Move background processing into LDesktopBackground class

Generate a QPixmap and use it during paintEvent

1 files changed, 78 insertions, 0 deletions

diff --git a/src-qt5/core/lumina-desktop/LDesktopBackground.cpp b/src-qt5/core/lumina-desktop/LDesktopBackground.cpp
new file mode 100644
index 00000000..bdb6dbab
--- /dev/null
+++ b/src-qt5/core/lumina-desktop/LDesktopBackground.cpp
@@ -0,0 +1,78 @@
+//===========================================
+//  Lumina-DE source code
+//  Copyright (c) 2016, Henry Hu
+//  Available under the 3-clause BSD license
+//  See the LICENSE file for full details
+//===========================================
+#include "LDesktopBackground.h"
+
+#include <QPainter>
+
+void LDesktopBackground::paintEvent(QPaintEvent *pe) {
+    if (bgPixmap != NULL) {
+        QPainter painter(this);
+        painter.setBrush(*bgPixmap);
+        painter.drawRect(0, 0, width(), height());
+    }
+}
+
+void LDesktopBackground::setBackground(const QString& bgFile, const QString& format) {
+    if (bgPixmap != NULL) delete bgPixmap;
+    bgPixmap = new QPixmap(size());
+
+    if (bgFile.startsWith("rgb(")) {
+        QStringList colors = bgFile.section(")",0,0).section("(",1,1).split(",");
+        QColor color = QColor(colors[0].toInt(), colors[1].toInt(), colors[2].toInt());
+        bgPixmap->fill(color);
+    } else {
+        bgPixmap->fill(Qt::black);
+
+        // Load the background file and scale
+        QPixmap bgImage(bgFile);
+        if (format == "stretch" || format == "full" || format == "fit") {
+            Qt::AspectRatioMode mode;
+            if (format == "stretch") {
+                mode = Qt::IgnoreAspectRatio;
+            } else if (format == "full") {
+                mode = Qt::KeepAspectRatioByExpanding;
+            } else {
+                mode = Qt::KeepAspectRatio;
+            }
+            bgImage = bgImage.scaled(size(), mode);
+        }
+
+        // Calculate the offset
+        int dx = 0, dy = 0;
+        int drawWidth = bgImage.width(), drawHeight = bgImage.height();
+        if (format == "fit" || format == "center" || format == "full") {
+            dx = (width() - bgImage.width()) / 2;
+            dy = (height() - bgImage.height()) / 2;
+        } else if (format == "tile") {
+            drawWidth = width();
+            drawHeight = height();
+        } else {
+            if (format.endsWith("right")) {
+                dx = width() - bgImage.width();
+            }
+            if (format.startsWith("bottom")) {
+                dy = height() - bgImage.height();
+            }
+        }
+
+        // Draw the background image
+        QPainter painter(bgPixmap);
+        painter.setBrush(bgImage);
+        painter.setBrushOrigin(dx, dy);
+        painter.drawRect(dx, dy, drawWidth, drawHeight);
+    }
+    update();
+    show();
+}
+
+LDesktopBackground::LDesktopBackground() : QWidget() {
+    bgPixmap = NULL;
+}
+
+LDesktopBackground::~LDesktopBackground() {
+    if (bgPixmap != NULL) delete bgPixmap;
+}