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/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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.
*/
#include "android/skin/rect.h"
#include <limits.h>
#define SKIN_POS_INITIALIZER { 0, 0 }
void
skin_pos_rotate( SkinPos* dst, SkinPos* src, SkinRotation rotation )
{
int x = src->x;
int y = src->y;
switch ( rotation & 3 ) {
case SKIN_ROTATION_0:
dst->x = x;
dst->y = y;
break;
case SKIN_ROTATION_90:
dst->x = -y;
dst->y = x;
break;
case SKIN_ROTATION_180:
dst->x = -x;
dst->y = -y;
break;
default:
dst->x = y;
dst->y = -x;
}
}
#define SKIN_SIZE_INITIALIZER { 0, 0 }
int
skin_size_contains( SkinSize* size, int x, int y )
{
return ( (unsigned) x < (unsigned) size->w &&
(unsigned) y < (unsigned) size->h );
}
void
skin_size_rotate( SkinSize* dst, SkinSize* src, SkinRotation rot )
{
int w = src->w;
int h = src->h;
if ((rot & 1) != 0) {
dst->w = h;
dst->h = w;
} else {
dst->w = w;
dst->h = h;
}
}
/** SKIN RECTANGLES
**/
#define SKIN_RECT_INITIALIZER { SKIN_POS_INITIALIZER, SKIN_SIZE_INITIALIZER }
void
skin_rect_init( SkinRect* r, int x, int y, int w, int h )
{
if (w < 0 || h < 0)
x = y = w = h = 0;
r->pos.x = x;
r->pos.y = y;
r->size.w = w;
r->size.h = h;
}
void
skin_rect_translate( SkinRect* r, int dx, int dy )
{
r->pos.x += dx;
r->pos.y += dy;
}
void
skin_rect_rotate( SkinRect* dst, SkinRect* src, SkinRotation rot )
{
int x, y, w, h;
switch (rot & 3) {
case SKIN_ROTATION_90:
x = src->pos.x;
y = src->pos.y;
w = src->size.w;
h = src->size.h;
dst->pos.x = -(y + h);
dst->pos.y = x;
dst->size.w = h;
dst->size.h = w;
break;
case SKIN_ROTATION_180:
dst->pos.x = -(src->pos.x + src->size.w);
dst->pos.y = -(src->pos.y + src->size.h);
dst->size = src->size;
break;
case SKIN_ROTATION_270:
x = src->pos.x;
y = src->pos.y;
w = src->size.w;
h = src->size.h;
dst->pos.x = y;
dst->pos.y = -(x + w);
dst->size.w = h;
dst->size.h = w;
break;
default:
dst[0] = src[0];
}
}
int
skin_rect_contains( SkinRect* r, int x, int y )
{
return ( (unsigned)(x - r->pos.x) < (unsigned)r->size.w &&
(unsigned)(y - r->pos.y) < (unsigned)r->size.h );
}
SkinOverlap
skin_rect_contains_rect( SkinRect *r1, SkinRect *r2 )
{
SkinBox a, b;
skin_box_from_rect( &a, r1 );
skin_box_from_rect( &b, r2 );
if (a.x2 <= b.x1 || b.x2 <= a.x1 || a.y2 <= b.y1 || b.y2 <= a.y1) {
return SKIN_OUTSIDE;
}
if (b.x1 >= a.x1 && b.x2 <= a.x2 && b.y1 >= a.y1 && b.y2 <= a.y2) {
return SKIN_INSIDE;
}
return SKIN_OVERLAP;
}
int
skin_rect_intersect( SkinRect* result, SkinRect* r1, SkinRect* r2 )
{
SkinBox a, b, r;
skin_box_from_rect( &a, r1 );
skin_box_from_rect( &b, r2 );
if (a.x2 <= b.x1 || b.x2 <= a.x1 || a.y2 <= b.y1 || b.y2 <= a.y1) {
result->pos.x = result->pos.y = result->size.w = result->size.h = 0;
return 0;
}
r.x1 = (a.x1 > b.x1) ? a.x1 : b.x1;
r.x2 = (a.x2 < b.x2) ? a.x2 : b.x2;
r.y1 = (a.y1 > b.y1) ? a.y1 : b.y1;
r.y2 = (a.y2 < b.y2) ? a.y2 : b.y2;
skin_box_to_rect( &r, result );
return 1;
}
int
skin_rect_equals( SkinRect* r1, SkinRect* r2 )
{
return (r1->pos.x == r2->pos.x && r1->pos.y == r2->pos.y &&
r1->size.w == r2->size.w && r2->size.h == r2->size.h);
}
/** SKIN BOXES
**/
void
skin_box_minmax_init( SkinBox* box )
{
box->x1 = box->y1 = INT_MAX;
box->x2 = box->y2 = INT_MIN;
}
void
skin_box_minmax_update( SkinBox* a, SkinRect* r )
{
SkinBox b[1];
skin_box_from_rect(b, r);
if (b->x1 < a->x1) a->x1 = b->x1;
if (b->y1 < a->y1) a->y1 = b->y1;
if (b->x2 > a->x2) a->x2 = b->x2;
if (b->y2 > a->y2) a->y2 = b->y2;
}
int
skin_box_minmax_to_rect( SkinBox* box, SkinRect* r )
{
if (box->x1 > box->x2) {
r->pos.x = r->pos.y = r->size.w = r->size.h = 0;
return 0;
}
skin_box_to_rect( box, r );
return 1;
}
void
skin_box_from_rect( SkinBox* box, SkinRect* r )
{
box->x1 = r->pos.x;
box->y1 = r->pos.y;
box->x2 = r->size.w + box->x1;
box->y2 = r->size.h + box->y1;
}
void
skin_box_to_rect( SkinBox* box, SkinRect* r )
{
r->pos.x = box->x1;
r->pos.y = box->y1;
r->size.w = box->x2 - box->x1;
r->size.h = box->y2 - box->y1;
}
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