/* $Id: fb_gdkpixbuf.c,v 1.5 2002/07/18 15:12:06 ukai Exp $ */
/**************************************************************************
                fb_gdkpixbuf.c 0.2 Copyright (C) 2002, hito
 **************************************************************************/

#include "fb.h"
#include "fb_img.h"

static void set_prm(IMAGE * img);

IMAGE *
fb_load_image(char *filename, int w, int h)
{
    GdkPixbuf *pixbuf;
    IMAGE *img;

    if (filename == NULL)
	return NULL;

    img = malloc(sizeof(*img));
    if (img == NULL)
	return NULL;

    pixbuf = gdk_pixbuf_new_from_file(filename);
    if (pixbuf == NULL) {
	free(img);
	return NULL;
    }

    img->pixbuf = pixbuf;
    set_prm(img);

    fb_resize_image(img, w, h);

    return img;
}

int
fb_draw_image(IMAGE * img, int x, int y, int sx, int sy, int width, int height)
{
    int i, j, r, g, b, offset, bpp;

    if (img == NULL)
	return 1;

    bpp = img->rowstride / img->width;
    for (j = sy; j < sy + height && j < img->height; j++) {
	offset = j * img->rowstride + bpp * sx;
	for (i = sx; i < sx + width && i < img->width; i++, offset += bpp) {
	    r = img->pixels[offset];
	    g = img->pixels[offset + 1];
	    b = img->pixels[offset + 2];
	    if (img->alpha && img->pixels[offset + 3] == 0)
		fb_pset(i + x - sx, j + y - sy, bg_r, bg_g, bg_b);
	    else
		fb_pset(i + x - sx, j + y - sy, r, g, b);
	}
    }
    return 0;
}

int
fb_resize_image(IMAGE * img, int width, int height)
{
    GdkPixbuf *pixbuf;
    if (width < 1 || height < 1 || img == NULL)
	return 1;

    if (width == img->width && height == img->height)
	return 0;

    pixbuf =
	gdk_pixbuf_scale_simple(img->pixbuf, width, height, GDK_INTERP_HYPER);
    if (pixbuf == NULL)
	return 1;
    gdk_pixbuf_finalize(img->pixbuf);

    img->pixbuf = pixbuf;
    set_prm(img);
    return 0;
}

void
fb_free_image(IMAGE * img)
{
    if (img == NULL)
	return;

    gdk_pixbuf_finalize(img->pixbuf);
    free(img);
}

IMAGE *
fb_dup_image(IMAGE * img)
{
    GdkPixbuf *pixbuf;
    IMAGE *new_img;

    if (img == NULL)
	return NULL;

    new_img = malloc(sizeof(*img));
    if (new_img == NULL)
	return NULL;

    pixbuf = gdk_pixbuf_copy(img->pixbuf);
    if (pixbuf == NULL) {
	free(new_img);
	return NULL;
    }

    new_img->pixbuf = pixbuf;
    set_prm(new_img);
    return new_img;
}

int
fb_rotate_image(IMAGE * img, int angle)
{
    return 1;
}

static void
set_prm(IMAGE * img)
{
    GdkPixbuf *pixbuf;

    if (img == NULL)
	return;
    pixbuf = img->pixbuf;

    img->pixels = gdk_pixbuf_get_pixels(pixbuf);
    img->width = gdk_pixbuf_get_width(pixbuf);
    img->height = gdk_pixbuf_get_height(pixbuf);
    img->alpha = gdk_pixbuf_get_has_alpha(pixbuf);
    img->rowstride = gdk_pixbuf_get_rowstride(pixbuf);
}