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_rotated_glyph_3bit_draw PORTABLE C */ 37 /* 6.1.4 */ 38 /* AUTHOR */ 39 /* */ 40 /* Kenneth Maxwell, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This draws the specified 3bit glyph 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 /* 02-02-2021 Kenneth Maxwell Initial Version 6.1.4 */ 73 /* */ 74 /**************************************************************************/ _gx_display_driver_8bpp_rotated_glyph_3bit_draw(GX_DRAW_CONTEXT * context,GX_RECTANGLE * draw_area,GX_POINT * map_offset,GX_CONST GX_GLYPH * glyph)75VOID _gx_display_driver_8bpp_rotated_glyph_3bit_draw(GX_DRAW_CONTEXT *context, GX_RECTANGLE *draw_area, GX_POINT *map_offset, GX_CONST GX_GLYPH *glyph) 76 { 77 GX_UBYTE *glyph_row; 78 GX_UBYTE *glyph_data; 79 UINT row; 80 UINT pixel_width = 0; 81 UINT leading_pixel; 82 UINT trailing_pixel; 83 GX_UBYTE text_color; 84 UINT y_height; 85 GX_UBYTE alpha; 86 UINT pitch; 87 UINT index; 88 GX_UBYTE *put; 89 GX_UBYTE *draw_start; 90 GX_VALUE rotated_map_offset_x; 91 GX_VALUE rotated_map_offset_y; 92 GX_VALUE rotated_left; 93 GX_VALUE rotated_top; 94 95 text_color = (GX_UBYTE)(context -> gx_draw_context_brush.gx_brush_line_color + 7); 96 pixel_width = (UINT)(draw_area -> gx_rectangle_bottom - draw_area -> gx_rectangle_top + 1); 97 98 y_height = (UINT)(draw_area -> gx_rectangle_right - draw_area -> gx_rectangle_left + 1); 99 100 if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW) 101 { 102 rotated_left = draw_area -> gx_rectangle_top; 103 rotated_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - draw_area -> gx_rectangle_right - 1); 104 105 rotated_map_offset_x = map_offset -> gx_point_y; 106 rotated_map_offset_y = (GX_VALUE)(glyph -> gx_glyph_width - map_offset -> gx_point_x - (GX_VALUE)y_height); 107 } 108 else 109 { 110 rotated_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_display_offset_y - draw_area -> gx_rectangle_bottom - 1); 111 rotated_top = draw_area -> gx_rectangle_left; 112 113 rotated_map_offset_x = (GX_VALUE)(glyph -> gx_glyph_height - map_offset -> gx_point_y - (GX_VALUE)pixel_width); 114 rotated_map_offset_y = map_offset -> gx_point_x; 115 } 116 117 leading_pixel = (rotated_map_offset_x & 1); 118 119 pixel_width -= leading_pixel; 120 121 trailing_pixel = pixel_width & 1; 122 123 pixel_width = pixel_width >> 1; 124 125 /* Find the width of the glyph. */ 126 pitch = glyph -> gx_glyph_height; 127 128 /* Make it byte-aligned. */ 129 pitch = (pitch + 1) >> 1; 130 131 glyph_row = (GX_UBYTE *)glyph -> gx_glyph_map; 132 133 if (rotated_map_offset_y) 134 { 135 glyph_row = glyph_row + ((INT)pitch * rotated_map_offset_y); 136 } 137 138 glyph_row += (rotated_map_offset_x >> 1); 139 140 draw_start = (GX_UBYTE *)context -> gx_draw_context_memory; 141 draw_start += context -> gx_draw_context_pitch * rotated_top; 142 draw_start += rotated_left; 143 144 for (row = 0; row < y_height; row++) 145 { 146 glyph_data = glyph_row; 147 148 put = draw_start; 149 150 if (leading_pixel) 151 { 152 alpha = (*glyph_data) & 0x0f; 153 154 /* use 3bit color gradient instead of 4 bit */ 155 alpha >>= 1; 156 157 *put = (GX_UBYTE)(text_color - alpha); 158 put++; 159 160 glyph_data++; 161 } 162 for (index = 0; index < pixel_width; index++) 163 { 164 alpha = (*glyph_data) & 0xf0; 165 166 /* use 3bit color gradient instead of 4 bit */ 167 alpha >>= 1; 168 169 *put = (GX_UBYTE)(text_color - (alpha >> 4)); 170 put++; 171 172 alpha = (*glyph_data) & 0x0f; 173 174 /* use 3bit color gradient instead of 4 bit */ 175 alpha >>= 1; 176 177 *put = (GX_UBYTE)(text_color - alpha); 178 put++; 179 glyph_data++; 180 } 181 182 if (trailing_pixel) 183 { 184 alpha = (*glyph_data) & 0xf0; 185 186 /* use 3bit color gradient instead of 4 bit */ 187 alpha >>= 1; 188 189 *put = (GX_UBYTE)(text_color - (alpha >> 4)); 190 put++; 191 } 192 193 glyph_row += pitch; 194 draw_start += context -> gx_draw_context_pitch; 195 } 196 } 197 198
