mirror of
https://github.com/rn10950/RetroZilla.git
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276 lines
9.0 KiB
C++
276 lines
9.0 KiB
C++
/* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=4: */
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/* ***** 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 the Mozilla BMP Decoder.
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*
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* The Initial Developer of the Original Code is
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* Christian Biesinger <cbiesinger@web.de>.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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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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#ifndef _nsBMPDecoder_h
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#define _nsBMPDecoder_h
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#include "nsCOMPtr.h"
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#include "imgIDecoder.h"
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#include "imgIContainer.h"
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#include "imgIDecoderObserver.h"
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#include "gfxIImageFrame.h"
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#define NS_BMPDECODER_CID \
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{ /* {78c61626-4d1f-4843-9364-4652d98ff6e1} */ \
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0x78c61626, \
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0x4d1f, \
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0x4843, \
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{ 0x93, 0x64, 0x46, 0x52, 0xd9, 0x8f, 0xf6, 0xe1 } \
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}
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struct BMPFILEHEADER {
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char signature[2]; // String "BM"
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PRUint32 filesize;
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PRInt32 reserved; // Zero
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PRUint32 dataoffset; // Offset to raster data
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PRUint32 bihsize;
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};
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#define BFH_LENGTH 18 // Note: For our purposes, we include bihsize in the BFH
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#define OS2_BIH_LENGTH 12 // This is the real BIH size (as contained in the bihsize field of BMPFILEHEADER)
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#define OS2_HEADER_LENGTH (BFH_LENGTH + 8)
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#define WIN_HEADER_LENGTH (BFH_LENGTH + 36)
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struct BMPINFOHEADER {
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PRInt32 width; // Uint16 in OS/2 BMPs
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PRInt32 height; // Uint16 in OS/2 BMPs
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PRUint16 planes; // =1
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PRUint16 bpp; // Bits per pixel.
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// The rest of the header is not available in OS/2 BMP Files
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PRUint32 compression; // 0=no compression 1=8bit RLE 2=4bit RLE
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PRUint32 image_size; // (compressed) image size. Can be 0 if compression==0
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PRUint32 xppm; // Pixels per meter, horizontal
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PRUint32 yppm; // Pixels per meter, vertical
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PRUint32 colors; // Used Colors
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PRUint32 important_colors; // Number of important colors. 0=all
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};
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struct colorTable {
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PRUint8 red;
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PRUint8 green;
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PRUint8 blue;
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};
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struct bitFields {
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PRUint32 red;
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PRUint32 green;
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PRUint32 blue;
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PRUint8 redLeftShift;
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PRUint8 redRightShift;
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PRUint8 greenLeftShift;
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PRUint8 greenRightShift;
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PRUint8 blueLeftShift;
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PRUint8 blueRightShift;
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};
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#define BITFIELD_LENGTH 12 // Length of the bitfields structure in the bmp file
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#if defined WORDS_BIGENDIAN || defined IS_BIG_ENDIAN
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// We must ensure that the entity is unsigned
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// otherwise, if it is signed/negative, the MSB will be
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// propagated when we shift
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#define LITTLE_TO_NATIVE16(x) (((((PRUint16) x) & 0xFF) << 8) | \
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(((PRUint16) x) >> 8))
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#define LITTLE_TO_NATIVE32(x) (((((PRUint32) x) & 0xFF) << 24) | \
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(((((PRUint32) x) >> 8) & 0xFF) << 16) | \
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(((((PRUint32) x) >> 16) & 0xFF) << 8) | \
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(((PRUint32) x) >> 24))
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#else
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#define LITTLE_TO_NATIVE16(x) x
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#define LITTLE_TO_NATIVE32(x) x
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#endif
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#if defined(XP_WIN) || defined(XP_OS2) || defined(XP_BEOS) || defined(MOZ_WIDGET_PHOTON)
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#define BMP_GFXFORMAT gfxIFormats::BGR
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#define RLE_GFXFORMAT_ALPHA gfxIFormats::BGR_A1
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#else
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#define USE_RGB
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#define BMP_GFXFORMAT gfxIFormats::RGB
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#define RLE_GFXFORMAT_ALPHA gfxIFormats::RGB_A1
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#endif
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#if defined(XP_MAC) || defined(XP_MACOSX)
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#define GFXBYTESPERPIXEL 4
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#else
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#define GFXBYTESPERPIXEL 3
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#endif
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// BMPINFOHEADER.compression defines
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#define BI_RLE8 1
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#define BI_RLE4 2
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#define BI_BITFIELDS 3
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// RLE Escape codes
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#define RLE_ESCAPE 0
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#define RLE_ESCAPE_EOL 0
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#define RLE_ESCAPE_EOF 1
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#define RLE_ESCAPE_DELTA 2
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/// enums for mState
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enum ERLEState {
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eRLEStateInitial,
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eRLEStateNeedSecondEscapeByte,
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eRLEStateNeedXDelta,
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eRLEStateNeedYDelta, ///< mStateData will hold x delta
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eRLEStateAbsoluteMode, ///< mStateData will hold count of existing data to read
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eRLEStateAbsoluteModePadded ///< As above, but another byte of data has to be read as padding
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};
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/**
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* Decoder for BMP-Files, as used by Windows and OS/2
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*/
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class nsBMPDecoder : public imgIDecoder
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_IMGIDECODER
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nsBMPDecoder();
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~nsBMPDecoder();
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private:
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/** Callback for ReadSegments to avoid copying the data */
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static NS_METHOD ReadSegCb(nsIInputStream* aIn, void* aClosure,
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const char* aFromRawSegment, PRUint32 aToOffset,
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PRUint32 aCount, PRUint32 *aWriteCount);
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/** Processes the data.
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* @param aBuffer Data to process.
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* @oaram count Number of bytes in mBuffer */
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NS_METHOD ProcessData(const char* aBuffer, PRUint32 aCount);
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/** Calculates the red-, green- and blueshift in mBitFields using
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* the bitmasks from mBitFields */
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NS_METHOD CalcBitShift();
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/** Sets the image data. mCurLine is used to get the row,
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* mDecoded is used to get the data */
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nsresult SetData();
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/** Sets the rle data. mCurLine is used to get the row,
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* mDecoded is used to get the data for the first row,
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* all subsequent rows are blank.
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* @param rows Number of rows of data to set */
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nsresult WriteRLERows(PRUint32 rows);
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nsCOMPtr<imgIDecoderObserver> mObserver;
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nsCOMPtr<imgIContainer> mImage;
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nsCOMPtr<gfxIImageFrame> mFrame;
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PRUint32 mPos;
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BMPFILEHEADER mBFH;
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BMPINFOHEADER mBIH;
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char mRawBuf[36];
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PRUint32 mLOH; ///< Length of the header
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PRUint32 mNumColors; ///< The number of used colors, i.e. the number of entries in mColors
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colorTable *mColors;
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bitFields mBitFields;
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PRUint8 *mRow; ///< Holds one raw line of the image
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PRUint32 mRowBytes; ///< How many bytes of the row were already received
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PRInt32 mCurLine; ///< Index of the line of the image that's currently being decoded
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PRUint8 *mAlpha; ///< Holds one line of unpacked alpha data
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PRUint8 *mAlphaPtr; ///< Pointer within unpacked alpha data
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PRUint8 *mDecoded; ///< Holds one line of color image data
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PRUint8 *mDecoding; ///< Pointer within image data
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ERLEState mState; ///< Maintains the current state of the RLE decoding
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PRUint32 mStateData;///< Decoding information that is needed depending on mState
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PRUint32 mBpr; ///< Cached image bytes per row
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/** Set mBFH from the raw data in mRawBuf, converting from little-endian
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* data to native data as necessary */
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void ProcessFileHeader();
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/** Set mBIH from the raw data in mRawBuf, converting from little-endian
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* data to native data as necessary */
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void ProcessInfoHeader();
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};
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/** Sets the pixel data in aDecoded to the given values.
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* The variable passed in as aDecoded will be moved on 3 bytes! */
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inline void SetPixel(PRUint8*& aDecoded, PRUint8 aRed, PRUint8 aGreen, PRUint8 aBlue)
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{
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#if defined(XP_MAC) || defined(XP_MACOSX)
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*aDecoded++ = 0; // Mac needs this padding byte
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#endif
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#ifdef USE_RGB
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*aDecoded++ = aRed;
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*aDecoded++ = aGreen;
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*aDecoded++ = aBlue;
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#else
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*aDecoded++ = aBlue;
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*aDecoded++ = aGreen;
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*aDecoded++ = aRed;
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#endif
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}
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inline void SetPixel(PRUint8*& aDecoded, PRUint8 idx, colorTable* aColors)
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{
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PRUint8 red, green, blue;
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red = aColors[idx].red;
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green = aColors[idx].green;
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blue = aColors[idx].blue;
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SetPixel(aDecoded, red, green, blue);
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}
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/** Sets two (or one if aCount = 1) pixels
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* @param aDecoded where the data is stored. Will be moved 3 or 6 bytes,
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* depending on whether one or two pixels are written.
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* @param aData The values for the two pixels
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* @param aCount Current count. Is decremented by one or two. */
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inline void Set4BitPixel(PRUint8*& aDecoded, PRUint8 aData,
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PRUint32& aCount, colorTable* aColors)
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{
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PRUint8 idx = aData >> 4;
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SetPixel(aDecoded, idx, aColors);
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if (--aCount > 0) {
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idx = aData & 0xF;
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SetPixel(aDecoded, idx, aColors);
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--aCount;
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}
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}
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#endif
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