mirror of
https://github.com/xdsopl/robot36.git
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52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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/*
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Copyright 2014 Ahmet Inan <xdsopl@googlemail.com>
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#include <math.h>
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#include <stdio.h>
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double gauss(double x, double radius)
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{
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double sigma = radius / 3.0;
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return radius ? exp(- x * x / (2.0 * sigma * sigma)) / sqrt(2.0 * M_PI * sigma * sigma) : 1.0;
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}
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void emit(int radius)
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{
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printf("\t\tif (i < %d || (buffer_length - %d) <= i)\n\t\t\treturn 0;\n", radius, radius);
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int sum = 0;
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for (int i = -radius; i <= radius; ++i)
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sum += 16384 * gauss(i, radius);
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int factor = (16384 * 16384) / (sum + 1);
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for (int i = -radius; i <= radius; ++i)
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printf("\t\t%s%d * value_buffer[i%s%d]%s\n",
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i != -radius ? "\t" : "return (",
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(int)(factor * gauss(i, radius)),
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i < 0 ? "" : "+",
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i,
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i != radius ? " +" : ") >> 14;"
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);
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}
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int main()
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{
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printf("/* code generated by 'utils/blur.c' */\n");
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printf("static uchar value_blur(int i)\n{\n\tswitch (blur_power) {\n");
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for (int i = 0; i < 7; ++i) {
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printf("\tcase %d:\n", i);
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emit((1 << i) | 1);
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}
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printf("\tdefault:\n\t\treturn value_buffer[i];\n\t}\n\treturn 0;\n}\n");
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return 0;
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}
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