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