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Sourcecode: zbar version File versions  Download package

int zbar_window_redraw ( zbar_window_t window  )  [inline]

redraw the last image (exposure handler).

Definition at line 142 of file window.c.

References ZBAR_ERR_UNSUPPORTED, zbar_image_convert_resize(), zbar_image_destroy(), zbar_symbol_set_ref(), and zbar_window_redraw().

Referenced by zbar::Window::redraw(), and zbar_window_redraw().

{
    if(window_lock(w))
        return(-1);
    if(!w->display || _zbar_window_begin(w)) {
        (void)window_unlock(w);
        return(-1);
    }

    int rc = 0;
    zbar_image_t *img = w->image;
    if(w->init && w->draw_image && img) {
        int format_change = (w->src_format != img->format &&
                             w->format != img->format);
        if(format_change) {
            _zbar_best_format(img->format, &w->format, w->formats);
            if(!w->format)
                rc = err_capture_int(w, SEV_ERROR, ZBAR_ERR_UNSUPPORTED, __func__,
                                     "no conversion from %x to supported formats",
                                     img->format);
            w->src_format = img->format;
        }

        if(!rc && (format_change || !w->scaled_size.x || !w->dst_width)) {
            zprintf(24, "init: src=%.4s(%08x) %dx%d dst=%.4s(%08x) %dx%d\n",
                    (char*)&w->src_format, w->src_format,
                    w->src_width, w->src_height,
                    (char*)&w->format, w->format,
                    w->dst_width, w->dst_height);
            if(!w->dst_width) {
                w->src_width = img->width;
                w->src_height = img->height;
            }

            point_t size = { w->width, w->height };
            if(size.x > w->max_width)
                size.x = w->max_width;
            if(size.y > w->max_height)
                size.y = w->max_height;

            if(size.x * w->src_height < size.y * w->src_width) {
                w->scale_num = size.x;
                w->scale_den = w->src_width;
            }
            else {
                w->scale_num = size.y;
                w->scale_den = w->src_height;
            }

            rc = w->init(w, img, format_change);

            if(!rc) {
                size.x = w->src_width;
                size.y = w->src_height;
                w->scaled_size = size = window_scale_pt(w, size);
                w->scaled_offset.x = ((int)w->width - size.x) / 2;
                w->scaled_offset.y = ((int)w->height - size.y) / 2;
                zprintf(24, "scale: src=%dx%d win=%dx%d by %d/%d => %dx%d @%d,%d\n",
                        w->src_width, w->src_height, w->width, w->height,
                        w->scale_num, w->scale_den,
                        size.x, size.y, w->scaled_offset.x, w->scaled_offset.y);
            }
            else {
                /* unable to display this image */
                _zbar_image_refcnt(img, -1);
                w->image = img = NULL;
            }
        }

        if(!rc &&
           (img->format != w->format ||
            img->width != w->dst_width ||
            img->height != w->dst_height)) {
            /* save *converted* image for redraw */
            zprintf(48, "convert: %.4s(%08x) %dx%d => %.4s(%08x) %dx%d\n",
                    (char*)&img->format, img->format, img->width, img->height,
                    (char*)&w->format, w->format, w->dst_width, w->dst_height);
            w->image = zbar_image_convert_resize(img, w->format,
                                                 w->dst_width, w->dst_height);
            w->image->syms = img->syms;
            if(img->syms)
                zbar_symbol_set_ref(img->syms, 1);
            zbar_image_destroy(img);
            img = w->image;
        }

        if(!rc) {
            rc = w->draw_image(w, img);

            point_t org = w->scaled_offset;
            if(org.x > 0) {
                point_t p = { 0, org.y };
                point_t s = { org.x, w->scaled_size.y };
                _zbar_window_fill_rect(w, 0, p, s);
                s.x = w->width - w->scaled_size.x - s.x;
                if(s.x > 0) {
                    p.x = w->width - s.x;
                    _zbar_window_fill_rect(w, 0, p, s);
                }
            }
            if(org.y > 0) {
                point_t p = { 0, 0 };
                point_t s = { w->width, org.y };
                _zbar_window_fill_rect(w, 0, p, s);
                s.y = w->height - w->scaled_size.y - s.y;
                if(s.y > 0) {
                    p.y = w->height - s.y;
                    _zbar_window_fill_rect(w, 0, p, s);
                }
            }
        }
        if(!rc)
            rc = window_draw_overlay(w);
    }
    else
        rc = 1;

    if(rc)
        rc = _zbar_window_draw_logo(w);

    _zbar_window_end(w);
    (void)window_unlock(w);
    return(rc);
}


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