Legacy ImageMagick Discussions Archive

Code: Select all

    int find_black_pixel(MagickWand *wand) {
        int res = 0;
        PixelIterator * iterator = NewPixelIterator(wand);
        size_t width=MagickGetImageWidth(wand);
        size_t height=MagickGetImageHeight(wand);
        PixelWand ** pixels;
        unsigned long x,y;
        unsigned int alpha;
        unsigned int red, green, blue;
    
        //printf("Width : %d, Height : %d\n", (int)width, (int)height);
    
        for (y=0; y<height; y++) {
            pixels = PixelGetNextIteratorRow(iterator, &width);
            for (x=0; x<width; x++) {
    
                alpha = (unsigned int) (255*PixelGetAlpha(pixels[x]));
                if (alpha == 0)
                    continue;
    
                red = (unsigned int) (255*PixelGetRed(pixels[x]));
                green = (unsigned int) (255*PixelGetGreen(pixels[x]));
                blue = (unsigned int) (255*PixelGetBlue(pixels[x]));
    
                //printf("At %04ld,%04ld, alpha : %d, rgb : %d,%d,%d\n", x,y,alpha, red, green, blue);
    
                if ((red ==0) || (green == 0) || (blue ==0)) {
    
                    res = 1;
                    //DestroyPixelWands(pixels, width);
                    goto finished_find_black_pixel;
                }
    
            }
            //DestroyPixelWands(pixels, (size_t)width);
        }
    
    finished_find_black_pixel:
        DestroyPixelIterator(iterator);
    
        return res;
    }