1 files changed, 127 insertions, 0 deletions
diff --git a/src/plugins/platforms/mirclient/qmirclientbackingstore.cpp b/src/plugins/platforms/mirclient/qmirclientbackingstore.cpp
new file mode 100644
index 0000000000..afd7eea936
--- /dev/null
+++ b/src/plugins/platforms/mirclient/qmirclientbackingstore.cpp
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2014 Canonical, Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License version 3, as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
+ * SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qmirclientbackingstore.h"
+#include "qmirclientlogging.h"
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLTexture>
+#include <QtGui/QMatrix4x4>
+#include <QtGui/private/qopengltextureblitter_p.h>
+#include <QtGui/qopenglfunctions.h>
+
+QMirClientBackingStore::QMirClientBackingStore(QWindow* window)
+    : QPlatformBackingStore(window)
+    , mContext(new QOpenGLContext)
+    , mTexture(new QOpenGLTexture(QOpenGLTexture::Target2D))
+    , mBlitter(new QOpenGLTextureBlitter)
+{
+    mContext->setFormat(window->requestedFormat());
+    mContext->setScreen(window->screen());
+    mContext->create();
+
+    window->setSurfaceType(QSurface::OpenGLSurface);
+}
+
+QMirClientBackingStore::~QMirClientBackingStore()
+{
+}
+
+void QMirClientBackingStore::flush(QWindow* window, const QRegion& region, const QPoint& offset)
+{
+    Q_UNUSED(region);
+    Q_UNUSED(offset);
+    mContext->makeCurrent(window);
+    glViewport(0, 0, window->width(), window->height());
+
+    updateTexture();
+
+    if (!mBlitter->isCreated())
+        mBlitter->create();
+
+    mBlitter->bind();
+    mBlitter->setSwizzleRB(true);
+    mBlitter->blit(mTexture->textureId(), QMatrix4x4(), QOpenGLTextureBlitter::OriginTopLeft);
+    mBlitter->release();
+
+    mContext->swapBuffers(window);
+}
+
+void QMirClientBackingStore::updateTexture()
+{
+    if (mDirty.isNull())
+        return;
+
+    if (!mTexture->isCreated()) {
+        mTexture->setMinificationFilter(QOpenGLTexture::Nearest);
+        mTexture->setMagnificationFilter(QOpenGLTexture::Nearest);
+        mTexture->setWrapMode(QOpenGLTexture::ClampToEdge);
+        mTexture->setData(mImage, QOpenGLTexture::DontGenerateMipMaps);
+        mTexture->create();
+    }
+    mTexture->bind();
+
+    QRegion fixed;
+    QRect imageRect = mImage.rect();
+
+    /* Following code taken from QEGLPlatformBackingStore under the terms of the Lesser GPL v2.1 licence
+     * Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). */
+    Q_FOREACH (const QRect &rect, mDirty.rects()) {
+        // intersect with image rect to be sure
+        QRect r = imageRect & rect;
+
+        // if the rect is wide enough it is cheaper to just extend it instead of doing an image copy
+        if (r.width() >= imageRect.width() / 2) {
+            r.setX(0);
+            r.setWidth(imageRect.width());
+        }
+
+        fixed |= r;
+    }
+
+    Q_FOREACH (const QRect &rect, fixed.rects()) {
+        // if the sub-rect is full-width we can pass the image data directly to
+        // OpenGL instead of copying, since there is no gap between scanlines
+        if (rect.width() == imageRect.width()) {
+            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE,
+                            mImage.constScanLine(rect.y()));
+        } else {
+            glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE,
+                            mImage.copy(rect).constBits());
+        }
+    }
+    /* End of code taken from QEGLPlatformBackingStore */
+
+    mDirty = QRegion();
+}
+
+
+void QMirClientBackingStore::beginPaint(const QRegion& region)
+{
+    mDirty |= region;
+}
+
+void QMirClientBackingStore::resize(const QSize& size, const QRegion& /*staticContents*/)
+{
+    mImage = QImage(size, QImage::Format_RGB32);
+
+    if (mTexture->isCreated())
+        mTexture->destroy();
+}
+
+QPaintDevice* QMirClientBackingStore::paintDevice()
+{
+    return &mImage;
+}