1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/encoders/bmp/nsBMPEncoder.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,91 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include "mozilla/Attributes.h"
1.9 +#include "mozilla/ReentrantMonitor.h"
1.10 +
1.11 +#include "imgIEncoder.h"
1.12 +#include "BMPFileHeaders.h"
1.13 +
1.14 +#include "nsCOMPtr.h"
1.15 +
1.16 +#define NS_BMPENCODER_CID \
1.17 +{ /* 13a5320c-4c91-4FA4-bd16-b081a3ba8c0b */ \
1.18 + 0x13a5320c, \
1.19 + 0x4c91, \
1.20 + 0x4fa4, \
1.21 + {0xbd, 0x16, 0xb0, 0x81, 0xa3, 0Xba, 0x8c, 0x0b} \
1.22 +}
1.23 +
1.24 +// Provides BMP encoding functionality. Use InitFromData() to do the
1.25 +// encoding. See that function definition for encoding options.
1.26 +
1.27 +class nsBMPEncoder MOZ_FINAL : public imgIEncoder
1.28 +{
1.29 + typedef mozilla::ReentrantMonitor ReentrantMonitor;
1.30 +public:
1.31 + NS_DECL_THREADSAFE_ISUPPORTS
1.32 + NS_DECL_IMGIENCODER
1.33 + NS_DECL_NSIINPUTSTREAM
1.34 + NS_DECL_NSIASYNCINPUTSTREAM
1.35 +
1.36 + nsBMPEncoder();
1.37 + ~nsBMPEncoder();
1.38 +
1.39 +protected:
1.40 + enum Version {
1.41 + VERSION_3 = 3,
1.42 + VERSION_5 = 5
1.43 + };
1.44 +
1.45 + // See InitData in the cpp for valid parse options
1.46 + nsresult ParseOptions(const nsAString& aOptions, Version* version,
1.47 + uint32_t* bpp);
1.48 + // Obtains data with no alpha in machine-independent byte order
1.49 + void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
1.50 + uint32_t aPixelWidth);
1.51 + // Thread safe notify listener
1.52 + void NotifyListener();
1.53 +
1.54 + // Initializes the bitmap file header member mBMPFileHeader
1.55 + void InitFileHeader(Version aVersion, uint32_t aBPP, uint32_t aWidth,
1.56 + uint32_t aHeight);
1.57 + // Initializes the bitmap info header member mBMPInfoHeader
1.58 + void InitInfoHeader(Version aVersion, uint32_t aBPP, uint32_t aWidth,
1.59 + uint32_t aHeight);
1.60 +
1.61 + // Encodes the bitmap file header member mBMPFileHeader
1.62 + void EncodeFileHeader();
1.63 + // Encodes the bitmap info header member mBMPInfoHeader
1.64 + void EncodeInfoHeader();
1.65 + // Encodes a row of image data which does not have alpha data
1.66 + void EncodeImageDataRow24(const uint8_t* aData);
1.67 + // Encodes a row of image data which does have alpha data
1.68 + void EncodeImageDataRow32(const uint8_t* aData);
1.69 + // Obtains the current offset filled up to for the image buffer
1.70 + inline int32_t GetCurrentImageBufferOffset()
1.71 + {
1.72 + return static_cast<int32_t>(mImageBufferCurr - mImageBufferStart);
1.73 + }
1.74 +
1.75 + // These headers will always contain endian independent stuff
1.76 + // They store the BMP headers which will be encoded
1.77 + mozilla::image::BMPFILEHEADER mBMPFileHeader;
1.78 + mozilla::image::BITMAPV5HEADER mBMPInfoHeader;
1.79 +
1.80 + // Keeps track of the start of the image buffer
1.81 + uint8_t* mImageBufferStart;
1.82 + // Keeps track of the current position in the image buffer
1.83 + uint8_t* mImageBufferCurr;
1.84 + // Keeps track of the image buffer size
1.85 + uint32_t mImageBufferSize;
1.86 + // Keeps track of the number of bytes in the image buffer which are read
1.87 + uint32_t mImageBufferReadPoint;
1.88 + // Stores true if the image is done being encoded
1.89 + bool mFinished;
1.90 +
1.91 + nsCOMPtr<nsIInputStreamCallback> mCallback;
1.92 + nsCOMPtr<nsIEventTarget> mCallbackTarget;
1.93 + uint32_t mNotifyThreshold;
1.94 +};
