mirror of
https://github.com/rkd77/elinks.git
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381 lines
9.3 KiB
C
381 lines
9.3 KiB
C
/* Terminal color composing. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "elinks.h"
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#include "terminal/color.h"
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#include "terminal/draw.h"
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#include "util/color.h"
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#include "util/error.h"
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struct rgb {
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unsigned char r, g, b;
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unsigned char pad;
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};
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#include "terminal/palette.inc"
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struct rgb_cache_entry {
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int color;
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int level;
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color_T rgb;
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};
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static inline int
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color_distance(struct rgb *c1, struct rgb *c2)
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{
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int r = c1->r - c2->r;
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int g = c1->g - c2->g;
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int b = c1->b - c2->b;
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return (3 * r * r) + (4 * g * g) + (2 * b * b);
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}
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#define RED_COLOR_MASK 0x00FF0000
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#define GREEN_COLOR_MASK 0x0000FF00
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#define BLUE_COLOR_MASK 0x000000FF
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#define RED_COLOR(color) (((color) & RED_COLOR_MASK) >> 16)
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#define GREEN_COLOR(color) (((color) & GREEN_COLOR_MASK) >> 8)
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#define BLUE_COLOR(color) (((color) & BLUE_COLOR_MASK) >> 0)
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#define RED(color) (RED_COLOR(color) << 3)
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#define GREEN(color) (GREEN_COLOR(color) << 2)
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#define BLUE(color) (BLUE_COLOR(color) << 0)
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#define RGBCOLOR(color) (RED(color) + GREEN(color) + BLUE(color))
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#define RGB_HASH_SIZE 4096
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#define HASH_RGB(color, l) ((RGBCOLOR(color) + (l)) & (RGB_HASH_SIZE - 1))
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/* Initialize a rgb struct from a color_T */
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#define INIT_RGB(color) \
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{ RED_COLOR(color), GREEN_COLOR(color), BLUE_COLOR(color) }
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/* Locates the nearest terminal color. */
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static inline unsigned char
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get_color(color_T color, struct rgb *palette, int level)
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{
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static struct rgb_cache_entry cache[RGB_HASH_SIZE];
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struct rgb_cache_entry *rgb_cache = &cache[HASH_RGB(color, level)];
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/* Uninitialized cache entries have level set to zero. */
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if (rgb_cache->level == 0
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|| rgb_cache->level != level
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|| rgb_cache->rgb != color) {
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struct rgb rgb = INIT_RGB(color);
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unsigned char nearest_color = 0;
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int min_dist = color_distance(&rgb, &palette[0]);
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int i;
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#ifdef CONFIG_DEBUG
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if (level <= 0)
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INTERNAL("get_color() called with @level <= 0");
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#endif
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for (i = 1; i < level; i++) {
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int dist = color_distance(&rgb, &palette[i]);
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if (dist < min_dist) {
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min_dist = dist;
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nearest_color = i;
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}
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}
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rgb_cache->color = nearest_color;
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rgb_cache->level = level;
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rgb_cache->rgb = color;
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}
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return rgb_cache->color;
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}
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#undef INIT_RGB
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#undef HASH_RGB
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#undef RGB_HASH_SIZE
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#undef RED
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#undef GREEN
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#undef BLUE
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#undef RED_COLOR
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#undef GREEN_COLOR
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#undef BLUE_COLOR
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#undef RED_COLOR_MASK
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#undef GREEN_COLOR_MASK
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#undef BLUE_COLOR_MASK
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/* Controls what color ranges to use when setting the terminal color. */
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/* TODO: Part of the 256 color palette is gray scale, maybe we could experiment
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* with a grayscale mode. ;) --jonas */
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enum palette_range {
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PALETTE_FULL = 0,
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PALETTE_HALF,
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PALETTE_RANGES, /* XXX: Keep last */
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};
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struct color_mode_info {
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struct rgb *palette;
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struct {
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int bg;
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int fg;
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} palette_range[PALETTE_RANGES];
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};
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static struct color_mode_info color_mode_16 = {
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palette16,
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{
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/* PALETTE_FULL */ { 8, 16 },
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/* PALETTE_HALF */ { 8, 8 },
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}
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};
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#ifdef CONFIG_88_COLORS
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static struct color_mode_info color_mode_88 = {
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palette88,
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{
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/* PALETTE_FULL */ { 88, 88 },
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/* PALETTE_HALF */ { 88, 44 },
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}
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};
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#endif
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#ifdef CONFIG_256_COLORS
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static struct color_mode_info color_mode_256 = {
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palette256,
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{
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/* PALETTE_FULL */ { 256, 256 },
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/* PALETTE_HALF */ { 256, 128 },
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}
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};
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#endif
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static struct color_mode_info *color_modes[] = {
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/* COLOR_MODE_MONO */ &color_mode_16,
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/* COLOR_MODE_16 */ &color_mode_16,
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#ifdef CONFIG_88_COLORS
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/* COLOR_MODE_88 */ &color_mode_88,
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#endif
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#ifdef CONFIG_256_COLORS
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/* COLOR_MODE_256 */ &color_mode_256,
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#endif
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};
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/* Colors values used in the foreground color table:
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*
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* 0 == black 8 == darkgrey (brightblack ;)
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* 1 == red 9 == brightred
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* 2 == green 10 == brightgreen
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* 3 == brown 11 == brightyellow
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* 4 == blue 12 == brightblue
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* 5 == magenta 13 == brightmagenta
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* 6 == cyan 14 == brightcyan
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* 7 == white 15 == brightwhite
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*
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* Bright colors will be rendered bold. */
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/* This table is based mostly on wild guesses of mine. Feel free to
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* correct it. --pasky */
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/* Indexed by [fg][bg]->fg: */
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static unsigned char fg_color[16][8] = {
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/* bk r gr br bl m c w */
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/* 0 (black) */
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{ 7, 0, 0, 0, 7, 0, 0, 0 },
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/* 1 (red) */
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{ 1, 9, 1, 9, 9, 9, 1, 1 },
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/* 2 (green) */
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{ 2, 2, 10, 2, 2, 2, 10, 10 },
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/* 3 (brown) */
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{ 3, 11, 3, 11, 3, 11, 3, 3 },
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/* 4 (blue) */
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{ 12, 12, 6, 4, 12, 6, 4, 4 },
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/* 5 (magenta) */
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{ 5, 13, 5, 13, 13, 13, 5, 5 },
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/* 6 (cyan) */
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{ 6, 6, 14, 6, 6, 6, 14, 14 },
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/* 7 (grey) */
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{ 7, 7, 0, 7, 7, 7, 0, 0 }, /* Don't s/0/8/, messy --pasky */
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/* 8 (darkgrey) */
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{ 15, 15, 8, 15, 15, 15, 8, 8 },
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/* 9 (brightred) */
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{ 9, 9, 1, 9, 9, 9, 1, 9 }, /* I insist on 7->9 --pasky */
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/* 10 (brightgreen) */
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{ 10, 10, 10, 10, 10, 10, 10, 10 },
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/* 11 (brightyellow) */
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{ 11, 11, 11, 11, 11, 11, 11, 11 },
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/* 12 (brightblue) */
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{ 12, 12, 6, 4, 6, 6, 4, 12 },
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/* 13 (brightmagenta) */
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{ 13, 13, 5, 13, 13, 13, 5, 5 },
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/* 14 (brightcyan) */
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{ 14, 14, 14, 14, 14, 14, 14, 14 },
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/* 15 (brightwhite) */
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{ 15, 15, 15, 15, 15, 15, 15, 15 },
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};
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/* When determining wether to use negative image we make the most significant
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* be least significant. */
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#define CMPCODE(c) (((c) << 1 | (c) >> 2) & TERM_COLOR_MASK)
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#define use_inverse(bg, fg) CMPCODE(fg & TERM_COLOR_MASK) < CMPCODE(bg)
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inline void
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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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{
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/* Adjusts the foreground color to be more visible. */
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if (flags & COLOR_INCREASE_CONTRAST) {
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fg = fg_color[fg][bg];
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}
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/* Add various color enhancement based on the attributes. */
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if (schar->attr) {
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if (schar->attr & SCREEN_ATTR_ITALIC)
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fg ^= 0x01;
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if (schar->attr & SCREEN_ATTR_BOLD)
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fg |= SCREEN_ATTR_BOLD;
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if ((schar->attr & SCREEN_ATTR_UNDERLINE)
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&& (flags & COLOR_ENHANCE_UNDERLINE)) {
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fg |= SCREEN_ATTR_BOLD;
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fg ^= 0x04;
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}
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}
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/* Adjusts the foreground color to be more visible. */
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if ((flags & COLOR_INCREASE_CONTRAST)
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|| (bg == fg && (flags & COLOR_ENSURE_CONTRAST))) {
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if (flags & COLOR_ENSURE_INVERTED_CONTRAST) {
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unsigned char contrastbg = fg_color[fg][bg];
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fg = bg;
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bg = contrastbg;
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} else {
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fg = fg_color[fg][bg];
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}
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}
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if (fg & SCREEN_ATTR_BOLD) {
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schar->attr |= SCREEN_ATTR_BOLD;
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}
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if (use_inverse(bg, fg)) {
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schar->attr |= SCREEN_ATTR_STANDOUT;
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}
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#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
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/* With 256 color support we use memcmp() when comparing color in
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* terminal/screen.c:add_char*() so we need to clear this byte. */
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TERM_COLOR_FOREGROUND(schar->color) = (fg & TERM_COLOR_MASK);
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TERM_COLOR_BACKGROUND(schar->color) = bg;
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#else
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schar->color[0] = (bg << 4 | fg);
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#endif
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}
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void
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set_term_color(struct screen_char *schar, struct color_pair *pair,
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enum color_flags flags, enum color_mode color_mode)
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{
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struct color_mode_info *mode;
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enum palette_range palette_range = PALETTE_FULL;
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unsigned char fg, bg;
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assert(color_mode >= COLOR_MODE_DUMP && color_mode < COLOR_MODES);
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/* Options for the various color modes. */
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switch (color_mode) {
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case COLOR_MODE_MONO:
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/* TODO: A better way if possible to find out whether to
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* inverse the fore- and backgroundcolor. Else figure out what:
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*
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* CMPCODE(c) (((c) << 1 | (c) >> 2) & TERM_COLOR_MASK)
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*
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* mean. :) --jonas */
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/* Decrease the range of the 16 palette to not include
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* bright colors. */
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if (flags & COLOR_DECREASE_LIGHTNESS) {
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palette_range = PALETTE_HALF;
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schar->attr |= SCREEN_ATTR_STANDOUT;
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}
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break;
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case COLOR_MODE_16:
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/* Decrease the range of the 16 palette to not include
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* bright colors. */
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if (flags & COLOR_DECREASE_LIGHTNESS)
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palette_range = PALETTE_HALF;
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break;
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#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
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#ifdef CONFIG_88_COLORS
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case COLOR_MODE_88:
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#endif
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#ifdef CONFIG_256_COLORS
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case COLOR_MODE_256:
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#endif
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/* TODO: Handle decrease lightness by converting to
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* hue-ligthness-saturation color model */
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break;
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#endif
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case COLOR_MODE_DUMP:
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return;
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case COLOR_MODES:
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/* This is caught by the assert() above. */
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return;
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}
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assert(schar);
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mode = color_modes[color_mode];
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fg = get_color(pair->foreground, mode->palette, mode->palette_range[palette_range].fg);
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bg = get_color(pair->background, mode->palette, mode->palette_range[palette_range].bg);
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switch (color_mode) {
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case COLOR_MODES:
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case COLOR_MODE_DUMP:
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INTERNAL("Bad color mode, it should _never_ occur here.");
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break;
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#if defined(CONFIG_88_COLORS) || defined(CONFIG_256_COLORS)
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#ifdef CONFIG_88_COLORS
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case COLOR_MODE_88:
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#endif
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#ifdef CONFIG_256_COLORS
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case COLOR_MODE_256:
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#endif
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/* Adjusts the foreground color to be more visible. */
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/* TODO: Be smarter! Here we just choose either black or white
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* ANSI color to make sure the color is visible. Pasky
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* mentioned maybe calculating a distance and choosing some
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* intermediate color. --jonas */
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/* TODO: Maybe also do something to honour the increase_contrast
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* option. --jonas */
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if (bg == fg && (flags & COLOR_ENSURE_CONTRAST)) {
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if (flags & COLOR_ENSURE_INVERTED_CONTRAST) {
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bg = (fg == 0) ? 15 : 0;
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} else {
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fg = (bg == 0) ? 15 : 0;
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}
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}
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TERM_COLOR_FOREGROUND(schar->color) = fg;
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TERM_COLOR_BACKGROUND(schar->color) = bg;
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break;
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#endif
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case COLOR_MODE_MONO:
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case COLOR_MODE_16:
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set_term_color16(schar, flags, fg, bg);
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break;
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}
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}
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