зеркало из https://github.com/mozilla/pjs.git
118 строки
4.6 KiB
C++
118 строки
4.6 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is an implementation of a bitmap encoder.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brian R. Bondy <netzen@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "imgIEncoder.h"
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#include "BMPFileHeaders.h"
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#include "mozilla/ReentrantMonitor.h"
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#include "nsCOMPtr.h"
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#define NS_BMPENCODER_CID \
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{ /* 13a5320c-4c91-4FA4-bd16-b081a3ba8c0b */ \
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0x13a5320c, \
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0x4c91, \
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0x4fa4, \
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{0xbd, 0x16, 0xb0, 0x81, 0xa3, 0Xba, 0x8c, 0x0b} \
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}
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// Provides BMP encoding functionality. Use InitFromData() to do the
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// encoding. See that function definition for encoding options.
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class nsBMPEncoder : public imgIEncoder
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{
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typedef mozilla::ReentrantMonitor ReentrantMonitor;
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_IMGIENCODER
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIASYNCINPUTSTREAM
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nsBMPEncoder();
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~nsBMPEncoder();
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protected:
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// See InitData in the cpp for valid parse options
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nsresult ParseOptions(const nsAString& aOptions, PRUint32* bpp);
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// Obtains data with no alpha in machine-independent byte order
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void ConvertHostARGBRow(const PRUint8* aSrc, PRUint8* aDest,
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PRUint32 aPixelWidth);
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// Strips the alpha from aSrc and puts it in aDest
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void StripAlpha(const PRUint8* aSrc, PRUint8* aDest,
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PRUint32 aPixelWidth);
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// Thread safe notify listener
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void NotifyListener();
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// Initializes the bitmap file header member mBMPFileHeader
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void InitFileHeader(PRUint32 aBPP, PRUint32 aWidth, PRUint32 aHeight);
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// Initializes the bitmap info header member mBMPInfoHeader
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void InitInfoHeader(PRUint32 aBPP, PRUint32 aWidth, PRUint32 aHeight);
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// Encodes the bitmap file header member mBMPFileHeader
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void EncodeFileHeader();
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// Encodes the bitmap info header member mBMPInfoHeader
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void EncodeInfoHeader();
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// Encodes a row of image data which does not have alpha data
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void EncodeImageDataRow24(const PRUint8* aData);
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// Encodes a row of image data which does have alpha data
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void EncodeImageDataRow32(const PRUint8* aData);
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// Obtains the current offset filled up to for the image buffer
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inline PRInt32 GetCurrentImageBufferOffset()
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{
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return static_cast<PRInt32>(mImageBufferCurr - mImageBufferStart);
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}
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// These headers will always contain endian independent stuff
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// They store the BMP headers which will be encoded
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mozilla::imagelib::BMPFILEHEADER mBMPFileHeader;
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mozilla::imagelib::BMPINFOHEADER mBMPInfoHeader;
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// Keeps track of the start of the image buffer
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PRUint8* mImageBufferStart;
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// Keeps track of the current position in the image buffer
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PRUint8* mImageBufferCurr;
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// Keeps track of the image buffer size
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PRUint32 mImageBufferSize;
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// Keeps track of the number of bytes in the image buffer which are read
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PRUint32 mImageBufferReadPoint;
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// Stores true if the image is done being encoded
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bool mFinished;
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nsCOMPtr<nsIInputStreamCallback> mCallback;
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nsCOMPtr<nsIEventTarget> mCallbackTarget;
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PRUint32 mNotifyThreshold;
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};
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