add support for webp image format2.08

1 files changed, 93 insertions, 0 deletions

diff --git a/rd/read-webp.c b/rd/read-webp.c
new file mode 100644
index 0000000..0dfe372
--- /dev/null
+++ b/rd/read-webp.c
@@ -0,0 +1,93 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <webp/decode.h>
+
+#include "readers.h"
+
+
+struct webp_state {
+	FILE *f;
+	int width, height;
+	uint8_t *data;
+};
+
+static void *
+webp_init(FILE *fp, char *filename, unsigned int page,
+          struct ida_image_info *i, int thumbnail)
+{
+	uint32_t img_size;
+	void *img;
+	struct webp_state *h;
+	h = malloc(sizeof(*h));
+
+	h->f = fp;
+	if(fseek(fp, 0, SEEK_END) != 0)
+	{
+		free(h);
+		return NULL;
+	}
+	img_size = ftell(fp);
+	img = malloc(img_size);
+
+	if(fseek(fp, 0, SEEK_SET) != 0)
+	{
+		free(img);
+		free(h);
+		return NULL;
+	}
+	if(fread(img, img_size, 1, fp) != 1)
+	{
+		free(img);
+		free(h);
+		return NULL;
+	}
+
+	h->data = WebPDecodeRGBA(img, img_size, &h->width, &h->height);
+
+	i->width = h->width;
+	i->height = h->height;
+	i->dpi = 100;
+	i->npages = 1;
+
+	free(img);
+
+	return h;
+}
+
+
+static void
+webp_read(unsigned char *dst, unsigned int line, void *data)
+{
+	struct webp_state *h = data;
+
+	load_rgba(dst, h->data + line * 4 * h->width, h->width);
+}
+
+
+static void
+webp_done(void *data)
+{
+	struct webp_state *h = data;
+
+	free(h->data);
+	fclose(h->f);
+	free(h);
+}
+
+
+static struct ida_loader webp_loader = {
+    magic: "WEBPVP8",
+    moff:  8,
+    mlen:  7,
+    name:  "libwebp",
+    init:  webp_init,
+    read:  webp_read,
+    done:  webp_done,
+};
+
+
+static void __init init_rd(void)
+{
+    load_register(&webp_loader);
+}