Rename QWindowSurface -> QBackingStore and split into platform / public.

Also get rid of GL window surface and related classes.

1 files changed, 284 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbbackingstore.cpp b/src/plugins/platforms/xcb/qxcbbackingstore.cpp
new file mode 100644
index 0000000000..24ec65fb47
--- /dev/null
+++ b/src/plugins/platforms/xcb/qxcbbackingstore.cpp
@@ -0,0 +1,284 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qxcbbackingstore.h"
+
+#include "qxcbconnection.h"
+#include "qxcbscreen.h"
+#include "qxcbwindow.h"
+
+#include <xcb/shm.h>
+#include <xcb/xcb_image.h>
+
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <qdebug.h>
+#include <qpainter.h>
+
+class QXcbShmImage : public QXcbObject
+{
+public:
+    QXcbShmImage(QXcbScreen *connection, const QSize &size, uint depth, QImage::Format format);
+    ~QXcbShmImage() { destroy(); }
+
+    QImage *image() { return &m_qimage; }
+    QSize size() const { return m_qimage.size(); }
+
+    void put(xcb_window_t window, const QPoint &dst, const QRect &source);
+    void preparePaint(const QRegion &region);
+
+private:
+    void destroy();
+
+    xcb_shm_segment_info_t m_shm_info;
+
+    xcb_image_t *m_xcb_image;
+
+    QImage m_qimage;
+
+    xcb_gcontext_t m_gc;
+    xcb_window_t m_gc_window;
+
+    QRegion m_dirty;
+};
+
+QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth, QImage::Format format)
+    : QXcbObject(screen->connection())
+    , m_gc(0)
+    , m_gc_window(0)
+{
+    Q_XCB_NOOP(connection());
+    m_xcb_image = xcb_image_create_native(xcb_connection(),
+                                          size.width(),
+                                          size.height(),
+                                          XCB_IMAGE_FORMAT_Z_PIXMAP,
+                                          depth,
+                                          0,
+                                          ~0,
+                                          0);
+
+    const int segmentSize = m_xcb_image->stride * m_xcb_image->height;
+    if (!segmentSize)
+        return;
+
+    int id = shmget(IPC_PRIVATE, segmentSize, IPC_CREAT | 0777);
+    if (id == -1)
+        qWarning("QXcbShmImage: shmget() failed (%d) for size %d (%dx%d)",
+                 errno, segmentSize, size.width(), size.height());
+    else
+        m_shm_info.shmid = id;
+    m_shm_info.shmaddr = m_xcb_image->data = (quint8 *)shmat (m_shm_info.shmid, 0, 0);
+    m_shm_info.shmseg = xcb_generate_id(xcb_connection());
+
+    xcb_generic_error_t *error = xcb_request_check(xcb_connection(), xcb_shm_attach_checked(xcb_connection(), m_shm_info.shmseg, m_shm_info.shmid, false));
+    if (error) {
+        qWarning() << "QXcbBackingStore: Unable to attach to shared memory segment";
+        free(error);
+    }
+
+    if (shmctl(m_shm_info.shmid, IPC_RMID, 0) == -1)
+        qWarning() << "QXcbBackingStore: Error while marking the shared memory segment to be destroyed";
+
+    m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, format);
+}
+
+void QXcbShmImage::destroy()
+{
+    const int segmentSize = m_xcb_image ? (m_xcb_image->stride * m_xcb_image->height) : 0;
+    if (segmentSize)
+        Q_XCB_CALL(xcb_shm_detach(xcb_connection(), m_shm_info.shmseg));
+
+    xcb_image_destroy(m_xcb_image);
+
+    if (segmentSize) {
+        shmdt(m_shm_info.shmaddr);
+        shmctl(m_shm_info.shmid, IPC_RMID, 0);
+    }
+
+    if (m_gc)
+        Q_XCB_CALL(xcb_free_gc(xcb_connection(), m_gc));
+}
+
+void QXcbShmImage::put(xcb_window_t window, const QPoint &target, const QRect &source)
+{
+    Q_XCB_NOOP(connection());
+    if (m_gc_window != window) {
+        if (m_gc)
+            Q_XCB_CALL(xcb_free_gc(xcb_connection(), m_gc));
+
+        m_gc = xcb_generate_id(xcb_connection());
+        Q_XCB_CALL(xcb_create_gc(xcb_connection(), m_gc, window, 0, 0));
+
+        m_gc_window = window;
+    }
+
+    Q_XCB_NOOP(connection());
+    xcb_image_shm_put(xcb_connection(),
+                      window,
+                      m_gc,
+                      m_xcb_image,
+                      m_shm_info,
+                      source.x(),
+                      source.y(),
+                      target.x(),
+                      target.y(),
+                      source.width(),
+                      source.height(),
+                      false);
+    Q_XCB_NOOP(connection());
+
+    m_dirty = m_dirty | source;
+
+    xcb_flush(xcb_connection());
+    Q_XCB_NOOP(connection());
+}
+
+void QXcbShmImage::preparePaint(const QRegion &region)
+{
+    // to prevent X from reading from the image region while we're writing to it
+    if (m_dirty.intersects(region)) {
+        connection()->sync();
+        m_dirty = QRegion();
+    }
+}
+
+QXcbBackingStore::QXcbBackingStore(QWindow *window)
+    : QPlatformBackingStore(window)
+    , m_image(0)
+    , m_syncingResize(false)
+{
+    QXcbScreen *screen = static_cast<QXcbScreen *>(QPlatformScreen::platformScreenForWindow(window));
+    setConnection(screen->connection());
+}
+
+QXcbBackingStore::~QXcbBackingStore()
+{
+    delete m_image;
+}
+
+QPaintDevice *QXcbBackingStore::paintDevice()
+{
+    return m_image->image();
+}
+
+void QXcbBackingStore::beginPaint(const QRegion &region)
+{
+    m_image->preparePaint(region);
+
+#if 0
+    if (m_image->image()->hasAlphaChannel()) {
+        QPainter p(m_image->image());
+        p.setCompositionMode(QPainter::CompositionMode_Source);
+        const QVector<QRect> rects = region.rects();
+        const QColor blank = Qt::transparent;
+        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it) {
+            p.fillRect(*it, blank);
+        }
+    }
+#endif
+}
+
+void QXcbBackingStore::endPaint(const QRegion &)
+{
+}
+
+void QXcbBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
+{
+    QRect bounds = region.boundingRect();
+
+    if (!m_image || m_image->size().isEmpty())
+        return;
+
+    Q_XCB_NOOP(connection());
+
+    QXcbWindow *platformWindow = static_cast<QXcbWindow *>(window->handle());
+
+    QVector<QRect> rects = region.rects();
+    for (int i = 0; i < rects.size(); ++i)
+        m_image->put(platformWindow->xcb_window(), rects.at(i).topLeft(), rects.at(i).translated(offset));
+
+    Q_XCB_NOOP(connection());
+
+    if (m_syncingResize) {
+        xcb_flush(xcb_connection());
+        connection()->sync();
+        m_syncingResize = false;
+        platformWindow->updateSyncRequestCounter();
+    }
+}
+
+void QXcbBackingStore::resize(const QSize &size, const QRegion &)
+{
+    if (m_image && size == m_image->size())
+        return;
+
+    Q_XCB_NOOP(connection());
+
+    QXcbScreen *screen = static_cast<QXcbScreen *>(QPlatformScreen::platformScreenForWindow(window()));
+    QXcbWindow* win = static_cast<QXcbWindow *>(window()->handle());
+
+    delete m_image;
+    m_image = new QXcbShmImage(screen, size, win->depth(), win->format());
+    Q_XCB_NOOP(connection());
+
+    m_syncingResize = true;
+}
+
+extern void qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset);
+
+bool QXcbBackingStore::scroll(const QRegion &area, int dx, int dy)
+{
+    if (!m_image || m_image->image()->isNull())
+        return false;
+
+    m_image->preparePaint(area);
+
+    const QVector<QRect> rects = area.rects();
+    for (int i = 0; i < rects.size(); ++i)
+        qt_scrollRectInImage(*m_image->image(), rects.at(i), QPoint(dx, dy));
+
+    return true;
+}
+