From db1abe87be5b4bbe7db906ac3d56c69cf3785b23 Mon Sep 17 00:00:00 2001
From: Nick Bowler <nbowler@draconx.ca>
Date: Wed, 6 Jan 2010 10:42:17 -0500
Subject: [PATCH] xfree86: Add DontLie server flag.

Since commit fff00df94d7ebd18a8e24537ec96073717375a3f, RandR 1.2 drivers
lie about the resolution of the attached screen by default.  When the
reported resolution is wrong, fonts and other UI elements that use
physical units are not sized correctly.

This patch adds a new server flag, DontLie, which encourages the server
to be honest by default.

Signed-off-by: Nick Bowler <nbowler@draconx.ca>
---
 hw/xfree86/common/xf86Config.c  |    6 +++++-
 hw/xfree86/common/xf86Globals.c |    1 +
 hw/xfree86/common/xf86Privstr.h |    2 ++
 hw/xfree86/man/xorg.conf.man    |    6 ++++++
 hw/xfree86/modes/xf86RandR12.c  |   12 ++++++++++++
 5 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/hw/xfree86/common/xf86Config.c b/hw/xfree86/common/xf86Config.c
index 114bdc3..22391df 100644
--- a/hw/xfree86/common/xf86Config.c
+++ b/hw/xfree86/common/xf86Config.c
@@ -690,7 +690,8 @@ typedef enum {
     FLAG_AUTO_ENABLE_DEVICES,
     FLAG_GLX_VISUALS,
     FLAG_DRI2,
-    FLAG_USE_SIGIO
+    FLAG_USE_SIGIO,
+    FLAG_DONTLIE
 } FlagValues;
 
 /**
@@ -752,6 +753,8 @@ static OptionInfoRec FlagOptions[] = {
 	{0}, FALSE },
   { FLAG_USE_SIGIO,		"UseSIGIO",			OPTV_BOOLEAN,
 	{0}, FALSE },
+  { FLAG_DONTLIE,		"DontLie",			OPTV_BOOLEAN,
+	{0}, FALSE },
   { -1,				NULL,				OPTV_NONE,
 	{0}, FALSE },
 };
@@ -809,6 +812,7 @@ configServerFlags(XF86ConfFlagsPtr flagsconf, XF86OptionPtr layoutopts)
     xf86GetOptValBool(FlagOptions, FLAG_DONTVTSWITCH, &xf86Info.dontVTSwitch);
     xf86GetOptValBool(FlagOptions, FLAG_DONTZAP, &xf86Info.dontZap);
     xf86GetOptValBool(FlagOptions, FLAG_DONTZOOM, &xf86Info.dontZoom);
+    xf86GetOptValBool(FlagOptions, FLAG_DONTLIE, &xf86Info.dontLie);
 
     xf86GetOptValBool(FlagOptions, FLAG_IGNORE_ABI, &xf86Info.ignoreABI);
     if (xf86Info.ignoreABI) {
diff --git a/hw/xfree86/common/xf86Globals.c b/hw/xfree86/common/xf86Globals.c
index 16d5557..b0f602a 100644
--- a/hw/xfree86/common/xf86Globals.c
+++ b/hw/xfree86/common/xf86Globals.c
@@ -105,6 +105,7 @@ xf86InfoRec xf86Info = {
     .dontVTSwitch               = FALSE,
     .dontZap                    = FALSE,
     .dontZoom                   = FALSE,
+    .dontLie                    = FALSE,
     .notrapSignals              = FALSE,
     .caughtSignal               = FALSE,
     .currentScreen              = NULL,
diff --git a/hw/xfree86/common/xf86Privstr.h b/hw/xfree86/common/xf86Privstr.h
index 608f9bd..d05f206 100644
--- a/hw/xfree86/common/xf86Privstr.h
+++ b/hw/xfree86/common/xf86Privstr.h
@@ -68,6 +68,8 @@ typedef struct {
     Bool		dontVTSwitch;
     Bool		dontZap;
     Bool		dontZoom;
+    Bool		dontLie;
+
     Bool		notrapSignals;	/* don't exit cleanly - die at fault */
     Bool		caughtSignal;
 
diff --git a/hw/xfree86/man/xorg.conf.man b/hw/xfree86/man/xorg.conf.man
index f406f82..a9d418c 100644
--- a/hw/xfree86/man/xorg.conf.man
+++ b/hw/xfree86/man/xorg.conf.man
@@ -544,6 +544,12 @@ When this option is enabled, those key sequences have no special meaning
 and are passed to clients.
 Default: off.
 .TP 7
+.BI "Option \*qDontLie\*q  \*q" boolean \*q
+This option suggests that the server should avoid lying whenever possible.
+Currently this means that RandR 1.2 drivers will try to compute the proper DPI
+instead of making it up.
+Default: off.
+.TP 7
 .BI "Option \*qDisableVidModeExtension\*q  \*q" boolean \*q
 This disables the parts of the VidMode extension used by the xvidtune client
 that can be used to change the video modes.
diff --git a/hw/xfree86/modes/xf86RandR12.c b/hw/xfree86/modes/xf86RandR12.c
index cb20d1c..65da9bf 100644
--- a/hw/xfree86/modes/xf86RandR12.c
+++ b/hw/xfree86/modes/xf86RandR12.c
@@ -805,6 +805,7 @@ xf86RandR12CreateScreenResources (ScreenPtr pScreen)
 	else
 	{
 	    xf86OutputPtr   output = xf86CompatOutput(pScrn);
+	    xf86CrtcPtr     crtc   = output->crtc;
 
 	    if (output &&
 		output->conf_monitor &&
@@ -817,6 +818,17 @@ xf86RandR12CreateScreenResources (ScreenPtr pScreen)
 		mmWidth = output->conf_monitor->mon_width;
 		mmHeight = output->conf_monitor->mon_height;
 	    }
+	    else if (xf86Info.dontLie && crtc && crtc->mode.HDisplay &&
+		     output->mm_width && output->mm_height)
+	    {
+		/*
+		 * If the output has a mode and a declared size, use that
+		 * to scale the screen size
+		 */
+		DisplayModePtr	mode = &crtc->mode;
+		mmWidth = output->mm_width * width / mode->HDisplay;
+		mmHeight = output->mm_height * height / mode->VDisplay;
+	    }
 	    else
 	    {
 		/*
-- 
1.7.3.4