/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation 
 * 
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 * 
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** GUIX Component                                                        */
/**                                                                       */
/**   Canvas Management (Canvas)                                          */
/**                                                                       */
/**************************************************************************/

#define GX_SOURCE_CODE


/* Include necessary system files.  */

#include "gx_api.h"
#include "gx_system.h"
#include "gx_utility.h"
#include "gx_canvas.h"
#include "gx_port.h"

/* Bring in externs for caller checking code.  */
GX_CALLER_CHECKING_EXTERNS


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _gxe_canvas_alpha_set                               PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function checks for errors in the canvas alpha set function    */
/*    call.                                                               */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    canvas                                Canvas control block          */
/*    alpha                                 alpha value                   */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    status                                Completion status             */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _gx_canvas_alpha_set                  Actual canvas alpha set call  */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application Code                                                    */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
/*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
/*                                            resulting in version 6.1    */
/*                                                                        */
/**************************************************************************/
UINT  _gxe_canvas_alpha_set(GX_CANVAS *canvas, GX_UBYTE alpha)
{
UINT status;

    /* Check for appropriate caller.  */
    GX_INIT_AND_THREADS_CALLER_CHECKING

    /* Check for the invalid input pointers.  */
    if (canvas == GX_NULL)
    {
        return(GX_PTR_ERROR);
    }

    if (canvas ->gx_canvas_id != GX_CANVAS_ID)
    {
        return (GX_INVALID_CANVAS);
    }

    /* Call the actual canvas alpha set function.  */
    status = _gx_canvas_alpha_set(canvas, alpha);

    /* Return completion status.  */
    return status;
}