src/plugins/platforms/xcb/qxcbimage.cpp

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  41
  42 #include "qxcbimage.h"
  43 #include <QtGui/QColor>
  44 #include <QtGui/private/qimage_p.h>
  45 #include <QtGui/private/qdrawhelper_p.h>
  46 #ifdef XCB_USE_RENDER
  47 #include <xcb/render.h>
  48 // 'template' is used as a function argument name in xcb_renderutil.h
  49 #define template template_param
  50 // extern "C" is missing too
  51 extern "C" {
  52 #include <xcb/xcb_renderutil.h>
  53 }
  54 #undef template
  55 #endif
  56
  57 QT_BEGIN_NAMESPACE
  58
  59 QImage::Format qt_xcb_imageFormatForVisual(QXcbConnection *connection, uint8_t depth,
  60                                            const xcb_visualtype_t *visual)
  61 {
  62     const xcb_format_t *format = connection->formatForDepth(depth);
  63
  64     if (!visual || !format)
  65         return QImage::Format_Invalid;
  66
  67     if (depth == 32 && format->bits_per_pixel == 32 && visual->red_mask == 0xff0000
  68         && visual->green_mask == 0xff00 && visual->blue_mask == 0xff)
  69         return QImage::Format_ARGB32_Premultiplied;
  70
  71     if (depth == 24 && format->bits_per_pixel == 32 && visual->red_mask == 0xff0000
  72         && visual->green_mask == 0xff00 && visual->blue_mask == 0xff)
  73         return QImage::Format_RGB32;
  74
  75     if (depth == 16 && format->bits_per_pixel == 16 && visual->red_mask == 0xf800
  76         && visual->green_mask == 0x7e0 && visual->blue_mask == 0x1f)
  77         return QImage::Format_RGB16;
  78
  79     return QImage::Format_Invalid;
  80 }
  81
  82 QPixmap qt_xcb_pixmapFromXPixmap(QXcbConnection *connection, xcb_pixmap_t pixmap,
  83                                  int width, int height, int depth,
  84                                  const xcb_visualtype_t *visual)
  85 {
  86     xcb_connection_t *conn = connection->xcb_connection();
  87
  88     xcb_get_image_cookie_t get_image_cookie =
  89         xcb_get_image_unchecked(conn, XCB_IMAGE_FORMAT_Z_PIXMAP, pixmap,
  90                       0, 0, width, height, 0xffffffff);
  91
  92     xcb_get_image_reply_t *image_reply =
  93         xcb_get_image_reply(conn, get_image_cookie, NULL);
  94
  95     if (!image_reply) {
  96         return QPixmap();
  97     }
  98
  99     uint8_t *data = xcb_get_image_data(image_reply);
 100     uint32_t length = xcb_get_image_data_length(image_reply);
 101
 102     QPixmap result;
 103
 104     QImage::Format format = qt_xcb_imageFormatForVisual(connection, depth, visual);
 105     if (format != QImage::Format_Invalid) {
 106         uint32_t bytes_per_line = length / height;
 107         QImage image(const_cast<uint8_t *>(data), width, height, bytes_per_line, format);
 108         uint8_t image_byte_order = connection->setup()->image_byte_order;
 109
 110         // we may have to swap the byte order
 111         if ((QSysInfo::ByteOrder == QSysInfo::LittleEndian && image_byte_order == XCB_IMAGE_ORDER_MSB_FIRST)
 112             || (QSysInfo::ByteOrder == QSysInfo::BigEndian && image_byte_order == XCB_IMAGE_ORDER_LSB_FIRST))
 113         {
 114             for (int i=0; i < image.height(); i++) {
 115                 switch (format) {
 116                 case QImage::Format_RGB16: {
 117                     ushort *p = (ushort*)image.scanLine(i);
 118                     ushort *end = p + image.width();
 119                     while (p < end) {
 120                         *p = ((*p << 8) & 0xff00) | ((*p >> 8) & 0x00ff);
 121                         p++;
 122                     }
 123                     break;
 124                 }
 125                 case QImage::Format_RGB32: // fall-through
 126                 case QImage::Format_ARGB32_Premultiplied: {
 127                     uint *p = (uint*)image.scanLine(i);
 128                     uint *end = p + image.width();
 129                     while (p < end) {
 130                         *p = ((*p << 24) & 0xff000000) | ((*p << 8) & 0x00ff0000)
 131                             | ((*p >> 8) & 0x0000ff00) | ((*p >> 24) & 0x000000ff);
 132                         p++;
 133                     }
 134                     break;
 135                 }
 136                 default:
 137                     Q_ASSERT(false);
 138                 }
 139             }
 140         }
 141
 142         // fix-up alpha channel
 143         if (format == QImage::Format_RGB32) {
 144             QRgb *p = (QRgb *)image.bits();
 145             for (int y = 0; y < height; ++y) {
 146                 for (int x = 0; x < width; ++x)
 147                     p[x] |= 0xff000000;
 148                 p += bytes_per_line / 4;
 149             }
 150         }
 151
 152         result = QPixmap::fromImage(image.copy());
 153     }
 154
 155     free(image_reply);
 156     return result;
 157 }
 158
 159 xcb_pixmap_t qt_xcb_XPixmapFromBitmap(QXcbScreen *screen, const QImage &image)
 160 {
 161     xcb_connection_t *conn = screen->xcb_connection();
 162     QImage bitmap = image.convertToFormat(QImage::Format_MonoLSB);
 163     const QRgb c0 = QColor(Qt::black).rgb();
 164     const QRgb c1 = QColor(Qt::white).rgb();
 165     if (bitmap.color(0) == c0 && bitmap.color(1) == c1) {
 166         bitmap.invertPixels();
 167         bitmap.setColor(0, c1);
 168         bitmap.setColor(1, c0);
 169     }
 170     const int width = bitmap.width();
 171     const int height = bitmap.height();
 172     const int bytesPerLine = bitmap.bytesPerLine();
 173     int destLineSize = width / 8;
 174     if (width % 8)
 175         ++destLineSize;
 176     const uchar *map = bitmap.bits();
 177     uint8_t *buf = new uint8_t[height * destLineSize];
 178     for (int i = 0; i < height; i++)
 179         memcpy(buf + (destLineSize * i), map + (bytesPerLine * i), destLineSize);
 180     xcb_pixmap_t pm = xcb_create_pixmap_from_bitmap_data(conn, screen->root(), buf,
 181                                                          width, height, 1, 0, 0, 0);
 182     delete[] buf;
 183     return pm;
 184 }
 185
 186 xcb_cursor_t qt_xcb_createCursorXRender(QXcbScreen *screen, const QImage &image,
 187                                         const QPoint &spot)
 188 {
 189 #ifdef XCB_USE_RENDER
 190     xcb_connection_t *conn = screen->xcb_connection();
 191     const int w = image.width();
 192     const int h = image.height();
 193     xcb_generic_error_t *error = 0;
 194     xcb_render_query_pict_formats_cookie_t formatsCookie = xcb_render_query_pict_formats(conn);
 195     xcb_render_query_pict_formats_reply_t *formatsReply = xcb_render_query_pict_formats_reply(conn,
 196                                                                                               formatsCookie,
 197                                                                                               &error);
 198     if (!formatsReply || error) {
 199         qWarning("qt_xcb_createCursorXRender: query_pict_formats failed");
 200         free(formatsReply);
 201         free(error);
 202         return XCB_NONE;
 203     }
 204     xcb_render_pictforminfo_t *fmt = xcb_render_util_find_standard_format(formatsReply,
 205                                                                           XCB_PICT_STANDARD_ARGB_32);
 206     if (!fmt) {
 207         qWarning("qt_xcb_createCursorXRender: Failed to find format PICT_STANDARD_ARGB_32");
 208         free(formatsReply);
 209         return XCB_NONE;
 210     }
 211
 212     QImage img = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
 213     xcb_image_t *xi = xcb_image_create(w, h, XCB_IMAGE_FORMAT_Z_PIXMAP,
 214                                        32, 32, 32, 32,
 215                                        QSysInfo::ByteOrder == QSysInfo::BigEndian ? XCB_IMAGE_ORDER_MSB_FIRST : XCB_IMAGE_ORDER_LSB_FIRST,
 216                                        XCB_IMAGE_ORDER_MSB_FIRST,
 217                                        0, 0, 0);
 218     if (!xi) {
 219         qWarning("qt_xcb_createCursorXRender: xcb_image_create failed");
 220         free(formatsReply);
 221         return XCB_NONE;
 222     }
 223     xi->data = (uint8_t *) malloc(xi->stride * h);
 224     if (!xi->data) {
 225         qWarning("qt_xcb_createCursorXRender: Failed to malloc() image data");
 226         xcb_image_destroy(xi);
 227         free(formatsReply);
 228         return XCB_NONE;
 229     }
 230     memcpy(xi->data, img.constBits(), img.byteCount());
 231
 232     xcb_pixmap_t pix = xcb_generate_id(conn);
 233     xcb_create_pixmap(conn, 32, pix, screen->root(), w, h);
 234
 235     xcb_render_picture_t pic = xcb_generate_id(conn);
 236     xcb_render_create_picture(conn, pic, pix, fmt->id, 0, 0);
 237
 238     xcb_gcontext_t gc = xcb_generate_id(conn);
 239     xcb_create_gc(conn, gc, pix, 0, 0);
 240     xcb_image_put(conn, pix, gc, xi, 0, 0, 0);
 241     xcb_free_gc(conn, gc);
 242
 243     xcb_cursor_t cursor = xcb_generate_id(conn);
 244     xcb_render_create_cursor(conn, cursor, pic, spot.x(), spot.y());
 245
 246     free(xi->data);
 247     xcb_image_destroy(xi);
 248     xcb_render_free_picture(conn, pic);
 249     xcb_free_pixmap(conn, pix);
 250     free(formatsReply);
 251     return cursor;
 252
 253 #else
 254     Q_UNUSED(screen);
 255     Q_UNUSED(image);
 256     Q_UNUSED(spot);
 257     return XCB_NONE;
 258 #endif
 259 }
 260
 261 QT_END_NAMESPACE