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mutter-performance-source/src/boxes.c
Elijah Newren ec51e41c62 Patch from Carlo Wood to do some miscellaneous code cleanups found while 
2007-04-02  Elijah Newren  <newren gmail com>

	Patch from Carlo Wood to do some miscellaneous code cleanups found
	while working on #358311.

	* src/constraints.c (do_screen_and_xinerama_relative_constraints):
	nicer way of avoiding compilation warning

	* src/boxes.c (meta_rectangle_clamp_to_fit_into_region,
	  meta_rectangle_clip_to_region, meta_rectangle_shove_into_region):
	Much cleaner way of ignoring invalid boxes in comparisons

svn path=/trunk/; revision=3145
2007-04-03 18:40:00 +00:00

1893 lines
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* Simple box operations */
/*
* Copyright (C) 2005, 2006 Elijah Newren
* [meta_rectangle_intersect() is copyright the GTK+ Team according to Havoc,
* see gdkrectangle.c. As far as Havoc knows, he probably wrote
* meta_rectangle_equal(), and I'm guessing it's (C) Red Hat. So...]
* Copyright (C) 1995-2000 GTK+ Team
* Copyright (C) 2002 Red Hat, Inc.
*
* 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 "boxes.h"
#include "util.h"
#include <X11/Xutil.h> /* Just for the definition of the various gravities */
#include <stdio.h> /* For snprintf */
char*
meta_rectangle_to_string (const MetaRectangle *rect,
char *output)
{
/* 25 chars: 2 commas, space, plus, trailing \0 + 5 for each digit.
* Should be more than enough space. Note that of this space, the
* trailing \0 will be overwritten for all but the last rectangle.
*/
g_snprintf (output, RECT_LENGTH, "%d,%d +%d,%d",
rect->x, rect->y, rect->width, rect->height);
return output;
}
char*
meta_rectangle_region_to_string (GList *region,
const char *separator_string,
char *output)
{
/* 27 chars: 2 commas, 2 square brackets, space, plus, trailing \0 + 5
* for each digit. Should be more than enough space. Note that of this
* space, the trailing \0 will be overwritten for all but the last
* rectangle.
*/
char rect_string[RECT_LENGTH];
GList *tmp = region;
char *cur = output;
if (region == NULL)
snprintf (output, 10, "(EMPTY)");
while (tmp)
{
MetaRectangle *rect = tmp->data;
g_snprintf (rect_string, RECT_LENGTH, "[%d,%d +%d,%d]",
rect->x, rect->y, rect->width, rect->height);
cur = g_stpcpy (cur, rect_string);
tmp = tmp->next;
if (tmp)
cur = g_stpcpy (cur, separator_string);
}
return output;
}
char*
meta_rectangle_edge_to_string (const MetaEdge *edge,
char *output)
{
/* 25 chars: 2 commas, space, plus, trailing \0 + 5 for each digit.
* Should be more than enough space. Note that of this space, the
* trailing \0 will be overwritten for all but the last rectangle.
*
* Plus 2 for parenthesis, 4 for 2 more numbers, 2 more commas, and
* 2 more spaces, for a total of 10 more.
*/
g_snprintf (output, EDGE_LENGTH, "[%d,%d +%d,%d], %2d, %2d",
edge->rect.x, edge->rect.y, edge->rect.width, edge->rect.height,
edge->side_type, edge->edge_type);
return output;
}
char*
meta_rectangle_edge_list_to_string (GList *edge_list,
const char *separator_string,
char *output)
{
/* 27 chars: 2 commas, 2 square brackets, space, plus, trailing \0 + 5 for
* each digit. Should be more than enough space. Note that of this
* space, the trailing \0 will be overwritten for all but the last
* rectangle.
*
* Plus 2 for parenthesis, 4 for 2 more numbers, 2 more commas, and
* 2 more spaces, for a total of 10 more.
*/
char rect_string[EDGE_LENGTH];
char *cur = output;
GList *tmp = edge_list;
if (edge_list == NULL)
snprintf (output, 10, "(EMPTY)");
while (tmp)
{
MetaEdge *edge = tmp->data;
MetaRectangle *rect = &edge->rect;
g_snprintf (rect_string, EDGE_LENGTH, "([%d,%d +%d,%d], %2d, %2d)",
rect->x, rect->y, rect->width, rect->height,
edge->side_type, edge->edge_type);
cur = g_stpcpy (cur, rect_string);
tmp = tmp->next;
if (tmp)
cur = g_stpcpy (cur, separator_string);
}
return output;
}
MetaRectangle
meta_rect (int x, int y, int width, int height)
{
MetaRectangle temporary;
temporary.x = x;
temporary.y = y;
temporary.width = width;
temporary.height = height;
return temporary;
}
int
meta_rectangle_area (const MetaRectangle *rect)
{
g_return_val_if_fail (rect != NULL, 0);
return rect->width * rect->height;
}
gboolean
meta_rectangle_intersect (const MetaRectangle *src1,
const MetaRectangle *src2,
MetaRectangle *dest)
{
int dest_x, dest_y;
int dest_w, dest_h;
int return_val;
g_return_val_if_fail (src1 != NULL, FALSE);
g_return_val_if_fail (src2 != NULL, FALSE);
g_return_val_if_fail (dest != NULL, FALSE);
return_val = FALSE;
dest_x = MAX (src1->x, src2->x);
dest_y = MAX (src1->y, src2->y);
dest_w = MIN (src1->x + src1->width, src2->x + src2->width) - dest_x;
dest_h = MIN (src1->y + src1->height, src2->y + src2->height) - dest_y;
if (dest_w > 0 && dest_h > 0)
{
dest->x = dest_x;
dest->y = dest_y;
dest->width = dest_w;
dest->height = dest_h;
return_val = TRUE;
}
else
{
dest->width = 0;
dest->height = 0;
}
return return_val;
}
gboolean
meta_rectangle_equal (const MetaRectangle *src1,
const MetaRectangle *src2)
{
return ((src1->x == src2->x) &&
(src1->y == src2->y) &&
(src1->width == src2->width) &&
(src1->height == src2->height));
}
gboolean
meta_rectangle_overlap (const MetaRectangle *rect1,
const MetaRectangle *rect2)
{
g_return_val_if_fail (rect1 != NULL, FALSE);
g_return_val_if_fail (rect2 != NULL, FALSE);
return !((rect1->x + rect1->width <= rect2->x) ||
(rect2->x + rect2->width <= rect1->x) ||
(rect1->y + rect1->height <= rect2->y) ||
(rect2->y + rect2->height <= rect1->y));
}
gboolean
meta_rectangle_vert_overlap (const MetaRectangle *rect1,
const MetaRectangle *rect2)
{
return (rect1->y < rect2->y + rect2->height &&
rect2->y < rect1->y + rect1->height);
}
gboolean
meta_rectangle_horiz_overlap (const MetaRectangle *rect1,
const MetaRectangle *rect2)
{
return (rect1->x < rect2->x + rect2->width &&
rect2->x < rect1->x + rect1->width);
}
gboolean
meta_rectangle_could_fit_rect (const MetaRectangle *outer_rect,
const MetaRectangle *inner_rect)
{
return (outer_rect->width >= inner_rect->width &&
outer_rect->height >= inner_rect->height);
}
gboolean
meta_rectangle_contains_rect (const MetaRectangle *outer_rect,
const MetaRectangle *inner_rect)
{
return
inner_rect->x >= outer_rect->x &&
inner_rect->y >= outer_rect->y &&
inner_rect->x + inner_rect->width <= outer_rect->x + outer_rect->width &&
inner_rect->y + inner_rect->height <= outer_rect->y + outer_rect->height;
}
void
meta_rectangle_resize_with_gravity (const MetaRectangle *old_rect,
MetaRectangle *rect,
int gravity,
int new_width,
int new_height)
{
/* FIXME: I'm too deep into this to know whether the below comment is
* still clear or not now that I've moved it out of constraints.c.
* boxes.h has a good comment, but I'm not sure if the below info is also
* helpful on top of that (or whether it has superfluous info).
*/
/* These formulas may look overly simplistic at first but you can work
* everything out with a left_frame_with, right_frame_width,
* border_width, and old and new client area widths (instead of old total
* width and new total width) and you come up with the same formulas.
*
* Also, note that the reason we can treat NorthWestGravity and
* StaticGravity the same is because we're not given a location at
* which to place the window--the window was already placed
* appropriately before. So, NorthWestGravity for this function
* means to just leave the upper left corner of the outer window
* where it already is, and StaticGravity for this function means to
* just leave the upper left corner of the inner window where it
* already is. But leaving either of those two corners where they
* already are will ensure that the other corner is fixed as well
* (since frame size doesn't change)--thus making the two
* equivalent.
*/
/* First, the x direction */
int adjust = 0;
switch (gravity)
{
case NorthWestGravity:
case WestGravity:
case SouthWestGravity:
rect->x = old_rect->x;
break;
case NorthGravity:
case CenterGravity:
case SouthGravity:
/* FIXME: Needing to adjust new_width kind of sucks, but not doing so
* would cause drift.
*/
new_width -= (old_rect->width - new_width) % 2;
rect->x = old_rect->x + (old_rect->width - new_width)/2;
break;
case NorthEastGravity:
case EastGravity:
case SouthEastGravity:
rect->x = old_rect->x + (old_rect->width - new_width);
break;
case StaticGravity:
default:
rect->x = old_rect->x;
break;
}
rect->width = new_width;
/* Next, the y direction */
adjust = 0;
switch (gravity)
{
case NorthWestGravity:
case NorthGravity:
case NorthEastGravity:
rect->y = old_rect->y;
break;
case WestGravity:
case CenterGravity:
case EastGravity:
/* FIXME: Needing to adjust new_height kind of sucks, but not doing so
* would cause drift.
*/
new_height -= (old_rect->height - new_height) % 2;
rect->y = old_rect->y + (old_rect->height - new_height)/2;
break;
case SouthWestGravity:
case SouthGravity:
case SouthEastGravity:
rect->y = old_rect->y + (old_rect->height - new_height);
break;
case StaticGravity:
default:
rect->y = old_rect->y;
break;
}
rect->height = new_height;
}
/* Not so simple helper function for get_minimal_spanning_set_for_region() */
static GList*
merge_spanning_rects_in_region (GList *region)
{
/* NOTE FOR ANY OPTIMIZATION PEOPLE OUT THERE: Please see the
* documentation of get_minimal_spanning_set_for_region() for performance
* considerations that also apply to this function.
*/
GList* compare;
compare = region;
if (region == NULL)
{
meta_warning ("Region to merge was empty! Either you have a some "
"pathological STRUT list or there's a bug somewhere!\n");
return NULL;
}
while (compare && compare->next)
{
MetaRectangle *a = compare->data;
GList *other = compare->next;
g_assert (a->width > 0 && a->height > 0);
while (other)
{
MetaRectangle *b = other->data;
GList *delete_me = NULL;
g_assert (b->width > 0 && b->height > 0);
/* If a contains b, just remove b */
if (meta_rectangle_contains_rect (a, b))
{
delete_me = other;
}
/* If b contains a, just remove a */
else if (meta_rectangle_contains_rect (a, b))
{
delete_me = compare;
}
/* If a and b might be mergeable horizontally */
else if (a->y == b->y && a->height == b->height)
{
/* If a and b overlap */
if (meta_rectangle_overlap (a, b))
{
int new_x = MIN (a->x, b->x);
a->width = MAX (a->x + a->width, b->x + b->width) - new_x;
a->x = new_x;
delete_me = other;
}
/* If a and b are adjacent */
else if (a->x + a->width == b->x || a->x == b->x + b->width)
{
int new_x = MIN (a->x, b->x);
a->width = MAX (a->x + a->width, b->x + b->width) - new_x;
a->x = new_x;
delete_me = other;
}
}
/* If a and b might be mergeable vertically */
else if (a->x == b->x && a->width == b->width)
{
/* If a and b overlap */
if (meta_rectangle_overlap (a, b))
{
int new_y = MIN (a->y, b->y);
a->height = MAX (a->y + a->height, b->y + b->height) - new_y;
a->y = new_y;
delete_me = other;
}
/* If a and b are adjacent */
else if (a->y + a->height == b->y || a->y == b->y + b->height)
{
int new_y = MIN (a->y, b->y);
a->height = MAX (a->y + a->height, b->y + b->height) - new_y;
a->y = new_y;
delete_me = other;
}
}
other = other->next;
/* Delete any rectangle in the list that is no longer wanted */
if (delete_me != NULL)
{
/* Deleting the rect we compare others to is a little tricker */
if (compare == delete_me)
{
compare = compare->next;
other = compare->next;
a = compare->data;
}
/* Okay, we can free it now */
g_free (delete_me->data);
region = g_list_delete_link (region, delete_me);
}
}
compare = compare->next;
}
return region;
}
/* Simple helper function for get_minimal_spanning_set_for_region()... */
static gint
compare_rect_areas (gconstpointer a, gconstpointer b)
{
const MetaRectangle *a_rect = (gconstpointer) a;
const MetaRectangle *b_rect = (gconstpointer) b;
int a_area = meta_rectangle_area (a_rect);
int b_area = meta_rectangle_area (b_rect);
return b_area - a_area; /* positive ret value denotes b > a, ... */
}
/* This function is trying to find a "minimal spanning set (of rectangles)"
* for a given region.
*
* The region is given by taking basic_rect, then removing the areas
* covered by all the rectangles in the all_struts list, and then expanding
* the resulting region by the given number of pixels in each direction.
*
* A "minimal spanning set (of rectangles)" is the best name I could come
* up with for the concept I had in mind. Basically, for a given region, I
* want a set of rectangles with the property that a window is contained in
* the region if and only if it is contained within at least one of the
* rectangles.
*
* The GList* returned will be a list of (allocated) MetaRectangles.
* The list will need to be freed by calling
* meta_rectangle_free_spanning_set() on it (or by manually
* implementing that function...)
*/
GList*
meta_rectangle_get_minimal_spanning_set_for_region (
const MetaRectangle *basic_rect,
const GSList *all_struts)
{
/* NOTE FOR OPTIMIZERS: This function *might* be somewhat slow,
* especially due to the call to merge_spanning_rects_in_region() (which
* is O(n^2) where n is the size of the list generated in this function).
* This is made more onerous due to the fact that it involves a fair
* number of memory allocation and deallocation calls. However, n is 1
* for default installations of Gnome (because partial struts aren't used
* by default and only partial struts increase the size of the spanning
* set generated). With one partial strut, n will be 2 or 3. With 2
* partial struts, n will probably be 4 or 5. So, n probably isn't large
* enough to make this worth bothering. Further, it is only called from
* workspace.c:ensure_work_areas_validated (at least as of the time of
* writing this comment), which in turn should only be called if the
* strut list changes or the screen or xinerama size changes. If it ever
* does show up on profiles (most likely because people start using
* ridiculously huge numbers of partial struts), possible optimizations
* include:
*
* (1) rewrite merge_spanning_rects_in_region() to be O(n) or O(nlogn).
* I'm not totally sure it's possible, but with a couple copies of
* the list and sorting them appropriately, I believe it might be.
* (2) only call merge_spanning_rects_in_region() with a subset of the
* full list of rectangles. I believe from some of my preliminary
* debugging and thinking about it that it is possible to figure out
* apriori groups of rectangles which are only merge candidates with
* each other. (See testboxes.c:get_screen_region() when which==2
* and track the steps of this function carefully to see what gave
* me the hint that this might work)
* (3) figure out how to avoid merge_spanning_rects_in_region(). I think
* it might be possible to modify this function to make that
* possible, and I spent just a little while thinking about it, but n
* wasn't large enough to convince me to care yet.
* (4) Some of the stuff Rob mentioned at http://mail.gnome.org/archives\
* /metacity-devel-list/2005-November/msg00028.html. (Sorry for the
* URL splitting.)
*/
GList *ret;
GList *tmp_list;
const GSList *strut_iter;
MetaRectangle *temp_rect;
/* The algorithm is basically as follows:
* Initialize rectangle_set to basic_rect
* Foreach strut:
* Foreach rectangle in rectangle_set:
* - Split the rectangle into new rectangles that don't overlap the
* strut (but which are as big as possible otherwise)
* - Remove the old (pre-split) rectangle from the rectangle_set,
* and replace it with the new rectangles generated from the
* splitting
*/
temp_rect = g_new (MetaRectangle, 1);
*temp_rect = *basic_rect;
ret = g_list_prepend (NULL, temp_rect);
strut_iter = all_struts;
for (strut_iter = all_struts; strut_iter; strut_iter = strut_iter->next)
{
GList *rect_iter;
MetaRectangle *strut_rect = &((MetaStrut*)strut_iter->data)->rect;
tmp_list = ret;
ret = NULL;
rect_iter = tmp_list;
while (rect_iter)
{
MetaRectangle *rect = (MetaRectangle*) rect_iter->data;
if (!meta_rectangle_overlap (rect, strut_rect))
ret = g_list_prepend (ret, rect);
else
{
/* If there is area in rect left of strut */
if (BOX_LEFT (*rect) < BOX_LEFT (*strut_rect))
{
temp_rect = g_new (MetaRectangle, 1);
*temp_rect = *rect;
temp_rect->width = BOX_LEFT (*strut_rect) - BOX_LEFT (*rect);
ret = g_list_prepend (ret, temp_rect);
}
/* If there is area in rect right of strut */
if (BOX_RIGHT (*rect) > BOX_RIGHT (*strut_rect))
{
int new_x;
temp_rect = g_new (MetaRectangle, 1);
*temp_rect = *rect;
new_x = BOX_RIGHT (*strut_rect);
temp_rect->width = BOX_RIGHT(*rect) - new_x;
temp_rect->x = new_x;
ret = g_list_prepend (ret, temp_rect);
}
/* If there is area in rect above strut */
if (BOX_TOP (*rect) < BOX_TOP (*strut_rect))
{
temp_rect = g_new (MetaRectangle, 1);
*temp_rect = *rect;
temp_rect->height = BOX_TOP (*strut_rect) - BOX_TOP (*rect);
ret = g_list_prepend (ret, temp_rect);
}
/* If there is area in rect below strut */
if (BOX_BOTTOM (*rect) > BOX_BOTTOM (*strut_rect))
{
int new_y;
temp_rect = g_new (MetaRectangle, 1);
*temp_rect = *rect;
new_y = BOX_BOTTOM (*strut_rect);
temp_rect->height = BOX_BOTTOM (*rect) - new_y;
temp_rect->y = new_y;
ret = g_list_prepend (ret, temp_rect);
}
g_free (rect);
}
rect_iter = rect_iter->next;
}
g_list_free (tmp_list);
}
/* Sort by maximal area, just because I feel like it... */
ret = g_list_sort (ret, compare_rect_areas);
/* Merge rectangles if possible so that the list really is minimal */
ret = merge_spanning_rects_in_region (ret);
return ret;
}
GList*
meta_rectangle_expand_region (GList *region,
const int left_expand,
const int right_expand,
const int top_expand,
const int bottom_expand)
{
return meta_rectangle_expand_region_conditionally (region,
left_expand,
right_expand,
top_expand,
bottom_expand,
0,
0);
}
GList*
meta_rectangle_expand_region_conditionally (GList *region,
const int left_expand,
const int right_expand,
const int top_expand,
const int bottom_expand,
const int min_x,
const int min_y)
{
GList *tmp_list = region;
while (tmp_list)
{
MetaRectangle *rect = (MetaRectangle*) tmp_list->data;
if (rect->width >= min_x)
{
rect->x -= left_expand;
rect->width += (left_expand + right_expand);
}
if (rect->height >= min_y)
{
rect->y -= top_expand;
rect->height += (top_expand + bottom_expand);
}
tmp_list = tmp_list->next;
}
return region;
}
void
meta_rectangle_expand_to_avoiding_struts (MetaRectangle *rect,
const MetaRectangle *expand_to,
const MetaDirection direction,
const GSList *all_struts)
{
const GSList *strut_iter;
/* If someone wants this function to handle more fine-grained
* direction expanding in the future (e.g. only left, or fully
* horizontal plus upward), feel free. But I'm hard-coding for both
* horizontal directions (exclusive-)or both vertical directions.
*/
g_assert ((direction == META_DIRECTION_HORIZONTAL) ^
(direction == META_DIRECTION_VERTICAL ));
if (direction == META_DIRECTION_HORIZONTAL)
{
rect->x = expand_to->x;
rect->width = expand_to->width;
}
else
{
rect->y = expand_to->y;
rect->height = expand_to->height;
}
/* Run over all struts */
for (strut_iter = all_struts; strut_iter; strut_iter = strut_iter->next)
{
MetaStrut *strut = (MetaStrut*) strut_iter->data;
/* Skip struts that don't overlap */
if (!meta_rectangle_overlap (&strut->rect, rect))
continue;
if (direction == META_DIRECTION_HORIZONTAL)
{
if (strut->side == META_SIDE_LEFT)
{
int offset = BOX_RIGHT(strut->rect) - BOX_LEFT(*rect);
rect->x += offset;
rect->width -= offset;
}
else if (strut->side == META_SIDE_RIGHT)
{
int offset = BOX_RIGHT (*rect) - BOX_LEFT(strut->rect);
rect->width -= offset;
}
/* else ignore the strut */
}
else /* direction == META_DIRECTION_VERTICAL */
{
if (strut->side == META_SIDE_TOP)
{
int offset = BOX_BOTTOM(strut->rect) - BOX_TOP(*rect);
rect->y += offset;
rect->height -= offset;
}
else if (strut->side == META_SIDE_BOTTOM)
{
int offset = BOX_BOTTOM(*rect) - BOX_TOP(strut->rect);
rect->height -= offset;
}
/* else ignore the strut */
}
} /* end loop over struts */
} /* end meta_rectangle_expand_to_avoiding_struts */
void
meta_rectangle_free_list_and_elements (GList *filled_list)
{
g_list_foreach (filled_list,
(void (*)(gpointer,gpointer))&g_free, /* ew, for ugly */
NULL);
g_list_free (filled_list);
}
gboolean
meta_rectangle_could_fit_in_region (const GList *spanning_rects,
const MetaRectangle *rect)
{
const GList *temp;
gboolean could_fit;
temp = spanning_rects;
could_fit = FALSE;
while (!could_fit && temp != NULL)
{
could_fit = could_fit || meta_rectangle_could_fit_rect (temp->data, rect);
temp = temp->next;
}
return could_fit;
}
gboolean
meta_rectangle_contained_in_region (const GList *spanning_rects,
const MetaRectangle *rect)
{
const GList *temp;
gboolean contained;
temp = spanning_rects;
contained = FALSE;
while (!contained && temp != NULL)
{
contained = contained || meta_rectangle_contains_rect (temp->data, rect);
temp = temp->next;
}
return contained;
}
gboolean
meta_rectangle_overlaps_with_region (const GList *spanning_rects,
const MetaRectangle *rect)
{
const GList *temp;
gboolean overlaps;
temp = spanning_rects;
overlaps = FALSE;
while (!overlaps && temp != NULL)
{
overlaps = overlaps || meta_rectangle_overlap (temp->data, rect);
temp = temp->next;
}
return overlaps;
}
void
meta_rectangle_clamp_to_fit_into_region (const GList *spanning_rects,
FixedDirections fixed_directions,
MetaRectangle *rect,
const MetaRectangle *min_size)
{
const GList *temp;
const MetaRectangle *best_rect = NULL;
int best_overlap = 0;
/* First, find best rectangle from spanning_rects to which we can clamp
* rect to fit into.
*/
for (temp = spanning_rects; temp; temp = temp->next)
{
MetaRectangle *compare_rect = temp->data;
int maximal_overlap_amount_for_compare;
/* If x is fixed and the entire width of rect doesn't fit in compare,
* skip this rectangle.
*/
if ((fixed_directions & FIXED_DIRECTION_X) &&
(compare_rect->x > rect->x ||
compare_rect->x + compare_rect->width < rect->x + rect->width))
continue;
/* If y is fixed and the entire height of rect doesn't fit in compare,
* skip this rectangle.
*/
if ((fixed_directions & FIXED_DIRECTION_Y) &&
(compare_rect->y > rect->y ||
compare_rect->y + compare_rect->height < rect->y + rect->height))
continue;
/* If compare can't hold the min_size window, skip this rectangle. */
if (compare_rect->width < min_size->width ||
compare_rect->height < min_size->height)
continue;
/* Determine maximal overlap amount */
maximal_overlap_amount_for_compare =
MIN (rect->width, compare_rect->width) *
MIN (rect->height, compare_rect->height);
/* See if this is the best rect so far */
if (maximal_overlap_amount_for_compare > best_overlap)
{
best_rect = compare_rect;
best_overlap = maximal_overlap_amount_for_compare;
}
}
/* Clamp rect appropriately */
if (best_rect == NULL)
{
meta_warning ("No rect whose size to clamp to found!\n");
/* If it doesn't fit, at least make it no bigger than it has to be */
if (!(fixed_directions & FIXED_DIRECTION_X))
rect->width = min_size->width;
if (!(fixed_directions & FIXED_DIRECTION_Y))
rect->height = min_size->height;
}
else
{
rect->width = MIN (rect->width, best_rect->width);
rect->height = MIN (rect->height, best_rect->height);
}
}
void
meta_rectangle_clip_to_region (const GList *spanning_rects,
FixedDirections fixed_directions,
MetaRectangle *rect)
{
const GList *temp;
const MetaRectangle *best_rect = NULL;
int best_overlap = 0;
/* First, find best rectangle from spanning_rects to which we will clip
* rect into.
*/
for (temp = spanning_rects; temp; temp = temp->next)
{
MetaRectangle *compare_rect = temp->data;
MetaRectangle overlap;
int maximal_overlap_amount_for_compare;
/* If x is fixed and the entire width of rect doesn't fit in compare,
* skip the rectangle.
*/
if ((fixed_directions & FIXED_DIRECTION_X) &&
(compare_rect->x > rect->x ||
compare_rect->x + compare_rect->width < rect->x + rect->width))
continue;
/* If y is fixed and the entire height of rect doesn't fit in compare,
* skip the rectangle.
*/
if ((fixed_directions & FIXED_DIRECTION_Y) &&
(compare_rect->y > rect->y ||
compare_rect->y + compare_rect->height < rect->y + rect->height))
continue;
/* Determine maximal overlap amount */
meta_rectangle_intersect (rect, compare_rect, &overlap);
maximal_overlap_amount_for_compare = meta_rectangle_area (&overlap);
/* See if this is the best rect so far */
if (maximal_overlap_amount_for_compare > best_overlap)
{
best_rect = compare_rect;
best_overlap = maximal_overlap_amount_for_compare;
}
}
/* Clip rect appropriately */
if (best_rect == NULL)
meta_warning ("No rect to clip to found!\n");
else
{
/* Extra precaution with checking fixed direction shouldn't be needed
* due to logic above, but it shouldn't hurt either.
*/
if (!(fixed_directions & FIXED_DIRECTION_X))
{
/* Find the new left and right */
int new_x = MAX (rect->x, best_rect->x);
rect->width = MIN ((rect->x + rect->width) - new_x,
(best_rect->x + best_rect->width) - new_x);
rect->x = new_x;
}
/* Extra precaution with checking fixed direction shouldn't be needed
* due to logic above, but it shouldn't hurt either.
*/
if (!(fixed_directions & FIXED_DIRECTION_Y))
{
/* Clip the top, if needed */
int new_y = MAX (rect->y, best_rect->y);
rect->height = MIN ((rect->y + rect->height) - new_y,
(best_rect->y + best_rect->height) - new_y);
rect->y = new_y;
}
}
}
void
meta_rectangle_shove_into_region (const GList *spanning_rects,
FixedDirections fixed_directions,
MetaRectangle *rect)
{
const GList *temp;
const MetaRectangle *best_rect = NULL;
int best_overlap = 0;
int shortest_distance = G_MAXINT;
/* First, find best rectangle from spanning_rects to which we will shove
* rect into.
*/
for (temp = spanning_rects; temp; temp = temp->next)
{
MetaRectangle *compare_rect = temp->data;
int maximal_overlap_amount_for_compare;
int dist_to_compare;
/* If x is fixed and the entire width of rect doesn't fit in compare,
* skip this rectangle.
*/
if ((fixed_directions & FIXED_DIRECTION_X) &&
(compare_rect->x > rect->x ||
compare_rect->x + compare_rect->width < rect->x + rect->width))
continue;
/* If y is fixed and the entire height of rect doesn't fit in compare,
* skip this rectangle.
*/
if ((fixed_directions & FIXED_DIRECTION_Y) &&
(compare_rect->y > rect->y ||
compare_rect->y + compare_rect->height < rect->y + rect->height))
continue;
/* Determine maximal overlap amount between rect & compare_rect */
maximal_overlap_amount_for_compare =
MIN (rect->width, compare_rect->width) *
MIN (rect->height, compare_rect->height);
/* Determine distance necessary to put rect into compare_rect */
dist_to_compare = 0;
if (compare_rect->x > rect->x)
dist_to_compare += compare_rect->x - rect->x;
if (compare_rect->x + compare_rect->width < rect->x + rect->width)
dist_to_compare += (rect->x + rect->width) -
(compare_rect->x + compare_rect->width);
if (compare_rect->y > rect->y)
dist_to_compare += compare_rect->y - rect->y;
if (compare_rect->y + compare_rect->height < rect->y + rect->height)
dist_to_compare += (rect->y + rect->height) -
(compare_rect->y + compare_rect->height);
/* See if this is the best rect so far */
if ((maximal_overlap_amount_for_compare > best_overlap) ||
(maximal_overlap_amount_for_compare == best_overlap &&
dist_to_compare < shortest_distance))
{
best_rect = compare_rect;
best_overlap = maximal_overlap_amount_for_compare;
shortest_distance = dist_to_compare;
}
}
/* Shove rect appropriately */
if (best_rect == NULL)
meta_warning ("No rect to shove into found!\n");
else
{
/* Extra precaution with checking fixed direction shouldn't be needed
* due to logic above, but it shouldn't hurt either.
*/
if (!(fixed_directions & FIXED_DIRECTION_X))
{
/* Shove to the right, if needed */
if (best_rect->x > rect->x)
rect->x = best_rect->x;
/* Shove to the left, if needed */
if (best_rect->x + best_rect->width < rect->x + rect->width)
rect->x = (best_rect->x + best_rect->width) - rect->width;
}
/* Extra precaution with checking fixed direction shouldn't be needed
* due to logic above, but it shouldn't hurt either.
*/
if (!(fixed_directions & FIXED_DIRECTION_Y))
{
/* Shove down, if needed */
if (best_rect->y > rect->y)
rect->y = best_rect->y;
/* Shove up, if needed */
if (best_rect->y + best_rect->height < rect->y + rect->height)
rect->y = (best_rect->y + best_rect->height) - rect->height;
}
}
}
void
meta_rectangle_find_linepoint_closest_to_point (double x1,
double y1,
double x2,
double y2,
double px,
double py,
double *valx,
double *valy)
{
/* I'll use the shorthand rx, ry for the return values, valx & valy.
* Now, we need (rx,ry) to be on the line between (x1,y1) and (x2,y2).
* For that to happen, we first need the slope of the line from (x1,y1)
* to (rx,ry) must match the slope of (x1,y1) to (x2,y2), i.e.:
* (ry-y1) (y2-y1)
* ------- = -------
* (rx-x1) (x2-x1)
* If x1==x2, though, this gives divide by zero errors, so we want to
* rewrite the equation by multiplying both sides by (rx-x1)*(x2-x1):
* (ry-y1)(x2-x1) = (y2-y1)(rx-x1)
* This is a valid requirement even when x1==x2 (when x1==x2, this latter
* equation will basically just mean that rx must be equal to both x1 and
* x2)
*
* The other requirement that we have is that the line from (rx,ry) to
* (px,py) must be perpendicular to the line from (x1,y1) to (x2,y2). So
* we just need to get a vector in the direction of each line, take the
* dot product of the two, and ensure that the result is 0:
* (rx-px)*(x2-x1) + (ry-py)*(y2-y1) = 0.
*
* This gives us two equations and two unknowns:
*
* (ry-y1)(x2-x1) = (y2-y1)(rx-x1)
* (rx-px)*(x2-x1) + (ry-py)*(y2-y1) = 0.
*
* This particular pair of equations is always solvable so long as
* (x1,y1) and (x2,y2) are not the same point (and note that anyone who
* calls this function that way is braindead because it means that they
* really didn't specify a line after all). However, the caller should
* be careful to avoid making (x1,y1) and (x2,y2) too close (e.g. like
* 10^{-8} apart in each coordinate), otherwise roundoff error could
* cause issues. Solving these equations by hand (or using Maple(TM) or
* Mathematica(TM) or whatever) results in slightly messy expressions,
* but that's all the below few lines do.
*/
double diffx, diffy, den;
diffx = x2 - x1;
diffy = y2 - y1;
den = diffx * diffx + diffy * diffy;
*valx = (py * diffx * diffy + px * diffx * diffx +
y2 * x1 * diffy - y1 * x2 * diffy) / den;
*valy = (px * diffx * diffy + py * diffy * diffy +
x2 * y1 * diffx - x1 * y2 * diffx) / den;
}
/***************************************************************************/
/* */
/* Switching gears to code for edges instead of just rectangles */
/* */
/***************************************************************************/
gboolean
meta_rectangle_edge_aligns (const MetaRectangle *rect, const MetaEdge *edge)
{
/* The reason for the usage of <= below instead of < is because we are
* interested in in-the-way-or-adject'ness. So, a left (i.e. vertical
* edge) occupying y positions 0-9 (which has a y of 0 and a height of
* 10) and a rectangle with top at y=10 would be considered to "align" by
* this function.
*/
switch (edge->side_type)
{
case META_DIRECTION_LEFT:
case META_DIRECTION_RIGHT:
return BOX_TOP (*rect) <= BOX_BOTTOM (edge->rect) &&
BOX_TOP (edge->rect) <= BOX_BOTTOM (*rect);
case META_DIRECTION_TOP:
case META_DIRECTION_BOTTOM:
return BOX_LEFT (*rect) <= BOX_RIGHT (edge->rect) &&
BOX_LEFT (edge->rect) <= BOX_RIGHT (*rect);
default:
g_assert_not_reached ();
}
}
static GList*
get_rect_minus_overlap (const GList *rect_in_list,
MetaRectangle *overlap)
{
MetaRectangle *temp;
MetaRectangle *rect = rect_in_list->data;
GList *ret = NULL;
if (BOX_LEFT (*rect) < BOX_LEFT (*overlap))
{
temp = g_new (MetaRectangle, 1);
*temp = *rect;
temp->width = BOX_LEFT (*overlap) - BOX_LEFT (*rect);
ret = g_list_prepend (ret, temp);
}
if (BOX_RIGHT (*rect) > BOX_RIGHT (*overlap))
{
temp = g_new (MetaRectangle, 1);
*temp = *rect;
temp->x = BOX_RIGHT (*overlap);
temp->width = BOX_RIGHT (*rect) - BOX_RIGHT (*overlap);
ret = g_list_prepend (ret, temp);
}
if (BOX_TOP (*rect) < BOX_TOP (*overlap))
{
temp = g_new (MetaRectangle, 1);
temp->x = overlap->x;
temp->width = overlap->width;
temp->y = BOX_TOP (*rect);
temp->height = BOX_TOP (*overlap) - BOX_TOP (*rect);
ret = g_list_prepend (ret, temp);
}
if (BOX_BOTTOM (*rect) > BOX_BOTTOM (*overlap))
{
temp = g_new (MetaRectangle, 1);
temp->x = overlap->x;
temp->width = overlap->width;
temp->y = BOX_BOTTOM (*overlap);
temp->height = BOX_BOTTOM (*rect) - BOX_BOTTOM (*overlap);
ret = g_list_prepend (ret, temp);
}
return ret;
}
static GList*
replace_rect_with_list (GList *old_element,
GList *new_list)
{
GList *ret;
g_assert (old_element != NULL);
if (!new_list)
{
/* If there is no new list, just remove the old_element */
ret = g_list_remove_link (old_element, old_element);
}
else
{
/* Fix up the prev and next pointers everywhere */
ret = new_list;
if (old_element->prev)
{
old_element->prev->next = new_list;
new_list->prev = old_element->prev;
}
if (old_element->next)
{
GList *tmp = g_list_last (new_list);
old_element->next->prev = tmp;
tmp->next = old_element->next;
}
}
/* Free the old_element and return the appropriate "next" point */
g_free (old_element->data);
g_list_free_1 (old_element);
return ret;
}
/* Make a copy of the strut list, make sure that copy only contains parts
* of the old_struts that intersect with the region rect, and then do some
* magic to make all the new struts disjoint (okay, we we break up struts
* that aren't disjoint in a way that the overlapping part is only included
* once, so it's not really magic...).
*/
static GList*
get_disjoint_strut_rect_list_in_region (const GSList *old_struts,
const MetaRectangle *region)
{
GList *strut_rects;
GList *tmp;
/* First, copy the list */
strut_rects = NULL;
while (old_struts)
{
MetaRectangle *cur = &((MetaStrut*)old_struts->data)->rect;
MetaRectangle *copy = g_new (MetaRectangle, 1);
*copy = *cur;
if (meta_rectangle_intersect (copy, region, copy))
strut_rects = g_list_prepend (strut_rects, copy);
else
g_free (copy);
old_struts = old_struts->next;
}
/* Now, loop over the list and check for intersections, fixing things up
* where they do intersect.
*/
tmp = strut_rects;
while (tmp)
{
GList *compare;
MetaRectangle *cur = tmp->data;
compare = tmp->next;
while (compare)
{
MetaRectangle *comp = compare->data;
MetaRectangle overlap;
if (meta_rectangle_intersect (cur, comp, &overlap))
{
/* Get a list of rectangles for each strut that don't overlap
* the intersection region.
*/
GList *cur_leftover = get_rect_minus_overlap (tmp, &overlap);
GList *comp_leftover = get_rect_minus_overlap (compare, &overlap);
/* Add the intersection region to cur_leftover */
MetaRectangle *overlap_allocated = g_new (MetaRectangle, 1);
*overlap_allocated = overlap;
cur_leftover = g_list_prepend (cur_leftover, overlap_allocated);
/* Fix up tmp, compare, and cur -- maybe struts too */
if (strut_rects == tmp)
{
strut_rects = replace_rect_with_list (tmp, cur_leftover);
tmp = strut_rects;
}
else
tmp = replace_rect_with_list (tmp, cur_leftover);
compare = replace_rect_with_list (compare, comp_leftover);
if (compare == NULL)
break;
cur = tmp->data;
}
compare = compare->next;
}
tmp = tmp->next;
}
return strut_rects;
}
gint
meta_rectangle_edge_cmp_ignore_type (gconstpointer a, gconstpointer b)
{
const MetaEdge *a_edge_rect = (gconstpointer) a;
const MetaEdge *b_edge_rect = (gconstpointer) b;
int a_compare, b_compare;
/* Edges must be both vertical or both horizontal, or it doesn't make
* sense to compare them.
*/
g_assert ((a_edge_rect->rect.width == 0 && b_edge_rect->rect.width == 0) ||
(a_edge_rect->rect.height == 0 && b_edge_rect->rect.height == 0));
a_compare = b_compare = 0; /* gcc-3.4.2 sucks at figuring initialized'ness */
if (a_edge_rect->side_type == META_DIRECTION_LEFT ||
a_edge_rect->side_type == META_DIRECTION_RIGHT)
{
a_compare = a_edge_rect->rect.x;
b_compare = b_edge_rect->rect.x;
if (a_compare == b_compare)
{
a_compare = a_edge_rect->rect.y;
b_compare = b_edge_rect->rect.y;
}
}
else if (a_edge_rect->side_type == META_DIRECTION_TOP ||
a_edge_rect->side_type == META_DIRECTION_BOTTOM)
{
a_compare = a_edge_rect->rect.y;
b_compare = b_edge_rect->rect.y;
if (a_compare == b_compare)
{
a_compare = a_edge_rect->rect.x;
b_compare = b_edge_rect->rect.x;
}
}
else
g_assert ("Some idiot wanted to sort sides of different types.\n");
return a_compare - b_compare; /* positive value denotes a > b ... */
}
/* To make things easily testable, provide a nice way of sorting edges */
gint
meta_rectangle_edge_cmp (gconstpointer a, gconstpointer b)
{
const MetaEdge *a_edge_rect = (gconstpointer) a;
const MetaEdge *b_edge_rect = (gconstpointer) b;
int a_compare, b_compare;
a_compare = a_edge_rect->side_type;
b_compare = b_edge_rect->side_type;
if (a_compare == b_compare)
return meta_rectangle_edge_cmp_ignore_type (a, b);
return a_compare - b_compare; /* positive value denotes a > b ... */
}
/* Determine whether two given edges overlap */
static gboolean
edges_overlap (const MetaEdge *edge1,
const MetaEdge *edge2)
{
if (edge1->rect.width == 0 && edge2->rect.width == 0)
{
return meta_rectangle_vert_overlap (&edge1->rect, &edge2->rect) &&
edge1->rect.x == edge2->rect.x;
}
else if (edge1->rect.height == 0 && edge2->rect.height == 0)
{
return meta_rectangle_horiz_overlap (&edge1->rect, &edge2->rect) &&
edge1->rect.y == edge2->rect.y;
}
else
{
return FALSE;
}
}
static gboolean
rectangle_and_edge_intersection (const MetaRectangle *rect,
const MetaEdge *edge,
MetaEdge *overlap,
int *handle_type)
{
const MetaRectangle *rect2 = &edge->rect;
MetaRectangle *result = &overlap->rect;
gboolean intersect = TRUE;
/* We don't know how to set these, so set them to invalid values */
overlap->edge_type = -1;
overlap->side_type = -1;
/* Figure out what the intersection is */
result->x = MAX (rect->x, rect2->x);
result->y = MAX (rect->y, rect2->y);
result->width = MIN (BOX_RIGHT (*rect), BOX_RIGHT (*rect2)) - result->x;
result->height = MIN (BOX_BOTTOM (*rect), BOX_BOTTOM (*rect2)) - result->y;
/* Find out if the intersection is empty; have to do it this way since
* edges have a thickness of 0
*/
if ((result->width < 0 || result->height < 0) ||
(result->width == 0 && result->height == 0))
{
result->width = 0;
result->height = 0;
intersect = FALSE;
}
else
{
/* Need to figure out the handle_type, a somewhat weird quantity:
* 0 - overlap is in middle of rect
* -1 - overlap is at the side of rect, and is on the opposite side
* of rect than the edge->side_type side
* 1 - overlap is at the side of rect, and the side of rect it is
* on is the edge->side_type side
*/
switch (edge->side_type)
{
case META_DIRECTION_LEFT:
if (result->x == rect->x)
*handle_type = 1;
else if (result->x == BOX_RIGHT (*rect))
*handle_type = -1;
else
*handle_type = 0;
break;
case META_DIRECTION_RIGHT:
if (result->x == rect->x)
*handle_type = -1;
else if (result->x == BOX_RIGHT (*rect))
*handle_type = 1;
else
*handle_type = 0;
break;
case META_DIRECTION_TOP:
if (result->y == rect->y)
*handle_type = 1;
else if (result->y == BOX_BOTTOM (*rect))
*handle_type = -1;
else
*handle_type = 0;
break;
case META_DIRECTION_BOTTOM:
if (result->y == rect->y)
*handle_type = -1;
else if (result->y == BOX_BOTTOM (*rect))
*handle_type = 1;
else
*handle_type = 0;
break;
default:
g_assert_not_reached ();
}
}
return intersect;
}
/* Add all edges of the given rect to cur_edges and return the result. If
* rect_is_internal is false, the side types are switched (LEFT<->RIGHT and
* TOP<->BOTTOM).
*/
static GList*
add_edges (GList *cur_edges,
const MetaRectangle *rect,
gboolean rect_is_internal)
{
MetaEdge *temp_edge;
int i;
for (i=0; i<4; i++)
{
temp_edge = g_new (MetaEdge, 1);
temp_edge->rect = *rect;
switch (i)
{
case 0:
temp_edge->side_type =
rect_is_internal ? META_DIRECTION_LEFT : META_DIRECTION_RIGHT;
temp_edge->rect.width = 0;
break;
case 1:
temp_edge->side_type =
rect_is_internal ? META_DIRECTION_RIGHT : META_DIRECTION_LEFT;
temp_edge->rect.x += temp_edge->rect.width;
temp_edge->rect.width = 0;
break;
case 2:
temp_edge->side_type =
rect_is_internal ? META_DIRECTION_TOP : META_DIRECTION_BOTTOM;
temp_edge->rect.height = 0;
break;
case 3:
temp_edge->side_type =
rect_is_internal ? META_DIRECTION_BOTTOM : META_DIRECTION_TOP;
temp_edge->rect.y += temp_edge->rect.height;
temp_edge->rect.height = 0;
break;
}
temp_edge->edge_type = META_EDGE_SCREEN;
cur_edges = g_list_prepend (cur_edges, temp_edge);
}
return cur_edges;
}
/* Remove any part of old_edge that intersects remove and add any resulting
* edges to cur_list. Return cur_list when finished.
*/
static GList*
split_edge (GList *cur_list,
const MetaEdge *old_edge,
const MetaEdge *remove)
{
MetaEdge *temp_edge;
switch (old_edge->side_type)
{
case META_DIRECTION_LEFT:
case META_DIRECTION_RIGHT:
g_assert (meta_rectangle_vert_overlap (&old_edge->rect, &remove->rect));
if (BOX_TOP (old_edge->rect) < BOX_TOP (remove->rect))
{
temp_edge = g_new (MetaEdge, 1);
*temp_edge = *old_edge;
temp_edge->rect.height = BOX_TOP (remove->rect)
- BOX_TOP (old_edge->rect);
cur_list = g_list_prepend (cur_list, temp_edge);
}
if (BOX_BOTTOM (old_edge->rect) > BOX_BOTTOM (remove->rect))
{
temp_edge = g_new (MetaEdge, 1);
*temp_edge = *old_edge;
temp_edge->rect.y = BOX_BOTTOM (remove->rect);
temp_edge->rect.height = BOX_BOTTOM (old_edge->rect)
- BOX_BOTTOM (remove->rect);
cur_list = g_list_prepend (cur_list, temp_edge);
}
break;
case META_DIRECTION_TOP:
case META_DIRECTION_BOTTOM:
g_assert (meta_rectangle_horiz_overlap (&old_edge->rect, &remove->rect));
if (BOX_LEFT (old_edge->rect) < BOX_LEFT (remove->rect))
{
temp_edge = g_new (MetaEdge, 1);
*temp_edge = *old_edge;
temp_edge->rect.width = BOX_LEFT (remove->rect)
- BOX_LEFT (old_edge->rect);
cur_list = g_list_prepend (cur_list, temp_edge);
}
if (BOX_RIGHT (old_edge->rect) > BOX_RIGHT (remove->rect))
{
temp_edge = g_new (MetaEdge, 1);
*temp_edge = *old_edge;
temp_edge->rect.x = BOX_RIGHT (remove->rect);
temp_edge->rect.width = BOX_RIGHT (old_edge->rect)
- BOX_RIGHT (remove->rect);
cur_list = g_list_prepend (cur_list, temp_edge);
}
break;
default:
g_assert_not_reached ();
}
return cur_list;
}
/* Split up edge and remove preliminary edges from strut_edges depending on
* if and how rect and edge intersect.
*/
static void
fix_up_edges (MetaRectangle *rect, MetaEdge *edge,
GList **strut_edges, GList **edge_splits,
gboolean *edge_needs_removal)
{
MetaEdge overlap;
int handle_type;
if (!rectangle_and_edge_intersection (rect, edge, &overlap, &handle_type))
return;
if (handle_type == 0 || handle_type == 1)
{
/* Put the result of removing overlap from edge into edge_splits */
*edge_splits = split_edge (*edge_splits, edge, &overlap);
*edge_needs_removal = TRUE;
}
if (handle_type == -1 || handle_type == 1)
{
/* Remove the overlap from strut_edges */
/* First, loop over the edges of the strut */
GList *tmp = *strut_edges;
while (tmp)
{
MetaEdge *cur = tmp->data;
/* If this is the edge that overlaps, then we need to split it */
if (edges_overlap (cur, &overlap))
{
GList *delete_me = tmp;
/* Split this edge into some new ones */
*strut_edges = split_edge (*strut_edges, cur, &overlap);
/* Delete the old one */
tmp = tmp->next;
g_free (cur);
*strut_edges = g_list_delete_link (*strut_edges, delete_me);
}
else
tmp = tmp->next;
}
}
}
/* This function removes intersections of edges with the rectangles from the
* list of edges.
*/
GList*
meta_rectangle_remove_intersections_with_boxes_from_edges (
GList *edges,
const GSList *rectangles)
{
const GSList *rect_iter;
const int opposing = 1;
/* Now remove all intersections of rectangles with the edge list */
rect_iter = rectangles;
while (rect_iter)
{
MetaRectangle *rect = rect_iter->data;
GList *edge_iter = edges;
while (edge_iter)
{
MetaEdge *edge = edge_iter->data;
MetaEdge overlap;
int handle;
gboolean edge_iter_advanced = FALSE;
/* If this edge overlaps with this rect... */
if (rectangle_and_edge_intersection (rect, edge, &overlap, &handle))
{
/* "Intersections" where the edges touch but are opposite
* sides (e.g. a left edge against the right edge) should not
* be split. Note that the comments in
* rectangle_and_edge_intersection() say that opposing edges
* occur when handle is -1, BUT you need to remember that we
* treat the left side of a window as a right edge because
* it's what the right side of the window being moved should
* be-resisted-by/snap-to. So opposing is really 1. Anyway,
* we just keep track of it in the opposing constant set up
* above and if handle isn't equal to that, then we know the
* edge should be split.
*/
if (handle != opposing)
{
/* Keep track of this edge so we can delete it below */
GList *delete_me = edge_iter;
edge_iter = edge_iter->next;
edge_iter_advanced = TRUE;
/* Split the edge and add the result to beginning of edges */
edges = split_edge (edges, edge, &overlap);
/* Now free the edge... */
g_free (edge);
edges = g_list_delete_link (edges, delete_me);
}
}
if (!edge_iter_advanced)
edge_iter = edge_iter->next;
}
rect_iter = rect_iter->next;
}
return edges;
}
/* This function is trying to find all the edges of an onscreen region. */
GList*
meta_rectangle_find_onscreen_edges (const MetaRectangle *basic_rect,
const GSList *all_struts)
{
GList *ret;
GList *fixed_strut_rects;
GList *edge_iter;
const GList *strut_rect_iter;
/* The algorithm is basically as follows:
* Make sure the struts are disjoint
* Initialize the edge_set to the edges of basic_rect
* Foreach strut:
* Put together a preliminary new edge from the edges of the strut
* Foreach edge in edge_set:
* - Split the edge if it is partially contained inside the strut
* - If the edge matches an edge of the strut (i.e. a strut just
* against the edge of the screen or a not-next-to-edge-of-screen
* strut adjacent to another), then both the edge from the
* edge_set and the preliminary edge for the strut will need to
* be split
* Add any remaining "preliminary" strut edges to the edge_set
*/
/* Make sure the struts are disjoint */
fixed_strut_rects =
get_disjoint_strut_rect_list_in_region (all_struts, basic_rect);
/* Start off the list with the edges of basic_rect */
ret = add_edges (NULL, basic_rect, TRUE);
strut_rect_iter = fixed_strut_rects;
while (strut_rect_iter)
{
MetaRectangle *strut_rect = (MetaRectangle*) strut_rect_iter->data;
/* Get the new possible edges we may need to add from the strut */
GList *new_strut_edges = add_edges (NULL, strut_rect, FALSE);
edge_iter = ret;
while (edge_iter)
{
MetaEdge *cur_edge = edge_iter->data;
GList *splits_of_cur_edge = NULL;
gboolean edge_needs_removal = FALSE;
fix_up_edges (strut_rect, cur_edge,
&new_strut_edges, &splits_of_cur_edge,
&edge_needs_removal);
if (edge_needs_removal)
{
/* Delete the old edge */
GList *delete_me = edge_iter;
edge_iter = edge_iter->next;
g_free (cur_edge);
ret = g_list_delete_link (ret, delete_me);
/* Add the new split parts of the edge */
ret = g_list_concat (splits_of_cur_edge, ret);
}
else
{
edge_iter = edge_iter->next;
}
/* edge_iter was already advanced above */
}
ret = g_list_concat (new_strut_edges, ret);
strut_rect_iter = strut_rect_iter->next;
}
/* Sort the list */
ret = g_list_sort (ret, meta_rectangle_edge_cmp);
/* Free the fixed struts list */
meta_rectangle_free_list_and_elements (fixed_strut_rects);
return ret;
}
GList*
meta_rectangle_find_nonintersected_xinerama_edges (
const GList *xinerama_rects,
const GSList *all_struts)
{
/* This function cannot easily be merged with
* meta_rectangle_find_onscreen_edges() because real screen edges
* and strut edges both are of the type "there ain't anything
* immediately on the other side"; xinerama edges are different.
*/
GList *ret;
const GList *cur;
GSList *temp_rects;
/* Initialize the return list to be empty */
ret = NULL;
/* start of ret with all the edges of xineramas that are adjacent to
* another xinerama.
*/
cur = xinerama_rects;
while (cur)
{
MetaRectangle *cur_rect = cur->data;
const GList *compare = xinerama_rects;
while (compare)
{
MetaRectangle *compare_rect = compare->data;
/* Check if cur might be horizontally adjacent to compare */
if (meta_rectangle_vert_overlap(cur_rect, compare_rect))
{
MetaDirection side_type;
int y = MAX (cur_rect->y, compare_rect->y);
int height = MIN (BOX_BOTTOM (*cur_rect) - y,
BOX_BOTTOM (*compare_rect) - y);
int width = 0;
int x;
if (BOX_LEFT (*cur_rect) == BOX_RIGHT (*compare_rect))
{
/* compare_rect is to the left of cur_rect */
x = BOX_LEFT (*cur_rect);
side_type = META_DIRECTION_LEFT;
}
else if (BOX_RIGHT (*cur_rect) == BOX_LEFT (*compare_rect))
{
/* compare_rect is to the right of cur_rect */
x = BOX_RIGHT (*cur_rect);
side_type = META_DIRECTION_RIGHT;
}
else
/* These rectangles aren't adjacent after all */
x = INT_MIN;
/* If the rectangles really are adjacent */
if (x != INT_MIN)
{
/* We need a left edge for the xinerama on the right, and
* a right edge for the xinerama on the left. Just fill
* up the edges and stick 'em on the list.
*/
MetaEdge *new_edge = g_new (MetaEdge, 1);
new_edge->rect = meta_rect (x, y, width, height);
new_edge->side_type = side_type;
new_edge->edge_type = META_EDGE_XINERAMA;
ret = g_list_prepend (ret, new_edge);
}
}
/* Check if cur might be vertically adjacent to compare */
if (meta_rectangle_horiz_overlap(cur_rect, compare_rect))
{
MetaDirection side_type;
int x = MAX (cur_rect->x, compare_rect->x);
int width = MIN (BOX_RIGHT (*cur_rect) - x,
BOX_RIGHT (*compare_rect) - x);
int height = 0;
int y;
if (BOX_TOP (*cur_rect) == BOX_BOTTOM (*compare_rect))
{
/* compare_rect is to the top of cur_rect */
y = BOX_TOP (*cur_rect);
side_type = META_DIRECTION_TOP;
}
else if (BOX_BOTTOM (*cur_rect) == BOX_TOP (*compare_rect))
{
/* compare_rect is to the bottom of cur_rect */
y = BOX_BOTTOM (*cur_rect);
side_type = META_DIRECTION_BOTTOM;
}
else
/* These rectangles aren't adjacent after all */
y = INT_MIN;
/* If the rectangles really are adjacent */
if (y != INT_MIN)
{
/* We need a top edge for the xinerama on the bottom, and
* a bottom edge for the xinerama on the top. Just fill
* up the edges and stick 'em on the list.
*/
MetaEdge *new_edge = g_new (MetaEdge, 1);
new_edge->rect = meta_rect (x, y, width, height);
new_edge->side_type = side_type;
new_edge->edge_type = META_EDGE_XINERAMA;
ret = g_list_prepend (ret, new_edge);
}
}
compare = compare->next;
}
cur = cur->next;
}
temp_rects = NULL;
for (; all_struts; all_struts = all_struts->next)
temp_rects = g_slist_prepend (temp_rects,
&((MetaStrut*)all_struts->data)->rect);
ret = meta_rectangle_remove_intersections_with_boxes_from_edges (ret,
temp_rects);
g_slist_free (temp_rects);
/* Sort the list */
ret = g_list_sort (ret, meta_rectangle_edge_cmp);
return ret;
}
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