[SOLVED] PNG - scale

kalleanka · 10-22-2011, 05:41 AM

Hi,

i cant find an easy way to load a png as a background in a xwindow (ths is to make a simple icon). Its easy in gtk but i do not want a huge lib for it. I looked at libpng and cairo but i cant figure out how to do it. What i want to do is something like this:

a_type *my_image = load_png_from_file(image.png);

scale_image(my_image, sx, sy);

// could be ximage etc insteed of pixmap
pix = a_type_2_pixmap(my_image);

//combine mask if needed

xsetwindowbackgroundpixmap(disp, win, pix) ;

any tips or idees!!

kalleanka · 10-22-2011, 06:39 AM

I found this list http://libpng.org/pub/png/pngaptk.html with libs for PNG.

kalleanka · 10-24-2011, 02:27 PM

ok i found imlib2 and wrote a test program. Now i need to fix the shape-mask to be transparent (so only the icon is showed). In Xlib I use Xshapecombinemask(). How is it done with imlib2? Any idees?

test:

Code:

#include <X11/Xlib.h>
#include <Imlib2.h>
#include <stdio.h>

Display *disp;
Window   win;
Visual  *vis;
Colormap cm;
int      depth;

int main(int argc, char **argv)
{
    XEvent ev;
    Imlib_Image image;
    Pixmap pix, mask;
    int w, h;
    
    disp  = XOpenDisplay(NULL);
    vis   = DefaultVisual(disp, DefaultScreen(disp));
    depth = DefaultDepth(disp, DefaultScreen(disp));
    cm    = DefaultColormap(disp, DefaultScreen(disp));
   
    win = XCreateSimpleWindow(disp, DefaultRootWindow(disp), 0, 0, 600, 600, 0, 0, 0);
   
  // XSelectInput(disp, win, ButtonPressMask | ButtonReleaseMask | PointerMotionMask | ExposureMask);
   
    XMapWindow(disp, win);
    XSync(disp, False);

    imlib_context_set_dither(1);
    imlib_context_set_display(disp);
    imlib_context_set_visual(vis);

    image = imlib_load_image("./bg.png");
    imlib_context_set_image(image);

    pix = XCreatePixmap(disp, win, 600, 600, depth);
    imlib_context_set_drawable(pix);   
    imlib_render_image_on_drawable_at_size(50, 50, 500, 500);

    XSetWindowBackgroundPixmap(disp, win, pix);
    XClearWindow(disp, win);

    while (1)
    {
         XNextEvent(disp, &ev);
         switch (ev.type)
         {
               case ButtonPress:
                  break;
               default:
                  break;
         }
    }
    return (0);
}

kalleanka · 10-25-2011, 07:38 AM

so im just going to fill the background with a color(same as mother). Its good enought for me.

like this:
gc = XCreateGC(dpy, pix, 0, &xgcv);
XSetForeground(dpy, gc, my_color);
XFillRectangle(dpy, pix, gc, 0, 0, w, h);