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termptyesc: approximate true color. Ref T746

This commit is contained in:
Boris Faure 2018-03-11 19:51:11 +01:00
parent a5d8a89c32
commit 0eb223f1b8
1 changed files with 145 additions and 26 deletions
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171
src/bin/termptyesc.c
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@ -491,6 +491,95 @@ _handle_esc_csi_reset_mode(Termpty *ty, Eina_Unicode cc, Eina_Unicode *b)
}
}
static int
_csi_truecolor_arg_get(Eina_Unicode **ptr)
{
Eina_Unicode *b = *ptr;
int sum = 0;
if (!b)
goto error;
if ((*b == ';') || (*b == ':'))
{
b++;
*ptr = b;
return 0;
}
if (!*b)
goto error;
while ((*b >= '0') && (*b <= '9'))
{
if (sum > INT32_MAX/10 )
goto error;
sum *= 10;
sum += *b - '0';
b++;
}
if ((*b == ';') || (*b == ':'))
b++;
*ptr = b;
return sum;
error:
*ptr = NULL;
return -1;
}
static int
_handle_esc_csi_truecolor(Termpty *ty EINA_UNUSED, Eina_Unicode **ptr)
{
int r0, g0, b0;
int chosen_color = COL_DEF;
int c;
int distance_min = INT_MAX;
Evas_Object *textgrid;
r0 = _csi_truecolor_arg_get(ptr);
g0 = _csi_truecolor_arg_get(ptr);
b0 = _csi_truecolor_arg_get(ptr);
if ((r0 < 0) || (g0 < 0) || (b0 < 0))
return COL_DEF;
textgrid = termio_textgrid_get(ty->obj);
for (c = 0; c < 256; c++)
{
int r1 = 0, g1 = 0, b1 = 0, a1 = 0;
int delta_red_sq, delta_green_sq, delta_blue_sq, middle_red;
int distance;
evas_object_textgrid_palette_get(textgrid,
EVAS_TEXTGRID_PALETTE_EXTENDED,
c, &r1, &g1, &b1, &a1);
/* Compute the color distance
* XXX: this is inacurate but should give good enough results.
* See * https://en.wikipedia.org/wiki/Color_difference
*/
middle_red = (r0 + r1) / 2;
delta_red_sq = (r0 - r1) * (r0 - r1);
delta_green_sq = (g0 - g1) * (g0 - g1);
delta_blue_sq = (b0 - b1) * (b0 - b1);
distance = 2 * delta_red_sq
+ 4 * delta_green_sq
+ 3 * delta_blue_sq
+ ((middle_red) * (delta_red_sq - delta_blue_sq) / 256);
if (distance < distance_min)
{
distance_min = distance;
chosen_color = c;
}
}
return chosen_color;
}
static void
_handle_esc_csi_color_set(Termpty *ty, Eina_Unicode **ptr)
{
@ -586,21 +675,36 @@ _handle_esc_csi_color_set(Termpty *ty, Eina_Unicode **ptr)
ty->termstate.att.fgintense = 0;
break;
case 38: // xterm 256 fg color ???
// now check if next arg is 5
arg = _csi_arg_get(&b);
if (arg != 5) ERR("Failed xterm 256 color fg esc 5 (got %d)", arg);
else
switch (arg)
{
// then get next arg - should be color index 0-255
arg = _csi_arg_get(&b);
if (!b) ERR("Failed xterm 256 color fg esc val");
else if (arg < 0 || arg > 255)
ERR("Invalid fg color %d", arg);
else
{
ty->termstate.att.fg256 = 1;
ty->termstate.att.fg = arg;
}
case 2:
ty->termstate.att.fg256 = 1;
ty->termstate.att.fg =
_handle_esc_csi_truecolor(ty, &b);
DBG("truecolor fg: approximation got color %d",
ty->termstate.att.fg);
break;
case 3:
WRN("TODO: support colors in the Cyan-Magenta-Yellow colorspace");
break;
case 4:
WRN("TODO: support colors in the Cyan-Magenta-Yellow-Black colorspace");
break;
case 5:
// then get next arg - should be color index 0-255
arg = _csi_arg_get(&b);
if (!b) ERR("Failed xterm 256 color fg esc val");
else if (arg < 0 || arg > 255)
ERR("Invalid fg color %d", arg);
else
{
ty->termstate.att.fg256 = 1;
ty->termstate.att.fg = arg;
}
break;
default:
ERR("Failed xterm 256 color fg (got %d)", arg);
}
ty->termstate.att.fgintense = 0;
break;
@ -622,21 +726,36 @@ _handle_esc_csi_color_set(Termpty *ty, Eina_Unicode **ptr)
ty->termstate.att.bgintense = 0;
break;
case 48: // xterm 256 bg color ???
// now check if next arg is 5
arg = _csi_arg_get(&b);
if (arg != 5) ERR("Failed xterm 256 color bg esc 5 (got %d)", arg);
else
switch (arg)
{
// then get next arg - should be color index 0-255
arg = _csi_arg_get(&b);
if (!b) ERR("Failed xterm 256 color bg esc val");
else if (arg < 0 || arg > 255)
ERR("Invalid bg color %d", arg);
else
{
ty->termstate.att.bg256 = 1;
ty->termstate.att.bg = arg;
}
case 2:
ty->termstate.att.bg256 = 1;
ty->termstate.att.bg =
_handle_esc_csi_truecolor(ty, &b);
DBG("truecolor bg: approximation got color %d",
ty->termstate.att.bg);
break;
case 3:
WRN("TODO: support colors in the Cyan-Magenta-Yellow colorspace");
break;
case 4:
WRN("TODO: support colors in the Cyan-Magenta-Yellow-Black colorspace");
break;
case 5:
// then get next arg - should be color index 0-255
arg = _csi_arg_get(&b);
if (!b) ERR("Failed xterm 256 color bg esc val");
else if (arg < 0 || arg > 255)
ERR("Invalid bg color %d", arg);
else
{
ty->termstate.att.bg256 = 1;
ty->termstate.att.bg = arg;
}
break;
default:
ERR("Failed xterm 256 color bg (got %d)", arg);
}
ty->termstate.att.bgintense = 0;
break;