This adds a crop tool to farbfeld, the use is: ffcrop x y w h.
What do you think?
From fc0479232da65ca60119b6131a11e6aca4273d11 Mon Sep 17 00:00:00 2001 From: rain1 <[email protected]> Date: Fri, 8 Apr 2016 13:08:47 +0000 Subject: [PATCH] Added crop tool. --- Makefile | 2 +- ffcrop.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 108 insertions(+), 1 deletion(-) create mode 100644 ffcrop.c diff --git a/Makefile b/Makefile index 21b82d9..bf5b40f 100644 --- a/Makefile +++ b/Makefile @@ -2,7 +2,7 @@ # See LICENSE file for copyright and license details include config.mk -BIN = png2ff ff2png jpg2ff ff2jpg ff2ppm +BIN = png2ff ff2png jpg2ff ff2jpg ff2ppm ffcrop SCRIPTS = 2ff SRC = ${BIN:=.c} HDR = arg.h diff --git a/ffcrop.c b/ffcrop.c new file mode 100644 index 0000000..03e162c --- /dev/null +++ b/ffcrop.c @@ -0,0 +1,107 @@ +/* See LICENSE file for copyright and license details. */ +#include <arpa/inet.h> + +#include <errno.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <png.h> + +static char *argv0; + +int +main(int argc, char *argv[]) +{ + size_t rowlen; + uint32_t hdr[4], width, height, i, tmp32; + uint16_t *row; + uint32_t crop_x, crop_y, crop_w, crop_h; + size_t crop_skiplen, crop_rowlen; + + argv0 = argv[0], argc--, argv++; + + if (argc != 4) { + fprintf(stderr, "usage: %s x y w h\n", argv0); + return 1; + } + + crop_x = strtol(argv[0], NULL, 10); + crop_y = strtol(argv[1], NULL, 10); + crop_w = strtol(argv[2], NULL, 10); + crop_h = strtol(argv[3], NULL, 10); + + /* header */ + if (fread(hdr, sizeof(*hdr), 4, stdin) != 4) { + goto readerr; + } + if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) { + fprintf(stderr, "%s: invalid magic value\n", argv0); + return 1; + } + width = ntohl(hdr[2]); + height = ntohl(hdr[3]); + + /* sanitize the input sizes */ + if (crop_x > width) { + crop_x = width; + } + if (crop_y > height) { + crop_y = height; + } + if (crop_w > width - crop_x) { + crop_w = width - crop_x; + } + if (crop_h > height - crop_y) { + crop_h = height - crop_y; + } + + /* write header */ + fputs("farbfeld", stdout); + tmp32 = htonl(crop_w); + if (fwrite(&tmp32, sizeof(uint32_t), 1, stdout) != 1) + goto writerr; + tmp32 = htonl(crop_h); + if (fwrite(&tmp32, sizeof(uint32_t), 1, stdout) != 1) + goto writerr; + + if (width > SIZE_MAX / ((sizeof("RGBA") - 1) * sizeof(uint16_t))) { + fprintf(stderr, "%s: row length integer overflow\n", argv0); + return 1; + } + rowlen = width * (sizeof("RGBA") - 1); + if (!(row = malloc(rowlen * sizeof(uint16_t)))) { + fprintf(stderr, "%s: malloc: out of memory\n", argv0); + return 1; + } + crop_skiplen = crop_x * (sizeof("RGBA") - 1); + crop_rowlen = crop_w * (sizeof("RGBA") - 1); + + /* skip the first rows */ + for (i = 0; i < crop_y; ++i) { + if (fread(row, sizeof(uint16_t), rowlen, stdin) != rowlen) { + goto readerr; + } + } + /* write rows */ + for (i = 0; i < crop_h; ++i) { + if (fread(row, sizeof(uint16_t), rowlen, stdin) != rowlen) { + goto readerr; + } + fwrite(row + crop_skiplen, sizeof(uint16_t), crop_rowlen, stdout); + } + + return 0; +readerr: + fprintf(stderr, "%s: fread: ", argv0); + perror(NULL); + + return 1; + +writerr: + fprintf(stderr, "%s: fwrite: ", argv0); + perror(NULL); + + return 1; +} -- 2.8.1
