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_display.h" 28 #include "gx_utility.h" 29 30 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _gx_display_driver_8bpp_rotated_canvas_copy PORTABLE C */ 37 /* 6.1.4 */ 38 /* AUTHOR */ 39 /* */ 40 /* Kenneth Maxwell, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* Generic 8bpp rotated canvas copy function. */ 45 /* */ 46 /* INPUT */ 47 /* */ 48 /* canvas The canvas to copy from */ 49 /* composite The canvas to copy to */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* None */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* _gx_utility_rectangle_shift Move the rectangle */ 58 /* _gx_utility_rectangle_overlap_detect Detect two rectangles being */ 59 /* overlap to each other */ 60 /* memcpy Move canvas data */ 61 /* */ 62 /* CALLED BY */ 63 /* */ 64 /* GUIX Internal Code */ 65 /* */ 66 /* RELEASE HISTORY */ 67 /* */ 68 /* DATE NAME DESCRIPTION */ 69 /* */ 70 /* 02-02-2021 Kenneth Maxwell Initial Version 6.1.4 */ 71 /* */ 72 /**************************************************************************/ _gx_display_driver_8bpp_rotated_canvas_copy(GX_CANVAS * canvas,GX_CANVAS * composite)73VOID _gx_display_driver_8bpp_rotated_canvas_copy(GX_CANVAS *canvas, GX_CANVAS *composite) 74 { 75 GX_RECTANGLE dirty; 76 GX_RECTANGLE overlap; 77 GX_UBYTE *read; 78 GX_UBYTE *write; 79 INT width; 80 INT row; 81 82 dirty.gx_rectangle_left = dirty.gx_rectangle_top = 0; 83 dirty.gx_rectangle_right = (GX_VALUE)(canvas -> gx_canvas_x_resolution - 1); 84 dirty.gx_rectangle_bottom = (GX_VALUE)(canvas -> gx_canvas_y_resolution - 1); 85 86 _gx_utility_rectangle_shift(&dirty, canvas -> gx_canvas_display_offset_x, canvas -> gx_canvas_display_offset_y); 87 88 if (_gx_utility_rectangle_overlap_detect(&dirty, &composite -> gx_canvas_dirty_area, &overlap)) 89 { 90 width = overlap.gx_rectangle_bottom - overlap.gx_rectangle_top + 1; 91 92 read = (GX_UBYTE *)canvas -> gx_canvas_memory; 93 write = (GX_UBYTE *)composite -> gx_canvas_memory; 94 95 if (canvas -> gx_canvas_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW) 96 { 97 /* Index into starting row. */ 98 read += (dirty.gx_rectangle_right - overlap.gx_rectangle_right) * canvas -> gx_canvas_y_resolution; 99 100 /* Index into pixel. */ 101 read += overlap.gx_rectangle_top - dirty.gx_rectangle_top; 102 103 /* Calculate the write pointer. */ 104 write += (composite -> gx_canvas_x_resolution - overlap.gx_rectangle_right - 1) * composite -> gx_canvas_y_resolution; 105 write += overlap.gx_rectangle_top; 106 } 107 else 108 { 109 /* Index into starting row. */ 110 read += (overlap.gx_rectangle_left - dirty.gx_rectangle_left) * canvas -> gx_canvas_y_resolution; 111 112 /* Index into pixel. */ 113 read += dirty.gx_rectangle_bottom - overlap.gx_rectangle_bottom; 114 115 /* Calculate the write pointer. */ 116 write += overlap.gx_rectangle_left * composite -> gx_canvas_y_resolution; 117 write += (composite -> gx_canvas_y_resolution - overlap.gx_rectangle_bottom - 1); 118 } 119 120 for (row = overlap.gx_rectangle_left; row <= overlap.gx_rectangle_right; row++) 121 { 122 memcpy(write, read, (size_t)width); /* Use case of memcpy is verified. */ 123 124 write += composite -> gx_canvas_y_resolution; 125 read += canvas -> gx_canvas_y_resolution; 126 } 127 } 128 } 129 130
