Add WebP2 support

codecs/wp2/dec/wp2_dec.cpp

@@ -0,0 +1,40 @@
+#include <cstdio>
+#include <emscripten/bind.h>
+#include <emscripten/val.h>
+
+#include "src/wp2/decode.h"
+using namespace emscripten;
+
+class RawImage {
+public:
+  val buffer;
+  int width;
+  int height;
+
+  RawImage(val b, int w, int h) : buffer(b), width(w), height(h) {}
+};
+
+WP2::ArgbBuffer *buffer = new WP2::ArgbBuffer(WP2_rgbA_32);
+
+RawImage decode(std::string image_in) {
+  WP2Status status;
+  status = WP2::Decode(image_in, buffer);
+  if (status != WP2_STATUS_OK) {
+    return RawImage(val::null(), -1, -1);
+  }
+  return RawImage(val(typed_memory_view(buffer->width * buffer->height * 4,
+                                        (uint8_t *)buffer->GetRow(0))),
+                  buffer->width, buffer->height);
+}
+
+void free_result() { delete buffer; }
+
+EMSCRIPTEN_BINDINGS(my_module) {
+  class_<RawImage>("RawImage")
+      .property("buffer", &RawImage::buffer)
+      .property("width", &RawImage::width)
+      .property("height", &RawImage::height);
+
+  function("decode", &decode);
+  function("free_result", &free_result);
+}