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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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/** Display Management (Display) */ |
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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_display.h" |
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#include "gx_utility.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_display_driver_16bpp_canvas_copy PORTABLE C */ |
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/* 6.3.0 */ |
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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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/* Generic 16bpp canvas copy function. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* canvas The canvas to copy from */ |
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/* composite The canvas to copy to */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_utility_rectangle_shift Move the rectangle */ |
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/* _gx_utility_rectangle_overlap_detect Detect two rectangles being */ |
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/* overlap to each other */ |
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/* memcpy Move canvas data */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* GUIX Internal Code */ |
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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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/* 10-31-2023 Ting Zhu Modified comment(s), */ |
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/* added canvas status check, */ |
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/* resulting in version 6.3.0 */ |
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/* */ |
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/**************************************************************************/ |
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VOID _gx_display_driver_16bpp_canvas_copy(GX_CANVAS *canvas, GX_CANVAS *composite) |
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{ |
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GX_RECTANGLE dirty; |
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GX_RECTANGLE overlap; |
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USHORT *read; |
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USHORT *write; |
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INT width; |
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INT row; |
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#ifdef GX_ENABLE_CANVAS_PARTIAL_FRAME_BUFFER |
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if (canvas -> gx_canvas_status & GX_CANVAS_PARTIAL_FRAME_BUFFER) |
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{ |
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/* Not supported. */ |
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return; |
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} |
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#endif |
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dirty.gx_rectangle_left = dirty.gx_rectangle_top = 0; |
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dirty.gx_rectangle_right = (GX_VALUE)(canvas -> gx_canvas_x_resolution - (GX_VALUE)1); |
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dirty.gx_rectangle_bottom = (GX_VALUE)(canvas -> gx_canvas_y_resolution - (GX_VALUE)1); |
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_gx_utility_rectangle_shift(&dirty, canvas -> gx_canvas_display_offset_x, canvas -> gx_canvas_display_offset_y); |
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✓✓ |
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if (_gx_utility_rectangle_overlap_detect(&dirty, &composite -> gx_canvas_dirty_area, &overlap)) |
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{ |
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width = overlap.gx_rectangle_right - overlap.gx_rectangle_left + 1; |
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read = (USHORT *)canvas -> gx_canvas_memory; |
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/* index into starting row */ |
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read += (overlap.gx_rectangle_top - dirty.gx_rectangle_top) * canvas -> gx_canvas_x_resolution; |
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/* index into pixel */ |
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read += overlap.gx_rectangle_left - dirty.gx_rectangle_left; |
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/* calculate the write pointer */ |
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write = (USHORT *)composite -> gx_canvas_memory; |
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write += overlap.gx_rectangle_top * composite -> gx_canvas_x_resolution; |
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write += overlap.gx_rectangle_left; |
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✓✓ |
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for (row = overlap.gx_rectangle_top; row <= overlap.gx_rectangle_bottom; row++) |
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{ |
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memcpy(write, read, (size_t)(width * 2)); /* Use case of memcpy is verified. */ |
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write += composite -> gx_canvas_x_resolution; |
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read += canvas -> gx_canvas_x_resolution; |
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} |
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} |
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} |
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