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103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
#ifndef EL__TERMINAL_COLOR_H
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#define EL__TERMINAL_COLOR_H
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#include "util/color.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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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_256(color) ((color)[0])
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#define TERM_COLOR_BACKGROUND_256(color) ((color)[1])
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#endif
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#define TERM_COLOR_FOREGROUND_16(color) ((color)[0] & TERM_COLOR_MASK)
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#define TERM_COLOR_BACKGROUND_16(color) (((color)[0] >> 4) & TERM_COLOR_MASK)
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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 don't support these attributes. */
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COLOR_ENHANCE_UNDERLINE = 2,
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/** Adjust the foreground 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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typedef unsigned char color_flags_T;
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/** How many colors the terminal supports.
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* These numbers are used in the terminal._template_.colors and
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* document.dump.color_mode options. They should be kept stable so
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* that configuration files are portable between ELinks versions.
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* Any unsupported modes should be treated as COLOR_MODE_16.
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* (Can't fall back to COLOR_MODE_88 from COLOR_MODE_256 because
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* the palettes are incompatible.) */
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enum color_mode {
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COLOR_MODE_DUMP = -1,
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COLOR_MODE_MONO = 0,
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COLOR_MODE_16 = 1,
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#ifdef CONFIG_88_COLORS
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COLOR_MODE_88 = 2,
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#endif
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#ifdef CONFIG_256_COLORS
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COLOR_MODE_256 = 3,
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#endif
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#ifdef CONFIG_TRUE_COLOR
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COLOR_MODE_TRUE_COLOR = 4,
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#endif
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COLOR_MODES = 5, /* XXX: Keep last */
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};
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typedef int color_mode_T;
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void set_term_color16(struct screen_char *schar, color_flags_T 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 @a flags has masked in the ::COLOR_INCREASE_CONTRAST the
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* foreground color will be adjusted.
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*
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* XXX: @a schar may not be NULL and is modified adding stuff like
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* boldness. */
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color_T get_term_color16(unsigned int index);
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#ifdef CONFIG_88_COLORS
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color_T get_term_color88(unsigned int index);
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#endif
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#ifdef CONFIG_256_COLORS
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color_T get_term_color256(unsigned int index);
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#endif
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void get_screen_char_color(struct screen_char *schar, struct color_pair *pair,
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color_flags_T flags, color_mode_T color_mode);
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void set_term_color(struct screen_char *schar, struct color_pair *pair,
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color_flags_T flags, color_mode_T mode);
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#ifdef __cplusplus
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}
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#endif
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#endif
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