2 files changed, 20 insertions, 0 deletions
diff --git a/o3d/core/cross/bitmap.h b/o3d/core/cross/bitmap.h
index 96e9b7b..8af80a5 100644
--- a/o3d/core/cross/bitmap.h
+++ b/o3d/core/cross/bitmap.h
@@ -239,6 +239,8 @@ class Bitmap : public ParamObject {
   // Generates Mips from the source_level for num_levels
   void GenerateMips(int source_level, int num_levels);
 
+  bool WriteToPNGStream(std::vector<uint8>* stream);
+
  private:
   friend class IClassManager;
   static ObjectBase::Ref Create(ServiceLocator* service_locator);
diff --git a/o3d/core/cross/bitmap_png.cc b/o3d/core/cross/bitmap_png.cc
index 6b73b94..686e854 100644
--- a/o3d/core/cross/bitmap_png.cc
+++ b/o3d/core/cross/bitmap_png.cc
@@ -316,6 +316,24 @@ bool CreatePNGInUInt8Vector(const Bitmap& bitmap, std::vector<uint8>* buffer) {
 
 }  // anonymous namespace
 
+bool Bitmap::WriteToPNGStream(std::vector<uint8>* stream) {
+  if (format_ != Texture::ARGB8) {
+    O3D_ERROR(service_locator()) << "Can only write ARGB8 images to PNGs.";
+    return false;
+  }
+  if (num_mipmaps_ != 1) {
+    O3D_ERROR(service_locator()) <<
+        "Can only write 2d images with no mips to PNGs.";
+    return false;
+  }
+
+  if (!CreatePNGInUInt8Vector(*this, stream)) {
+    return false;
+  }
+
+  return true;
+}
+
 String Bitmap::ToDataURL() {
   if (format_ != Texture::ARGB8) {
     O3D_ERROR(service_locator()) << "Can only get data URL from ARGB8 images.";