/*
 *  gstvaapiwindow.c - VA window abstraction
 *
 *  Copyright (C) 2010-2011 Splitted-Desktop Systems
 *  Copyright (C) 2011-2012 Intel Corporation
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1
 *  of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301 USA
 */

/**
 * SECTION:gstvaapiwindow
 * @short_description: VA window abstraction
 */

#include "sysdeps.h"
#include "gstvaapiwindow.h"
#include "gstvaapiwindow_priv.h"

#define DEBUG 1
#include "gstvaapidebug.h"

/* Ensure those symbols are actually defined in the resulting libraries */
#undef gst_vaapi_window_ref
#undef gst_vaapi_window_unref
#undef gst_vaapi_window_replace

static void
gst_vaapi_window_ensure_size(GstVaapiWindow *window)
{
    const GstVaapiWindowClass * const klass =
        GST_VAAPI_WINDOW_GET_CLASS(window);

    if (!window->check_geometry)
        return;

    if (klass->get_geometry)
        klass->get_geometry(window, NULL, NULL,
            &window->width, &window->height);

    window->check_geometry = FALSE;
    window->is_fullscreen  = (window->width  == window->display_width &&
                              window->height == window->display_height);
}

static gboolean
gst_vaapi_window_create(GstVaapiWindow *window, guint width, guint height)
{
    gst_vaapi_display_get_size(
        GST_VAAPI_OBJECT_DISPLAY(window),
        &window->display_width,
        &window->display_height
    );

    if (!GST_VAAPI_WINDOW_GET_CLASS(window)->create(window, &width, &height))
        return FALSE;

    if (width != window->width || height != window->height) {
        GST_DEBUG("backend resized window to %ux%u", width, height);
        window->width  = width;
        window->height = height;
    }
    return TRUE;
}

GstVaapiWindow *
gst_vaapi_window_new(const GstVaapiWindowClass *window_class,
    GstVaapiDisplay *display, guint width, guint height)
{
    GstVaapiWindow *window;

    g_return_val_if_fail(width  > 0, NULL);
    g_return_val_if_fail(height > 0, NULL);

    window = gst_vaapi_object_new(GST_VAAPI_OBJECT_CLASS(window_class),
        display);
    if (!window)
        return NULL;

    GST_VAAPI_OBJECT_ID(window) = 0;
    if (!gst_vaapi_window_create(window, width, height))
        goto error;
    return window;

error:
    gst_vaapi_window_unref_internal(window);
    return NULL;
}

GstVaapiWindow *
gst_vaapi_window_new_from_native(const GstVaapiWindowClass *window_class,
    GstVaapiDisplay *display, gpointer native_window)
{
    GstVaapiWindow *window;

    window = gst_vaapi_object_new(GST_VAAPI_OBJECT_CLASS(window_class),
        display);
    if (!window)
        return NULL;

    GST_VAAPI_OBJECT_ID(window) = GPOINTER_TO_SIZE(native_window);
    window->use_foreign_window = TRUE;
    if (!gst_vaapi_window_create(window, 0, 0))
        goto error;
    return window;

error:
    gst_vaapi_window_unref_internal(window);
    return NULL;
}

/**
 * gst_vaapi_window_ref:
 * @window: a #GstVaapiWindow
 *
 * Atomically increases the reference count of the given @window by one.
 *
 * Returns: The same @window argument
 */
GstVaapiWindow *
gst_vaapi_window_ref(GstVaapiWindow *window)
{
    return gst_vaapi_window_ref_internal(window);
}

/**
 * gst_vaapi_window_unref:
 * @window: a #GstVaapiWindow
 *
 * Atomically decreases the reference count of the @window by one. If
 * the reference count reaches zero, the window will be free'd.
 */
void
gst_vaapi_window_unref(GstVaapiWindow *window)
{
    gst_vaapi_window_unref_internal(window);
}

/**
 * gst_vaapi_window_replace:
 * @old_window_ptr: a pointer to a #GstVaapiWindow
 * @new_window: a #GstVaapiWindow
 *
 * Atomically replaces the window window held in @old_window_ptr with
 * @new_window. This means that @old_window_ptr shall reference a
 * valid window. However, @new_window can be NULL.
 */
void
gst_vaapi_window_replace(GstVaapiWindow **old_window_ptr,
    GstVaapiWindow *new_window)
{
    gst_vaapi_window_replace_internal(old_window_ptr, new_window);
}

/**
 * gst_vaapi_window_get_display:
 * @window: a #GstVaapiWindow
 *
 * Returns the #GstVaapiDisplay this @window is bound to.
 *
 * Return value: the parent #GstVaapiDisplay object
 */
GstVaapiDisplay *
gst_vaapi_window_get_display(GstVaapiWindow *window)
{
    g_return_val_if_fail(window != NULL, NULL);

    return GST_VAAPI_OBJECT_DISPLAY(window);
}

/**
 * gst_vaapi_window_show:
 * @window: a #GstVaapiWindow
 *
 * Flags a window to be displayed. Any window that is not shown will
 * not appear on the screen.
 */
void
gst_vaapi_window_show(GstVaapiWindow *window)
{
    g_return_if_fail(window != NULL);

    GST_VAAPI_WINDOW_GET_CLASS(window)->show(window);
    window->check_geometry = TRUE;
}

/**
 * gst_vaapi_window_hide:
 * @window: a #GstVaapiWindow
 *
 * Reverses the effects of gst_vaapi_window_show(), causing the window
 * to be hidden (invisible to the user).
 */
void
gst_vaapi_window_hide(GstVaapiWindow *window)
{
    g_return_if_fail(window != NULL);

    GST_VAAPI_WINDOW_GET_CLASS(window)->hide(window);
}

/**
 * gst_vaapi_window_get_fullscreen:
 * @window: a #GstVaapiWindow
 *
 * Retrieves whether the @window is fullscreen or not
 *
 * Return value: %TRUE if the window is fullscreen
 */
gboolean
gst_vaapi_window_get_fullscreen(GstVaapiWindow *window)
{
    g_return_val_if_fail(window != NULL, FALSE);

    gst_vaapi_window_ensure_size(window);

    return window->is_fullscreen;
}

/**
 * gst_vaapi_window_set_fullscreen:
 * @window: a #GstVaapiWindow
 * @fullscreen: %TRUE to request window to get fullscreen
 *
 * Requests to place the @window in fullscreen or unfullscreen states.
 */
void
gst_vaapi_window_set_fullscreen(GstVaapiWindow *window, gboolean fullscreen)
{
    const GstVaapiWindowClass *klass;

    g_return_if_fail(window != NULL);

    klass = GST_VAAPI_WINDOW_GET_CLASS(window);

    if (window->is_fullscreen != fullscreen &&
        klass->set_fullscreen && klass->set_fullscreen(window, fullscreen)) {
        window->is_fullscreen  = fullscreen;
        window->check_geometry = TRUE;
    }
}

/**
 * gst_vaapi_window_get_width:
 * @window: a #GstVaapiWindow
 *
 * Retrieves the width of a #GstVaapiWindow.
 *
 * Return value: the width of the @window, in pixels
 */
guint
gst_vaapi_window_get_width(GstVaapiWindow *window)
{
    g_return_val_if_fail(window != NULL, 0);

    gst_vaapi_window_ensure_size(window);

    return window->width;
}

/**
 * gst_vaapi_window_get_height:
 * @window: a #GstVaapiWindow
 *
 * Retrieves the height of a #GstVaapiWindow
 *
 * Return value: the height of the @window, in pixels
 */
guint
gst_vaapi_window_get_height(GstVaapiWindow *window)
{
    g_return_val_if_fail(window != NULL, 0);

    gst_vaapi_window_ensure_size(window);

    return window->height;
}

/**
 * gst_vaapi_window_get_size:
 * @window: a #GstVaapiWindow
 * @pwidth: return location for the width, or %NULL
 * @pheight: return location for the height, or %NULL
 *
 * Retrieves the dimensions of a #GstVaapiWindow.
 */
void
gst_vaapi_window_get_size(GstVaapiWindow *window, guint *pwidth, guint *pheight)
{
    g_return_if_fail(window != NULL);

    gst_vaapi_window_ensure_size(window);

    if (pwidth)
        *pwidth = window->width;

    if (pheight)
        *pheight = window->height;
}

/**
 * gst_vaapi_window_set_width:
 * @window: a #GstVaapiWindow
 * @width: requested new width for the window, in pixels
 *
 * Resizes the @window to match the specified @width.
 */
void
gst_vaapi_window_set_width(GstVaapiWindow *window, guint width)
{
    g_return_if_fail(window != NULL);

    gst_vaapi_window_set_size(window, width, window->height);
}

/**
 * gst_vaapi_window_set_height:
 * @window: a #GstVaapiWindow
 * @height: requested new height for the window, in pixels
 *
 * Resizes the @window to match the specified @height.
 */
void
gst_vaapi_window_set_height(GstVaapiWindow *window, guint height)
{
    g_return_if_fail(window != NULL);

    gst_vaapi_window_set_size(window, window->width, height);
}

/**
 * gst_vaapi_window_set_size:
 * @window: a #GstVaapiWindow
 * @width: requested new width for the window, in pixels
 * @height: requested new height for the window, in pixels
 *
 * Resizes the @window to match the specified @width and @height.
 */
void
gst_vaapi_window_set_size(GstVaapiWindow *window, guint width, guint height)
{
    g_return_if_fail(window != NULL);

    if (width == window->width && height == window->height)
        return;

    if (!GST_VAAPI_WINDOW_GET_CLASS(window)->resize(window, width, height))
        return;

    window->width  = width;
    window->height = height;
}

static inline void
get_surface_rect(GstVaapiSurface *surface, GstVaapiRectangle *rect)
{
    guint width, height;

    gst_vaapi_surface_get_size(surface, &width, &height);
    rect->x      = 0;
    rect->y      = 0;
    rect->width  = width;
    rect->height = height;
}

static inline void
get_window_rect(GstVaapiWindow *window, GstVaapiRectangle *rect)
{
    guint width, height;

    gst_vaapi_window_get_size(window, &width, &height);
    rect->x      = 0;
    rect->y      = 0;
    rect->width  = width;
    rect->height = height;
}

/**
 * gst_vaapi_window_put_surface:
 * @window: a #GstVaapiWindow
 * @surface: a #GstVaapiSurface
 * @src_rect: the sub-rectangle of the source surface to
 *   extract and process. If %NULL, the entire surface will be used.
 * @dst_rect: the sub-rectangle of the destination
 *   window into which the surface is rendered. If %NULL, the entire
 *   window will be used.
 * @flags: postprocessing flags. See #GstVaapiSurfaceRenderFlags
 *
 * Renders the @surface region specified by @src_rect into the @window
 * region specified by @dst_rect. The @flags specify how de-interlacing
 * (if needed), color space conversion, scaling and other postprocessing
 * transformations are performed.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_window_put_surface(
    GstVaapiWindow          *window,
    GstVaapiSurface         *surface,
    const GstVaapiRectangle *src_rect,
    const GstVaapiRectangle *dst_rect,
    guint                    flags
)
{
    const GstVaapiWindowClass *klass;
    GstVaapiRectangle src_rect_default, dst_rect_default;

    g_return_val_if_fail(window != NULL, FALSE);
    g_return_val_if_fail(surface != NULL, FALSE);

    klass = GST_VAAPI_WINDOW_GET_CLASS(window);
    if (!klass->render)
        return FALSE;

    if (!src_rect) {
        src_rect = &src_rect_default;
        get_surface_rect(surface, &src_rect_default);
    }

    if (!dst_rect) {
        dst_rect = &dst_rect_default;
        get_window_rect(window, &dst_rect_default);
    }

    return klass->render(window, surface, src_rect, dst_rect, flags);
}