/*
 * Copyright © 2014 Intel Corporation
 * Copyright © 2011 Kristian Høgsberg
 *
 * 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.
 */

#include "xwayland.h"

#include <mipointer.h>

static DevPrivateKeyRec xwl_cursor_private_key;

static void
expand_source_and_mask(CursorPtr cursor, CARD32 *data)
{
    CARD32 *p, d, fg, bg;
    CursorBitsPtr bits = cursor->bits;
    int x, y, stride, i, bit;

    p = data;
    fg = ((cursor->foreRed & 0xff00) << 8) |
        (cursor->foreGreen & 0xff00) | (cursor->foreGreen >> 8);
    bg = ((cursor->backRed & 0xff00) << 8) |
        (cursor->backGreen & 0xff00) | (cursor->backGreen >> 8);
    stride = BitmapBytePad(bits->width);
    for (y = 0; y < bits->height; y++)
        for (x = 0; x < bits->width; x++) {
            i = y * stride + x / 8;
            bit = 1 << (x & 7);
            if (bits->source[i] & bit)
                d = fg;
            else
                d = bg;
            if (bits->mask[i] & bit)
                d |= 0xff000000;
            else
                d = 0x00000000;

            *p++ = d;
        }
}

static Bool
xwl_realize_cursor(DeviceIntPtr device, ScreenPtr screen, CursorPtr cursor)
{
    PixmapPtr pixmap;

    pixmap = xwl_shm_create_pixmap(screen, cursor->bits->width,
                                   cursor->bits->height, 32, 0);
    dixSetPrivate(&cursor->devPrivates, &xwl_cursor_private_key, pixmap);

    return TRUE;
}

static Bool
xwl_unrealize_cursor(DeviceIntPtr device, ScreenPtr screen, CursorPtr cursor)
{
    PixmapPtr pixmap;
    struct xwl_screen *xwl_screen;
    struct xwl_seat *xwl_seat;

    pixmap = dixGetPrivate(&cursor->devPrivates, &xwl_cursor_private_key);
    if (!pixmap)
        return TRUE;

    dixSetPrivate(&cursor->devPrivates, &xwl_cursor_private_key, NULL);

    /* When called from FreeCursor(), device is always NULL */
    xwl_screen = xwl_screen_get(screen);
    xorg_list_for_each_entry(xwl_seat, &xwl_screen->seat_list, link) {
        if (cursor == xwl_seat->x_cursor)
            xwl_seat->x_cursor = NULL;
    }

    return xwl_shm_destroy_pixmap(pixmap);
}

static void
clear_cursor_frame_callback(struct xwl_seat *xwl_seat)
{
   if (xwl_seat->cursor_frame_cb) {
       wl_callback_destroy (xwl_seat->cursor_frame_cb);
       xwl_seat->cursor_frame_cb = NULL;
   }
}

static void
frame_callback(void *data,
               struct wl_callback *callback,
               uint32_t time)
{
    struct xwl_seat *xwl_seat = data;

    clear_cursor_frame_callback(xwl_seat);
    if (xwl_seat->cursor_needs_update) {
        xwl_seat->cursor_needs_update = FALSE;
        xwl_seat_set_cursor(xwl_seat);
    }
}

static const struct wl_callback_listener frame_listener = {
    frame_callback
};

void
xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
{
    PixmapPtr pixmap;
    CursorPtr cursor;
    int stride;

    if (!xwl_seat->wl_pointer)
        return;

    if (!xwl_seat->x_cursor) {
        wl_pointer_set_cursor(xwl_seat->wl_pointer,
                              xwl_seat->pointer_enter_serial, NULL, 0, 0);
        clear_cursor_frame_callback(xwl_seat);
        xwl_seat->cursor_needs_update = FALSE;
        return;
    }

    if (xwl_seat->cursor_frame_cb) {
        xwl_seat->cursor_needs_update = TRUE;
        return;
    }

    cursor = xwl_seat->x_cursor;
    pixmap = dixGetPrivate(&cursor->devPrivates, &xwl_cursor_private_key);
    if (!pixmap)
        return;

    stride = cursor->bits->width * 4;
    if (cursor->bits->argb)
        memcpy(pixmap->devPrivate.ptr,
               cursor->bits->argb, cursor->bits->height * stride);
    else
        expand_source_and_mask(cursor, pixmap->devPrivate.ptr);

    wl_pointer_set_cursor(xwl_seat->wl_pointer,
                          xwl_seat->pointer_enter_serial,
                          xwl_seat->cursor,
                          xwl_seat->x_cursor->bits->xhot,
                          xwl_seat->x_cursor->bits->yhot);
    wl_surface_attach(xwl_seat->cursor,
                      xwl_shm_pixmap_get_wl_buffer(pixmap), 0, 0);
    wl_surface_damage(xwl_seat->cursor, 0, 0,
                      xwl_seat->x_cursor->bits->width,
                      xwl_seat->x_cursor->bits->height);

    xwl_seat->cursor_frame_cb = wl_surface_frame(xwl_seat->cursor);
    wl_callback_add_listener(xwl_seat->cursor_frame_cb, &frame_listener, xwl_seat);

    wl_surface_commit(xwl_seat->cursor);
}

static void
xwl_set_cursor(DeviceIntPtr device,
               ScreenPtr screen, CursorPtr cursor, int x, int y)
{
    struct xwl_seat *xwl_seat;
    Bool cursor_visibility_changed;

    xwl_seat = device->public.devicePrivate;
    if (xwl_seat == NULL)
        return;

    cursor_visibility_changed = !!xwl_seat->x_cursor ^ !!cursor;

    xwl_seat->x_cursor = cursor;

    if (cursor_visibility_changed)
        xwl_seat_cursor_visibility_changed(xwl_seat);

    xwl_seat_set_cursor(xwl_seat);
}

static void
xwl_move_cursor(DeviceIntPtr device, ScreenPtr screen, int x, int y)
{
}

static Bool
xwl_device_cursor_initialize(DeviceIntPtr device, ScreenPtr screen)
{
    return TRUE;
}

static void
xwl_device_cursor_cleanup(DeviceIntPtr device, ScreenPtr screen)
{
}

static miPointerSpriteFuncRec xwl_pointer_sprite_funcs = {
    xwl_realize_cursor,
    xwl_unrealize_cursor,
    xwl_set_cursor,
    xwl_move_cursor,
    xwl_device_cursor_initialize,
    xwl_device_cursor_cleanup
};

static Bool
xwl_cursor_off_screen(ScreenPtr *ppScreen, int *x, int *y)
{
    return FALSE;
}

static void
xwl_cross_screen(ScreenPtr pScreen, Bool entering)
{
}

static void
xwl_pointer_warp_cursor(DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y)
{
    miPointerWarpCursor(pDev, pScreen, x, y);
}

static miPointerScreenFuncRec xwl_pointer_screen_funcs = {
    xwl_cursor_off_screen,
    xwl_cross_screen,
    xwl_pointer_warp_cursor
};

Bool
xwl_screen_init_cursor(struct xwl_screen *xwl_screen)
{
    if (!dixRegisterPrivateKey(&xwl_cursor_private_key, PRIVATE_CURSOR_BITS, 0))
        return FALSE;

    return miPointerInitialize(xwl_screen->screen,
                               &xwl_pointer_sprite_funcs,
                               &xwl_pointer_screen_funcs, TRUE);
}