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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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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_display_driver_4bpp_pixel_write 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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/* Pixel write function for the 4bpp display driver. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* context Drawing context */ |
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/* x X coordinate */ |
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/* y Y coordinate */ |
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/* color Color of pixel to write */ |
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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_display_driver_4bpp_pixel_write Calculate row pitch */ |
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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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/* */ |
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/**************************************************************************/ |
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172271 |
VOID _gx_display_driver_4bpp_pixel_write(GX_DRAW_CONTEXT *context, INT x, INT y, GX_COLOR color) |
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{ |
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GX_UBYTE *put = (GX_UBYTE *)context -> gx_draw_context_memory; |
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GX_UBYTE mask; |
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UINT stride; |
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GX_UBYTE put_color; |
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/* Get row pitch in bytes. */ |
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stride = _gx_display_driver_4bpp_row_pitch_get((USHORT)(context -> gx_draw_context_pitch)); |
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put_color = color & 0x0f; |
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put_color |= (GX_UBYTE)(put_color << 4); |
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/* Calculate address of writing byte. */ |
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put = (GX_UBYTE *)((INT)put + y * (INT)stride); |
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put += x >> 1; |
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✓✓ |
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if (x & 0x01) |
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{ |
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mask = 0x0f; |
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} |
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else |
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{ |
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mask = 0xf0; |
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} |
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*put &= (GX_UBYTE)(~mask); |
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*put |= mask & put_color; |
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} |
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