hard edges

blurrerbox.c

@@ -231,8 +231,8 @@ void write_jpg(FILE *out, unsigned char *image, int width, int height) {
 	jpeg_create_compress(&cinfo);
 	jpeg_stdio_dest(&cinfo, out);
 
-	cinfo.image_width = width;
-	cinfo.image_height = height;
+	cinfo.image_width = width - blur_radius * 2;
+	cinfo.image_height = height - blur_radius * 2;
 	cinfo.input_components = 3;
 	cinfo.in_color_space = JCS_RGB;
 
@@ -244,7 +244,7 @@ void write_jpg(FILE *out, unsigned char *image, int width, int height) {
 	JSAMPROW row_pointer[1];
 
 	while (cinfo.next_scanline < cinfo.image_height) {
-		row_pointer[0] = &image[cinfo.next_scanline * bytes_per_line];
+		row_pointer[0] = &image[(cinfo.next_scanline + blur_radius) * bytes_per_line + blur_radius * 3];
 		jpeg_write_scanlines(&cinfo, row_pointer, 1);
 	}
 
@@ -263,6 +263,8 @@ int main(int argc, char **argv) {
 		fprintf(stderr, "Error parsing resolution '%s'\n", argv[1]);
 		return EXIT_FAILURE;
 	}
+	desired_width += blur_radius * 2;
+	desired_height += blur_radius * 2;
 
 	FILE *in;
 	if (strcmp(argv[2], "-") == 0) {