1 files changed, 95 insertions, 0 deletions
diff --git a/image/encoders/ico/nsICOEncoder.h b/image/encoders/ico/nsICOEncoder.h
new file mode 100644
index 0000000000..ef601ba97e
--- /dev/null
+++ b/image/encoders/ico/nsICOEncoder.h
@@ -0,0 +1,95 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_encoders_ico_nsICOEncoder_h
+#define mozilla_image_encoders_ico_nsICOEncoder_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ReentrantMonitor.h"
+#include "mozilla/image/ICOFileHeaders.h"
+
+#include "imgIEncoder.h"
+
+#include "nsCOMPtr.h"
+
+#define NS_ICOENCODER_CID                            \
+  { /*92AE3AB2-8968-41B1-8709-B6123BCEAF21 */        \
+    0x92ae3ab2, 0x8968, 0x41b1, {                    \
+      0x87, 0x09, 0xb6, 0x12, 0x3b, 0Xce, 0xaf, 0x21 \
+    }                                                \
+  }
+
+// Provides ICO encoding functionality. Use InitFromData() to do the
+// encoding. See that function definition for encoding options.
+
+class nsICOEncoder final : public imgIEncoder {
+  typedef mozilla::ReentrantMonitor ReentrantMonitor;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_IMGIENCODER
+  NS_DECL_NSIINPUTSTREAM
+  NS_DECL_NSIASYNCINPUTSTREAM
+
+  nsICOEncoder();
+
+  // Obtains the width of the icon directory entry
+  uint32_t GetRealWidth() const {
+    return mICODirEntry.mWidth == 0 ? 256 : mICODirEntry.mWidth;
+  }
+
+  // Obtains the height of the icon directory entry
+  uint32_t GetRealHeight() const {
+    return mICODirEntry.mHeight == 0 ? 256 : mICODirEntry.mHeight;
+  }
+
+ protected:
+  ~nsICOEncoder();
+
+  nsresult ParseOptions(const nsAString& aOptions, uint16_t& aBppOut,
+                        bool& aUsePNGOut);
+  void NotifyListener();
+
+  // Initializes the icon file header mICOFileHeader
+  void InitFileHeader();
+  // Initializes the icon directory info header mICODirEntry
+  void InitInfoHeader(uint16_t aBPP, uint8_t aWidth, uint8_t aHeight);
+  // Encodes the icon file header mICOFileHeader
+  void EncodeFileHeader();
+  // Encodes the icon directory info header mICODirEntry
+  void EncodeInfoHeader();
+  // Obtains the current offset filled up to for the image buffer
+  inline int32_t GetCurrentImageBufferOffset() {
+    return static_cast<int32_t>(mImageBufferCurr - mImageBufferStart);
+  }
+
+  // Holds either a PNG or a BMP depending on the encoding options specified
+  // or if no encoding options specified will use the default (PNG)
+  nsCOMPtr<imgIEncoder> mContainedEncoder;
+
+  // These headers will always contain endian independent stuff.
+  // Don't trust the width and height of mICODirEntry directly,
+  // instead use the accessors GetRealWidth() and GetRealHeight().
+  mozilla::image::IconFileHeader mICOFileHeader;
+  mozilla::image::IconDirEntry mICODirEntry;
+
+  // Keeps track of the start of the image buffer
+  uint8_t* mImageBufferStart;
+  // Keeps track of the current position in the image buffer
+  uint8_t* mImageBufferCurr;
+  // Keeps track of the image buffer size
+  uint32_t mImageBufferSize;
+  // Keeps track of the number of bytes in the image buffer which are read
+  uint32_t mImageBufferReadPoint;
+  // Stores true if the image is done being encoded
+  bool mFinished;
+  // Stores true if the contained image is a PNG
+  bool mUsePNG;
+
+  nsCOMPtr<nsIInputStreamCallback> mCallback;
+  nsCOMPtr<nsIEventTarget> mCallbackTarget;
+  uint32_t mNotifyThreshold;
+};
+
+#endif  // mozilla_image_encoders_ico_nsICOEncoder_h