xref: /OK3568_Linux_fs/buildroot/package/qt5/qt5base/0014-linuxfb-Support-rotate.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From cc8e902f0511700b797fed870b1a7e6a61e84711 Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 29 Apr 2019 12:11:42 +0800
Subject: [PATCH 14/28] linuxfb: Support rotate

Base on:
https://borkedlabs.com/blog/2015/06-01-qt5-linuxfb-rotation-for-lcds/

Usage:
export QT_QPA_PLATFORM=linuxfb:rotation=90

Conflicts:
    src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
---
 .../platforms/linuxfb/qlinuxfbdrmscreen.cpp   | 33 +++++++++++++++++--
 .../platforms/linuxfb/qlinuxfbdrmscreen.h     |  2 ++
 .../platforms/linuxfb/qlinuxfbscreen.cpp      | 33 ++++++++++++++++---
 .../platforms/linuxfb/qlinuxfbscreen.h        |  2 ++
 4 files changed, 62 insertions(+), 8 deletions(-)

diff --git a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp
index 29d146f4..0c4f6d2c 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp
+++ b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.cpp
@@ -49,6 +49,7 @@
 #include <QLoggingCategory>
 #include <QGuiApplication>
 #include <QPainter>
+#include <QtCore/QRegularExpression>
 #include <QtFbSupport/private/qfbcursor_p.h>
 #include <QtFbSupport/private/qfbwindow_p.h>
 #include <QtKmsSupport/private/qkmsdevice_p.h>
@@ -408,9 +409,16 @@ void QLinuxFbDevice::swapBuffers(Output *output)

 QLinuxFbDrmScreen::QLinuxFbDrmScreen(const QStringList &args)
     : m_screenConfig(nullptr),
-      m_device(nullptr)
+      m_device(nullptr),
+      m_rotation(0)
 {
-    Q_UNUSED(args);
+    QRegularExpression rotationRx(QLatin1String("rotation=(0|90|180|270)"));
+
+    for (const QString &arg : qAsConst(args)) {
+        QRegularExpressionMatch match;
+        if (arg.contains(rotationRx, &match))
+            m_rotation = match.captured(1).toInt();
+    }
 }

 QLinuxFbDrmScreen::~QLinuxFbDrmScreen()
@@ -440,6 +448,12 @@ bool QLinuxFbDrmScreen::initialize()
     QLinuxFbDevice::Output *output(m_device->output(0));

     mGeometry = QRect(QPoint(0, 0), output->currentRes());
+    if(m_rotation % 180) {
+        int tmp = mGeometry.width();
+        mGeometry.setWidth(mGeometry.height());
+        mGeometry.setHeight(tmp);
+    }
+
     mDepth = depthForDrmFormat(output->kmsOutput.drm_format);
     mFormat = formatForDrmFormat(output->kmsOutput.drm_format);
     mPhysicalSize = output->kmsOutput.physical_size;
@@ -475,8 +489,21 @@ QRegion QLinuxFbDrmScreen::doRedraw()
     // Image has alpha but no need for blending at this stage.
     // Do not waste time with the default SourceOver.
     pntr.setCompositionMode(QPainter::CompositionMode_Source);
-    for (const QRect &rect : qAsConst(output->dirty[output->backFb]))
+    for (const QRect &rect : qAsConst(output->dirty[output->backFb])) {
+        if(m_rotation) {
+            if(m_rotation == 180)
+                pntr.translate(mGeometry.width()/2, mGeometry.height()/2);
+            else
+                pntr.translate(mGeometry.height()/2, mGeometry.width()/2);
+
+            pntr.rotate(m_rotation);
+            pntr.translate(-mGeometry.width()/2, -mGeometry.height()/2);
+        }
+
         pntr.drawImage(rect, mScreenImage, rect);
+
+        pntr.resetTransform();
+    }
     pntr.end();

     output->dirty[output->backFb] = QRegion();
diff --git a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h
index 50a95767..4065392d 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h
+++ b/src/plugins/platforms/linuxfb/qlinuxfbdrmscreen.h
@@ -61,6 +61,8 @@ public:
 private:
     QKmsScreenConfig *m_screenConfig;
     QLinuxFbDevice *m_device;
+
+    int m_rotation;
 };

 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
index cb8962d4..40381fcb 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
+++ b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
@@ -287,7 +287,7 @@ static void blankScreen(int fd, bool on)
 }

 QLinuxFbScreen::QLinuxFbScreen(const QStringList &args)
-    : mArgs(args), mFbFd(-1), mTtyFd(-1), mBlitter(0)
+    : mArgs(args), mFbFd(-1), mTtyFd(-1), mBlitter(0), mRotation(0)
 {
     mMmap.data = 0;
 }
@@ -313,6 +313,7 @@ bool QLinuxFbScreen::initialize()
     QRegularExpression mmSizeRx(QLatin1String("mmsize=(\\d+)x(\\d+)"));
     QRegularExpression sizeRx(QLatin1String("size=(\\d+)x(\\d+)"));
     QRegularExpression offsetRx(QLatin1String("offset=(\\d+)x(\\d+)"));
+    QRegularExpression rotationRx(QLatin1String("rotation=(0|90|180|270)"));

     QString fbDevice, ttyDevice;
     QSize userMmSize;
@@ -334,6 +335,8 @@ bool QLinuxFbScreen::initialize()
             ttyDevice = match.captured(1);
         else if (arg.contains(fbRx, &match))
             fbDevice = match.captured(1);
+        else if (arg.contains(rotationRx, &match))
+            mRotation = match.captured(1).toInt();
     }

     if (fbDevice.isEmpty()) {
@@ -372,9 +375,16 @@ bool QLinuxFbScreen::initialize()
     mDepth = determineDepth(vinfo);
     mBytesPerLine = finfo.line_length;
     QRect geometry = determineGeometry(vinfo, userGeometry);
+    QRect originalGeometry = geometry;
+    if(mRotation % 180) {
+        int tmp = geometry.width();
+        geometry.setWidth(geometry.height());
+        geometry.setHeight(tmp);
+    }
+
     mGeometry = QRect(QPoint(0, 0), geometry.size());
     mFormat = determineFormat(vinfo, mDepth);
-    mPhysicalSize = determinePhysicalSize(vinfo, userMmSize, geometry.size());
+    mPhysicalSize = determinePhysicalSize(vinfo, userMmSize, originalGeometry.size());

     // mmap the framebuffer
     mMmap.size = finfo.smem_len;
@@ -384,11 +394,11 @@ bool QLinuxFbScreen::initialize()
         return false;
     }

-    mMmap.offset = geometry.y() * mBytesPerLine + geometry.x() * mDepth / 8;
+    mMmap.offset = originalGeometry.y() * mBytesPerLine + originalGeometry.x() * mDepth / 8;
     mMmap.data = data + mMmap.offset;

     QFbScreen::initializeCompositor();
-    mFbScreenImage = QImage(mMmap.data, geometry.width(), geometry.height(), mBytesPerLine, mFormat);
+    mFbScreenImage = QImage(mMmap.data, originalGeometry.width(), originalGeometry.height(), mBytesPerLine, mFormat);

     mCursor = new QFbCursor(this);

@@ -413,9 +423,22 @@ QRegion QLinuxFbScreen::doRedraw()
         mBlitter = new QPainter(&mFbScreenImage);

     mBlitter->setCompositionMode(QPainter::CompositionMode_Source);
-    for (const QRect &rect : touched)
+    for (const QRect &rect : touched) {
+        if(mRotation) {
+            if(mRotation == 180)
+                mBlitter->translate(mGeometry.width()/2, mGeometry.height()/2);
+            else
+                mBlitter->translate(mGeometry.height()/2, mGeometry.width()/2);
+
+            mBlitter->rotate(mRotation);
+            mBlitter->translate(-mGeometry.width()/2, -mGeometry.height()/2);
+        }
+
         mBlitter->drawImage(rect, mScreenImage, rect);

+        mBlitter->resetTransform();
+    }
+
     return touched;
 }

diff --git a/src/plugins/platforms/linuxfb/qlinuxfbscreen.h b/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
index c7ce455e..70ea02fa 100644
--- a/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
+++ b/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
@@ -75,6 +75,8 @@ private:
     } mMmap;

     QPainter *mBlitter;
+
+    int mRotation;
 };

 QT_END_NAMESPACE
--
2.20.1