1 : /* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=4: */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is the Mozilla ICO Decoder.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Netscape.
19 : * Portions created by the Initial Developer are Copyright (C) 2001
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * David Hyatt <hyatt@netscape.com> (Original Author)
24 : * Bobby Holley <bobbyholley@gmail.com>
25 : * Brian R. Bondy <netzen@gmail.com>
26 : *
27 : * Alternatively, the contents of this file may be used under the terms of
28 : * either the GNU General Public License Version 2 or later (the "GPL"), or
29 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 : * in which case the provisions of the GPL or the LGPL are applicable instead
31 : * of those above. If you wish to allow use of your version of this file only
32 : * under the terms of either the GPL or the LGPL, and not to allow others to
33 : * use your version of this file under the terms of the MPL, indicate your
34 : * decision by deleting the provisions above and replace them with the notice
35 : * and other provisions required by the GPL or the LGPL. If you do not delete
36 : * the provisions above, a recipient may use your version of this file under
37 : * the terms of any one of the MPL, the GPL or the LGPL.
38 : *
39 : * ***** END LICENSE BLOCK ***** */
40 :
41 :
42 : #ifndef _nsICODecoder_h
43 : #define _nsICODecoder_h
44 :
45 : #include "nsAutoPtr.h"
46 : #include "Decoder.h"
47 : #include "imgIDecoderObserver.h"
48 : #include "nsBMPDecoder.h"
49 : #include "nsPNGDecoder.h"
50 : #include "ICOFileHeaders.h"
51 :
52 : namespace mozilla {
53 : namespace image {
54 :
55 : class RasterImage;
56 :
57 : class nsICODecoder : public Decoder
58 : {
59 : public:
60 :
61 : nsICODecoder(RasterImage &aImage, imgIDecoderObserver* aObserver);
62 : virtual ~nsICODecoder();
63 :
64 : // Obtains the width of the icon directory entry
65 103 : PRUint32 GetRealWidth() const
66 : {
67 103 : return mDirEntry.mWidth == 0 ? 256 : mDirEntry.mWidth;
68 : }
69 :
70 : // Obtains the height of the icon directory entry
71 7 : PRUint32 GetRealHeight() const
72 : {
73 7 : return mDirEntry.mHeight == 0 ? 256 : mDirEntry.mHeight;
74 : }
75 :
76 : virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
77 : virtual void FinishInternal();
78 :
79 : private:
80 : // Processes a single dir entry of the icon resource
81 : void ProcessDirEntry(IconDirEntry& aTarget);
82 : // Sets the hotspot property of if we have a cursor
83 : void SetHotSpotIfCursor();
84 : // Creates a bitmap file header buffer, returns true if successful
85 : bool FillBitmapFileHeaderBuffer(PRInt8 *bfh);
86 : // Fixes the ICO height to match that of the BIH.
87 : // and also fixes the BIH height to be /2 of what it was.
88 : // See definition for explanation.
89 : // Returns false if invalid information is contained within.
90 : bool FixBitmapHeight(PRInt8 *bih);
91 : // Fixes the ICO width to match that of the BIH.
92 : // Returns false if invalid information is contained within.
93 : bool FixBitmapWidth(PRInt8 *bih);
94 : // Extract bitmap info header size count from BMP information header
95 : PRInt32 ExtractBIHSizeFromBitmap(PRInt8 *bih);
96 : // Extract bit count from BMP information header
97 : PRInt32 ExtractBPPFromBitmap(PRInt8 *bih);
98 : // Calculates the row size in bytes for the AND mask table
99 : PRUint32 CalcAlphaRowSize();
100 : // Obtains the number of colors from the BPP, mBPP must be filled in
101 : PRUint16 GetNumColors();
102 :
103 : PRUint16 mBPP; // Stores the images BPP
104 : PRUint32 mPos; // Keeps track of the position we have decoded up until
105 : PRUint16 mNumIcons; // Stores the number of icons in the ICO file
106 : PRUint16 mCurrIcon; // Stores the current dir entry index we are processing
107 : PRUint32 mImageOffset; // Stores the offset of the image data we want
108 : PRUint8 *mRow; // Holds one raw line of the image
109 : PRInt32 mCurLine; // Line index of the image that's currently being decoded
110 : PRUint32 mRowBytes; // How many bytes of the row were already received
111 : PRInt32 mOldLine; // Previous index of the line
112 : nsAutoPtr<Decoder> mContainedDecoder; // Contains either a BMP or PNG resource
113 :
114 : char mDirEntryArray[ICODIRENTRYSIZE]; // Holds the current dir entry buffer
115 : IconDirEntry mDirEntry; // Holds a decoded dir entry
116 : // Holds the potential bytes that can be a PNG signature
117 : char mSignature[PNGSIGNATURESIZE];
118 : // Holds the potential bytes for a bitmap information header
119 : char mBIHraw[40];
120 : // Stores whether or not the icon file we are processing has type 1 (icon)
121 : bool mIsCursor;
122 : // Stores whether or not the contained resource is a PNG
123 : bool mIsPNG;
124 : };
125 :
126 : } // namespace image
127 : } // namespace mozilla
128 :
129 : #endif
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