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ruanhaishen
redis
Commits
e30ba94f
Commit
e30ba94f
authored
Sep 11, 2018
by
antirez
Browse files
LOLWUT: canvas structure and BSD license on top.
parent
9c771145
Changes
1
Show whitespace changes
Inline
Side-by-side
src/lolwut.c
View file @
e30ba94f
/*
* Copyright (c) 2017, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Redis 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.
*
* ----------------------------------------------------------------------------
*
* This file implements the LOLWUT command. The command should do something
* fun and interesting, and should be replaced by a new implementation at
* each new version of Redis.
*/
/* This function represents our canvas. Drawing functions will take a pointer
* to a canvas to write to it. Later the canvas can be rendered to a string
* suitable to be printed on the screen, using unicode Braille characters. */
struct
lwCanvas
{
int
width
;
int
height
;
char
*
pixels
;
};
/* Translate a group of 8 pixels (2x8 vertical rectangle) to the corresponding
/* Translate a group of 8 pixels (2x8 vertical rectangle) to the corresponding
* braille character. The byte should correspond to the pixels arranged as
* braille character. The byte should correspond to the pixels arranged as
* follows, where 0 is the least significant bit, and 7 the most significant
* follows, where 0 is the least significant bit, and 7 the most significant
...
@@ -21,3 +65,5 @@ void lwEmitPixelsGroup(int byte, char *output) {
...
@@ -21,3 +65,5 @@ void lwEmitPixelsGroup(int byte, char *output) {
output
[
2
]
=
0x80
|
((
code
>>
6
)
&
0x3F
);
/* 10-xxxxxx */
output
[
2
]
=
0x80
|
((
code
>>
6
)
&
0x3F
);
/* 10-xxxxxx */
output
[
3
]
=
0x80
|
(
code
&
0x3F
);
/* 10-xxxxxx */
output
[
3
]
=
0x80
|
(
code
&
0x3F
);
/* 10-xxxxxx */
}
}
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