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 ZLEwlViewWidget::invertRegion(int x0, int y0, int x1, int y1, bool flush)
{
unsigned int pixel;
for(int i = x0; i <= x1; i++) {
for(int j = y0; j <= y1; j++) {
pixel = 0xffffff & xcb_image_get_pixel(im, i, j);
for(int idx = 0; idx < 4; idx++) {
if(pixel == (0xffffff & pal[idx])) {
xcb_image_put_pixel(im, i, j, pal[3 - idx]);
break;
}
}
}
}
uint8_t send_event;
if(flush)
send_event = 1;
else
send_event = 0;
xcb_image_shm_put (connection, window, gc,
im, shminfo,
x0, y0, x0, y0, x1 - x0, y1 - y0, send_event);
if(flush)
xcb_flush(connection);
}
void ZLEwlViewWidget::doPaint() {
ZLEwlPaintContext &pContext = (ZLEwlPaintContext&)view()->context();
pContext.image = im;
pContext.myWidth = w;
pContext.myHeight = h;
view()->paint();
xcb_image_shm_put (connection, window, gc,
pContext.image, shminfo,
0, 0, 0, 0, w, h, 0);
xcb_flush(connection);
}
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());
if (m_shm_info.shmaddr) {
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);
} else {
// If we upload the whole image in a single chunk, the result might be
// larger than the server's maximum request size and stuff breaks.
// To work around that, we upload the image in chunks where each chunk
// is small enough for a single request.
int src_x = source.x();
int src_y = source.y();
int target_x = target.x();
int target_y = target.y();
int width = source.width();
int height = source.height();
// We must make sure that each request is not larger than max_req_size.
// Each request takes req_size + m_xcb_image->stride * height bytes.
uint32_t max_req_size = xcb_get_maximum_request_length(xcb_connection());
uint32_t req_size = sizeof(xcb_put_image_request_t);
int rows_per_put = (max_req_size - req_size) / m_xcb_image->stride;
// This assert could trigger if a single row has more pixels than fit in
// a single PutImage request. However, max_req_size is guaranteed to be
// at least 16384 bytes. That should be enough for quite large images.
Q_ASSERT(rows_per_put > 0);
while (height > 0) {
int rows = std::min(height, rows_per_put);
xcb_image_t *subimage = xcb_image_subimage(m_xcb_image, src_x, src_y, width, rows,
0, 0, 0);
xcb_image_put(xcb_connection(),
window,
m_gc,
subimage,
target_x,
target_y,
0);
xcb_image_destroy(subimage);
src_y += rows;
target_y += rows;
height -= rows;
}
}
Q_XCB_NOOP(connection());
m_dirty = m_dirty | source;
xcb_flush(xcb_connection());
Q_XCB_NOOP(connection());
}
