1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** GUIX Component */ 17 /** */ 18 /** Display Management (Display) */ 19 /** */ 20 /**************************************************************************/ 21 22 #define GX_SOURCE_CODE 23 24 25 /* Include necessary system files. */ 26 27 #include "gx_api.h" 28 #include "gx_system.h" 29 #include "gx_utility.h" 30 #include "gx_display.h" 31 32 33 /**************************************************************************/ 34 /* */ 35 /* FUNCTION RELEASE */ 36 /* */ 37 /* _gx_display_driver_8bpp_glyph_4bit_draw PORTABLE C */ 38 /* 6.1 */ 39 /* AUTHOR */ 40 /* */ 41 /* Kenneth Maxwell, Microsoft Corporation */ 42 /* */ 43 /* DESCRIPTION */ 44 /* */ 45 /* This draws the specified text using the current context, */ 46 /* clipped to one viewport */ 47 /* */ 48 /* INPUT */ 49 /* */ 50 /* context Draw context */ 51 /* draw_position The X and Y coordinate where */ 52 /* the glyph is drawn to */ 53 /* string String to draw */ 54 /* count Count of string characters */ 55 /* view view to clip drawing within */ 56 /* */ 57 /* OUTPUT */ 58 /* */ 59 /* None */ 60 /* */ 61 /* CALLS */ 62 /* */ 63 /* None */ 64 /* */ 65 /* CALLED BY */ 66 /* */ 67 /* _gx_canvas_text_draw */ 68 /* */ 69 /* RELEASE HISTORY */ 70 /* */ 71 /* DATE NAME DESCRIPTION */ 72 /* */ 73 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */ 74 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */ 75 /* resulting in version 6.1 */ 76 /* */ 77 /**************************************************************************/ _gx_display_driver_8bpp_glyph_4bit_draw(GX_DRAW_CONTEXT * context,GX_RECTANGLE * draw_area,GX_POINT * map_offset,GX_CONST GX_GLYPH * glyph)78VOID _gx_display_driver_8bpp_glyph_4bit_draw(GX_DRAW_CONTEXT *context, GX_RECTANGLE *draw_area, GX_POINT *map_offset, GX_CONST GX_GLYPH *glyph) 79 { 80 GX_UBYTE *glyph_row; 81 GX_UBYTE *glyph_data; 82 UINT row; 83 UINT pixel_width = 0; 84 UINT leading_pixel; 85 UINT trailing_pixel; 86 GX_UBYTE text_color; 87 UINT y_height; 88 GX_UBYTE alpha; 89 UINT pitch; 90 UINT index; 91 GX_UBYTE *put; 92 GX_UBYTE *draw_start; 93 94 text_color = (GX_UBYTE)(context -> gx_draw_context_brush.gx_brush_line_color + 15); 95 pixel_width = (UINT)(draw_area -> gx_rectangle_right - draw_area -> gx_rectangle_left + 1); 96 97 /* Find the width of the glyph */ 98 pitch = glyph -> gx_glyph_width; 99 /* Make it byte-aligned. */ 100 pitch = (pitch + 1) >> 1; 101 102 glyph_row = (GX_UBYTE *)glyph -> gx_glyph_map; 103 104 if (map_offset -> gx_point_y) 105 { 106 glyph_row = glyph_row + ((INT)pitch * map_offset -> gx_point_y); 107 } 108 109 glyph_row += (map_offset -> gx_point_x >> 1); 110 111 y_height = (UINT)(draw_area -> gx_rectangle_bottom - draw_area -> gx_rectangle_top + 1); 112 113 leading_pixel = (map_offset -> gx_point_x & 1); 114 115 pixel_width -= leading_pixel; 116 117 trailing_pixel = pixel_width & 1; 118 119 pixel_width = pixel_width >> 1; 120 121 122 draw_start = (GX_UBYTE *)context -> gx_draw_context_memory; 123 draw_start += context -> gx_draw_context_pitch * draw_area -> gx_rectangle_top; 124 draw_start += draw_area -> gx_rectangle_left; 125 126 for (row = 0; row < y_height; row++) 127 { 128 glyph_data = glyph_row; 129 130 put = draw_start; 131 132 if (leading_pixel) 133 { 134 alpha = (*glyph_data) & 0x0f; 135 136 *put = (GX_UBYTE)(text_color - alpha); 137 put++; 138 139 glyph_data++; 140 } 141 for (index = 0; index < pixel_width; index++) 142 { 143 alpha = (*glyph_data) & 0xf0; 144 145 *put = (GX_UBYTE)(text_color - (alpha >> 4)); 146 put++; 147 148 alpha = (*glyph_data) & 0x0f; 149 *put = (GX_UBYTE)(text_color - alpha); 150 put++; 151 glyph_data++; 152 } 153 154 if (trailing_pixel) 155 { 156 alpha = (*glyph_data) & 0xf0; 157 *put = (GX_UBYTE)(text_color - (alpha >> 4)); 158 put++; 159 } 160 161 glyph_row += pitch; 162 draw_start += context -> gx_draw_context_pitch; 163 } 164 } 165 166
