mutter/cogl/cogl-atlas.c

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include "cogl-atlas.h"
#include "cogl-debug.h"
/* Implements a data structure which keeps track of unused
sub-rectangles within a larger rectangle using a binary tree
structure. The algorithm for this is based on the description here:
http://www.blackpawn.com/texts/lightmaps/default.html
*/
#ifdef COGL_ENABLE_DEBUG
/* The cairo header is only used for debugging to generate an image of
the atlas */
#include <cairo.h>
static void _cogl_atlas_dump_image (CoglAtlas *atlas);
#endif /* COGL_ENABLE_DEBUG */
typedef struct _CoglAtlasNode CoglAtlasNode;
typedef struct _CoglAtlasStackEntry CoglAtlasStackEntry;
typedef void (* CoglAtlasInternalForeachCb) (CoglAtlasNode *node,
gpointer data);
typedef enum
{
COGL_ATLAS_BRANCH,
COGL_ATLAS_FILLED_LEAF,
COGL_ATLAS_EMPTY_LEAF
} CoglAtlasNodeType;
struct _CoglAtlas
{
CoglAtlasNode *root;
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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unsigned int space_remaining;
unsigned int n_rectangles;
GDestroyNotify value_destroy_func;
};
struct _CoglAtlasNode
{
CoglAtlasNodeType type;
CoglAtlasRectangle rectangle;
CoglAtlasNode *parent;
union
{
/* Fields used when this is a branch */
struct
{
CoglAtlasNode *left;
CoglAtlasNode *right;
} branch;
/* Field used when this is a filled leaf */
gpointer data;
} d;
};
struct _CoglAtlasStackEntry
{
/* The node to search */
CoglAtlasNode *node;
/* Index of next branch of this node to explore. Basically either 0
to go left or 1 to go right */
gboolean next_index;
/* Next entry in the stack */
CoglAtlasStackEntry *next;
};
static CoglAtlasNode *
_cogl_atlas_node_new (void)
{
return g_slice_new (CoglAtlasNode);
}
static void
_cogl_atlas_node_free (CoglAtlasNode *node)
{
g_slice_free (CoglAtlasNode, node);
}
CoglAtlas *
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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_cogl_atlas_new (unsigned int width,
unsigned int height,
GDestroyNotify value_destroy_func)
{
CoglAtlas *atlas = g_new (CoglAtlas, 1);
CoglAtlasNode *root = _cogl_atlas_node_new ();
root->type = COGL_ATLAS_EMPTY_LEAF;
root->parent = NULL;
root->rectangle.x = 0;
root->rectangle.y = 0;
root->rectangle.width = width;
root->rectangle.height = height;
atlas->root = root;
atlas->space_remaining = width * height;
atlas->n_rectangles = 0;
atlas->value_destroy_func = value_destroy_func;
return atlas;
}
static CoglAtlasStackEntry *
_cogl_atlas_stack_push (CoglAtlasStackEntry *stack,
CoglAtlasNode *node,
gboolean next_index)
{
CoglAtlasStackEntry *new_entry = g_slice_new (CoglAtlasStackEntry);
new_entry->node = node;
new_entry->next_index = next_index;
new_entry->next = stack;
return new_entry;
}
static CoglAtlasStackEntry *
_cogl_atlas_stack_pop (CoglAtlasStackEntry *stack)
{
CoglAtlasStackEntry *next = stack->next;
g_slice_free (CoglAtlasStackEntry, stack);
return next;
}
static CoglAtlasNode *
_cogl_atlas_node_split_horizontally (CoglAtlasNode *node,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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unsigned int left_width)
{
/* Splits the node horizontally (according to emacs' definition, not
vim) by converting it to a branch and adding two new leaf
nodes. The leftmost branch will have the width left_width and
will be returned. If the node is already just the right size it
won't do anything */
CoglAtlasNode *left_node, *right_node;
if (node->rectangle.width == left_width)
return node;
left_node = _cogl_atlas_node_new ();
left_node->type = COGL_ATLAS_EMPTY_LEAF;
left_node->parent = node;
left_node->rectangle.x = node->rectangle.x;
left_node->rectangle.y = node->rectangle.y;
left_node->rectangle.width = left_width;
left_node->rectangle.height = node->rectangle.height;
node->d.branch.left = left_node;
right_node = _cogl_atlas_node_new ();
right_node->type = COGL_ATLAS_EMPTY_LEAF;
right_node->parent = node;
right_node->rectangle.x = node->rectangle.x + left_width;
right_node->rectangle.y = node->rectangle.y;
right_node->rectangle.width = node->rectangle.width - left_width;
right_node->rectangle.height = node->rectangle.height;
node->d.branch.right = right_node;
node->type = COGL_ATLAS_BRANCH;
return left_node;
}
static CoglAtlasNode *
_cogl_atlas_node_split_vertically (CoglAtlasNode *node,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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unsigned int top_height)
{
/* Splits the node vertically (according to emacs' definition, not
vim) by converting it to a branch and adding two new leaf
nodes. The topmost branch will have the height top_height and
will be returned. If the node is already just the right size it
won't do anything */
CoglAtlasNode *top_node, *bottom_node;
if (node->rectangle.height == top_height)
return node;
top_node = _cogl_atlas_node_new ();
top_node->type = COGL_ATLAS_EMPTY_LEAF;
top_node->parent = node;
top_node->rectangle.x = node->rectangle.x;
top_node->rectangle.y = node->rectangle.y;
top_node->rectangle.width = node->rectangle.width;
top_node->rectangle.height = top_height;
node->d.branch.left = top_node;
bottom_node = _cogl_atlas_node_new ();
bottom_node->type = COGL_ATLAS_EMPTY_LEAF;
bottom_node->parent = node;
bottom_node->rectangle.x = node->rectangle.x;
bottom_node->rectangle.y = node->rectangle.y + top_height;
bottom_node->rectangle.width = node->rectangle.width;
bottom_node->rectangle.height = node->rectangle.height - top_height;
node->d.branch.right = bottom_node;
node->type = COGL_ATLAS_BRANCH;
return top_node;
}
gboolean
_cogl_atlas_add_rectangle (CoglAtlas *atlas,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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unsigned int width,
unsigned int height,
gpointer data,
CoglAtlasRectangle *rectangle)
{
/* Stack of nodes to search in */
CoglAtlasStackEntry *node_stack;
CoglAtlasNode *found_node = NULL;
/* Zero-sized rectangles break the algorithm for removing rectangles
so we'll disallow them */
g_return_val_if_fail (width > 0 && height > 0, FALSE);
/* Start with the root node */
node_stack = _cogl_atlas_stack_push (NULL, atlas->root, FALSE);
/* Depth-first search for an empty node that is big enough */
while (node_stack)
{
/* Pop an entry off the stack */
CoglAtlasNode *node = node_stack->node;
int next_index = node_stack->next_index;
node_stack = _cogl_atlas_stack_pop (node_stack);
/* Regardless of the type of the node, there's no point
descending any further if the new rectangle won't fit within
it */
if (node->rectangle.width >= width &&
node->rectangle.height >= height)
{
if (node->type == COGL_ATLAS_EMPTY_LEAF)
{
/* We've found a node we can use */
found_node = node;
break;
}
else if (node->type == COGL_ATLAS_BRANCH)
{
if (next_index)
/* Try the right branch */
node_stack = _cogl_atlas_stack_push (node_stack,
node->d.branch.right,
0);
else
{
/* Make sure we remember to try the right branch once
we've finished descending the left branch */
node_stack = _cogl_atlas_stack_push (node_stack,
node,
1);
/* Try the left branch */
node_stack = _cogl_atlas_stack_push (node_stack,
node->d.branch.left,
0);
}
}
}
}
/* Free the stack */
while (node_stack)
node_stack = _cogl_atlas_stack_pop (node_stack);
if (found_node)
{
/* Split according to whichever axis will leave us with the
largest space */
if (found_node->rectangle.width - width >
found_node->rectangle.height - height)
{
found_node = _cogl_atlas_node_split_horizontally (found_node, width);
found_node = _cogl_atlas_node_split_vertically (found_node, height);
}
else
{
found_node = _cogl_atlas_node_split_vertically (found_node, height);
found_node = _cogl_atlas_node_split_horizontally (found_node, width);
}
found_node->type = COGL_ATLAS_FILLED_LEAF;
found_node->d.data = data;
if (rectangle)
*rectangle = found_node->rectangle;
/* Record how much empty space is remaining after this rectangle
is added */
g_assert (width * height <= atlas->space_remaining);
atlas->space_remaining -= width * height;
atlas->n_rectangles++;
#ifdef COGL_ENABLE_DEBUG
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DUMP_ATLAS_IMAGE))
_cogl_atlas_dump_image (atlas);
#endif
return TRUE;
}
else
return FALSE;
}
void
_cogl_atlas_remove_rectangle (CoglAtlas *atlas,
const CoglAtlasRectangle *rectangle)
{
CoglAtlasNode *node = atlas->root;
/* We can do a binary-chop down the search tree to find the rectangle */
while (node->type == COGL_ATLAS_BRANCH)
{
CoglAtlasNode *left_node = node->d.branch.left;
/* If and only if the rectangle is in the left node then the x,y
position of the rectangle will be within the node's
rectangle */
if (rectangle->x < left_node->rectangle.x + left_node->rectangle.width &&
rectangle->y < left_node->rectangle.y + left_node->rectangle.height)
/* Go left */
node = left_node;
else
/* Go right */
node = node->d.branch.right;
}
/* Make sure we found the right node */
if (node->type != COGL_ATLAS_FILLED_LEAF ||
node->rectangle.x != rectangle->x ||
node->rectangle.y != rectangle->y ||
node->rectangle.width != rectangle->width ||
node->rectangle.height != rectangle->height)
/* This should only happen if someone tried to remove a rectangle
that was not in the atlas so something has gone wrong */
g_return_if_reached ();
else
{
/* Convert the node back to an empty node */
if (atlas->value_destroy_func)
atlas->value_destroy_func (node->d.data);
node->type = COGL_ATLAS_EMPTY_LEAF;
/* Walk back up the tree combining branch nodes that have two
empty leaves back into a single empty leaf */
for (node = node->parent; node; node = node->parent)
{
/* This node is a parent so it should always be a branch */
g_assert (node->type == COGL_ATLAS_BRANCH);
if (node->d.branch.left->type == COGL_ATLAS_EMPTY_LEAF &&
node->d.branch.right->type == COGL_ATLAS_EMPTY_LEAF)
{
_cogl_atlas_node_free (node->d.branch.left);
_cogl_atlas_node_free (node->d.branch.right);
node->type = COGL_ATLAS_EMPTY_LEAF;
}
else
break;
}
/* There is now more free space and one less rectangle */
atlas->space_remaining += rectangle->width * rectangle->height;
g_assert (atlas->n_rectangles > 0);
atlas->n_rectangles--;
}
#ifdef COGL_ENABLE_DEBUG
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DUMP_ATLAS_IMAGE))
_cogl_atlas_dump_image (atlas);
#endif
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
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unsigned int
_cogl_atlas_get_width (CoglAtlas *atlas)
{
return atlas->root->rectangle.width;
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
unsigned int
_cogl_atlas_get_height (CoglAtlas *atlas)
{
return atlas->root->rectangle.height;
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
unsigned int
_cogl_atlas_get_remaining_space (CoglAtlas *atlas)
{
return atlas->space_remaining;
}
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-09 20:57:32 -05:00
unsigned int
_cogl_atlas_get_n_rectangles (CoglAtlas *atlas)
{
return atlas->n_rectangles;
}
static void
_cogl_atlas_internal_foreach (CoglAtlas *atlas,
CoglAtlasInternalForeachCb callback,
gpointer data)
{
/* Stack of nodes to search in */
CoglAtlasStackEntry *node_stack;
/* Start with the root node */
node_stack = _cogl_atlas_stack_push (NULL, atlas->root, 0);
/* Iterate all nodes depth-first */
while (node_stack)
{
CoglAtlasNode *node = node_stack->node;
switch (node->type)
{
case COGL_ATLAS_BRANCH:
if (node_stack->next_index == 0)
{
/* Next time we come back to this node, go to the right */
node_stack->next_index = 1;
/* Explore the left branch next */
node_stack = _cogl_atlas_stack_push (node_stack,
node->d.branch.left,
0);
}
else if (node_stack->next_index == 1)
{
/* Next time we come back to this node, stop processing it */
node_stack->next_index = 2;
/* Explore the right branch next */
node_stack = _cogl_atlas_stack_push (node_stack,
node->d.branch.right,
0);
}
else
{
/* We're finished with this node so we can call the callback */
callback (node, data);
node_stack = _cogl_atlas_stack_pop (node_stack);
}
break;
default:
/* Some sort of leaf node, just call the callback */
callback (node, data);
node_stack = _cogl_atlas_stack_pop (node_stack);
break;
}
}
/* The stack should now be empty */
g_assert (node_stack == NULL);
}
typedef struct _CoglAtlasForeachClosure
{
CoglAtlasCallback callback;
gpointer data;
} CoglAtlasForeachClosure;
static void
_cogl_atlas_foreach_cb (CoglAtlasNode *node, gpointer data)
{
CoglAtlasForeachClosure *closure = data;
if (node->type == COGL_ATLAS_FILLED_LEAF)
closure->callback (&node->rectangle, node->d.data, closure->data);
}
void
_cogl_atlas_foreach (CoglAtlas *atlas,
CoglAtlasCallback callback,
gpointer data)
{
CoglAtlasForeachClosure closure;
closure.callback = callback;
closure.data = data;
_cogl_atlas_internal_foreach (atlas, _cogl_atlas_foreach_cb, &closure);
}
static void
_cogl_atlas_free_cb (CoglAtlasNode *node, gpointer data)
{
CoglAtlas *atlas = data;
if (node->type == COGL_ATLAS_FILLED_LEAF && atlas->value_destroy_func)
atlas->value_destroy_func (node->d.data);
_cogl_atlas_node_free (node);
}
void
_cogl_atlas_free (CoglAtlas *atlas)
{
_cogl_atlas_internal_foreach (atlas, _cogl_atlas_free_cb, atlas);
g_free (atlas);
}
#ifdef COGL_ENABLE_DEBUG
static void
_cogl_atlas_dump_image_cb (CoglAtlasNode *node, gpointer data)
{
cairo_t *cr = data;
if (node->type == COGL_ATLAS_FILLED_LEAF ||
node->type == COGL_ATLAS_EMPTY_LEAF)
{
/* Fill the rectangle using a different colour depending on
whether the rectangle is used */
if (node->type == COGL_ATLAS_FILLED_LEAF)
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
else
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_rectangle (cr,
node->rectangle.x,
node->rectangle.y,
node->rectangle.width,
node->rectangle.height);
cairo_fill_preserve (cr);
/* Draw a white outline around the rectangle */
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_stroke (cr);
}
}
static void
_cogl_atlas_dump_image (CoglAtlas *atlas)
{
/* This dumps a png to help visualize the atlas. Each leaf rectangle
is drawn with a white outline. Unused leaves are filled in black
and used leaves are blue */
cairo_surface_t *surface =
cairo_image_surface_create (CAIRO_FORMAT_RGB24,
_cogl_atlas_get_width (atlas),
_cogl_atlas_get_height (atlas));
cairo_t *cr = cairo_create (surface);
_cogl_atlas_internal_foreach (atlas, _cogl_atlas_dump_image_cb, cr);
cairo_destroy (cr);
cairo_surface_write_to_png (surface, "cogl-atlas-dump.png");
cairo_surface_destroy (surface);
}
#endif /* COGL_ENABLE_DEBUG */