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Wrap

C/C++ Source or Header | 1998-05-24 | 92.0 KB | 2,532 lines

/* ** ** $VER: dispatch.c 2.3 (24.5.98) ** gifanim.datatype 2.3 ** ** Dispatch routine for a DataTypes class ** ** Written 1997/1998 by Roland 'Gizzy' Mainz ** Original example source from David N. Junod ** */ /* main includes */ #include "classbase.h" #include "classdata.h" /* ansi includes */ #include <limits.h> /*****************************************************************************/ /* debugging */ #if 0 void kprintf( STRPTR, ... ); #define D( x ) x #else #define D( x ) #endif /*****************************************************************************/ /* decoder related local prototypes */ static BOOL ReadColorMap( struct ClassBase *, struct GIFAnimInstData *, UWORD, struct ColorRegister * ); static int DoExtension( struct ClassBase *, Object *, struct GIFAnimInstData *, TEXT ); static int GetDataBlock( struct ClassBase *, struct GIFAnimInstData *, UBYTE * ); static int GetCode( struct ClassBase *, struct GIFAnimInstData *, int, BOOL ); static int LWZReadByte( struct ClassBase *, struct GIFAnimInstData *, BOOL, int ); static int ReadImage( struct ClassBase *, struct GIFAnimInstData *, UBYTE *, UWORD, UWORD, UWORD, UWORD, UWORD, BOOL, BOOL, UWORD ); static void WriteDeltaPixelArray8Fast( struct BitMap *, UBYTE *, UBYTE * ); static int getbase2( int ); static BOOL ReadOK( struct ClassBase *, struct GIFDecoder *, void *, ULONG ); /*****************************************************************************/ /* local prototypes */ static BOOL ScanFrames( struct ClassBase *, Object * ); static struct FrameNode *AllocFrameNode( struct ClassBase *, APTR ); static struct FrameNode *FindFrameNode( struct MinList *, ULONG ); static void FreeFrameNodeResources( struct ClassBase *, struct GIFAnimInstData * ); static struct BitMap *AllocFrameBitMap( struct ClassBase *, struct GIFAnimInstData * ); static void FreeFrameBitMap( struct ClassBase *, struct GIFAnimInstData *, struct BitMap * ); static struct BitMap *AllocBitMapPooled( struct ClassBase *, ULONG, ULONG, ULONG, APTR ); static struct FrameNode *GetPrevFrameNode( struct FrameNode *, ULONG ); static void AttachSample( struct ClassBase *, struct GIFAnimInstData * ); /*****************************************************************************/ /* Create "gifanim.datatype" BOOPSI class */ struct IClass *initClass( struct ClassBase *cb ) { struct IClass *cl; /* Create our class... */ if( cl = MakeClass( GIFANIMDTCLASS, ANIMATIONDTCLASS, NULL, (ULONG)sizeof( struct GIFAnimInstData ), 0UL ) ) { #define DTSTACKSIZE (16384UL) cl -> cl_Dispatcher . h_Entry = (HOOKFUNC)StackSwapDispatch; /* see stackswap.c */ cl -> cl_Dispatcher . h_SubEntry = (HOOKFUNC)Dispatch; /* see stackswap.c */ cl -> cl_Dispatcher . h_Data = (APTR)DTSTACKSIZE; /* see stackswap.c */ cl -> cl_UserData = (ULONG)cb; AddClass( cl ); } return( cl ); } /* class dispatcher */ DISPATCHERFLAGS ULONG Dispatch( REGA0 struct IClass *cl, REGA2 Object *o, REGA1 Msg msg ) { struct ClassBase *cb = (struct ClassBase *)(cl -> cl_UserData); struct GIFAnimInstData *gaid; ULONG retval = 0UL; switch( msg -> MethodID ) { /****** gifanim.datatype/OM_NEW ********************************************** * * NAME * OM_NEW -- Create a gifanim.datatype object. * * FUNCTION * The OM_NEW method is used to create an instance of the * gifanim.datatype class. This method is passed to the superclass * first. After this, gifanim.datatype parses the prefs file and makes * a scan through the data to get index information. Frame bitmaps are * loaded if the input stream isn't seekable, colormaps and the first * frame are loaded immediately. * If a sample was set in the prefs, it will be loaded and attached * to the animation. * * ATTRIBUTES * The following attributes can be specified at creation time. * * DTA_SourceType (ULONG) -- Determinates the type of DTA_Handle * attribute. Only DTST_FILE and DTST_RAM are supported. * If any other type was set in a given DTA_SourceType, * OM_NEW will be rejected. * Defaults to DTST_FILE. * * DTA_Handle -- For DTST_FILE, a BPTR filehandle is expected. This * handle will be created by datatypesclass depeding on the DTF_#? * flag, which is DTF_BINARY here. DTST_FILE, datatypesclass * creates a file handle from the given DTA_Name and DTA_Handle * (a BPTR returned by Lock). * A DTST_RAM (create empty object) source type requires a NULL * handle. * * RESULT * If the object was created a pointer to the object is returned, * otherwise NULL is returned. * ****************************************************************************** * */ case OM_NEW: { struct TagItem *ti; /* We only support DTST_FILE or DTST_RAM as source type */ if( ti = FindTagItem( DTA_SourceType, (((struct opSet *)msg) -> ops_AttrList) ) ) { if( ((ti -> ti_Data) != DTST_FILE) && ((ti -> ti_Data) != DTST_RAM) ) { SetIoErr( ERROR_OBJECT_WRONG_TYPE ); break; } } if( retval = DoSuperMethodA( cl, o, msg ) ) { /* Load frames... */ if( !ScanFrames( cb, (Object *)retval ) ) { /* Something went fatally wrong, dispose object */ CoerceMethod( cl, (Object *)retval, OM_DISPOSE ); retval = 0UL; } } } break; /****** gifanim.datatype/OM_DISPOSE ****************************************** * * NAME * OM_DISPOSE -- Delete a gifanim.datatype object. * * FUNCTION * The OM_DISPOSE method is used to delete an instance of the * gifanim.datatype class. This method is passed to the superclass when * it has completed. * This method frees all frame nodes and their contents (bitmaps, * colormaps, samples etc.) * * RESULT * The object is deleted. 0UL is returned. * ****************************************************************************** * */ case OM_DISPOSE: { LONG saved_ioerr = IoErr(); /* Get a pointer to our object data */ gaid = (struct GIFAnimInstData *)INST_DATA( cl, o ); /* Wait for any outstanding blitter usage (which may use one of our bitmaps) */ WaitBlit(); /* Free colormaps etc. (e.g. all resources which are NOT free'ed on DeletePool below) */ FreeFrameNodeResources( cb, gaid ); /* Free our key bitmap */ FreeBitMap( (gaid -> gaid_KeyBitMap) ); /* Delete the frame pool */ DeletePool( (gaid -> gaid_Pool) ); /* Close input file */ if( gaid -> gaid_FH ) { Close( (gaid -> gaid_FH) ); } /* Close verbose output file */ if( (gaid -> gaid_VerboseOutput) && ((gaid -> gaid_VerboseOutput) != -1L) ) { Close( (gaid -> gaid_VerboseOutput) ); } /* Dispose object */ DoSuperMethodA( cl, o, msg ); /* Restore Result2 */ SetIoErr( saved_ioerr ); } break; /* TEST TEST / Support for format change "on-the-fly" disabled here / TEST TEST * DO NOT make any assumptions on this EXPERIMENTAL code ! */ #ifdef COMMENTED_OUT case DTM_FRAMEBOX: { struct dtFrameBox *dtf = (struct dtFrameBox *)msg; gaid = (struct GIFAnimInstData *)INST_DATA( cl, o ); /* pass to superclas first */ retval = DoSuperMethodA( cl, o, msg ); /* Does someone tell me in what for an environment (screen) I'll be attached to ? */ if( (dtf -> dtf_FrameFlags) & FRAMEF_SPECIFY ) { if( dtf -> dtf_ContentsInfo ) { if( dtf -> dtf_ContentsInfo -> fri_Screen ) { struct BitMap *bm = dtf -> dtf_ContentsInfo -> fri_Screen -> RastPort . BitMap; /* Does we have a non-planar bitmap ? */ if( !(GetBitMapAttr( bm, BMA_FLAGS ) & BMF_STANDARD) ) { /* I assume here that the system is able to map a 24 bit bitmap into the screen * if it is deeper than 8 bit. */ if( ((bm -> Depth) > 8UL) && ((dtf -> dtf_ContentsInfo -> fri_Dimensions . Depth) > 8UL) ) { verbose_printf( cb, gaid, "using chunky bitmap\n" ); } } } } } } break; #endif /* COMMENTED_OUT */ case OM_UPDATE: { if( DoMethod( o, ICM_CHECKLOOP ) ) { break; } } case OM_SET: { /* Pass the attributes to the animation class and force a refresh if we need it */ if( retval = DoSuperMethodA( cl, o, msg ) ) { /* Top instance ? */ if( OCLASS( o ) == cl ) { struct RastPort *rp; /* Get a pointer to the rastport */ if( rp = ObtainGIRPort( (((struct opSet *)msg) -> ops_GInfo) ) ) { struct gpRender gpr; /* Force a redraw */ gpr . MethodID = GM_RENDER; gpr . gpr_GInfo = ((struct opSet *)msg) -> ops_GInfo; gpr . gpr_RPort = rp; gpr . gpr_Redraw = GREDRAW_UPDATE; DoMethodA( o, (Msg)(&gpr) ); /* Release the temporary rastport */ ReleaseGIRPort( rp ); /* We did a refresh... */ retval = 0UL; } } } } break; /****** gifanim.datatype/DTM_WRITE ******************************************* * * NAME * DTM_WRITE -- Save data * * FUNCTION * This method saves the object's contents to disk. * * If dtw_Mode is DTWM_IFF, the method is passed unchanged to the * superclass, animation.datatype, which writes a single IFF ILBM * picture. * * If dtw_mode is DTWM_RAW, the object saved an GIF Animation stream * to the filehandle given, starting with the current frame until * the end is reached. * The sequence saved can be controlled by the ADTA_Frame, ADTA_Frames * and ADTA_FrameIncrement attributes (see TAGS section below). * * TAGS * When writing the local ("raw") format, GIF Animation, the following * attributes are recognized: * * ADTA_Frame (ULONG) - start frame, saving starts here. * Defaults to the current frame displayed. * * ADTA_Frames (ULONG) - the number of frames to be saved, * Defaults to (max_num_of_frames - curr_frame). * * ADTA_FrameIncrement (ULONG) - frame increment when saving. * Defaults to 1, which means: "jump to next frame". * * NOTE * - Any sound attached to the animation will NOT be saved. * * - A CTRL-D signal to the writing process aborts the save. * * RESULT * Returns 0 for failure (IoErr() returns result2), non-zero * for success. * ****************************************************************************** * */ case DTM_WRITE: { struct dtWrite *dtw; dtw = (struct dtWrite *)msg; /* Local data format requested ?... */ if( (dtw -> dtw_Mode) == DTWM_RAW ) { retval = SaveGIFAnim( cb, cl, o, dtw ); } else { /* Pass msg to superclass (which writes a single frame as an IFF ILBM picture)... */ retval = DoSuperMethodA( cl, o, msg ); } } break; /****** gifanim.datatype/ADTM_LOADFRAME ***************************************** * * NAME * ADTM_LOADFRAME -- Load frame * * FUNCTION * The ADTM_LOADFRAME method is used to obtain the bitmap and timing * data of the animation. * The given timestamp will be used to find a matching timestamp * in the internal FrameNode list. If it was found, the corresponding * timing, bitmap and colormap data are stored into the struct * adtFrame. If the bitmap wasn't loaded, this method attempts to * load it from disk. * * RESULT * the bitmap ptr if a bitmap was found, * 0 (and result2 with the reason). * ****************************************************************************** * */ case ADTM_LOADFRAME: { struct adtFrame *alf = (struct adtFrame *)msg; struct adtFrame freeframe; struct FrameNode *fn; LONG error = 0L; gaid = (struct GIFAnimInstData *)INST_DATA( cl, o ); ObtainSemaphore( (&(gaid -> gaid_SigSem)) ); /* Like "realloc": Free any given frame (the free is done AFTER the load to * avoid that a frame which is loaded will be freed and then loaded again... */ if( alf -> alf_UserData ) { /* Copy message contents that we can call ADTM_UNLOADFRAME below */ freeframe = *alf; alf -> alf_UserData = NULL; /* "freeframe" now owns the frame data to free ! */ } else { /* No data to free... */ freeframe . alf_UserData = NULL; } /* Find frame by timestamp */ if( fn = FindFrameNode( (&(gaid -> gaid_FrameList)), (alf -> alf_TimeStamp) ) ) { /* Load bitmaps only if we don't cache the whole anim and * if we have a filehandle to load from (an empty object created using DTST_RAM won't have this)... */ if( (!(gaid -> gaid_LoadAll)) && (gaid -> gaid_FH) ) { /* If no bitmap is loaded, load it... */ if( !(fn -> fn_BitMap) ) { ULONG animwidth = (ULONG)(gaid -> gaid_PaddedWidth), animheight = (ULONG)(gaid -> gaid_Height); /* Allocate array for chunkypixel data */ if( fn -> fn_ChunkyMap = (UBYTE *)AllocVecPooled( cb, (gaid -> gaid_Pool), ((animwidth * animheight) + 256) ) ) { /* Get a clean background to avoid that rubbish shows througth transparent parts */ memset( (fn -> fn_ChunkyMap), 0, (size_t)(animwidth * animheight) ); if( fn -> fn_BitMap = AllocFrameBitMap( cb, gaid ) ) { struct FrameNode *worknode = fn; struct FrameNode *prevnode = NULL; ULONG rollback = 0UL; UBYTE *deltamap = NULL; struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); /* shortcut */ /* See if we need a rollback (if TRUE, we copy (below) the previous chunkymap into our * current chunkymap as background. If Left/Top != 0 or transparent colors are present, * parts of this previous image will occur). */ switch( fn -> fn_GIF89aDisposal ) { case GIF89A_DISPOSE_NODISPOSE: case GIF89A_DISPOSE_RESTOREPREVIOUS: { do { worknode = GetPrevFrameNode( worknode, 1UL ); rollback++; } while( ((worknode -> fn_ChunkyMap) == NULL) && ((worknode -> fn_TimeStamp) != 0UL) ); } break; } if( ((worknode -> fn_ChunkyMap) == NULL) && ((worknode -> fn_TimeStamp) == 0UL) ) { error_printf( cb, gaid, "first frame without bitmap ... !\n" ); } do { ULONG current = rollback; worknode = fn; while( current-- ) { worknode = GetPrevFrameNode( worknode, 1UL ); } if( (worknode -> fn_ChunkyMap) && (worknode != fn) ) { prevnode = worknode; } else { if( Seek( (gaid -> gaid_FH), ((worknode -> fn_BMOffset) - (gaid -> gaid_CurrFilePos)), OFFSET_CURRENT ) != (-1L) ) { if( gifdec -> file_buffer = AllocVec( ((worknode -> fn_BMSize) + 16UL), MEMF_PUBLIC ) ) { BOOL useGlobalColormap; UWORD bitPixel; UBYTE buf[ 16 ]; /* Init buffer */ gifdec -> buffer = gifdec -> file_buffer; gifdec -> buffersize = worknode -> fn_BMSize; gifdec -> which_fh = WHICHFH_BUFFER; /* Fill buffer */ if( Read( (gifdec -> file), (gifdec -> buffer), (gifdec -> buffersize) ) == (gifdec -> buffersize) ) { /* This "Read" can't fail because it comes from our memory buffer */ (void)ReadOK( cb, gifdec, buf, 9 ); useGlobalColormap = !BitSet( buf[ 8 ], LOCALCOLORMAP ); bitPixel = 1 << ((buf[ 8 ] & 0x07) + 1); /* disposal method */ switch( worknode -> fn_GIF89aDisposal ) { case GIF89A_DISPOSE_NOP: { /* Background not transparent ? */ if( ((worknode -> fn_GIF89aTransparent) == ~0U) || ((worknode -> fn_GIF89aTransparent) != 0U) ) { /* Restore to color 0 */ memset( (fn -> fn_ChunkyMap), 0, (size_t)(animwidth * animheight) ); } } break; case GIF89A_DISPOSE_NODISPOSE: { /* do not dispose prev image */ /* Check if we have a prevnode link to the previous image. * If this is NULL, we assume that our chunkymap already contain * the previous image */ if( prevnode ) { CopyMem( (prevnode -> fn_ChunkyMap), (fn -> fn_ChunkyMap), (animwidth * animheight) ); #ifdef DELTAWPA8 CopyBitMap( cb, (fn -> fn_BitMap), (prevnode -> fn_BitMap), animwidth, animheight ); deltamap = prevnode -> fn_ChunkyMap; #endif /* DELTAWPA8 */ } else { #ifdef DELTAWPA8 deltamap = NULL; #endif /* DELTAWPA8 */ } } break; case GIF89A_DISPOSE_RESTOREBACKGROUND: { /* Background not transparent ? */ if( ((worknode -> fn_GIF89aTransparent) == ~0U) || ((worknode -> fn_GIF89aTransparent) != (gaid -> gaid_GIFDec . GifScreen . Background)) ) { /* Restore to background color */ memset( (fn -> fn_ChunkyMap), (gaid -> gaid_GIFDec . GifScreen . Background), (size_t)(animwidth * animheight) ); } } break; case GIF89A_DISPOSE_RESTOREPREVIOUS: { /* restore image of previous frame */ /* Check if we have a prevnode link to the previous image. * If this is NULL, we assume that our chunkymap already contain * the previous image */ if( prevnode ) { CopyMem( (prevnode -> fn_ChunkyMap), (fn -> fn_ChunkyMap), (animwidth * animheight) ); #ifdef DELTAWPA8 CopyBitMap( cb, (fn -> fn_BitMap), (prevnode -> fn_BitMap), animwidth, animheight ); deltamap = prevnode -> fn_ChunkyMap; #endif /* DELTAWPA8 */ } else { #ifdef DELTAWPA8 deltamap = NULL; #endif /* DELTAWPA8 */ } } break; default: /* GIF89A_DISPOSE_RESERVED4 - GIF89A_DISPOSE_RESERVED7 */ { error_printf( cb, gaid, "unsupported disposal method %lu\n", (ULONG)(gaid -> gaid_GIFDec . Gif89 . disposal) ); } break; } if( !useGlobalColormap ) { /* Skip colormap (in buffer) */ gifdec -> buffer += (GIFCMAPENTRYSIZE * bitPixel); } (void)ReadImage( cb, gaid, (fn -> fn_ChunkyMap), (UWORD)animwidth, LOHI2UINT16( buf[ 0 ], buf[ 1 ] ), LOHI2UINT16( buf[ 2 ], buf[ 3 ] ), LOHI2UINT16( buf[ 4 ], buf[ 5 ] ), LOHI2UINT16( buf[ 6 ], buf[ 7 ] ), BitSet( buf[ 8 ], INTERLACE ), FALSE, (worknode -> fn_GIF89aTransparent) ); } FreeVec( (gifdec -> file_buffer) ); gifdec -> file_buffer = gifdec -> buffer = NULL; } /* Bump file pos */ gaid -> gaid_CurrFilePos = Seek( (gaid -> gaid_FH), 0L, OFFSET_CURRENT ); /* BUG: does not check for failure */ } else { /* seek failed */ error = IoErr(); break; } prevnode = NULL; /* a previous image is now in our chunkymap, * we don't need the link anymore */ } } while( rollback-- ); if( error == 0L ) { if( fn -> fn_ChunkyMap ) { if( gaid -> gaid_UseChunkyMap ) { WriteRGBPixelArray8( cb, (fn -> fn_BitMap), animwidth, animheight, (fn -> fn_ColorMap), (fn -> fn_ChunkyMap) ); } else { WriteDeltaPixelArray8Fast( (fn -> fn_BitMap), (fn -> fn_ChunkyMap), deltamap ); } } } } else { /* can't alloc bitmap */ error = ERROR_NO_FREE_STORE; } } else { /* can't alloc chunkymap */ error = ERROR_NO_FREE_STORE; } } } /* Store timing/context information */ alf -> alf_Duration = fn -> fn_Duration; alf -> alf_Frame = fn -> fn_Frame; alf -> alf_UserData = (APTR)fn; /* Links back to this FrameNode (used by ADTM_UNLOADFRAME) */ /* Store bitmap information */ alf -> alf_BitMap = fn -> fn_BitMap; alf -> alf_CMap = ((gaid -> gaid_UseChunkyMap)?(NULL):(fn -> fn_CMap)); /* we does not use a colormap with a direct RGB-coded bitmap */ /* Is there a sample to play ? */ if( fn -> fn_Sample ) { /* Store sound information */ alf -> alf_Sample = fn -> fn_Sample; alf -> alf_SampleLength = fn -> fn_SampleLength; alf -> alf_Period = fn -> fn_Period; } else { /* No sound */ alf -> alf_Sample = NULL; alf -> alf_SampleLength = 0UL; alf -> alf_Period = 0UL; } /* Frame "in use", even for a unsuccessful result; on error * animation.datatype send an ADTM_UNLOADFRAME which frees * allocated resources and decreases the "UseCount"... */ fn -> fn_UseCount++; /* Return bitmap ptr of possible, 0UL and error cause otherwise */ retval = ((error)?(0UL):(ULONG)(alf -> alf_BitMap)); /* Result */ } else { /* no matching frame found */ error = ERROR_OBJECT_NOT_FOUND; } /* Like "realloc": Free any given frame here */ if( freeframe . alf_UserData ) { freeframe . MethodID = ADTM_UNLOADFRAME; DoMethodA( o, (Msg)(&freeframe) ); } SetIoErr( error ); /* Result2 */ ReleaseSemaphore( (&(gaid -> gaid_SigSem)) ); } break; /****** gifanim.datatype/ADTM_UNLOADFRAME ************************************ * * NAME * ADTM_UNLOADFRAME -- Unload frame contents * * FUNCTION * The ADTM_UNLOADFRAME method is used to release the contents of a * animation frame. * * This method frees the bitmap data found in adtFrame. * * RESULT * Returns always 0UL. * ****************************************************************************** * */ case ADTM_UNLOADFRAME: { struct FrameNode *fn; struct adtFrame *alf; gaid = (struct GIFAnimInstData *)INST_DATA( cl, o ); alf = (struct adtFrame *)msg; /* Free bitmaps only if we don't cache the whole anim */ if( (gaid -> gaid_LoadAll) == FALSE ) { ObtainSemaphore( (&(gaid -> gaid_SigSem)) ); if( fn = (struct FrameNode *)(alf -> alf_UserData) ) { if( (fn -> fn_UseCount) > 0 ) { fn -> fn_UseCount--; /* Free an existing bitmap if it isn't in use and if it is NOT the first bitmap */ if( ((fn -> fn_UseCount) == 0) && (fn -> fn_BitMap) && (fn != (struct FrameNode *)(gaid -> gaid_FrameList . mlh_Head)) ) { FreeFrameBitMap( cb, gaid, (fn -> fn_BitMap) ); FreeVecPooled( cb, (gaid -> gaid_Pool), (fn -> fn_ChunkyMap) ); fn -> fn_BitMap = NULL; fn -> fn_ChunkyMap = NULL; } } } ReleaseSemaphore( (&(gaid -> gaid_SigSem)) ); } /* The frame has been freed ! */ alf -> alf_UserData = NULL; } break; /* Let the superclass handle everything else */ default: { retval = DoSuperMethodA( cl, o, msg ); } break; } return( retval ); } static BOOL ScanFrames( struct ClassBase *cb, Object *o ) { struct GIFAnimInstData *gaid = (struct GIFAnimInstData *)INST_DATA( (cb -> cb_Lib . cl_Class), o ); LONG error = 0L; BOOL success = FALSE; InitSemaphore( (&(gaid -> gaid_SigSem)) ); NewList( (struct List *)(&(gaid -> gaid_FrameList)) ); /* Create a memory pool for frame nodes */ if( gaid -> gaid_Pool = CreatePool( MEMF_PUBLIC, 8192UL, 8192UL ) ) { BPTR fh; /* handle (file handle) */ ULONG sourcetype; /* type of stream (either DTST_FILE or DTST_RAM) */ ULONG modeid /*= (ULONG)INVALID_ID*/; /* anim view mode */ ULONG animwidth, /* anim width */ animheight, /* anim height */ animdepth; /* anim depth */ ULONG timestamp = 0UL; /* timestamp */ /* Prefs defaults */ gaid -> gaid_LoadAll = TRUE; /* The decoder is too slow to allow realtime decoding of a * 576 * 124 * 8 GIF Image, even on a mc68040 :-(( */ gaid -> gaid_ModeID = (ULONG)INVALID_ID; /* no screen mode selected yet */ gaid -> gaid_Volume = 64UL; /* Read prefs */ ReadENVPrefs( cb, gaid, NULL ); /* Get file handle, handle type and BitMapHeader */ if( GetDTAttrs( o, DTA_SourceType, (&sourcetype), DTA_Handle, (&fh), DTA_Name, (&(gaid -> gaid_ProjectName)), TAG_DONE ) == 3UL ) { switch( sourcetype ) { case DTST_FILE: { if( fh ) { BPTR lock; if( lock = DupLockFromFH( fh ) ) { /* Set up a filehandle for disk-based loading (random loading) */ if( gaid -> gaid_FH = (LONG)OpenFromLock( lock ) ) { success = TRUE; } else { /* failure */ UnLock( lock ); } } } /* OpenFromLock failed ? - Then open by name :-( */ if( (gaid -> gaid_FH) == NULL ) { /* Set up a filehandle for disk-based loading (random loading) */ if( gaid -> gaid_FH = (LONG)Open( (gaid -> gaid_ProjectName), MODE_OLDFILE ) ) { success = TRUE; } else { /* Can't open file */ error = IoErr(); } } } break; case DTST_RAM: /* empty object */ { success = TRUE; } break; default: { /* unsupported source type */ error = ERROR_NOT_IMPLEMENTED; } break; } /* Any error ? */ if( success ) { /* Now we enter the next stage of testing... */ success = FALSE; if( fh ) { struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); struct FrameNode *fn; ULONG numcmaps = 0UL; /* number of created cmaps */ UBYTE buf[ 16 ]; struct ColorRegister localColorMap[ MAXCOLORMAPSIZE ] = { 0 }; struct ColorRegister savedTransparentColor = { 0 }; UBYTE c; BOOL useGlobalColormap; UWORD bitPixel; gifdec -> file = fh; gifdec -> Gif89 . transparent = (UWORD)~0U; /* means: no transparent color */ /* Read "GIF" indentifer and version */ if( ReadOK( cb, gifdec, buf, 6 ) ) { /* Is there the GIF signature ? */ if( !strncmp( (char *)buf, "GIF", 3 ) ) { STRPTR version = (STRPTR)(buf + 3); /* Check if we support this GIF version */ if( (!strncmp( version, "87a", 3 )) || (!strncmp( version, "89a", 3 )) ) { /* Read GIF Screen */ if( ReadOK( cb, gifdec, buf, 7 ) ) { struct FrameNode *prevnode = NULL; UBYTE *deltamap = NULL; gifdec -> GifScreen . Width = LOHI2UINT16( buf[ 0 ], buf[ 1 ] ); gifdec -> GifScreen . Height = LOHI2UINT16( buf[ 2 ], buf[ 3 ] ); gifdec -> GifScreen . BitPixel = 2 << (buf[ 4 ] & 0x07); gifdec -> GifScreen . ColorResolution = (((buf[ 4 ] & 0x70) >> 3) + 1); gifdec -> GifScreen . Background = buf[ 5 ]; gifdec -> GifScreen . AspectRatio = buf[ 6 ]; gaid -> gaid_Width = gifdec -> GifScreen . Width; animwidth = gaid -> gaid_PaddedWidth = (gaid -> gaid_UseChunkyMap)?(gaid -> gaid_Width):(((gaid -> gaid_Width) + 15UL) & ~15UL); /* align for c2p-wpa (c2c does not need padding) */ animheight = gaid -> gaid_Height = gifdec -> GifScreen . Height; animdepth = gaid -> gaid_Depth = (gaid -> gaid_UseChunkyMap)?(DIRECTRGB_DEPTH):((ULONG)getbase2( (gifdec -> GifScreen . BitPixel) )); /* Global Colormap ? */ if( BitSet( buf[ 4 ], LOCALCOLORMAP ) ) { numcmaps++; if( ReadColorMap( cb, gaid, (gifdec -> GifScreen . BitPixel), (gifdec -> GifScreen . ColorMap) ) ) { error = IoErr(); error_printf( cb, gaid, "error reading global colormap\n" ); } } else { /* No global colormap ? - Then the background color in the GifScreen is a NOP */ gifdec -> GifScreen . Background = 0U; } for( ;; ) { /* Read chunk ID char */ if( !ReadOK( cb, gifdec, (&c), 1 ) ) { error = IoErr(); error_printf( cb, gaid, "EOF / read error on image data\n" ); break; } switch( c ) { case ';': /* GIF terminator ? */ { goto scandone; } case '!': /* Extension ? */ { if( ReadOK( cb, gifdec, (&c), 1 ) ) { if( DoExtension( cb, o, gaid, c ) == -1 ) { error = IoErr(); error_printf( cb, gaid, "error in extension\n" ); goto scandone; } } else { error = IoErr(); error_printf( cb, gaid, "OF / read error on extension function code\n" ); goto scandone; } } break; case ',': /* Raster data start ? */ { /* Create an prepare a new frame node */ if( fn = AllocFrameNode( cb, (gaid -> gaid_Pool) ) ) { if( (gaid -> gaid_LoadAll) || (timestamp == 0UL) ) { if( !(fn -> fn_BitMap = AllocFrameBitMap( cb, gaid ) ) ) { error = ERROR_NO_FREE_STORE; } /* Allocate array for chunkypixel data */ if( fn -> fn_ChunkyMap = (UBYTE *)AllocVecPooled( cb, (gaid -> gaid_Pool), ((animwidth * animheight) + 256) ) ) { /* Get a clean background to avoid that rubbish shows througth transparent parts */ memset( (fn -> fn_ChunkyMap), 0, (size_t)(animwidth * animheight) ); } else { error = ERROR_NO_FREE_STORE; } } if( error == 0L ) { ULONG duration; /* Get position of bitmap */ fn -> fn_BMOffset = Seek( fh, 0L, OFFSET_CURRENT ); /* BUG: does not check for failure */ D( kprintf( "pos %lu\n", (fn -> fn_BMOffset) ) ); if( !ReadOK( cb, gifdec, buf, 9 ) ) { error = IoErr(); error_printf( cb, gaid, "couldn't read left/top/width/height\n" ); goto scandone; } /* Local color map ? */ useGlobalColormap = !BitSet( buf[ 8 ], LOCALCOLORMAP ); /* Size of local color map */ bitPixel = 1 << ((buf[ 8 ] & 0x07) + 1); /* Store GIF89a related attributes */ fn -> fn_GIF89aDisposal = gifdec -> Gif89 . disposal; /* Store disposal mode for current frame */ fn -> fn_GIF89aTransparent = gifdec -> Gif89 . transparent; /* Store currents frame transparent color */ if( fn -> fn_ChunkyMap ) { /* disposal method */ switch( fn -> fn_GIF89aDisposal ) { case GIF89A_DISPOSE_NOP: { /* Background not transparent ? */ if( ((fn -> fn_GIF89aTransparent) == ~0U) || ((fn -> fn_GIF89aTransparent) != 0U) ) { /* restore to color 0 */ memset( (fn -> fn_ChunkyMap), 0, (size_t)(animwidth * animheight) ); } } break; case GIF89A_DISPOSE_NODISPOSE: { /* do not dispose prev image */ /* If we have a previous frame, copy it */ if( prevnode ) { CopyMem( (prevnode -> fn_ChunkyMap), (fn -> fn_ChunkyMap), (animwidth * animheight) ); #ifdef DELTAWPA8 CopyBitMap( cb, (fn -> fn_BitMap), (prevnode -> fn_BitMap), animwidth, animheight ); deltamap = prevnode -> fn_ChunkyMap; #endif /* DELTAWPA8 */ } else { /* Background not transparent ? */ if( ((fn -> fn_GIF89aTransparent) == ~0U) || ((fn -> fn_GIF89aTransparent) != 0U) ) { /* restore to color 0 */ memset( (fn -> fn_ChunkyMap), 0, (size_t)(animwidth * animheight) ); } #ifdef DELTAWPA8 deltamap = NULL; #endif /* DELTAWPA8 */ } } break; case GIF89A_DISPOSE_RESTOREBACKGROUND: { /* Background not transparent ? */ if( ((fn -> fn_GIF89aTransparent) == ~0U) || ((fn -> fn_GIF89aTransparent) != (gaid -> gaid_GIFDec . GifScreen . Background)) ) { /* Restore to background color */ memset( (fn -> fn_ChunkyMap), (gifdec -> GifScreen . Background), (size_t)(animwidth * animheight) ); } } break; case GIF89A_DISPOSE_RESTOREPREVIOUS: { /* restore previous image */ /* If we have a previous frame, copy it */ if( prevnode ) { CopyMem( (prevnode -> fn_ChunkyMap), (fn -> fn_ChunkyMap), (animwidth * animheight) ); #ifdef DELTAWPA8 CopyBitMap( cb, (fn -> fn_BitMap), (prevnode -> fn_BitMap), animwidth, animheight ); deltamap = prevnode -> fn_ChunkyMap; #endif /* DELTAWPA8 */ } else { /* restore to color 0 */ memset( (fn -> fn_ChunkyMap), 0, (size_t)(animwidth * animheight) ); #ifdef DELTAWPA8 deltamap = NULL; #endif /* DELTAWPA8 */ } } break; default: /* GIF89A_DISPOSE_RESERVED4 - GIF89A_DISPOSE_RESERVED7 */ { error_printf( cb, gaid, "unsupported disposal method %lu\n", (ULONG)(gifdec -> Gif89 . disposal) ); } break; } } /* Save transparent color (if we have one) */ if( ((fn -> fn_GIF89aTransparent) != ~0U) && (timestamp != 0UL) ) { savedTransparentColor = localColorMap[ (fn -> fn_GIF89aTransparent) ]; } /* Get colormap */ if( useGlobalColormap ) { /* use global colormap and depth */ bitPixel = gifdec -> GifScreen . BitPixel; memcpy( localColorMap, (gifdec -> GifScreen . ColorMap), (sizeof( struct ColorRegister ) * bitPixel) ); } else { numcmaps++; if( ReadColorMap( cb, gaid, bitPixel, localColorMap ) ) { error = IoErr(); error_printf( cb, gaid, "error reading local colormap\n" ); goto scandone; } } /* Restore transparent color (if we have one) */ if( (fn -> fn_GIF89aTransparent) != ~0U ) { localColorMap[ (fn -> fn_GIF89aTransparent) ] = savedTransparentColor; } if( !(gaid -> gaid_UseChunkyMap) ) { /* The first palette must be moved to the object's palette */ if( timestamp == 0UL ) { if( !CMAP2Object( cb, o, (UBYTE *)localColorMap, (ULONG)(bitPixel * 3UL) ) ) { /* can't alloc object's color table */ error = ERROR_NO_FREE_STORE; } } /* Create a palette-per-frame colormap here */ if( !(fn -> fn_CMap = CMAP2ColorMap( cb, (1UL << (ULONG)(gaid -> gaid_Depth)), (UBYTE *)localColorMap, (ULONG)(bitPixel * 3UL) )) ) { /* can't alloc colormap */ error = ERROR_NO_FREE_STORE; } } /* Copy colormap for 24 bit output */ memcpy( (void *)(fn -> fn_ColorMap), (void *)localColorMap, (size_t)(sizeof( struct ColorRegister ) * bitPixel) ); (void)ReadImage( cb, gaid, (fn -> fn_ChunkyMap), (UWORD)animwidth, LOHI2UINT16( buf[ 0 ], buf[ 1 ] ), LOHI2UINT16( buf[ 2 ], buf[ 3 ] ), LOHI2UINT16( buf[ 4 ], buf[ 5 ] ), LOHI2UINT16( buf[ 6 ], buf[ 7 ] ), BitSet( buf[ 8 ], INTERLACE ), ((fn -> fn_BitMap) == NULL), (fn -> fn_GIF89aTransparent) ); /* Get size of bitmap (curr_pos - start_of_bm) */ fn -> fn_BMSize = Seek( fh, 0L, OFFSET_CURRENT ) - (fn -> fn_BMOffset); /* BUG: does not check for failure */ if( fn -> fn_BitMap ) { if( gaid -> gaid_UseChunkyMap ) { WriteRGBPixelArray8( cb, (fn -> fn_BitMap), animwidth, animheight, (fn -> fn_ColorMap), (fn -> fn_ChunkyMap) ); } else { WriteDeltaPixelArray8Fast( (fn -> fn_BitMap), (fn -> fn_ChunkyMap), deltamap ); } } /* Bump timestamp... */ if( ((gifdec -> Gif89 . delayTime) != ~0U) && ((gifdec -> Gif89 . delayTime) > 1U) && ((gifdec -> Gif89 . delayTime) < 2000U) ) { duration = (gifdec -> Gif89 . delayTime); } else { duration = 0UL; } fn -> fn_TimeStamp = timestamp; fn -> fn_Frame = timestamp; fn -> fn_Duration = duration; AddTail( (struct List *)(&(gaid -> gaid_FrameList)), (struct Node *)(&(fn -> fn_Node)) ); prevnode = fn; /* Next frame starts at timestamp... */ timestamp += (fn -> fn_Duration) + 1UL; } } } break; case 0x00: /* padding byte ? */ { /* Padding bytes are not part of the Compuserve documents, but... */ if( !(gaid -> gaid_StrictSyntax) ) { break; } } /* fall througth */ default: /* Not a valid raster data start character ? */ { error_printf( cb, gaid, "invalid character 0x%02x, ignoring\n", (int)c ); } break; } /* on error break */ if( error ) { break; } } scandone: /* Any frames ? */ if( timestamp && (error == 0L) && numcmaps ) { if( numcmaps == 1UL ) { /* We only have a global colormap and no colormap changes (or a direct RGB bitmap), * delete first colormap (a colormap in the first frames indicates following colormap * changes) */ struct FrameNode *firstnode = (struct FrameNode *)(gaid -> gaid_FrameList . mlh_Head); if( firstnode -> fn_CMap ) { FreeColorMap( (firstnode -> fn_CMap) ); firstnode -> fn_CMap = NULL; } } else { /* All frames must have a colormap, therefore we replicate the colormap * from the previous colormap if one is missing */ struct FrameNode *worknode, *nextnode; struct ColorMap *currcm = NULL; verbose_printf( cb, gaid, "Animation has palette changes per frame\n" ); worknode = (struct FrameNode *)(gaid -> gaid_FrameList . mlh_Head); while( nextnode = (struct FrameNode *)(worknode -> fn_Node . mln_Succ) ) { if( worknode -> fn_CMap ) { /* Current node contains colormap, this are the colors for the following frames... */ currcm = worknode -> fn_CMap; } else { if( currcm ) { /* Copy colormap from previous one... */ if( !(worknode -> fn_CMap = CopyColorMap( cb, currcm )) ) { /* Can't copy/alloc colormap */ error = ERROR_NO_FREE_STORE; } } else { verbose_printf( cb, gaid, "scan/load: no colormap, can't copy it\n" ); } } worknode = nextnode; } } } /* Check for required information */ if( error == 0L ) { /* Any frames loaded ? */ if( timestamp == 0UL ) { /* not enougth frames (at least one required) */ error = DTERROR_NOT_ENOUGH_DATA; } } /* Any error ? */ if( error == 0L ) { struct FrameNode *firstfn = (struct FrameNode *)(gaid -> gaid_FrameList . mlh_Head); /* short cut to the first FrameNode */ /* Alloc bitmap as key bitmap */ if( gaid -> gaid_UseChunkyMap ) { gaid -> gaid_KeyBitMap = AllocBitMap( animwidth, animheight, animdepth, (BMF_SPECIALFMT | SHIFT_PIXFMT( DIRECTRGB_PIXFMT )), NULL ); } else { gaid -> gaid_KeyBitMap = AllocBitMap( animwidth, animheight, animdepth, BMF_CLEAR, NULL ); } if( gaid -> gaid_KeyBitMap ) { if( (firstfn -> fn_BitMap) == NULL ) { /* can't alloc first bitmap */ error = ERROR_NO_FREE_STORE; } if( error == 0L ) { /* Copy first frame into key bitmap */ CopyBitMap( cb, (gaid -> gaid_KeyBitMap), (firstfn -> fn_BitMap), animwidth, animheight ); /* No screen mode id set by prefs ? */ if( (gaid -> gaid_ModeID) != (ULONG)INVALID_ID ) { modeid = gaid -> gaid_ModeID; } else { if( gaid -> gaid_UseChunkyMap ) { /* We don't have fixed values for cybergfx mode id's, therefore we have to ask for them */ if( (modeid = BestCModeIDTags( CYBRBIDTG_NominalWidth, animwidth, CYBRBIDTG_NominalHeight, animheight, CYBRBIDTG_Depth, animdepth, TAG_DONE )) == INVALID_ID ) { #if 0 error = 1L; /* inducate an error here :-( */ #else /* Workaround for CyberGFX bug :-( */ if( (modeid = BestCModeIDTags( CYBRBIDTG_NominalWidth, 640UL, CYBRBIDTG_NominalHeight, 480UL, CYBRBIDTG_Depth, animdepth, TAG_DONE )) == INVALID_ID ) { modeid = 0UL; error_printf( cb, gaid, "'CyberGFX bug' workaround failed, too ! Using lores.\n" ); } #endif error_printf( cb, gaid, "No screenmode available for %lu/%lu/%lu\n", animwidth, animheight, animdepth ); } } else { /* BUG: Does currently not support SUPERHIRES modes */ if( animwidth >= 640UL ) { if( animheight >= 400 ) { modeid = HIRESLACE_KEY; } else { modeid = HIRES_KEY; } } else { if( animheight >= 400 ) { modeid = LORESLACE_KEY; } else { modeid = LORES_KEY; } } } } /* No fps set by prefs ? */ if( (gaid -> gaid_FPS) == 0UL ) { gaid -> gaid_FPS = 100; /* defaults to 100 fps. GIF 89a delay values counts in * 1/100 sec steps. We set the alf_Duration field * to this value (got from the GIF 89a extension). */ } AttachSample( cb, gaid ); verbose_printf( cb, gaid, "width %lu height %lu depth %lu frames %lu fps %lu\n", animwidth, animheight, animdepth, timestamp, (gaid -> gaid_FPS) ); /* Set misc. attributes */ SetDTAttrs( o, NULL, NULL, DTA_ObjName, (gaid -> gaid_ProjectName), DTA_TotalHoriz, animwidth, DTA_TotalVert, animheight, ADTA_Width, (gaid -> gaid_Width), ADTA_Height, animheight, ADTA_Depth, animdepth, ADTA_Frames, timestamp, ADTA_FramesPerSecond, (gaid -> gaid_FPS), ADTA_ModeID, modeid, ADTA_KeyFrame, (gaid -> gaid_KeyBitMap), XTAG( (firstfn -> fn_Sample), ADTA_Sample ), (firstfn -> fn_Sample), XTAG( (firstfn -> fn_Sample), ADTA_SampleLength ), ((firstfn -> fn_SampleLength) / ((firstfn -> fn_Duration) + 1UL)), XTAG( (firstfn -> fn_Sample), ADTA_Period ), (firstfn -> fn_Period), XTAG( (firstfn -> fn_Sample), ADTA_Volume ), (gaid -> gaid_Volume), TAG_DONE ); /* All done for now... */ success = TRUE; } } else { /* can't alloc key bitmap */ error = ERROR_NO_FREE_STORE; } } } else { error = IoErr(); error_printf( cb, gaid, "failed to read gif screen descriptor\n" ); } } else { /* unsupported GIF version number */ error = DTERROR_UNKNOWN_COMPRESSION; error_printf( cb, gaid, "bad version number, not '87a' or '89a'\n" ); } } else { /* no GIF signature */ error = ERROR_OBJECT_WRONG_TYPE; error_printf( cb, gaid, "not a GIF file\n" ); } } else { error = IoErr(); error_printf( cb, gaid, "error reading magic number\n" ); } /* Prepare decoder for dynamic frame access */ gifdec -> file = gaid -> gaid_FH; } else { /* No file handle ? - Be sure we got a DTST_RAM sourcetype */ if( sourcetype == DTST_RAM ) { /* The object is used without any input file. * This "empty" object is used to run the encoder only... */ success = TRUE; } else { /* No handle ! */ error = ERROR_REQUIRED_ARG_MISSING; } } } } else { /* can't get required attributes from superclass */ error = ERROR_OBJECT_WRONG_TYPE; } } else { /* no memory pool */ error = ERROR_NO_FREE_STORE; } SetIoErr( error ); return( success ); } static struct FrameNode *AllocFrameNode( struct ClassBase *cb, APTR pool ) { struct FrameNode *fn; if( fn = (struct FrameNode *)AllocPooled( pool, (ULONG)sizeof( struct FrameNode ) ) ) { memset( fn, 0, sizeof( struct FrameNode ) ); } return( fn ); } static struct FrameNode *FindFrameNode( struct MinList *fnl, ULONG timestamp ) { if( fnl ) { struct FrameNode *worknode, *nextnode, *prevnode; prevnode = worknode = (struct FrameNode *)(fnl -> mlh_Head); while( nextnode = (struct FrameNode *)(worknode -> fn_Node . mln_Succ) ) { if( (worknode -> fn_TimeStamp) > timestamp ) { return( prevnode ); } prevnode = worknode; worknode = nextnode; } if( !IsListEmpty( ((struct List *)fnl) ) ) { return( prevnode ); } } return( NULL ); } static void FreeFrameNodeResources( struct ClassBase *cb, struct GIFAnimInstData *gaid ) { struct FrameNode *worknode; /* The follwoing was used for debugging */ /* #define FREE_LIST_IN_REVERSE_ORDER 1 */ #ifdef FREE_LIST_IN_REVERSE_ORDER struct FrameNode *nextnode; worknode = (struct FrameNode *)(gaid -> gaid_FrameList . mlh_Head); while( nextnode = (struct FrameNode *)(worknode -> fn_Node . mln_Succ) ) #else while( worknode = (struct FrameNode *)RemTail( (struct List *)(&(gaid -> gaid_FrameList)) ) ) #endif /* FREE_LIST_IN_REVERSE_ORDER */ { if( worknode -> fn_CMap ) { FreeColorMap( (worknode -> fn_CMap) ); worknode -> fn_CMap = NULL; } if( worknode -> fn_BitMap ) { FreeFrameBitMap( cb, gaid, (worknode -> fn_BitMap) ); worknode -> fn_BitMap = NULL; } #ifdef FREE_LIST_IN_REVERSE_ORDER worknode = nextnode; #endif /* FREE_LIST_IN_REVERSE_ORDER */ } } static struct BitMap *AllocFrameBitMap( struct ClassBase *cb, struct GIFAnimInstData *gaid ) { if( gaid -> gaid_UseChunkyMap ) { return( AllocBitMap( (ULONG)(gaid -> gaid_PaddedWidth), (ULONG)(gaid -> gaid_Height), (ULONG)(gaid -> gaid_Depth), (BMF_SPECIALFMT | SHIFT_PIXFMT( DIRECTRGB_PIXFMT )), NULL ) ); } else { return( AllocBitMapPooled( cb, (ULONG)(gaid -> gaid_PaddedWidth), (ULONG)(gaid -> gaid_Height), (ULONG)(gaid -> gaid_Depth), (gaid -> gaid_Pool) ) ); } } static void FreeFrameBitMap( struct ClassBase *cb, struct GIFAnimInstData *gaid, struct BitMap *bm ) { if( bm ) { if( gaid -> gaid_UseChunkyMap ) { FreeBitMap( bm ); } else { FreeVecPooled( cb, (gaid -> gaid_Pool), bm ); } } } /* This function assumes (0UL < depth) && (depth <= 8UL) */ static struct BitMap *AllocBitMapPooled( struct ClassBase *cb, ULONG width, ULONG height, ULONG depth, APTR pool ) { struct BitMap *bm; ULONG planesize, size; planesize = (ULONG)RASSIZE( width, height ) + 16UL; size = ((ULONG)sizeof( struct BitMap )) + (planesize * depth) + width; if( bm = (struct BitMap *)AllocVecPooled( cb, pool, size ) ) { UWORD pl; PLANEPTR plane; InitBitMap( bm, depth, width, height ); plane = (PLANEPTR)(bm + 1); /* First plane follows struct BitMap */ /* Set up plane data */ pl = 0U; /* Set up plane ptrs */ while( pl < depth ) { bm -> Planes[ pl ] = plane; plane = (PLANEPTR)(((UBYTE *)plane) + planesize + 8); pl++; } /* Clear the remaining plane ptrs */ while( pl < 8U ) { bm -> Planes[ pl ] = NULL; pl++; } } return( bm ); } void OpenLogfile( struct ClassBase *cb, struct GIFAnimInstData *gaid ) { if( ((gaid -> gaid_VerboseOutput) == NULL) || ((gaid -> gaid_VerboseOutput) == -1L) ) { STRPTR confile; if( confile = (STRPTR)AllocVec( (((gaid -> gaid_ProjectName)?(strlen( (gaid -> gaid_ProjectName) )):(0UL)) + 100UL), MEMF_PUBLIC ) ) { mysprintf( cb, confile, "CON:////GIF Anim DataType %s/auto/wait/close/inactive", ((gaid -> gaid_ProjectName)?(FilePart( (gaid -> gaid_ProjectName) )):(NULL)) ); gaid -> gaid_VerboseOutput = Open( confile, MODE_READWRITE ); FreeVec( confile ); } } } void error_printf( struct ClassBase *cb, struct GIFAnimInstData *gaid, STRPTR format, ... ) { if( (gaid -> gaid_VerboseOutput) != -1L ) { OpenLogfile( cb, gaid ); if( gaid -> gaid_VerboseOutput ) { VFPrintf( (gaid -> gaid_VerboseOutput), format, (APTR)((&format) + 1) ); } } } void verbose_printf( struct ClassBase *cb, struct GIFAnimInstData *gaid, STRPTR format, ... ) { if( (gaid -> gaid_VerboseOutput) && ((gaid -> gaid_VerboseOutput) != -1L) ) { VFPrintf( (gaid -> gaid_VerboseOutput), format, (APTR)((&format) + 1) ); } } static void AttachSample( struct ClassBase *cb, struct GIFAnimInstData *gaid ) { if( gaid -> gaid_Sample ) { struct FrameNode *worknode, *nextnode; ULONG period = gaid -> gaid_Period; ULONG samplesperframe; BYTE *sample = gaid -> gaid_Sample; samplesperframe = (((SysBase -> ex_EClockFrequency) * 10UL) / (period * (gaid -> gaid_FPS) * 2UL)); if( gaid -> gaid_SamplesPerFrame ) { period = (period * samplesperframe) / (gaid -> gaid_SamplesPerFrame); samplesperframe = gaid -> gaid_SamplesPerFrame; verbose_printf( cb, gaid, "period corrected from %lu to %lu to match spf=%lu with fps=%lu\n", (gaid -> gaid_Period), period, samplesperframe, (gaid -> gaid_FPS) ); } verbose_printf( cb, gaid, "Attching samples (sysclock %lu period %lu fps %lu length %lu samplesperframe %lu)...\n", (SysBase -> ex_EClockFrequency), period, (gaid -> gaid_FPS), (gaid -> gaid_SampleLength), samplesperframe ); worknode = (struct FrameNode *)(gaid -> gaid_FrameList . mlh_Head); while( nextnode = (struct FrameNode *)(worknode -> fn_Node . mln_Succ) ) { worknode -> fn_Sample = sample; worknode -> fn_SampleLength = samplesperframe * ((worknode -> fn_Duration) + 1UL); worknode -> fn_Period = period; sample += worknode -> fn_SampleLength; /* End of sample reached ? */ if( (ULONG)(sample - (gaid -> gaid_Sample)) > (gaid -> gaid_SampleLength) ) { /* Cut last size of sample to fit */ worknode -> fn_SampleLength -= (ULONG)(sample - (gaid -> gaid_Sample)); break; } worknode = nextnode; } } } /* Read a GIF colormap info a struct ColorRegister */ static BOOL ReadColorMap( struct ClassBase *cb, struct GIFAnimInstData *gaid, UWORD numcolors, struct ColorRegister *color ) { return( (BOOL)(!ReadOK( cb, (&(gaid -> gaid_GIFDec)), color, (ULONG)(GIFCMAPENTRYSIZE * numcolors) )) ); } static int DoExtension( struct ClassBase *cb, Object *o, struct GIFAnimInstData *gaid, TEXT label ) { struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); UBYTE buf[ 257 ] = { 0 }; STRPTR str; int count; switch( label ) { case 0x01: /* Plain Text Extension */ { UWORD lpos, tpos, width, height, cellw, cellh, foreground, background; error_printf( cb, gaid, "'Plain text extension' not supported yet. Please send this animation to the author that" "this can be implemented\n" ); if( GetDataBlock( cb, gaid, buf ) == -1 ) { return( -1 ); } lpos = LOHI2UINT16( buf[ 0 ], buf[ 1 ] ); tpos = LOHI2UINT16( buf[ 2 ], buf[ 3 ] ); width = LOHI2UINT16( buf[ 4 ], buf[ 5 ] ); height = LOHI2UINT16( buf[ 6 ], buf[ 7 ] ); cellw = buf[ 8 ]; cellh = buf[ 9 ]; foreground = buf[ 10 ]; background = buf[ 11 ]; verbose_printf( cb, gaid, "Plain text: " "left %lu top %lu width %lu height %lu " "cell width %lu cell height %lu" "foreground %lu background %lu", lpos, tpos, width, height, cellw, cellh, foreground, background ); while( (count = GetDataBlock( cb, gaid, buf )), ((count != 0) && (count != -1)) ) { #if 0 PPM_ASSIGN( image[ ypos ][ xpos ], cmap[ CM_RED ][ v ], cmap[ CM_GREEN ][ v ], cmap[ CM_BLUE ][ v ] ); index++; #endif /* Clear buffer for next cycle */ memset( (void *)buf, 0, sizeof( buf ) ); } return( 0 ); } case 0xf9: /* Graphic Control Extension */ { STRPTR fmt; /* Format string for verbose output (fmt changes if transparent color is set) */ if( GetDataBlock( cb, gaid, buf ) == -1 ) { return( -1 ); } /* Get "delta" mode (disposal of previous frame), input flag and the delay time in 1/100 sec) */ gifdec -> Gif89 . disposal = (buf[ 0 ] >> 2) & 0x7; gifdec -> Gif89 . inputFlag = (buf[ 0 ] >> 1) & 0x1; gifdec -> Gif89 . delayTime = LOHI2UINT16( buf[ 1 ], buf[ 2 ] ); /* Any transparent color ? */ if( buf[ 0 ] & 0x01 ) { gifdec -> Gif89 . transparent = buf[ 3 ]; fmt = "Graphic Control Extension: disposal %s (%lu)%s transparent %lu\n"; } else { fmt = "Graphic Control Extension: disposal %s (%lu)%s\n"; } /* Verbose output ? */ if( (gaid -> gaid_VerboseOutput) && ((gaid -> gaid_VerboseOutput) != -1L) ) { STRPTR user_input = ((gifdec -> Gif89 . inputFlag)?(" user input requested"):("")); STRPTR disposal; switch( gifdec -> Gif89 . disposal ) { case GIF89A_DISPOSE_NOP: disposal = "nop"; break; case GIF89A_DISPOSE_NODISPOSE: disposal = "no dispose"; break; case GIF89A_DISPOSE_RESTOREBACKGROUND: disposal = "restore background"; break; case GIF89A_DISPOSE_RESTOREPREVIOUS: disposal = "restore previous"; break; default: disposal = "reserved"; break; } verbose_printf( cb, gaid, fmt, disposal, (ULONG)(gifdec -> Gif89 . disposal), user_input, (gifdec -> Gif89 . transparent) ); } /* Ignore remaining data... */ while( (count = GetDataBlock( cb, gaid, (UBYTE *)buf )), ((count != 0) && (count != -1)) ) ; /* Return 0 (success) or -1 (error) */ return( count ); } case 0xfe: /* Comment Extension */ { STRPTR annotation; /* Get all comment extension chunks, and append them on the DTA_ObjAnnotation string we've created before */ while( (count = GetDataBlock( cb, gaid, buf )), ((count != 0) && (count != -1)) ) { ULONG size; STRPTR oldannotation; buf[ 255 ] = '\0'; /* terminate explicitly */ size = (ULONG)strlen( buf ) + 2UL; (void)GetDTAttrs( o, DTA_ObjAnnotation, (&oldannotation), TAG_DONE ); if( oldannotation ) { size += (ULONG)strlen( oldannotation ) + 2UL; } /* Allocate a temp. buffer */ if( annotation = (STRPTR)AllocMem( size, MEMF_ANY ) ) { if( oldannotation ) { strcpy( annotation, oldannotation ); } else { annotation[ 0 ] = '\0'; /* terminate */ } /* Append the new buffer */ IBMPC2ISOLatin1( buf, (annotation + strlen( annotation )) ); /* Store the comment */ SetDTAttrs( o, NULL, NULL, DTA_ObjAnnotation, annotation, TAG_DONE ); /* Free temp string */ FreeMem( annotation, size ); } /* Clear buffer for next cycle */ memset( (void *)buf, 0, sizeof( buf ) ); } /* After all, prompt the annotation to the user */ (void)GetDTAttrs( o, DTA_ObjAnnotation, (&annotation), TAG_DONE ); verbose_printf( cb, gaid, "Comment Extension: '%s'\n", annotation ); return( 0 ); } case 0xff: /* Application Extension */ { str = "Application Extension"; } break; default: { mysprintf( cb, buf, "UNKNOWN (0x%02lx)", (long)label ); str = buf; } break; } verbose_printf( cb, gaid, "got a '%s' extension\n", ((str)?(str):"") ); /* skip extension data */ while( (count = GetDataBlock( cb, gaid, buf )), ((count != 0) && (count != -1)) ) ; /* Returns 0 (success) or -1 (error) */ return( count ); } static int GetDataBlock( struct ClassBase *cb, struct GIFAnimInstData *gaid, UBYTE *buf ) { struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); UBYTE count; if( !ReadOK( cb, gifdec, &count, 1 ) ) { error_printf( cb, gaid, "error in getting DataBlock size\n" ); return( -1 ); } gifdec -> ZeroDataBlock = (count == 0); if( (count != 0) && (!ReadOK( cb, gifdec, buf, (ULONG)count ) ) ) { error_printf( cb, gaid, "error in reading DataBlock\n" ); return( -1 ); } return( count ); } /* returns -1 for error */ static int GetCode( struct ClassBase *cb, struct GIFAnimInstData *gaid, int code_size, BOOL flag ) { struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); int i, j, ret; UBYTE count; if( flag ) { gifdec -> GetCode . curbit = 0; gifdec -> GetCode . lastbit = 0; gifdec -> GetCode . done = FALSE; return( 0 ); } if( (gifdec -> GetCode . curbit + code_size) >= (gifdec -> GetCode . lastbit) ) { if( gifdec -> GetCode . done ) { if( (gifdec -> GetCode . curbit) >= (gifdec -> GetCode . lastbit) ) error_printf( cb, gaid, "GetCode: ran off the end of my bits\n" ); return( -1 ); } gifdec -> GetCode . buf[ 0 ] = gifdec -> GetCode . buf[ gifdec -> GetCode . last_byte - 2 ]; gifdec -> GetCode . buf[ 1 ] = gifdec -> GetCode . buf[ gifdec -> GetCode . last_byte - 1 ]; if( (count = GetDataBlock( cb, gaid, (&(gifdec -> GetCode . buf[ 2 ])) )) == 0 ) gifdec -> GetCode . done = TRUE; gifdec -> GetCode . last_byte = 2 + count; gifdec -> GetCode . curbit = (gifdec -> GetCode . curbit - gifdec -> GetCode . lastbit) + 16; gifdec -> GetCode . lastbit = (2 + count) * 8 ; } ret = 0; for( i = gifdec -> GetCode . curbit, j = 0; j < code_size ; i++, j++ ) ret |= ((gifdec -> GetCode . buf[ i / 8 ] & (1 << (i % 8))) != 0) << j; gifdec -> GetCode . curbit += code_size; return( ret ); } static int LWZReadByte( struct ClassBase *cb, struct GIFAnimInstData *gaid, BOOL flag, int input_code_size ) { struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); /* shortcut */ int code, incode; register int i; if( flag ) { gifdec -> LWZReadByte . set_code_size = input_code_size; gifdec -> LWZReadByte . code_size = gifdec -> LWZReadByte . set_code_size + 1; gifdec -> LWZReadByte . clear_code = 1 << gifdec -> LWZReadByte . set_code_size ; gifdec -> LWZReadByte . end_code = gifdec -> LWZReadByte . clear_code + 1; gifdec -> LWZReadByte . max_code_size = 2 * gifdec -> LWZReadByte . clear_code; gifdec -> LWZReadByte . max_code = gifdec -> LWZReadByte . clear_code + 2; (void)GetCode( cb, gaid, 0, TRUE ); gifdec -> LWZReadByte . fresh = TRUE; /* Fill table with the codes... */ for( i = 0 ; i < (gifdec -> LWZReadByte . clear_code) ; i++ ) { gifdec -> LWZReadByte . table[ 0 ][ i ] = 0; gifdec -> LWZReadByte . table[ 1 ][ i ] = i; } /* ... and clear the remaining part */ for( ; i < (1 << MAX_LWZ_BITS) ; i++ ) { gifdec -> LWZReadByte . table[ 0 ][ i ] = 0; } gifdec -> LWZReadByte . table[ 1 ][ 0 ] = 0; /* Reset stack ptr */ gifdec -> LWZReadByte . sp = gifdec -> LWZReadByte . stack; return( 0 ); } else { if( gifdec -> LWZReadByte . fresh ) { gifdec -> LWZReadByte . fresh = FALSE; do { gifdec -> LWZReadByte . firstcode = gifdec -> LWZReadByte . oldcode = GetCode( cb, gaid, gifdec -> LWZReadByte . code_size, FALSE ); } while( (gifdec -> LWZReadByte . firstcode) == (gifdec -> LWZReadByte . clear_code) ); return( gifdec -> LWZReadByte . firstcode ); } } if( (gifdec -> LWZReadByte . sp) > (gifdec -> LWZReadByte . stack) ) { return( *--gifdec -> LWZReadByte . sp ); } while( (code = GetCode( cb, gaid, gifdec -> LWZReadByte . code_size, FALSE )) >= 0 ) { if( code == gifdec -> LWZReadByte . clear_code ) { for( i = 0 ; i < gifdec -> LWZReadByte . clear_code ; i++ ) { gifdec -> LWZReadByte . table[ 0 ][ i ] = 0; gifdec -> LWZReadByte . table[ 1 ][ i ] = i; } for( ; i < (1 << MAX_LWZ_BITS) ; i++ ) { gifdec -> LWZReadByte . table[ 0 ][ i ] = gifdec -> LWZReadByte . table[ 1 ][ i ] = 0; } gifdec -> LWZReadByte . code_size = gifdec -> LWZReadByte . set_code_size + 1; gifdec -> LWZReadByte . max_code_size = 2 * gifdec -> LWZReadByte . clear_code; gifdec -> LWZReadByte . max_code = gifdec -> LWZReadByte . clear_code + 2; gifdec -> LWZReadByte . sp = gifdec -> LWZReadByte . stack; gifdec -> LWZReadByte . firstcode = gifdec -> LWZReadByte . oldcode = GetCode( cb, gaid, gifdec -> LWZReadByte . code_size, FALSE ); return( gifdec -> LWZReadByte . firstcode ); } else { if( code == gifdec -> LWZReadByte . end_code ) { int count; UBYTE buf[ 260 ]; if( gifdec -> ZeroDataBlock ) return( -2 ); while( (count = GetDataBlock( cb, gaid, buf )) > 0 ) ; if( count != 0 ) error_printf( cb, gaid, "missing EOD in data stream (common occurence)\n" ); return( -2 ); } } incode = code; if( code >= (gifdec -> LWZReadByte . max_code) ) { *gifdec -> LWZReadByte . sp++ = gifdec -> LWZReadByte . firstcode; code = gifdec -> LWZReadByte . oldcode; } while( code >= gifdec -> LWZReadByte . clear_code ) { *gifdec -> LWZReadByte . sp++ = gifdec -> LWZReadByte . table[ 1 ][ code ]; if( code == gifdec -> LWZReadByte . table[ 0 ][ code ] ) error_printf( cb, gaid, "circular table entry BIG ERROR\n" ); code = gifdec -> LWZReadByte . table[ 0 ][ code ]; } *gifdec -> LWZReadByte . sp++ = gifdec -> LWZReadByte . firstcode = gifdec -> LWZReadByte . table[ 1 ][ code ]; if( (code = gifdec -> LWZReadByte . max_code) < (1 << MAX_LWZ_BITS ) ) { gifdec -> LWZReadByte . table[ 0 ][ code ] = gifdec -> LWZReadByte . oldcode; gifdec -> LWZReadByte . table[ 1 ][ code ] = gifdec -> LWZReadByte . firstcode; gifdec -> LWZReadByte . max_code++; if( (gifdec -> LWZReadByte . max_code >= gifdec -> LWZReadByte . max_code_size) && (gifdec -> LWZReadByte . max_code_size < (1 << MAX_LWZ_BITS)) ) { gifdec -> LWZReadByte . max_code_size *= 2; gifdec -> LWZReadByte . code_size++; } } gifdec -> LWZReadByte . oldcode = incode; if( gifdec -> LWZReadByte . sp > gifdec -> LWZReadByte . stack ) { return( *--gifdec -> LWZReadByte . sp ); } } return( code ); } static int ReadImage( struct ClassBase *cb, struct GIFAnimInstData *gaid, UBYTE *image, UWORD imagewidth, UWORD left, UWORD top, UWORD len, UWORD height, BOOL interlace, BOOL ignore, UWORD transparent ) { struct GIFDecoder *gifdec = (&(gaid -> gaid_GIFDec)); /* shortcut */ UBYTE c; /* Initialize the Compression routines */ if( !ReadOK( cb, gifdec, &c, 1 ) ) { return( -1 ); } /* If this is an "uninteresting picture" ignore it. */ if( ignore ) { D( kprintf( cb, gaid, "skipping gif image...\n" ) ); /* Loop until end of raster data */ for( ;; ) { if( !ReadOK( cb, gifdec, &c, 1 ) ) { error_printf( cb, gaid, "EOF / reading block byte count\n" ); return( -1 ); } if( c == 0 ) { D( kprintf( cb, gaid, "gif image done\n" ) ); break; } /* Skip... */ if( Seek( (gifdec -> file), (long)c, OFFSET_CURRENT ) == -1L ) { return( -1 ); } } } else { WORD v; ULONG xpos = 0UL, ypos = 0UL, offset = (top * imagewidth) + left, /* "ypos" position in image (byte offset) */ pass = 0UL; /* interlace pass */ if( LWZReadByte( cb, gaid, TRUE, c ) < 0 ) error_printf( cb, gaid, "error reading image\n" ); D( kprintf( cb, gaid, "reading %lx %ld.%ld / %ld by %ld%s GIF image\n", image, left, top, len, height, interlace ? " interlaced" : "" ) ); while( (v = LWZReadByte( cb, gaid, FALSE, c )) >= 0 ) { /* Pixel transparent ? */ if( (transparent == ~0U) || (transparent != v) ) { /* Store pixel */ image[ offset + xpos ] = v; } xpos++; if( xpos == len ) { xpos = 0UL; if( interlace ) { switch( pass ) { case 0UL: case 1UL: ypos += 8UL; break; case 2UL: ypos += 4UL; break; case 3UL: ypos += 2UL; break; } if( ypos >= height ) { pass++; switch( pass ) { case 1UL: ypos = 4UL; break; case 2UL: ypos = 2UL; break; case 3UL: ypos = 1UL; break; default: goto fini; } } } else { ypos++; } offset = ((ypos + top) * imagewidth) + left; } if( ypos >= height ) break; } fini: if( (v = LWZReadByte( cb, gaid, FALSE, c )) >= 0 ) { /* 0x00-bytes are treated here as padding bytes unless the STRICTSYNTAX option is set... */ if( (v != 0) || (gaid -> gaid_StrictSyntax) ) { verbose_printf( cb, gaid, "too much input data %ld, ignoring extra...\n", (long)v ); } } } return( 0 ); } /* got from my anim.datatype (IFF ANIM) */ static struct FrameNode *GetPrevFrameNode( struct FrameNode *currfn, ULONG interleave ) { struct FrameNode *worknode, *prevnode; /* Get previous frame */ worknode = currfn; while( prevnode = (struct FrameNode *)(worknode -> fn_Node . mln_Pred) ) { if( (interleave-- == 0U) || ((prevnode -> fn_Node . mln_Pred) == NULL) ) { break; } worknode = prevnode; } return( worknode ); } /* WritePixelArray8 replacement by Peter McGavin (p.mcgavin@irl.cri.nz), * slightly adapted to fit here... */ static void WriteDeltaPixelArray8Fast( struct BitMap *dest, UBYTE *source, UBYTE *prev ) { ULONG *plane[ 8 ] = { 0 }; register ULONG *chunky = (ULONG *)source, /* fetch 32 bits per cycle */ *prevchunky = (ULONG *)prev; ULONG numcycles = ((dest -> Rows) * (dest -> BytesPerRow)) / sizeof( ULONG ), i; /* Copy plane ptrs */ for( i = 0UL ; i < (dest -> Depth) ; i++ ) { plane[ i ] = (ULONG *)(dest -> Planes[ i ]); } /* Fill unused planes with plane 0, which will be written last, all previous accesses * will be droped (assumes that a cache hides this "dummy" writes) */ for( i ; i < 8UL ; i++ ) { plane[ i ] = (ULONG *)(dest -> Planes[ 0 ]); } #define merge( a, b, mask, shift ) \ tmp = mask & (a ^ (b >> shift)); \ a ^= tmp; \ b ^= (tmp << shift) /* Check if we have to do the "delta" test */ if( prevchunky ) { /* Process bitmaps */ for( i = 0UL ; i < numcycles ; i++ ) { register ULONG b0, b1, b2, b3, b4, b5, b6, b7, tmp; /* process 32 pixels */ b0 = *chunky++; b4 = *chunky++; b1 = *chunky++; b5 = *chunky++; b2 = *chunky++; b6 = *chunky++; b3 = *chunky++; b7 = *chunky++; /* I use the '+' here to avoid that the compiler skips an expression. * WARNING: The code assumes that the code is executed in the sequence as it occurs here */ if( (b0 != *prevchunky++) + (b4 != *prevchunky++) + (b1 != *prevchunky++) + (b5 != *prevchunky++) + (b2 != *prevchunky++) + (b6 != *prevchunky++) + (b3 != *prevchunky++) + (b7 != *prevchunky++) ) { merge( b0, b2, 0x0000ffff, 16 ); merge( b1, b3, 0x0000ffff, 16 ); merge( b4, b6, 0x0000ffff, 16 ); merge( b5, b7, 0x0000ffff, 16 ); merge( b0, b1, 0x00ff00ff, 8 ); merge( b2, b3, 0x00ff00ff, 8 ); merge( b4, b5, 0x00ff00ff, 8 ); merge( b6, b7, 0x00ff00ff, 8 ); merge( b0, b4, 0x0f0f0f0f, 4 ); merge( b1, b5, 0x0f0f0f0f, 4 ); merge( b2, b6, 0x0f0f0f0f, 4 ); merge( b3, b7, 0x0f0f0f0f, 4 ); merge( b0, b2, 0x33333333, 2 ); merge( b1, b3, 0x33333333, 2 ); merge( b4, b6, 0x33333333, 2 ); merge( b5, b7, 0x33333333, 2 ); merge( b0, b1, 0x55555555, 1 ); merge( b2, b3, 0x55555555, 1 ); merge( b4, b5, 0x55555555, 1 ); merge( b6, b7, 0x55555555, 1 ); *plane[ 7 ]++ = b0; *plane[ 6 ]++ = b1; *plane[ 5 ]++ = b2; *plane[ 4 ]++ = b3; *plane[ 3 ]++ = b4; *plane[ 2 ]++ = b5; *plane[ 1 ]++ = b6; *plane[ 0 ]++ = b7; } else { plane[ 7 ]++; plane[ 6 ]++; plane[ 5 ]++; plane[ 4 ]++; plane[ 3 ]++; plane[ 2 ]++; plane[ 1 ]++; plane[ 0 ]++; } } } else { /* Process bitmaps */ for( i = 0UL ; i < numcycles ; i++ ) { register ULONG b0, b1, b2, b3, b4, b5, b6, b7, tmp; /* process 32 pixels */ b0 = *chunky++; b4 = *chunky++; b1 = *chunky++; b5 = *chunky++; b2 = *chunky++; b6 = *chunky++; b3 = *chunky++; b7 = *chunky++; merge( b0, b2, 0x0000ffff, 16 ); merge( b1, b3, 0x0000ffff, 16 ); merge( b4, b6, 0x0000ffff, 16 ); merge( b5, b7, 0x0000ffff, 16 ); merge( b0, b1, 0x00ff00ff, 8 ); merge( b2, b3, 0x00ff00ff, 8 ); merge( b4, b5, 0x00ff00ff, 8 ); merge( b6, b7, 0x00ff00ff, 8 ); merge( b0, b4, 0x0f0f0f0f, 4 ); merge( b1, b5, 0x0f0f0f0f, 4 ); merge( b2, b6, 0x0f0f0f0f, 4 ); merge( b3, b7, 0x0f0f0f0f, 4 ); merge( b0, b2, 0x33333333, 2 ); merge( b1, b3, 0x33333333, 2 ); merge( b4, b6, 0x33333333, 2 ); merge( b5, b7, 0x33333333, 2 ); merge( b0, b1, 0x55555555, 1 ); merge( b2, b3, 0x55555555, 1 ); merge( b4, b5, 0x55555555, 1 ); merge( b6, b7, 0x55555555, 1 ); *plane[ 7 ]++ = b0; *plane[ 6 ]++ = b1; *plane[ 5 ]++ = b2; *plane[ 4 ]++ = b3; *plane[ 3 ]++ = b4; *plane[ 2 ]++ = b5; *plane[ 1 ]++ = b6; *plane[ 0 ]++ = b7; } } } static int getbase2( int x ) { int i = 0, j = 1; while( x > j ) { j *= 2; i++; } return( i ); } /* Read and test */ static BOOL ReadOK( struct ClassBase *cb, struct GIFDecoder *gifdec, void *buffer, ULONG len ) { if( (gifdec -> which_fh) == WHICHFH_FILE ) { return( (BOOL)(Read( (gifdec -> file), buffer, len ) == len) ); } else { /* Check if the request fit in out buffer... */ if( (((gifdec -> buffer) - (gifdec -> file_buffer)) + len) <= (gifdec -> buffersize) ) { CopyMem( (gifdec -> buffer), buffer, len ); gifdec -> buffer += len; return( TRUE ); } } return( FALSE ); }