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_32bpp_rotated_canvas_copy        PORTABLE C      */
37 /*                                                           6.1.4        */
38 /*  AUTHOR                                                                */
39 /*                                                                        */
40 /*    Kenneth Maxwell, Microsoft Corporation                              */
41 /*                                                                        */
42 /*  DESCRIPTION                                                           */
43 /*                                                                        */
44 /*    Generic rotated 32bpp 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_32bpp_rotated_canvas_copy(GX_CANVAS * canvas,GX_CANVAS * composite)73 VOID _gx_display_driver_32bpp_rotated_canvas_copy(GX_CANVAS *canvas, GX_CANVAS *composite)
74 {
75 GX_RECTANGLE dirty;
76 GX_RECTANGLE overlap;
77 ULONG       *read;
78 ULONG       *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         read = (ULONG *)canvas -> gx_canvas_memory;
92         write = (ULONG *)composite -> gx_canvas_memory;
93 
94         if (canvas -> gx_canvas_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
95         {
96             /* Index into starting row.  */
97             read += (dirty.gx_rectangle_right - overlap.gx_rectangle_right) * canvas -> gx_canvas_y_resolution;
98 
99             /* Index into pixel.  */
100             read += overlap.gx_rectangle_top - dirty.gx_rectangle_top;
101 
102             /* Calculate the write pointer.  */
103             write += (composite -> gx_canvas_x_resolution - overlap.gx_rectangle_right - 1) * composite -> gx_canvas_y_resolution;
104             write += overlap.gx_rectangle_top;
105         }
106         else
107         {
108             /* Index into starting row.  */
109             read += (overlap.gx_rectangle_left - dirty.gx_rectangle_left) * canvas -> gx_canvas_y_resolution;
110 
111             /* Index into pixel.  */
112             read += dirty.gx_rectangle_bottom - overlap.gx_rectangle_bottom;
113 
114             /* Calculate the write pointer.  */
115             write += overlap.gx_rectangle_left * composite -> gx_canvas_y_resolution;
116             write += (composite -> gx_canvas_y_resolution - overlap.gx_rectangle_bottom - 1);
117         }
118 
119         for (row = overlap.gx_rectangle_left; row <= overlap.gx_rectangle_right; row++)
120         {
121             memcpy(write, read, (size_t)width * 4); /* Use case of memcpy is verified. */
122 
123             write += composite -> gx_canvas_y_resolution;
124             read += canvas -> gx_canvas_y_resolution;
125         }
126     }
127 }
128 
129