Re: [magick-developers] Scaling an image and processing the scaled image (Magick++)

[John Wood]

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;
}
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