[Qemu-devel] [PATCH/RFC 0/7] Screendump to UNIX socket & in PNG format

[Marc-André Lureau]

Hi,

The current screendump command can only save to disk very large PPM files.

The following patches add support for screendump in a UNIX socket, following 
the syntax used for migration URI: "unix:/path/to/socket". 

The last 3 patches add support for dumping in PNG format. This can reduce the 
size of the image by a great factor (x10 is not unusual), and is also a more 
convenient format than PPM. Currently, it dumps in PNG by checking if the path 
ends with ".png", we may want to have a seperate option for that instead, or 
use this syntax only if the path begins with "unix:" (or any foo:) for example.

Next, I would like to add support for a scaling factor too (a typical use case 
is to show a small thumbnail of the desktop). Specifying only the requested 
"width" or "height" should be supported. Should we rely on pixman to do this 
work?

Finally, those functions should not be blocking. With a bit of guidance, I 
could work on a follow-up patch adding support for it, but for now there are 
related work still in discussion (screendump-async etc.) and I thought it was 
best to avoid.

regards

Marc-André Lureau (7):
  ppm_save: use QEMUFile
  Allow a qemu_fopen_socket() to be opened for writing
  Close socket when closing QEMUFile
  Allow saving screendump to a UNIX socket
  configure: split PNG support from vnc_png feature
  Isolate color conversion from PPM handling
  Add PNG screendump

 Makefile.target  |    2 +-
 configure        |   42 +++++++++---
 hw/vga.c         |  197 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 migration-tcp.c  |   11 ++--
 migration-unix.c |   11 ++--
 qemu-file.h      |    3 +-
 savevm.c         |   37 +++++++++-
 7 files changed, 260 insertions(+), 43 deletions(-)

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1.7.7.6