197 lines
7.2 KiB
Diff
197 lines
7.2 KiB
Diff
From 56dec05d29098b151421625c68525c2c3961e574 Mon Sep 17 00:00:00 2001
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From: David Herrmann <dh.herrmann@gmail.com>
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Date: Fri, 3 Oct 2014 14:44:41 +0200
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Subject: [PATCH] terminal/screen: add color converter
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Terminals use pseudo color-codes mixed with 8bit and 24bit colors. Provide
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a color-converter so external renderers only have to deal with ARGB32
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colors.
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This requires a color-palette as input as there's no fixed mapping. We
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provide a default, but maybe we wanna support external palettes in the
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future.
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---
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src/libsystemd-terminal/term-parser.c | 116 ++++++++++++++++++++++++++++++++++
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src/libsystemd-terminal/term-screen.c | 26 +-------
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src/libsystemd-terminal/term.h | 2 +
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3 files changed, 120 insertions(+), 24 deletions(-)
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diff --git a/src/libsystemd-terminal/term-parser.c b/src/libsystemd-terminal/term-parser.c
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index f9326d563a..8ec6345d60 100644
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--- a/src/libsystemd-terminal/term-parser.c
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+++ b/src/libsystemd-terminal/term-parser.c
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@@ -35,6 +35,122 @@
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#include "term-internal.h"
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#include "util.h"
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+static const uint8_t default_palette[18][3] = {
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+ { 0, 0, 0 }, /* black */
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+ { 205, 0, 0 }, /* red */
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+ { 0, 205, 0 }, /* green */
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+ { 205, 205, 0 }, /* yellow */
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+ { 0, 0, 238 }, /* blue */
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+ { 205, 0, 205 }, /* magenta */
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+ { 0, 205, 205 }, /* cyan */
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+ { 229, 229, 229 }, /* light grey */
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+ { 127, 127, 127 }, /* dark grey */
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+ { 255, 0, 0 }, /* light red */
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+ { 0, 255, 0 }, /* light green */
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+ { 255, 255, 0 }, /* light yellow */
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+ { 92, 92, 255 }, /* light blue */
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+ { 255, 0, 255 }, /* light magenta */
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+ { 0, 255, 255 }, /* light cyan */
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+ { 255, 255, 255 }, /* white */
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+
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+ { 229, 229, 229 }, /* light grey */
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+ { 0, 0, 0 }, /* black */
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+};
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+
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+static uint32_t term_color_to_argb32(const term_color *color, const term_attr *attr, const uint8_t *palette) {
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+ static const uint8_t bval[] = {
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+ 0x00, 0x5f, 0x87,
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+ 0xaf, 0xd7, 0xff,
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+ };
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+ uint8_t r, g, b, t;
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+
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+ assert(color);
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+
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+ if (!palette)
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+ palette = (void*)default_palette;
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+
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+ switch (color->ccode) {
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+ case TERM_CCODE_RGB:
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+ r = color->red;
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+ g = color->green;
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+ b = color->blue;
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+
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+ break;
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+ case TERM_CCODE_256:
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+ t = color->c256;
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+ if (t < 16) {
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+ r = palette[t * 3 + 0];
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+ g = palette[t * 3 + 1];
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+ b = palette[t * 3 + 2];
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+ } else if (t < 232) {
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+ t -= 16;
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+ b = bval[t % 6];
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+ t /= 6;
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+ g = bval[t % 6];
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+ t /= 6;
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+ r = bval[t % 6];
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+ } else {
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+ t = (t - 232) * 10 + 8;
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+ r = t;
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+ g = t;
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+ b = t;
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+ }
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+
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+ break;
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+ case TERM_CCODE_BLACK ... TERM_CCODE_LIGHT_WHITE:
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+ t = color->ccode - TERM_CCODE_BLACK;
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+
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+ /* bold causes light colors */
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+ if (t < 8 && attr->bold)
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+ t += 8;
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+
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+ r = palette[t * 3 + 0];
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+ g = palette[t * 3 + 1];
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+ b = palette[t * 3 + 2];
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+ break;
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+ case TERM_CCODE_DEFAULT:
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+ /* fallthrough */
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+ default:
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+ t = 16 + !(color == &attr->fg);
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+ r = palette[t * 3 + 0];
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+ g = palette[t * 3 + 1];
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+ b = palette[t * 3 + 2];
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+ break;
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+ }
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+
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+ return (0xff << 24) | (r << 16) | (g << 8) | b;
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+}
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+
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+/**
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+ * term_attr_to_argb32() - Encode terminal colors as native ARGB32 value
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+ * @color: Terminal attributes to work on
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+ * @fg: Storage for foreground color (or NULL)
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+ * @bg: Storage for background color (or NULL)
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+ * @palette: The color palette to use (or NULL for default)
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+ *
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+ * This encodes the colors attr->fg and attr->bg as native-endian ARGB32 values
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+ * and returns them. Any color conversions are automatically applied.
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+ */
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+void term_attr_to_argb32(const term_attr *attr, uint32_t *fg, uint32_t *bg, const uint8_t *palette) {
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+ uint32_t f, b, t;
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+
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+ assert(attr);
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+
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+ f = term_color_to_argb32(&attr->fg, attr, palette);
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+ b = term_color_to_argb32(&attr->bg, attr, palette);
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+
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+ if (attr->inverse) {
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+ t = f;
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+ f = b;
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+ b = t;
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+ }
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+
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+ if (fg)
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+ *fg = f;
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+ if (bg)
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+ *bg = b;
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+}
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+
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/**
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* term_utf8_encode() - Encode single UCS-4 character as UTF-8
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* @out_utf8: output buffer of at least 4 bytes or NULL
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diff --git a/src/libsystemd-terminal/term-screen.c b/src/libsystemd-terminal/term-screen.c
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index ccfb9a450c..3f7ef1cf3c 100644
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--- a/src/libsystemd-terminal/term-screen.c
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+++ b/src/libsystemd-terminal/term-screen.c
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@@ -2944,31 +2944,9 @@ static int screen_SGR(term_screen *screen, const term_seq *seq) {
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if (i >= seq->n_args || seq->args[i] < 0)
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break;
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+ dst->ccode = TERM_CCODE_256;
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code = seq->args[i];
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- if (code < 16) {
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- dst->ccode = code;
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- } else if (code < 232) {
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- static const uint8_t bval[] = {
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- 0x00, 0x5f, 0x87,
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- 0xaf, 0xd7, 0xff,
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- };
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-
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- dst->ccode = TERM_CCODE_256;
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- dst->c256 = code;
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- code -= 16;
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- dst->blue = bval[code % 6];
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- code /= 6;
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- dst->green = bval[code % 6];
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- code /= 6;
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- dst->red = bval[code % 6];
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- } else if (code < 256) {
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- dst->ccode = TERM_CCODE_256;
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- dst->c256 = code;
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- code = (code - 232) * 10 + 8;
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- dst->red = code;
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- dst->green = code;
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- dst->blue = code;
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- }
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+ dst->c256 = code < 256 ? code : 0;
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break;
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}
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diff --git a/src/libsystemd-terminal/term.h b/src/libsystemd-terminal/term.h
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index 5228ce0601..8efd48b263 100644
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--- a/src/libsystemd-terminal/term.h
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+++ b/src/libsystemd-terminal/term.h
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@@ -97,6 +97,8 @@ struct term_attr {
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unsigned int hidden : 1; /* hidden */
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};
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+void term_attr_to_argb32(const term_attr *attr, uint32_t *fg, uint32_t *bg, const uint8_t *palette);
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+
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/*
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* UTF-8
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*/
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