1 files changed, 58 insertions, 0 deletions
diff --git a/examples/png2avif.c b/examples/png2avif.c
new file mode 100644
index 0000000..18463e7
--- /dev/null
+++ b/examples/png2avif.c
@@ -0,0 +1,58 @@
+/**
+ * A short program which converts a .png file into a .avif file -
+ * just to get a little practice with the basic functionality.
+ * We convert losslessly.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "gd.h"
+
+int main(int argc, char **argv)
+{
+	gdImagePtr im;
+	FILE *in, *out;
+
+	if (argc != 3) {
+		fprintf(stderr, "Usage: png2avif infile.png outfile.avif\n");
+		exit(1);
+	}
+
+	printf("Reading infile %s\n", argv[1]);
+
+	in = fopen(argv[1], "rb");
+	if (!in) {
+		fprintf(stderr, "Error: input file %s does not exist.\n", argv[1]);
+		exit(1);
+	}
+
+	im = gdImageCreateFromPng(in);
+	fclose(in);
+	if (!im) {
+		fprintf(stderr, "Error: input file %s is not in PNG format.\n", argv[1]);
+		exit(1);
+	}
+
+	out = fopen(argv[2], "wb");
+	if (!out) {
+		fprintf(stderr, "Error: can't write to output file %s\n", argv[2]);
+		gdImageDestroy(im);
+		exit(1);
+	}
+
+	fprintf(stderr, "Encoding...\n");
+
+	gdImageAvifEx(im, out, 100, 0);
+
+	printf("Wrote outfile %s.\n", argv[2]);
+
+	fclose(out);
+	gdImageDestroy(im);
+
+	return 0;
+}