Add and use QGLContextPrivate::eglSurfaceForDevice()

The QGLContext only stores the EGLSurface for QWidgets & QGLWidgets,
other device types like QPixmap & QGLPixelBuffer store the surface
themsselves. With this patch it is possible to create a QGLContext
on a QPixmap, make it current and render GL to that QPixmap on X11.

Reviewed-By: TrustMe

1 files changed, 30 insertions, 3 deletions

diff --git a/src/opengl/qgl_egl.cpp b/src/opengl/qgl_egl.cpp
index f1abab8..7bfcf27 100644
--- a/src/opengl/qgl_egl.cpp
+++ b/src/opengl/qgl_egl.cpp
@@ -40,8 +40,14 @@
 ****************************************************************************/
 
 #include <QtOpenGL/qgl.h>
+#include <QtOpenGL/qglpixelbuffer.h>
 #include "qgl_p.h"
 #include "qgl_egl_p.h"
+#include "qglpixelbuffer_p.h"
+
+#ifdef Q_WS_X11
+#include <QtGui/private/qpixmap_x11_p.h>
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -154,12 +160,12 @@ void QGLContext::reset()
 void QGLContext::makeCurrent()
 {
     Q_D(QGLContext);
-    if (!d->valid || !d->eglContext || d->eglSurface == EGL_NO_SURFACE) {
+    if (!d->valid || !d->eglContext || d->eglSurfaceForDevice() == EGL_NO_SURFACE) {
         qWarning("QGLContext::makeCurrent(): Cannot make invalid context current");
         return;
     }
 
-    if (d->eglContext->makeCurrent(d->eglSurface))
+    if (d->eglContext->makeCurrent(d->eglSurfaceForDevice()))
         QGLContextPrivate::setCurrentContext(this);
 }
 
@@ -179,7 +185,7 @@ void QGLContext::swapBuffers() const
     if (!d->valid || !d->eglContext)
         return;
 
-    d->eglContext->swapBuffers(d->eglSurface);
+    d->eglContext->swapBuffers(d->eglSurfaceForDevice());
 }
 
 void QGLContextPrivate::destroyEglSurfaceForDevice()
@@ -202,6 +208,27 @@ void QGLContextPrivate::destroyEglSurfaceForDevice()
     }
 }
 
+EGLSurface QGLContextPrivate::eglSurfaceForDevice() const
+{
+    if (paintDevice->devType() == QInternal::Widget)
+        return eglSurface;
+    if (paintDevice->devType() == QInternal::Pixmap) {
+#ifdef Q_WS_X11
+        QPixmapData *pmd = static_cast<QPixmap*>(paintDevice)->data_ptr().data();
+        if (pmd->classId() == QPixmapData::X11Class) {
+            QX11PixmapData* x11PixmapData = static_cast<QX11PixmapData*>(pmd);
+            return (EGLSurface)x11PixmapData->gl_surface;
+        } else
+#endif
+            return eglSurface;
+    }
+    if (paintDevice->devType() == QInternal::Pbuffer) {
+        QGLPixelBuffer* pbuf = static_cast<QGLPixelBuffer*>(paintDevice);
+        return pbuf->d_func()->pbuf;
+    }
+    return EGL_NO_SURFACE;
+}
+
 void QGLWidget::setMouseTracking(bool enable)
 {
     QWidget::setMouseTracking(enable);