// this code is copied from TQt, with fixes for not finishing decoding // prematurely /* The actual patch is: ===== --- /opt/_q/src/kernel/qmngio.cpp 2004-05-04 18:28:15.000000000 +0200 +++ gvmngformattype.cpp 2005-04-13 16:11:50.000000000 +0200 @@ -411,8 +417,11 @@ int TQMNGFormat::decode( TQImage& img, TQIm } losttime += losingtimer.elapsed(); - if ( ndata || !length ) - mng_display_resume(handle); + bool needmore = false; + if ( ndata ) { + mng_retcode r = mng_display_resume(handle); + needmore = ( r == MNG_NEEDMOREDATA ); + } losingtimer.start(); image = 0; @@ -422,6 +431,13 @@ int TQMNGFormat::decode( TQImage& img, TQIm // Move back unused tail memcpy(buffer,buffer+ubuffer,nbuffer); } + // "The function should return without processing all the data if it reaches the end of a frame in the input." + if( ndata && !needmore ) { + length -= ndata; + ndata = 0; + if( length == 0 ) // 0 means done, process at least one byte + length = ndata = 1; + } if ( ndata ) { // Not all used. enlargeBuffer(nbuffer+ndata); ===== */ /**************************************************************************** ** ** ** Implementation of MNG TQImage IOHandler ** ** Created : 970521 ** ** Copyright (C) 1997-2004 Trolltech AS. All rights reserved. ** ** This file is part of the kernel module of the TQt GUI Toolkit. ** ** This file may be distributed under the terms of the Q Public License ** as defined by Trolltech AS of Norway and appearing in the file ** LICENSE.TQPL included in the packaging of this file. ** ** This file may be distributed and/or modified under the terms of the ** GNU General Public License version 2 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. ** ** Licensees holding valid TQt Enterprise Edition or TQt Professional Edition ** licenses may use this file in accordance with the TQt Commercial License ** Agreement provided with the Software. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for ** information about TQt Commercial License Agreements. ** See http://www.trolltech.com/qpl/ for TQPL licensing information. ** See http://www.trolltech.com/gpl/ for GPL licensing information. ** ** Contact info@trolltech.com if any conditions of this licensing are ** not clear to you. ** **********************************************************************/ #include #include "tqdatetime.h" #include "mngformattype.h" //#ifndef TQT_NO_IMAGEIO_MNG #ifdef HAVE_LIBMNG #include "tqimage.h" #include "tqasyncimageio.h" #include "tqiodevice.h" // Define XMD_H prohibits the included headers of libmng.h to typedef INT32. // This is needed for Borland with STL support, since in that case, INT32 is // already defined by some Borland header. #define XMD_H #if defined(TQ_OS_UNIXWARE) # define HAVE_BOOLEAN // libjpeg under Unixware seems to need this #endif #include #include #ifndef TQT_NO_ASYNC_IMAGE_IO namespace Gwenview { class MNGFormat : public TQImageFormat { public: MNGFormat(); virtual ~MNGFormat(); int decode(TQImage& img, TQImageConsumer* consumer, const uchar* buffer, int length); bool openstream() { // ### We should figure out how many loops an MNG has, but for now always assume infinite. if (consumer) consumer->setLooping(0); return TRUE; } bool closestream( ) { if (consumer) consumer->end(); return TRUE; } bool readdata( mng_ptr pBuf, mng_uint32 iBuflen, mng_uint32p pRead ) { uint m = ndata + nbuffer - ubuffer; if ( iBuflen > m ) { iBuflen = m; } *pRead = iBuflen; uint n = nbuffer-ubuffer; if ( iBuflen < n ) { // enough in buffer memcpy(pBuf, buffer+ubuffer, iBuflen); ubuffer += iBuflen; return TRUE; } if ( n ) { // consume buffer memcpy(pBuf, buffer+ubuffer, n ); pBuf = (mng_ptr)((char*)pBuf + n); iBuflen -= n; ubuffer = nbuffer; } if ( iBuflen ) { // fill from incoming data memcpy(pBuf, data, iBuflen); data += iBuflen; ndata -= iBuflen; } return TRUE; } bool errorproc( mng_int32 iErrorcode, mng_int8 /*iSeverity*/, mng_chunkid iChunkname, mng_uint32 /*iChunkseq*/, mng_int32 iExtra1, mng_int32 iExtra2, mng_pchar zErrortext ) { tqWarning("MNG error %d: %s; chunk %c%c%c%c; subcode %d:%d", iErrorcode,zErrortext, (iChunkname>>24)&0xff, (iChunkname>>16)&0xff, (iChunkname>>8)&0xff, (iChunkname>>0)&0xff, iExtra1,iExtra2); return TRUE; } bool processheader( mng_uint32 iWidth, mng_uint32 iHeight ) { image->create(iWidth,iHeight,32); image->setAlphaBuffer(TRUE); memset(image->bits(),0,iWidth*iHeight*4); consumer->setSize(iWidth,iHeight); mng_set_canvasstyle(handle, TQImage::systemByteOrder() == TQImage::LittleEndian ? MNG_CANVAS_BGRA8 : MNG_CANVAS_ARGB8 ); return TRUE; } mng_ptr getcanvasline( mng_uint32 iLinenr ) { return image->scanLine(iLinenr); } mng_bool refresh( mng_uint32 x, mng_uint32 y, mng_uint32 w, mng_uint32 h ) { TQRect r(x,y,w,h); consumer->changed(r); consumer->setFramePeriod(0); consumer->frameDone(); return TRUE; } mng_uint32 gettickcount( ) { return timer.elapsed() - losttime; } bool settimer( mng_uint32 iMsecs ) { consumer->setFramePeriod(iMsecs); consumer->frameDone(); state = Time; losingtimer.start(); losttime -= iMsecs; return TRUE; } private: // Animation-level information enum { MovieStart, Time, Data, Data2 } state; // Image-level information mng_handle handle; // For storing unused data uchar *buffer; uint maxbuffer; uint nbuffer; // Timing TQTime timer; TQTime losingtimer; int losttime; void enlargeBuffer(uint n) { if ( n > maxbuffer ) { maxbuffer = n; buffer = (uchar*)realloc(buffer,n); } } // Temporary locals during single data-chunk processing const uchar* data; uint ndata; uint ubuffer; TQImageConsumer* consumer; TQImage* image; }; class MNGFormatType : public TQImageFormatType { TQImageFormat* decoderFor(const uchar* buffer, int length); const char* formatName() const; }; /* \class TQMNGFormat qmngio.h \brief Incremental image decoder for MNG image format. \ingroup images \ingroup graphics This subclass of TQImageFormat decodes MNG format images, including animated MNGs. Animated MNG images are standard MNG images. The MNG standard defines two extension chunks that are useful for animations:
gIFg - GIF-like Graphic Control Extension
Includes frame disposal, user input flag (we ignore this), and inter-frame delay.
gIFx - GIF-like Application Extension
Multi-purpose, but we just use the Netscape extension which specifies looping.
The subimages usually contain a offset chunk (oFFs) but need not. The first image defines the "screen" size. Any subsequent image that doesn't fit is clipped. TODO: decide on this point. gIFg gives disposal types, so it can be done. All images paste (\e not composite, just place all-channel copying) over the previous image to produce a subsequent frame. */ /* \class TQMNGFormatType qasyncimageio.h \brief Incremental image decoder for MNG image format. \ingroup images \ingroup graphics \ingroup io This subclass of TQImageFormatType recognizes MNG format images, creating a TQMNGFormat when required. An instance of this class is created automatically before any other factories, so you should have no need for such objects. */ TQImageFormat* MNGFormatType::decoderFor( const uchar* buffer, int length ) { if (length < 8) return 0; if ( ( buffer[0]==138 // MNG signature && buffer[1]=='M' && buffer[2]=='N' && buffer[3]=='G' && buffer[4]==13 && buffer[5]==10 && buffer[6]==26 && buffer[7]==10 ) || ( buffer[0]==139 // JNG signature && buffer[1]=='J' && buffer[2]=='N' && buffer[3]=='G' && buffer[4]==13 && buffer[5]==10 && buffer[6]==26 && buffer[7]==10 ) #ifdef TQT_NO_IMAGEIO_PNG // if we don't have native PNG support use libmng || ( buffer[0]==137 // PNG signature && buffer[1]=='P' && buffer[2]=='N' && buffer[3]=='G' && buffer[4]==13 && buffer[5]==10 && buffer[6]==26 && buffer[7]==10 ) #endif ) { return new MNGFormat; } return 0; } const char* MNGFormatType::formatName() const { return "MNG"; } /*! Constructs a TQMNGFormat. */ MNGFormat::MNGFormat() { state = MovieStart; handle = 0; nbuffer = 0; maxbuffer = 0; buffer = 0; losttime = 0; } /* Destroys a TQMNGFormat. */ MNGFormat::~MNGFormat() { // We're setting the consumer to 0 since it may have been // deleted by read_async_image in qimage.cpp consumer = 0; if (handle) mng_cleanup(&handle); } // C-callback to C++-member-function conversion // static mng_bool openstream( mng_handle handle ) { return ((MNGFormat*)mng_get_userdata(handle))->openstream(); } static mng_bool closestream( mng_handle handle ) { return ((MNGFormat*)mng_get_userdata(handle))->closestream(); } static mng_bool readdata( mng_handle handle, mng_ptr pBuf, mng_uint32 iBuflen, mng_uint32p pRead ) { return ((MNGFormat*)mng_get_userdata(handle))->readdata(pBuf,iBuflen,pRead); } static mng_bool errorproc( mng_handle handle, mng_int32 iErrorcode, mng_int8 iSeverity, mng_chunkid iChunkname, mng_uint32 iChunkseq, mng_int32 iExtra1, mng_int32 iExtra2, mng_pchar zErrortext ) { return ((MNGFormat*)mng_get_userdata(handle))->errorproc(iErrorcode, iSeverity,iChunkname,iChunkseq,iExtra1,iExtra2,zErrortext); } static mng_bool processheader( mng_handle handle, mng_uint32 iWidth, mng_uint32 iHeight ) { return ((MNGFormat*)mng_get_userdata(handle))->processheader(iWidth,iHeight); } static mng_ptr getcanvasline( mng_handle handle, mng_uint32 iLinenr ) { return ((MNGFormat*)mng_get_userdata(handle))->getcanvasline(iLinenr); } static mng_bool refresh( mng_handle handle, mng_uint32 iTop, mng_uint32 iLeft, mng_uint32 iBottom, mng_uint32 iRight ) { return ((MNGFormat*)mng_get_userdata(handle))->refresh(iTop,iLeft,iBottom,iRight); } static mng_uint32 gettickcount( mng_handle handle ) { return ((MNGFormat*)mng_get_userdata(handle))->gettickcount(); } static mng_bool settimer( mng_handle handle, mng_uint32 iMsecs ) { return ((MNGFormat*)mng_get_userdata(handle))->settimer(iMsecs); } static mng_ptr memalloc( mng_size_t iLen ) { return calloc(1,iLen); } static void memfree( mng_ptr iPtr, mng_size_t /*iLen*/ ) { free(iPtr); } /*! This function decodes some data into image changes. Returns the number of bytes consumed. */ int MNGFormat::decode( TQImage& img, TQImageConsumer* cons, const uchar* buf, int length ) { consumer = cons; image = &img; data = buf; ndata = length; ubuffer = 0; if ( state == MovieStart ) { handle = mng_initialize( (mng_ptr)this, Gwenview::memalloc, Gwenview::memfree, 0 ); mng_set_suspensionmode( handle, MNG_TRUE ); mng_setcb_openstream( handle, Gwenview::openstream ); mng_setcb_closestream( handle, Gwenview::closestream ); mng_setcb_readdata( handle, Gwenview::readdata ); mng_setcb_errorproc( handle, Gwenview::errorproc ); mng_setcb_processheader( handle, Gwenview::processheader ); mng_setcb_getcanvasline( handle, Gwenview::getcanvasline ); mng_setcb_refresh( handle, Gwenview::refresh ); mng_setcb_gettickcount( handle, Gwenview::gettickcount ); mng_setcb_settimer( handle, Gwenview::settimer ); state = Data; mng_readdisplay(handle); losingtimer.start(); } losttime += losingtimer.elapsed(); bool needmore = false; if ( ndata ) { mng_retcode r = mng_display_resume(handle); needmore = ( r == MNG_NEEDMOREDATA ); } losingtimer.start(); image = 0; nbuffer -= ubuffer; if ( nbuffer ) { // Move back unused tail memcpy(buffer,buffer+ubuffer,nbuffer); } // "The function should return without processing all the data if it reaches the end of a frame in the input." if( ndata && !needmore ) { length -= ndata; ndata = 0; if( length == 0 ) // 0 means done, process at least one byte length = ndata = 1; } if ( ndata ) { // Not all used. enlargeBuffer(nbuffer+ndata); memcpy(buffer+nbuffer,data,ndata); nbuffer += ndata; } return length; } static MNGFormatType* globalMngFormatTypeObject = 0; #endif // TQT_NO_ASYNC_IMAGE_IO #ifndef TQT_NO_ASYNC_IMAGE_IO void gvCleanupMngIO() { if ( globalMngFormatTypeObject ) { delete globalMngFormatTypeObject; globalMngFormatTypeObject = 0; } } #endif void gvInitMngIO() { static bool done = FALSE; if ( !done ) { done = TRUE; #ifndef TQT_NO_ASYNC_IMAGE_IO globalMngFormatTypeObject = new MNGFormatType; tqAddPostRoutine( gvCleanupMngIO ); #endif } } #else void gvInitMngIO() {} namespace Gwenview { #endif MNG::MNG() { gvInitMngIO(); } } // namespace