Re: Scaling an image and processing the scaled image (Magick++)

2006/12/7, [email protected] <[email protected]>:
> > Ok, no problem, attached is a small sample program which illustrates my problem.
>
> Send the program directly to us.  The mailling list does not permit attachments.
>

Thanks for the speedy replys.

Here is some code, I run Ubuntu 6.10 and compile with g++ `sdl-config
--cflags --libs` `Magick++-config --cppflags --cxxflags --ldflags
--libs` magicksample.cpp -o magicksample

Contents of magicksample.cpp

#include <iostream>

#include "Magick++.h"
#include "SDL.h"

using namespace std;
using namespace Magick;

void display(Image &image)
{		
	unsigned int width, height;
	
	// Get width and height of image.	
	width = image.columns();
	height = image.rows();
	
	// Initialize SDL.
	SDL_Init(SDL_INIT_VIDEO);	

	// Create SDL_Surface to draw image onto.
	SDL_Surface *surface;
	
	surface = SDL_SetVideoMode(width, height, 32, SDL_HWSURFACE);	

	// Get pointer to pixels of image.
	const PixelPacket *imagepixels = image.getConstPixels(0, 0, width, height);
	
	// Get pointer to pixels of surface.
	Uint32 *surfacepixels = (Uint32 *)surface->pixels;
	
	// Copy image pixels to surface.
	Uint32 color;

    	SDL_LockSurface(surface);

	for (int row = 0; row < surface->h; row++) {
		for(int column = 0; column < surface->w; column++) {    		
			color = SDL_MapRGB(surface->format,
							   imagepixels->red,
							   imagepixels->green,
							   imagepixels->blue);
    		
			*surfacepixels = color;
    		
			// Increment pointers.
			surfacepixels++;
			imagepixels++;
		}
	}

	SDL_UnlockSurface(surface);

	// Update surface.
	SDL_UpdateRect(surface, 0, 0, surface->w, surface->h);

	SDL_Delay(5000);
    	
	return;
}

int main(int argc, char **argv)
{	
	// Initialize ImageMagick install location for Windows
  	InitializeMagick(*argv);

	Image image;

	try {
		// Read file into image object.
		image.read( "logo:" );

		// Display image for 5 seconds.
		display(image);
		
		// Set image modifiable.
		image.modifyImage();
		
		// Scale image to smaller size.
		image.scale( "50x50%" );

		// Display scaled image for 5 seconds.
		display(image);
	}
	catch( Exception &error_ )
	{
		cout << "Caught exception: " << error_.what() << endl;
		return 1;
	}
	
	return 0;
}