Here is a version with some improvements :
Quote:
; + added Catch-Support
; + added reading of complete giffile into memory, this should be faster

; + optimized Variabletypes for better support 64-Bit Programs
; + changed Syntax of GIF_LoadFrames() to:
; GIF_LoadFrames(Array GIF_Frames.GIF_Frame(1), filename.s = "", *memory = 0, memsize = 0)
[GIFanimation.pbi]
Code:
; Original PB code by "hagibaba" (Purebasic.fr forums) based on "loadgif.c" for ImageShop32 by John Findlay
; Gif Anim support by localmotion34 (Purebasic.fr forums)
; Updated & Extended by Dean Williams - resplace.net
; APIs free, alpha channel support and bug fixes by Niffo (Purebasic.fr forums)
; #######################################
; enhanced and optimized by Thomas <ts-soft> Schulz (www.realsource.de)
; + added Catch-Support
; + added reading of complete giffile into memory, this should be faster ;-)
; + optimized Variabletypes for better support 64-Bit Programs
; + changed Syntax of GIF_LoadFrames() to:
; GIF_LoadFrames(Array GIF_Frames.GIF_Frame(1), filename.s = "", *memory = 0, memsize = 0)
; changed MessageRequester to Debug.
; #######################################
; Please help development and report any problems or improvements/bug fixes you may have on
; if we all work together we can have some really nice GIF support in PureBasic!
; http://www.purebasic.fr/english/viewtopic.php?f=12&t=27575
;{ - Structures
CompilerIf Defined(BITMAPINFOHEADER, #PB_Structure)
CompilerElse
Structure BITMAPINFOHEADER
biSize.l
biWidth.l
biHeight.l
biPlanes.w
biBitCount.w
biCompression.l
biSizeImage.l
biXPelsPerMeter.l
biYPelsPerMeter.l
biClrUsed.l
biClrImportant.l
EndStructure
#BI_RGB = 0
Structure RGBQUAD
rgbBlue.a
rgbGreen.a
rgbRed.a
rgbReserved.a
EndStructure
CompilerEndIf
Structure GIF_Frame
Image.i
DelayTime.w
EndStructure
Structure GIFHEADER ;Header
ghSig.b[6] ;Signature & Version
ghWidth.w ;Logical Screen Width
ghHeight.w ;Logical Screen Height
ghPkFields.b ;Global Color Table Flag
ghBkColIndex.b ;Background Color Index
ghAspRatio.b ;Pixel Aspect Ratio
EndStructure
Structure GIFIMAGE ;Image Descriptor
imSep.b ;Image Separator
imLeft.w ;Image Left Position
imTop.w ;Image Top Position
imWidth.w ;Image Width
imHeight.w ;Image Height
impkFields.b ;Local Color Table Flag
EndStructure
Structure GIFCLASS ;This is instead of using globals
*lpBytes.Byte ;Pointer to next byte in block
Pass.l ;First pass for interlaced images in OutLineGIF()
Line.l ;Offset for addressing the bits in OutLineGIF()
lpBits.l ;Scanline for bits
pitch.l ;Bytes are rounded up for image lines
CurrCodeSize.l ;The current code size
BitsLeft.l ;Used in NextCodeGIF()
BytesLeft.l ;Used in NextCodeGIF()
CurrByte.l ;Current byte
bUseGlobalColMap.b ;Is the color table global
GlobColRes.l ;Color Resolution, bits '6' '5' '4'
bImInterLace.b ;Is the image interlaced
ImgColRes.l ;Color Resolution
EndStructure
;}
Procedure GIF_OutLine(lpPixels.l,LineLen.l,height.l,*cl.GIFCLASS)
;Outputs the pixel color index data to the DIB
;lpPixels -> Memory block that holds the color index value
;LineLen -> Length of the line of pixels
;Height -> im\imHeight
;Gif images are 2, 16 or 256 colors, poking the values into memory
;requires a different method for each case. If gif is interlaced,
;that is dealt with here.
Protected ib.l,pixel.l,byte.l,BitCnt.l,CntBk.l,ColRes.l,Bits.l
Bits=*cl\lpBits-(*cl\Line * *cl\pitch) ;Pointer to bits
If *cl\bUseGlobalColMap
ColRes=*cl\GlobColRes
Else
ColRes=*cl\ImgColRes
EndIf
Select ColRes
Case 1
byte=0
For pixel=0 To LineLen-1 Step 8
ib=0
CntBk=7
For BitCnt=0 To 8-1
If PeekB(lpPixels+BitCnt+pixel)
ib=ib | (1 << CntBk)
EndIf
CntBk-1
Next
PokeB(Bits+byte,ib)
byte+1
Next
Case 4
byte=0
For pixel=0 To LineLen-1 Step 2
ib=((PeekB(lpPixels+pixel) & 255) << 4)
ib | (PeekB(lpPixels+pixel+1) & 255)
PokeB(Bits+byte,ib)
byte+1
Next
Case 8
For pixel=0 To LineLen-1
ib=PeekB(lpPixels+pixel) & 255
PokeB(Bits+pixel,ib)
Next
EndSelect
If *cl\bImInterLace ;Set Line for different passes when Interlaced
Select *cl\Pass
Case 0 ;Pass 1
If *cl\Line<height-8
*cl\Line+8
Else
*cl\Line=4 : *cl\Pass+1 ;Set Line for second pass
EndIf
Case 1 ;Pass 2
If *cl\Line<height-8
*cl\Line+8
Else
*cl\Line=2 : *cl\Pass+1 ;Set Line for third pass
EndIf
Case 2 ;Pass 3
If *cl\Line<height-4
*cl\Line+4
Else
*cl\Line=1 : *cl\Pass+1 ;Set Line for fourth pass
EndIf
Case 3 ;Pass 4
If *cl\Line<height-2
*cl\Line+2
EndIf
EndSelect
Else ;When not Interlaced increment Line
*cl\Line+1
EndIf
EndProcedure
Procedure.l GIF_NextCode(*mem, mempos, *pos.long, Array CharBuff.b(1),Array CodeMask.l(1),*cl.GIFCLASS)
;Reads the next code from the data stream
;Returns the LZW CODE or ERROR
Protected count.l,Char.l,ret.l
If *cl\BitsLeft=0 ;Any bits left in byte?
If *cl\BytesLeft<=0 ;If not get another block
*cl\lpBytes=@CharBuff(0) ;Set byte pointer
*cl\BytesLeft = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
If *cl\BytesLeft<0
*pos\l = mempos
ProcedureReturn *cl\BytesLeft ;Return if error
ElseIf *cl\BytesLeft
For count=0 To *cl\BytesLeft-1
Char = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
*pos\l = mempos
If Char<0 : ProcedureReturn Char : EndIf
CharBuff(count)=Char ;Fill the char buffer with the new block
Next
EndIf
EndIf
*cl\CurrByte=*cl\lpBytes\b & 255 ;Get a byte
*cl\lpBytes+1 ;Increment index pointer
*cl\BitsLeft=8 ;Set bits left in the byte
*cl\BytesLeft-1 ;Decrement the bytes left counter
EndIf
;Shift off any previously used bits
ret=*cl\CurrByte >> (8-*cl\BitsLeft)
While *cl\CurrCodeSize>*cl\BitsLeft
If *cl\BytesLeft<=0
;Out of bytes in current block
*cl\lpBytes=@CharBuff(0) ;Set byte pointer
*cl\BytesLeft = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
If *cl\BytesLeft<0
*pos\l = mempos
ProcedureReturn *cl\BytesLeft ;Return if error
ElseIf *cl\BytesLeft
For count=0 To *cl\BytesLeft-1
Char = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
*pos\l = mempos
If Char<0 : ProcedureReturn Char : EndIf
CharBuff(count)=Char ;Fill the char buffer with the current block
Next
EndIf
EndIf
*cl\CurrByte=*cl\lpBytes\b & 255 ;Get a byte
*cl\lpBytes+1 ;Increment index pointer
ret | (*cl\CurrByte << *cl\BitsLeft) ;Add remaining bits to return
*cl\BitsLeft+8 ;Set bit counter
*cl\BytesLeft-1 ;Decrement bytesleft counter
Wend
*cl\BitsLeft-*cl\CurrCodeSize ;Subtract the code size from bitsleft
ret & CodeMask(*cl\CurrCodeSize) ;Mask off the right number of bits
*pos\l = mempos
ProcedureReturn ret
EndProcedure
Procedure GIF_CreateDIImage(*dib.BITMAPINFOHEADER, TransColIndex.w)
Protected *Bits = *dib+*dib\biSize+(*dib\biClrUsed*4)
Protected Image = CreateImage(#PB_Any, *dib\biWidth, *dib\biHeight, 32)
Protected.l X, Y, RGBA, Col
Protected *Pal = *dib + *dib\biSize
Protected.a ColInd, Alpha
Protected.l dibPitch = *dib\biSizeImage/*dib\biHeight
StartDrawing(ImageOutput(Image))
DrawingMode(#PB_2DDrawing_AllChannels)
; Define *BufAddr = DrawingBuffer()
; Define.l BufPitch = DrawingBufferPitch()
For Y = 0 To *dib\biHeight - 1
For X = 0 To *dib\biWidth - 1
Select *dib\biBitCount
Case 8
ColInd = PeekA(*Bits + Y*dibPitch+X)
Case 4
;If X % 2
; ColInd = PeekA(*Bits + Y*dibPitch+X) & $F
;Else
; ColInd = PeekA(*Bits + Y*dibPitch+X) >> 4
;EndIf
ColInd = PeekA(*Bits + Y*dibPitch+X/2) >> (4*(1-X%2)) & $F
EndSelect
If ColInd = TransColIndex : Alpha = 0 : Else : Alpha = 255 : EndIf
Col = PeekL(*Pal+ColInd*4)
; Plot
RGBA = RGBA(Blue(Col), Green(Col), Red(Col), Alpha)
Plot(X, *dib\biHeight-1-Y, RGBA)
; ; Direct Buffer Write (not faster !?)
; If DrawingBufferPixelFormat() & #PB_PixelFormat_32Bits_RGB
; RGBA = RGBA(Blue(Col), Green(Col), Red(Col), Alpha)
; ElseIf DrawingBufferPixelFormat() & #PB_PixelFormat_32Bits_BGR
; RGBA = RGBA(Red(Col), Green(Col), Blue(Col), Alpha)
; EndIf
; If DrawingBufferPixelFormat() & #PB_PixelFormat_ReversedY
; PokeL(*BufAddr + (Y*BufPitch+X*4), RGBA)
; Else
; PokeL(*BufAddr + ((*dib\biHeight-1-Y)*BufPitch+X*4), RGBA)
; EndIf
Next X
Next Y
StopDrawing()
ProcedureReturn Image
EndProcedure
Procedure.i GIF_LoadFrames(Array GIF_Frames.GIF_Frame(1), filename.s = "", *memory = 0, memsize = 0)
;From "loadgif.c" for ImageShop32 by John Findlay
;Loads LZW Graphics Interchange Format files
;Uses NextCodeGIF() and OutLineGIF()
Protected Dim stack.b(4096) ;Stack for storing pixels
Protected Dim suffix.b(4096) ;Suffix table, max number of LZW codes
Protected Dim prefix.l(4096) ;Prefix linked list (these are longs)
Protected Dim CharBuff.b(279) ;Current block
Protected Dim GlobalCols.l(256) ;Global colors of gif
Protected Dim localCols.l(256) ;Local image colors of gif
Protected Dim CodeMask.l(16) ;Masks for LZW compression algorithm
Protected gh.GIFHEADER
Protected im.GIFIMAGE
Protected cl.GIFCLASS
Protected bi.BITMAPINFOHEADER
Protected *pal.RGBQUAD
Protected *lpSP.Byte ;Pointer to stack
Protected *lpBuffPtr.Byte ;Pointer to buffer
Protected bGlobColsSorted.b ;Sort Flag bit '3' (this is unused)
Protected file.l,sig.s,PkFields.l,bGlobColTable.b,GlobColBytes.l
Protected GlobColors.l,count.l,Red.l,Green.l,Blue.l
Protected width.l,height.l,impkFields.l,bImColsSorted.b
Protected bImColTable.b,ImgColBytes.l,LZWCodeSize.l,TopSlot.l
Protected ClearCode.l,ImgColors.l,EndingCode.l,NewCodes.l,Slot.l
Protected lpBUFF.l,TempOldCode.l,OldCode.l,BufCnt.l,bitcount.l
Protected ncolors.l,Len.l,hDIB.l,cc.l,code.l
Protected *dib.BITMAPINFOHEADER
CodeMask( 0)=$0000 : CodeMask( 1)=$0001
CodeMask( 2)=$0003 : CodeMask( 3)=$0007
CodeMask( 4)=$000F : CodeMask( 5)=$001F
CodeMask( 6)=$003F : CodeMask( 7)=$007F
CodeMask( 8)=$00FF : CodeMask( 9)=$01FF
CodeMask(10)=$03FF : CodeMask(11)=$07FF
CodeMask(12)=$0FFF : CodeMask(13)=$1FFF
CodeMask(14)=$3FFF : CodeMask(15)=$7FFF
Protected mempos, newpos, *mem
If filename <> ""
;Open the file
file=ReadFile(#PB_Any,filename)
If file=0
Debug "GIF Load Error! Could not open the GIF image file for reading."
ProcedureReturn #False
EndIf
;Read the file header and logical screen descriptor
memsize = Lof(file)
*mem = AllocateMemory(memsize)
If *mem = 0
Debug "GIF Load Error! Could not allocate Memory for GIF image."
ProcedureReturn #False
EndIf
ReadData(file, *mem, memsize)
CloseFile(file)
ElseIf *memory
*mem = AllocateMemory(memsize)
If *mem
CopyMemory(*memory, *mem, memsize)
EndIf
EndIf
If *mem = 0
Debug "GIF Load Error! Could not find Memory for GIF image."
ProcedureReturn #False
EndIf
CopyMemory(*mem, gh, SizeOf(gh))
mempos + SizeOf(gh)
sig=PeekS(@gh\ghSig,6,#PB_Ascii) ;Get the header version string
If sig<>"GIF89a" And sig<>"GIF87a"
FreeMemory(*mem)
Debug "GIF Load Error! File was not a valid GIF image file"
ProcedureReturn #False ;NOT_VALID
EndIf
Protected.l realwidth=gh\ghWidth
Protected.l realheight=gh\ghHeight
;Store gh\ghPkFields for bit manipulation
PkFields=gh\ghPkFields & 255
;Global Color Table Flag bit '7'
bGlobColTable=(PkFields & (1 << 7)) >> 7
If bGlobColTable
cl\bUseGlobalColMap=#True
GlobColBytes=3*(1 << ((PkFields & $07)+1)) ;Table size in bytes
GlobColors=GlobColBytes/3 ;Number of colors
;Some gif encoders do not follow the gif spec very well,
;so make cl\GlobColRes from GlobColors.
;Also gif's are used on different platforms, which do
;have different bits per pixel. i.e. 32 colors is 5 bits/pixel.
If GlobColors<=2
cl\GlobColRes=1
ElseIf GlobColors<=16
cl\GlobColRes=4
Else
cl\GlobColRes=8
EndIf
For count=0 To GlobColors-1 ;Get the global screen colors
Red = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Green = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Blue = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
GlobalCols(count)=RGB(Red,Green,Blue)
Next
EndIf
Protected.w TransColorIndex = -1
count=0
While count<>$2C ;Search for im\imSep
count = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
If count = $F9
mempos + SizeOf(Byte)
Protected.b tflag = PeekB(*mem + mempos) & 1 : mempos + SizeOf(Byte)
Protected.w delaytime = PeekW(*mem + mempos) : mempos + SizeOf(Word)
Protected.a transparent = PeekB(*mem + mempos) : mempos + SizeOf(Byte)
If tflag : TransColorIndex = transparent : EndIf
EndIf
Wend
mempos - SizeOf(byte);Seek to im\imSep
CopyMemory(*mem + mempos, im, SizeOf(im)) ;Read the image descriptor
mempos + SizeOf(im)
;Store im\imPkFields for bit manipulation
impkFields=im\impkFields & 255
;Is the image interlaced
cl\bImInterLace=(impkFields & (1 << 6)) >> 6
;Is the local color table sorted
bImColsSorted=(impkFields & (1 << 5)) >> 5
;Is there a local color table
bImColTable=(impkFields & (1 << 7)) >> 7
If bImColTable
cl\bUseGlobalColMap=#False
ImgColBytes=3*(1 << ((impkFields & $07)+1)) ;Table size in bytes
ImgColors=ImgColBytes/3 ;Number of colors
If ImgColors<=2 ;Make sure image bit depth is 1, 4 or 8
cl\ImgColRes=1
ElseIf ImgColors<=16
cl\ImgColRes=4
Else
cl\ImgColRes=8
EndIf
For count=0 To ImgColors-1 ;Get the local image colors
Red = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Green = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Blue = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
localCols(count)=RGB(Red,Green,Blue)
Next
;transcolor=LocalCols(TByte)
Else ;No local color table
If cl\bUseGlobalColMap=#False ;No global color table
FreeMemory(*mem)
Debug "GIF Load Error! The GIF image does not contain a valid color table."
ProcedureReturn #False ;NO_COLORTABLE
EndIf
EndIf
width=im\imWidth & $FFFF ;Image width
height=im\imHeight & $FFFF ;Image height
;Get the first byte of the new block of image data.
;Should be the bit size
LZWCodeSize = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
;Bit size is normally the same as the color resolution.
;i.e. 8 for 256 colors
If LZWCodeSize<2 Or LZWCodeSize>8
FreeMemory(*mem)
Debug "GIF Load Error! LZW code size is not valid!"
ProcedureReturn #False ;BAD_CODE_SIZE
EndIf
;Initialise the variables for the decoder for reading a new image.
cl\CurrCodeSize=LZWCodeSize+1
TopSlot=1 << cl\CurrCodeSize ;Highest code for current size
ClearCode=1 << LZWCodeSize ;Value for a clear code
EndingCode=ClearCode+1 ;Value for an ending code
NewCodes=ClearCode+2 ;First available code
Slot=NewCodes ;Last read code
cl\BitsLeft=0
cl\BytesLeft=0
;Just in case...
TempOldCode=0 : OldCode=0
;Allocate space for the decode buffer
lpBUFF=AllocateMemory(width+8) ;+8 just in case
;Set up the stack pointer, decode buffer pointer and line counter
*lpSP=@stack(0)
*lpBuffPtr=lpBUFF
BufCnt=width ;Count for pixel line length
;Start creating the DIB
If cl\bUseGlobalColMap ;Global color table
bitcount=cl\GlobColRes
Else ;Local color table
bitcount=cl\ImgColRes
EndIf
bi\biSize=SizeOf(bi)
bi\biWidth=width
bi\biHeight=height
bi\biPlanes=1
bi\biBitCount=bitcount ;BitCount will be 1, 4 or 8
bi\biCompression=#BI_RGB
bi\biSizeImage=0
bi\biXPelsPerMeter=0
bi\biYPelsPerMeter=0
If cl\bUseGlobalColMap ;Global color table
bi\biClrUsed=GlobColors
Else ;Local color table
bi\biClrUsed=ImgColors
EndIf
bi\biClrImportant=0
;With the BITMAPINFO format headers, the size of the palette is
;in biClrUsed, whereas in the BITMAPCORE - style headers, it is
;dependent on the Bits per pixel (2 to the power of bitsperpixel).
If bi\biClrUsed<>0
ncolors=bi\biClrUsed
Else ;We don't have an optimal palette
ncolors=1 << bi\biBitCount
EndIf
cl\pitch=(((bitcount*width)+31) >> 5) << 2 ;Bytes per line
Len=bi\biSize+(ncolors*4)+(cl\pitch*height) ;Size of DIB
bi\biSizeImage=cl\pitch*height ;Fill in biSizeImage
;Allocate memory block to store our DIB
hDIB=AllocateMemory(Len)
If hDIB=0
FreeMemory(lpBUFF)
FreeMemory(*mem)
Debug "GIF Load Error! Memory allocation failed!"
ProcedureReturn #False ;NO_DIB
EndIf
;Fill first part of DIB with the BITMAPINFOHEADER
CopyMemory(bi,hDIB,SizeOf(bi))
;Set the colors in the DIB (or masks for the new DIB formats)
*pal=hDIB+SizeOf(bi)
If cl\bUseGlobalColMap
For count=0 To bi\biClrUsed-1
*pal\rgbBlue=Blue(GlobalCols(count))
*pal\rgbGreen=Green(GlobalCols(count))
*pal\rgbRed=Red(GlobalCols(count))
*pal+4
Next
Else
For count=0 To bi\biClrUsed-1
*pal\rgbBlue=Blue(localCols(count))
*pal\rgbGreen=Green(localCols(count))
*pal\rgbRed=Red(localCols(count))
*pal+4
Next
EndIf
cl\Line=0 ;Set address offset for OutLineGIF()
cl\Pass=0 ;For interlaced images in OutLineGIF()
;Image data bits of DIB
cl\lpBits=hDIB+bi\biSize+(ncolors*4)+(cl\pitch*(height-1))
;This is the main loop. For each code we get we pass through the
;linked list of prefix codes, pushing the corresponding "character"
;for each code onto the stack. When the list reaches a single
;"character" we push that on the stack too, and then start
;unstacking each character for output in the correct order.
;Special handling is included for the clear code, and the whole
;thing ends when we get an ending code.
While cc<>EndingCode
cc=GIF_NextCode(*mem, mempos, @newpos, CharBuff(),CodeMask(),cl)
mempos = newpos
If cc<0 ;If a file error, return without completing the decode
FreeMemory(lpBUFF)
FreeMemory(*mem)
Debug "GIF Load Error! LZW code size is Not valid!"
ProcedureReturn #False ;FILE_ERROR
EndIf
;If the code is a clear code, re-initialise all necessary items.
If cc=ClearCode
cl\CurrCodeSize=LZWCodeSize+1
Slot=NewCodes
TopSlot=1 << cl\CurrCodeSize
;Continue reading codes until we get a non-clear code
;(another unlikely, but possible case...)
While cc=ClearCode
cc=GIF_NextCode(*mem, mempos, @newpos,CharBuff(),CodeMask(),cl)
mempos = newpos
Wend
;If we get an ending code immediately after a clear code
;(yet another unlikely case), then break out of the loop.
If cc=EndingCode
Break ;end loop
EndIf
;Finally, if the code is beyond the range of already set codes,
;(This one had better not happen, I have no idea what will
;result from this, but I doubt it will look good)
;then set it to color zero.
If cc>=Slot
cc=0
EndIf
OldCode=cc
TempOldCode=OldCode
;And let us not forget to put the char into the buffer, and if,
;on the off chance, we were exactly one pixel from the end of
;the line, we have to send the buffer to the OutLineGIF() routine
*lpBuffPtr\b=cc
*lpBuffPtr+1
BufCnt-1
If BufCnt=0
GIF_OutLine(lpBUFF,width,height,cl)
*lpBuffPtr=lpBUFF
BufCnt=width
EndIf
Else
;In this case, it's not a clear code or an ending code, so it
;must be a code code. So we can now decode the code into a
;stack of character codes (Clear as mud, right?).
code=cc
If code=Slot
code=TempOldCode
*lpSP\b=OldCode
*lpSP+1
EndIf
;Here we scan back along the linked list of prefixes, pushing
;helpless characters (i.e. suffixes) onto the stack as we do so.
While code>=NewCodes
*lpSP\b=suffix(code)
*lpSP+1
code=prefix(code)
Wend
;Push the last character on the stack, and set up the new
;prefix and suffix, and if the required slot number is greater
;than that allowed by the current bit size, increase the bit
;size. (Note - if we are all full, we *don't* save the new
;suffix and prefix. I'm not certain if this is correct,
;it might be more proper to overwrite the last code.
*lpSP\b=code
*lpSP+1
If Slot<TopSlot
OldCode=code
suffix(Slot)=OldCode
prefix(Slot)=TempOldCode
Slot+1
TempOldCode=cc
EndIf
If Slot>=TopSlot
If cl\CurrCodeSize<12
TopSlot=TopSlot << 1
cl\CurrCodeSize+1
EndIf
EndIf
;Now that we've pushed the decoded string (in reverse order)
;onto the stack, lets pop it off and put it into our decode
;buffer, and when the decode buffer is full, write another line.
While *lpSP>@stack(0)
*lpSP-1
*lpBuffPtr\b=*lpSP\b
*lpBuffPtr+1
BufCnt-1
If BufCnt=0
GIF_OutLine(lpBUFF,width,height,cl)
*lpBuffPtr=lpBUFF
BufCnt=width
EndIf
Wend
EndIf
Wend
If BufCnt<>width ;If there are any left, output the bytes
GIF_OutLine(lpBUFF,width-BufCnt-1,height,cl)
EndIf
*dib=hDIB
If *dib=0 ;Avoid errors
ProcedureReturn #False
EndIf
Protected.i Bits=*dib+*dib\biSize+(*dib\biClrUsed*4) ;Pointer to bits
;Create the DDB bitmap
Protected.i hImage=GIF_CreateDIImage(*dib, TransColorIndex)
Protected.i pbimage=CreateImage(#PB_Any,realwidth,realheight, 32 | #PB_Image_Transparent) ; Create initial "screen"
StartDrawing(ImageOutput(pbimage))
DrawingMode(#PB_2DDrawing_AlphaBlend)
;Box(0,0,realwidth,realheight,$FFFFFF)
DrawImage(ImageID(hImage),im\imLeft,im\imTop,im\imWidth,im\imHeight)
StopDrawing()
FreeImage(hImage)
FreeMemory(hDIB)
;imageArray(0)=ImageID(pbimage)
GIF_Frames(0)\Image = pbimage
GIF_Frames(0)\DelayTime = delaytime
Protected.l numberimages=1
;===========================
;- continue to other frames
;===========================
; Read through the various image blocks
Protected NotatEnd=1
While NotatEnd=1
TransColorIndex = -1
Protected.i n
While n<>$2C
n=PeekA(*mem + mempos) : mempos + SizeOf(Byte)
If n=$3B
NotatEnd=0
FreeMemory(*mem)
FreeMemory(lpBUFF)
ProcedureReturn numberimages
ElseIf n=$F9
;Graphics control extension
n=PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Protected.l Size = n
n=PeekA(*mem + mempos) : mempos + SizeOf(Byte)
;Define.b packedfields = n &$FF
Protected.l disposalmethod = (n & %00011100) >>2
tflag = n & %00000001
delaytime = PeekW(*mem + mempos) : mempos + SizeOf(Word)
transparent = PeekB(*mem + mempos) : mempos + SizeOf(Byte)
If tflag : TransColorIndex = transparent : EndIf
ElseIf n=$FF
;application extension
ElseIf n=$FE
;comment extention
n=PeekA(*mem + mempos) : mempos + SizeOf(Byte)
mempos + n
ElseIf n= $01
;"plain text extention"
;Debug "text"
; n=ReadByte(file) & 255
;FileSeek(file,Loc(file)+n& $FF)
ElseIf n =$21
;"A Extension_block
EndIf
Wend
n=0
; done with reading the image blocks for this frame
mempos - SizeOf(Byte)
count=0
While count<>$2C ;Search for im\imSep
count = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Wend
mempos - SizeOf(Byte) ;Seek to im\imSep
CopyMemory(*mem + mempos, im, SizeOf(im)) ;Read the image descriptor
mempos + SizeOf(im)
;Store im\imPkFields for bit manipulation
impkFields=im\impkFields & 255
;Is the image interlaced
cl\bImInterLace=(impkFields & (1 << 6)) >> 6
;Is the local color table sorted
bImColsSorted=(impkFields & (1 << 5)) >> 5
;Is there a local color table
bImColTable=(impkFields & (1 << 7)) >> 7
If bImColTable
cl\bUseGlobalColMap=#False
ImgColBytes=3*(1 << ((impkFields & $07)+1)) ;Table size in bytes
ImgColors=ImgColBytes/3 ;Number of colors
If ImgColors<=2 ;Make sure image bit depth is 1, 4 or 8
cl\ImgColRes=1
ElseIf ImgColors<=16
cl\ImgColRes=4
Else
cl\ImgColRes=8
EndIf
For count=0 To ImgColors-1 ;Get the local image colors
Red = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Green = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
Blue = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
localCols(count)=RGB(Red,Green,Blue)
Next
;loctranscolor=localCols(transparent& $FF)
;transcolor=localCols(transparent& $FF)
Else ;No local color table
If cl\bUseGlobalColMap=#False ;No global color table
FreeMemory(*mem)
Debug "GIF Load Error! The GIF image does not contain a valid color table."
ProcedureReturn #False ;NO_COLORTABLE
EndIf
;transcolor=GlobalCols(transparent& $FF)
EndIf
width=im\imWidth & $FFFF ;Image width
height=im\imHeight & $FFFF ;Image height
;Get the first byte of the new block of image data.
;Should be the bit size
LZWCodeSize = PeekA(*mem + mempos) : mempos + SizeOf(Byte)
;Bit size is normally the same as the color resolution.
;i.e. 8 for 256 colors
If LZWCodeSize<2 Or LZWCodeSize>8
FreeMemory(*mem)
Debug "GIF Load Error! LZW code size is Not valid!"
ProcedureReturn #False ;BAD_CODE_SIZE
EndIf
;Initialise the variables for the decoder for reading a new image.
cl\CurrCodeSize=LZWCodeSize+1
TopSlot=1 << cl\CurrCodeSize ;Highest code for current size
ClearCode=1 << LZWCodeSize ;Value for a clear code
EndingCode=ClearCode+1 ;Value for an ending code
NewCodes=ClearCode+2 ;First available code
Slot=NewCodes ;Last read code
cl\BitsLeft=0
cl\BytesLeft=0
;Just in case...
TempOldCode=0 : OldCode=0
;Allocate space for the decode buffer
lpBUFF=AllocateMemory(width+8) ;+8 just in case
;Set up the stack pointer, decode buffer pointer and line counter
*lpSP=@stack(0)
*lpBuffPtr=lpBUFF
BufCnt=width ;Count for pixel line length
;Start creating the DIB
If cl\bUseGlobalColMap ;Global color table
bitcount=cl\GlobColRes
Else ;Local color table
bitcount=cl\ImgColRes
EndIf
bi\biSize=SizeOf(bi)
bi\biWidth=width
bi\biHeight=height
bi\biPlanes=1
bi\biBitCount=bitcount ;BitCount will be 1, 4 or 8
bi\biCompression=#BI_RGB
bi\biSizeImage=0
bi\biXPelsPerMeter=0
bi\biYPelsPerMeter=0
If cl\bUseGlobalColMap ;Global color table
bi\biClrUsed=GlobColors
Else ;Local color table
bi\biClrUsed=ImgColors
EndIf
bi\biClrImportant=0
;With the BITMAPINFO format headers, the size of the palette is
;in biClrUsed, whereas in the BITMAPCORE - style headers, it is
;dependent on the Bits per pixel (2 to the power of bitsperpixel).
If bi\biClrUsed<>0
ncolors=bi\biClrUsed
Else ;We don't have an optimal palette
ncolors=1 << bi\biBitCount
EndIf
cl\pitch=(((bitcount*width)+31) >> 5) << 2 ;Bytes per line
Len=bi\biSize+(ncolors*4)+(cl\pitch*height) ;Size of DIB
bi\biSizeImage=cl\pitch*height ;Fill in biSizeImage
;Allocate memory block to store our DIB
hDIB=AllocateMemory(Len)
If hDIB=0
FreeMemory(lpBUFF)
FreeMemory(*mem)
Debug "GIF Load Error! Memory allocation failed!"
ProcedureReturn #False ;NO_DIB
EndIf
;Fill first part of DIB with the BITMAPINFOHEADER
CopyMemory(bi,hDIB,SizeOf(bi))
;Set the colors in the DIB (or masks for the new DIB formats)
*pal=hDIB+SizeOf(bi)
If cl\bUseGlobalColMap
For count=0 To bi\biClrUsed-1
*pal\rgbBlue=Blue(GlobalCols(count))
*pal\rgbGreen=Green(GlobalCols(count))
*pal\rgbRed=Red(GlobalCols(count))
*pal+4
Next
Else
For count=0 To bi\biClrUsed-1
*pal\rgbBlue=Blue(localCols(count))
*pal\rgbGreen=Green(localCols(count))
*pal\rgbRed=Red(localCols(count))
*pal+4
Next
EndIf
cl\Line=0 ;Set address offset for OutLineGIF()
cl\Pass=0 ;For interlaced images in OutLineGIF()
;Image data bits of DIB
cl\lpBits=hDIB+bi\biSize+(ncolors*4)+(cl\pitch*(height-1))
;This is the main loop. For each code we get we pass through the
;linked list of prefix codes, pushing the corresponding "character"
;for each code onto the stack. When the list reaches a single
;"character" we push that on the stack too, and then start
;unstacking each character for output in the correct order.
;Special handling is included for the clear code, and the whole
;thing ends when we get an ending code.
cc=0
While cc<>EndingCode
cc=GIF_NextCode(*mem, mempos, @newpos,CharBuff(),CodeMask(),cl)
mempos = newpos
If cc<0 ;If a file error, return without completing the decode
FreeMemory(lpBUFF)
FreeMemory(*mem)
Debug "GIF Load Error!GIF image contained an in-valid LZW code."
ProcedureReturn #False ;FILE_ERROR
EndIf
;If the code is a clear code, re-initialise all necessary items.
If cc=ClearCode
cl\CurrCodeSize=LZWCodeSize+1
Slot=NewCodes
TopSlot=1 << cl\CurrCodeSize
;Continue reading codes until we get a non-clear code
;(another unlikely, but possible case...)
While cc=ClearCode
cc=GIF_NextCode(*mem, mempos, @newpos, CharBuff(), CodeMask(),cl)
mempos = newpos
Wend
;If we get an ending code immediately after a clear code
;(yet another unlikely case), then break out of the loop.
If cc=EndingCode
Break ;end loop
EndIf
;Finally, if the code is beyond the range of already set codes,
;(This one had better not happen, I have no idea what will
;result from this, but I doubt it will look good)
;then set it to color zero.
If cc>=Slot
cc=0
EndIf
OldCode=cc
TempOldCode=OldCode
;And let us not forget to put the char into the buffer, and if,
;on the off chance, we were exactly one pixel from the end of
;the line, we have to send the buffer to the OutLineGIF() routine
*lpBuffPtr\b=cc
*lpBuffPtr+1
BufCnt-1
If BufCnt=0
GIF_OutLine(lpBUFF,width,height,cl)
*lpBuffPtr=lpBUFF
BufCnt=width
EndIf
Else
;In this case, it's not a clear code or an ending code, so it
;must be a code code. So we can now decode the code into a
;stack of character codes (Clear as mud, right?).
code=cc
If code=Slot
code=TempOldCode
*lpSP\b=OldCode
*lpSP+1
EndIf
;Here we scan back along the linked list of prefixes, pushing
;helpless characters (i.e. suffixes) onto the stack as we do so.
While code>=NewCodes
*lpSP\b=suffix(code)
*lpSP+1
code=prefix(code)
Wend
;Push the last character on the stack, and set up the new
;prefix and suffix, and if the required slot number is greater
;than that allowed by the current bit size, increase the bit
;size. (Note - if we are all full, we *don't* save the new
;suffix and prefix. I'm not certain if this is correct,
;it might be more proper to overwrite the last code.
*lpSP\b=code
*lpSP+1
If Slot<TopSlot
OldCode=code
suffix(Slot)=OldCode
prefix(Slot)=TempOldCode
Slot+1
TempOldCode=cc
EndIf
If Slot>=TopSlot
If cl\CurrCodeSize<12
TopSlot=TopSlot << 1
cl\CurrCodeSize+1
EndIf
EndIf
;Now that we've pushed the decoded string (in reverse order)
;onto the stack, lets pop it off and put it into our decode
;buffer, and when the decode buffer is full, write another line.
While *lpSP>@stack(0)
*lpSP-1
*lpBuffPtr\b=*lpSP\b
*lpBuffPtr+1
BufCnt-1
If BufCnt=0
GIF_OutLine(lpBUFF,width,height,cl)
*lpBuffPtr=lpBUFF
BufCnt=width
EndIf
Wend
EndIf
Wend
If BufCnt<>width ;If there are any left, output the bytes
GIF_OutLine(lpBUFF,width-BufCnt-1,height,cl)
EndIf
;Create the DDB bitmap
*dib=hDIB
If *dib=0 ;Avoid errors
ProcedureReturn #False
EndIf
Bits=*dib+*dib\biSize+(*dib\biClrUsed*4) ;Pointer to bits
;- create the bitmap
;Create the DDB bitmap
hImage = GIF_CreateDIImage(*dib, TransColorIndex)
pbimage=CreateImage(#PB_Any,realwidth,realheight, 32 | #PB_Image_Transparent)
StartDrawing(ImageOutput(pbimage))
DrawingMode(#PB_2DDrawing_AlphaBlend)
; For some retarded reason, we have to draw and redraw the GIF frames over the previous image imagenumber-1
; If bUseGlobalColMap ; if a local color table, then draw previous image in array, and then dray new hbitmap with transparency
; Box(0,0,realwidth,realheight,$FFFFFF)
; DrawImage(imageArray(numberimages-1),0,0)
; If tflag=1
; ;loc
; DrawTransparentImage(drawdc,hBitmap,im\imLeft,im\imTop,im\imWidth,im\imHeight,transcolor)
; Else
; DrawImage(hBitmap,im\imLeft,im\imTop,im\imWidth,im\imHeight)
; EndIf
; Else
If disposalmethod = 1
;Box(0,0,realwidth,realheight,$FFFFFF)
DrawImage(ImageID(GIF_Frames(numberimages-1)\Image),0,0)
DrawImage(ImageID(hImage),im\imLeft,im\imTop,im\imWidth,im\imHeight)
ElseIf disposalmethod = 2
;Box(0,0,realwidth,realheight,$FFFFFF)
;DrawImage(ImageID(GIF_Frames(1)),0,0)
DrawImage(ImageID(hImage),im\imLeft,im\imTop,im\imWidth,im\imHeight)
Else
;Box(0,0,realwidth,realheight,$FFFFFF)
DrawImage(ImageID(GIF_Frames(numberimages-1)\Image),0,0)
;DrawImage(hBitmap,im\imLeft,im\imTop)
DrawImage(ImageID(hImage),im\imLeft,im\imTop,im\imWidth,im\imHeight)
EndIf
; EndIf
StopDrawing()
FreeImage(hImage)
FreeMemory(hDIB) ;Free the DIB
ReDim GIF_Frames(numberimages)
GIF_Frames(numberimages)\Image = pbimage
GIF_Frames(numberimages)\DelayTime = delaytime
numberimages + 1
Wend
FreeMemory(*mem)
ProcedureReturn numberimages
EndProcedure
[example1.pb]
Code:
EnableExplicit
XIncludeFile "GIFanimation.pbi"
Define.w a
Dim Frames.GIF_Frame(0)
OpenWindow(0, 0, 0, 800, 600, "Gif_Test", #PB_Window_SystemMenu|#PB_Window_ScreenCentered|#PB_Window_SizeGadget|#PB_Window_MaximizeGadget)
ButtonGadget(0,10,10,80,20,"Open File")
ImageGadget(1,50,50,0,0,0, #PB_Image_Border)
AddWindowTimer(0, 0, 100)
Repeat
Select WaitWindowEvent()
Case #PB_Event_Gadget
Select EventGadget()
Case 0
Define.s Pattern="All Supported Formats|*.gif"
Define.s filename=OpenFileRequester("Choose An Image File To Open","",Pattern,0)
If filename
If GIF_LoadFrames(Frames(), filename)
ResizeGadget(1, #PB_Ignore, #PB_Ignore, ImageWidth(Frames(0)\Image), ImageHeight(Frames(0)\Image))
;SetGadgetState(0, ImageID(Frames(0)\Image))
EndIf
EndIf
EndSelect
Case #PB_Event_CloseWindow
Break
Case #PB_Event_Timer
RemoveWindowTimer(0, 0)
If a > ArraySize(Frames()) : a = 0 : EndIf
If IsImage(Frames(a)\Image)
SetGadgetState(1, ImageID(Frames(a)\Image))
AddWindowTimer(0, 0, Frames(a)\DelayTime * 10)
Else
AddWindowTimer(0, 0, 100)
EndIf
a + 1
EndSelect
ForEver
[example2.pb] catches from memory
Code:
EnableExplicit
XIncludeFile "GIFanimation.pbi"
Dim Frames.GIF_Frame(0)
Define i, count
If GIF_LoadFrames(Frames(), "", ?Loading2_gif_start, 7998)
count = ArraySize(Frames())
OpenWindow(0, #PB_Ignore, #PB_Ignore, ImageWidth(Frames(0)\Image) + 20, ImageHeight(Frames(0)\Image) + 20, "")
ImageGadget(0, 10, 10, ImageWidth(Frames(0)\Image), ImageHeight(Frames(0)\Image), ImageID(Frames(0)\Image))
AddWindowTimer(0, 1, Frames(0)\DelayTime * 10)
i = 0
Repeat
Select WaitWindowEvent()
Case #PB_Event_CloseWindow
Break
Case #PB_Event_Timer
Select EventTimer()
Case 1
SetGadgetState(0, ImageID(Frames(i)\Image))
i + 1
If i > count : i = 0 : EndIf
EndSelect
EndSelect
ForEver
EndIf
DataSection
Loading2_gif_start:
; size : 7998 bytes
Data.q $00A0613938464947,$7C7E7C0000F20014,$8A8CACAAACECEAEC,$F4848684FCFEFC8C,$04F9218C8E8CF4F2
Data.q $0BFF210004000709,$455041435354454E,$0000000103302E32,$1400A0000000002C,$FEDCBA48FE030000
Data.q $CDEB38BDAB49CA30,$9E69648E2860FFBB,$2C70BEEB6CAEAA68,$364860871C219BCF,$0213D22EDCB7F3AE
Data.q $95320C47F148437D,$812350752963E4CE,$EC90020C0000A001,$43F05EB96B0DFBB6,$1D83B564CFAF2E8C
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