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mutter-performance-source/src/core/iconcache.c
Owen W. Taylor 82db52aaf4 iconcache: don't crash on a non-alpha mask pixmap 
We assume when applying a mask that it is a depth-1 pixmap that
cairo interprets as alpha. So ignore a non-depth-1 mask.

https://bugzilla.gnome.org/show_bug.cgi?id=641975
2011-03-21 18:51:14 -04:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* Mutter window icons */
/*
* Copyright (C) 2002 Havoc Pennington
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <config.h>
#include "iconcache.h"
#include "ui.h"
#include <meta/errors.h>
#include <X11/Xatom.h>
/* The icon-reading code is also in libwnck, please sync bugfixes */
static void
get_fallback_icons (MetaScreen *screen,
GdkPixbuf **iconp,
int ideal_width,
int ideal_height,
GdkPixbuf **mini_iconp,
int ideal_mini_width,
int ideal_mini_height)
{
/* we don't scale, should be fixed if we ever un-hardcode the icon
* size
*/
*iconp = meta_ui_get_default_window_icon (screen->ui);
*mini_iconp = meta_ui_get_default_mini_icon (screen->ui);
}
static gboolean
find_largest_sizes (gulong *data,
gulong nitems,
int *width,
int *height)
{
*width = 0;
*height = 0;
while (nitems > 0)
{
int w, h;
if (nitems < 3)
return FALSE; /* no space for w, h */
w = data[0];
h = data[1];
if (nitems < ((gulong)(w * h) + 2))
return FALSE; /* not enough data */
*width = MAX (w, *width);
*height = MAX (h, *height);
data += (w * h) + 2;
nitems -= (w * h) + 2;
}
return TRUE;
}
static gboolean
find_best_size (gulong *data,
gulong nitems,
int ideal_width,
int ideal_height,
int *width,
int *height,
gulong **start)
{
int best_w;
int best_h;
gulong *best_start;
int max_width, max_height;
*width = 0;
*height = 0;
*start = NULL;
if (!find_largest_sizes (data, nitems, &max_width, &max_height))
return FALSE;
if (ideal_width < 0)
ideal_width = max_width;
if (ideal_height < 0)
ideal_height = max_height;
best_w = 0;
best_h = 0;
best_start = NULL;
while (nitems > 0)
{
int w, h;
gboolean replace;
replace = FALSE;
if (nitems < 3)
return FALSE; /* no space for w, h */
w = data[0];
h = data[1];
if (nitems < ((gulong)(w * h) + 2))
break; /* not enough data */
if (best_start == NULL)
{
replace = TRUE;
}
else
{
/* work with averages */
const int ideal_size = (ideal_width + ideal_height) / 2;
int best_size = (best_w + best_h) / 2;
int this_size = (w + h) / 2;
/* larger than desired is always better than smaller */
if (best_size < ideal_size &&
this_size >= ideal_size)
replace = TRUE;
/* if we have too small, pick anything bigger */
else if (best_size < ideal_size &&
this_size > best_size)
replace = TRUE;
/* if we have too large, pick anything smaller
* but still >= the ideal
*/
else if (best_size > ideal_size &&
this_size >= ideal_size &&
this_size < best_size)
replace = TRUE;
}
if (replace)
{
best_start = data + 2;
best_w = w;
best_h = h;
}
data += (w * h) + 2;
nitems -= (w * h) + 2;
}
if (best_start)
{
*start = best_start;
*width = best_w;
*height = best_h;
return TRUE;
}
else
return FALSE;
}
static void
argbdata_to_pixdata (gulong *argb_data, int len, guchar **pixdata)
{
guchar *p;
int i;
*pixdata = g_new (guchar, len * 4);
p = *pixdata;
/* One could speed this up a lot. */
i = 0;
while (i < len)
{
guint argb;
guint rgba;
argb = argb_data[i];
rgba = (argb << 8) | (argb >> 24);
*p = rgba >> 24;
++p;
*p = (rgba >> 16) & 0xff;
++p;
*p = (rgba >> 8) & 0xff;
++p;
*p = rgba & 0xff;
++p;
++i;
}
}
static gboolean
read_rgb_icon (MetaDisplay *display,
Window xwindow,
int ideal_width,
int ideal_height,
int ideal_mini_width,
int ideal_mini_height,
int *width,
int *height,
guchar **pixdata,
int *mini_width,
int *mini_height,
guchar **mini_pixdata)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
int result, err;
guchar *data;
gulong *best;
int w, h;
gulong *best_mini;
int mini_w, mini_h;
gulong *data_as_long;
meta_error_trap_push_with_return (display);
type = None;
data = NULL;
result = XGetWindowProperty (display->xdisplay,
xwindow,
display->atom__NET_WM_ICON,
0, G_MAXLONG,
False, XA_CARDINAL, &type, &format, &nitems,
&bytes_after, &data);
err = meta_error_trap_pop_with_return (display);
if (err != Success ||
result != Success)
return FALSE;
if (type != XA_CARDINAL)
{
XFree (data);
return FALSE;
}
data_as_long = (gulong *)data;
if (!find_best_size (data_as_long, nitems,
ideal_width, ideal_height,
&w, &h, &best))
{
XFree (data);
return FALSE;
}
if (!find_best_size (data_as_long, nitems,
ideal_mini_width, ideal_mini_height,
&mini_w, &mini_h, &best_mini))
{
XFree (data);
return FALSE;
}
*width = w;
*height = h;
*mini_width = mini_w;
*mini_height = mini_h;
argbdata_to_pixdata (best, w * h, pixdata);
argbdata_to_pixdata (best_mini, mini_w * mini_h, mini_pixdata);
XFree (data);
return TRUE;
}
static void
free_pixels (guchar *pixels, gpointer data)
{
g_free (pixels);
}
static void
get_pixmap_geometry (MetaDisplay *display,
Pixmap pixmap,
int *w,
int *h,
int *d)
{
Window root_ignored;
int x_ignored, y_ignored;
guint width, height;
guint border_width_ignored;
guint depth;
if (w)
*w = 1;
if (h)
*h = 1;
if (d)
*d = 1;
XGetGeometry (display->xdisplay,
pixmap, &root_ignored, &x_ignored, &y_ignored,
&width, &height, &border_width_ignored, &depth);
if (w)
*w = width;
if (h)
*h = height;
if (d)
*d = depth;
}
static void
apply_foreground_background (GdkPixbuf *pixbuf)
{
int w, h;
int i, j;
guchar *pixels;
int stride;
w = gdk_pixbuf_get_width (pixbuf);
h = gdk_pixbuf_get_height (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
stride = gdk_pixbuf_get_rowstride (pixbuf);
i = 0;
while (i < h)
{
j = 0;
while (j < w)
{
guchar *p = pixels + i * stride + j * 4;
if (p[3] == 0)
p[0] = p[1] = p[2] = 0xff; /* white background */
else
p[0] = p[1] = p[2] = 0x00; /* black foreground */
p[3] = 0xff;
++j;
}
++i;
}
}
static GdkPixbuf*
apply_mask (GdkPixbuf *pixbuf,
GdkPixbuf *mask)
{
int w, h;
int i, j;
GdkPixbuf *with_alpha;
guchar *src;
guchar *dest;
int src_stride;
int dest_stride;
w = MIN (gdk_pixbuf_get_width (mask), gdk_pixbuf_get_width (pixbuf));
h = MIN (gdk_pixbuf_get_height (mask), gdk_pixbuf_get_height (pixbuf));
with_alpha = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0);
dest = gdk_pixbuf_get_pixels (with_alpha);
src = gdk_pixbuf_get_pixels (mask);
dest_stride = gdk_pixbuf_get_rowstride (with_alpha);
src_stride = gdk_pixbuf_get_rowstride (mask);
i = 0;
while (i < h)
{
j = 0;
while (j < w)
{
guchar *s = src + i * src_stride + j * 4;
guchar *d = dest + i * dest_stride + j * 4;
d[3] = s[3];
++j;
}
++i;
}
return with_alpha;
}
static gboolean
try_pixmap_and_mask (MetaDisplay *display,
Pixmap src_pixmap,
Pixmap src_mask,
GdkPixbuf **iconp,
int ideal_width,
int ideal_height,
GdkPixbuf **mini_iconp,
int ideal_mini_width,
int ideal_mini_height)
{
GdkPixbuf *unscaled = NULL;
GdkPixbuf *mask = NULL;
int w, h, d;
if (src_pixmap == None)
return FALSE;
meta_error_trap_push (display);
get_pixmap_geometry (display, src_pixmap, &w, &h, &d);
unscaled = meta_gdk_pixbuf_get_from_pixmap (src_pixmap,
0, 0,
w, h);
/* A depth 1 pixmap has 0 background, and 1 foreground, but
* cairo and meta_gdk_pixbuf_get_from_pixmap consider it
* to be 0 transparent, 1 opaque */
if (d == 1)
apply_foreground_background (unscaled);
if (unscaled && src_mask != None)
{
get_pixmap_geometry (display, src_mask, &w, &h, &d);
if (d == 1)
mask = meta_gdk_pixbuf_get_from_pixmap (src_mask,
0, 0,
w, h);
}
meta_error_trap_pop (display);
if (mask)
{
GdkPixbuf *masked;
masked = apply_mask (unscaled, mask);
g_object_unref (G_OBJECT (unscaled));
unscaled = masked;
g_object_unref (G_OBJECT (mask));
mask = NULL;
}
if (unscaled)
{
*iconp =
gdk_pixbuf_scale_simple (unscaled,
ideal_width > 0 ? ideal_width :
gdk_pixbuf_get_width (unscaled),
ideal_height > 0 ? ideal_height :
gdk_pixbuf_get_height (unscaled),
GDK_INTERP_BILINEAR);
*mini_iconp =
gdk_pixbuf_scale_simple (unscaled,
ideal_mini_width > 0 ? ideal_mini_width :
gdk_pixbuf_get_width (unscaled),
ideal_mini_height > 0 ? ideal_mini_height :
gdk_pixbuf_get_height (unscaled),
GDK_INTERP_BILINEAR);
g_object_unref (G_OBJECT (unscaled));
if (*iconp && *mini_iconp)
return TRUE;
else
{
if (*iconp)
g_object_unref (G_OBJECT (*iconp));
if (*mini_iconp)
g_object_unref (G_OBJECT (*mini_iconp));
return FALSE;
}
}
else
return FALSE;
}
static void
get_kwm_win_icon (MetaDisplay *display,
Window xwindow,
Pixmap *pixmap,
Pixmap *mask)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
guchar *data;
Pixmap *icons;
int err, result;
*pixmap = None;
*mask = None;
meta_error_trap_push_with_return (display);
icons = NULL;
result = XGetWindowProperty (display->xdisplay, xwindow,
display->atom__KWM_WIN_ICON,
0, G_MAXLONG,
False,
display->atom__KWM_WIN_ICON,
&type, &format, &nitems,
&bytes_after, &data);
icons = (Pixmap *)data;
err = meta_error_trap_pop_with_return (display);
if (err != Success ||
result != Success)
return;
if (type != display->atom__KWM_WIN_ICON)
{
XFree (icons);
return;
}
*pixmap = icons[0];
*mask = icons[1];
XFree (icons);
return;
}
void
meta_icon_cache_init (MetaIconCache *icon_cache)
{
g_return_if_fail (icon_cache != NULL);
icon_cache->origin = USING_NO_ICON;
icon_cache->prev_pixmap = None;
icon_cache->prev_mask = None;
#if 0
icon_cache->icon = NULL;
icon_cache->mini_icon = NULL;
icon_cache->ideal_width = -1; /* won't be a legit width */
icon_cache->ideal_height = -1;
icon_cache->ideal_mini_width = -1;
icon_cache->ideal_mini_height = -1;
#endif
icon_cache->want_fallback = TRUE;
icon_cache->wm_hints_dirty = TRUE;
icon_cache->kwm_win_icon_dirty = TRUE;
icon_cache->net_wm_icon_dirty = TRUE;
}
static void
clear_icon_cache (MetaIconCache *icon_cache,
gboolean dirty_all)
{
#if 0
if (icon_cache->icon)
g_object_unref (G_OBJECT (icon_cache->icon));
icon_cache->icon = NULL;
if (icon_cache->mini_icon)
g_object_unref (G_OBJECT (icon_cache->mini_icon));
icon_cache->mini_icon = NULL;
#endif
icon_cache->origin = USING_NO_ICON;
if (dirty_all)
{
icon_cache->wm_hints_dirty = TRUE;
icon_cache->kwm_win_icon_dirty = TRUE;
icon_cache->net_wm_icon_dirty = TRUE;
}
}
void
meta_icon_cache_free (MetaIconCache *icon_cache)
{
clear_icon_cache (icon_cache, FALSE);
}
void
meta_icon_cache_property_changed (MetaIconCache *icon_cache,
MetaDisplay *display,
Atom atom)
{
if (atom == display->atom__NET_WM_ICON)
icon_cache->net_wm_icon_dirty = TRUE;
else if (atom == display->atom__KWM_WIN_ICON)
icon_cache->kwm_win_icon_dirty = TRUE;
else if (atom == XA_WM_HINTS)
icon_cache->wm_hints_dirty = TRUE;
}
gboolean
meta_icon_cache_get_icon_invalidated (MetaIconCache *icon_cache)
{
if (icon_cache->origin <= USING_KWM_WIN_ICON &&
icon_cache->kwm_win_icon_dirty)
return TRUE;
else if (icon_cache->origin <= USING_WM_HINTS &&
icon_cache->wm_hints_dirty)
return TRUE;
else if (icon_cache->origin <= USING_NET_WM_ICON &&
icon_cache->net_wm_icon_dirty)
return TRUE;
else if (icon_cache->origin < USING_FALLBACK_ICON &&
icon_cache->want_fallback)
return TRUE;
else if (icon_cache->origin == USING_NO_ICON)
return TRUE;
else if (icon_cache->origin == USING_FALLBACK_ICON &&
!icon_cache->want_fallback)
return TRUE;
else
return FALSE;
}
static void
replace_cache (MetaIconCache *icon_cache,
IconOrigin origin,
GdkPixbuf *new_icon,
GdkPixbuf *new_mini_icon)
{
clear_icon_cache (icon_cache, FALSE);
icon_cache->origin = origin;
#if 0
if (new_icon)
g_object_ref (G_OBJECT (new_icon));
icon_cache->icon = new_icon;
if (new_mini_icon)
g_object_ref (G_OBJECT (new_mini_icon));
icon_cache->mini_icon = new_mini_icon;
#endif
}
static GdkPixbuf*
scaled_from_pixdata (guchar *pixdata,
int w,
int h,
int new_w,
int new_h)
{
GdkPixbuf *src;
GdkPixbuf *dest;
src = gdk_pixbuf_new_from_data (pixdata,
GDK_COLORSPACE_RGB,
TRUE,
8,
w, h, w * 4,
free_pixels,
NULL);
if (src == NULL)
return NULL;
if (w != h)
{
GdkPixbuf *tmp;
int size;
size = MAX (w, h);
tmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, size, size);
if (tmp)
{
gdk_pixbuf_fill (tmp, 0);
gdk_pixbuf_copy_area (src, 0, 0, w, h,
tmp,
(size - w) / 2, (size - h) / 2);
g_object_unref (src);
src = tmp;
}
}
if (w != new_w || h != new_h)
{
dest = gdk_pixbuf_scale_simple (src, new_w, new_h, GDK_INTERP_BILINEAR);
g_object_unref (G_OBJECT (src));
}
else
{
dest = src;
}
return dest;
}
gboolean
meta_read_icons (MetaScreen *screen,
Window xwindow,
MetaIconCache *icon_cache,
Pixmap wm_hints_pixmap,
Pixmap wm_hints_mask,
GdkPixbuf **iconp,
int ideal_width,
int ideal_height,
GdkPixbuf **mini_iconp,
int ideal_mini_width,
int ideal_mini_height)
{
guchar *pixdata;
int w, h;
guchar *mini_pixdata;
int mini_w, mini_h;
Pixmap pixmap;
Pixmap mask;
/* Return value is whether the icon changed */
g_return_val_if_fail (icon_cache != NULL, FALSE);
*iconp = NULL;
*mini_iconp = NULL;
#if 0
if (ideal_width != icon_cache->ideal_width ||
ideal_height != icon_cache->ideal_height ||
ideal_mini_width != icon_cache->ideal_mini_width ||
ideal_mini_height != icon_cache->ideal_mini_height)
clear_icon_cache (icon_cache, TRUE);
icon_cache->ideal_width = ideal_width;
icon_cache->ideal_height = ideal_height;
icon_cache->ideal_mini_width = ideal_mini_width;
icon_cache->ideal_mini_height = ideal_mini_height;
#endif
if (!meta_icon_cache_get_icon_invalidated (icon_cache))
return FALSE; /* we have no new info to use */
pixdata = NULL;
/* Our algorithm here assumes that we can't have for example origin
* < USING_NET_WM_ICON and icon_cache->net_wm_icon_dirty == FALSE
* unless we have tried to read NET_WM_ICON.
*
* Put another way, if an icon origin is not dirty, then we have
* tried to read it at the current size. If it is dirty, then
* we haven't done that since the last change.
*/
if (icon_cache->origin <= USING_NET_WM_ICON &&
icon_cache->net_wm_icon_dirty)
{
icon_cache->net_wm_icon_dirty = FALSE;
if (read_rgb_icon (screen->display, xwindow,
ideal_width, ideal_height,
ideal_mini_width, ideal_mini_height,
&w, &h, &pixdata,
&mini_w, &mini_h, &mini_pixdata))
{
*iconp = scaled_from_pixdata (pixdata, w, h,
ideal_width, ideal_height);
*mini_iconp = scaled_from_pixdata (mini_pixdata, mini_w, mini_h,
ideal_mini_width, ideal_mini_height);
if (*iconp && *mini_iconp)
{
replace_cache (icon_cache, USING_NET_WM_ICON,
*iconp, *mini_iconp);
return TRUE;
}
else
{
if (*iconp)
g_object_unref (G_OBJECT (*iconp));
if (*mini_iconp)
g_object_unref (G_OBJECT (*mini_iconp));
}
}
}
if (icon_cache->origin <= USING_WM_HINTS &&
icon_cache->wm_hints_dirty)
{
icon_cache->wm_hints_dirty = FALSE;
pixmap = wm_hints_pixmap;
mask = wm_hints_mask;
/* We won't update if pixmap is unchanged;
* avoids a get_from_drawable() on every geometry
* hints change
*/
if ((pixmap != icon_cache->prev_pixmap ||
mask != icon_cache->prev_mask) &&
pixmap != None)
{
if (try_pixmap_and_mask (screen->display,
pixmap, mask,
iconp, ideal_width, ideal_height,
mini_iconp, ideal_mini_width, ideal_mini_height))
{
icon_cache->prev_pixmap = pixmap;
icon_cache->prev_mask = mask;
replace_cache (icon_cache, USING_WM_HINTS,
*iconp, *mini_iconp);
return TRUE;
}
}
}
if (icon_cache->origin <= USING_KWM_WIN_ICON &&
icon_cache->kwm_win_icon_dirty)
{
icon_cache->kwm_win_icon_dirty = FALSE;
get_kwm_win_icon (screen->display, xwindow, &pixmap, &mask);
if ((pixmap != icon_cache->prev_pixmap ||
mask != icon_cache->prev_mask) &&
pixmap != None)
{
if (try_pixmap_and_mask (screen->display, pixmap, mask,
iconp, ideal_width, ideal_height,
mini_iconp, ideal_mini_width, ideal_mini_height))
{
icon_cache->prev_pixmap = pixmap;
icon_cache->prev_mask = mask;
replace_cache (icon_cache, USING_KWM_WIN_ICON,
*iconp, *mini_iconp);
return TRUE;
}
}
}
if (icon_cache->want_fallback &&
icon_cache->origin < USING_FALLBACK_ICON)
{
get_fallback_icons (screen,
iconp,
ideal_width,
ideal_height,
mini_iconp,
ideal_mini_width,
ideal_mini_height);
replace_cache (icon_cache, USING_FALLBACK_ICON,
*iconp, *mini_iconp);
return TRUE;
}
if (!icon_cache->want_fallback &&
icon_cache->origin == USING_FALLBACK_ICON)
{
/* Get rid of current icon */
clear_icon_cache (icon_cache, FALSE);
return TRUE;
}
/* found nothing new */
return FALSE;
}
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