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authorDavid Herrmann <dh.herrmann@gmail.com>2014-10-03 14:44:41 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2014-10-03 15:57:00 +0200
commit56dec05d29098b151421625c68525c2c3961e574 (patch)
tree61dfb1b094344451c14b5e1adad9632c5631d8e8 /src/libsystemd-terminal/term-parser.c
parentcad8fe9a2b2ac340ef69233dd32e1bb1e45dae48 (diff)
terminal/screen: add color converter
Terminals use pseudo color-codes mixed with 8bit and 24bit colors. Provide a color-converter so external renderers only have to deal with ARGB32 colors. This requires a color-palette as input as there's no fixed mapping. We provide a default, but maybe we wanna support external palettes in the future.
Diffstat (limited to 'src/libsystemd-terminal/term-parser.c')
-rw-r--r--src/libsystemd-terminal/term-parser.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/libsystemd-terminal/term-parser.c b/src/libsystemd-terminal/term-parser.c
index f9326d563a..8ec6345d60 100644
--- a/src/libsystemd-terminal/term-parser.c
+++ b/src/libsystemd-terminal/term-parser.c
@@ -35,6 +35,122 @@
#include "term-internal.h"
#include "util.h"
+static const uint8_t default_palette[18][3] = {
+ { 0, 0, 0 }, /* black */
+ { 205, 0, 0 }, /* red */
+ { 0, 205, 0 }, /* green */
+ { 205, 205, 0 }, /* yellow */
+ { 0, 0, 238 }, /* blue */
+ { 205, 0, 205 }, /* magenta */
+ { 0, 205, 205 }, /* cyan */
+ { 229, 229, 229 }, /* light grey */
+ { 127, 127, 127 }, /* dark grey */
+ { 255, 0, 0 }, /* light red */
+ { 0, 255, 0 }, /* light green */
+ { 255, 255, 0 }, /* light yellow */
+ { 92, 92, 255 }, /* light blue */
+ { 255, 0, 255 }, /* light magenta */
+ { 0, 255, 255 }, /* light cyan */
+ { 255, 255, 255 }, /* white */
+
+ { 229, 229, 229 }, /* light grey */
+ { 0, 0, 0 }, /* black */
+};
+
+static uint32_t term_color_to_argb32(const term_color *color, const term_attr *attr, const uint8_t *palette) {
+ static const uint8_t bval[] = {
+ 0x00, 0x5f, 0x87,
+ 0xaf, 0xd7, 0xff,
+ };
+ uint8_t r, g, b, t;
+
+ assert(color);
+
+ if (!palette)
+ palette = (void*)default_palette;
+
+ switch (color->ccode) {
+ case TERM_CCODE_RGB:
+ r = color->red;
+ g = color->green;
+ b = color->blue;
+
+ break;
+ case TERM_CCODE_256:
+ t = color->c256;
+ if (t < 16) {
+ r = palette[t * 3 + 0];
+ g = palette[t * 3 + 1];
+ b = palette[t * 3 + 2];
+ } else if (t < 232) {
+ t -= 16;
+ b = bval[t % 6];
+ t /= 6;
+ g = bval[t % 6];
+ t /= 6;
+ r = bval[t % 6];
+ } else {
+ t = (t - 232) * 10 + 8;
+ r = t;
+ g = t;
+ b = t;
+ }
+
+ break;
+ case TERM_CCODE_BLACK ... TERM_CCODE_LIGHT_WHITE:
+ t = color->ccode - TERM_CCODE_BLACK;
+
+ /* bold causes light colors */
+ if (t < 8 && attr->bold)
+ t += 8;
+
+ r = palette[t * 3 + 0];
+ g = palette[t * 3 + 1];
+ b = palette[t * 3 + 2];
+ break;
+ case TERM_CCODE_DEFAULT:
+ /* fallthrough */
+ default:
+ t = 16 + !(color == &attr->fg);
+ r = palette[t * 3 + 0];
+ g = palette[t * 3 + 1];
+ b = palette[t * 3 + 2];
+ break;
+ }
+
+ return (0xff << 24) | (r << 16) | (g << 8) | b;
+}
+
+/**
+ * term_attr_to_argb32() - Encode terminal colors as native ARGB32 value
+ * @color: Terminal attributes to work on
+ * @fg: Storage for foreground color (or NULL)
+ * @bg: Storage for background color (or NULL)
+ * @palette: The color palette to use (or NULL for default)
+ *
+ * This encodes the colors attr->fg and attr->bg as native-endian ARGB32 values
+ * and returns them. Any color conversions are automatically applied.
+ */
+void term_attr_to_argb32(const term_attr *attr, uint32_t *fg, uint32_t *bg, const uint8_t *palette) {
+ uint32_t f, b, t;
+
+ assert(attr);
+
+ f = term_color_to_argb32(&attr->fg, attr, palette);
+ b = term_color_to_argb32(&attr->bg, attr, palette);
+
+ if (attr->inverse) {
+ t = f;
+ f = b;
+ b = t;
+ }
+
+ if (fg)
+ *fg = f;
+ if (bg)
+ *bg = b;
+}
+
/**
* term_utf8_encode() - Encode single UCS-4 character as UTF-8
* @out_utf8: output buffer of at least 4 bytes or NULL