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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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/** 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_pattern_line_draw PORTABLE C */ |
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/* 6.1.7 */ |
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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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/* */ |
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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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/**************************************************************************/ |
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VOID _gx_display_driver_4bpp_vertical_pattern_line_draw(GX_DRAW_CONTEXT *context, INT ystart, INT yend, INT xpos) |
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{ |
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INT row; |
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GX_UBYTE *put; |
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GX_UBYTE *putrow; |
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ULONG pattern; |
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ULONG pattern_mask; |
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GX_UBYTE on_color; |
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GX_UBYTE off_color; |
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GX_UBYTE draw_mask; |
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INT stride; |
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/* pick up row pitch in bytes. */ |
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stride = (context -> gx_draw_context_pitch + 1) >> 1; |
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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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/* pick up the requested pattern and mask */ |
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pattern = context -> gx_draw_context_brush.gx_brush_line_pattern; |
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pattern_mask = context -> gx_draw_context_brush.gx_brush_pattern_mask; |
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on_color = (GX_UBYTE)context -> gx_draw_context_brush.gx_brush_line_color & 0x0f; |
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on_color |= (GX_UBYTE)(on_color << 4); |
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off_color = (GX_UBYTE)context -> gx_draw_context_brush.gx_brush_fill_color & 0x0f; |
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off_color |= (GX_UBYTE)(off_color << 4); |
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/* draw line from top to bottom */ |
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✓✓ |
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for (row = ystart; row <= yend; row++) |
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{ |
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put = putrow; |
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✓✓ |
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if (xpos & 0x01) |
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{ |
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draw_mask = 0x0f; |
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} |
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else |
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{ |
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draw_mask = 0xf0; |
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} |
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/* Set bits to 0 first */ |
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*put &= (GX_UBYTE)(~draw_mask); |
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/* Set bits color */ |
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✓✓ |
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if (pattern & pattern_mask) |
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{ |
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*put |= (on_color & draw_mask); |
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} |
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else |
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{ |
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*put |= (off_color & draw_mask); |
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} |
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pattern_mask >>= 1; |
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✓✓ |
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if (!pattern_mask) |
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{ |
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pattern_mask = 0x80000000; |
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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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/* save current masks value back to brush */ |
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context -> gx_draw_context_brush.gx_brush_pattern_mask = pattern_mask; |
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} |
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