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PicPak_v1.3c
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pic_pak.c
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C/C++ Source or Header
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1992-02-01
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1,173 lines
/***************************************************************************
* pic_pak.c - "PicPak" - IFF ILBM picture manipulation functions *
* (c) 1990 Videoworks Computer Applications *
* All rights reserved. *
* *
* Written by Paul T. Miller *
* *
* DISCLAIMER: *
* Feel free to use these routines or derivatives in your own code, but *
* please leave credit in your documentation. This code is NOT public *
* domain, and I am only allowing use of it because I'm a nice guy and I *
* want to show people how to effectively use their code. If you make any *
* modifications or enhancements to this code, please let me know. *
* *
* Send comments/suggestions to: *
* Paul Miller *
* The MBT, Coconut Telegraph, The TARDIS *
* *
* Program Name: N/A *
* Version: 1 *
* Revision: 3 *
*-------------------------------------------------------------------------*
* File: (pic_pak.c) IFF package routines *
*-------------------------------------------------------------------------*
* Modification History *
* Date Author Comment *
* -------- ------ ------- *
* 10-02-90 PTM Created. Pic allocation/freeing with specified memtype
* 10-03-90 PTM iff.library hooks
* 10-08-90 PTM clean up memory allocation
* 11-28-90 PTM SetImageType(), custom processing of non-standard forms
* ViewPort fade/color set functions, color-cycling
* 12-01-90 PTM SHAM Chunk/ColorMap support - improve file parsing
* 12-02-90 PTM SHAM Copper-list code, ViewPort support code
* 12-06-90 PTM Add image decompression buffer
* 12-07-90 PTM Free mask plane if present in a Frame BitMap
* 10-13-91 PTM re-prototype
***************************************************************************/
#ifndef PIC_PAK_H
#include "pic_pak.h"
#endif
extern struct Custom far custom;
extern struct GfxBase *GfxBase;
extern struct IntuitionBase *IntuitionBase;
extern struct Library *DOSBase;
/* Some IFF parsing structs/constants */
#define BUFFER_SIZE 32000 /* image decompression buffer */
#define MAKE_ID(a,b,c,d) (((long)(a)<<24)|((long)(b)<<16)|((long)(c)<<8)|(long)(d))
/* IFF types we may encounter */
#define FORM MAKE_ID('F', 'O', 'R', 'M')
#define ILBM MAKE_ID('I', 'L', 'B', 'M')
#define BMHD MAKE_ID('B', 'M', 'H', 'D')
#define CMAP MAKE_ID('C', 'M', 'A', 'P')
#define BODY MAKE_ID('B', 'O', 'D', 'Y')
#define CAMG MAKE_ID('C', 'A', 'M', 'G')
#define CRNG MAKE_ID('C', 'R', 'N', 'G')
#define SHAM MAKE_ID('S', 'H', 'A', 'M')
#define DYCP MAKE_ID('D', 'Y', 'C', 'P')
#define CTBL MAKE_ID('C', 'T', 'B', 'L')
#define GRAB MAKE_ID('G', 'R', 'A', 'B')
#define SPRT MAKE_ID('S', 'P', 'R', 'T')
#define CCRT MAKE_ID('C', 'C', 'R', 'T')
#define DPPV MAKE_ID('D', 'P', 'P', 'V')
#define DPPS MAKE_ID('D', 'P', 'P', 'S')
#define byte(n) (((n + 15) >> 4) << 1) /* Word aligned width in bytes. */
struct BitMapHeader {
UWORD w,h; /* Raster width & height. */
UWORD x,y; /* Pixel position. */
UBYTE nPlanes; /* Number of source bitplanes. */
UBYTE masking; /* Masking... good for nothing maybe? */
UBYTE compression; /* Packed or unpacked? */
UBYTE pad1; /* We don't like odd length structures. */
UWORD transparentColor; /* Maybe good for... */
UBYTE xAspect, yAspect; /* Kind of quotient, width / height. */
WORD pageWidth, pageHeight; /* Source page size. */
};
/* IFF Stuff */
union typekludge {
char type_str[4];
long type_long;
};
struct ChunkHeader {
union typekludge chunktype;
long chunksize;
};
#define TYPE chunktype.type_long
#define STRTYPE chunktype.type_str
/* Masking techniques */
#define mskNone 0
#define mskHasMask 1
#define mskHasTransparentColor 2
#define mskLasso 3
/* Compression techniques */
#define cmpNone 0
#define cmpByteRun1 1
/* color-cycling stuff */
#define CRNG_NORATE 36 /* Don't cycle this range. */
#define CRNG_ACTIVE 1 << 0 /* This range is active. */
#define CRNG_REVERSE 1 << 1 /* This range is cycling backwards. */
/* GraphiCraft private cycling chunk. */
struct CcrtChunk {
WORD direction;
UBYTE start;
UBYTE end;
LONG seconds;
LONG microseconds;
WORD pad;
};
/* some color-cycling globals (used only if color-cycling is enabled) */
struct CycleData *cdata = NULL;
int i, j; /* general-purpose indexes used by cycler */
UWORD fade_delay = 0;
ULONG max_bufsize = BUFFER_SIZE;
struct Pic *AllocatePic(UWORD width, UWORD height, UBYTE depth, UBYTE memtype)
{
struct Pic *pic;
struct BitMap *bitmap;
ULONG i, size, memsize;
if (memtype == NULL)
memtype = MEMTYPE_CHIP;
pic = (struct Pic *)AllocMem(PIC_SIZE, MEMF_CLEAR);
if (!pic) return(NULL);
bitmap = &pic->BitMap;
InitBitMap(bitmap, (long)depth, (long)width, (long)height);
pic->Width = width;
pic->Height = height;
pic->Depth = depth;
pic->Colors = 1<<depth;
size = bitmap->BytesPerRow * bitmap->Rows;
memsize = size * (ULONG)depth;
if (memtype != MEMTYPE_NONE)
{
/* attempt to allocate a chunk of the required memory size and type */
if (memtype == MEMTYPE_ANY) /* if ANY type, try CHIP first */
{
bitmap->Planes[0] = (PLANEPTR)AllocMem(memsize, MEMF_CHIP);
if (!bitmap->Planes[0])
memtype = MEMTYPE_FAST; /* out of CHIP, try for FAST */
}
if (memtype == MEMTYPE_CHIP)
bitmap->Planes[0] = (PLANEPTR)AllocMem(memsize, MEMF_CHIP);
if (memtype == MEMTYPE_FAST)
bitmap->Planes[0] = (PLANEPTR)AllocMem(memsize, MEMF_FAST);
if (!bitmap->Planes[0]) /* couldn't get the memory */
{
FreePic(pic);
return(NULL);
}
for (i = 1; i < depth; i++) /* set the plane pointers */
bitmap->Planes[i] = (PLANEPTR)(bitmap->Planes[0] + (i * size));
}
if (memtype == MEMTYPE_ANY) /* actually got CHIP ram */
memtype = MEMTYPE_CHIP;
pic->Memtype = memtype;
return(pic);
}
void FreePic(struct Pic *pic)
{
ULONG size, chunksize;
struct BitMap *bm;
if (pic)
{
if (bm = &pic->BitMap)
{
size = bm->BytesPerRow * bm->Rows;
chunksize = size * (ULONG)bm->Depth;
if (bm->Planes[0])
FreeMem(bm->Planes[0], chunksize);
}
if (pic->PicExt)
{
switch (pic->Type)
{
case PICTYPE_SHAM:
FreeMem(pic->PicExt, SHAMDATA_SIZE);
break;
case PICTYPE_DHIRES:
size = pic->Height * DHIRES_COLORS * sizeof(WORD);
FreeMem(pic->PicExt, size);
break;
}
}
FreeMem(pic, PIC_SIZE);
}
}
struct Frame *AllocateFrame(UWORD width, UWORD height, UBYTE depth)
{
struct Frame *frame;
struct BitMap *bitmap;
ULONG i, size, memsize;
frame = (struct Frame *)AllocMem(FRAME_SIZE, MEMF_CLEAR);
if (!frame) return(NULL);
bitmap = &frame->BitMap;
InitBitMap(bitmap, (long)depth, (long)width, (long)height);
frame->Width = width;
frame->Height = height;
size = bitmap->BytesPerRow * bitmap->Rows;
memsize = size * (ULONG)depth;
bitmap->Planes[0] = (PLANEPTR)AllocMem(memsize, MEMF_CHIP);
if (!bitmap->Planes[0])
{
FreeMem(frame, FRAME_SIZE);
return(NULL);
}
for (i = 1; i < depth; i++) /* set the plane pointers */
bitmap->Planes[i] = (PLANEPTR)(bitmap->Planes[0] + (i * size));
return(frame);
}
void FreeFrame(struct Frame *frame)
{
ULONG size, chunksize;
struct BitMap *bm;
if (frame)
{
if (bm = &frame->BitMap)
{
size = RASSIZE(bm->BytesPerRow * 8, bm->Rows);
chunksize = size * (ULONG)bm->Depth;
if (bm->Planes[0])
FreeMem(bm->Planes[0], chunksize);
if (bm->Planes[bm->Depth]) /* extra mask plane */
FreeMem(bm->Planes[bm->Depth], size);
}
FreeMem(frame, FRAME_SIZE);
}
}
struct Pic *LoadPic(STRPTR filename, UBYTE memtype)
{
return(LoadImage(filename, NULL, PICTYPE_NORMAL, memtype));
}
struct Pic *LoadPic2BitMap(STRPTR filename, struct BitMap *bitmap)
{
return(LoadImage(filename, bitmap, PICTYPE_NORMAL, MEMTYPE_NONE));
}
struct Frame *LoadFrame(STRPTR filename)
{
return((struct Frame *)LoadImage(filename, NULL, PICTYPE_FRAME, NULL));
}
struct Pic *LoadImage(STRPTR filename, struct BitMap *bitmap, UBYTE type, UBYTE memtype)
{
struct Pic *pic = NULL;
struct Frame *frame = NULL;
struct BitMapHeader bmhd;
struct ChunkHeader ch;
FILE *file;
LONG formsize, subtype;
UWORD version;
ULONG size;
file = fopen(filename, "r");
if (!file)
return(NULL);
if (!fread((char *)&ch, sizeof(struct ChunkHeader), 1, file))
{
fclose(file);
return(NULL);
}
if (ch.TYPE != FORM) /* not an IFF file */
{
fclose(file);
return(NULL);
}
if (!fread((char *)&subtype, sizeof(subtype), 1, file))
{
fclose(file);
return(NULL);
}
formsize = ch.chunksize - sizeof(subtype);
if (subtype != ILBM) /* not an ILBM image */
{
fclose(file);
return(NULL);
}
while (formsize > 0)
{
if (!fread((char *)&ch, sizeof(struct ChunkHeader), 1, file))
{
fclose(file);
if (pic) FreePic(pic);
if (frame) FreeFrame(frame);
return(NULL);
}
formsize -= sizeof(struct ChunkHeader);
switch (ch.TYPE)
{
case BMHD:
fread((char *)&bmhd, ch.chunksize, 1, file);
/* some error checking */
if (bmhd.nPlanes < 1 || bmhd.nPlanes > 8)
{
fclose(file);
return(NULL);
}
if (bitmap) /* application has supplied a BitMap */
memtype = MEMTYPE_NONE;
if (type == PICTYPE_FRAME)
{
frame = AllocateFrame(bmhd.w, bmhd.h, bmhd.nPlanes);
if (!frame)
{
fclose(file);
return(NULL);
}
frame->X = bmhd.w;
frame->Y = bmhd.h;
}
else
{
pic = AllocatePic(bmhd.w, bmhd.h, bmhd.nPlanes, memtype);
if (!pic)
{
fclose(file);
return(NULL);
}
}
break;
case CMAP:
if (type == PICTYPE_FRAME)
{
fseek(file, ch.chunksize, 1);
break;
}
pic->Colors = LoadCMAP(file, ch.chunksize, &pic->Colormap[0]);
break;
case CAMG:
if (type == PICTYPE_FRAME)
{
fseek(file, ch.chunksize, 1);
break;
}
fread((char *)&subtype, sizeof(subtype), 1, file);
pic->ViewModes = (ULONG)subtype;
if ((UWORD)pic->ViewModes == NULL)
pic->ViewModes >>= 16L;
pic->ViewModes &= ~(SPRITES|VP_HIDE|PFBA|GENLOCK_AUDIO|GENLOCK_VIDEO);
break;
case CRNG:
case CCRT:
if (type == PICTYPE_FRAME || pic->Cycles == MAXCRANGES)
{
fseek(file, ch.chunksize, 1);
break;
}
LoadCycleRange(file, &pic->CRanges[pic->Cycles], ch.TYPE);
pic->Cycles++;
break;
case SHAM:
if (type == PICTYPE_FRAME)
{
fseek(file, ch.chunksize, 1);
break;
}
pic->PicExt = (APTR)AllocMem(SHAMDATA_SIZE, NULL);
if (!pic->PicExt)
fseek(file, ch.chunksize, 1);
else
{
fread((char *)&version, sizeof(UWORD), 1, file);
ch.chunksize -= sizeof(UWORD);
if (version == 0)
{
fread((char *)pic->PicExt, ch.chunksize, 1, file);
pic->Type = PICTYPE_SHAM;
}
else
fseek(file, ch.chunksize, 1);
}
break;
case CTBL:
if (type == PICTYPE_FRAME)
{
fseek(file, ch.chunksize, 1);
break;
}
size = pic->Height * DHIRES_COLORS * sizeof(WORD);
pic->PicExt = (APTR)AllocMem(size, NULL);
if (!pic->PicExt)
fseek(file, ch.chunksize, 1);
else
{
fread((char *)pic->PicExt, ch.chunksize, 1, file);
pic->Type = PICTYPE_DHIRES;
}
break;
case BODY:
if (type == PICTYPE_FRAME && frame)
{
if (!LoadRaster(file, ch.chunksize, &frame->BitMap.Planes[0], &bmhd))
{
fclose(file);
FreeFrame(frame);
return(NULL);
}
}
if (type != PICTYPE_FRAME)
{
if (!bitmap)
bitmap = &pic->BitMap;
if (!LoadRaster(file, ch.chunksize, &bitmap->Planes[0], &bmhd))
{
fclose(file);
FreePic(pic);
return(NULL);
}
}
/* make sure the BODY isn't off a few bytes */
if (formsize - ch.chunksize > 0)
ch.chunksize += (formsize - ch.chunksize);
break;
default:
fseek(file, ch.chunksize, 1);
break;
}
formsize -= ch.chunksize;
if (ch.chunksize & 1) /* odd-length chunk */
{
formsize--;
fseek(file, 1L, 1);
}
}
fclose(file);
if (type == PICTYPE_FRAME)
return((struct Pic *)frame);
SetImageType(pic); /* perform any post-processing/identification */
/* now double-check the display size flags */
if (bmhd.pageHeight > 242)
pic->ViewModes |= LACE;
if (bmhd.pageWidth >= 640)
pic->ViewModes |= HIRES;
return(pic);
}
/* GetPicAttrs()
- return the specified picture's size, depth, and viewmode information
in supplied pointer variables
*/
GetPicAttrs(STRPTR filename, WORD *w, WORD *h, WORD *d, ULONG *vm)
{
struct Pic *pic;
/* load just the header information */
pic = LoadImage(filename, NULL, NULL, MEMTYPE_NONE);
if (pic)
{
*w = pic->Width;
*h = pic->Height;
*d = pic->Depth;
*vm = pic->ViewModes;
FreePic(pic);
return(1);
}
return(NULL);
}
/* Pic2BitMap()
- download Pic imagery stored in FAST RAM to the specified BitMap
*/
Pic2BitMap(struct Pic *pic, struct BitMap *bm)
{
ULONG i, size;
if (pic && bm)
{
if (pic->Memtype == MEMTYPE_CHIP)
{
BltBitMap(&pic->BitMap, 0, 0, bm, 0, 0, pic->Width,pic->Height,
0xc0, 0xff, NULL);
return(1);
}
if (pic->Depth != bm->Depth)
return(NULL);
if (pic->Width != bm->BytesPerRow * 8)
return(NULL);
if (pic->Height != bm->Rows)
return(NULL);
size = pic->BitMap.BytesPerRow * pic->BitMap.Rows;
for (i = 0; i < bm->Depth; i++)
memcpy(bm->Planes[i], pic->BitMap.Planes[i], size);
return(1);
}
return(NULL);
}
BOOL LoadRaster(FILE *file, ULONG chunksize, PLANEPTR *BitPlanes, struct BitMapHeader *BMHeader)
{
register LONG i, j, k;
register BYTE ChkVal;
register UBYTE Value, SoFar;
UBYTE Compr, Depth;
LONG Height, Width;
PLANEPTR Planes[9]; /* 9 for possible bitmask. */
UBYTE *memory = NULL;
for(i = 0; i < 9; i++)
Planes[i] = NULL;
Width = byte(BMHeader->w);
Height = BMHeader->h;
Depth = BMHeader->nPlanes;
Compr = BMHeader->compression;
if (Compr > cmpByteRun1 || !BitPlanes)
return(FALSE);
for(i = 0; i < Depth; i++)
Planes[i] = BitPlanes[i];
if (BMHeader->masking == mskHasMask)
Depth++;
if (Compr == cmpNone)
{
for (k = 0; k < Height; k++)
{
for (j = 0; j < Depth; j++)
{
if (Planes[j])
{
fread((char *)Planes[j], Width, 1, file);
Planes[j] += Width;
}
else
fseek(file, Width, 1);
}
}
}
if (Compr == cmpByteRun1)
{
if (chunksize < max_bufsize)
{
memory = (UBYTE *)AllocMem(chunksize, NULL);
if (memory)
{
fread(memory, chunksize, 1, file);
mem_decompress(memory, &Planes[0], Width, Height, Depth);
FreeMem(memory, chunksize);
return(1);
}
}
for (k = 0; k < Height; k++)
{
for (j = 0; j < Depth; j++)
{
for (SoFar = 0; SoFar < Width ;)
{
ChkVal = fgetc(file);
if (ChkVal > 0)
{
if (Planes[j])
{
fread(Planes[j], ChkVal + 1, 1, file);
Planes[j] += ChkVal + 1;
}
else
fseek(file, ChkVal + 1, 1);
SoFar += ChkVal + 1;
}
else
{
if (ChkVal != 128)
{
Value = fgetc(file);
for (i = 0; i <= -ChkVal; i++)
{
if (Planes[j])
{
*Planes[j] = Value;
Planes[j]++;
}
SoFar++;
}
}
}
}
}
}
}
return(TRUE);
}
void mem_decompress(register UBYTE *ptr, PLANEPTR *Planes, LONG Width, LONG Height, UBYTE Depth)
{
LONG i, j, k;
register BYTE ChkVal;
UBYTE Value, SoFar;
for (k = 0; k < Height; k++)
{
for (j = 0; j < Depth; j++)
{
for (SoFar = 0; SoFar < Width ;)
{
ChkVal = *ptr;
ptr++;
if (ChkVal > 0)
{
if (Planes[j])
{
memcpy(Planes[j], ptr, ChkVal+1);
Planes[j] += ChkVal + 1;
ptr += ChkVal + 1;
}
else
ptr += ChkVal + 1;
SoFar += ChkVal + 1;
}
else
{
if (ChkVal != 128)
{
Value = *ptr;
ptr++;
for (i = 0; i <= -ChkVal; i++)
{
if (Planes[j])
{
*Planes[j] = Value;
Planes[j]++;
}
SoFar++;
}
}
}
}
}
}
}
void SetPicReadBufSize(ULONG size)
{
max_bufsize = size;
}
UWORD LoadCMAP(FILE *file, LONG csize, UWORD *cmap)
{
UBYTE *ctable;
UWORD i, n;
LONG len;
len = csize;
if (len > (MAXCOLORS * 3))
len = MAXCOLORS * 3;
ctable = (UBYTE *)AllocMem(csize, NULL);
if (!ctable)
return(NULL);
fread((char *)ctable, csize, 1, file);
for (i = n = 0; n < len; i++, n += 3)
cmap[i] = ((ctable[n]>>4)<<8)+((ctable[n+1]>>4)<<4)+(ctable[n+2]>>4);
FreeMem(ctable, csize);
return(i);
}
void LoadCycleRange(FILE *file, CRange *range, LONG type)
{
struct CcrtChunk crtchunk;
switch (type)
{
case CRNG:
fread((char *)range, sizeof(CRange), 1, file);
/* Carefully determine the activity of the chunk. */
if (range->active == CRNG_NORATE || !range->rate || range->low == range->high)
range->active = 0;
/* Recalculate speed value. */
if (range->rate > 0)
range->rate = 16384 / range->rate;
else
range->rate = 0;
break;
case CCRT:
fread((char *)&crtchunk, sizeof(struct CcrtChunk), 1, file);
/* We have located a CCRT chunk, now make it a CRNG chunk. */
range->low = crtchunk.start;
range->high = crtchunk.end;
if (crtchunk.direction != 0)
range->active = CRNG_ACTIVE;
else
range->active = 0;
if (crtchunk.direction > 0)
range->active |= CRNG_REVERSE;
/* Recalculate speed (by Carolyn Scheppner). */
range->rate = 16384 / (crtchunk.seconds * 60 +
(crtchunk.microseconds + 8334) / 16667);
if (!range->rate || range->low == range->high)
range->active = 0;
if (range->rate > 0)
range->rate = 16384 / range->rate;
else
range->rate = 0;
break;
}
}
void SetImageType(struct Pic *pic)
{
/* handle custom processing of non-standard picture types */
if (pic->Type) /* already set */
{
switch (pic->Type)
{
case PICTYPE_SHAM:
pic->Colors = 16;
pic->ViewModes |= HAM;
break;
}
return;
}
if (pic->ViewModes & HAM)
{
pic->Colors = 16;
pic->Type = PICTYPE_HAM;
return;
}
if (pic->Width <= 320 && pic->Height <= 200 && pic->Depth == 6)
{
pic->Colors = MAXCOLORS;
pic->ViewModes = EXTRA_HALFBRITE;
pic->Type = PICTYPE_EHB;
return;
}
pic->Type = PICTYPE_NORMAL;
}
/**********************************************************/
/* GENERAL-PURPOSE PICTURE/VIEWPORT MANIPULATION ROUTINES */
/**********************************************************/
/*****************/
/* COLOR-CYCLING */
/*****************/
struct CycleData {
struct ViewPort *vp;
struct Pic *pic;
struct Interrupt *vblank;
UBYTE cycling;
UBYTE pad;
UWORD temp_col;
UWORD cmap[MAXCOLORS];
WORD ticks[16];
};
typedef void (*FPTR)();
InitCycler()
{
cdata = (struct CycleData *)AllocMem(sizeof(struct CycleData), MEMF_CLEAR);
if (!cdata)
return(NULL);
cdata->vblank = (struct Interrupt *)AllocMem(sizeof(struct Interrupt), MEMF_CLEAR);
if (!cdata->vblank)
return(NULL);
cdata->vblank->is_Data = NULL;
cdata->vblank->is_Code = (FPTR)cycle;
cdata->vblank->is_Node.ln_Succ = NULL;
cdata->vblank->is_Node.ln_Pred = NULL;
cdata->vblank->is_Node.ln_Type = NT_INTERRUPT;
cdata->vblank->is_Node.ln_Pri = 0;
cdata->vblank->is_Node.ln_Name = "PicPak_Color_Cycler";
AddIntServer(INTB_VERTB, cdata->vblank);
return(1);
}
void FreeCycler()
{
if (cdata)
{
if (cdata->vblank)
{
StopCycling();
RemIntServer(INTB_VERTB, cdata->vblank);
FreeMem(cdata->vblank, sizeof(struct Interrupt));
WaitTOF();
WaitTOF();
WaitTOF();
}
FreeMem(cdata, sizeof(struct CycleData));
}
}
__saveds void cycle()
{
if (cdata->cycling)
{
for (i = 0; i < cdata->pic->Cycles; i++)
{
/* Increment event counter. */
cdata->ticks[i]++;
/* Is this one up to cycle next? */
if (cdata->ticks[i] == cdata->pic->CRanges[i].rate)
{
/* Reset event counter for this range. */
cdata->ticks[i] = 0;
/* Is this range active? */
if (!(cdata->pic->CRanges[i].active & CRNG_ACTIVE))
continue;
/* Cycling backwards? */
if(cdata->pic->CRanges[i].active & CRNG_REVERSE)
{
/* Move the colours. */
cdata->temp_col = cdata->cmap[cdata->pic->CRanges[i].low];
for(j = cdata->pic->CRanges[i].low; j < cdata->pic->CRanges[i].high; j++)
cdata->cmap[j] = cdata->cmap[j+1];
cdata->cmap[cdata->pic->CRanges[i].high] = cdata->temp_col;
}
else
{
/* This one is cycling forwards. */
cdata->temp_col = cdata->cmap[cdata->pic->CRanges[i].high];
for(j = cdata->pic->CRanges[i].high; j > cdata->pic->CRanges[i].low; j--)
cdata->cmap[j] = cdata->cmap[j-1];
cdata->cmap[cdata->pic->CRanges[i].low] = cdata->temp_col;
}
/* Okay, everything has been moved, now load the new palette. */
LoadRGB4(cdata->vp, cdata->cmap, cdata->pic->Colors);
}
}
}
}
void StartCycling(struct ViewPort *vp, struct Pic *pic)
{
if (cdata && pic->Cycles)
{
cdata->pic = pic;
cdata->vp = vp;
/* reset the palette and event counters */
for (i = 0; i < pic->Colors; i++)
cdata->cmap[i] = pic->Colormap[i];
for (i = 0; i < pic->Cycles; i++)
cdata->ticks[i] = 0;
cdata->cycling = 1;
}
}
void StopCycling()
{
/* restore old colormap */
if (cdata)
{
if (cdata->cycling)
LoadRGB4(cdata->vp, &cdata->pic->Colormap[0], cdata->pic->Colors);
cdata->cycling = NULL;
}
}
void ToggleCycling()
{
if (cdata)
{
if (cdata->cycling)
StopCycling();
else
StartCycling(cdata->vp, cdata->pic);
}
}
IsCycling()
{
if (!cdata) return(NULL);
return((int)cdata->cycling);
}
/***************************/
/* VIEWPORT-COLOR ROUTINES */
/***************************/
void SetViewPortPicColors(struct ViewPort *vp, struct Pic *pic)
{
switch (pic->Type)
{
case PICTYPE_SHAM:
InitSHAM(vp, pic);
break;
case PICTYPE_DHIRES:
InitDHIRES(vp, pic);
break;
default:
LoadRGB4(vp, &pic->Colormap[0], pic->Colors);
}
}
void ClearViewPortColors(struct ViewPort *vp, UWORD colors)
{
register int i;
if (colors > MAXCOLORS)
colors = MAXCOLORS;
for (i = 0; i < colors; i++)
SetRGB4(vp, i, 0, 0, 0);
}
#define RED(c) ((c >> 8) & 0xF)
#define GREEN(c) ((c >> 4) & 0xF)
#define BLUE(c) (c & 0xF)
void FadeViewPortIn(struct ViewPort *vp, UWORD *cm, UWORD colors)
{
ULONG rf[MAXCOLORS], gf[MAXCOLORS], bf[MAXCOLORS];
register USHORT rgb, r, g, b;
WORD i, n;
if (colors > MAXCOLORS)
colors = MAXCOLORS;
for (i = 0; i < colors; i++)
{
rgb = cm[i];
rf[i] = (RED(rgb) << 16) / 15;
gf[i] = (GREEN(rgb) << 16) / 15;
bf[i] = (BLUE(rgb) << 16) / 15;
}
for (n = 1; n < 16; n++)
{
for (i = 0; i < colors; i++)
{
r = (((rf[i] * n) + 0x8000) >> 16);
g = (((gf[i] * n) + 0x8000) >> 16);
b = (((bf[i] * n) + 0x8000) >> 16);
SetRGB4(vp, i, r, g, b);
}
if (fade_delay > 0) Delay(fade_delay);
}
}
void FadeViewPortOut(struct ViewPort *vp, UWORD colors)
{
ULONG rf[MAXCOLORS], gf[MAXCOLORS], bf[MAXCOLORS];
register UWORD rgb, r, g, b;
WORD i, n;
UWORD start = 0;
if (GetRGB4(vp->ColorMap, 0) == 0x0000)
start = 1;
if (colors > MAXCOLORS)
colors = MAXCOLORS;
for (i = start; i < colors; i++)
{
rgb = GetRGB4(vp->ColorMap, i);
rf[i] = (RED(rgb) << 16) / 15;
gf[i] = (GREEN(rgb) << 16) / 15;
bf[i] = (BLUE(rgb) << 16) / 15;
}
for (n = 14; n >= 0; n--)
{
for (i = start; i < colors; i++)
{
r = (((rf[i] * n) + 0x8000) >> 16);
g = (((gf[i] * n) + 0x8000) >> 16);
b = (((bf[i] * n) + 0x8000) >> 16);
SetRGB4(vp, i, r, g, b);
}
if (fade_delay > 0) Delay(fade_delay);
}
}
void SetFadeSpeed(UWORD val)
{
fade_delay = val;
}
/* SPECIAL IMAGE TYPE INITIALIZATION CODE */
/* SHAM Copper-list initialization */
InitSHAM(struct ViewPort *vp, struct Pic *pic)
{
register UWORD i, n;
register struct SHAMData *sham;
struct UCopList *ucoplist = NULL;
BOOL lace = 0;
register WORD view_dx = IntuitionBase->ViewLord.DxOffset;
sham = (struct SHAMData *)pic->PicExt;
if (!sham) return(NULL);
SetRGB4(vp, 0, 0, 0, 0);
for (i = 1; i < 16; i++)
SetRGB4(vp, i, (UBYTE)(sham->ColorTable[0][i] / (UWORD)256),
(UBYTE)(sham->ColorTable[0][i] / (UWORD)16 % 16),
(UBYTE)(sham->ColorTable[0][i] % 16));
ucoplist = (struct UCopList *)AllocMem(sizeof(struct UCopList), MEMF_PUBLIC|MEMF_CLEAR);
if (!ucoplist) return(NULL);
if (pic->Height > LORES_HEIGHT)
lace = 1;
CINIT(ucoplist, (199*16));
for (i = 1; i < 200; i++)
{
if (lace)
{
if (view_dx < 114)
{
CWAIT(ucoplist, i + i - 2, 0);
}
else
{
if (view_dx < 129)
{
CWAIT(ucoplist, i + i - 2, 0);
}
else
{
CWAIT(ucoplist, i + i, 0);
}
}
}
else
{
if (view_dx < 128)
{
CWAIT(ucoplist, i - 1, 0);
}
else
{
CWAIT(ucoplist, i, 0);
}
}
for (n = 1; n < 16; n++)
CMOVE(ucoplist, custom.color[n], (WORD)sham->ColorTable[i][n]);
}
CEND(ucoplist);
Forbid();
vp->UCopIns = ucoplist;
Permit();
RethinkDisplay();
return(1);
}
/* Dynamic-HIRES Copper-list initialization */
InitDHIRES(struct ViewPort *vp, struct Pic *pic)
{
register UWORD i, n;
UWORD *ctbl;
struct UCopList *ucoplist = NULL;
BOOL lace = 0;
ctbl = (UWORD *)pic->PicExt;
if (!ctbl) return(NULL);
ucoplist = (struct UCopList *)AllocMem(sizeof(struct UCopList), MEMF_PUBLIC|MEMF_CLEAR);
if (!ucoplist) return(NULL);
if (pic->Height > LORES_HEIGHT)
lace = 1;
CINIT(ucoplist, (pic->Height * 16));
for (i = 0; i < pic->Height; i++)
{
CWAIT(ucoplist, i, 0);
for (n = 0; n < 16; n++)
CMOVE(ucoplist, custom.color[n], (WORD)*(ctbl+(i*16)+n));
}
CEND(ucoplist);
Forbid();
vp->UCopIns = ucoplist;
Permit();
RethinkDisplay();
return(1);
}
void FreeSHAM(struct ViewPort *vp)
{
if (vp->UCopIns)
FreeVPortCopLists(vp);
}