xref: /OK3568_Linux_fs/buildroot/package/qt5/qt5base/0028-linuxfbdrm-Support-setting-screen-size-and-display-r.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From a710cf924929a1a102b3d07938bd217303e41e93 Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 28 Feb 2022 11:31:12 +0800
Subject: [PATCH 28/28] linuxfbdrm: Support setting screen size and display
 rectangle

Usage:
export QT_QPA_PLATFORM=linuxfb:size=480x200:rect=0,20,480,220

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 .../platforms/linuxfb/qlinuxfbdrmscreen.cpp   | 30 +++++++++++++++++--
 .../platforms/linuxfb/qlinuxfbdrmscreen.h     |  2 ++
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp
index b6e3960d..04df126e 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp
+++ b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp
@@ -416,14 +416,27 @@ void QLinuxFbDevice::swapBuffers(Output *output)
 QLinuxFbDrmScreen::QLinuxFbDrmScreen(const QStringList &args)
     : m_screenConfig(nullptr),
       m_device(nullptr),
-      m_rotation(0)
+      m_rotation(0),
+      m_screenSize(),
+      m_displayRect()
 {
     QRegularExpression rotationRx(QLatin1String("rotation=(0|90|180|270)"));
+    QRegularExpression sizeRx(QLatin1String("size=([1-9]\\d*)x([1-9]\\d*)"));
+    QRegularExpression rectRx(QLatin1String("rect=(\\d+),(\\d+),(\\d+),(\\d+)"));

     for (const QString &arg : qAsConst(args)) {
         QRegularExpressionMatch match;
         if (arg.contains(rotationRx, &match))
             m_rotation = match.captured(1).toInt();
+
+        if (arg.contains(sizeRx, &match))
+            m_screenSize =
+                QSize(match.captured(1).toInt(), match.captured(2).toInt());
+
+        if (arg.contains(rectRx, &match))
+            m_displayRect =
+                QRect(match.captured(1).toInt(), match.captured(2).toInt(),
+                      match.captured(3).toInt(), match.captured(4).toInt());
     }
 }

@@ -451,7 +464,14 @@ bool QLinuxFbDrmScreen::initialize()

     QLinuxFbDevice::Output *output(m_device->output(0));

-    mGeometry = QRect(QPoint(0, 0), output->currentRes());
+    if (m_screenSize.isEmpty())
+        m_screenSize = output->currentRes();
+
+    mGeometry = QRect(QPoint(0, 0), m_screenSize);
+
+    if (m_displayRect.isEmpty())
+        m_displayRect = mGeometry;
+
     if(m_rotation % 180) {
         int tmp = mGeometry.width();
         mGeometry.setWidth(mGeometry.height());
@@ -472,6 +492,9 @@ bool QLinuxFbDrmScreen::initialize()

 QRegion QLinuxFbDrmScreen::doRedraw()
 {
+    qreal scaleX = qreal(m_displayRect.width()) / m_screenSize.width();
+    qreal scaleY = qreal(m_displayRect.height()) / m_screenSize.height();
+
     const QRegion dirty = QFbScreen::doRedraw();
     if (dirty.isEmpty())
         return dirty;
@@ -498,6 +521,9 @@ QRegion QLinuxFbDrmScreen::doRedraw()
     // Do not waste time with the default SourceOver.
     pntr.setCompositionMode(QPainter::CompositionMode_Source);
     for (const QRect &rect : qAsConst(output->dirty[output->backFb])) {
+        pntr.translate(m_displayRect.x(), m_displayRect.y());
+        pntr.scale(scaleX, scaleY);
+
         if(m_rotation) {
             if(m_rotation == 180)
                 pntr.translate(mGeometry.width()/2, mGeometry.height()/2);
diff --git a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h
index 4065392d..679d851b 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h
+++ b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h
@@ -63,6 +63,8 @@ private:
     QLinuxFbDevice *m_device;

     int m_rotation;
+    QSize m_screenSize;
+    QRect m_displayRect;
 };

 QT_END_NAMESPACE
--
2.20.1