Cursor support in xcb plug-in.

Custom cursor pixmaps with depth greater than 1 are not yet supported
and will be converted to monochrome always.

Reviewed-by: Samuel Rødal

1 files changed, 180 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbimage.cpp b/src/plugins/platforms/xcb/qxcbimage.cpp
new file mode 100644
index 0000000000..6c8c4e32c8
--- /dev/null
+++ b/src/plugins/platforms/xcb/qxcbimage.cpp
@@ -0,0 +1,180 @@
+/****************************************************************************
+**
+** 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 "qxcbimage.h"
+#include <QtGui/QColor>
+#include <QtGui/private/qimage_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QImage::Format qt_xcb_imageFormatForVisual(QXcbConnection *connection, uint8_t depth,
+                                           const xcb_visualtype_t *visual)
+{
+    const xcb_format_t *format = connection->formatForDepth(depth);
+
+    if (!visual || !format)
+        return QImage::Format_Invalid;
+
+    if (depth == 32 && format->bits_per_pixel == 32 && visual->red_mask == 0xff0000
+        && visual->green_mask == 0xff00 && visual->blue_mask == 0xff)
+        return QImage::Format_ARGB32_Premultiplied;
+
+    if (depth == 24 && format->bits_per_pixel == 32 && visual->red_mask == 0xff0000
+        && visual->green_mask == 0xff00 && visual->blue_mask == 0xff)
+        return QImage::Format_RGB32;
+
+    if (depth == 16 && format->bits_per_pixel == 16 && visual->red_mask == 0xf800
+        && visual->green_mask == 0x7e0 && visual->blue_mask == 0x1f)
+        return QImage::Format_RGB16;
+
+    return QImage::Format_Invalid;
+}
+
+QPixmap qt_xcb_pixmapFromXPixmap(QXcbConnection *connection, xcb_pixmap_t pixmap,
+                                 int width, int height, int depth,
+                                 const xcb_visualtype_t *visual)
+{
+    xcb_connection_t *conn = connection->xcb_connection();
+    xcb_generic_error_t *error = 0;
+
+    xcb_get_image_cookie_t get_image_cookie =
+        xcb_get_image(conn, XCB_IMAGE_FORMAT_Z_PIXMAP, pixmap,
+                      0, 0, width, height, 0xffffffff);
+
+    xcb_get_image_reply_t *image_reply =
+        xcb_get_image_reply(conn, get_image_cookie, &error);
+
+    if (!image_reply) {
+        if (error) {
+            connection->handleXcbError(error);
+            free(error);
+        }
+        return QPixmap();
+    }
+
+    uint8_t *data = xcb_get_image_data(image_reply);
+    uint32_t length = xcb_get_image_data_length(image_reply);
+
+    QPixmap result;
+
+    QImage::Format format = qt_xcb_imageFormatForVisual(connection, depth, visual);
+    if (format != QImage::Format_Invalid) {
+        uint32_t bytes_per_line = length / height;
+        QImage image(const_cast<uint8_t *>(data), width, height, bytes_per_line, format);
+        uint8_t image_byte_order = connection->setup()->image_byte_order;
+
+        // we may have to swap the byte order
+        if ((QSysInfo::ByteOrder == QSysInfo::LittleEndian && image_byte_order == XCB_IMAGE_ORDER_MSB_FIRST)
+            || (QSysInfo::ByteOrder == QSysInfo::BigEndian && image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST))
+        {
+            for (int i=0; i < image.height(); i++) {
+                switch (format) {
+                case QImage::Format_RGB16: {
+                    ushort *p = (ushort*)image.scanLine(i);
+                    ushort *end = p + image.width();
+                    while (p < end) {
+                        *p = ((*p << 8) & 0xff00) | ((*p >> 8) & 0x00ff);
+                        p++;
+                    }
+                    break;
+                }
+                case QImage::Format_RGB32: // fall-through
+                case QImage::Format_ARGB32_Premultiplied: {
+                    uint *p = (uint*)image.scanLine(i);
+                    uint *end = p + image.width();
+                    while (p < end) {
+                        *p = ((*p << 24) & 0xff000000) | ((*p << 8) & 0x00ff0000)
+                            | ((*p >> 8) & 0x0000ff00) | ((*p >> 24) & 0x000000ff);
+                        p++;
+                    }
+                    break;
+                }
+                default:
+                    Q_ASSERT(false);
+                }
+            }
+        }
+
+        // fix-up alpha channel
+        if (format == QImage::Format_RGB32) {
+            QRgb *p = (QRgb *)image.bits();
+            for (int y = 0; y < height; ++y) {
+                for (int x = 0; x < width; ++x)
+                    p[x] |= 0xff000000;
+                p += bytes_per_line / 4;
+            }
+        }
+
+        result = QPixmap::fromImage(image.copy());
+    }
+
+    free(image_reply);
+    return result;
+}
+
+xcb_pixmap_t qt_xcb_XPixmapFromBitmap(QXcbScreen *screen, const QImage &image)
+{
+    xcb_connection_t *conn = screen->xcb_connection();
+    QImage bitmap = image.convertToFormat(QImage::Format_MonoLSB);
+    const QRgb c0 = QColor(Qt::black).rgb();
+    const QRgb c1 = QColor(Qt::white).rgb();
+    if (bitmap.color(0) == c0 && bitmap.color(1) == c1) {
+        bitmap.invertPixels();
+        bitmap.setColor(0, c1);
+        bitmap.setColor(1, c0);
+    }
+    const int width = bitmap.width();
+    const int height = bitmap.height();
+    const int bytesPerLine = bitmap.bytesPerLine();
+    int destLineSize = width / 8;
+    if (width % 8)
+        ++destLineSize;
+    const uchar *map = bitmap.bits();
+    uint8_t *buf = new uint8_t[height * destLineSize];
+    for (int i = 0; i < height; i++)
+        memcpy(buf + (destLineSize * i), map + (bytesPerLine * i), destLineSize);
+    xcb_pixmap_t pm = xcb_create_pixmap_from_bitmap_data(conn, screen->root(), buf,
+                                                         width, height, 1, 0, 0, 0);
+    delete[] buf;
+    return pm;
+}
+
+QT_END_NAMESPACE