/* libhpojip -- HP OfficeJet image-processing library. */ /* Copyright (C) 1995-2002 HP Company * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * is provided AS IS, WITHOUT ANY WARRANTY; without even the implied * warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and * NON-INFRINGEMENT. See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. * * In addition, as a special exception, HP Company * gives permission to link the code of this program with any * version of the OpenSSL library which is distributed under a * license identical to that listed in the included LICENSE.OpenSSL * file, and distribute linked combinations including the two. * You must obey the GNU General Public License in all respects * for all of the code used other than OpenSSL. If you modify * this file, you may extend this exception to your version of the * file, but you are not obligated to do so. If you do not wish to * do so, delete this exception statement from your version. */ /* Original author: Mark Overton and others. * * Ported to Linux by David Paschal. */ /******************************************************************************\ * * xcrop.c - Crops all four sides of the input image * ****************************************************************************** * * Name of Global Jump-Table: * * cropTbl * * Items in aXformInfo array passed into setXformSpec: * * aXformInfo[IP_CROP_LEFT ] = left: # of pixels to remove from left side * aXformInfo[IP_CROP_RIGHT ] = right: # of pixels to remove from right side * aXformInfo[IP_CROP_TOP ] = top: # of rows to remove from top * aXformInfo[IP_CROP_MAXOUTROWS] = maxOutRows: max # of rows to output * * Any (or even all) of the above values may be zero. If maxOutRows is * zero, then an unlimited number of rows can be output. * * Capabilities and Limitations: * * Crops all four sides of the image. * The image data must be fixed-length rows of uncompressed pixels. * For bilevel data, the "left" value is changed to the nearest multiple * of 8, and the "right" value is changed so the resulting row-width * does not change. * If all crop-amounts above are 0, this xform becomes merely a pass-thru. * * Default Input Traits, and Output Traits: * * trait default input output * ------------------- --------------------- ------------------------ * iPixelsPerRow * used input width - horiz crop * iBitsPerPixel * passed into output same as default input * iComponentsPerPixel passed into output same as default input * lHorizDPI passed into output same as default input * lVertDPI passed into output same as default input * lNumRows used if known output height, if input known * iNumPages passed into output same as default input * iPageNum passed into output same as default input * * Above, a "*" by an item indicates it must be valid (not negative). * \******************************************************************************/ #include "hpip.h" #include "ipdefs.h" #include "string.h" /* for memset and memcpy */ #if 0 #include "stdio.h" #include #define PRINT(msg,arg1,arg2) \ _ftprintf(stderr, msg, (int)arg1, (int)arg2) #else #define PRINT(msg,arg1,arg2) #endif #define CHECK_VALUE 0x4ba1dace typedef struct { IP_IMAGE_TRAITS traits; /* traits of the input image */ DWORD dwLeft, dwRight; /* # pixels to crop, left and right sides */ DWORD dwTop; /* # rows to crop from top */ DWORD dwMaxOutRows; /* max # rows to output */ DWORD dwInBytesPerRow; /* # bytes in each input row */ DWORD dwOutBytesPerRow; /* # bytes in each output row */ DWORD dwLeftCropBytes; /* # bytes to toss from left side of each row */ DWORD dwInRows; /* number of rows input so far */ DWORD dwOutRows; /* number of rows output so far */ DWORD dwInNextPos; /* file pos for subsequent input */ DWORD dwOutNextPos; /* file pos for subsequent output */ DWORD dwValidChk; /* struct validity check value */ } CROP_INST, *PCROP_INST; /*****************************************************************************\ * * crop_openXform - Creates a new instance of the transformer * ***************************************************************************** * * This returns a handle for the new instance to be passed into * all subsequent calls. * * Return value: IP_DONE=success; IP_FATAL_ERROR=misc error. * \*****************************************************************************/ static WORD crop_openXform ( IP_XFORM_HANDLE *pXform) /* out: returned handle */ { PCROP_INST g; INSURE (pXform != NULL); IP_MEM_ALLOC (sizeof(CROP_INST), g); *pXform = g; memset (g, 0, sizeof(CROP_INST)); g->dwValidChk = CHECK_VALUE; return IP_DONE; fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * crop_setDefaultInputTraits - Specifies default input image traits * ***************************************************************************** * * The header of the file-type handled by the transform probably does * not include *all* the image traits we'd like to know. Those not * specified in the file-header are filled in from info provided by * this routine. * * Return value: IP_DONE=success; IP_FATAL_ERROR=misc error. * \*****************************************************************************/ static WORD crop_setDefaultInputTraits ( IP_XFORM_HANDLE hXform, /* in: handle for xform */ PIP_IMAGE_TRAITS pTraits) /* in: default image traits */ { PCROP_INST g; HANDLE_TO_PTR (hXform, g); /* insure that traits we care about are known */ INSURE (pTraits->iPixelsPerRow>0 && pTraits->iBitsPerPixel>0); g->traits = *pTraits; /* a structure copy */ return IP_DONE; fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * crop_setXformSpec - Provides xform-specific information * \*****************************************************************************/ static WORD crop_setXformSpec ( IP_XFORM_HANDLE hXform, /* in: handle for xform */ DWORD_OR_PVOID aXformInfo[]) /* in: xform information */ { PCROP_INST g; HANDLE_TO_PTR (hXform, g); g->dwLeft = aXformInfo[IP_CROP_LEFT].dword; g->dwRight = aXformInfo[IP_CROP_RIGHT].dword; g->dwTop = aXformInfo[IP_CROP_TOP].dword; g->dwMaxOutRows = aXformInfo[IP_CROP_MAXOUTROWS].dword; if (g->dwMaxOutRows == 0) g->dwMaxOutRows = 0x7ffffffful; /* 0 -> infinite */ return IP_DONE; fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * crop_getHeaderBufSize- Returns size of input buf needed to hold header * \*****************************************************************************/ static WORD crop_getHeaderBufSize ( IP_XFORM_HANDLE hXform, /* in: handle for xform */ DWORD *pdwInBufLen) /* out: buf size for parsing header */ { /* since input is raw pixels, there is no header, so set it to zero */ *pdwInBufLen = 0; return IP_DONE; } /*****************************************************************************\ * * crop_getActualTraits - Parses header, and returns input & output traits * \*****************************************************************************/ static WORD crop_getActualTraits ( IP_XFORM_HANDLE hXform, /* in: handle for xform */ DWORD dwInputAvail, /* in: # avail bytes in input buf */ PBYTE pbInputBuf, /* in: ptr to input buffer */ PDWORD pdwInputUsed, /* out: # bytes used from input buf */ PDWORD pdwInputNextPos,/* out: file-pos to read from next */ PIP_IMAGE_TRAITS pInTraits, /* out: input image traits */ PIP_IMAGE_TRAITS pOutTraits) /* out: output image traits */ { PCROP_INST g; int left, right, shift; int inWidth, outWidth; int bpp; long actualOut, maxOut; HANDLE_TO_PTR (hXform, g); /* Since there is no header, we'll report no usage of input */ *pdwInputUsed = 0; *pdwInputNextPos = 0; /* Compute the crop info */ bpp = g->traits.iBitsPerPixel; left = g->dwLeft; right = g->dwRight; inWidth = g->traits.iPixelsPerRow; outWidth = inWidth - left - right; INSURE (outWidth >= 0); if (bpp == 1) { /* shift to start at nearest byte boundary */ shift = ((left+4) & ~7) - left; left += shift; /* this is now a multiple of 8 */ right += shift; } g->dwInBytesPerRow = (bpp*inWidth + 7) / 8; g->dwOutBytesPerRow = (bpp*outWidth + 7) / 8; g->dwLeftCropBytes = (bpp*left + 7) / 8; /* Report the traits */ *pInTraits = g->traits; /* structure copies */ *pOutTraits = g->traits; pOutTraits->iPixelsPerRow = outWidth; /* compute the output lNumRows, if possible */ if (pInTraits->lNumRows > 0) { maxOut = g->dwMaxOutRows; actualOut = pInTraits->lNumRows - (long)g->dwTop; INSURE (actualOut >= 0); pOutTraits->lNumRows = actualOutdwInBytesPerRow; *pdwMinOutBufLen = g->dwOutBytesPerRow; return IP_DONE; fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * crop_convert - Converts one row * \*****************************************************************************/ static WORD crop_convert ( IP_XFORM_HANDLE hXform, DWORD dwInputAvail, /* in: # avail bytes in in-buf */ PBYTE pbInputBuf, /* in: ptr to in-buffer */ PDWORD pdwInputUsed, /* out: # bytes used from in-buf */ PDWORD pdwInputNextPos, /* out: file-pos to read from next */ DWORD dwOutputAvail, /* in: # avail bytes in out-buf */ PBYTE pbOutputBuf, /* in: ptr to out-buffer */ PDWORD pdwOutputUsed, /* out: # bytes written in out-buf */ PDWORD pdwOutputThisPos) /* out: file-pos to write the data */ { PCROP_INST g; DWORD dwOutBytes; HANDLE_TO_PTR (hXform, g); /**** Check if we were told to flush ****/ if (pbInputBuf == NULL) { PRINT (_T("crop_convert: Told to flush.\n"), 0, 0); *pdwInputUsed = *pdwOutputUsed = 0; *pdwInputNextPos = g->dwInNextPos; *pdwOutputThisPos = g->dwOutNextPos; return IP_DONE; } /**** Check if we should discard the row (vertical cropping) ****/ dwOutBytes = (g->dwInRows < g->dwTop || g->dwOutRows >= g->dwMaxOutRows) ? 0 : g->dwOutBytesPerRow; /**** Output a Row ****/ INSURE (dwInputAvail >= g->dwInBytesPerRow); INSURE (dwOutputAvail >= dwOutBytes); if (dwOutBytes > 0) { memcpy (pbOutputBuf, pbInputBuf+g->dwLeftCropBytes, dwOutBytes); g->dwOutRows += 1; } g->dwInRows += 1; *pdwInputUsed = g->dwInBytesPerRow; g->dwInNextPos += g->dwInBytesPerRow; *pdwInputNextPos = g->dwInNextPos; *pdwOutputUsed = dwOutBytes; *pdwOutputThisPos = g->dwOutNextPos; g->dwOutNextPos += dwOutBytes; return IP_CONSUMED_ROW | IP_PRODUCED_ROW | IP_READY_FOR_DATA; fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * crop_insertedData - client inserted into our output stream * \*****************************************************************************/ static WORD crop_insertedData ( IP_XFORM_HANDLE hXform, DWORD dwNumBytes) { fatalBreakPoint (); return IP_FATAL_ERROR; /* must never be called (can't insert data) */ } /*****************************************************************************\ * * crop_newPage - Tells us to flush this page, and start a new page * \*****************************************************************************/ static WORD crop_newPage ( IP_XFORM_HANDLE hXform) { PCROP_INST g; HANDLE_TO_PTR (hXform, g); /* todo: return fatal error if convert is called again? */ return IP_DONE; /* can't insert page-breaks, so ignore this call */ fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * crop_closeXform - Destroys this instance * \*****************************************************************************/ static WORD crop_closeXform (IP_XFORM_HANDLE hXform) { PCROP_INST g; HANDLE_TO_PTR (hXform, g); g->dwValidChk = 0; IP_MEM_FREE (g); /* free memory for the instance */ return IP_DONE; fatal_error: return IP_FATAL_ERROR; } /*****************************************************************************\ * * cropTbl - Jump-table for transform driver * \*****************************************************************************/ IP_XFORM_TBL cropTbl = { crop_openXform, crop_setDefaultInputTraits, crop_setXformSpec, crop_getHeaderBufSize, crop_getActualTraits, crop_getActualBufSizes, crop_convert, crop_newPage, crop_insertedData, crop_closeXform }; /* End of File */