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imagemagick/coders/pcx.c

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Import Upstream version 6.9.11.60
2023-02-03 21:16:55 +08:00
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% PPPP CCCC X X %
% P P C X X %
% PPPP C X %
% P C X X %
% P CCCC X X %
% %
% %
% Read/Write ZSoft IBM PC Paintbrush 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/attribute.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/color.h"
#include "magick/color-private.h"
#include "magick/colormap.h"
#include "magick/colorspace.h"
#include "magick/colorspace-private.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/memory-private.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/module.h"
/*
Typedef declarations.
*/
typedef struct _PCXInfo
{
unsigned char
identifier,
version,
encoding,
bits_per_pixel;
unsigned short
left,
top,
right,
bottom,
horizontal_resolution,
vertical_resolution;
unsigned char
reserved,
planes;
unsigned short
bytes_per_line,
palette_info,
horizontal_screensize,
vertical_screensize;
unsigned char
colormap_signature;
} PCXInfo;
/*
Forward declarations.
*/
static MagickBooleanType
WritePCXImage(const ImageInfo *,Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s D C X %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsDCX() returns MagickTrue if the image format type, identified by the
% magick string, is DCX.
%
% The format of the IsDCX method is:
%
% MagickBooleanType IsDCX(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 IsDCX(const unsigned char *magick,const size_t length)
{
if (length < 4)
return(MagickFalse);
if (memcmp(magick,"\261\150\336\72",4) == 0)
return(MagickTrue);
return(MagickFalse);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% I s P C X %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% IsPCX() returns MagickTrue if the image format type, identified by the
% magick string, is PCX.
%
% The format of the IsPCX method is:
%
% MagickBooleanType IsPCX(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 IsPCX(const unsigned char *magick,const size_t length)
{
if (length < 2)
return(MagickFalse);
if (memcmp(magick,"\012\002",2) == 0)
return(MagickTrue);
if (memcmp(magick,"\012\005",2) == 0)
return(MagickTrue);
return(MagickFalse);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d P C X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadPCXImage() reads a ZSoft IBM PC Paintbrush 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 ReadPCXImage method is:
%
% Image *ReadPCXImage(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 *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
#define ThrowPCXException(severity,tag) \
{ \
if (scanline != (unsigned char *) NULL) \
scanline=(unsigned char *) RelinquishMagickMemory(scanline); \
if (pixel_info != (MemoryInfo *) NULL) \
pixel_info=RelinquishVirtualMemory(pixel_info); \
if (page_table != (MagickOffsetType *) NULL) \
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table); \
ThrowReaderException(severity,tag); \
}
Image
*image;
int
bits,
id,
mask;
MagickBooleanType
status;
MagickOffsetType
offset,
*page_table;
MemoryInfo
*pixel_info;
PCXInfo
pcx_info;
IndexPacket
*indexes;
ssize_t
x;
PixelPacket
*q;
ssize_t
i;
unsigned char
*p,
*r;
size_t
one,
pcx_packets;
ssize_t
count,
y;
unsigned char
packet,
pcx_colormap[768],
*pixels,
*scanline;
/*
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);
}
/*
Determine if this a PCX file.
*/
page_table=(MagickOffsetType *) NULL;
scanline=(unsigned char *) NULL;
pixel_info=(MemoryInfo *) NULL;
if (LocaleCompare(image_info->magick,"DCX") == 0)
{
size_t
magic;
/*
Read the DCX page table.
*/
magic=ReadBlobLSBLong(image);
if (magic != 987654321)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
sizeof(*page_table));
if (page_table == (MagickOffsetType *) NULL)
ThrowPCXException(ResourceLimitError,"MemoryAllocationFailed");
for (id=0; id < 1024; id++)
{
page_table[id]=(MagickOffsetType) ReadBlobLSBLong(image);
if (page_table[id] == 0)
break;
}
}
if (page_table != (MagickOffsetType *) NULL)
{
offset=SeekBlob(image,(MagickOffsetType) page_table[0],SEEK_SET);
if (offset < 0)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
}
count=ReadBlob(image,1,&pcx_info.identifier);
for (id=1; id < 1024; id++)
{
int
bits_per_pixel;
/*
Verify PCX identifier.
*/
pcx_info.version=(unsigned char) ReadBlobByte(image);
if ((count != 1) || (pcx_info.identifier != 0x0a))
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
pcx_info.encoding=(unsigned char) ReadBlobByte(image);
bits_per_pixel=ReadBlobByte(image);
if (bits_per_pixel == -1)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
pcx_info.bits_per_pixel=(unsigned char) bits_per_pixel;
pcx_info.left=ReadBlobLSBShort(image);
pcx_info.top=ReadBlobLSBShort(image);
pcx_info.right=ReadBlobLSBShort(image);
pcx_info.bottom=ReadBlobLSBShort(image);
pcx_info.horizontal_resolution=ReadBlobLSBShort(image);
pcx_info.vertical_resolution=ReadBlobLSBShort(image);
if (EOFBlob(image) != MagickFalse)
ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
/*
Read PCX raster colormap.
*/
if ((pcx_info.right < pcx_info.left) || (pcx_info.bottom < pcx_info.top) ||
((pcx_info.bits_per_pixel != 1) && (pcx_info.bits_per_pixel != 2) &&
(pcx_info.bits_per_pixel != 4) && (pcx_info.bits_per_pixel != 8)))
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
image->columns=(size_t) (pcx_info.right-pcx_info.left)+1UL;
image->rows=(size_t) (pcx_info.bottom-pcx_info.top)+1UL;
image->depth=pcx_info.bits_per_pixel;
image->units=PixelsPerInchResolution;
image->x_resolution=(double) pcx_info.horizontal_resolution;
image->y_resolution=(double) pcx_info.vertical_resolution;
image->colors=16;
if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
if (image->scene >= (image_info->scene+image_info->number_scenes-1))
break;
if ((MagickSizeType) (image->columns*image->rows/255) > GetBlobSize(image))
ThrowPCXException(CorruptImageError,"InsufficientImageDataInFile");
status=SetImageExtent(image,image->columns,image->rows);
if (status == MagickFalse)
ThrowPCXException(image->exception.severity,image->exception.reason);
(void) SetImageBackgroundColor(image);
(void) memset(pcx_colormap,0,sizeof(pcx_colormap));
count=ReadBlob(image,3*image->colors,pcx_colormap);
if (count != (ssize_t) (3*image->colors))
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
pcx_info.reserved=(unsigned char) ReadBlobByte(image);
pcx_info.planes=(unsigned char) ReadBlobByte(image);
if (pcx_info.planes > 6)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
if ((pcx_info.bits_per_pixel*pcx_info.planes) >= 64)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
if (pcx_info.planes == 0)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
one=1;
if ((pcx_info.bits_per_pixel != 8) || (pcx_info.planes == 1))
if ((pcx_info.version == 3) || (pcx_info.version == 5) ||
((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
image->colors=(size_t) MagickMin(one << (1UL*
(pcx_info.bits_per_pixel*pcx_info.planes)),256UL);
if (AcquireImageColormap(image,image->colors) == MagickFalse)
ThrowPCXException(ResourceLimitError,"MemoryAllocationFailed");
if ((pcx_info.bits_per_pixel >= 8) && (pcx_info.planes != 1))
image->storage_class=DirectClass;
p=pcx_colormap;
for (i=0; i < (ssize_t) image->colors; i++)
{
image->colormap[i].red=ScaleCharToQuantum(*p++);
image->colormap[i].green=ScaleCharToQuantum(*p++);
image->colormap[i].blue=ScaleCharToQuantum(*p++);
}
pcx_info.bytes_per_line=ReadBlobLSBShort(image);
pcx_info.palette_info=ReadBlobLSBShort(image);
pcx_info.horizontal_screensize=ReadBlobLSBShort(image);
pcx_info.vertical_screensize=ReadBlobLSBShort(image);
for (i=0; i < 54; i++)
(void) ReadBlobByte(image);
/*
Read image data.
*/
if (HeapOverflowSanityCheckGetSize(image->rows,(size_t) pcx_info.bytes_per_line,&pcx_packets) != MagickFalse)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
if (HeapOverflowSanityCheckGetSize(pcx_packets,(size_t) pcx_info.planes,&pcx_packets) != MagickFalse)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
if ((size_t) (pcx_info.bits_per_pixel*pcx_info.planes*image->columns) > (pcx_packets*8U))
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
if ((MagickSizeType) (pcx_packets/32+128) > GetBlobSize(image))
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
scanline=(unsigned char *) AcquireQuantumMemory(MagickMax(image->columns,
pcx_info.bytes_per_line),MagickMax(pcx_info.planes,8)*sizeof(*scanline));
pixel_info=AcquireVirtualMemory(pcx_packets,2*sizeof(*pixels));
if ((scanline == (unsigned char *) NULL) ||
(pixel_info == (MemoryInfo *) NULL))
{
if (scanline != (unsigned char *) NULL)
scanline=(unsigned char *) RelinquishMagickMemory(scanline);
if (pixel_info != (MemoryInfo *) NULL)
pixel_info=RelinquishVirtualMemory(pixel_info);
ThrowPCXException(ResourceLimitError,"MemoryAllocationFailed");
}
(void) memset(scanline,0,(size_t) MagickMax(image->columns,
pcx_info.bytes_per_line)*MagickMax(pcx_info.planes,8)*sizeof(*scanline));
pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
(void) memset(pixels,0,(size_t) pcx_packets*(2*sizeof(*pixels)));
/*
Uncompress image data.
*/
p=pixels;
if (pcx_info.encoding == 0)
while (pcx_packets != 0)
{
packet=(unsigned char) ReadBlobByte(image);
if (EOFBlob(image) != MagickFalse)
ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
*p++=packet;
pcx_packets--;
}
else
while (pcx_packets != 0)
{
packet=(unsigned char) ReadBlobByte(image);
if (EOFBlob(image) != MagickFalse)
ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
if ((packet & 0xc0) != 0xc0)
{
*p++=packet;
pcx_packets--;
continue;
}
count=(ssize_t) (packet & 0x3f);
packet=(unsigned char) ReadBlobByte(image);
if (EOFBlob(image) != MagickFalse)
ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
for ( ; count != 0; count--)
{
*p++=packet;
pcx_packets--;
if (pcx_packets == 0)
break;
}
}
if (image->storage_class == DirectClass)
image->matte=pcx_info.planes > 3 ? MagickTrue : MagickFalse;
else
if ((pcx_info.version == 5) ||
((pcx_info.bits_per_pixel*pcx_info.planes) == 1))
{
/*
Initialize image colormap.
*/
if (image->colors > 256)
ThrowPCXException(CorruptImageError,"ColormapExceeds256Colors");
if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
{
/*
Monochrome colormap.
*/
image->colormap[0].red=(Quantum) 0;
image->colormap[0].green=(Quantum) 0;
image->colormap[0].blue=(Quantum) 0;
image->colormap[1].red=QuantumRange;
image->colormap[1].green=QuantumRange;
image->colormap[1].blue=QuantumRange;
}
else
if (image->colors > 16)
{
/*
256 color images have their color map at the end of the file.
*/
pcx_info.colormap_signature=(unsigned char) ReadBlobByte(image);
count=ReadBlob(image,3*image->colors,pcx_colormap);
p=pcx_colormap;
for (i=0; i < (ssize_t) image->colors; i++)
{
image->colormap[i].red=ScaleCharToQuantum(*p++);
image->colormap[i].green=ScaleCharToQuantum(*p++);
image->colormap[i].blue=ScaleCharToQuantum(*p++);
}
}
}
/*
Convert PCX raster image to pixel packets.
*/
for (y=0; y < (ssize_t) image->rows; y++)
{
p=pixels+(y*pcx_info.bytes_per_line*pcx_info.planes);
q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
break;
indexes=GetAuthenticIndexQueue(image);
r=scanline;
if (image->storage_class == DirectClass)
for (i=0; i < pcx_info.planes; i++)
{
r=scanline+i;
for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
{
switch (i)
{
case 0:
{
*r=(*p++);
break;
}
case 1:
{
*r=(*p++);
break;
}
case 2:
{
*r=(*p++);
break;
}
case 3:
default:
{
*r=(*p++);
break;
}
}
r+=pcx_info.planes;
}
}
else
if (pcx_info.planes > 1)
{
for (x=0; x < (ssize_t) image->columns; x++)
*r++=0;
for (i=0; i < pcx_info.planes; i++)
{
r=scanline;
for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
{
bits=(*p++);
for (mask=0x80; mask != 0; mask>>=1)
{
if (bits & mask)
*r|=1 << i;
r++;
}
}
}
}
else
switch (pcx_info.bits_per_pixel)
{
case 1:
{
ssize_t
bit;
for (x=0; x < ((ssize_t) image->columns-7); x+=8)
{
for (bit=7; bit >= 0; bit--)
*r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x00 : 0x01);
p++;
}
if ((image->columns % 8) != 0)
{
for (bit=7; bit >= (ssize_t) (8-(image->columns % 8)); bit--)
*r++=(unsigned char) ((*p) & (0x01 << bit) ? 0x00 : 0x01);
p++;
}
break;
}
case 2:
{
for (x=0; x < ((ssize_t) image->columns-3); x+=4)
{
*r++=(*p >> 6) & 0x3;
*r++=(*p >> 4) & 0x3;
*r++=(*p >> 2) & 0x3;
*r++=(*p) & 0x3;
p++;
}
if ((image->columns % 4) != 0)
{
for (i=3; i >= (ssize_t) (4-(image->columns % 4)); i--)
*r++=(unsigned char) ((*p >> (i*2)) & 0x03);
p++;
}
break;
}
case 4:
{
for (x=0; x < ((ssize_t) image->columns-1); x+=2)
{
*r++=(*p >> 4) & 0xf;
*r++=(*p) & 0xf;
p++;
}
if ((image->columns % 2) != 0)
*r++=(*p++ >> 4) & 0xf;
break;
}
case 8:
{
(void) memcpy(r,p,image->columns);
break;
}
default:
break;
}
/*
Transfer image scanline.
*/
r=scanline;
for (x=0; x < (ssize_t) image->columns; x++)
{
if (image->storage_class == PseudoClass)
SetPixelIndex(indexes+x,*r++);
else
{
SetPixelRed(q,ScaleCharToQuantum(*r++));
SetPixelGreen(q,ScaleCharToQuantum(*r++));
SetPixelBlue(q,ScaleCharToQuantum(*r++));
if (image->matte != MagickFalse)
SetPixelAlpha(q,ScaleCharToQuantum(*r++));
}
q++;
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
if (image->previous == (Image *) NULL)
{
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
}
if (image->storage_class == PseudoClass)
(void) SyncImage(image);
scanline=(unsigned char *) RelinquishMagickMemory(scanline);
pixel_info=RelinquishVirtualMemory(pixel_info);
if (EOFBlob(image) != MagickFalse)
{
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
break;
}
/*
Proceed to next image.
*/
if (image_info->number_scenes != 0)
if (image->scene >= (image_info->scene+image_info->number_scenes-1))
break;
if (page_table == (MagickOffsetType *) NULL)
break;
if (page_table[id] == 0)
break;
offset=SeekBlob(image,(MagickOffsetType) page_table[id],SEEK_SET);
if (offset < 0)
ThrowPCXException(CorruptImageError,"ImproperImageHeader");
count=ReadBlob(image,1,&pcx_info.identifier);
if ((count != 0) && (pcx_info.identifier == 0x0a))
{
/*
Allocate next image structure.
*/
AcquireNextImage(image_info,image);
if (GetNextImageInList(image) == (Image *) NULL)
{
status=MagickFalse;
break;
}
image=SyncNextImageInList(image);
status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
GetBlobSize(image));
if (status == MagickFalse)
break;
}
}
if (page_table != (MagickOffsetType *) NULL)
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
(void) CloseBlob(image);
if (status == MagickFalse)
return(DestroyImageList(image));
return(GetFirstImageInList(image));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r P C X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterPCXImage() adds attributes for the PCX 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 RegisterPCXImage method is:
%
% size_t RegisterPCXImage(void)
%
*/
ModuleExport size_t RegisterPCXImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("DCX");
entry->decoder=(DecodeImageHandler *) ReadPCXImage;
entry->encoder=(EncodeImageHandler *) WritePCXImage;
entry->seekable_stream=MagickTrue;
entry->magick=(IsImageFormatHandler *) IsDCX;
entry->description=ConstantString("ZSoft IBM PC multi-page Paintbrush");
entry->magick_module=ConstantString("PCX");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("PCX");
entry->decoder=(DecodeImageHandler *) ReadPCXImage;
entry->encoder=(EncodeImageHandler *) WritePCXImage;
entry->magick=(IsImageFormatHandler *) IsPCX;
entry->adjoin=MagickFalse;
entry->seekable_stream=MagickTrue;
entry->description=ConstantString("ZSoft IBM PC Paintbrush");
entry->magick_module=ConstantString("PCX");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r P C X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterPCXImage() removes format registrations made by the
% PCX module from the list of supported formats.
%
% The format of the UnregisterPCXImage method is:
%
% UnregisterPCXImage(void)
%
*/
ModuleExport void UnregisterPCXImage(void)
{
(void) UnregisterMagickInfo("DCX");
(void) UnregisterMagickInfo("PCX");
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e P C X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% WritePCXImage() writes an image in the ZSoft IBM PC Paintbrush file
% format.
%
% The format of the WritePCXImage method is:
%
% MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
%
%
*/
static MagickBooleanType PCXWritePixels(PCXInfo *pcx_info,
const unsigned char *pixels,Image *image)
{
const unsigned char
*q;
ssize_t
i,
x;
ssize_t
count;
unsigned char
packet,
previous;
q=pixels;
for (i=0; i < (ssize_t) pcx_info->planes; i++)
{
if (pcx_info->encoding == 0)
{
for (x=0; x < (ssize_t) pcx_info->bytes_per_line; x++)
(void) WriteBlobByte(image,(unsigned char) (*q++));
}
else
{
previous=(*q++);
count=1;
for (x=0; x < (ssize_t) (pcx_info->bytes_per_line-1); x++)
{
packet=(*q++);
if ((packet == previous) && (count < 63))
{
count++;
continue;
}
if ((count > 1) || ((previous & 0xc0) == 0xc0))
{
count|=0xc0;
(void) WriteBlobByte(image,(unsigned char) count);
}
(void) WriteBlobByte(image,previous);
previous=packet;
count=1;
}
if ((count > 1) || ((previous & 0xc0) == 0xc0))
{
count|=0xc0;
(void) WriteBlobByte(image,(unsigned char) count);
}
(void) WriteBlobByte(image,previous);
}
}
return (MagickTrue);
}
static MagickBooleanType WritePCXImage(const ImageInfo *image_info,Image *image)
{
MagickBooleanType
status;
MagickOffsetType
offset,
*page_table,
scene;
MemoryInfo
*pixel_info;
PCXInfo
pcx_info;
const IndexPacket
*indexes;
const PixelPacket
*p;
ssize_t
i,
x;
unsigned char
*q;
size_t
imageListLength,
length;
ssize_t
y;
unsigned char
*pcx_colormap,
*pixels;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickCoreSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == MagickFalse)
return(status);
(void) TransformImageColorspace(image,sRGBColorspace);
page_table=(MagickOffsetType *) NULL;
if ((LocaleCompare(image_info->magick,"DCX") == 0) ||
((GetNextImageInList(image) != (Image *) NULL) &&
(image_info->adjoin != MagickFalse)))
{
/*
Write the DCX page table.
*/
(void) WriteBlobLSBLong(image,0x3ADE68B1L);
page_table=(MagickOffsetType *) AcquireQuantumMemory(1024UL,
sizeof(*page_table));
if (page_table == (MagickOffsetType *) NULL)
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
for (scene=0; scene < 1024; scene++)
(void) WriteBlobLSBLong(image,0x00000000L);
}
scene=0;
imageListLength=GetImageListLength(image);
do
{
if (page_table != (MagickOffsetType *) NULL)
page_table[scene]=TellBlob(image);
/*
Initialize PCX raster file header.
*/
pcx_info.identifier=0x0a;
pcx_info.version=5;
pcx_info.encoding=image_info->compression == NoCompression ? 0 : 1;
pcx_info.bits_per_pixel=8;
if ((image->storage_class == PseudoClass) &&
(SetImageMonochrome(image,&image->exception) != MagickFalse))
pcx_info.bits_per_pixel=1;
pcx_info.left=0;
pcx_info.top=0;
pcx_info.right=(unsigned short) (image->columns-1);
pcx_info.bottom=(unsigned short) (image->rows-1);
switch (image->units)
{
case UndefinedResolution:
case PixelsPerInchResolution:
default:
{
pcx_info.horizontal_resolution=(unsigned short) image->x_resolution;
pcx_info.vertical_resolution=(unsigned short) image->y_resolution;
break;
}
case PixelsPerCentimeterResolution:
{
pcx_info.horizontal_resolution=(unsigned short)
(2.54*image->x_resolution+0.5);
pcx_info.vertical_resolution=(unsigned short)
(2.54*image->y_resolution+0.5);
break;
}
}
pcx_info.reserved=0;
pcx_info.planes=1;
if ((image->storage_class == DirectClass) || (image->colors > 256))
{
pcx_info.planes=3;
if (image->matte != MagickFalse)
pcx_info.planes++;
}
length=(((size_t) image->columns*pcx_info.bits_per_pixel+7)/8);
if ((image->columns > 65535UL) || (image->rows > 65535UL) ||
(length > 65535UL))
{
if (page_table != (MagickOffsetType *) NULL)
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
}
pcx_info.bytes_per_line=(unsigned short) length;
pcx_info.palette_info=1;
pcx_info.colormap_signature=0x0c;
/*
Write PCX header.
*/
(void) WriteBlobByte(image,pcx_info.identifier);
(void) WriteBlobByte(image,pcx_info.version);
(void) WriteBlobByte(image,pcx_info.encoding);
(void) WriteBlobByte(image,pcx_info.bits_per_pixel);
(void) WriteBlobLSBShort(image,pcx_info.left);
(void) WriteBlobLSBShort(image,pcx_info.top);
(void) WriteBlobLSBShort(image,pcx_info.right);
(void) WriteBlobLSBShort(image,pcx_info.bottom);
(void) WriteBlobLSBShort(image,pcx_info.horizontal_resolution);
(void) WriteBlobLSBShort(image,pcx_info.vertical_resolution);
/*
Dump colormap to file.
*/
pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
3*sizeof(*pcx_colormap));
if (pcx_colormap == (unsigned char *) NULL)
{
if (page_table != (MagickOffsetType *) NULL)
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
}
(void) memset(pcx_colormap,0,3*256*sizeof(*pcx_colormap));
q=pcx_colormap;
if ((image->storage_class == PseudoClass) && (image->colors <= 256))
for (i=0; i < (ssize_t) image->colors; i++)
{
*q++=ScaleQuantumToChar(image->colormap[i].red);
*q++=ScaleQuantumToChar(image->colormap[i].green);
*q++=ScaleQuantumToChar(image->colormap[i].blue);
}
(void) WriteBlob(image,3*16,(const unsigned char *) pcx_colormap);
(void) WriteBlobByte(image,pcx_info.reserved);
(void) WriteBlobByte(image,pcx_info.planes);
(void) WriteBlobLSBShort(image,pcx_info.bytes_per_line);
(void) WriteBlobLSBShort(image,pcx_info.palette_info);
for (i=0; i < 58; i++)
(void) WriteBlobByte(image,'\0');
length=(size_t) pcx_info.bytes_per_line;
pixel_info=AcquireVirtualMemory(length,pcx_info.planes*sizeof(*pixels));
if (pixel_info == (MemoryInfo *) NULL)
{
pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
if (page_table != (MagickOffsetType *) NULL)
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
}
pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
q=pixels;
if ((image->storage_class == DirectClass) || (image->colors > 256))
{
/*
Convert DirectClass image to PCX raster pixels.
*/
for (y=0; y < (ssize_t) image->rows; y++)
{
q=pixels;
for (i=0; i < pcx_info.planes; i++)
{
p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
switch ((int) i)
{
case 0:
{
for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
{
*q++=ScaleQuantumToChar(GetPixelRed(p));
p++;
}
break;
}
case 1:
{
for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
{
*q++=ScaleQuantumToChar(GetPixelGreen(p));
p++;
}
break;
}
case 2:
{
for (x=0; x < (ssize_t) pcx_info.bytes_per_line; x++)
{
*q++=ScaleQuantumToChar(GetPixelBlue(p));
p++;
}
break;
}
case 3:
default:
{
for (x=(ssize_t) pcx_info.bytes_per_line; x != 0; x--)
{
*q++=ScaleQuantumToChar((Quantum)
(GetPixelAlpha(p)));
p++;
}
break;
}
}
}
if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
break;
if (image->previous == (Image *) NULL)
{
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
}
}
else
{
if (pcx_info.bits_per_pixel > 1)
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
indexes=GetVirtualIndexQueue(image);
q=pixels;
for (x=0; x < (ssize_t) image->columns; x++)
*q++=(unsigned char) ((size_t) GetPixelIndex(indexes+x));
if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
break;
if (image->previous == (Image *) NULL)
{
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
y,image->rows);
if (status == MagickFalse)
break;
}
}
else
{
unsigned char
bit,
byte;
/*
Convert PseudoClass image to a PCX monochrome image.
*/
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
indexes=GetVirtualIndexQueue(image);
bit=0;
byte=0;
q=pixels;
for (x=0; x < (ssize_t) image->columns; x++)
{
byte<<=1;
if (GetPixelLuma(image,p) < (QuantumRange/2.0))
byte|=0x01;
bit++;
if (bit == 8)
{
*q++=byte;
bit=0;
byte=0;
}
p++;
}
if (bit != 0)
*q++=byte << (8-bit);
if (PCXWritePixels(&pcx_info,pixels,image) == MagickFalse)
break;
if (image->previous == (Image *) NULL)
{
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType)
y,image->rows);
if (status == MagickFalse)
break;
}
}
}
(void) WriteBlobByte(image,pcx_info.colormap_signature);
(void) WriteBlob(image,3*256,pcx_colormap);
}
pixel_info=RelinquishVirtualMemory(pixel_info);
pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
if (page_table == (MagickOffsetType *) NULL)
break;
if (scene >= 1023)
break;
if (GetNextImageInList(image) == (Image *) NULL)
break;
image=SyncNextImageInList(image);
status=SetImageProgress(image,SaveImagesTag,scene++,imageListLength);
if (status == MagickFalse)
break;
} while (image_info->adjoin != MagickFalse);
if (page_table != (MagickOffsetType *) NULL)
{
/*
Write the DCX page table.
*/
page_table[scene+1]=0;
offset=SeekBlob(image,0L,SEEK_SET);
if (offset < 0)
{
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
ThrowWriterException(CorruptImageError,"ImproperImageHeader");
}
(void) WriteBlobLSBLong(image,0x3ADE68B1L);
for (i=0; i <= (ssize_t) scene; i++)
(void) WriteBlobLSBLong(image,(unsigned int) page_table[i]);
page_table=(MagickOffsetType *) RelinquishMagickMemory(page_table);
}
if (status == MagickFalse)
{
char
*message;
message=GetExceptionMessage(errno);
(void) ThrowMagickException(&image->exception,GetMagickModule(),
FileOpenError,"UnableToWriteFile","`%s': %s",image->filename,message);
message=DestroyString(message);
}
(void) CloseBlob(image);
return(MagickTrue);
}