Add missing PngOptions (related to a532f21ec4, #2153)

src/app/file/png_options.h

@@ -0,0 +1,48 @@
+// Aseprite
+// Copyright (C) 2019  Igara Studio S.A.
+//
+// This program is distributed under the terms of
+// the End-User License Agreement for Aseprite.
+
+#ifndef APP_FILE_PNG_OPTIONS_H_INCLUDED
+#define APP_FILE_PNG_OPTIONS_H_INCLUDED
+#pragma once
+
+#include "app/file/format_options.h"
+#include "base/buffer.h"
+
+namespace app {
+
+  // Data for PNG files
+  class PngOptions : public FormatOptions {
+  public:
+    struct Chunk {
+      std::string name;
+      base::buffer data;
+      // Flags PNG_HAVE_IHDR/PNG_HAVE_PLTE/PNG_AFTER_IDAT
+      int location;
+    };
+
+    using Chunks = std::vector<Chunk>;
+
+    void addChunk(Chunk&& chunk) {
+      m_userChunks.emplace_back(std::move(chunk));
+    }
+
+    bool isEmpty() const {
+      return m_userChunks.empty();
+    }
+
+    int size() const {
+      return int(m_userChunks.size());
+    }
+
+    const Chunks& chunks() const { return m_userChunks; }
+
+  private:
+    Chunks m_userChunks;
+  };
+
+} // namespace app
+
+#endif