QQuickImageProvider
+{
+public:
+    TextureImageProvider() : QQuickImageProvider(Pixmap) {}
+
+    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize) override
+    {
+        QPixmap pixmap;
+        const QString suffix = id.split('.').last().toLower();
+        if (suffix == "hdr")
+            pixmap = HdrImage{id}.toPixmap();
+        else
+            pixmap = Utils::StyleHelper::dpiSpecificImageFile(id);
+
+        if (pixmap.isNull())
+            pixmap = Utils::StyleHelper::dpiSpecificImageFile(":/materialeditor/images/texture_default.png");
+
+        if (size)
+            *size = pixmap.size();
+
+        if (requestedSize.isValid())
+            return pixmap.scaled(requestedSize, Qt::KeepAspectRatio);
+
+        return pixmap;
+    }
+};
+
 bool MaterialBrowserWidget::eventFilter(QObject *obj, QEvent *event)
 {
     if (event->type() == QEvent::FocusOut) {
@@ -119,8 +147,9 @@ bool MaterialBrowserWidget::eventFilter(QObject *obj, QEvent *event)
                     QString iconPath = QLatin1String("%1/%2")
                                     .arg(DocumentManager::currentResourcePath().path(),
                                          m_textureToDrag.variantProperty("source").value().toString());
-
-                    model->startDrag(mimeData, QPixmap(iconPath).scaled({128, 128}));
+                    model->startDrag(mimeData,
+                                     m_textureImageProvider->requestPixmap(iconPath, nullptr,
+                                                                           {128, 128}));
                 }
                 m_materialToDrag = {};
                 m_textureToDrag = {};
@@ -140,6 +169,7 @@ MaterialBrowserWidget::MaterialBrowserWidget(MaterialBrowserView *view)
     , m_materialBrowserTexturesModel(new MaterialBrowserTexturesModel(this))
     , m_quickWidget(new QQuickWidget(this))
     , m_previewImageProvider(new PreviewImageProvider())
+    , m_textureImageProvider(new TextureImageProvider())
 {
     setWindowTitle(tr("Material Browser", "Title of material browser widget"));
     setMinimumWidth(120);
@@ -160,6 +190,8 @@ MaterialBrowserWidget::MaterialBrowserWidget(MaterialBrowserView *view)
     });
 
     m_quickWidget->engine()->addImageProvider("materialBrowser", m_previewImageProvider);
+    m_quickWidget->engine()->addImageProvider("materialBrowserTex", m_textureImageProvider);
+
     Theme::setupTheme(m_quickWidget->engine());
     m_quickWidget->installEventFilter(this);
 

src/plugins/qmldesigner/components/materialbrowser/materialbrowserwidget.h

@@ -28,6 +28,7 @@ class MaterialBrowserView;
 class MaterialBrowserModel;
 class MaterialBrowserTexturesModel;
 class PreviewImageProvider;
+class TextureImageProvider;
 
 class MaterialBrowserWidget : public QFrame
 {
@@ -70,6 +71,7 @@ private:
 
     QShortcut *m_qmlSourceUpdateShortcut = nullptr;
     PreviewImageProvider *m_previewImageProvider = nullptr;
+    TextureImageProvider *m_textureImageProvider = nullptr;
     Core::IContext *m_context = nullptr;
 
     QString m_filterText;

src/plugins/qmldesigner/components/materialeditor/materialeditor.qrc

@@ -1,5 +1,7 @@
 <RCC>
     <qresource prefix="/materialeditor">
         <file>images/defaultmaterialpreview.png</file>
+        <file>images/texture_default.png</file>
+        <file>images/texture_default@2x.png</file>
     </qresource>
 </RCC>