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Switch to deltaE method for color posterization

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This commit is contained in:
Keith Winstein
2012-03-18 01:52:13 -04:00
parent 1396b1e3e3
commit 13bd38aa51
1 changed files with 19 additions and 19 deletions
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src/terminal/terminalframebuffer.cc
+19 -19
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@@ -484,9 +484,6 @@ std::string Renditions::sgr( void ) const
color. See
https://lists.ubuntu.com/archives/ubuntu-devel/2011-March/032726.html
For purposes of this routine, we just treat the eight colors as
taking each possible assignment of 0 or 255 to their components.
Terminal emulators that advertise "xterm" are inconsistent on the
handling of initc to change the contents of a cell in the color
pallette. On RIS (reset to initial state) or choosing reset from
@@ -498,23 +495,26 @@ std::string Renditions::sgr( void ) const
mosh ignores initc for now, despite advertising xterm-256color. */
/* Table mapping common color cube for [16 .. 255]
to xterm's system colors (0 .. 7) with closest
CIE deltaE(2000). */
static const char standard_posterization[] = {
0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7,
0, 0, 4, 4, 4, 4, 0, 0, 4, 4, 4, 4, 2, 2, 6, 6,
6, 6, 2, 2, 6, 6, 6, 6, 2, 2, 6, 6, 6, 6, 2, 2,
6, 6, 6, 6, 0, 0, 4, 4, 4, 4, 0, 0, 4, 4, 4, 4,
2, 2, 6, 6, 6, 6, 2, 2, 6, 6, 6, 6, 2, 2, 6, 6,
6, 6, 2, 2, 6, 6, 6, 6, 1, 1, 5, 5, 5, 5, 1, 1,
5, 5, 5, 5, 3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7,
3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7, 1, 1, 5, 5,
5, 5, 1, 1, 5, 5, 5, 5, 3, 3, 7, 7, 7, 7, 3, 3,
7, 7, 7, 7, 3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7,
1, 1, 5, 5, 5, 5, 1, 1, 5, 5, 5, 5, 3, 3, 7, 7,
7, 7, 3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7, 3, 3,
7, 7, 7, 7, 1, 1, 5, 5, 5, 5, 1, 1, 5, 5, 5, 5,
3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7, 3, 3, 7, 7,
7, 7, 3, 3, 7, 7, 7, 7, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 };
0, 1, 2, 3, 4, 5, 6, 7, 7, 1, 2, 3, 4, 5, 6, 7,
0, 4, 4, 4, 4, 4, 0, 0, 4, 4, 4, 4, 2, 6, 6, 6,
6, 4, 2, 2, 6, 6, 6, 6, 2, 2, 2, 6, 6, 6, 2, 2,
2, 2, 6, 6, 1, 4, 4, 4, 4, 4, 0, 0, 4, 4, 4, 4,
2, 2, 6, 6, 4, 5, 2, 2, 6, 6, 6, 6, 2, 2, 2, 6,
6, 6, 2, 2, 2, 2, 6, 6, 1, 5, 5, 4, 4, 4, 1, 1,
5, 5, 5, 5, 3, 3, 7, 5, 5, 5, 2, 2, 2, 6, 7, 7,
2, 2, 2, 6, 6, 6, 2, 2, 2, 2, 6, 6, 1, 5, 5, 5,
5, 5, 1, 1, 5, 5, 5, 5, 3, 1, 7, 5, 5, 5, 3, 3,
3, 7, 7, 7, 3, 3, 2, 7, 6, 7, 3, 2, 2, 2, 6, 6,
1, 5, 5, 5, 5, 5, 1, 1, 5, 5, 5, 5, 3, 1, 1, 5,
5, 5, 3, 3, 7, 7, 7, 7, 3, 3, 3, 7, 7, 7, 3, 3,
3, 3, 7, 7, 1, 1, 5, 5, 5, 5, 1, 1, 5, 5, 5, 5,
1, 1, 1, 5, 5, 5, 3, 7, 7, 7, 7, 7, 3, 3, 3, 7,
7, 7, 3, 3, 3, 3, 7, 7, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1, 1, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 };
void Renditions::posterize( void )
{