/*
 * Copyright © 2013 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "present_priv.h"
#include <gcstruct.h>

/*
 * Copies the update region from a pixmap to the target drawable
 */
void
present_copy_region(DrawablePtr drawable,
                    PixmapPtr pixmap,
                    RegionPtr update,
                    int16_t x_off,
                    int16_t y_off)
{
    ScreenPtr   screen = drawable->pScreen;
    GCPtr       gc;

    gc = GetScratchGC(drawable->depth, screen);
    if (update) {
        ChangeGCVal     changes[2];

        changes[0].val = x_off;
        changes[1].val = y_off;
        ChangeGC(serverClient, gc,
                 GCClipXOrigin|GCClipYOrigin,
                 changes);
        (*gc->funcs->ChangeClip)(gc, CT_REGION, update, 0);
    }
    ValidateGC(drawable, gc);
    (*gc->ops->CopyArea)(&pixmap->drawable,
                         drawable,
                         gc,
                         0, 0,
                         pixmap->drawable.width, pixmap->drawable.height,
                         x_off, y_off);
    if (update)
        (*gc->funcs->ChangeClip)(gc, CT_NONE, NULL, 0);
    FreeScratchGC(gc);
}

void
present_pixmap_idle(PixmapPtr pixmap, WindowPtr window, CARD32 serial, struct present_fence *present_fence)
{
    if (present_fence)
        present_fence_set_triggered(present_fence);
    if (window) {
        DebugPresent(("\ti %08lx\n", pixmap ? pixmap->drawable.id : 0));
        present_send_idle_notify(window, serial, pixmap, present_fence);
    }
}

struct pixmap_visit {
    PixmapPtr   old;
    PixmapPtr   new;
};

static int
present_set_tree_pixmap_visit(WindowPtr window, void *data)
{
    struct pixmap_visit *visit = data;
    ScreenPtr           screen = window->drawable.pScreen;

    if ((*screen->GetWindowPixmap)(window) != visit->old)
        return WT_DONTWALKCHILDREN;
    (*screen->SetWindowPixmap)(window, visit->new);
    return WT_WALKCHILDREN;
}

void
present_set_tree_pixmap(WindowPtr window,
                        PixmapPtr expected,
                        PixmapPtr pixmap)
{
    struct pixmap_visit visit;
    ScreenPtr           screen = window->drawable.pScreen;

    visit.old = (*screen->GetWindowPixmap)(window);
    if (expected && visit.old != expected)
        return;

    visit.new = pixmap;
    if (visit.old == visit.new)
        return;
    TraverseTree(window, present_set_tree_pixmap_visit, &visit);
}