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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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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_delete 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 deletes 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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/* */ |
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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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/* memset Set control block and canvas */ |
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/* memory to zero */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_canvas_delete(GX_CANVAS *canvas) |
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{ |
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/* lock access to gx_system */ |
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GX_ENTER_CRITICAL |
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✓✓ |
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if (_gx_system_canvas_created_count > 0) |
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{ |
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✓✓ |
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if (canvas -> gx_canvas_created_previous) |
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{ |
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canvas -> gx_canvas_created_previous -> gx_canvas_created_next = canvas -> gx_canvas_created_next; |
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✓✓ |
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if (canvas -> gx_canvas_created_next) |
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{ |
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canvas -> gx_canvas_created_next -> gx_canvas_created_previous = canvas -> gx_canvas_created_previous; |
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} |
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} |
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else |
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{ |
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_gx_system_canvas_created_list = canvas -> gx_canvas_created_next; |
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✓✓ |
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if (_gx_system_canvas_created_list) |
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{ |
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_gx_system_canvas_created_list -> gx_canvas_created_previous = GX_NULL; |
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} |
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} |
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_gx_system_canvas_created_count--; |
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/* Only for Win32, we sometimes have to create module 4 aligned scratch memory buffer */ |
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#ifdef GX_TARGET_WIN32 |
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if (canvas -> gx_canvas_padded_memory != GX_NULL) |
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{ |
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free(canvas -> gx_canvas_padded_memory); |
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} |
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#endif |
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/* Clear the screen control block. */ |
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memset(canvas, 0, sizeof(GX_CANVAS)); |
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} |
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/* unlock gx_system. */ |
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GX_EXIT_CRITICAL |
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/* Return successful status. */ |
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return(GX_SUCCESS); |
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} |
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