Bug 688238. imglib: Move Decoder::Init() arguments into the constructor. r=joedrew

This makes the lifetime of the arguments more clear. i.e. that they stay the same
for the lifetime of the decoder.

--HG--
extra : rebase_source : 99726522b99d9d546f41d1d4e78e44224101e9b3

modules/libpr0n/decoders/nsBMPDecoder.cpp

@@ -63,17 +63,18 @@ PRLogModuleInfo *gBMPLog = PR_NewLogModule("BMPDecoder");
 #define LINE(row) ((mBIH.height < 0) ? (-mBIH.height - (row)) : ((row) - 1))
 #define PIXEL_OFFSET(row, col) (LINE(row) * mBIH.width + col)
 
-nsBMPDecoder::nsBMPDecoder()
+nsBMPDecoder::nsBMPDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver)
+ : Decoder(aImage, aObserver)
 {
-    mColors = nsnull;
-    mRow = nsnull;
-    mImageData = nsnull;
-    mCurPos = mPos = mNumColors = mRowBytes = 0;
-    mOldLine = mCurLine = 1; // Otherwise decoder will never start
-    mState = eRLEStateInitial;
-    mStateData = 0;
-    mLOH = WIN_HEADER_LENGTH;
-    mUseAlphaData = mHaveAlphaData = PR_FALSE;
+  mColors = nsnull;
+  mRow = nsnull;
+  mImageData = nsnull;
+  mCurPos = mPos = mNumColors = mRowBytes = 0;
+  mOldLine = mCurLine = 1; // Otherwise decoder will never start
+  mState = eRLEStateInitial;
+  mStateData = 0;
+  mLOH = WIN_HEADER_LENGTH;
+  mUseAlphaData = mHaveAlphaData = PR_FALSE;
 }
 
 nsBMPDecoder::~nsBMPDecoder()

modules/libpr0n/decoders/nsBMPDecoder.h

@@ -59,7 +59,7 @@ class nsBMPDecoder : public Decoder
 {
 public:
 
-    nsBMPDecoder();
+    nsBMPDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver);
     ~nsBMPDecoder();
 
     // Specifies whether or not the BMP file will contain alpha data

modules/libpr0n/decoders/nsGIFDecoder2.cpp

@@ -107,8 +107,9 @@ namespace imagelib {
 //////////////////////////////////////////////////////////////////////
 // GIF Decoder Implementation
 
-nsGIFDecoder2::nsGIFDecoder2()
-  : mCurrentRow(-1)
+nsGIFDecoder2::nsGIFDecoder2(RasterImage *aImage, imgIDecoderObserver* aObserver)
+  : Decoder(aImage, aObserver)
+  , mCurrentRow(-1)
   , mLastFlushedRow(-1)
   , mImageData(nsnull)
   , mOldColor(0)

modules/libpr0n/decoders/nsGIFDecoder2.h

@@ -58,7 +58,7 @@ class nsGIFDecoder2 : public Decoder
 {
 public:
 
-  nsGIFDecoder2();
+  nsGIFDecoder2(RasterImage *aImage, imgIDecoderObserver* aObserver);
   ~nsGIFDecoder2();
 
   virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);

modules/libpr0n/decoders/nsICODecoder.cpp

@@ -99,7 +99,8 @@ nsICODecoder::GetNumColors()
 }
 
 
-nsICODecoder::nsICODecoder()
+nsICODecoder::nsICODecoder(RasterImage *aImage, imgIDecoderObserver* aObserver)
+ : Decoder(aImage, aObserver)
 {
   mPos = mImageOffset = mCurrIcon = mNumIcons = mBPP = mRowBytes = 0;
   mIsPNG = PR_FALSE;
@@ -317,8 +318,8 @@ nsICODecoder::WriteInternal(const char* aBuffer, PRUint32 aCount)
     mIsPNG = !memcmp(mSignature, nsPNGDecoder::pngSignatureBytes, 
                      PNGSIGNATURESIZE);
     if (mIsPNG) {
-      mContainedDecoder = new nsPNGDecoder();
-      mContainedDecoder->InitSharedDecoder(mImage, mObserver);
+      mContainedDecoder = new nsPNGDecoder(mImage, mObserver);
+      mContainedDecoder->InitSharedDecoder();
       mContainedDecoder->Write(mSignature, PNGSIGNATURESIZE);
       mDataError = mContainedDecoder->HasDataError();
       if (mContainedDecoder->HasDataError()) {
@@ -386,11 +387,11 @@ nsICODecoder::WriteInternal(const char* aBuffer, PRUint32 aCount)
     // Init the bitmap decoder which will do most of the work for us
     // It will do everything except the AND mask which isn't present in bitmaps
     // bmpDecoder is for local scope ease, it will be freed by mContainedDecoder
-    nsBMPDecoder *bmpDecoder = new nsBMPDecoder(); 
+    nsBMPDecoder *bmpDecoder = new nsBMPDecoder(mImage, mObserver); 
     mContainedDecoder = bmpDecoder;
     bmpDecoder->SetUseAlphaData(PR_TRUE);
     mContainedDecoder->SetSizeDecode(IsSizeDecode());
-    mContainedDecoder->InitSharedDecoder(mImage, mObserver);
+    mContainedDecoder->InitSharedDecoder();
 
     // The ICO format when containing a BMP does not include the 14 byte
     // bitmap file header. To use the code of the BMP decoder we need to 

modules/libpr0n/decoders/nsICODecoder.h

@@ -58,7 +58,7 @@ class nsICODecoder : public Decoder
 {
 public:
 
-  nsICODecoder();
+  nsICODecoder(RasterImage *aImage, imgIDecoderObserver* aObserver);
   virtual ~nsICODecoder();
 
   // Obtains the width of the icon directory entry

modules/libpr0n/decoders/nsIconDecoder.cpp

@@ -50,13 +50,14 @@
 namespace mozilla {
 namespace imagelib {
 
-nsIconDecoder::nsIconDecoder() :
-  mWidth(-1),
-  mHeight(-1),
-  mPixBytesRead(0),
-  mPixBytesTotal(0),
-  mImageData(nsnull),
-  mState(iconStateStart)
+nsIconDecoder::nsIconDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver)
+ : Decoder(aImage, aObserver),
+   mWidth(-1),
+   mHeight(-1),
+   mPixBytesRead(0),
+   mPixBytesTotal(0),
+   mImageData(nsnull),
+   mState(iconStateStart)
 {
   // Nothing to do
 }

modules/libpr0n/decoders/nsIconDecoder.h

@@ -74,7 +74,7 @@ class nsIconDecoder : public Decoder
 {
 public:
 
-  nsIconDecoder();
+  nsIconDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver);
   virtual ~nsIconDecoder();
 
   virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);

modules/libpr0n/decoders/nsJPEGDecoder.cpp

@@ -109,7 +109,8 @@ METHODDEF(void) my_error_exit (j_common_ptr cinfo);
 #define MAX_JPEG_MARKER_LENGTH  (((PRUint32)1 << 16) - 1)
 
 
-nsJPEGDecoder::nsJPEGDecoder()
+nsJPEGDecoder::nsJPEGDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver)
+ : Decoder(aImage, aObserver)
 {
   mState = JPEG_HEADER;
   mReading = PR_TRUE;

modules/libpr0n/decoders/nsJPEGDecoder.h

@@ -86,7 +86,7 @@ class RasterImage;
 class nsJPEGDecoder : public Decoder
 {
 public:
-  nsJPEGDecoder();
+  nsJPEGDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver);
   virtual ~nsJPEGDecoder();
 
   virtual void InitInternal();

modules/libpr0n/decoders/nsPNGDecoder.cpp

@@ -81,13 +81,14 @@ static PRLogModuleInfo *gPNGDecoderAccountingLog =
 const PRUint8 
 nsPNGDecoder::pngSignatureBytes[] = { 137, 80, 78, 71, 13, 10, 26, 10 };
 
-nsPNGDecoder::nsPNGDecoder() :
-  mPNG(nsnull), mInfo(nsnull),
-  mCMSLine(nsnull), interlacebuf(nsnull),
-  mInProfile(nsnull), mTransform(nsnull),
-  mHeaderBuf(nsnull), mHeaderBytesRead(0),
-  mChannels(0), mFrameIsHidden(PR_FALSE),
-  mCMSMode(0), mDisablePremultipliedAlpha(PR_FALSE)
+nsPNGDecoder::nsPNGDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver)
+ : Decoder(aImage, aObserver),
+   mPNG(nsnull), mInfo(nsnull),
+   mCMSLine(nsnull), interlacebuf(nsnull),
+   mInProfile(nsnull), mTransform(nsnull),
+   mHeaderBuf(nsnull), mHeaderBytesRead(0),
+   mChannels(0), mFrameIsHidden(PR_FALSE),
+   mCMSMode(0), mDisablePremultipliedAlpha(PR_FALSE)
 {
 }
 

modules/libpr0n/decoders/nsPNGDecoder.h

@@ -59,7 +59,7 @@ class RasterImage;
 class nsPNGDecoder : public Decoder
 {
 public:
-  nsPNGDecoder();
+  nsPNGDecoder(RasterImage *aImage, imgIDecoderObserver* aObserver);
   virtual ~nsPNGDecoder();
 
   virtual void InitInternal();

modules/libpr0n/src/Decoder.cpp

@@ -44,7 +44,7 @@
 namespace mozilla {
 namespace imagelib {
 
-Decoder::Decoder()
+Decoder::Decoder(RasterImage *aImage, imgIDecoderObserver* aObserver)
   : mDecodeFlags(0)
   , mFrameCount(0)
   , mFailCode(NS_OK)
@@ -54,6 +54,12 @@ Decoder::Decoder()
   , mDecodeDone(false)
   , mDataError(false)
 {
+  // We should always have an image
+  NS_ABORT_IF_FALSE(aImage, "Can't initialize decoder without an image!");
+
+  // Save our paremeters
+  mImage = aImage;
+  mObserver = aObserver;
 }
 
 Decoder::~Decoder()
@@ -67,17 +73,10 @@ Decoder::~Decoder()
  */
 
 void
-Decoder::Init(RasterImage* aImage, imgIDecoderObserver* aObserver)
+Decoder::Init()
 {
-  // We should always have an image
-  NS_ABORT_IF_FALSE(aImage, "Can't initialize decoder without an image!");
-
   // No re-initializing
-  NS_ABORT_IF_FALSE(mImage == nsnull, "Can't re-initialize a decoder!");
-
-  // Save our paremeters
-  mImage = aImage;
-  mObserver = aObserver;
+  NS_ABORT_IF_FALSE(!mInitialized, "Can't re-initialize a decoder!");
 
   // Fire OnStartDecode at init time to support bug 512435
   if (!IsSizeDecode() && mObserver)
@@ -90,18 +89,11 @@ Decoder::Init(RasterImage* aImage, imgIDecoderObserver* aObserver)
 
 // Initializes a decoder whose aImage and aObserver is already being used by a
 // parent decoder
-void 
-Decoder::InitSharedDecoder(RasterImage* aImage, imgIDecoderObserver* aObserver) 
+void
+Decoder::InitSharedDecoder()
 {
-  // We should always have an image
-  NS_ABORT_IF_FALSE(aImage, "Can't initialize decoder without an image!");
-
   // No re-initializing
-  NS_ABORT_IF_FALSE(mImage == nsnull, "Can't re-initialize a decoder!");
-
-  // Save our parameters
-  mImage = aImage;
-  mObserver = aObserver;
+  NS_ABORT_IF_FALSE(!mInitialized, "Can't re-initialize a decoder!");
 
   // Implementation-specific initialization
   InitInternal();

modules/libpr0n/src/Decoder.h

@@ -50,7 +50,7 @@ class Decoder
 {
 public:
 
-  Decoder();
+  Decoder(RasterImage* aImage, imgIDecoderObserver* aObserver);
   virtual ~Decoder();
 
   /**
@@ -61,7 +61,7 @@ public:
    *
    * Notifications Sent: TODO
    */
-  void Init(RasterImage* aImage, imgIDecoderObserver* aObserver);
+  void Init();
 
 
   /**
@@ -73,7 +73,7 @@ public:
    *
    * Notifications Sent: TODO
    */
-  void InitSharedDecoder(RasterImage* aImage, imgIDecoderObserver* aObserver);
+  void InitSharedDecoder();
 
   /**
    * Writes data to the decoder.

modules/libpr0n/src/RasterImage.cpp

@@ -2167,35 +2167,35 @@ RasterImage::InitDecoder(bool aDoSizeDecode)
   eDecoderType type = GetDecoderType(mSourceDataMimeType.get());
   CONTAINER_ENSURE_TRUE(type != eDecoderType_unknown, NS_IMAGELIB_ERROR_NO_DECODER);
 
+  nsCOMPtr<imgIDecoderObserver> observer(do_QueryReferent(mObserver));
   // Instantiate the appropriate decoder
   switch (type) {
     case eDecoderType_png:
-      mDecoder = new nsPNGDecoder();
+      mDecoder = new nsPNGDecoder(this, observer);
       break;
     case eDecoderType_gif:
-      mDecoder = new nsGIFDecoder2();
+      mDecoder = new nsGIFDecoder2(this, observer);
       break;
     case eDecoderType_jpeg:
-      mDecoder = new nsJPEGDecoder();
+      mDecoder = new nsJPEGDecoder(this, observer);
       break;
     case eDecoderType_bmp:
-      mDecoder = new nsBMPDecoder();
+      mDecoder = new nsBMPDecoder(this, observer);
       break;
     case eDecoderType_ico:
-      mDecoder = new nsICODecoder();
+      mDecoder = new nsICODecoder(this, observer);
       break;
     case eDecoderType_icon:
-      mDecoder = new nsIconDecoder();
+      mDecoder = new nsIconDecoder(this, observer);
       break;
     default:
       NS_ABORT_IF_FALSE(0, "Shouldn't get here!");
   }
 
   // Initialize the decoder
-  nsCOMPtr<imgIDecoderObserver> observer(do_QueryReferent(mObserver));
   mDecoder->SetSizeDecode(aDoSizeDecode);
   mDecoder->SetDecodeFlags(mFrameDecodeFlags);
-  mDecoder->Init(this, observer);
+  mDecoder->Init();
   CONTAINER_ENSURE_SUCCESS(mDecoder->GetDecoderError());
 
   // Create a decode worker