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From 575490895047e0709bc84826fe6d6a73028d7bbc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@gnome.org>
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Date: Wed, 12 Mar 2014 02:04:13 +0100
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Subject: [PATCH] constraints: Enforce X11 size limits
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X11 limits windows to a maximum of 32767x32767, enforce that restriction
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to keep insanely huge windows from crashing the WM.
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---
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src/core/constraints.c | 42 ++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 42 insertions(+)
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diff --git a/src/core/constraints.c b/src/core/constraints.c
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index 117131b15..379372245 100644
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--- a/src/core/constraints.c
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+++ b/src/core/constraints.c
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@@ -109,6 +109,7 @@ typedef enum
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PRIORITY_TITLEBAR_VISIBLE = 4,
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PRIORITY_PARTIALLY_VISIBLE_ON_WORKAREA = 4,
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PRIORITY_CUSTOM_RULE = 4,
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+ PRIORITY_XLIMITS = 4,
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PRIORITY_MAXIMUM = 4 /* Dummy value used for loop end = max(all priorities) */
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} ConstraintPriority;
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@@ -201,6 +202,10 @@ static gboolean constrain_partially_onscreen (MetaWindow *window,
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ConstraintInfo *info,
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ConstraintPriority priority,
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gboolean check_only);
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+static gboolean constrain_xlimits (MetaWindow *window,
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+ ConstraintInfo *info,
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+ ConstraintPriority priority,
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+ gboolean check_only);
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static void setup_constraint_info (ConstraintInfo *info,
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MetaWindow *window,
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@@ -236,6 +241,7 @@ static const Constraint all_constraints[] = {
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{constrain_fully_onscreen, "constrain_fully_onscreen"},
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{constrain_titlebar_visible, "constrain_titlebar_visible"},
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{constrain_partially_onscreen, "constrain_partially_onscreen"},
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+ {constrain_xlimits, "constrain_xlimits"},
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{NULL, NULL}
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};
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@@ -1780,3 +1786,39 @@ constrain_partially_onscreen (MetaWindow *window,
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return retval;
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}
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+
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+
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+#define MAX_WINDOW_SIZE 32767
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+
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+static gboolean
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+constrain_xlimits (MetaWindow *window,
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+ ConstraintInfo *info,
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+ ConstraintPriority priority,
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+ gboolean check_only)
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+{
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+ int max_w, max_h;
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+ gboolean constraint_already_satisfied;
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+
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+ if (priority > PRIORITY_XLIMITS)
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+ return TRUE;
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+
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+ max_w = max_h = MAX_WINDOW_SIZE;
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+
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+ if (window->frame)
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+ {
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+ MetaFrameBorders borders;
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+ meta_frame_calc_borders (window->frame, &borders);
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+
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+ max_w -= (borders.total.left + borders.total.right);
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+ max_h -= (borders.total.top + borders.total.bottom);
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+ }
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+
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+ constraint_already_satisfied = info->current.width < max_w && info->current.height < max_h;
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+ if (check_only || constraint_already_satisfied)
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+ return constraint_already_satisfied;
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+
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+ info->current.width = MIN (info->current.width, max_w);
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+ info->current.height = MIN (info->current.height, max_h);
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+
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+ return TRUE;
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+}
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--
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2.21.0
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