forked from openkylin/platform_build
144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#define to565(r,g,b) \
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((((r) >> 3) << 11) | (((g) >> 2) << 5) | ((b) >> 3))
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#define from565_r(x) ((((x) >> 11) & 0x1f) * 255 / 31)
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#define from565_g(x) ((((x) >> 5) & 0x3f) * 255 / 63)
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#define from565_b(x) (((x) & 0x1f) * 255 / 31)
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void to_565_raw(void)
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{
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unsigned char in[3];
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unsigned short out;
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while(read(0, in, 3) == 3) {
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out = to565(in[0],in[1],in[2]);
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write(1, &out, 2);
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}
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return;
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}
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void to_565_raw_dither(int width)
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{
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unsigned char in[3];
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unsigned short out;
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int i = 0;
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int e;
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int* error = malloc((width+2) * 3 * sizeof(int));
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int* next_error = malloc((width+2) * 3 * sizeof(int));
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memset(error, 0, (width+2) * 3 * sizeof(int));
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memset(next_error, 0, (width+2) * 3 * sizeof(int));
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error += 3; // array goes from [-3..((width+1)*3+2)]
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next_error += 3;
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while(read(0, in, 3) == 3) {
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int r = in[0] + error[i*3+0];
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int rb = (r < 0) ? 0 : ((r > 255) ? 255 : r);
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int g = in[1] + error[i*3+1];
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int gb = (g < 0) ? 0 : ((g > 255) ? 255 : g);
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int b = in[2] + error[i*3+2];
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int bb = (b < 0) ? 0 : ((b > 255) ? 255 : b);
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out = to565(rb, gb, bb);
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write(1, &out, 2);
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#define apply_error(ch) { \
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next_error[(i-1)*3+ch] += e * 3 / 16; \
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next_error[(i)*3+ch] += e * 5 / 16; \
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next_error[(i+1)*3+ch] += e * 1 / 16; \
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error[(i+1)*3+ch] += e - ((e*1/16) + (e*3/16) + (e*5/16)); \
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}
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e = r - from565_r(out);
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apply_error(0);
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e = g - from565_g(out);
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apply_error(1);
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e = b - from565_b(out);
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apply_error(2);
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#undef apply_error
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++i;
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if (i == width) {
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// error <- next_error; next_error <- 0
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int* temp = error; error = next_error; next_error = temp;
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memset(next_error, 0, (width+1) * 3 * sizeof(int));
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i = 0;
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}
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}
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free(error-3);
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free(next_error-3);
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return;
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}
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void to_565_rle(void)
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{
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unsigned char in[3];
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unsigned short last, color, count;
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unsigned total = 0;
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count = 0;
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while(read(0, in, 3) == 3) {
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color = to565(in[0],in[1],in[2]);
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if (count) {
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if ((color == last) && (count != 65535)) {
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count++;
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continue;
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} else {
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write(1, &count, 2);
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write(1, &last, 2);
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total += count;
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}
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}
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last = color;
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count = 1;
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}
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if (count) {
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write(1, &count, 2);
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write(1, &last, 2);
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total += count;
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}
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fprintf(stderr,"%d pixels\n",total);
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}
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int main(int argc, char **argv)
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{
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if ((argc == 2) && (!strcmp(argv[1],"-rle"))) {
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to_565_rle();
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} else {
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if (argc > 2 && (!strcmp(argv[1], "-w"))) {
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to_565_raw_dither(atoi(argv[2]));
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} else {
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to_565_raw();
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}
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}
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return 0;
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}
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