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/* -*- 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 "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
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