OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

vnc: allow fall back to RAW encoding

Browse Source 
I have observed that depending on the contents and the encoding it happens
that sending data as RAW sometimes would take less space than the encoded data.
This is especially the case for small updates or areas with high color images.
If sending RAW encoded data is beneficial allow a fall back to RAW encoding
for the framebuffer update.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Peter Lieven 2015-08-27 14:46:25 +02:00 committed by Gerd Hoffmann
parent fb71956367
commit de3f7de7f4
1 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
ui/vnc.c
View File

@ -840,6 +840,8 @@ int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
{
int n = 0;
bool encode_raw = false;
size_t saved_offs = vs->output.offset;
switch(vs->vnc_encoding) {
case VNC_ENCODING_ZLIB:
@ -862,10 +864,24 @@ int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
n = vnc_zywrle_send_framebuffer_update(vs, x, y, w, h);
break;
default:
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_RAW);
n = vnc_raw_send_framebuffer_update(vs, x, y, w, h);
encode_raw = true;
break;
}
/* If the client has the same pixel format as our internal buffer and
* a RAW encoding would need less space fall back to RAW encoding to
* save bandwidth and processing power in the client. */
if (!encode_raw && vs->write_pixels == vnc_write_pixels_copy &&
12 + h * w * VNC_SERVER_FB_BYTES <= (vs->output.offset - saved_offs)) {
vs->output.offset = saved_offs;
encode_raw = true;
}
if (encode_raw) {
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_RAW);
n = vnc_raw_send_framebuffer_update(vs, x, y, w, h);
}
return n;
}