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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_system.h" |
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#include "gx_utility.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_8bpp_glyph_4bit_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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/* This draws the specified text using the current context, */ |
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/* clipped to one viewport */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* context Draw context */ |
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/* draw_position The X and Y coordinate where */ |
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/* the glyph is drawn to */ |
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/* string String to draw */ |
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/* count Count of string characters */ |
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/* view view to clip drawing within */ |
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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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/* _gx_canvas_text_draw */ |
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/* */ |
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/**************************************************************************/ |
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VOID _gx_display_driver_8bpp_glyph_4bit_draw(GX_DRAW_CONTEXT *context, GX_RECTANGLE *draw_area, GX_POINT *map_offset, GX_CONST GX_GLYPH *glyph) |
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{ |
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GX_UBYTE *glyph_row; |
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GX_UBYTE *glyph_data; |
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UINT row; |
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UINT pixel_width = 0; |
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UINT leading_pixel; |
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UINT trailing_pixel; |
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GX_UBYTE text_color; |
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UINT y_height; |
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GX_UBYTE alpha; |
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UINT pitch; |
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UINT index; |
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GX_UBYTE *put; |
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GX_UBYTE *draw_start; |
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text_color = (GX_UBYTE)(context -> gx_draw_context_brush.gx_brush_line_color + 15); |
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pixel_width = (UINT)(draw_area -> gx_rectangle_right - draw_area -> gx_rectangle_left + 1); |
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/* Find the width of the glyph */ |
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pitch = glyph -> gx_glyph_width; |
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/* Make it byte-aligned. */ |
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pitch = (pitch + 1) >> 1; |
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glyph_row = (GX_UBYTE *)glyph -> gx_glyph_map; |
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✓✓ |
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if (map_offset -> gx_point_y) |
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{ |
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glyph_row = glyph_row + ((INT)pitch * map_offset -> gx_point_y); |
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} |
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glyph_row += (map_offset -> gx_point_x >> 1); |
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y_height = (UINT)(draw_area -> gx_rectangle_bottom - draw_area -> gx_rectangle_top + 1); |
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leading_pixel = (map_offset -> gx_point_x & 1); |
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pixel_width -= leading_pixel; |
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trailing_pixel = pixel_width & 1; |
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pixel_width = pixel_width >> 1; |
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draw_start = (GX_UBYTE *)context -> gx_draw_context_memory; |
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draw_start += context -> gx_draw_context_pitch * draw_area -> gx_rectangle_top; |
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draw_start += draw_area -> gx_rectangle_left; |
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✓✓ |
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for (row = 0; row < y_height; row++) |
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{ |
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glyph_data = glyph_row; |
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put = draw_start; |
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✓✓ |
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if (leading_pixel) |
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{ |
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alpha = (*glyph_data) & 0x0f; |
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*put = (GX_UBYTE)(text_color - alpha); |
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put++; |
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glyph_data++; |
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} |
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✓✓ |
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for (index = 0; index < pixel_width; index++) |
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{ |
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alpha = (*glyph_data) & 0xf0; |
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*put = (GX_UBYTE)(text_color - (alpha >> 4)); |
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put++; |
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alpha = (*glyph_data) & 0x0f; |
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*put = (GX_UBYTE)(text_color - alpha); |
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put++; |
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glyph_data++; |
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} |
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✓✓ |
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if (trailing_pixel) |
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{ |
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alpha = (*glyph_data) & 0xf0; |
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*put = (GX_UBYTE)(text_color - (alpha >> 4)); |
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put++; |
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} |
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glyph_row += pitch; |
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draw_start += context -> gx_draw_context_pitch; |
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} |
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} |
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