This source file includes following definitions.
- RegisterHISTOGRAMImage
- UnregisterHISTOGRAMImage
- WriteHISTOGRAMImage
#include "magick/studio.h"
#include "magick/artifact.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/constitute.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/geometry.h"
#include "magick/histogram.h"
#include "magick/image-private.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/option.h"
#include "magick/pixel-accessor.h"
#include "magick/property.h"
#include "magick/quantum-private.h"
#include "magick/resource_.h"
#include "magick/static.h"
#include "magick/statistic.h"
#include "magick/string_.h"
#include "magick/module.h"
#include "magick/token.h"
#include "magick/utility.h"
static MagickBooleanType
WriteHISTOGRAMImage(const ImageInfo *,Image *);
ModuleExport size_t RegisterHISTOGRAMImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("HISTOGRAM");
entry->encoder=(EncodeImageHandler *) WriteHISTOGRAMImage;
entry->adjoin=MagickFalse;
entry->format_type=ImplicitFormatType;
entry->description=ConstantString("Histogram of the image");
entry->module=ConstantString("HISTOGRAM");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
ModuleExport void UnregisterHISTOGRAMImage(void)
{
(void) UnregisterMagickInfo("HISTOGRAM");
}
static MagickBooleanType WriteHISTOGRAMImage(const ImageInfo *image_info,
Image *image)
{
#define HistogramDensity "256x200"
ChannelType
channel;
char
filename[MaxTextExtent];
const char
*option;
ExceptionInfo
*exception;
Image
*histogram_image;
ImageInfo
*write_info;
MagickBooleanType
status;
MagickPixelPacket
*histogram;
MagickRealType
maximum,
scale;
RectangleInfo
geometry;
register const PixelPacket
*p;
register PixelPacket
*q,
*r;
register ssize_t
x;
size_t
length;
ssize_t
y;
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(),"%s",
image_info->filename);
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");
(void) SetImageStorageClass(histogram_image,DirectClass);
length=MagickMax((size_t) ScaleQuantumToChar(QuantumRange)+1UL,
histogram_image->columns);
histogram=(MagickPixelPacket *) AcquireQuantumMemory(length,
sizeof(*histogram));
if (histogram == (MagickPixelPacket *) NULL)
{
histogram_image=DestroyImage(histogram_image);
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
}
channel=image_info->channel;
(void) ResetMagickMemory(histogram,0,length*sizeof(*histogram));
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;
for (x=0; x < (ssize_t) image->columns; x++)
{
if ((channel & RedChannel) != 0)
histogram[ScaleQuantumToChar(GetPixelRed(p))].red++;
if ((channel & GreenChannel) != 0)
histogram[ScaleQuantumToChar(GetPixelGreen(p))].green++;
if ((channel & BlueChannel) != 0)
histogram[ScaleQuantumToChar(GetPixelBlue(p))].blue++;
p++;
}
}
maximum=histogram[0].red;
for (x=0; x < (ssize_t) histogram_image->columns; x++)
{
if (((channel & RedChannel) != 0) && (maximum < histogram[x].red))
maximum=histogram[x].red;
if (((channel & GreenChannel) != 0) && (maximum < histogram[x].green))
maximum=histogram[x].green;
if (((channel & BlueChannel) != 0) && (maximum < histogram[x].blue))
maximum=histogram[x].blue;
}
scale=0.0;
if (fabs(maximum) >= MagickEpsilon)
scale=(MagickRealType) histogram_image->rows/maximum;
exception=(&image->exception);
(void) QueryColorDatabase("#000",&histogram_image->background_color,
&image->exception);
(void) SetImageBackgroundColor(histogram_image);
for (x=0; x < (ssize_t) histogram_image->columns; x++)
{
q=GetAuthenticPixels(histogram_image,x,0,1,histogram_image->rows,exception);
if (q == (PixelPacket *) NULL)
break;
if ((channel & RedChannel) != 0)
{
y=(ssize_t) ceil(histogram_image->rows-scale*histogram[x].red-0.5);
r=q+y;
for ( ; y < (ssize_t) histogram_image->rows; y++)
{
SetPixelRed(r,QuantumRange);
r++;
}
}
if ((channel & GreenChannel) != 0)
{
y=(ssize_t) ceil(histogram_image->rows-scale*histogram[x].green-0.5);
r=q+y;
for ( ; y < (ssize_t) histogram_image->rows; y++)
{
SetPixelGreen(r,QuantumRange);
r++;
}
}
if ((channel & BlueChannel) != 0)
{
y=(ssize_t) ceil(histogram_image->rows-scale*histogram[x].blue-0.5);
r=q+y;
for ( ; y < (ssize_t) histogram_image->rows; y++)
{
SetPixelBlue(r,QuantumRange);
r++;
}
}
if (SyncAuthenticPixels(histogram_image,exception) == MagickFalse)
break;
status=SetImageProgress(image,SaveImageTag,y,histogram_image->rows);
if (status == MagickFalse)
break;
}
histogram=(MagickPixelPacket *) RelinquishMagickMemory(histogram);
option=GetImageOption(image_info,"histogram:unique-colors");
if ((option == (const char *) NULL) || (IsMagickTrue(option) != MagickFalse))
{
FILE
*file;
int
unique_file;
file=(FILE *) NULL;
unique_file=AcquireUniqueFileResource(filename);
if (unique_file != -1)
file=fdopen(unique_file,"wb");
if ((unique_file != -1) && (file != (FILE *) NULL))
{
char
*property;
(void) GetNumberColors(image,file,&image->exception);
(void) fclose(file);
property=FileToString(filename,~0UL,&image->exception);
if (property != (char *) NULL)
{
(void) SetImageProperty(histogram_image,"comment",property);
property=DestroyString(property);
}
}
(void) RelinquishUniqueFileResource(filename);
}
(void) CopyMagickString(histogram_image->filename,image_info->filename,
MaxTextExtent);
write_info=CloneImageInfo(image_info);
*write_info->magick='\0';
(void) SetImageInfo(write_info,1,&image->exception);
if (LocaleCompare(write_info->magick,"HISTOGRAM") == 0)
(void) FormatLocaleString(histogram_image->filename,MaxTextExtent,
"miff:%s",write_info->filename);
status=WriteImage(write_info,histogram_image);
histogram_image=DestroyImage(histogram_image);
write_info=DestroyImageInfo(write_info);
return(status);
}