[Spice-devel] [PATCH win-agent 9/9] Resize to arbitrary resolution

[Alon Levy]

On Fri, May 11, 2012 at 06:39:18PM +0200, Marc-André Lureau wrote:
> Use QXL_ESCAPE_SET_CUSTOM_DISPLAY to update custom mode,
> and switch to it.
> ---
>  vdagent/desktop_layout.cpp |   26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/vdagent/desktop_layout.cpp b/vdagent/desktop_layout.cpp
> index 6e255fc..7564cf6 100644
> --- a/vdagent/desktop_layout.cpp
> +++ b/vdagent/desktop_layout.cpp
> @@ -15,6 +15,7 @@
>     along with this program.  If not, see <http://www.gnu.org/licenses/>.
>  */
>  
> +#include <spice/qxl_windows.h>
>  #include "desktop_layout.h"
>  #include "vdlog.h"
>  
> @@ -240,6 +241,8 @@ bool DesktopLayout::init_dev_mode(LPCTSTR dev_name, DEVMODE* dev_mode, DisplayMo
>  {
>      DWORD closest_diff = -1;
>      DWORD best = -1;
> +    QXLEscapeSetCustomDisplay custom;
> +    HDC hdc = NULL;
>  
>      ZeroMemory(dev_mode, sizeof(DEVMODE));
>      dev_mode->dmSize = sizeof(DEVMODE);
> @@ -248,6 +251,29 @@ bool DesktopLayout::init_dev_mode(LPCTSTR dev_name, DEVMODE* dev_mode, DisplayMo
>          dev_mode->dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_POSITION;
>          return true;
>      }
> +
> +    // Update custom resolution
> +    custom.xres = mode->_width;
> +    custom.yres = mode->_height;
> +    custom.bpp = mode->_depth;
> +    hdc = CreateDC(dev_name, NULL, NULL, NULL);
> +    if (!hdc) {
> +        vd_printf("failed to create DC: %s", dev_name);
> +    } else {
> +        int err = ExtEscape(hdc, QXL_ESCAPE_SET_CUSTOM_DISPLAY,
> +                            sizeof(QXLEscapeSetCustomDisplay), (LPCSTR)&custom, 0, NULL);
> +        if (err <= 0) {
> +            vd_printf("can't set custom display, perhaps an old driver");
> +        }
> +        DeleteDC(hdc);
> +    }
> +
> +    // force refresh mode table
> +    DEVMODE tempDevMode;
> +    ZeroMemory(&tempDevMode, sizeof (tempDevMode));
> +    tempDevMode.dmSize = sizeof(DEVMODE);
> +    EnumDisplaySettings(dev_name, 0xffffff, &tempDevMode);

Missing comment for 0xffffff (you mention this is used to refresh the
modes list earlier).

> +
>      //Find the closest size which will fit within the monitor
>      for (DWORD i = 0; EnumDisplaySettings(dev_name, i, dev_mode); i++) {
>          if (dev_mode->dmPelsWidth > mode->_width ||
> -- 
> 1.7.10.1
> 
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