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/*
* Copyright 2017 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __UTIL_RECT_H__
#define __UTIL_RECT_H__
#include "util/util_types.h"
CCL_NAMESPACE_BEGIN
/* Rectangles are represented as a int4 containing the coordinates of the lower-left and
* upper-right corners in the order (x0, y0, x1, y1). */
ccl_device_inline int4 rect_from_shape(int x0, int y0, int w, int h)
{
return make_int4(x0, y0, x0 + w, y0 + h);
}
ccl_device_inline int4 rect_expand(int4 rect, int d)
{
return make_int4(rect.x - d, rect.y - d, rect.z + d, rect.w + d);
}
/* Returns the intersection of two rects. */
ccl_device_inline int4 rect_clip(int4 a, int4 b)
{
return make_int4(max(a.x, b.x), max(a.y, b.y), min(a.z, b.z), min(a.w, b.w));
}
ccl_device_inline bool rect_is_valid(int4 rect)
{
return (rect.z > rect.x) && (rect.w > rect.y);
}
/* Returns the local row-major index of the pixel inside the rect. */
ccl_device_inline int coord_to_local_index(int4 rect, int x, int y)
{
int w = rect.z - rect.x;
return (y - rect.y) * w + (x - rect.x);
}
/* Finds the coordinates of a pixel given by its row-major index in the rect,
* and returns whether the pixel is inside it. */
ccl_device_inline bool local_index_to_coord(int4 rect, int idx, int *x, int *y)
{
int w = rect.z - rect.x;
*x = (idx % w) + rect.x;
*y = (idx / w) + rect.y;
return (*y < rect.w);
}
ccl_device_inline int rect_size(int4 rect)
{
return (rect.z - rect.x) * (rect.w - rect.y);
}
CCL_NAMESPACE_END
#endif /* __UTIL_RECT_H__ */
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