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elinks/src/terminal/color.h

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