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62 lines
1.7 KiB
Python
62 lines
1.7 KiB
Python
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#!/usr/bin/env python
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# Copyright 2024 Google LLC
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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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import math
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# Little tool to generate rounded rect insets, stored as 4 bit uints, packed together into a uint32.
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def calc_lookup(radius, is_bottom):
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insets = [0] * (radius + 1)
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f = 1 - radius;
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ddF_x = 1;
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ddF_y = -2 * radius;
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x = 0;
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y = radius;
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while(x < y):
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if(f >= 0):
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y -= 1
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ddF_y += 2
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f += ddF_y
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x += 1
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ddF_x += 2
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f += ddF_x
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insets[radius - y] = radius - x
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insets[radius - x] = radius - y
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pack = 0
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rng = xrange(0, radius) if (is_bottom) else xrange(radius - 1, -1, -1)
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for i in rng:
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pack = (pack << 4) | insets[i]
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return pack
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def main():
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f = open("roundrect.h", 'wb')
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f.write("static const uint32_t round_top_corner_lookup[] = {\n\t0x0, ")
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for radius in xrange(1, 9):
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f.write("0x%02x, " % calc_lookup(radius, False))
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f.write("\n};\n")
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f.write("static const uint32_t round_bottom_corner_lookup[] = {\n\t0x0, ")
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for radius in xrange(1, 9):
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f.write("0x%02x, " % calc_lookup(radius, True))
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f.write("\n};\n")
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f.close()
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return
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if __name__ == "__main__":
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main()
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