moved code generator to utils/blur.c, moved generated code to blur_generated.rsh

utils/.gitignore

@@ -0,0 +1 @@
+blur

utils/Makefile

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+CFLAGS = -std=gnu99 -W -Wall -O3
+LDFLAGS = -lm
+
+generate: blur
+	./blur > ../app/src/main/rs/blur_generated.rsh
+
+blur: blur.c

utils/blur.c

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