1 files changed, 84 insertions, 0 deletions
diff --git a/graphics/arrow.c b/graphics/arrow.c
new file mode 100644
index 0000000..7389400
--- /dev/null
+++ b/graphics/arrow.c
@@ -0,0 +1,84 @@
+/* arrow.c
+ * (c) 2001 Karel 'Clock' Kulhavy
+ * This program is a part of Links project.
+ * It takes a 32x? png image (truecolor one) and puts stdout a hex representation.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <png.h>
+
+double r[256],g[256],b[256];
+unsigned char rc[256],gc[256],bc[256];
+double red_thr=130, green_thr=78, blue_thr=33;
+double red_gamma=2000,green_gamma=2000,blue_gamma=2000;
+
+void print_row_hex(FILE *f, unsigned char *buf, int n)
+{
+	int val1=0, val0=0, a;
+	
+	for (a=0;a<n;a++){
+		val1<<=1;
+		if (*buf==255&&buf[1]==255&&buf[2]==255)val1|=1;
+		val0<<=1;
+		if (!*buf&&!buf[1]&&!buf[2])val0|=1;
+		buf+=3;
+	}
+	fprintf(f,"\t0x%08x,0x%08x,\n", val0, val1);
+}
+
+int main(int argc, char **argv)
+{
+	int x,y;
+	unsigned char* image;
+	png_structp png_ptr_read;
+	png_infop info_ptr_read;
+	FILE *in_file, *out_file;
+	double gamma;
+	
+
+	in_file=fopen("arrow.png","r");
+	out_file=fopen("arrow.inc","w");
+	if (!(in_file&&out_file)){
+		perror("arrow");
+		exit(1);
+	}
+        png_ptr_read=png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL,
+        NULL);
+        info_ptr_read=png_create_info_struct(png_ptr_read);
+        png_init_io(png_ptr_read, in_file);
+        png_read_info(png_ptr_read, info_ptr_read);
+        x=png_get_image_width(png_ptr_read,info_ptr_read);
+        y=png_get_image_height(png_ptr_read,info_ptr_read);
+        if (png_get_gAMA(png_ptr_read,info_ptr_read, &gamma))
+        {
+                png_set_gamma(png_ptr_read, 1, gamma);
+        }
+        else
+        {
+                png_set_gamma(png_ptr_read, 1, 1.0);
+        }
+	png_read_update_info(png_ptr_read, info_ptr_read);
+	image=malloc(3*x);
+	if (!image){
+		fprintf(stderr,"Not enough memory\n");
+		exit(1);
+	}
+
+	fprintf(out_file,"/* Automatically generated by the program \"arrow\" (arrow.c) */");
+	fprintf(out_file,"enum {arrow_width=32, arrow_height=%d, arrow_area=%d};\n",y,y*32);
+	fprintf(out_file,"\nstatic unsigned int arrow[%d]={\n",y+y);
+	for (;y;y--){
+		png_read_row(png_ptr_read,image,NULL);
+		print_row_hex(out_file,image,x);
+	}
+	fprintf(out_file,"};\n");
+	
+	free(image);
+	png_read_end(png_ptr_read, NULL);
+	png_destroy_read_struct(&png_ptr_read, &info_ptr_read, NULL);
+	fclose(in_file);
+	  
+	return 0;
+}
+