import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

image/encoders/bmp/nsBMPEncoder.h

@@ -0,0 +1,157 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_bmp_nsBMPEncoder_h
+#define mozilla_image_encoders_bmp_nsBMPEncoder_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ReentrantMonitor.h"
+#include "mozilla/UniquePtr.h"
+
+#include "imgIEncoder.h"
+#include "BMPHeaders.h"
+
+#include "nsCOMPtr.h"
+
+#define NS_BMPENCODER_CID \
+{ /* 13a5320c-4c91-4FA4-bd16-b081a3ba8c0b */         \
+     0x13a5320c,                                     \
+     0x4c91,                                         \
+     0x4fa4,                                         \
+    {0xbd, 0x16, 0xb0, 0x81, 0xa3, 0Xba, 0x8c, 0x0b} \
+}
+
+namespace mozilla {
+namespace image {
+namespace bmp {
+
+struct FileHeader {
+  char signature[2];   // String "BM".
+  uint32_t filesize;   // File size.
+  int32_t reserved;    // Zero.
+  uint32_t dataoffset; // Offset to raster data.
+};
+
+struct XYZ {
+  int32_t x, y, z;
+};
+
+struct XYZTriple {
+  XYZ r, g, b;
+};
+
+struct V5InfoHeader {
+  uint32_t bihsize;          // Header size
+  int32_t width;             // Uint16 in OS/2 BMPs
+  int32_t height;            // Uint16 in OS/2 BMPs
+  uint16_t planes;           // =1
+  uint16_t bpp;              // Bits per pixel.
+  uint32_t compression;      // See Compression for valid values
+  uint32_t image_size;       // (compressed) image size. Can be 0 if
+                             // compression==0
+  uint32_t xppm;             // Pixels per meter, horizontal
+  uint32_t yppm;             // Pixels per meter, vertical
+  uint32_t colors;           // Used Colors
+  uint32_t important_colors; // Number of important colors. 0=all
+  // The rest of the header is not available in WIN_V3 BMP Files
+  uint32_t red_mask;         // Bits used for red component
+  uint32_t green_mask;       // Bits used for green component
+  uint32_t blue_mask;        // Bits used for blue component
+  uint32_t alpha_mask;       // Bits used for alpha component
+  uint32_t color_space;      // 0x73524742=LCS_sRGB ...
+  // These members are unused unless color_space == LCS_CALIBRATED_RGB
+  XYZTriple white_point;     // Logical white point
+  uint32_t gamma_red;        // Red gamma component
+  uint32_t gamma_green;      // Green gamma component
+  uint32_t gamma_blue;       // Blue gamma component
+  uint32_t intent;           // Rendering intent
+  // These members are unused unless color_space == LCS_PROFILE_*
+  uint32_t profile_offset;   // Offset to profile data in bytes
+  uint32_t profile_size;     // Size of profile data in bytes
+  uint32_t reserved;         // =0
+
+  static const uint32_t COLOR_SPACE_LCS_SRGB = 0x73524742;
+};
+
+} // namespace bmp
+} // namespace image
+} // namespace mozilla
+
+// Provides BMP encoding functionality. Use InitFromData() to do the
+// encoding. See that function definition for encoding options.
+
+class nsBMPEncoder final : public imgIEncoder
+{
+  typedef mozilla::ReentrantMonitor ReentrantMonitor;
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_IMGIENCODER
+  NS_DECL_NSIINPUTSTREAM
+  NS_DECL_NSIASYNCINPUTSTREAM
+
+  nsBMPEncoder();
+
+protected:
+  ~nsBMPEncoder();
+
+  enum Version
+  {
+      VERSION_3 = 3,
+      VERSION_5 = 5
+  };
+
+  // See InitData in the cpp for valid parse options
+  nsresult ParseOptions(const nsAString& aOptions, Version& aVersionOut,
+                        uint16_t& aBppOut);
+  // Obtains data with no alpha in machine-independent byte order
+  void ConvertHostARGBRow(const uint8_t* aSrc,
+                          const mozilla::UniquePtr<uint8_t[]>& aDest,
+                          uint32_t aPixelWidth);
+  // Thread safe notify listener
+  void NotifyListener();
+
+  // Initializes the bitmap file header member mBMPFileHeader
+  nsresult InitFileHeader(Version aVersion, uint16_t aBPP, uint32_t aWidth,
+                          uint32_t aHeight);
+  // Initializes the bitmap info header member mBMPInfoHeader
+  nsresult InitInfoHeader(Version aVersion, uint16_t aBPP, uint32_t aWidth,
+                          uint32_t aHeight);
+
+  // Encodes the bitmap file header member mBMPFileHeader
+  void EncodeFileHeader();
+  // Encodes the bitmap info header member mBMPInfoHeader
+  void EncodeInfoHeader();
+  // Encodes a row of image data which does not have alpha data
+  void EncodeImageDataRow24(const uint8_t* aData);
+  // Encodes a row of image data which does have alpha data
+  void EncodeImageDataRow32(const uint8_t* aData);
+  // Obtains the current offset filled up to for the image buffer
+  inline int32_t GetCurrentImageBufferOffset()
+  {
+    return static_cast<int32_t>(mImageBufferCurr - mImageBufferStart);
+  }
+
+  // These headers will always contain endian independent stuff
+  // They store the BMP headers which will be encoded
+  mozilla::image::bmp::FileHeader mBMPFileHeader;
+  mozilla::image::bmp::V5InfoHeader mBMPInfoHeader;
+
+  // 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;
+
+  nsCOMPtr<nsIInputStreamCallback> mCallback;
+  nsCOMPtr<nsIEventTarget> mCallbackTarget;
+  uint32_t mNotifyThreshold;
+};
+
+#endif // mozilla_image_encoders_bmp_nsBMPEncoder_h