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DEFINITIONS
This source file includes following definitions.
- RegisterMATTEImage
- UnregisterMATTEImage
- WriteMATTEImage
/*
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% M M A A T T E %
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% Write Matte Channel To MIFF File. %
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% Software Design %
% John Cristy %
% July 1992 %
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% Copyright 1999-2011 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. %
% %
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%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/constitute.h"
#include "magick/exception.h"
#include "magick/exception-private.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/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
/*
Forward declarations.
*/
static MagickBooleanType
WriteMATTEImage(const ImageInfo *,Image *);
/*
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% R e g i s t e r M A T T E I m a g e %
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% RegisterMATTEImage() adds attributes for the MATTE 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 RegisterMATTEImage method is:
%
% size_t RegisterMATTEImage(void)
%
*/
ModuleExport size_t RegisterMATTEImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("MATTE");
entry->encoder=(EncodeImageHandler *) WriteMATTEImage;
entry->format_type=ExplicitFormatType;
entry->description=ConstantString("MATTE format");
entry->module=ConstantString("MATTE");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r M A T T E I m a g e %
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% UnregisterMATTEImage() removes format registrations made by the
% MATTE module from the list of supported formats.
%
% The format of the UnregisterMATTEImage method is:
%
% UnregisterMATTEImage(void)
%
*/
ModuleExport void UnregisterMATTEImage(void)
{
(void) UnregisterMagickInfo("MATTE");
}
/*
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% W r i t e M A T T E I m a g e %
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% Function WriteMATTEImage() writes an image of matte bytes to a file. It
% consists of data from the matte component of the image [0..255].
%
% The format of the WriteMATTEImage method is:
%
% MagickBooleanType WriteMATTEImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
%
*/
static MagickBooleanType WriteMATTEImage(const ImageInfo *image_info,
Image *image)
{
ExceptionInfo
*exception;
Image
*matte_image;
ssize_t
y;
MagickBooleanType
status;
register const PixelPacket
*p;
register ssize_t
x;
register PixelPacket
*q;
if (image->matte == MagickFalse)
ThrowWriterException(CoderError,"ImageDoesNotHaveAAlphaChannel");
matte_image=CloneImage(image,image->columns,image->rows,MagickTrue,
&image->exception);
if (matte_image == (Image *) NULL)
return(MagickFalse);
(void) SetImageType(matte_image,TrueColorMatteType);
matte_image->matte=MagickFalse;
/*
Convert image to matte pixels.
*/
exception=(&image->exception);
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(image,0,y,image->columns,1,exception);
q=QueueAuthenticPixels(matte_image,0,y,matte_image->columns,1,exception);
if ((p == (const PixelPacket *) NULL) || (q == (PixelPacket *) NULL))
break;
for (x=0; x < (ssize_t) image->columns; x++)
{
q->red=GetOpacityPixelComponent(p);
q->green=GetOpacityPixelComponent(p);
q->blue=GetOpacityPixelComponent(p);
SetOpacityPixelComponent(q,OpaqueOpacity);
p++;
q++;
}
if (SyncAuthenticPixels(matte_image,exception) == MagickFalse)
break;
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
(void) FormatMagickString(matte_image->filename,MaxTextExtent,
"MIFF:%s",image->filename);
status=WriteImage(image_info,matte_image);
matte_image=DestroyImage(matte_image);
return(status);
}