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#include <fitz.h>
/*
* Remove useless overs that only have one child.
*/
static void cleanovers(fz_node *node)
{
fz_node *prev;
fz_node *next;
fz_node *current;
fz_node *child;
prev = nil;
for (current = node->first; current; current = next)
{
next = current->next;
if (fz_isovernode(current))
{
if (current->first == current->last)
{
child = current->first;
fz_removenode(current);
if (child)
{
if (prev)
fz_insertnodeafter(prev, child);
else
fz_insertnodefirst(node, child);
}
current = child;
}
}
if (current)
prev = current;
}
for (current = node->first; current; current = current->next)
cleanovers(current);
}
/*
* Remove rectangular clip-masks whose contents fit...
*/
static int getrect(fz_pathnode *path, fz_rect *bboxp)
{
float x, y, w, h;
/* move x y, line x+w y, line x+w y+h, line x y+h, close */
if (path->len != 13)
return 0;
if (path->els[0].k != FZ_MOVETO) return 0;
x = path->els[1].v;
y = path->els[2].v;
if (path->els[3].k != FZ_LINETO) return 0;
w = path->els[4].v - x;
if (path->els[5].v != y) return 0;
if (path->els[6].k != FZ_LINETO) return 0;
if (path->els[7].v != x + w) return 0;
h = path->els[8].v - y;
if (path->els[9].k != FZ_LINETO) return 0;
if (path->els[10].v != x) return 0;
if (path->els[11].v != y + h) return 0;
if (path->els[12].k != FZ_CLOSEPATH) return 0;
bboxp->min.x = MIN(x, x + w);
bboxp->min.y = MIN(y, y + h);
bboxp->max.x = MAX(x, x + w);
bboxp->max.y = MAX(y, y + h);
return 1;
}
static int fitsinside(fz_node *node, fz_rect clip)
{
fz_rect bbox;
bbox = fz_boundnode(node, fz_identity());
if (fz_isinfiniterect(bbox)) return 0;
if (fz_isemptyrect(bbox)) return 1;
if (bbox.min.x < clip.min.x) return 0;
if (bbox.max.x > clip.max.x) return 0;
if (bbox.min.y < clip.min.y) return 0;
if (bbox.max.y > clip.max.y) return 0;
return 1;
}
static void cleanmasks(fz_node *node)
{
fz_node *prev;
fz_node *current;
fz_node *shape;
fz_node *color;
fz_rect bbox;
prev = nil;
for (current = node->first; current; current = current->next)
{
retry:
if (fz_ismasknode(current))
{
shape = current->first;
color = shape->next;
if (fz_ispathnode(shape))
{
if (getrect((fz_pathnode*)shape, &bbox))
{
if (fitsinside(color, bbox))
{
fz_removenode(current);
if (prev)
fz_insertnodeafter(prev, color);
else
fz_insertnodefirst(node, color);
current = color;
goto retry;
}
}
}
}
prev = current;
}
for (current = node->first; current; current = current->next)
cleanmasks(current);
}
/*
*
*/
fz_error *
fz_optimizetree(fz_tree *tree)
{
if (getenv("DONTOPT"))
return nil;
cleanovers(tree->root);
cleanmasks(tree->root);
return nil;
}
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