1 /*************************************************************************** 2 * Copyright (c) 2024 Microsoft Corporation 3 * 4 * This program and the accompanying materials are made available under the 5 * terms of the MIT License which is available at 6 * https://opensource.org/licenses/MIT. 7 * 8 * SPDX-License-Identifier: MIT 9 **************************************************************************/ 10 11 12 /**************************************************************************/ 13 /**************************************************************************/ 14 /** */ 15 /** GUIX Component */ 16 /** */ 17 /** Display Management (Display) */ 18 /** */ 19 /**************************************************************************/ 20 21 #define GX_SOURCE_CODE 22 23 24 /* Include necessary system files. */ 25 26 #include "gx_api.h" 27 #include "gx_system.h" 28 #include "gx_utility.h" 29 #include "gx_display.h" 30 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _gx_display_driver_8bpp_glyph_4bit_draw PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Kenneth Maxwell, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This draws the specified text using the current context, */ 45 /* clipped to one viewport */ 46 /* */ 47 /* INPUT */ 48 /* */ 49 /* context Draw context */ 50 /* draw_position The X and Y coordinate where */ 51 /* the glyph is drawn to */ 52 /* string String to draw */ 53 /* count Count of string characters */ 54 /* view view to clip drawing within */ 55 /* */ 56 /* OUTPUT */ 57 /* */ 58 /* None */ 59 /* */ 60 /* CALLS */ 61 /* */ 62 /* None */ 63 /* */ 64 /* CALLED BY */ 65 /* */ 66 /* _gx_canvas_text_draw */ 67 /* */ 68 /* RELEASE HISTORY */ 69 /* */ 70 /* DATE NAME DESCRIPTION */ 71 /* */ 72 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ 73 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */ 74 /* resulting in version 6.1 */ 75 /* */ 76 /**************************************************************************/ _gx_display_driver_8bpp_glyph_4bit_draw(GX_DRAW_CONTEXT * context,GX_RECTANGLE * draw_area,GX_POINT * map_offset,GX_CONST GX_GLYPH * glyph)77VOID _gx_display_driver_8bpp_glyph_4bit_draw(GX_DRAW_CONTEXT *context, GX_RECTANGLE *draw_area, GX_POINT *map_offset, GX_CONST GX_GLYPH *glyph) 78 { 79 GX_UBYTE *glyph_row; 80 GX_UBYTE *glyph_data; 81 UINT row; 82 UINT pixel_width = 0; 83 UINT leading_pixel; 84 UINT trailing_pixel; 85 GX_UBYTE text_color; 86 UINT y_height; 87 GX_UBYTE alpha; 88 UINT pitch; 89 UINT index; 90 GX_UBYTE *put; 91 GX_UBYTE *draw_start; 92 93 text_color = (GX_UBYTE)(context -> gx_draw_context_brush.gx_brush_line_color + 15); 94 pixel_width = (UINT)(draw_area -> gx_rectangle_right - draw_area -> gx_rectangle_left + 1); 95 96 /* Find the width of the glyph */ 97 pitch = glyph -> gx_glyph_width; 98 /* Make it byte-aligned. */ 99 pitch = (pitch + 1) >> 1; 100 101 glyph_row = (GX_UBYTE *)glyph -> gx_glyph_map; 102 103 if (map_offset -> gx_point_y) 104 { 105 glyph_row = glyph_row + ((INT)pitch * map_offset -> gx_point_y); 106 } 107 108 glyph_row += (map_offset -> gx_point_x >> 1); 109 110 y_height = (UINT)(draw_area -> gx_rectangle_bottom - draw_area -> gx_rectangle_top + 1); 111 112 leading_pixel = (map_offset -> gx_point_x & 1); 113 114 pixel_width -= leading_pixel; 115 116 trailing_pixel = pixel_width & 1; 117 118 pixel_width = pixel_width >> 1; 119 120 121 draw_start = (GX_UBYTE *)context -> gx_draw_context_memory; 122 draw_start += context -> gx_draw_context_pitch * draw_area -> gx_rectangle_top; 123 draw_start += draw_area -> gx_rectangle_left; 124 125 for (row = 0; row < y_height; row++) 126 { 127 glyph_data = glyph_row; 128 129 put = draw_start; 130 131 if (leading_pixel) 132 { 133 alpha = (*glyph_data) & 0x0f; 134 135 *put = (GX_UBYTE)(text_color - alpha); 136 put++; 137 138 glyph_data++; 139 } 140 for (index = 0; index < pixel_width; index++) 141 { 142 alpha = (*glyph_data) & 0xf0; 143 144 *put = (GX_UBYTE)(text_color - (alpha >> 4)); 145 put++; 146 147 alpha = (*glyph_data) & 0x0f; 148 *put = (GX_UBYTE)(text_color - alpha); 149 put++; 150 glyph_data++; 151 } 152 153 if (trailing_pixel) 154 { 155 alpha = (*glyph_data) & 0xf0; 156 *put = (GX_UBYTE)(text_color - (alpha >> 4)); 157 put++; 158 } 159 160 glyph_row += pitch; 161 draw_start += context -> gx_draw_context_pitch; 162 } 163 } 164 165
