Re: [PATCH v2 2/2] Added parameter to take screenshot with screendump as PNG

[Daniel P . Berrangé]

On Tue, Mar 22, 2022 at 10:49:53AM +0000, Kshitij Suri wrote:
> Currently screendump only supports PPM format, which is un-compressed and not
> standard. Added a "format" parameter to qemu monitor screendump capabilites
> to support PNG image capture using libpng. The param was added in QAPI schema
> of screendump present in ui.json along with png_save() function which converts
> pixman_image to PNG. HMP command equivalent was also modified to support the
> feature.
> 
> Example usage:
> { "execute": "screendump", "arguments": { "filename": "/tmp/image",
> "format":"png" } }
> 
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/718
> 
> Signed-off-by: Kshitij Suri <kshitij.suri@nutanix.com>
> ---
> diff to v1:
>   - Removed repeated alpha conversion operation.
>   - Modified logic to mirror png conversion in vnc-enc-tight.c file.
>   - Added a new CONFIG_PNG parameter for libpng support.
>   - Changed input format to enum instead of string.
>   - Improved error handling.
>  hmp-commands.hx    |  11 ++---
>  monitor/hmp-cmds.c |  12 +++++-
>  qapi/ui.json       |  24 +++++++++--
>  ui/console.c       | 101 +++++++++++++++++++++++++++++++++++++++++++--
>  4 files changed, 136 insertions(+), 12 deletions(-)


> diff --git a/qapi/ui.json b/qapi/ui.json
> index 664da9e462..e8060d6b3c 100644
> --- a/qapi/ui.json
> +++ b/qapi/ui.json
> @@ -157,12 +157,27 @@
>  ##
>  { 'command': 'expire_password', 'boxed': true, 'data': 
> 'ExpirePasswordOptions' }
>  
> +##
> +# @ImageFormat:
> +#
> +# Supported image format types.
> +#
> +# @png: PNG format
> +#
> +# @ppm: PPM format
> +#
> +# Since: 7.0

This will probably end up being 7.1 at this point.

> +#
> +##
> +{ 'enum': 'ImageFormat',
> +  'data': ['ppm', 'png'] }
> +
>  ##
>  # @screendump:
>  #
> -# Write a PPM of the VGA screen to a file.
> +# Capture the contents of a screen and write it to a file.
>  #
> -# @filename: the path of a new PPM file to store the image
> +# @filename: the path of a new file to store the image
>  #
>  # @device: ID of the display device that should be dumped. If this parameter
>  #          is missing, the primary display will be used. (Since 2.12)
> @@ -171,6 +186,8 @@
>  #        parameter is missing, head #0 will be used. Also note that the head
>  #        can only be specified in conjunction with the device ID. (Since 
> 2.12)
>  #
> +# @format: image format for screendump is specified. (default: ppm) (Since 
> 7.0)

Likewise probably 7.1


None the less,

  Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>



With regards,
Daniel
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