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Simplify descendant bbox calculations.

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svn path=/trunk/netsurf/; revision=11753
This commit is contained in:
Michael Drake 2011-02-22 11:38:19 +00:00
parent b077f15485
commit 9a8341cb39
1 changed files with 41 additions and 40 deletions
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81
render/layout.c
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@ -4486,6 +4486,40 @@ void layout_compute_offsets(struct box *box,
}
/**
* Apply changes to box descendant_[xy][01] values due to given child.
*
* \param box box to update
* \param child a box, which may affect box's descendant bbox
* \param off_x offset to apply to child->x coord to treat as child of box
* \param off_y offset to apply to child->y coord to treat as child of box
*/
static void layout_update_descendant_bbox(struct box *box, struct box *child,
int off_x, int off_y)
{
/* get coordinates of child relative to box */
int child_x = child->x - off_x;
int child_y = child->y - off_y;
/* get child's descendant bbox relative to box */
int child_desc_x0 = child_x + child->descendant_x0;
int child_desc_y0 = child_y + child->descendant_y0;
int child_desc_x1 = child_x + child->descendant_x1;
int child_desc_y1 = child_y + child->descendant_y1;
/* increase box's descendant bbox to contain descendants */
if (child_desc_x0 < box->descendant_x0)
box->descendant_x0 = child_desc_x0;
if (child_desc_y0 < box->descendant_y0)
box->descendant_y0 = child_desc_y0;
if (box->descendant_x1 < child_desc_x1)
box->descendant_x1 = child_desc_x1;
if (box->descendant_y1 < child_desc_y1)
box->descendant_y1 = child_desc_y1;
}
/**
* Recursively calculate the descendant_[xy][01] values for a laid-out box tree.
*
@ -4530,22 +4564,9 @@ void layout_calculate_descendant_bboxes(struct box *box)
child->type == BOX_FLOAT_RIGHT)
continue;
if (child->x + child->descendant_x0 - box->x <
box->descendant_x0)
box->descendant_x0 = child->x +
child->descendant_x0 - box->x;
if (box->descendant_x1 < child->x +
child->descendant_x1 - box->x)
box->descendant_x1 = child->x +
child->descendant_x1 - box->x;
if (child->y + child->descendant_y0 - box->y <
box->descendant_y0)
box->descendant_y0 = child->y +
child->descendant_y0 - box->y;
if (box->descendant_y1 < child->y +
child->descendant_y1 - box->y)
box->descendant_y1 = child->y +
child->descendant_y1 - box->y;
layout_update_descendant_bbox(box, child,
box->x, box->y);
if (child == box->inline_end)
break;
}
@ -4563,14 +4584,7 @@ void layout_calculate_descendant_bboxes(struct box *box)
CSS_OVERFLOW_HIDDEN)
continue;
if (child->x + child->descendant_x0 < box->descendant_x0)
box->descendant_x0 = child->x + child->descendant_x0;
if (box->descendant_x1 < child->x + child->descendant_x1)
box->descendant_x1 = child->x + child->descendant_x1;
if (child->y + child->descendant_y0 < box->descendant_y0)
box->descendant_y0 = child->y + child->descendant_y0;
if (box->descendant_y1 < child->y + child->descendant_y1)
box->descendant_y1 = child->y + child->descendant_y1;
layout_update_descendant_bbox(box, child, 0, 0);
}
for (child = box->float_children; child; child = child->next_float) {
@ -4579,27 +4593,14 @@ void layout_calculate_descendant_bboxes(struct box *box)
layout_calculate_descendant_bboxes(child);
if (child->x + child->descendant_x0 < box->descendant_x0)
box->descendant_x0 = child->x + child->descendant_x0;
if (box->descendant_x1 < child->x + child->descendant_x1)
box->descendant_x1 = child->x + child->descendant_x1;
if (child->y + child->descendant_y0 < box->descendant_y0)
box->descendant_y0 = child->y + child->descendant_y0;
if (box->descendant_y1 < child->y + child->descendant_y1)
box->descendant_y1 = child->y + child->descendant_y1;
layout_update_descendant_bbox(box, child, 0, 0);
}
if (box->list_marker) {
child = box->list_marker;
layout_calculate_descendant_bboxes(child);
if (child->x + child->descendant_x0 < box->descendant_x0)
box->descendant_x0 = child->x + child->descendant_x0;
if (box->descendant_x1 < child->x + child->descendant_x1)
box->descendant_x1 = child->x + child->descendant_x1;
if (child->y + child->descendant_y0 < box->descendant_y0)
box->descendant_y0 = child->y + child->descendant_y0;
if (box->descendant_y1 < child->y + child->descendant_y1)
box->descendant_y1 = child->y + child->descendant_y1;
layout_update_descendant_bbox(box, child, 0, 0);
}
}