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 /* Include necessary system files. */
24
25 #include "gx_api.h"
26 #include "gx_display.h"
27 #include "gx_utility.h"
28
29 #define ALPHAVAL(_c) (GX_UBYTE)(((_c) >> 12) & 0xf)
30 #define REDVAL(_c) (GX_UBYTE)(((_c) >> 8) & 0xf)
31 #define GREENVAL(_c) (GX_UBYTE)(((_c) >> 4) & 0xf)
32 #define BLUEVAL(_c) (GX_UBYTE)((_c) & 0xf)
33
34 #define ASSEMBLECOLOR(_a, _r, _g, _b) \
35 ((((_a) & 0xf) << 12) | \
36 (((_r) & 0xf) << 8) | \
37 (((_g) & 0xf) << 4) | \
38 ((_b) & 0xf))
39
40
41 /**************************************************************************/
42 /* */
43 /* FUNCTION RELEASE */
44 /* */
45 /* _gx_display_driver_4444argb_canvas_blend PORTABLE C */
46 /* 6.1 */
47 /* AUTHOR */
48 /* */
49 /* Kenneth Maxwell, Microsoft Corporation */
50 /* */
51 /* DESCRIPTION */
52 /* */
53 /* Canvas blend function for 4444argb color foramt. */
54 /* */
55 /* INPUT */
56 /* */
57 /* canvas The canvas to blend to */
58 /* composite The canvas to blend from */
59 /* */
60 /* OUTPUT */
61 /* */
62 /* None */
63 /* */
64 /* CALLS */
65 /* */
66 /* _gx_utility_rectangle_shift Adjust the rectangle */
67 /* _gx_utility_recttangle_overlap_detect Detect whether two areas */
68 /* overlap */
69 /* REDVAL Extrace Red from canvas */
70 /* GREENVAL Extrace Green from canvas */
71 /* BLUEVAL Extrace Blue from canvas */
72 /* ASSEMBLECOLOR Compose the RGB color */
73 /* */
74 /* CALLED BY */
75 /* */
76 /* GUIX Internal Code */
77 /* */
78 /* RELEASE HISTORY */
79 /* */
80 /* DATE NAME DESCRIPTION */
81 /* */
82 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
83 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
84 /* resulting in version 6.1 */
85 /* */
86 /**************************************************************************/
_gx_display_driver_4444argb_canvas_blend(GX_CANVAS * canvas,GX_CANVAS * composite)87 VOID _gx_display_driver_4444argb_canvas_blend(GX_CANVAS *canvas, GX_CANVAS *composite)
88 {
89 GX_RECTANGLE dirty;
90 GX_RECTANGLE overlap;
91 USHORT *read;
92 USHORT *read_start;
93 USHORT *write;
94 USHORT *write_start;
95 USHORT fcolor;
96 GX_UBYTE falpha;
97 GX_UBYTE fred;
98 GX_UBYTE fgreen;
99 GX_UBYTE fblue;
100 GX_UBYTE balpha;
101 GX_UBYTE bred;
102 GX_UBYTE bgreen;
103 GX_UBYTE bblue;
104 GX_UBYTE inv_alpha;
105 GX_UBYTE combined_alpha;
106 USHORT bcolor;
107 INT row;
108 INT col;
109
110 dirty.gx_rectangle_left = dirty.gx_rectangle_top = 0;
111 dirty.gx_rectangle_right = (GX_VALUE)(canvas -> gx_canvas_x_resolution - 1);
112 dirty.gx_rectangle_bottom = (GX_VALUE)(canvas -> gx_canvas_y_resolution - 1);
113
114 _gx_utility_rectangle_shift(&dirty, canvas -> gx_canvas_display_offset_x, canvas -> gx_canvas_display_offset_y);
115
116 if (_gx_utility_rectangle_overlap_detect(&dirty, &composite -> gx_canvas_dirty_area, &overlap))
117 {
118
119 read_start = (USHORT *)canvas -> gx_canvas_memory;
120
121 /* index into starting row */
122 read_start += (overlap.gx_rectangle_top - dirty.gx_rectangle_top) * canvas -> gx_canvas_x_resolution;
123
124 /* index into pixel */
125
126 read_start += overlap.gx_rectangle_left - dirty.gx_rectangle_left;
127
128 /* calculate the write pointer */
129 write_start = (USHORT *)composite -> gx_canvas_memory;
130 write_start += overlap.gx_rectangle_top * composite -> gx_canvas_x_resolution;
131 write_start += overlap.gx_rectangle_left;
132
133 for (row = overlap.gx_rectangle_top; row <= overlap.gx_rectangle_bottom; row++)
134 {
135 read = read_start;
136 write = write_start;
137
138 for (col = overlap.gx_rectangle_left; col <= overlap.gx_rectangle_right; col++)
139 {
140 /* read the foreground color */
141 fcolor = *read++;
142
143 /* split foreground into red, green, and blue components */
144 falpha = ALPHAVAL(fcolor);
145 falpha = (GX_UBYTE)(falpha | (falpha << 4));
146 fred = REDVAL(fcolor);
147 fgreen = GREENVAL(fcolor);
148 fblue = BLUEVAL(fcolor);
149
150 combined_alpha = (GX_UBYTE)((falpha * canvas -> gx_canvas_alpha) >> 8);
151
152 /* read background color */
153 bcolor = *write;
154
155 /* split background color into alpha, red, green, and blue components */
156 balpha = ALPHAVAL(bcolor);
157 balpha = (GX_UBYTE)(balpha | (balpha << 4));
158 bred = REDVAL(bcolor);
159 bgreen = GREENVAL(bcolor);
160 bblue = BLUEVAL(bcolor);
161
162 /* background alpha is inverse of foreground alpha */
163 inv_alpha = (GX_UBYTE)(256 - combined_alpha);
164
165 /* blend foreground and background, each color channel */
166 falpha = (GX_UBYTE)(((balpha * inv_alpha) + (falpha * combined_alpha)) >> 8);
167 fred = (GX_UBYTE)(((bred * inv_alpha) + (fred * combined_alpha)) >> 8);
168 fgreen = (GX_UBYTE)(((bgreen * inv_alpha) + (fgreen * combined_alpha)) >> 8);
169 fblue = (GX_UBYTE)(((bblue * inv_alpha) + (fblue * combined_alpha)) >> 8);
170
171 /* re-assemble into 16-bit color and write it out */
172 *write++ = (USHORT)ASSEMBLECOLOR(falpha, fred, fgreen, fblue);
173 }
174 write_start += composite -> gx_canvas_x_resolution;
175 read_start += canvas -> gx_canvas_x_resolution;
176 }
177 }
178 }
179
180
