/*
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% G R R A A D D I E NN N T %
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% Read/Write ImageMagick Image Format. %
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% Software Design %
% John Cristy %
% July 1992 %
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% Copyright (C) 2001 ImageMagick Studio, a non-profit organization dedicated %
% to making software imaging solutions freely available. %
% %
% Permission is hereby granted, free of charge, to any person obtaining a %
% copy of this software and associated documentation files ("ImageMagick"), %
% to deal in ImageMagick without restriction, including without limitation %
% the rights to use, copy, modify, merge, publish, distribute, sublicense, %
% and/or sell copies of ImageMagick, and to permit persons to whom the %
% ImageMagick is furnished to do so, subject to the following conditions: %
% %
% The above copyright notice and this permission notice shall be included in %
% all copies or substantial portions of ImageMagick. %
% %
% The software is provided "as is", without warranty of any kind, express or %
% implied, including but not limited to the warranties of merchantability, %
% fitness for a particular purpose and noninfringement. In no event shall %
% ImageMagick Studio be liable for any claim, damages or other liability, %
% whether in an action of contract, tort or otherwise, arising from, out of %
% or in connection with ImageMagick or the use or other dealings in %
% ImageMagick. %
% %
% Except as contained in this notice, the name of the ImageMagick Studio %
% shall not be used in advertising or otherwise to promote the sale, use or %
% other dealings in ImageMagick without prior written authorization from the %
% ImageMagick Studio. %
% %
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*/
/*
Include declarations.
*/
#include "magick.h"
#include "defines.h"
/*
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% R e a d G R A D I E N T I m a g e %
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% Method ReadGRADIENTImage creates a gradient image and initializes it to
% the X server color range as specified by the filename. It allocates the
% memory necessary for the new Image structure and returns a pointer to the
% new image.
%
% The format of the ReadGRADIENTImage method is:
%
% Image *ReadGRADIENTImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadGRADIENTImage returns a pointer to the image after
% creating it. A null image is returned if there is a memory shortage
% or if the image cannot be read.
%
% o image_info: Specifies a pointer to an ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadGRADIENTImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
colorname[MaxTextExtent];
PixelPacket
color;
double
brightness,
brightness_step,
hue,
hue_step,
saturation,
saturation_step;
Image
*image;
int
y;
register int
x;
register PixelPacket
*q;
/*
Initialize Image structure.
*/
image=AllocateImage(image_info);
(void) strcpy(image->filename,image_info->filename);
if (image->columns == 0)
image->columns=512;
if (image->rows == 0)
image->rows=512;
/*
Determine (Hue, Saturation, Brightness) gradient.
*/
(void) strcpy(colorname,image_info->filename);
(void) sscanf(image_info->filename,"%[^-]",colorname);
(void) QueryColorDatabase(colorname,&color);
TransformHSL(color.red,color.green,color.blue,&hue,&saturation,&brightness);
(void) strcpy(colorname,"white");
if (Intensity(color) > (0.5*MaxRGB))
(void) strcpy(colorname,"black");
(void) sscanf(image_info->filename,"%*[^-]-%s",colorname);
(void) QueryColorDatabase(colorname,&color);
TransformHSL(color.red,color.green,color.blue,&hue_step,&saturation_step,
&brightness_step);
hue_step=(hue_step-hue)/(double) (image->columns*image->rows);
saturation_step=
(saturation_step-saturation)/(double) (image->columns*image->rows);
brightness_step=
(brightness_step-brightness)/(double) (image->columns*image->rows);
/*
Initialize image pixels.
*/
for (y=0; y < (int) image->rows; y++)
{
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (int) image->columns; x++)
{
HSLTransform(hue,saturation,brightness,&q->red,&q->green,&q->blue);
q++;
hue+=hue_step;
saturation+=saturation_step;
brightness+=brightness_step;
}
if (!SyncImagePixels(image))
break;
if (QuantumTick(y,image->rows))
MagickMonitor(LoadImageText,y,image->rows);
}
return(image);
}
/*
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% R e g i s t e r G R A D I E N T I m a g e %
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% Method RegisterGRADIENTImage adds attributes for the GRADIENT 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 RegisterGRADIENTImage method is:
%
% RegisterGRADIENTImage(void)
%
*/
ModuleExport void RegisterGRADIENTImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("GRADIENT");
entry->decoder=ReadGRADIENTImage;
entry->adjoin=False;
entry->description=
AllocateString("Gradual passing from one shade to another");
entry->module=AllocateString("GRADIENT");
RegisterMagickInfo(entry);
}
/*
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% U n r e g i s t e r G R A D I E N T I m a g e %
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% Method UnregisterGRADIENTImage removes format registrations made by the
% GRADIENT module from the list of supported formats.
%
% The format of the UnregisterGRADIENTImage method is:
%
% UnregisterGRADIENTImage(void)
%
*/
ModuleExport void UnregisterGRADIENTImage(void)
{
UnregisterMagickInfo("GRADIENT");
}
