# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1500960179 -10800
# Node ID aea67378e657ced4d4374c59016d427697f11d9a
# Parent  f5422c7609c1f4b6626f15bb8c64fc1e197f9ce1
crop

diff -r f5422c7609c1 -r aea67378e657 src/main.c
--- a/src/main.c	Tue Jul 25 06:29:33 2017 +0300
+++ b/src/main.c	Tue Jul 25 08:22:59 2017 +0300
@@ -22,6 +22,9 @@
 static int pcol_bits = 8;
 static int verbose = 0;
 
+static int crop_x, crop_y;
+static int crop_width, crop_height;
+
 int main(int argc, char **argv)
 {
 	int i;
@@ -54,6 +57,10 @@
 					verbose = 1;
 					break;
 
+				case 'c':
+					sscanf(argv[++i], "%dx%d+%d+%d", &crop_width, &crop_height, &crop_x, &crop_y);
+					break;
+
 				case 'h':
 					printf("usage: %s [options] <file 1> <file 2> ... <file n>\n", argv[0]);
 					printf("Options:\n");
@@ -62,6 +69,7 @@
 					printf(" -i: output image in interleaved mode\n");
 					printf(" -8: output palette with 8bit per color channel\n");
 					printf(" -4: output palette with 4bit per color channel\n");
+					printf(" -c WxH+X+Y: crop image\n");
 					printf(" -v: verbose output\n");
 					printf(" -h: print usage and exit\n");
 					return 0;
@@ -84,7 +92,7 @@
 
 static int proc_image(const char *fname)
 {
-	int i;
+	int i, cropping = 0;
 	struct image img;
 	char *outfname, *suffix;
 	FILE *fp;
@@ -94,6 +102,13 @@
 		return -1;
 	}
 
+	if(crop_width <= 0) {
+		crop_width = img.width - crop_x;
+		crop_height = img.height - crop_y;
+	} else {
+		cropping = 1;
+	}
+
 	if(!(outfname = malloc(strlen(fname) + 4))) {
 		perror("failed to allocate output filename");
 		return -1;
@@ -125,6 +140,9 @@
 						img.range[i].rate, modestr(img.range[i].cmode));
 			}
 		}
+		if(cropping) {
+			printf("  crop: %dx%d+%d+%d\n", crop_width, crop_height, crop_x, crop_y);
+		}
 	}
 
 	switch(mode) {
@@ -179,11 +197,11 @@
 	int i, x, y;
 	unsigned char acc = 0;
 	int acc_bit = 7;
-	unsigned char *pptr = img->pixels;
+	unsigned char *pptr = img->pixels + crop_y * img->width + crop_x;
 
 	for(i=0; i<img->bpp; i++) {
-		for(y=0; y<img->height; y++) {
-			for(x=0; x<img->width; x++) {
+		for(y=0; y<crop_height; y++) {
+			for(x=0; x<crop_width; x++) {
 				int bit = img->bpp - i - 1;
 				acc |= ((pptr[i] >> bit) & 1) << acc_bit;
 				if(acc_bit-- == 0) {
@@ -193,6 +211,7 @@
 					pptr += img->bpp;
 				}
 			}
+			pptr += img->width - crop_width;
 		}
 	}
 }
@@ -202,11 +221,11 @@
 	int i, x, y;
 	unsigned char acc = 0;
 	int acc_bit = 7;
-	unsigned char *pptr = img->pixels;
+	unsigned char *pptr = img->pixels + crop_y * img->width + crop_x;
 
-	for(y=0; y<img->height; y++) {
+	for(y=0; y<crop_height; y++) {
 		for(i=0; i<img->bpp; i++) {
-			for(x=0; x<img->width; x++) {
+			for(x=0; x<crop_width; x++) {
 				int bit = img->bpp - i - 1;
 				acc |= ((pptr[i] >> bit) & 1) << acc_bit;
 				if(acc_bit-- == 0) {
@@ -216,6 +235,7 @@
 					pptr += img->bpp;
 				}
 			}
+			pptr += img->width - crop_width;
 		}
 	}
 }
@@ -225,10 +245,11 @@
 	int i, j;
 	unsigned char *pptr = img->pixels;
 
-	for(i=0; i<img->height; i++) {
-		for(j=0; j<img->width; j++) {
+	for(i=0; i<crop_height; i++) {
+		for(j=0; j<crop_width; j++) {
 			fputc(*pptr++, fp);
 		}
+		pptr += img->width - crop_width;
 	}
 }