116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <cammy/image.h>
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#include <cammy/photo.h>
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#include "commands.h"
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static cammy_image_color palette[4] = {
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{ 0, 0, 0, 255 },
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{ 85, 85, 85, 255 },
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{ 171, 171, 171, 255 },
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{ 255, 255, 255, 255 }
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};
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static void usage(int argc, char **argv, const char *message, ...) {
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if (message) {
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va_list args;
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va_start(args, message);
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vfprintf(stderr, message, args);
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va_end(args);
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fprintf(stderr, "\n");
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}
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fprintf(stderr, "usage: %1$s dither input.png output.png\n", argv[0]);
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exit(1);
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}
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static cammy_image *image_dither(cammy_image *image) {
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cammy_image *image_tile,
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*dest;
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cammy_image_region from = {
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0, 0, image->width, image->height
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};
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cammy_image_point to = {
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0, 0
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};
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if ((image_tile = cammy_image_new(CAMMY_IMAGE_TILE,
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CAMMY_IMAGE_2BPP,
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palette,
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image->width,
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image->height)) == NULL) {
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goto error_image_new_2bpp;
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}
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cammy_image_copy(image_tile, image, &to, &from);
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if ((dest = cammy_image_new(CAMMY_IMAGE_BITMAP,
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CAMMY_IMAGE_24BPP_RGB,
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palette,
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image->width,
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image->height)) == NULL) {
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goto error_image_new_dest;
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}
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cammy_image_copy(dest, image_tile, &to, &from);
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cammy_image_destroy(image_tile);
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return dest;
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error_image_new_dest:
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cammy_image_destroy(image_tile);
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error_image_new_2bpp:
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return NULL;
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}
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int cammy_dither(int argc, char **argv) {
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cammy_image *image_in,
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*image_out;
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if (argc < 3) {
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usage(argc, argv, "No PNG input file provided");
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} else if (argc < 4) {
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usage(argc, argv, "No PNG output filename provided");
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}
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if ((image_in = cammy_image_open(argv[2])) == NULL) {
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goto error_image_open;
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}
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if ((image_out = image_dither(image_in)) == NULL) {
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goto error_image_dither;
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}
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if (cammy_image_save(image_out, argv[3]) < 0) {
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goto error_image_save;
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}
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cammy_image_destroy(image_out);
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cammy_image_destroy(image_in);
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return 0;
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error_image_save:
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cammy_image_destroy(image_out);
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error_image_dither:
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cammy_image_destroy(image_in);
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error_image_open:
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return 1;
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}
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