зеркало из https://github.com/mozilla/gecko-dev.git
134 строки
5.1 KiB
C++
134 строки
5.1 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 ICO Decoder.
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*
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* The Initial Developer of the Original Code is
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* Netscape.
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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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* David Hyatt <hyatt@netscape.com> (Original Author)
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* Bobby Holley <bobbyholley@gmail.com>
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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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#ifndef _nsICODecoder_h
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#define _nsICODecoder_h
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#include "nsAutoPtr.h"
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#include "Decoder.h"
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#include "imgIDecoderObserver.h"
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#include "nsBMPDecoder.h"
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#include "nsPNGDecoder.h"
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#include "ICOFileHeaders.h"
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namespace mozilla {
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namespace image {
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class RasterImage;
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class nsICODecoder : public Decoder
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{
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public:
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nsICODecoder(RasterImage &aImage, imgIDecoderObserver* aObserver);
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virtual ~nsICODecoder();
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// Obtains the width of the icon directory entry
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PRUint32 GetRealWidth() const
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{
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return mDirEntry.mWidth == 0 ? 256 : mDirEntry.mWidth;
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}
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// Obtains the height of the icon directory entry
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PRUint32 GetRealHeight() const
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{
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return mDirEntry.mHeight == 0 ? 256 : mDirEntry.mHeight;
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}
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virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
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virtual void FinishInternal();
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private:
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// Writes to the contained decoder and sets the appropriate errors
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// Returns true if there are no errors.
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bool WriteToContainedDecoder(const char* aBuffer, PRUint32 aCount);
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// Processes a single dir entry of the icon resource
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void ProcessDirEntry(IconDirEntry& aTarget);
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// Sets the hotspot property of if we have a cursor
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void SetHotSpotIfCursor();
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// Creates a bitmap file header buffer, returns true if successful
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bool FillBitmapFileHeaderBuffer(PRInt8 *bfh);
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// Fixes the ICO height to match that of the BIH.
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// and also fixes the BIH height to be /2 of what it was.
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// See definition for explanation.
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// Returns false if invalid information is contained within.
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bool FixBitmapHeight(PRInt8 *bih);
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// Fixes the ICO width to match that of the BIH.
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// Returns false if invalid information is contained within.
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bool FixBitmapWidth(PRInt8 *bih);
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// Extract bitmap info header size count from BMP information header
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PRInt32 ExtractBIHSizeFromBitmap(PRInt8 *bih);
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// Extract bit count from BMP information header
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PRInt32 ExtractBPPFromBitmap(PRInt8 *bih);
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// Calculates the row size in bytes for the AND mask table
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PRUint32 CalcAlphaRowSize();
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// Obtains the number of colors from the BPP, mBPP must be filled in
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PRUint16 GetNumColors();
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PRUint16 mBPP; // Stores the images BPP
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PRUint32 mPos; // Keeps track of the position we have decoded up until
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PRUint16 mNumIcons; // Stores the number of icons in the ICO file
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PRUint16 mCurrIcon; // Stores the current dir entry index we are processing
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PRUint32 mImageOffset; // Stores the offset of the image data we want
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PRUint8 *mRow; // Holds one raw line of the image
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PRInt32 mCurLine; // Line index of the image that's currently being decoded
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PRUint32 mRowBytes; // How many bytes of the row were already received
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PRInt32 mOldLine; // Previous index of the line
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nsAutoPtr<Decoder> mContainedDecoder; // Contains either a BMP or PNG resource
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char mDirEntryArray[ICODIRENTRYSIZE]; // Holds the current dir entry buffer
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IconDirEntry mDirEntry; // Holds a decoded dir entry
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// Holds the potential bytes that can be a PNG signature
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char mSignature[PNGSIGNATURESIZE];
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// Holds the potential bytes for a bitmap information header
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char mBIHraw[40];
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// Stores whether or not the icon file we are processing has type 1 (icon)
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bool mIsCursor;
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// Stores whether or not the contained resource is a PNG
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bool mIsPNG;
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};
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} // namespace image
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} // namespace mozilla
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#endif
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