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_canvas_copy PORTABLE C */
37 /* 6.1 */
38 /* AUTHOR */
39 /* */
40 /* Kenneth Maxwell, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* Generic 8bpp 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 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
71 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
72 /* resulting in version 6.1 */
73 /* */
74 /**************************************************************************/
_gx_display_driver_8bpp_canvas_copy(GX_CANVAS * canvas,GX_CANVAS * composite)75 VOID _gx_display_driver_8bpp_canvas_copy(GX_CANVAS *canvas, GX_CANVAS *composite)
76 {
77 GX_RECTANGLE dirty;
78 GX_RECTANGLE overlap;
79 GX_UBYTE *read;
80 GX_UBYTE *write;
81 INT width;
82 INT row;
83
84 dirty.gx_rectangle_left = dirty.gx_rectangle_top = 0;
85 dirty.gx_rectangle_right = (GX_VALUE)(canvas -> gx_canvas_x_resolution - 1);
86 dirty.gx_rectangle_bottom = (GX_VALUE)(canvas -> gx_canvas_y_resolution - 1);
87
88 _gx_utility_rectangle_shift(&dirty, canvas -> gx_canvas_display_offset_x, canvas -> gx_canvas_display_offset_y);
89
90 if (_gx_utility_rectangle_overlap_detect(&dirty, &composite -> gx_canvas_dirty_area, &overlap))
91 {
92 width = overlap.gx_rectangle_right - overlap.gx_rectangle_left + 1;
93 read = (GX_UBYTE *)canvas -> gx_canvas_memory;
94
95 /* index into starting row */
96 read += (overlap.gx_rectangle_top - dirty.gx_rectangle_top) * canvas -> gx_canvas_x_resolution;
97
98 /* index into pixel */
99
100 read += overlap.gx_rectangle_left - dirty.gx_rectangle_left;
101
102 /* calculate the write pointer */
103 write = (GX_UBYTE *)composite -> gx_canvas_memory;
104 write += overlap.gx_rectangle_top * composite -> gx_canvas_x_resolution;
105 write += overlap.gx_rectangle_left;
106
107 for (row = overlap.gx_rectangle_top; row <= overlap.gx_rectangle_bottom; row++)
108 {
109 memcpy(write, read, (size_t)width); /* Use case of memcpy is verified. */
110
111 write += composite -> gx_canvas_x_resolution;
112 read += canvas -> gx_canvas_x_resolution;
113 }
114 }
115 }
116
117
