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<li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
<li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
<li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
- <li><a href="../www/api/pixel-view.html">Pixel View Methods</a></li>
<li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
<li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
+ <li><a href="../www/api/mogrify.html">Command-line Interface</a></li>
+ <li><a href="../www/api/wand-view.html">Wand View Methods</a></li>
<li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
<li><a href="../www/exception.html">Error and Warning Codes</a></li>
</li>
<p>After you write your MagickWand program, compile it like this:</p>
-<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>cc `MagickWand-config --cflags --cppflags` -o wand wand.c \ <br/> `MagickWand-config --ldflags --libs`</span></p>
+<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>cc `MagickWand-config --cflags --cppflags` -O2 -o wand wand.c \ <br/> `MagickWand-config --ldflags --libs`</span></p>
<p>Here is a example program that utilizes the MagickWand API to get you started, <a href="../www/source/wand.c">wand.c</a>. It reads an image, creates a thumbnail, and writes the result to disk.</p>
<div class="viewport">
severity; \
\
description=MagickGetException(wand,&severity); \
- (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
+ (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
description=(char *) MagickRelinquishMemory(description); \
exit(-1); \
}
}
</pre>
</div>
-<p>Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing pixel views. The <a href="../www/source/sigmoidal-contrast.c">sigmoidal-contrast.c</a> module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).</p>
+<p><a name="wand-view"></a>Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing wand views. The <a href="../www/source/wand/sigmoidal-contrast.c">sigmoidal-contrast.c</a> module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).</p>
<div class="viewport">
<pre class="code">
#include <math.h>
#include <wand/MagickWand.h>
-static MagickBooleanType SigmoidalContrast(PixelView *pixel_view,
- void *context)
+static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
+ const ssize_t y,const int id,void *context)
{
#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
#define SigmoidalContrast(x) \
(QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
+ RectangleInfo
+ extent;
+
MagickPixelPacket
pixel;
register long
x;
- pixels=GetPixelViewPixels(contrast_view);
- for (x=0; x < (long) GetPixelViewWidth(contrast_view); x++)
+ extent=GetWandViewExtent(contrast_view);
+ pixels=GetWandViewPixels(contrast_view);
+ for (x=0; x < (long) (extent.width-extent.height); x++)
{
PixelGetMagickColor(pixels[x],&pixel);
pixel.red=SigmoidalContrast(pixel.red);
int main(int argc,char **argv)
{
+#define ThrowViewException(view) \
+{ \
+ description=GetWandViewException(view,&severity); \
+ (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
+ description=(char *) MagickRelinquishMemory(description); \
+ exit(-1); \
+}
#define ThrowWandException(wand) \
{ \
- char \
- *description; \
- \
- ExceptionType \
- severity; \
- \
- description=MagickGetException(wand,&severity); \
+ description=MagickGetException(wand,&severity); \
(void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
description=(char *) MagickRelinquishMemory(description); \
exit(-1); \
}
+ char
+ *description;
+
+ ExceptionType
+ severity;
+
MagickBooleanType
status;
MagickWand
*contrast_wand;
- PixelView
+ WandView
*contrast_view;
if (argc != 3)
/*
Sigmoidal non-linearity contrast control.
*/
- contrast_view=NewPixelView(contrast_wand);
- if (contrast_view == (PixelView *) NULL)
+ contrast_view=NewWandView(contrast_wand);
+ if (contrast_view == (WandView *) NULL)
ThrowWandException(contrast_wand);
- status=UpdatePixelViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
+ status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
if (status == MagickFalse)
ThrowWandException(contrast_wand);
- contrast_view=DestroyPixelView(contrast_view);
+ contrast_view=DestroyWandView(contrast_view);
/*
Write the image then destroy it.
*/
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