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69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
#ifndef EL__TERMINAL_COLOR_H
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#define EL__TERMINAL_COLOR_H
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struct color_pair;
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struct screen_char;
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/* Terminal color encoding: */
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/* Below color pairs are encoded to terminal colors. Both the terminal fore-
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* and background color are a number between 0 and 7. They are stored in an
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* unsigned char as specified in the following bit sequence:
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*
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* 0bbb0fff (f = foreground, b = background)
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*/
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#define TERM_COLOR_MASK 0x07
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#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
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#define TERM_COLOR_FOREGROUND(color) ((color)[0])
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#define TERM_COLOR_BACKGROUND(color) ((color)[1])
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#else
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#define TERM_COLOR_FOREGROUND(color) ((color)[0] & TERM_COLOR_MASK)
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#define TERM_COLOR_BACKGROUND(color) (((color)[0] >> 4) & TERM_COLOR_MASK)
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#endif
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/* Bit flags to control how the colors are handled. */
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enum color_flags {
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/* Use a decreased color range. */
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COLOR_DECREASE_LIGHTNESS = 1,
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/* Mangle the color to stand out if attributes like underline are set.
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* Useful for terminals that doesn't support these attributes. */
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COLOR_ENHANCE_UNDERLINE = 2,
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/* Adjust the forground color to be more readable by increasing the
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* contrast. */
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COLOR_INCREASE_CONTRAST = 4,
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/* Adjust the contrast if the back- and foregroundcolor is equal.
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* If inverting should be done also pass the latter flag. */
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COLOR_ENSURE_CONTRAST = 8,
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COLOR_ENSURE_INVERTED_CONTRAST = 16,
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};
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enum color_mode {
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COLOR_MODE_DUMP = -1,
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COLOR_MODE_MONO,
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COLOR_MODE_16,
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#ifdef CONFIG_88_COLORS
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COLOR_MODE_88,
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#endif
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#ifdef CONFIG_256_COLORS
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COLOR_MODE_256,
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#endif
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COLOR_MODES, /* XXX: Keep last */
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};
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inline void set_term_color16(struct screen_char *schar, enum color_flags flags,
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unsigned char fg, unsigned char bg);
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/* Mixes the color pair and attributes to a terminal text color. */
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/* If @flags has masked in the COLOR_INCREASE_CONTRAST the foreground color will
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* be adjusted. */
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/* XXX: @schar may not be NULL and is modified adding stuff like boldness. */
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void set_term_color(struct screen_char *schar, struct color_pair *pair,
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enum color_flags flags, enum color_mode mode);
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#endif
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