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Diffstat (limited to 'intern/cycles/util/rect.h')
-rw-r--r-- | intern/cycles/util/rect.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/intern/cycles/util/rect.h b/intern/cycles/util/rect.h new file mode 100644 index 00000000000..79d64b917b7 --- /dev/null +++ b/intern/cycles/util/rect.h @@ -0,0 +1,75 @@ +/* + * 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/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, + ccl_private int *x, + ccl_private 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__ */ |