1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/****************************************************************************
* nuttx/graphics/nxterm/nxterm_scroll.c
*
* Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <semaphore.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/nx/nx.h>
#include <nuttx/nx/nxfonts.h>
#include "nxterm.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxterm_movedisplay
*
* Description:
* This function implements the data movement for the scroll operation. If
* we can read the displays framebuffer memory, then the job is pretty
* easy. However, many displays (such as SPI-based LCDs) are often read-
* only.
****************************************************************************/
#ifdef CONFIG_NX_WRITEONLY
static inline void nxterm_movedisplay(FAR struct nxterm_state_s *priv,
int bottom, int scrollheight)
{
FAR struct nxterm_bitmap_s *bm;
struct nxgl_rect_s rect;
nxgl_coord_t row;
int ret;
int i;
/* Move each row, one at a time. They could all be moved at once (by calling
* nxterm_redraw), but the since the region is cleared, then re-written, the
* effect would not be good. Below the region is also cleared and re-written,
* however, in much smaller chunks.
*/
rect.pt1.x = 0;
rect.pt2.x = priv->wndo.wsize.w - 1;
for (row = CONFIG_NXTERM_LINESEPARATION; row < bottom; row += scrollheight)
{
/* Create a bounding box the size of one row of characters */
rect.pt1.y = row;
rect.pt2.y = row + scrollheight - 1;
/* Clear the region */
ret = priv->ops->fill(priv, &rect, priv->wndo.wcolor);
if (ret < 0)
{
gdbg("Fill failed: %d\n", errno);
}
/* Fill each character that might lie within in the bounding box */
for (i = 0; i < priv->nchars; i++)
{
bm = &priv->bm[i];
if (bm->pos.y <= rect.pt2.y && bm->pos.y + priv->fheight >= rect.pt1.y)
{
nxterm_fillchar(priv, &rect, bm);
}
}
}
/* Finally, clear the vacated part of the display */
rect.pt1.y = bottom;
rect.pt2.y = priv->wndo.wsize.h- 1;
ret = priv->ops->fill(priv, &rect, priv->wndo.wcolor);
if (ret < 0)
{
gdbg("Fill failed: %d\n", errno);
}
}
#else
static inline void nxterm_movedisplay(FAR struct nxterm_state_s *priv,
int bottom, int scrollheight)
{
struct nxgl_rect_s rect;
struct nxgl_point_s offset;
int ret;
/* Add the line separation value to the scroll height */
scrollheight += CONFIG_NXTERM_LINESEPARATION;
/* Move the display in the range of 0-height up one scrollheight. The
* line at the bottom will be reset to the background color automatically.
*
* The source rectangle to be moved.
*/
rect.pt1.x = 0;
rect.pt1.y = scrollheight;
rect.pt2.x = priv->wndo.wsize.w - 1;
rect.pt2.y = priv->wndo.wsize.h - 1;
/* The offset that determines how far to move the source rectangle */
offset.x = 0;
offset.y = -scrollheight;
/* Move the source rectangle upward by the scrollheight */
ret = priv->ops->move(priv, &rect, &offset);
if (ret < 0)
{
gdbg("Move failed: %d\n", errno);
}
/* Finally, clear the vacated bottom part of the display */
rect.pt1.y = priv->wndo.wsize.h - scrollheight;
ret = priv->ops->fill(priv, &rect, priv->wndo.wcolor);
if (ret < 0)
{
gdbg("Fill failed: %d\n", errno);
}
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxterm_scroll
****************************************************************************/
void nxterm_scroll(FAR struct nxterm_state_s *priv, int scrollheight)
{
int i;
int j;
/* Adjust the vertical position of each character */
for (i = 0; i < priv->nchars; )
{
FAR struct nxterm_bitmap_s *bm = &priv->bm[i];
/* Has any part of this character scrolled off the screen? */
if (bm->pos.y < scrollheight + CONFIG_NXTERM_LINESEPARATION)
{
/* Yes... Delete the character by moving all of the data */
for (j = i; j < priv->nchars-1; j++)
{
memcpy(&priv->bm[j], &priv->bm[j+1], sizeof(struct nxterm_bitmap_s));
}
/* Decrement the number of cached characters ('i' is not incremented
* in this case because it already points to the next character)
*/
priv->nchars--;
}
/* No.. just decrement its vertical position (moving it "up" the
* display by one line).
*/
else
{
bm->pos.y -= scrollheight;
/* We are keeping this one so increment to the next character */
i++;
}
}
/* And move the next display position up by one line as well */
priv->fpos.y -= scrollheight;
/* Move the display in the range of 0-height up one scrollheight. */
nxterm_movedisplay(priv, priv->fpos.y, scrollheight);
}
|
