Make screen rotation work properly with the PowerVR screen driver

Task-number: QT-2261
Reviewed-by: Tom

Back port of 75719e4e06882825fe056935d782b4153bf0ac5b

9 files changed, 162 insertions, 9 deletions

diff --git a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.c b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.c
index ac9dc8d..c1b655a 100644
--- a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.c
+++ b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.c
@@ -617,6 +617,16 @@ void pvrQwsGetGeometry(PvrQwsDrawable *drawable, PvrQwsRect *rect)
     *rect = drawable->rect;
 }
 
+void pvrQwsSetRotation(PvrQwsDrawable *drawable, int angle)
+{
+    if (drawable->rotationAngle != angle) {
+        drawable->rotationAngle = angle;
+
+        /* Force the buffers to be recreated if the rotation angle changes */
+        pvrQwsInvalidateBuffers(drawable);
+    }
+}
+
 int pvrQwsGetStride(PvrQwsDrawable *drawable)
 {
     if (drawable->backBuffersValid)
diff --git a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.h b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.h
index 952ff6f..b9e035f 100644
--- a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.h
+++ b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable.h
@@ -126,6 +126,9 @@ void pvrQwsSetGeometry(PvrQwsDrawable *drawable, const PvrQwsRect *rect);
 /* Get the current geometry for a drawable */
 void pvrQwsGetGeometry(PvrQwsDrawable *drawable, PvrQwsRect *rect);
 
+/* Set the rotation angle in degrees */
+void pvrQwsSetRotation(PvrQwsDrawable *drawable, int angle);
+
 /* Get the line stride for a drawable.  Returns zero if the buffers
    are not allocated or have been invalidated */
 int pvrQwsGetStride(PvrQwsDrawable *drawable);
diff --git a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable_p.h b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable_p.h
index cf80a90..dcd4e4f 100644
--- a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable_p.h
+++ b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwsdrawable_p.h
@@ -114,6 +114,7 @@ struct _PvrQwsDrawable
     int                 isFullScreen;
     int                 strideBytes;
     int                 stridePixels;
+    int                 rotationAngle;
     PvrQwsSwapFunction  swapFunction;
     void               *userData;
     PvrQwsDrawable     *nextWinId;
diff --git a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwswsegl.c b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwswsegl.c
index 253f39f..28b2251 100644
--- a/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwswsegl.c
+++ b/src/plugins/gfxdrivers/powervr/QWSWSEGL/pvrqwswsegl.c
@@ -132,6 +132,16 @@ static WSEGLError wseglCloseDisplay(WSEGLDisplayHandle display)
     return WSEGL_SUCCESS;
 }
 
+static WSEGLRotationAngle wseglRotationValue(int degrees)
+{
+    switch (degrees) {
+    case 90:  return WSEGL_ROTATE_90;
+    case 180: return WSEGL_ROTATE_180;
+    case 270: return WSEGL_ROTATE_270;
+    default:  return WSEGL_ROTATE_0;
+    }
+}
+
 /* Create the WSEGL drawable version of a native window */
 static WSEGLError wseglCreateWindowDrawable
     (WSEGLDisplayHandle display, WSEGLConfig *config,
@@ -152,7 +162,7 @@ static WSEGLError wseglCreateWindowDrawable
         *drawable = (WSEGLDrawableHandle)screen;
         if (!pvrQwsAllocBuffers(screen))
             return WSEGL_OUT_OF_MEMORY;
-        *rotationAngle = WSEGL_ROTATE_0;
+        *rotationAngle = wseglRotationValue(screen->rotationAngle);
         return WSEGL_SUCCESS;
     }
 
@@ -163,7 +173,7 @@ static WSEGLError wseglCreateWindowDrawable
 
     /* The drawable is ready to go */
     *drawable = (WSEGLDrawableHandle)draw;
-    *rotationAngle = WSEGL_ROTATE_0;
+    *rotationAngle = wseglRotationValue(draw->rotationAngle);
     if (!pvrQwsAllocBuffers(draw))
         return WSEGL_OUT_OF_MEMORY;
     return WSEGL_SUCCESS;
diff --git a/src/plugins/gfxdrivers/powervr/README b/src/plugins/gfxdrivers/powervr/README
index 4dce87f..322a6b2 100644
--- a/src/plugins/gfxdrivers/powervr/README
+++ b/src/plugins/gfxdrivers/powervr/README
@@ -51,6 +51,11 @@ on the device with:
 
     hellogl_es -qws
 
+The driver also supports screen rotation if Qt is configured with the
+-qt-gfx-transformed option and the QWS_DISPLAY variable is wrapped in a
+"Transformed" declaration:
+
+    Transformed:powervr:mmWidth40:mmHeight54:Rot90:0
 
 Know Issues:
     * A QGLWidget may not have window decorations if it is a top-level window.
diff --git a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp
index 6696672..2e4c6d1 100644
--- a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp
+++ b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp
@@ -44,6 +44,9 @@
 #include "pvrqwsdrawable_p.h"
 #include <QRegExp>
 #include <qwindowsystem_qws.h>
+#ifndef QT_NO_QWS_TRANSFORMED
+#include <qscreentransformed_qws.h>
+#endif
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <sys/kd.h>
@@ -60,6 +63,7 @@ PvrEglScreen::PvrEglScreen(int displayId)
     ttyfd = -1;
     doGraphicsMode = true;
     oldKdMode = KD_TEXT;
+    parent = 0;
 
     // Make sure that the EGL layer is initialized and the drivers loaded.
     EGLDisplay dpy = eglGetDisplay((EGLNativeDisplayType)EGL_DEFAULT_DISPLAY);
@@ -189,7 +193,7 @@ bool PvrEglScreen::hasOpenGL()
 QWSWindowSurface* PvrEglScreen::createSurface(QWidget *widget) const
 {
     if (qobject_cast<QGLWidget*>(widget))
-        return new PvrEglWindowSurface(widget, (QScreen *)this, displayId);
+        return new PvrEglWindowSurface(widget, (PvrEglScreen *)this, displayId);
 
     return QScreen::createSurface(widget);
 }
@@ -202,6 +206,67 @@ QWSWindowSurface* PvrEglScreen::createSurface(const QString &key) const
     return QScreen::createSurface(key);
 }
 
+#ifndef QT_NO_QWS_TRANSFORMED
+
+static const QScreen *parentScreen
+    (const QScreen *current, const QScreen *lookingFor)
+{
+    if (!current)
+        return 0;
+    switch (current->classId()) {
+    case QScreen::ProxyClass:
+    case QScreen::TransformedClass: {
+        const QScreen *child =
+            static_cast<const QProxyScreen *>(current)->screen();
+        if (child == lookingFor)
+            return current;
+        else
+            return parentScreen(child, lookingFor);
+    }
+    // Not reached.
+
+    case QScreen::MultiClass: {
+        QList<QScreen *> screens = current->subScreens();
+        foreach (QScreen *screen, screens) {
+            if (screen == lookingFor)
+                return current;
+            const QScreen *parent = parentScreen(screen, lookingFor);
+            if (parent)
+                return parent;
+        }
+    }
+    break;
+
+    default: break;
+    }
+    return 0;
+}
+
+int PvrEglScreen::transformation() const
+{
+    // We need to search for our parent screen, which is assumed to be
+    // "Transformed".  If it isn't, then there is no transformation.
+    // There is no direct method to get the parent screen so we need
+    // to search every screen until we find ourselves.
+    if (!parent && qt_screen != this)
+        parent = parentScreen(qt_screen, this);
+    if (!parent)
+        return 0;
+    if (parent->classId() != QScreen::TransformedClass)
+        return 0;
+    return 90 * static_cast<const QTransformedScreen *>(parent)
+                    ->transformation();
+}
+
+#else
+
+int PvrEglScreen::transformation() const
+{
+    return 0;
+}
+
+#endif
+
 void PvrEglScreen::sync()
 {
     // Put code here to synchronize 2D and 3D operations if necessary.
diff --git a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.h b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.h
index 8bf42c7..5769e70 100644
--- a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.h
+++ b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.h
@@ -46,16 +46,18 @@
 #include <QGLScreen>
 #include "pvrqwsdrawable.h"
 
+class PvrEglScreen;
+
 class PvrEglScreenSurfaceFunctions : public QGLScreenSurfaceFunctions
 {
 public:
-    PvrEglScreenSurfaceFunctions(QScreen *s, int screenNum)
+    PvrEglScreenSurfaceFunctions(PvrEglScreen *s, int screenNum)
         : screen(s), displayId(screenNum) {}
 
     bool createNativeWindow(QWidget *widget, EGLNativeWindowType *native);
 
 private:
-    QScreen *screen;
+    PvrEglScreen *screen;
     int displayId;
 };
 
@@ -80,6 +82,8 @@ public:
     QWSWindowSurface* createSurface(QWidget *widget) const;
     QWSWindowSurface* createSurface(const QString &key) const;
 
+    int transformation() const;
+
 private:
     void sync();
     void openTty();
@@ -89,6 +93,7 @@ private:
     int ttyfd, oldKdMode;
     QString ttyDevice;
     bool doGraphicsMode;
+    mutable const QScreen *parent;
 };
 
 #endif
diff --git a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.cpp b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.cpp
index 2c5ac21..4a3787f 100644
--- a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.cpp
+++ b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.cpp
@@ -46,7 +46,7 @@
 #include <QWSDisplay>
 
 PvrEglWindowSurface::PvrEglWindowSurface
-        (QWidget *widget, QScreen *screen, int screenNum)
+        (QWidget *widget, PvrEglScreen *screen, int screenNum)
     : QWSGLWindowSurface(widget)
 {
     setSurfaceFlags(QWSWindowSurface::Opaque);
@@ -63,6 +63,7 @@ PvrEglWindowSurface::PvrEglWindowSurface
     pvrRect.y = pos.y();
     pvrRect.width = size.width();
     pvrRect.height = size.height();
+    transformRects(&pvrRect, 1);
 
     // Try to recover a previous PvrQwsDrawable object for the widget
     // if there is one.  This can happen when a PvrEglWindowSurface
@@ -75,6 +76,7 @@ PvrEglWindowSurface::PvrEglWindowSurface
         pvrQwsSetGeometry(drawable, &pvrRect);
     else
         drawable = pvrQwsCreateWindow(screenNum, (long)widget, &pvrRect);
+    pvrQwsSetRotation(drawable, screen->transformation());
 }
 
 PvrEglWindowSurface::PvrEglWindowSurface()
@@ -113,7 +115,9 @@ void PvrEglWindowSurface::setGeometry(const QRect &rect)
         pvrRect.y = rect.y();
         pvrRect.width = rect.width();
         pvrRect.height = rect.height();
+        transformRects(&pvrRect, 1);
         pvrQwsSetGeometry(drawable, &pvrRect);
+        pvrQwsSetRotation(drawable, screen->transformation());
     }
     QWSGLWindowSurface::setGeometry(rect);
 }
@@ -127,7 +131,9 @@ bool PvrEglWindowSurface::move(const QPoint &offset)
         pvrRect.y = rect.y();
         pvrRect.width = rect.width();
         pvrRect.height = rect.height();
+        transformRects(&pvrRect, 1);
         pvrQwsSetGeometry(drawable, &pvrRect);
+        pvrQwsSetRotation(drawable, screen->transformation());
     }
     return QWSGLWindowSurface::move(offset);
 }
@@ -200,7 +206,9 @@ void PvrEglWindowSurface::setDirectRegion(const QRegion &r, int id)
         pvrRect.y = rect.y();
         pvrRect.width = rect.width();
         pvrRect.height = rect.height();
+        transformRects(&pvrRect, 1);
         pvrQwsSetVisibleRegion(drawable, &pvrRect, 1);
+        pvrQwsSetRotation(drawable, screen->transformation());
         if (!pvrQwsSwapBuffers(drawable, 1))
             screen->solidFill(QColor(0, 0, 0), region);
     } else {
@@ -213,9 +221,53 @@ void PvrEglWindowSurface::setDirectRegion(const QRegion &r, int id)
             pvrRects[index].width = rect.width();
             pvrRects[index].height = rect.height();
         }
+        transformRects(pvrRects, rects.size());
         pvrQwsSetVisibleRegion(drawable, pvrRects, rects.size());
+        pvrQwsSetRotation(drawable, screen->transformation());
         if (!pvrQwsSwapBuffers(drawable, 1))
             screen->solidFill(QColor(0, 0, 0), region);
         delete [] pvrRects;
     }
 }
+
+void PvrEglWindowSurface::transformRects(PvrQwsRect *rects, int count) const
+{
+    switch (screen->transformation()) {
+    case 0: break;
+
+    case 90:
+    {
+        for (int index = 0; index < count; ++index) {
+            int x = rects[index].y;
+            int y = screen->height() - (rects[index].x + rects[index].width);
+            rects[index].x = x;
+            rects[index].y = y;
+            qSwap(rects[index].width, rects[index].height);
+        }
+    }
+    break;
+
+    case 180:
+    {
+        for (int index = 0; index < count; ++index) {
+            int x = screen->width() - (rects[index].x + rects[index].width);
+            int y = screen->height() - (rects[index].y + rects[index].height);
+            rects[index].x = x;
+            rects[index].y = y;
+        }
+    }
+    break;
+
+    case 270:
+    {
+        for (int index = 0; index < count; ++index) {
+            int x = screen->width() - (rects[index].y + rects[index].height);
+            int y = rects[index].x;
+            rects[index].x = x;
+            rects[index].y = y;
+            qSwap(rects[index].width, rects[index].height);
+        }
+    }
+    break;
+    }
+}
diff --git a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.h b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.h
index 58a5fb2..b0a161c 100644
--- a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.h
+++ b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglwindowsurface.h
@@ -45,12 +45,12 @@
 #include <private/qglwindowsurface_qws_p.h>
 #include "pvrqwsdrawable.h"
 
-class QScreen;
+class PvrEglScreen;
 
 class PvrEglWindowSurface : public QWSGLWindowSurface
 {
 public:
-    PvrEglWindowSurface(QWidget *widget, QScreen *screen, int screenNum);
+    PvrEglWindowSurface(QWidget *widget, PvrEglScreen *screen, int screenNum);
     PvrEglWindowSurface();
     ~PvrEglWindowSurface();
 
@@ -76,8 +76,10 @@ public:
 private:
     QWidget *widget;
     PvrQwsDrawable *drawable;
-    QScreen *screen;
+    PvrEglScreen *screen;
     QPaintDevice *pdevice;
+
+    void transformRects(PvrQwsRect *rects, int count) const;
 };
 
 #endif