Initial import of the CDE 2.1.30 sources from the Open Group.
This commit is contained in:
Peter Howkins
248
cde/lib/DtHelp/il/ilcomppackbits.c
Normal file
248
cde/lib/DtHelp/il/ilcomppackbits.c
Normal file
@@ -0,0 +1,248 @@
|
||||
/* $XConsortium: ilcomppackbits.c /main/3 1995/10/23 15:42:43 rswiston $ */
|
||||
/**---------------------------------------------------------------------
|
||||
***
|
||||
*** (c)Copyright 1991 Hewlett-Packard Co.
|
||||
***
|
||||
*** RESTRICTED RIGHTS LEGEND
|
||||
*** Use, duplication, or disclosure by the U.S. Government is subject to
|
||||
*** restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in
|
||||
*** Technical Data and Computer Software clause in DFARS 252.227-7013.
|
||||
*** Hewlett-Packard Company
|
||||
*** 3000 Hanover Street
|
||||
*** Palo Alto, CA 94304 U.S.A.
|
||||
*** Rights for non-DOD U.S. Government Departments and Agencies are as set
|
||||
*** forth in FAR 52.227-19(c)(1,2).
|
||||
***
|
||||
***-------------------------------------------------------------------*/
|
||||
|
||||
#include "ilint.h"
|
||||
#include "ilpipelem.h"
|
||||
#include "ilcompress.h"
|
||||
#include "ilerrors.h"
|
||||
|
||||
|
||||
/* ========================================================================
|
||||
Compression private data structure definition
|
||||
======================================================================== */
|
||||
|
||||
typedef struct {
|
||||
int stripHeight;
|
||||
int height;
|
||||
int width;
|
||||
int widthbytes;
|
||||
int beingRecalled;
|
||||
ilBool firstStrip;
|
||||
} ilCompPBPrivRec, *ilCompPBPrivPtr;
|
||||
|
||||
|
||||
|
||||
/* ========================================================================
|
||||
|
||||
-------------------- ilComppackbitsInit -------------------
|
||||
|
||||
======================================================================== */
|
||||
|
||||
static ilError ilComppackbitsInit(
|
||||
ilCompPBPrivPtr pPrivate,
|
||||
ilImageInfo *pSrcImage,
|
||||
ilImageInfo *pDstImage
|
||||
)
|
||||
{
|
||||
pPrivate->firstStrip = TRUE;
|
||||
return IL_OK;
|
||||
}
|
||||
/* End ilComppackbitsInit() */
|
||||
|
||||
|
||||
|
||||
/* ========================================================================
|
||||
|
||||
-------------------- ilComppackbitsExecute() -------------------
|
||||
|
||||
======================================================================== */
|
||||
|
||||
static ilError ilComppackbitsExecute(
|
||||
ilExecuteData *pData,
|
||||
unsigned long dstLine,
|
||||
unsigned long *pNLines
|
||||
)
|
||||
{
|
||||
|
||||
|
||||
#define PB_MAX_BUFFER_WRITE 140 /* max bytes written after check for room in compressed buffer */
|
||||
|
||||
unsigned long nBytes = 0; /* Number of source image bytes to unpack for current strip */
|
||||
unsigned long nLines; /* Number of lines per source image strip */
|
||||
register ilPtr pSrcByte; /* Pointer to source image data first byte */
|
||||
ilPtr pSrcLine; /* Pointer to source image data first byte of line */
|
||||
register ilPtr pDstByte; /* Pointer to destination image data */
|
||||
ilPtr pDstBufferEnd; /* Ptr to byte "PB_MAX_BUFFER_WRITE" from end of compressed buffer */
|
||||
unsigned long srcNBytes; /* Number of source image bytes per row */
|
||||
ilCompPBPrivPtr pPriv; /* Pointer to private image data */
|
||||
ilImagePlaneInfo *pSrcPlane, *pDstPlane;
|
||||
|
||||
long offset; /* difference between current dst image address pointer and the
|
||||
start address of the dst image buffer */
|
||||
long length; /* number of bytes written to dst image */
|
||||
register int count; /* run count value */
|
||||
register int start, j; /* indices into source data */
|
||||
register int nBytesM1; /* bytes per row of data minus one */
|
||||
|
||||
/* ========================================================================
|
||||
Set up for execution of compression algorithm code
|
||||
======================================================================== */
|
||||
|
||||
pPriv = (ilCompPBPrivPtr) pData->pPrivate;
|
||||
|
||||
nLines = *pNLines;
|
||||
if (nLines <= 0) return IL_OK;
|
||||
|
||||
pSrcPlane = &pData->pSrcImage->plane[0];
|
||||
srcNBytes = pSrcPlane->nBytesPerRow;
|
||||
pSrcLine = pSrcPlane->pPixels + pData->srcLine * srcNBytes;
|
||||
|
||||
/* allocate destination buffer space */
|
||||
if (pPriv->firstStrip) {
|
||||
if (!_ilReallocCompressedBuffer (pData->pDstImage, 0, PB_MAX_BUFFER_WRITE))
|
||||
return IL_ERROR_MALLOC;
|
||||
pPriv->firstStrip = FALSE;
|
||||
}
|
||||
|
||||
pDstPlane = &pData->pDstImage->plane[0];
|
||||
pDstBufferEnd = pDstPlane->pPixels + (pDstPlane->bufferSize - PB_MAX_BUFFER_WRITE);
|
||||
|
||||
/* exit. Pointer pPixels must not be NULL */
|
||||
if (!pDstPlane->pPixels) return IL_ERROR_NULL_COMPRESSED_IMAGE;
|
||||
|
||||
pDstByte = pDstPlane->pPixels + *pData->compressed.pDstOffset;
|
||||
|
||||
/* write out image, one strip at a time */
|
||||
nBytesM1 = pPriv->widthbytes - 1;
|
||||
|
||||
while ( nLines-- > 0 ) {
|
||||
|
||||
pSrcByte = pSrcLine;
|
||||
|
||||
start = 0;
|
||||
j = 0;
|
||||
|
||||
while (j <= nBytesM1) {
|
||||
|
||||
start = j;
|
||||
|
||||
if ( pSrcByte[j] == pSrcByte[j+1] ) { /* repeat run */
|
||||
|
||||
while ((pSrcByte[j] == pSrcByte[j+1]) && (j < nBytesM1) && ((j-start) < 127) ) j++;
|
||||
|
||||
/* output buffer size handling code */
|
||||
if (pDstByte >= pDstBufferEnd) {
|
||||
offset = pDstByte - pDstPlane->pPixels;
|
||||
if (!_ilReallocCompressedBuffer (pData->pDstImage, 0, offset + PB_MAX_BUFFER_WRITE))
|
||||
return IL_ERROR_MALLOC;
|
||||
pDstByte = pDstPlane->pPixels + offset;
|
||||
pDstBufferEnd = pDstPlane->pPixels + (pDstPlane->bufferSize - PB_MAX_BUFFER_WRITE);
|
||||
}
|
||||
|
||||
j++;
|
||||
count = 1 - (j-start);
|
||||
*pDstByte++ = count;
|
||||
*pDstByte++ = pSrcByte[j-1];
|
||||
|
||||
}
|
||||
else { /* literal run */
|
||||
|
||||
while ( (pSrcByte[j] != pSrcByte[j+1]) && (j <= nBytesM1) && ((j-start) < 128) ) j++;
|
||||
|
||||
/* output buffer size handling code */
|
||||
if (pDstByte >= pDstBufferEnd) {
|
||||
offset = pDstByte - pDstPlane->pPixels;
|
||||
if (!_ilReallocCompressedBuffer (pData->pDstImage, 0, offset + PB_MAX_BUFFER_WRITE))
|
||||
return IL_ERROR_MALLOC;
|
||||
pDstByte = pDstPlane->pPixels + offset;
|
||||
pDstBufferEnd = pDstPlane->pPixels + (pDstPlane->bufferSize - PB_MAX_BUFFER_WRITE);
|
||||
}
|
||||
|
||||
count = j-start - 1;
|
||||
*pDstByte++ = count;
|
||||
do {
|
||||
*pDstByte++ = pSrcByte[start++];
|
||||
} while (--count >= 0);
|
||||
|
||||
}
|
||||
} /* end row loop */
|
||||
|
||||
pSrcLine += srcNBytes;
|
||||
} /* end while */
|
||||
|
||||
|
||||
/* Return the number of bytes written, = dst ptr - beginning of dst buffer */
|
||||
*pData->compressed.pNBytesWritten = pDstByte - (pDstPlane->pPixels + *pData->compressed.pDstOffset);
|
||||
return IL_OK;
|
||||
}
|
||||
|
||||
|
||||
|
||||
/* ========================================================================
|
||||
|
||||
-------------------- ilCompressPackbits --------------------
|
||||
|
||||
======================================================================== */
|
||||
|
||||
IL_PRIVATE ilBool _ilCompressPackbits (
|
||||
ilPipe pipe,
|
||||
ilPipeInfo *pinfo,
|
||||
ilImageDes *pimdes,
|
||||
ilImageFormat *pimformat,
|
||||
ilSrcElementData *pSrcData
|
||||
)
|
||||
{
|
||||
ilDstElementData dstdata;
|
||||
ilCompPBPrivPtr pPriv;
|
||||
ilImageDes des;
|
||||
ilBool bitPerPixel;
|
||||
|
||||
/* Validate that image is bit/pixel, or if not bit, convert to byte if fits. */
|
||||
if (pimdes->nSamplesPerPixel != 1)
|
||||
return ilDeclarePipeInvalid (pipe, IL_ERROR_IMAGE_TYPE);
|
||||
if (pimformat->nBitsPerSample[0] == 1)
|
||||
bitPerPixel = TRUE;
|
||||
else {
|
||||
bitPerPixel = FALSE;
|
||||
if (pimformat->nBitsPerSample[0] != 8)
|
||||
if (!ilConvert (pipe, (ilImageDes *)NULL, IL_FORMAT_BYTE, 0, (ilPtr)NULL))
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/* dstdata describes strips being output to next pipe element */
|
||||
dstdata.producerObject = (ilObject) NULL;
|
||||
des = *pimdes;
|
||||
des.compression = IL_PACKBITS;
|
||||
dstdata.pDes = &des;
|
||||
dstdata.pFormat = (bitPerPixel) ? IL_FORMAT_BIT : IL_FORMAT_BYTE;
|
||||
dstdata.width = pinfo->width;
|
||||
dstdata.height = pinfo->height;
|
||||
dstdata.stripHeight = pSrcData->stripHeight;
|
||||
dstdata.constantStrip = pSrcData->constantStrip;
|
||||
dstdata.pPalette = pinfo->pPalette;
|
||||
dstdata.pCompData = (ilPtr)NULL;
|
||||
|
||||
|
||||
/* ========================================================================
|
||||
Add the filter to the pipeline
|
||||
======================================================================== */
|
||||
|
||||
pPriv = (ilCompPBPrivPtr) ilAddPipeElement(pipe, IL_FILTER, sizeof(ilCompPBPrivRec), 0, pSrcData, &dstdata,
|
||||
ilComppackbitsInit, IL_NPF, IL_NPF, ilComppackbitsExecute, 0);
|
||||
|
||||
if (!pPriv) return FALSE; /* EXIT */
|
||||
|
||||
/* save private date */
|
||||
pPriv->stripHeight = dstdata.stripHeight;
|
||||
pPriv->height = pinfo->height;
|
||||
pPriv->width = pinfo->width;
|
||||
pPriv->widthbytes = (bitPerPixel) ? (pPriv->width + 7) / 8 : pPriv->width;
|
||||
pPriv->beingRecalled = FALSE;
|
||||
return TRUE;
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user