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imagemagick/coders/sct.c

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Import Upstream version 6.9.11.60
2023-02-03 21:16:55 +08:00
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% SSSSS CCCC TTTTT %
% SS C T %
% SSS C T %
% SS C T %
% SSSSS CCCC T %
% %
% %
% Read Scitex HandShake Image Format %
% %
% Software Design %
% Cristy %
% July 1992 %
% %
% %
% Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% https://imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/module.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/pixel-accessor.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/string-private.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s S C T %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsSCT() returns MagickTrue if the image format type, identified by the
% magick string, is SCT.
%
% The format of the IsSCT method is:
%
% MagickBooleanType IsSCT(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o magick: compare image format pattern against these bytes.
%
% o length: Specifies the length of the magick string.
%
*/
static MagickBooleanType IsSCT(const unsigned char *magick,const size_t length)
{
if (length < 2)
return(MagickFalse);
if (LocaleNCompare((const char *) magick,"CT",2) == 0)
return(MagickTrue);
return(MagickFalse);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d S C T I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadSCTImage() reads a Scitex image file and returns it. It allocates
% the memory necessary for the new Image structure and returns a pointer to
% the new image.
%
% The format of the ReadSCTImage method is:
%
% Image *ReadSCTImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadSCTImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
char
magick[2];
Image
*image;
int
c;
MagickBooleanType
status;
MagickRealType
height,
width;
Quantum
pixel;
IndexPacket
*indexes;
ssize_t
i,
x;
PixelPacket
*q;
ssize_t
count,
y;
unsigned char
buffer[768];
size_t
separations,
separations_mask,
units;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickCoreSignature);
image=AcquireImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
/*
Read control block.
*/
memset(magick,0,sizeof(magick));
memset(buffer,0,sizeof(buffer));
count=ReadBlob(image,80,buffer);
(void) count;
count=ReadBlob(image,2,(unsigned char *) magick);
if ((LocaleNCompare((char *) magick,"CT",2) != 0) &&
(LocaleNCompare((char *) magick,"LW",2) != 0) &&
(LocaleNCompare((char *) magick,"BM",2) != 0) &&
(LocaleNCompare((char *) magick,"PG",2) != 0) &&
(LocaleNCompare((char *) magick,"TX",2) != 0))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
if ((LocaleNCompare((char *) magick,"LW",2) == 0) ||
(LocaleNCompare((char *) magick,"BM",2) == 0) ||
(LocaleNCompare((char *) magick,"PG",2) == 0) ||
(LocaleNCompare((char *) magick,"TX",2) == 0))
ThrowReaderException(CoderError,"OnlyContinuousTonePictureSupported");
count=ReadBlob(image,174,buffer);
count=ReadBlob(image,768,buffer);
/*
Read paramter block.
*/
units=1UL*ReadBlobByte(image);
if (units == 0)
image->units=PixelsPerCentimeterResolution;
separations=1UL*ReadBlobByte(image);
separations_mask=ReadBlobMSBShort(image);
count=ReadBlob(image,14,buffer);
buffer[14]='\0';
height=StringToDouble((char *) buffer,(char **) NULL);
count=ReadBlob(image,14,buffer);
width=StringToDouble((char *) buffer,(char **) NULL);
count=ReadBlob(image,12,buffer);
buffer[12]='\0';
image->rows=StringToUnsignedLong((char *) buffer);
count=ReadBlob(image,12,buffer);
image->columns=StringToUnsignedLong((char *) buffer);
count=ReadBlob(image,200,buffer);
count=ReadBlob(image,768,buffer);
if (separations_mask == 0x0f)
SetImageColorspace(image,CMYKColorspace);
if ((image->columns < 1) || (image->rows < 1) ||
(width < MagickEpsilon) || (height < MagickEpsilon))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
image->x_resolution=1.0*image->columns/width;
image->y_resolution=1.0*image->rows/height;
if (image_info->ping != MagickFalse)
{
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
status=SetImageExtent(image,image->columns,image->rows);
if (status == MagickFalse)
{
InheritException(exception,&image->exception);
return(DestroyImageList(image));
}
/*
Convert SCT raster image to pixel packets.
*/
(void) SetImageBackgroundColor(image);
c=0;
for (y=0; y < (ssize_t) image->rows; y++)
{
for (i=0; i < (ssize_t) separations; i++)
{
q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
break;
indexes=GetAuthenticIndexQueue(image);
for (x=0; x < (ssize_t) image->columns; x++)
{
c=ReadBlobByte(image);
if (c == EOF)
break;
pixel=(Quantum) ScaleCharToQuantum((unsigned char) c);
if (image->colorspace == CMYKColorspace)
pixel=(Quantum) (QuantumRange-pixel);
switch (i)
{
case 0:
{
SetPixelRed(q,pixel);
SetPixelGreen(q,pixel);
SetPixelBlue(q,pixel);
break;
}
case 1:
{
SetPixelGreen(q,pixel);
break;
}
case 2:
{
SetPixelBlue(q,pixel);
break;
}
case 3:
{
if (image->colorspace == CMYKColorspace)
SetPixelBlack(indexes+x,pixel);
break;
}
}
q++;
}
if (x < (ssize_t) image->columns)
break;
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
if ((image->columns % 2) != 0)
(void) ReadBlobByte(image); /* pad */
}
if (i < (ssize_t) separations)
break;
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
if (EOFBlob(image) != MagickFalse)
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r S C T I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterSCTImage() adds attributes for the SCT image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterSCTImage method is:
%
% size_t RegisterSCTImage(void)
%
*/
ModuleExport size_t RegisterSCTImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("SCT");
entry->decoder=(DecodeImageHandler *) ReadSCTImage;
entry->magick=(IsImageFormatHandler *) IsSCT;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Scitex HandShake");
entry->magick_module=ConstantString("SCT");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r S C T I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterSCTImage() removes format registrations made by the
% SCT module from the list of supported formats.
%
% The format of the UnregisterSCTImage method is:
%
% UnregisterSCTImage(void)
%
*/
ModuleExport void UnregisterSCTImage(void)
{
(void) UnregisterMagickInfo("SCT");
}