[app] Synced page image with the background

Delay the update of the background color until the page image has been
rendered.

app/qml/BooksPageView.qml

@@ -1,6 +1,6 @@
 /*
-  Copyright (C) 2015-2021 Jolla Ltd.
+  Copyright (C) 2015-2022 Jolla Ltd.
-  Copyright (C) 2015-2021 Slava Monich <slava.monich@jolla.com>
+  Copyright (C) 2015-2022 Slava Monich <slava.monich@jolla.com>
 
   You may use this file under the terms of BSD license as follows:
 
@@ -40,7 +40,7 @@ import "Books.js" as Books
 Rectangle {
     id: view
 
-    color: Settings.pageBackgroundColor
+    color: widget.backgroundColor
 
     property alias page: widget.page
     property alias bookPos: widget.bookPos

app/src/BooksPageWidget.cpp

@@ -48,7 +48,6 @@
 #include <QPainter>
 
 static const QString IMAGE_URL("image://%1/%2");
-static const int REPAINT_DELAY_MSEC = 250;
 
 // ==========================================================================
 // BooksPageWidget::Data
@@ -534,6 +533,7 @@ BooksPageWidget::BooksPageWidget(QQuickItem* aParent) :
     iSettings(BooksSettings::sharedInstance()),
     iTaskQueue(BooksTaskQueue::defaultQueue()),
     iTextStyle(BooksTextStyle::defaults()),
+    iBackgroundColor(iSettings->pageBackgroundColor()),
     iModel(NULL),
     iResetTask(NULL),
     iRenderTask(NULL),
@@ -647,7 +647,7 @@ BooksPageWidget::onColorsChanged()
 {
     HDEBUG(iPage);
     HASSERT(sender() == iSettings);
-    scheduleRepaintDelayUpdate();
+    scheduleRepaint();
 }
 
 void
@@ -824,22 +824,6 @@ BooksPageWidget::scheduleRepaint()
     }
 }
 
-void
-BooksPageWidget::scheduleRepaintDelayUpdate()
-{
-    BooksLoadingSignalBlocker block(this);
-    cancelRepaint();
-    if (width() > 0 && height() > 0) {
-        if (!iData.isNull() && !iData->iView.isNull()) {
-            (iRenderTask = new RenderTask(iTaskQueue->pool(), thread(),
-                iData, iSettings->colorScheme()))->submit(this,
-                SLOT(onRenderTaskDoneDelayUpdate()));
-        } else if (!iDelayUpdateTimer.isActive()) {
-            iDelayUpdateTimer.start(REPAINT_DELAY_MSEC, this);
-        }
-    }
-}
-
 void
 BooksPageWidget::updateNow()
 {
@@ -862,10 +846,16 @@ BooksPageWidget::onResetTaskDone()
 void
 BooksPageWidget::renderTaskDone()
 {
-    HASSERT(sender() == iRenderTask);
+    RenderTask* task = iRenderTask;
-    iImage = iRenderTask->iImage;
+    HASSERT(sender() == task);
-    iRenderTask->release(this);
     iRenderTask = NULL;
+    iImage = task->iImage;
+    const QColor bg(task->iColors.background());
+    if (iBackgroundColor != bg) {
+        iBackgroundColor = bg;
+        Q_EMIT backgroundColorChanged();
+    }
+    task->release(this);
 }
 
 void
@@ -876,16 +866,6 @@ BooksPageWidget::onRenderTaskDone()
     updateNow();
 }
 
-void
-BooksPageWidget::onRenderTaskDoneDelayUpdate()
-{
-    BooksLoadingSignalBlocker block(this);
-    renderTaskDone();
-    if (!iDelayUpdateTimer.isActive()) {
-        iDelayUpdateTimer.start(REPAINT_DELAY_MSEC, this);
-    }
-}
-
 void
 BooksPageWidget::timerEvent(
     QTimerEvent* aEvent)

app/src/BooksPageWidget.h

@@ -46,6 +46,7 @@
 
 #include <QQuickPaintedItem>
 #include <QBasicTimer>
+#include <QColor>
 #include <QList>
 
 class BooksPageWidget: public QQuickPaintedItem, private BooksLoadingProperty
@@ -61,6 +62,7 @@ class BooksPageWidget: public QQuickPaintedItem, private BooksLoadingProperty
     Q_PROPERTY(int rightMargin READ rightMargin WRITE setRightMargin NOTIFY rightMarginChanged)
     Q_PROPERTY(int topMargin READ topMargin WRITE setTopMargin NOTIFY topMarginChanged)
     Q_PROPERTY(int bottomMargin READ bottomMargin WRITE setBottomMargin NOTIFY bottomMarginChanged)
+    Q_PROPERTY(QColor backgroundColor READ backgroundColor NOTIFY backgroundColorChanged)
     Q_PROPERTY(BooksBookModel* model READ model WRITE setModel NOTIFY modelChanged)
     Q_PROPERTY(BooksPos bookPos READ bookPos WRITE setBookPos NOTIFY bookPosChanged)
 
@@ -83,6 +85,8 @@ public:
     int page() const;
     void setPage(int);
 
+    QColor backgroundColor() const;
+
     BooksBookModel* model() const;
     void setModel(BooksBookModel*);
 
@@ -119,6 +123,7 @@ Q_SIGNALS:
     void rightMarginChanged();
     void topMarginChanged();
     void bottomMarginChanged();
+    void backgroundColorChanged();
     void browserLinkPressed(QString url);
     void imagePressed(QString imageId, QRect rect);
     void activeTouch(int touchX, int touchY);
@@ -134,7 +139,6 @@ private Q_SLOTS:
     void onColorsChanged();
     void onResetTaskDone();
     void onRenderTaskDone();
-    void onRenderTaskDoneDelayUpdate();
     void onClearSelectionTaskDone();
     void onStartSelectionTaskDone();
     void onExtendSelectionTaskDone();
@@ -151,7 +155,6 @@ private:
     void resetView();
     void releaseExtendSelectionTasks();
     void scheduleRepaint();
-    void scheduleRepaintDelayUpdate();
     void cancelRepaint();
     void renderTaskDone();
     void updateNow();
@@ -169,6 +172,7 @@ private:
     shared_ptr<BooksTaskQueue> iTaskQueue;
     shared_ptr<ZLTextStyle> iTextStyle;
     BooksPos iBookPos;
+    QColor iBackgroundColor;
     QBasicTimer iResizeTimer;
     QBasicTimer iDelayUpdateTimer;
     BooksBookModel* iModel;
@@ -203,6 +207,8 @@ inline int BooksPageWidget::page() const
     { return iPage; }
 inline const BooksPos& BooksPageWidget::bookPos() const
     { return iBookPos; }
+inline QColor BooksPageWidget::backgroundColor() const
+    { return iBackgroundColor; }
 inline BooksBookModel* BooksPageWidget::model() const
     { return iModel; }
 inline int BooksPageWidget::leftMargin() const