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constraints: Enforce X11 size limits

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X11 limits windows to a maximum of 32767x32767, enforce that restriction
to keep insanely huge windows from crashing the WM.
This commit is contained in:
Florian Müllner 2014-03-12 02:04:13 +01:00 committed by Ray Strode
parent e9d41e0898
commit 7aed7293e3
1 changed files with 42 additions and 0 deletions
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42
src/core/constraints.c
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@ -106,6 +106,7 @@ typedef enum
PRIORITY_TITLEBAR_VISIBLE = 4, PRIORITY_TITLEBAR_VISIBLE = 4,
PRIORITY_PARTIALLY_VISIBLE_ON_WORKAREA = 4, PRIORITY_PARTIALLY_VISIBLE_ON_WORKAREA = 4,
PRIORITY_CUSTOM_RULE = 4, PRIORITY_CUSTOM_RULE = 4,
PRIORITY_XLIMITS = 4,
PRIORITY_MAXIMUM = 4 /* Dummy value used for loop end = max(all priorities) */ PRIORITY_MAXIMUM = 4 /* Dummy value used for loop end = max(all priorities) */
} ConstraintPriority; } ConstraintPriority;
@ -196,6 +197,10 @@ static gboolean constrain_partially_onscreen (MetaWindow *window,
ConstraintInfo *info, ConstraintInfo *info,
ConstraintPriority priority, ConstraintPriority priority,
gboolean check_only); gboolean check_only);
static gboolean constrain_xlimits (MetaWindow *window,
ConstraintInfo *info,
ConstraintPriority priority,
gboolean check_only);
static void setup_constraint_info (ConstraintInfo *info, static void setup_constraint_info (ConstraintInfo *info,
MetaWindow *window, MetaWindow *window,
@ -231,6 +236,7 @@ static const Constraint all_constraints[] = {
{constrain_fully_onscreen, "constrain_fully_onscreen"}, {constrain_fully_onscreen, "constrain_fully_onscreen"},
{constrain_titlebar_visible, "constrain_titlebar_visible"}, {constrain_titlebar_visible, "constrain_titlebar_visible"},
{constrain_partially_onscreen, "constrain_partially_onscreen"}, {constrain_partially_onscreen, "constrain_partially_onscreen"},
{constrain_xlimits, "constrain_xlimits"},
{NULL, NULL} {NULL, NULL}
}; };
@ -1675,3 +1681,39 @@ constrain_partially_onscreen (MetaWindow *window,
return retval; return retval;
} }
#define MAX_WINDOW_SIZE 32767
static gboolean
constrain_xlimits (MetaWindow *window,
ConstraintInfo *info,
ConstraintPriority priority,
gboolean check_only)
{
int max_w, max_h;
gboolean constraint_already_satisfied;
if (priority > PRIORITY_XLIMITS)
return TRUE;
max_w = max_h = MAX_WINDOW_SIZE;
if (window->frame)
{
MetaFrameBorders borders;
meta_frame_calc_borders (window->frame, &borders);
max_w -= (borders.total.left + borders.total.right);
max_h -= (borders.total.top + borders.total.bottom);
}
constraint_already_satisfied = info->current.width < max_w && info->current.height < max_h;
if (check_only || constraint_already_satisfied)
return constraint_already_satisfied;
info->current.width = MIN (info->current.width, max_w);
info->current.height = MIN (info->current.height, max_h);
return TRUE;
}