The Tor Browser / file comparison
comparison: image/decoders/nsICODecoder.h
image/decoders/nsICODecoder.h
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| 1 /* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=4: */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 | |
| 7 #ifndef _nsICODecoder_h | |
| 8 #define _nsICODecoder_h | |
| 9 | |
| 10 #include "nsAutoPtr.h" | |
| 11 #include "Decoder.h" | |
| 12 #include "nsBMPDecoder.h" | |
| 13 #include "nsPNGDecoder.h" | |
| 14 #include "ICOFileHeaders.h" | |
| 15 | |
| 16 namespace mozilla { | |
| 17 namespace image { | |
| 18 | |
| 19 class RasterImage; | |
| 20 | |
| 21 class nsICODecoder : public Decoder | |
| 22 { | |
| 23 public: | |
| 24 | |
| 25 nsICODecoder(RasterImage &aImage); | |
| 26 virtual ~nsICODecoder(); | |
| 27 | |
| 28 // Obtains the width of the icon directory entry | |
| 29 uint32_t GetRealWidth() const | |
| 30 { | |
| 31 return mDirEntry.mWidth == 0 ? 256 : mDirEntry.mWidth; | |
| 32 } | |
| 33 | |
| 34 // Obtains the height of the icon directory entry | |
| 35 uint32_t GetRealHeight() const | |
| 36 { | |
| 37 return mDirEntry.mHeight == 0 ? 256 : mDirEntry.mHeight; | |
| 38 } | |
| 39 | |
| 40 virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy); | |
| 41 virtual void FinishInternal(); | |
| 42 virtual bool NeedsNewFrame() const; | |
| 43 virtual nsresult AllocateFrame(); | |
| 44 | |
| 45 private: | |
| 46 // Writes to the contained decoder and sets the appropriate errors | |
| 47 // Returns true if there are no errors. | |
| 48 bool WriteToContainedDecoder(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy); | |
| 49 | |
| 50 // Processes a single dir entry of the icon resource | |
| 51 void ProcessDirEntry(IconDirEntry& aTarget); | |
| 52 // Sets the hotspot property of if we have a cursor | |
| 53 void SetHotSpotIfCursor(); | |
| 54 // Creates a bitmap file header buffer, returns true if successful | |
| 55 bool FillBitmapFileHeaderBuffer(int8_t *bfh); | |
| 56 // Fixes the ICO height to match that of the BIH. | |
| 57 // and also fixes the BIH height to be /2 of what it was. | |
| 58 // See definition for explanation. | |
| 59 // Returns false if invalid information is contained within. | |
| 60 bool FixBitmapHeight(int8_t *bih); | |
| 61 // Fixes the ICO width to match that of the BIH. | |
| 62 // Returns false if invalid information is contained within. | |
| 63 bool FixBitmapWidth(int8_t *bih); | |
| 64 // Extract bitmap info header size count from BMP information header | |
| 65 int32_t ExtractBIHSizeFromBitmap(int8_t *bih); | |
| 66 // Extract bit count from BMP information header | |
| 67 int32_t ExtractBPPFromBitmap(int8_t *bih); | |
| 68 // Calculates the row size in bytes for the AND mask table | |
| 69 uint32_t CalcAlphaRowSize(); | |
| 70 // Obtains the number of colors from the BPP, mBPP must be filled in | |
| 71 uint16_t GetNumColors(); | |
| 72 | |
| 73 uint16_t mBPP; // Stores the images BPP | |
| 74 uint32_t mPos; // Keeps track of the position we have decoded up until | |
| 75 uint16_t mNumIcons; // Stores the number of icons in the ICO file | |
| 76 uint16_t mCurrIcon; // Stores the current dir entry index we are processing | |
| 77 uint32_t mImageOffset; // Stores the offset of the image data we want | |
| 78 uint8_t *mRow; // Holds one raw line of the image | |
| 79 int32_t mCurLine; // Line index of the image that's currently being decoded | |
| 80 uint32_t mRowBytes; // How many bytes of the row were already received | |
| 81 int32_t mOldLine; // Previous index of the line | |
| 82 nsAutoPtr<Decoder> mContainedDecoder; // Contains either a BMP or PNG resource | |
| 83 | |
| 84 char mDirEntryArray[ICODIRENTRYSIZE]; // Holds the current dir entry buffer | |
| 85 IconDirEntry mDirEntry; // Holds a decoded dir entry | |
| 86 // Holds the potential bytes that can be a PNG signature | |
| 87 char mSignature[PNGSIGNATURESIZE]; | |
| 88 // Holds the potential bytes for a bitmap information header | |
| 89 char mBIHraw[40]; | |
| 90 // Stores whether or not the icon file we are processing has type 1 (icon) | |
| 91 bool mIsCursor; | |
| 92 // Stores whether or not the contained resource is a PNG | |
| 93 bool mIsPNG; | |
| 94 }; | |
| 95 | |
| 96 } // namespace image | |
| 97 } // namespace mozilla | |
| 98 | |
| 99 #endif |
