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IffIlbm.cpp
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IffIlbm.cpp
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/////////////////////////////////////////////////////////
//
// CIffIlbm : IFF-ILBM image format parser
//
// (c) Ilkka Prusi, 2011
//
// See format specs from:
// http://www.fine-view.com/jp/labs/doc/ilbm.txt
//
//#include "stdafx.h"
#include "IffIlbm.h"
// TODO: subclass from chunk and do processing there?
//
bool CIffIlbm::ParseBitmapHeader(uint8_t *pChunkData, CIffChunk *pChunk)
{
// BMHD bitmap header chunk:
// should be first in file (according to spec)
// and needed by later processing of data
// make byteswapping where necessary to a copy (keep original)
//BitMapHeader SwappedHd;
BitMapHeader *pBmHd = (BitMapHeader*)pChunkData;
m_BmHeader.w = Swap2(pBmHd->w);
m_BmHeader.h = Swap2(pBmHd->h);
m_BmHeader.x = Swap2(pBmHd->x);
m_BmHeader.y = Swap2(pBmHd->y);
m_BmHeader.nPlanes = pBmHd->nPlanes;
m_BmHeader.masking = pBmHd->masking;
m_BmHeader.compression = pBmHd->compression;
m_BmHeader.pad1 = pBmHd->pad1; // unused
m_BmHeader.transparentColor = Swap2(pBmHd->transparentColor);
m_BmHeader.xAspect = pBmHd->xAspect;
m_BmHeader.yAspect = pBmHd->yAspect;
m_BmHeader.pageWidth = Swap2(pBmHd->pageWidth);
m_BmHeader.pageHeight = Swap2(pBmHd->pageHeight);
return true;
}
// TODO: subclass from chunk and do processing there?
//
void CIffIlbm::ParseBody(uint8_t *pChunkData, CIffChunk *pChunk)
{
//
// The pixel values in a BODY can be indexes into the palette contained in a CMAP chunk,
// or they can be literal RGB values.
// If there is no CMAP and if BMHD.BitPlanes is 24,
// the ILBM contains a 24-bit image,
// and the BODY encodes pixels as literal RGB values.
//
int64_t ickEnd = (pChunk->m_iOffset + pChunk->m_iChunkSize);
int64_t iChOffset = pChunk->m_iOffset;
while (iChOffset < ickEnd)
{
// read each scanline for each plane
// also handle compression (if any)
// and masking-scanline (if any).
// WORDs or BYTEs ?
// WORDs (bytes??)
// note: all rows should be same size (and word-aligned?)
int iRowBytes = ((m_BmHeader.w + 15) >> 4) << 1;
// for each plane..
// with or without compression?
//if (m_BmHeader.compression == cmpNone)
for (int j = 0; j < m_BmHeader.h; j++)
{
for (int i = 0; i < m_BmHeader.nPlanes; i++)
{
// read scanline:
// output-width should be known already (in header)
// actually, arrays of ColorRegister ?
// (depends if CMAP exists..)
UBYTE *pLine = new UBYTE[iRowBytes];
//size_t nBytes = sizeof(int16_t)*m_BmHeader.w;
if (m_BmHeader.compression == cmpNone)
{
// no compression -> copy as-is
::memcpy(pLine, pChunkData, iRowBytes);
iChOffset += iRowBytes;
}
else if (m_BmHeader.compression == cmpByteRun1)
{
// decompress scanline
DecompressByteRun1(pChunkData, ickEnd, iChOffset, pLine);
}
}
// extra bitplane per "row" (see height)
if (m_BmHeader.masking != mskNone)
{
// read masking
/*
UBYTE *pLine = new UBYTE[iRowBytes];
::memcpy(pLine, pChunkData, iRowBytes);
iChOffset += iRowBytes;
*/
}
}
}
}
void CIffIlbm::DecompressByteRun1(uint8_t *pData, const int64_t ickEnd, int64_t &iChOffset, UBYTE *pLine)
{
//for (UWORD i = 0; i < m_BmHeader.w; i++)
UWORD i = 0;
while (i < m_BmHeader.w && iChOffset < ickEnd)
{
int8_t bMark = (int8_t)pData[iChOffset]; // compression flag
uint8_t bNext = pData[iChOffset+1]; // byte to replicate or not
if (bMark >= 0)
{
// copy next (bMark +1) bytes as-is
int j = 0;
while (j < bMark)
{
pLine[i] = pData[iChOffset+1];
iChOffset++;
i++;
j++;
}
}
else if (bMark < 0 && bMark >= -127)
{
// replicate bNext (-bMark +1) times
int j = 0;
while (j < (bMark*-1))
{
pLine[i] = bNext;
//iChOffset++; // just replicate
i++;
j++;
}
}
else if (bMark == -128)
{
// noop
iChOffset++;
}
}
}
void CIffIlbm::OnChunk(CIffChunk *pChunk, CMemoryMappedFile &pFile)
{
// "raw" data of the chunk,
// locate by offset
uint8_t *pChunkData = CIffContainer::GetViewByOffset(pChunk->m_iOffset, pFile);
// suitable handling for chunk data..
if (pChunk->m_iChunkID == MakeTag("BMHD"))
{
// BMHD bitmap header chunk:
// should be first in file (according to spec)
// and needed by later processing of data
ParseBitmapHeader(pChunkData, pChunk);
}
else if (pChunk->m_iChunkID == MakeTag("CMAP"))
{
// CMAP color map chunk
m_lCmapCount = (pChunk->m_iChunkSize/sizeof(ColorRegister));
m_pCmap = new ColorRegister[m_lCmapCount];
// bytes only, copy as-is: no need for byteswap
::memcpy(m_pCmap, pChunkData, m_lCmapCount*sizeof(ColorRegister));
}
else if (pChunk->m_iChunkID == MakeTag("GRAB"))
{
// GRAB "hotspot" position (optional)
// (e.g. brush center)
Point2D *pPt = (Point2D*)pChunkData;
m_Pt2d.x = Swap2(pPt->x);
m_Pt2d.y = Swap2(pPt->y);
}
else if (pChunk->m_iChunkID == MakeTag("DEST"))
{
// DEST (optional)
DestMerge *pDst = (DestMerge*)pChunkData;
m_DestMerge.depth = pDst->depth;
m_DestMerge.pad1 = pDst->pad1; // padding, not necessary
m_DestMerge.planePick = Swap2(pDst->planePick);
m_DestMerge.planeOnOff = Swap2(pDst->planeOnOff);
m_DestMerge.planeMask = Swap2(pDst->planeMask);
}
else if (pChunk->m_iChunkID == MakeTag("CRNG"))
{
// CRNG (optional), "nonstandard"
// used by e.g. EA Deluxe Paint
CRange *pRange = (CRange*)pChunkData;
m_Range.pad1 = Swap2(pRange->pad1); // padding, not necessary
m_Range.rate = Swap2(pRange->rate);
m_Range.active = Swap2(pRange->active);
m_Range.low = pRange->low;
m_Range.high = pRange->high;
}
else if (pChunk->m_iChunkID == MakeTag("CCRT"))
{
// CCRT (optional)
// (Color Cycling Range and Timing)
CycleInfo *pCcrt = (CycleInfo*)pChunkData;
m_CycleInfo.direction = Swap2(pCcrt->direction);
m_CycleInfo.start = pCcrt->start;
m_CycleInfo.end = pCcrt->end;
m_CycleInfo.seconds = Swap4(pCcrt->seconds);
m_CycleInfo.microseconds = Swap4(pCcrt->microseconds);
m_CycleInfo.pad = Swap2(pCcrt->pad); // padding, not necessary
}
else if (pChunk->m_iChunkID == MakeTag("SPRT"))
{
// SPRT (optional),
// when image intended as a sprite:
// "Z"-plane order of sprite (0 foremost)
m_SpriteOrder = Swap2((*(SpritePrecedence*)pChunkData));
}
else if (pChunk->m_iChunkID == MakeTag("CAMG"))
{
// CAMG (optional),
// Amiga "viewport mode"
// e.g. "dual playfield", "hold and modify"
m_lViewPortMode = Swap4((*((LONG*)pChunkData)));
}
else if (pChunk->m_iChunkID == MakeTag("BODY"))
{
// BODY raster body chunk
// content is concatenation of scan lines
ParseBody(pChunkData, pChunk);
}
}
//////////////////// public methods
CIffIlbm::CIffIlbm(void)
: CIffContainer()
, m_File()
, m_pCmap(nullptr)
{
}
CIffIlbm::~CIffIlbm(void)
{
if (m_pCmap != nullptr)
{
delete m_pCmap;
m_pCmap = nullptr;
}
m_File.Destroy();
}
bool CIffIlbm::ParseFile(LPCTSTR szPathName)
{
if (m_File.Create(szPathName) == false)
{
return false;
}
if (ParseIffFile(m_File) == nullptr)
{
return false;
}
return true;
}