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/*
* 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 "port.h"
#include "libs/graphics/bbox.h"
TFB_BoundingBox TFB_BBox;
int maxWidth;
int maxHeight;
void
TFB_BBox_Init (int width, int height)
{
maxWidth = width;
maxHeight = height;
TFB_BBox.clip.extent.width = width;
TFB_BBox.clip.extent.height = height;
}
void
TFB_BBox_Reset (void)
{
TFB_BBox.valid = 0;
}
void
TFB_BBox_SetClipRect (const RECT *r)
{
if (!r)
{ /* No clipping -- full rect */
TFB_BBox.clip.corner.x = 0;
TFB_BBox.clip.corner.y = 0;
TFB_BBox.clip.extent.width = maxWidth;
TFB_BBox.clip.extent.height = maxHeight;
return;
}
TFB_BBox.clip = *r;
/* Make sure the cliprect is sane */
if (TFB_BBox.clip.corner.x < 0)
TFB_BBox.clip.corner.x = 0;
if (TFB_BBox.clip.corner.y < 0)
TFB_BBox.clip.corner.y = 0;
if (TFB_BBox.clip.corner.x + TFB_BBox.clip.extent.width > maxWidth)
TFB_BBox.clip.extent.width = maxWidth - TFB_BBox.clip.corner.x;
if (TFB_BBox.clip.corner.y + TFB_BBox.clip.extent.height > maxHeight)
TFB_BBox.clip.extent.height = maxHeight - TFB_BBox.clip.corner.y;
}
void
TFB_BBox_RegisterPoint (int x, int y)
{
int x1 = TFB_BBox.clip.corner.x;
int y1 = TFB_BBox.clip.corner.y;
int x2 = TFB_BBox.clip.corner.x + TFB_BBox.clip.extent.width - 1;
int y2 = TFB_BBox.clip.corner.y + TFB_BBox.clip.extent.height - 1;
/* Constrain coordinates */
if (x < x1) x = x1;
if (x >= x2) x = x2;
if (y < y1) y = y1;
if (y >= y2) y = y2;
/* Is this the first point? If so, set a pixel-region and return. */
if (!TFB_BBox.valid)
{
TFB_BBox.valid = 1;
TFB_BBox.region.corner.x = x;
TFB_BBox.region.corner.y = y;
TFB_BBox.region.extent.width = 1;
TFB_BBox.region.extent.height = 1;
return;
}
/* Otherwise expand the rectangle if necessary. */
x1 = TFB_BBox.region.corner.x;
y1 = TFB_BBox.region.corner.y;
x2 = TFB_BBox.region.corner.x + TFB_BBox.region.extent.width - 1;
y2 = TFB_BBox.region.corner.y + TFB_BBox.region.extent.height - 1;
if (x < x1) {
TFB_BBox.region.corner.x = x;
TFB_BBox.region.extent.width += x1 - x;
}
if (y < y1) {
TFB_BBox.region.corner.y = y;
TFB_BBox.region.extent.height += y1 - y;
}
if (x > x2) {
TFB_BBox.region.extent.width += x - x2;
}
if (y > y2) {
TFB_BBox.region.extent.height += y - y2;
}
}
void
TFB_BBox_RegisterRect (const RECT *r)
{
/* RECT will still register as a corner point of the cliprect even
* if it does not intersect with the cliprect at all. This is not
* a problem, as more is not less. */
TFB_BBox_RegisterPoint (r->corner.x, r->corner.y);
TFB_BBox_RegisterPoint (r->corner.x + r->extent.width - 1,
r->corner.y + r->extent.height - 1);
}
void
TFB_BBox_RegisterCanvas (TFB_Canvas c, int x, int y)
{
RECT r;
r.corner.x = x;
r.corner.y = y;
TFB_DrawCanvas_GetExtent (c, &r.extent);
TFB_BBox_RegisterRect (&r);
}
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