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 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_display.h"
28 #include "gx_utility.h"
29
30 /**************************************************************************/
31 /* */
32 /* FUNCTION RELEASE */
33 /* */
34 /* _gx_display_driver_24xrgb_rotated_canvas_blend PORTABLE C */
35 /* 6.1.4 */
36 /* AUTHOR */
37 /* */
38 /* Kenneth Maxwell, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* Rotated canvas blend function for 24xrgb color format. */
43 /* */
44 /* INPUT */
45 /* */
46 /* canvas The canvas to blend to */
47 /* composite The canvas to blend from */
48 /* */
49 /* OUTPUT */
50 /* */
51 /* None */
52 /* */
53 /* CALLS */
54 /* */
55 /* _gx_utility_rectangle_shift Adjust the rectangle */
56 /* _gx_utility_recttangle_overlap_detect Detect whether two areas */
57 /* overlap */
58 /* REDVAL_24BPP Extrace Red from canvas */
59 /* GREENVAL_24BPP Extrace Green from canvas */
60 /* BLUEVAL_24BPP Extrace Blue from canvas */
61 /* ASSEMBLECOLOR_24BPP Compose the RGB color */
62 /* */
63 /* CALLED BY */
64 /* */
65 /* GUIX Internal Code */
66 /* */
67 /* RELEASE HISTORY */
68 /* */
69 /* DATE NAME DESCRIPTION */
70 /* */
71 /* 02-02-2021 Kenneth Maxwell Initial Version 6.1.4 */
72 /* */
73 /**************************************************************************/
_gx_display_driver_24xrgb_rotated_canvas_blend(GX_CANVAS * canvas,GX_CANVAS * composite)74 VOID _gx_display_driver_24xrgb_rotated_canvas_blend(GX_CANVAS *canvas, GX_CANVAS *composite)
75 {
76 GX_RECTANGLE dirty;
77 GX_RECTANGLE overlap;
78 ULONG *read;
79 ULONG *read_start;
80 ULONG *write;
81 ULONG *write_start;
82 ULONG fcolor;
83 GX_UBYTE fred, fgreen, fblue;
84 GX_UBYTE bred, bgreen, bblue;
85 GX_UBYTE alpha, balpha;
86
87 ULONG bcolor;
88 INT row;
89 INT col;
90
91 dirty.gx_rectangle_left = dirty.gx_rectangle_top = 0;
92 dirty.gx_rectangle_right = (GX_VALUE)(canvas -> gx_canvas_x_resolution - 1);
93 dirty.gx_rectangle_bottom = (GX_VALUE)(canvas -> gx_canvas_y_resolution - 1);
94
95 _gx_utility_rectangle_shift(&dirty, canvas -> gx_canvas_display_offset_x, canvas -> gx_canvas_display_offset_y);
96
97 if (_gx_utility_rectangle_overlap_detect(&dirty, &composite -> gx_canvas_dirty_area, &overlap))
98 {
99 alpha = canvas -> gx_canvas_alpha;
100 balpha = (GX_UBYTE)(256 - alpha);
101
102 read_start = (ULONG *)canvas -> gx_canvas_memory;
103 write_start = (ULONG *)composite -> gx_canvas_memory;
104
105 if (canvas -> gx_canvas_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
106 {
107 /* Index into starting row. */
108 read_start += (dirty.gx_rectangle_right - overlap.gx_rectangle_right) * canvas -> gx_canvas_y_resolution;
109
110 /* Index into pixel. */
111 read_start += overlap.gx_rectangle_top - dirty.gx_rectangle_top;
112
113 /* Calculate the write pointer. */
114 write_start += (composite -> gx_canvas_x_resolution - overlap.gx_rectangle_right - 1) * composite -> gx_canvas_y_resolution;
115 write_start += overlap.gx_rectangle_top;
116 }
117 else
118 {
119 /* Index into starting row. */
120 read_start += (overlap.gx_rectangle_left - dirty.gx_rectangle_left) * canvas -> gx_canvas_y_resolution;
121
122 /* Index into pixel. */
123 read_start += dirty.gx_rectangle_bottom - overlap.gx_rectangle_bottom;
124
125 /* Calculate the write pointer. */
126 write_start += overlap.gx_rectangle_left * composite -> gx_canvas_y_resolution;
127 write_start += (composite -> gx_canvas_y_resolution - overlap.gx_rectangle_bottom - 1);
128 }
129
130 for (row = overlap.gx_rectangle_left; row <= overlap.gx_rectangle_right; row++)
131 {
132 read = read_start;
133 write = write_start;
134
135 for (col = overlap.gx_rectangle_top; col <= overlap.gx_rectangle_bottom; col++)
136 {
137 /* Read the foreground color. */
138 fcolor = *read++;
139
140 /* Split foreground into red, green, and blue components. */
141 fred = REDVAL_24BPP(fcolor);
142 fgreen = GREENVAL_24BPP(fcolor);
143 fblue = BLUEVAL_24BPP(fcolor);
144
145 /* Read background color. */
146 bcolor = *write;
147
148 /* Split background color into red, green, and blue components. */
149 bred = REDVAL_24BPP(bcolor);
150 bgreen = GREENVAL_24BPP(bcolor);
151 bblue = BLUEVAL_24BPP(bcolor);
152
153 /* Blend foreground and background, each color channel. */
154 fred = (GX_UBYTE)(((bred * balpha) + (fred * alpha)) >> 8);
155 fgreen = (GX_UBYTE)(((bgreen * balpha) + (fgreen * alpha)) >> 8);
156 fblue = (GX_UBYTE)(((bblue * balpha) + (fblue * alpha)) >> 8);
157
158 /* Re-assemble into 16-bit color and write it out. */
159 *write++ = ASSEMBLECOLOR_32ARGB((ULONG)0xff, (ULONG)fred, (ULONG)fgreen, (ULONG)fblue);
160 }
161
162 write_start += composite -> gx_canvas_y_resolution;
163 read_start += canvas -> gx_canvas_y_resolution;
164 }
165 }
166 }
167
168
