On Tue, Jun 02, 2009 at 11:07:33AM +0200, Pierre Ossman wrote:
> DPI is still a complete mess in X, and I don't see any point in trying
> to create a proper value as we don't have any knowledge of the physical
> screen in VNC. Instead we should try to retain the initial DPI at all
> times as that makes things behave fairly consistent.
>
> This should be in 1.0.
>
> Index: xserver/hw/vnc/xvnc.cc
> ===================================================================
> --- xserver/hw/vnc/xvnc.cc (revision 3829)
> +++ xserver/hw/vnc/xvnc.cc (working copy)
> @@ -991,6 +991,7 @@
> void *pbits;
> Bool ret;
> int oldwidth, oldheight, oldmmWidth, oldmmHeight;
> + int dpix, dpiy;
>
> /* Prevent updates while we fiddle */
> xf86SetRootClip(pScreen, FALSE);
> @@ -1001,12 +1002,18 @@
> oldmmWidth = pScreen->mmWidth;
> oldmmHeight = pScreen->mmHeight;
>
> + /* Compute the current DPI (for use later) */
> + dpix = (pScreen->width * 254 + pScreen->mmWidth * 5) / (pScreen->mmWidth
> * 10);
> + dpiy = (pScreen->height * 254 + pScreen->mmHeight * 5) /
> (pScreen->mmHeight * 10);
> +
> /* Then set the new dimensions */
> pScreen->width = pSize->width;
> pScreen->height = pSize->height;
> - pScreen->mmWidth = pSize->mmWidth;
> - pScreen->mmHeight = pSize->mmHeight;
>
> + /* Try to keep the same DPI as we do not have a physical screen */
> + pScreen->mmWidth = (pScreen->width * 254 + dpix * 5) / (dpix * 10);
> + pScreen->mmHeight = (pScreen->height * 254 + dpiy * 5) / (dpiy * 10);
> +
> /* Allocate a new framebuffer */
> memset(&fb, 0, sizeof(vfbFramebufferInfo));
Hm, patch doesn't look fine for me.
First, we should use same DPI in vfbScreenInit and vncRandRSetConfig
functions. Also I don't understand your magical constants - 254 should
be 25.4, shouldn't it?
I think we should try to be consistent with the bare Xorg. Otherwise
libvnc.so module could have problems.
I suggest this approach:
/* Defined in hw/xfree86/common/xf86Priv.h */
#ifndef DEFAULT_DPI
#define DEFAULT_DPI 96
#endif
if (monitorResolution != 0) {
mmWidth = width * 25.4 / monitorResolution;
mmHeight = height * 25.4 / monitorResolution;
} else {
mmWidth = width * 25.4 / DEFAULT_DPI;
mmHeight = height * 25.4 / DEFAULT_DPI;
}
What is your opinion?
Regards, Adam
--
Adam Tkac, Red Hat, Inc.
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