1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/decoders/nsICODecoder.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,99 @@
1.4 +/* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=4: */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +
1.10 +#ifndef _nsICODecoder_h
1.11 +#define _nsICODecoder_h
1.12 +
1.13 +#include "nsAutoPtr.h"
1.14 +#include "Decoder.h"
1.15 +#include "nsBMPDecoder.h"
1.16 +#include "nsPNGDecoder.h"
1.17 +#include "ICOFileHeaders.h"
1.18 +
1.19 +namespace mozilla {
1.20 +namespace image {
1.21 +
1.22 +class RasterImage;
1.23 +
1.24 +class nsICODecoder : public Decoder
1.25 +{
1.26 +public:
1.27 +
1.28 + nsICODecoder(RasterImage &aImage);
1.29 + virtual ~nsICODecoder();
1.30 +
1.31 + // Obtains the width of the icon directory entry
1.32 + uint32_t GetRealWidth() const
1.33 + {
1.34 + return mDirEntry.mWidth == 0 ? 256 : mDirEntry.mWidth;
1.35 + }
1.36 +
1.37 + // Obtains the height of the icon directory entry
1.38 + uint32_t GetRealHeight() const
1.39 + {
1.40 + return mDirEntry.mHeight == 0 ? 256 : mDirEntry.mHeight;
1.41 + }
1.42 +
1.43 + virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);
1.44 + virtual void FinishInternal();
1.45 + virtual bool NeedsNewFrame() const;
1.46 + virtual nsresult AllocateFrame();
1.47 +
1.48 +private:
1.49 + // Writes to the contained decoder and sets the appropriate errors
1.50 + // Returns true if there are no errors.
1.51 + bool WriteToContainedDecoder(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);
1.52 +
1.53 + // Processes a single dir entry of the icon resource
1.54 + void ProcessDirEntry(IconDirEntry& aTarget);
1.55 + // Sets the hotspot property of if we have a cursor
1.56 + void SetHotSpotIfCursor();
1.57 + // Creates a bitmap file header buffer, returns true if successful
1.58 + bool FillBitmapFileHeaderBuffer(int8_t *bfh);
1.59 + // Fixes the ICO height to match that of the BIH.
1.60 + // and also fixes the BIH height to be /2 of what it was.
1.61 + // See definition for explanation.
1.62 + // Returns false if invalid information is contained within.
1.63 + bool FixBitmapHeight(int8_t *bih);
1.64 + // Fixes the ICO width to match that of the BIH.
1.65 + // Returns false if invalid information is contained within.
1.66 + bool FixBitmapWidth(int8_t *bih);
1.67 + // Extract bitmap info header size count from BMP information header
1.68 + int32_t ExtractBIHSizeFromBitmap(int8_t *bih);
1.69 + // Extract bit count from BMP information header
1.70 + int32_t ExtractBPPFromBitmap(int8_t *bih);
1.71 + // Calculates the row size in bytes for the AND mask table
1.72 + uint32_t CalcAlphaRowSize();
1.73 + // Obtains the number of colors from the BPP, mBPP must be filled in
1.74 + uint16_t GetNumColors();
1.75 +
1.76 + uint16_t mBPP; // Stores the images BPP
1.77 + uint32_t mPos; // Keeps track of the position we have decoded up until
1.78 + uint16_t mNumIcons; // Stores the number of icons in the ICO file
1.79 + uint16_t mCurrIcon; // Stores the current dir entry index we are processing
1.80 + uint32_t mImageOffset; // Stores the offset of the image data we want
1.81 + uint8_t *mRow; // Holds one raw line of the image
1.82 + int32_t mCurLine; // Line index of the image that's currently being decoded
1.83 + uint32_t mRowBytes; // How many bytes of the row were already received
1.84 + int32_t mOldLine; // Previous index of the line
1.85 + nsAutoPtr<Decoder> mContainedDecoder; // Contains either a BMP or PNG resource
1.86 +
1.87 + char mDirEntryArray[ICODIRENTRYSIZE]; // Holds the current dir entry buffer
1.88 + IconDirEntry mDirEntry; // Holds a decoded dir entry
1.89 + // Holds the potential bytes that can be a PNG signature
1.90 + char mSignature[PNGSIGNATURESIZE];
1.91 + // Holds the potential bytes for a bitmap information header
1.92 + char mBIHraw[40];
1.93 + // Stores whether or not the icon file we are processing has type 1 (icon)
1.94 + bool mIsCursor;
1.95 + // Stores whether or not the contained resource is a PNG
1.96 + bool mIsPNG;
1.97 +};
1.98 +
1.99 +} // namespace image
1.100 +} // namespace mozilla
1.101 +
1.102 +#endif
