qt5 旋转（.patch文件源码）

【核心代码】

diff --git a/src.orig/plugins/platforms/linuxfb/qlinuxfbscreen.cpp b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
index a66c9fa..a5b5f13 100644
--- a/src.orig/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
    b/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp
@@ -290,7  290,7 @@ static void blankScreen(int fd, bool on)
 }
 
 QLinuxFbScreen::QLinuxFbScreen(const QStringList &args)
-    : mArgs(args), mFbFd(-1), mBlitter(0)
     : mArgs(args), mFbFd(-1), mBlitter(0), mRotation(90)
 {
 }
 
@@ -316,6  316,7 @@ 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;
@@ -337,6  338,8 @@ 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()) {
@@ -375,9  378,17 @@ bool QLinuxFbScreen::initialize()
     mDepth = determineDepth(vinfo);
     mBytesPerLine = finfo.line_length;
     QRect geometry = determineGeometry(vinfo, userGeometry);
     QRect originalGeometry = geometry;
     if( mRotation == 90 || mRotation == 270 )
     {
         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;
@@ -387,11  398,11 @@ 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);
 
     QByteArray hideCursorVal = qgetenv("QT_QPA_FB_HIDECURSOR");
 #if !defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK)
@@ -436,7  447,26 @@ QRegion QLinuxFbScreen::doRedraw()
 
     QVector<QRect> rects = touched.rects();
     for (int i = 0; i < rects.size(); i  )
     {
         if( mRotation == 90 || mRotation == 270 )
         {
             mBlitter->translate(mGeometry.height()/2, mGeometry.width()/2);
         }
         else if( mRotation == 180 )
         {
             mBlitter->translate(mGeometry.width()/2, mGeometry.height()/2);
         }
 
         if( mRotation != 0 )
         {
             mBlitter->rotate(mRotation);
             mBlitter->translate(-mGeometry.width()/2, -mGeometry.height()/2);
         }
 
         mBlitter->drawImage(rects[i], *mScreenImage, rects[i]);
 
         mBlitter->resetTransform();
     }
     return touched;
 }
 
diff --git a/src.orig/plugins/platforms/linuxfb/qlinuxfbscreen.h b/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
index 1997d46..a34414f 100644
--- a/src.orig/plugins/platforms/linuxfb/qlinuxfbscreen.h
    b/src/plugins/platforms/linuxfb/qlinuxfbscreen.h
@@ -57,6  57,7 @@ private:
     QStringList mArgs;
     int mFbFd;
     int mTtyFd;
     int mRotation;
 
     QImage mFbScreenImage;
     int mBytesPerLine;