static ilError _ilDecompG3Init(
ilDecompG3G4PrivPtr pPriv,
ilImageInfo *pSrcImage,
ilImageInfo *pDstImage
)
{
/* Allocate space for Reference line, needed for 2 dimensional coding */
pPriv->gpRefLine = (ilPtr)IL_MALLOC(pPriv->nDstLineBytes );
if (!pPriv->gpRefLine)
return IL_ERROR_MALLOC;
return IL_OK;
}
/* Realloc (or alloc the first time) the pixel buffer for plane "plane" of the
compressed image "*pImage", so that its "bufferSize" is a minimum of
"minNewSize" bytes in size.
*/
IL_PRIVATE ilBool _ilReallocCompressedBuffer (
ilImageInfo *pImage,
unsigned int plane,
unsigned long minNewSize
)
{
register ilImagePlaneInfo *pPlane;
pPlane = &pImage->plane[plane];
pPlane->bufferSize = minNewSize + 10000; /* A GUESS - DO SOMETHING SMARTER !!!!! */
if (!pPlane->pPixels) pPlane->pPixels = (ilPtr)IL_MALLOC (pPlane->bufferSize);
else pPlane->pPixels = (ilPtr)IL_REALLOC (pPlane->pPixels, pPlane->bufferSize);
if (!pPlane->pPixels) {
pPlane->bufferSize = 0;
return FALSE;
}
return TRUE;
}
/* Execute() function for ilInsertCompressedCopyFilter() to copy compressed images.
Copies one strip of compressed data.
*/
static ilError ilCopyCompressedExecute (
register ilExecuteData *pData,
long dstLine,
long *pNLines
)
{
register ilImagePlaneInfo *pSrcPlane, *pDstPlane;
long nBytes, dstOffset, requiredBufferSize;
nBytes = pData->compressed.nBytesToRead; /* # of bytes to write */
pSrcPlane = &pData->pSrcImage->plane[0];
if (!pSrcPlane->pPixels || (nBytes <= 0)) /* nothing to copy; exit */
return IL_OK;
dstOffset = *pData->compressed.pDstOffset; /* byte offset into dst buffer */
pDstPlane = &pData->pDstImage->plane[0];
requiredBufferSize = nBytes + dstOffset; /* # bytes needed in dst buffer */
/* Check for space in output buffer; realloc/malloc if not enough */
if (requiredBufferSize > pDstPlane->bufferSize) {
pDstPlane->pPixels = (pDstPlane->pPixels) ?
(ilPtr)IL_REALLOC (pDstPlane->pPixels, requiredBufferSize) :
(ilPtr)IL_MALLOC (requiredBufferSize);
if (!pDstPlane->pPixels) {
pDstPlane->bufferSize = 0;
return IL_ERROR_MALLOC;
}
pDstPlane->bufferSize = requiredBufferSize;
}
/* Copy nBytes from src to dst buffer, using offsets from *pData */
bcopy ((char *)(pSrcPlane->pPixels + pData->compressed.srcOffset),
(char *)(pDstPlane->pPixels + dstOffset), nBytes);
*pData->compressed.pNBytesWritten = nBytes;
return IL_OK;
}
