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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% H H IIIII SSSSS TTTTT OOO GGGG RRRR AAA M M %
% H H I SS T O O G R R A A MM MM %
% HHHHH I SSS T O O G GG RRRR AAAAA M M M %
% H H I SS T O O G G R R A A M M %
% H H IIIII SSSSS T OOO GGG R R A A M M %
% %
% %
% Write A Histogram Image. %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% Copyright 1999-2004 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/www/Copyright.html %
% %
% 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/color.h"
#include "magick/color_private.h"
#include "magick/constitute.h"
#include "magick/error.h"
#include "magick/geometry.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/resource_.h"
#include "magick/static.h"
#include "magick/string_.h"
/*
Forward declarations.
*/
static MagickBooleanType
WriteHISTOGRAMImage(const ImageInfo *,Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r H I S T O G R A M I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterHISTOGRAMImage() adds attributes for the Histogram 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 RegisterHISTOGRAMImage method is:
%
% RegisterHISTOGRAMImage(void)
%
*/
ModuleExport void RegisterHISTOGRAMImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("HISTOGRAM");
entry->encoder=(EncoderHandler *) WriteHISTOGRAMImage;
entry->adjoin=MagickFalse;
entry->description=AcquireString("Histogram of the image");
entry->module=AcquireString("HISTOGRAM");
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r H I S T O G R A M I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterHISTOGRAMImage() removes format registrations made by the
% HISTOGRAM module from the list of supported formats.
%
% The format of the UnregisterHISTOGRAMImage method is:
%
% UnregisterHISTOGRAMImage(void)
%
*/
ModuleExport void UnregisterHISTOGRAMImage(void)
{
(void) UnregisterMagickInfo("HISTOGRAM");
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e H I S T O G R A M I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% WriteHISTOGRAMImage() writes an image to a file in Histogram format.
% The image shows a histogram of the color (or gray) values in the image. The
% image consists of three overlaid histograms: a red one for the red channel,
% a green one for the green channel, and a blue one for the blue channel. The
% image comment contains a list of unique pixel values and the number of times
% each occurs in the image.
%
% This method is strongly based on a similar one written by
% muquit@warm.semcor.com which in turn is based on ppmhistmap of netpbm.
%
% The format of the WriteHISTOGRAMImage method is:
%
% MagickBooleanType WriteHISTOGRAMImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: The image info.
%
% o image: The image.
%
%
*/
static MagickBooleanType WriteHISTOGRAMImage(const ImageInfo *image_info,
Image *image)
{
#define HistogramDensity "256x200"
char
filename[MaxTextExtent];
FILE
*file;
Image
*histogram_image;
int
unique_file;
long
y;
MagickBooleanType
status;
MagickPixelPacket
*histogram;
MagickRealType
maximum,
scale;
RectangleInfo
geometry;
register const PixelPacket
*p;
register long
x;
register PixelPacket
*q,
*r;
size_t
length;
/*
Allocate histogram image.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image_info->filename);
(void) SetImageDepth(image,image->depth);
SetGeometry(image,&geometry);
if (image_info->density == (char *) NULL)
(void) ParseAbsoluteGeometry(HistogramDensity,&geometry);
else
(void) ParseAbsoluteGeometry(image_info->density,&geometry);
histogram_image=CloneImage(image,geometry.width,geometry.height,MagickTrue,
&image->exception);
if (histogram_image == (Image *) NULL)
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
histogram_image->storage_class=DirectClass;
/*
Allocate histogram count arrays.
*/
length=(size_t) Max((unsigned long) ScaleQuantumToChar(MaxRGB)+1,
histogram_image->columns);
histogram=(MagickPixelPacket *)
AcquireMagickMemory(length*sizeof(*histogram));
if (histogram == (MagickPixelPacket *) NULL)
{
DestroyImage(histogram_image);
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
}
/*
Initialize histogram count arrays.
*/
(void) ResetMagickMemory(histogram,0,length*sizeof(*histogram));
for (y=0; y < (long) image->rows; y++)
{
p=AcquireImagePixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
histogram[ScaleQuantumToChar(p->red)].red++;
histogram[ScaleQuantumToChar(p->green)].green++;
histogram[ScaleQuantumToChar(p->blue)].blue++;
p++;
}
}
maximum=histogram[0].red;
for (x=0; x < (long) histogram_image->columns; x++)
{
if (maximum < histogram[x].red)
maximum=histogram[x].red;
if (maximum < histogram[x].green)
maximum=histogram[x].green;
if (maximum < histogram[x].blue)
maximum=histogram[x].blue;
}
scale=(MagickRealType) histogram_image->rows/maximum;
/*
Initialize histogram image.
*/
(void) QueryColorDatabase("#000000",&histogram_image->background_color,
&image->exception);
SetImage(histogram_image,OpaqueOpacity);
for (x=0; x < (long) histogram_image->columns; x++)
{
q=GetImagePixels(histogram_image,x,0,1,histogram_image->rows);
if (q == (PixelPacket *) NULL)
break;
y=(long) (histogram_image->rows-scale*histogram[x].red+0.5);
r=q+y;
for ( ; y < (long) histogram_image->rows; y++)
{
r->red=MaxRGB;
r++;
}
y=(long) (histogram_image->rows-scale*histogram[x].green+0.5);
r=q+y;
for ( ; y < (long) histogram_image->rows; y++)
{
r->green=MaxRGB;
r++;
}
y=(long) (histogram_image->rows-scale*histogram[x].blue+0.5);
r=q+y;
for ( ; y < (long) histogram_image->rows; y++)
{
r->blue=MaxRGB;
r++;
}
if (SyncImagePixels(histogram_image) == MagickFalse)
break;
if (QuantumTick(x,(long) histogram_image->columns))
{
status=MagickMonitor(SaveImageTag,x,histogram_image->columns,
&image->exception);
if (status == MagickFalse)
break;
}
}
/*
Free resources.
*/
histogram=(MagickPixelPacket *) RelinquishMagickMemory(histogram);
file=(FILE *) NULL;
unique_file=AcquireUniqueFileResource(filename);
if (unique_file != -1)
file=fdopen(unique_file,"wb");
if ((unique_file != -1) && (file != (FILE *) NULL))
{
char
command[MaxTextExtent];
/*
Add a histogram as an image comment.
*/
(void) GetNumberColors(image,file,&image->exception);
(void) fclose(file);
(void) FormatMagickString(command,MaxTextExtent,"@%s",filename);
(void) SetImageAttribute(histogram_image,"comment",command);
}
(void) RelinquishUniqueFileResource(filename);
/*
Write Histogram image as MIFF.
*/
(void) CopyMagickString(filename,histogram_image->filename,MaxTextExtent);
(void) FormatMagickString(histogram_image->filename,MaxTextExtent,
"miff:%s",filename);
status=WriteImage(image_info,histogram_image);
DestroyImage(histogram_image);
return(status);
}
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