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**
** $Id: SaveClip.S,v 21.2 92/05/18 02:16:29 chris Exp $
** $Revision: 21.2 $
**
** $Filename: SaveClip.S $
** $Author: chris $
** $Release: 19.1 $
** $Date: 92/05/18 02:16:29 $
**
** iff.library/IFFL_SaveClip
**
** COPYRIGHT (C) 1987-1992 BY CHRISTIAN A. WEBER, BRUGGERWEG 2,
** CH-8037 ZUERICH, SWITZERLAND. ALL RIGHTS RESERVED. NO PART
** OF THIS SOFTWARE MAY BE COPIED, REPRODUCED, OR TRANSMITTED
** IN ANY FORM OR BY ANY MEANS, WITHOUT THE PRIOR WRITTEN PER-
** MISSION OF THE AUTHOR. USE AT YOUR OWN RISK.
**
IDNT IFFL_SaveClip
SECTION text,CODE
INCLUDE "IFFLib.i"
XREF SetError,ClearError,CalcViewModes
XDEF SaveClipFunc
******* iff.library/IFFL_SaveClip *******************************************
*
* NAME
* IFFL_SaveClip -- save a part of a BitMap as an IFF-file
*
* SYNOPSIS
* result = IFFL_SaveClip
* D0 ( filename, bitmap, coltab, flags, xoff, yoff, width, height )
* A0 A1 A2 D0 D1 D2 D3 D4
*
* FUNCTION
* Save a part of a BitMap as an IFF file
*
* INPUTS
* filename - Name of the IFF file to create
* bitmap - Pointer to the BitMap holding your picture
* colortable - Pointer to an Amiga ColorTable structure or zero
* (if colortable = 0, no CMAP chunk will be generated).
* flags - Bit 0: 1 = Use the "CmpByteRun1" compression algorythm,
* 0 = Save the file uncompressed
* Bit 7: 1 = This is a HAM (Hold and modify) picture
* 0 = This is a normal or Extra-Halfbrite picture
* xoff - X offset of the clip to be saved (bytes from the left)
* yoff - Y offset of the clip to be saved (lines from the top)
* width - width in bytes of the rectangle
* height - height in lines of the rectangle
*
* RESULTS
* Non-zero if successful, 0 if an error occurred. You can then call
* IFFL_IFFError() to know more about the reason of the failure.
*
* NOTE
* Up to V19 this routine needs at least 650 bytes of stack space
*
* BUGS
* The width of the rectangle will be truncated to WORD boundaries,
* because DPAINT wants it!
*
* SEE ALSO
* IFFL_SaveBitMap()
*
*****************************************************************************
MAXPLANES EQU 32 ; Höchstens 32 Bitplanes
BUFFERSIZE EQU 10240 ; Write-Buffer
BUFFERFULL EQU BUFFERSIZE-2048 ; naja...
STRUCTURE Stack,0
STRUCT stk_BMHD,bmh_SIZEOF ; Muss am Anfang sein
ULONG stk_CAMG
STRUCT stk_Planes,4*MAXPLANES
LABEL stk_SIZEOF
SaveClipFunc: movem.l d2-d7/a2-a6,-(SP)
suba.w #stk_SIZEOF,SP ; Platz schaffen
move.l d0,d6 ; D6 : Flags
move.l a2,d5 ; D5 : Farbtabelle oder NULL
move.l a0,a2 ; A2 : Filename
movea.l a6,a5 ; A5 : IFFBase
movea.l a1,a4 ; A4 : BitMap
*** BMHD erstellen auf dem Stack und Parameter eintragen
andi.w #15,d0 ; A rough guess :-)
move.b d0,bmh_Compression(SP)
lsl.w #3,d1 ; Aus Bytes mach Pixel
movem.w d1/d2,bmh_XPos(SP) ; X und Y-Position
bclr #0,d3 ; Breite WORD align für DPaint
lsl.w #3,d3 ; Aus Bytes mach Pixel
movem.w d3/d4,bmh_Width(SP) ; Breite und Höhe
movem.w d3/d4,bmh_XAspect(SP) ; Aspect ratio
move.w bm_BytesPerRow(a4),d0
lsl.w #3,d0
move.w d0,bmh_PageWidth(SP)
move.w bm_Rows(a4),bmh_PageHeight(SP)
move.b bm_Depth(a4),bmh_nPlanes(SP)
clr.b bmh_Masking(SP)
clr.b bmh_Pad1(SP)
clr.w bmh_TranspCol(SP)
*** Puffer für Body-Daten (und CMAP) allozieren
moveq.l #IFFL_ERROR_NOMEM,d4 ; D4 : Default-Error-Code
move.l #BUFFERSIZE,d0
moveq.l #MEMF_PUBLIC,d1 ; No VMem! :-)
movea.l iffb_SysBase(a5),a6
JSRLIB AllocMem
tst.l d0
beq .NoMemory
movea.l d0,a3 ; A3 : Buffer
*** IFF-File zum Schreiben öffnen
moveq.l #IFFL_ERROR_WRITE,d4 ; D4 : Default-Error-Code
movea.l a2,a0 ; Filename
moveq.l #IFFL_MODE_WRITE,d0
movea.l a5,a6 ; IFFBase
JSRLIB IFFL_OpenIFF
tst.l d0
beq .OpenError
movea.l d0,a2 ; A2 : IFF-Handle
*** BMHD-Chunk schreiben
move.l #ID_ILBM,d0
move.l #ID_BMHD,d1
moveq.l #bmh_SIZEOF,d2
movea.l SP,a1 ; BMHD-Struktur
bsr WriteChunk
beq .WriteError
*** CAMG-Chunk generieren
movea.l SP,a0 ; BMHD-Struktur
bsr CalcViewModes ; ViewModes nach D0
btst.l #7,d6 ; HAM gewünscht ?
beq.b .NoHAM ; nein --->
bset.l #11,d0 ; HAM-Bit setzen
.NoHAM: move.l d0,stk_CAMG(SP) ; ViewModes auf Stack
*** CAMG-Chunk schreiben
;; move.l #ID_ILBM,d0
move.l #ID_CAMG,d1
moveq.l #4,d2 ; 1 LONG
lea stk_CAMG(SP),a1 ; CAMG-Langwort
bsr WriteChunk
beq .WriteError
*** CMAP-Chunk generieren und schreiben, falls notwendig
tst.l d5 ; CMAP vorhanden ?
beq .NoCMap ; nein --->
moveq.l #0,d0
move.b bm_Depth(a4),d0 ; Anzahl Planes
cmpi.b #8,d0 ; Mehr als 256 Farben (z.b. 24 bit)?
blo.b .No24 ; nein --->
moveq #8,d0 ; Sonst maximal 256 Farben
.No24:
moveq.l #1,d1 ; Bit-Maske zum Shiften
lsl.w d0,d1 ; D1 := 2^D0 = Anzahl Farben
move.l d1,d2 ; D2 : Anzahl Farben
movea.l d5,a0 ; Amiga-Farbpalette
movea.l a3,a1 ; Destination-Buffer
bra.b .CMapDBF ; ---> für DBF
.CMapLoop: move.w (a0),d0
lsr.w #8,d0 ; Rot-Anteil
mulu.w #17,d0 ; aus 0n mach nn
move.b d0,(a1)+
move.w (a0),d0
lsr.w #4,d0 ; Grün-Anteil
andi.w #15,d0
mulu.w #17,d0 ; aus 0n mach nn
move.b d0,(a1)+
move.w (a0)+,d0
;; lsr.w #0,d0 ; Blau-Anteil
andi.w #15,d0
mulu.w #17,d0 ; aus 0n mach nn
move.b d0,(a1)+
.CMapDBF: dbf d1,.CMapLoop
;; move.l #ID_ILBM,d0
move.l #ID_CMAP,d1
mulu.w #3,d2 ; 3 Bytes pro Farbe gibt Size
movea.l a3,a1 ; CMAP-Daten
;; movea.l a5,a6 ; IFFBase
bsr WriteChunk
tst.l d0
beq .WriteError
.NoCMap:
*** BODY-Chunk eröffnen
movea.l a2,a0 ; IFF-Handle
;; move.l #ID_ILBM,d0
move.l #ID_BODY,d1
movea.l a5,a6 ; IFFBase
JSRLIB IFFL_PushChunk
tst.l d0
beq .WriteError
*** PlanePtrs auf den Stack kopieren & X,Y-Offsets dazuaddieren
moveq.l #0,d0 ; D1 nicht nötig wegen mulu
movem.w bmh_XPos(SP),d0/d1 ; X- und Y-Offset
lsr.w #3,d0 ; X: aus Pixel mach Bytes
mulu.w bm_BytesPerRow(a4),d1 ; Y mal Bildbreite
add.l d0,d1 ; D1 : Total-Offset
lea bm_Planes(a4),a0 ; Source
lea stk_Planes(SP),a1 ; Destination
moveq.l #MAXPLANES-1,d2 ; Alle PlanePtrs (naja...)
.CopyPlanes: move.l (a0)+,d0 ; PlanePtr
add.l d1,d0 ; Offset dazu
move.l d0,(a1)+ ; speichern
dbf d2,.CopyPlanes
*** Tada! BODY-Daten schreiben
movem.w bmh_Width(SP),d3/d4 ; Breite & Höhe
lsr.w #3,d3 ; D3 : Bytes per row to write
moveq.l #0,d5
move.b bm_Depth(a4),d5
subq.w #1,d5 ; D5 : Depth-1 (für dbf)
move.w bm_BytesPerRow(a4),d6 ; D6 : BytesPerRow der BitMap
moveq.l #0,d7 ; D7 : Buffer-Füllstand
bra.b .RowDBF
.RowLoop: lea stk_Planes(SP),a4 ; A4 : Plane-Array
move.l d5,d2 ; Depth-1
.PlaneLoop: cmpi.w #BUFFERFULL,d7 ; Zeit den Puffer zu leeren ?
blo.b .NoDump ; noch nicht --->
movea.l a2,a0 ; IFF-Handle
movea.l a3,a1 ; Buffer
move.l d7,d0 ; Len
;; movea.l a5,a6 ; IFFBase
JSRLIB IFFL_WriteChunkBytes
tst.l d0
beq.b .WriteError
moveq.l #0,d7 ; Buffer ist wieder leer
.NoDump:
movea.l (a4),a0 ; Source: Nächste Linie/Plane
lea 0(a3,d7.l),a1 ; Destination: Buffer
move.l d3,d0 ; Len
moveq.l #0,d1
move.b bmh_Compression(SP),d1
;; movea.l a5,a6 ; IFFBase
JSRLIB IFFL_CompressBlock
tst.l d0
beq.b .WriteError
add.l d0,d7 ; Buffersize += komprimierte Länge
add.l d6,(a4)+ ; auf nächste Linie
dbf d2,.PlaneLoop ; ---> Loop
.RowDBF: dbf d4,.RowLoop ; ---> Loop
*** Buffer ein letztes Mal leeren
movea.l a2,a0 ; IFF-Handle
movea.l a3,a1 ; Buffer
move.l d7,d0 ; Len
;; movea.l a5,a6 ; IFFBase
JSRLIB IFFL_WriteChunkBytes
tst.l d0
beq.b .WriteError
*** BODY-Chunk abschliessen
movea.l a2,a0 ; IFF-Handle
;; movea.l a5,a6 ; IFFBase
JSRLIB IFFL_PopChunk
tst.l d0
beq.b .WriteError
moveq.l #0,d4 ; D4 : Error-Code: OK!!
*** IFF-File schliessen
.WriteError: movea.l a2,a1 ; IFF-Handle
;; movea.l a5,a6 ; IFFBase
JSRLIB IFFL_CloseIFF
*** Buffer freigeben
.OpenError: move.l #BUFFERSIZE,d0
movea.l a3,a1
movea.l iffb_SysBase(a5),a6
JSRLIB FreeMem
*** Fehlerkode setzen falls nötig
.NoMemory: move.l d4,d0 ; Error ?
beq.b .Okay ; noe --->
bsr SetError ; Error setzen, D0 := 0
bra.b .End
.Okay: bsr ClearError
*** Routine beenden
.End: adda.w #stk_SIZEOF,SP ; Stack aufräumen
movem.l (SP)+,d2-d7/a2-a6
rts
*****************************************************************************
** Chunk in File schreiben:
** A1=Adresse, A2=Handle, D0=TYPE, D1=ID, D2=Size, A6=IFFBase
** Zerstört D0/D1/A0/A1.
** Resultat: D0>0 und Z=0 falls OK, D0=0 und Z=1 falls Error
WriteChunk: move.l a1,-(SP) ; Adresse retten
movea.l a2,a0 ; IFF-Handle
JSRLIB IFFL_PushChunk
movea.l (SP)+,a1
tst.l d0
beq.b .Error
movea.l a2,a0 ; IFF-Handle
move.l d2,d0 ; Grösse
JSRLIB IFFL_WriteChunkBytes
tst.l d0
beq.b .Error
movea.l a2,a0 ; IFF-Handle
JSRLIB IFFL_PopChunk
tst.l d0
;; beq.b .Error
.Error: rts
END
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