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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_vertical_line_draw 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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/* Vertical line draw function for 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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/* ystart y-coord of top endpoint */ |
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/* yend y-coord of bottom endpoint */ |
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/* xpos x-coord of left edge */ |
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/* width width of the line */ |
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/* color Color of line 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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/* None */ |
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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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103424 |
VOID _gx_display_driver_4bpp_vertical_line_draw(GX_DRAW_CONTEXT *context, INT ystart, INT yend, INT xpos, INT width, GX_COLOR color) |
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{ |
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INT row; |
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INT column; |
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GX_UBYTE *put; |
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GX_UBYTE *putrow; |
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GX_UBYTE mask; |
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GX_UBYTE pixel; |
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INT stride; |
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/* Get row pitch in bytes. */ |
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stride = (context -> gx_draw_context_pitch + 1) >> 1; |
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pixel = (GX_UBYTE)(color & 0x0f); |
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pixel |= (GX_UBYTE)(pixel << 4); |
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/* pick up starting address of canvas memory */ |
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putrow = (GX_UBYTE *)context -> gx_draw_context_memory; |
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putrow += ystart * stride; |
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putrow += (xpos >> 1); |
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/* draw line from top to bottom */ |
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✓✓ |
6926731 |
for (row = ystart; row <= yend; row++) |
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{ |
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6823307 |
put = putrow; |
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✓✓ |
6823307 |
if (xpos & 0x01) |
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{ |
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4097033 |
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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/* draw line width from left to right */ |
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✓✓ |
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for (column = 0; column < width;) |
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{ |
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✓✓✓✓
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if ((mask == 0xf0) && (width - column >= 2)) |
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{ |
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364620 |
*put++ = pixel; |
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column += 2; |
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} |
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else |
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{ |
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/* Set bits first */ |
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*put &= (GX_UBYTE)(~mask); |
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*put |= (pixel & mask); |
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mask >>= 4; |
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✓✓ |
6824191 |
if (mask == 0) |
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{ |
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4097033 |
put++; |
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mask = 0xf0; |
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} |
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column++; |
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} |
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} |
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/* advance to the next scaneline */ |
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putrow += stride; |
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} |
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103424 |
} |
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