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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** Canvas Management (Canvas) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_system.h" |
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#include "gx_utility.h" |
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#include "gx_canvas.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_canvas_alpha_set PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function assigns the alpha-blend value of a canvas */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* canvas Canvas control block */ |
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/* alpha alpha value */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_canvas_dirty_mark Set the canvas dirty flag */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* _gx_animation_start */ |
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/* _gx_animation_update */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ |
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/* 09-30-2020 Kenneth Maxwell Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_canvas_alpha_set(GX_CANVAS *canvas, GX_UBYTE alpha) |
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{ |
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VOID (*alpha_set)(INT layer, GX_UBYTE alpha); |
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/* change the alpha value */ |
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canvas -> gx_canvas_alpha = alpha; |
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✓✓ |
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if (canvas -> gx_canvas_hardware_layer >= 0) |
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{ |
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alpha_set = canvas -> gx_canvas_display -> gx_display_layer_services -> gx_display_layer_alpha_set; |
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✓✓ |
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if (alpha_set) |
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{ |
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alpha_set(canvas -> gx_canvas_hardware_layer, alpha); |
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return(GX_SUCCESS); |
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} |
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} |
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/* mark the canvas dirty so that it get refreshed */ |
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_gx_canvas_dirty_mark(canvas, GX_NULL); |
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/* Return successful status. */ |
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return(GX_SUCCESS); |
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} |
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