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DEFINITIONS
This source file includes following definitions.
- ReadRLAImage
- RegisterRLAImage
- UnregisterRLAImage
/*
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% %
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% RRRR L AAA %
% R R L A A %
% RRRR L AAAAA %
% R R L A A %
% R R LLLLL A A %
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% Read Alias/Wavefront Image Format %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% Copyright 1999-2013 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 %
% %
% http://www.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/property.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/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"
/*
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% R e a d R L A I m a g e %
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% ReadRLAImage() reads a run-length encoded Wavefront RLA image file
% and returns it. It allocates the memory necessary for the new Image
% structure and returns a pointer to the new image.
%
% Note: This module was contributed by Lester Vecsey (master@internexus.net).
%
% The format of the ReadRLAImage method is:
%
% Image *ReadRLAImage(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 *ReadRLAImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
typedef struct _WindowFrame
{
short
left,
right,
bottom,
top;
} WindowFrame;
typedef struct _RLAInfo
{
WindowFrame
window,
active_window;
short
frame,
storage_type,
number_channels,
number_matte_channels,
number_auxiliary_channels,
revision;
char
gamma[16],
red_primary[24],
green_primary[24],
blue_primary[24],
white_point[24];
ssize_t
job_number;
char
name[128],
description[128],
program[64],
machine[32],
user[32],
date[20],
aspect[24],
aspect_ratio[8],
chan[32];
short
field;
char
time[12],
filter[32];
short
bits_per_channel,
matte_type,
matte_bits,
auxiliary_type,
auxiliary_bits;
char
auxiliary[32],
space[36];
ssize_t
next;
} RLAInfo;
Image
*image;
int
channel,
length,
runlength;
MagickBooleanType
status;
MagickOffsetType
offset;
register ssize_t
i,
x;
register PixelPacket
*q;
ssize_t
count,
*scanlines,
y;
RLAInfo
rla_info;
unsigned char
byte;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AcquireImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
rla_info.window.left=(short) ReadBlobMSBShort(image);
rla_info.window.right=(short) ReadBlobMSBShort(image);
rla_info.window.bottom=(short) ReadBlobMSBShort(image);
rla_info.window.top=(short) ReadBlobMSBShort(image);
rla_info.active_window.left=(short) ReadBlobMSBShort(image);
rla_info.active_window.right=(short) ReadBlobMSBShort(image);
rla_info.active_window.bottom=(short) ReadBlobMSBShort(image);
rla_info.active_window.top=(short) ReadBlobMSBShort(image);
rla_info.frame=(short) ReadBlobMSBShort(image);
rla_info.storage_type=(short) ReadBlobMSBShort(image);
rla_info.number_channels=(short) ReadBlobMSBShort(image);
rla_info.number_matte_channels=(short) ReadBlobMSBShort(image);
if (rla_info.number_channels == 0)
rla_info.number_channels=3;
rla_info.number_channels+=rla_info.number_matte_channels;
rla_info.number_auxiliary_channels=(short) ReadBlobMSBShort(image);
rla_info.revision=(short) ReadBlobMSBShort(image);
count=ReadBlob(image,16,(unsigned char *) rla_info.gamma);
count=ReadBlob(image,24,(unsigned char *) rla_info.red_primary);
count=ReadBlob(image,24,(unsigned char *) rla_info.green_primary);
count=ReadBlob(image,24,(unsigned char *) rla_info.blue_primary);
count=ReadBlob(image,24,(unsigned char *) rla_info.white_point);
rla_info.job_number=(int) ReadBlobMSBLong(image);
count=ReadBlob(image,128,(unsigned char *) rla_info.name);
count=ReadBlob(image,128,(unsigned char *) rla_info.description);
count=ReadBlob(image,64,(unsigned char *) rla_info.program);
count=ReadBlob(image,32,(unsigned char *) rla_info.machine);
count=ReadBlob(image,32,(unsigned char *) rla_info.user);
count=ReadBlob(image,20,(unsigned char *) rla_info.date);
count=ReadBlob(image,24,(unsigned char *) rla_info.aspect);
count=ReadBlob(image,8,(unsigned char *) rla_info.aspect_ratio);
count=ReadBlob(image,32,(unsigned char *) rla_info.chan);
rla_info.field=(short) ReadBlobMSBShort(image);
count=ReadBlob(image,12,(unsigned char *) rla_info.time);
count=ReadBlob(image,32,(unsigned char *) rla_info.filter);
rla_info.bits_per_channel=(short) ReadBlobMSBShort(image);
rla_info.matte_type=(short) ReadBlobMSBShort(image);
rla_info.matte_bits=(short) ReadBlobMSBShort(image);
rla_info.auxiliary_type=(short) ReadBlobMSBShort(image);
rla_info.auxiliary_bits=(short) ReadBlobMSBShort(image);
count=ReadBlob(image,32,(unsigned char *) rla_info.auxiliary);
count=ReadBlob(image,36,(unsigned char *) rla_info.space);
if ((size_t) count != 36)
ThrowReaderException(CorruptImageError,"UnableToReadImageData");
rla_info.next=(int) ReadBlobMSBLong(image);
/*
Initialize image structure.
*/
image->matte=rla_info.number_matte_channels != 0 ? MagickTrue : MagickFalse;
image->columns=1UL*rla_info.active_window.right-rla_info.active_window.left+1;
image->rows=1UL*rla_info.active_window.top-rla_info.active_window.bottom+1;
if (image_info->ping != MagickFalse)
{
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
scanlines=(ssize_t *) AcquireQuantumMemory(image->rows,sizeof(*scanlines));
if (scanlines == (ssize_t *) NULL)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
if (*rla_info.description != '\0')
(void) SetImageProperty(image,"comment",rla_info.description);
/*
Read offsets to each scanline data.
*/
for (i=0; i < (ssize_t) image->rows; i++)
scanlines[i]=(int) ReadBlobMSBLong(image);
/*
Read image data.
*/
x=0;
for (y=0; y < (ssize_t) image->rows; y++)
{
offset=SeekBlob(image,scanlines[image->rows-y-1],SEEK_SET);
if (offset < 0)
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
for (channel=0; channel < (int) rla_info.number_channels; channel++)
{
length=(int) ReadBlobMSBShort(image);
while (length > 0)
{
byte=(unsigned char) ReadBlobByte(image);
runlength=byte;
if (byte > 127)
runlength=byte-256;
length--;
if (length == 0)
break;
if (runlength < 0)
{
while (runlength < 0)
{
q=GetAuthenticPixels(image,(ssize_t) (x % image->columns),
(ssize_t) (y % image->rows),1,1,exception);
if (q == (PixelPacket *) NULL)
break;
byte=(unsigned char) ReadBlobByte(image);
length--;
switch (channel)
{
case 0:
{
SetPixelRed(q,ScaleCharToQuantum(byte));
break;
}
case 1:
{
SetPixelGreen(q,ScaleCharToQuantum(byte));
break;
}
case 2:
{
SetPixelBlue(q,ScaleCharToQuantum(byte));
break;
}
case 3:
default:
{
SetPixelAlpha(q,ScaleCharToQuantum(byte));
break;
}
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
x++;
runlength++;
}
continue;
}
byte=(unsigned char) ReadBlobByte(image);
length--;
runlength++;
do
{
q=GetAuthenticPixels(image,(ssize_t) (x % image->columns),
(ssize_t) (y % image->rows),1,1,exception);
if (q == (PixelPacket *) NULL)
break;
switch (channel)
{
case 0:
{
SetPixelRed(q,ScaleCharToQuantum(byte));
break;
}
case 1:
{
SetPixelGreen(q,ScaleCharToQuantum(byte));
break;
}
case 2:
{
SetPixelBlue(q,ScaleCharToQuantum(byte));
break;
}
case 3:
default:
{
SetPixelAlpha(q,ScaleCharToQuantum(byte));
break;
}
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
x++;
runlength--;
}
while (runlength > 0);
}
}
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));
}
/*
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% R e g i s t e r R L A I m a g e %
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% RegisterRLAImage() adds attributes for the RLA 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 RegisterRLAImage method is:
%
% size_t RegisterRLAImage(void)
%
*/
ModuleExport size_t RegisterRLAImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("RLA");
entry->decoder=(DecodeImageHandler *) ReadRLAImage;
entry->adjoin=MagickFalse;
entry->seekable_stream=MagickTrue;
entry->description=ConstantString("Alias/Wavefront image");
entry->module=ConstantString("RLA");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r R L A I m a g e %
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% UnregisterRLAImage() removes format registrations made by the
% RLA module from the list of supported formats.
%
% The format of the UnregisterRLAImage method is:
%
% UnregisterRLAImage(void)
%
*/
ModuleExport void UnregisterRLAImage(void)
{
(void) UnregisterMagickInfo("RLA");
}