support 24bit color selection by SGR (Select Graphic Rendition)
example) ESC [ 38 ; 2 ; 255 ; 255 ; 255 m ESC [ 48 ; 2 ; 255 ; 255 ; 255 m - this is NOT a "true 24bit color" support just select approximate color from 256 color palette - currently only support semicolon (;) as a separator I will support colon (:) in future - this implementation does NOT work with OSC 4 (change color palette)
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uobikiemukot
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036b9d0bd7
1 changed files with 102 additions and 2 deletions
104
ctrlseq/csi.h
104
ctrlseq/csi.h
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@ -221,8 +221,95 @@ void erase_char(struct terminal_t *term, struct parm_t *parm)
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erase_cell(term, term->cursor.y, i);
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}
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uint8_t rgb2index(uint8_t r, uint8_t g, uint8_t b)
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{
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/* SGR: Set Graphic Rendition (special case)
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* special color selection (from 256color index or as a 24bit color value)
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*
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* ESC [ 38 ; 5 ; Ps m
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* ESC [ 48 ; 5 ; Ps m
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* select foreground/background color from 256 color index
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*
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* ESC [ 38 ; 2 ; r ; g ; b m
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* ESC [ 48 ; 2 ; r ; g ; b m
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* select foreground/background color as a 24bit color value
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*
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* according to ITU T.416 (https://www.itu.int/rec/T-REC-T.416/en)
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* this format is valid (but most of terminals don't support)
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* ESC [ 38 : 5 : Ps m
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* ESC [ 48 : 5 : Ps m
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*
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* ESC [ 48 : 2 : r : g : b m
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* ESC [ 38 : 2 : r : g : b m
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*/
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int padding;
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uint8_t index;
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/* XXX: this calculation fails if color palette modified by OSC 4 */
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if (r == g && g == b) {
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/* search from grayscale */
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/* grayscale start from 0x08
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and each step inc 0x0A */
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padding = (r - 0x08) / 0x0A;
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if (padding <= 0)
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index = 232;
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else if (padding >= 24)
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index = 231;
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else
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index = 232 + padding;
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} else {
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/* search from 6x6x6 color cube */
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/* each rgb take 6 values: {0x00, 0x5F, 0x87, 0xAF, 0xD7, 0xFF}
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and after 0x5F each step inc 0x28 */
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const uint8_t values[] = {0x0, 0x5F, 0x87, 0xAF, 0xD7, 0xFF};
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const uint8_t rgb[] = {r, g, b};
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uint8_t closest_index[3];
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int small, big;
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for (int c = 0; c < 3; c++) {
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for (int i = 0; i < 5; i++) {
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if (values[i] <= rgb[c] && rgb[c] <= values[i + 1]) {
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small = abs(rgb[c] - values[i]);
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big = abs(rgb[c] - values[i + 1]);
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if (small < big)
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closest_index[c] = i;
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else
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closest_index[c] = i + 1;
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}
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}
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}
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index = 16 + closest_index[0] * 36 + closest_index[1] * 6 + closest_index[2];
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}
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return index;
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}
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void set_attr(struct terminal_t *term, struct parm_t *parm)
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{
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/* SGR: Set Graphic Rendition
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* ESC [ Pm m
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* Pm:
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* 0: reset all attribute
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*
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* 1: brighten foreground color (only work for color index 0-7)
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* 4: underline
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* 5: brighten background color (only work for color index 0-7)
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* 7: reverse (swap foreground/background color)
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*
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* 21: reset brighten foreground color
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* 24: reset underline
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* 25: reset brighten background color
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* 27: reset reverse
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*
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* 30-37: select foreground color (color index 0-7)
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* 38: special foreground color selection: implemented in select_color_value()
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*
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* 40-47: select background color (color index 0-7)
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* 48: special foreground color selection: implemented in select_color_value()
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*/
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int i, num;
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if (parm->argc <= 0) {
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@ -234,6 +321,7 @@ void set_attr(struct terminal_t *term, struct parm_t *parm)
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for (i = 0; i < parm->argc; i++) {
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num = dec2num(parm->argv[i]);
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//logging(DEBUG, "argc:%d num:%d\n", parm->argc, num);
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if (num == 0) { /* reset all attribute and color */
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term->attribute = ATTR_RESET;
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@ -245,19 +333,31 @@ void set_attr(struct terminal_t *term, struct parm_t *parm)
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term->attribute &= ~attr_mask[num - 20];
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} else if (30 <= num && num <= 37) { /* set foreground */
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term->color_pair.fg = (num - 30);
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} else if (num == 38) { /* set 256 color to foreground */
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} else if (num == 38) { /* special foreground color selection */
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/* select foreground color from 256 color index */
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if ((i + 2) < parm->argc && dec2num(parm->argv[i + 1]) == 5) {
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term->color_pair.fg = dec2num(parm->argv[i + 2]);
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i += 2;
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/* select foreground color from specified rgb color */
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} else if ((i + 4) < parm->argc && dec2num(parm->argv[i + 1]) == 2) {
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term->color_pair.fg = rgb2index(dec2num(parm->argv[i + 2]),
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dec2num(parm->argv[i + 3]), dec2num(parm->argv[i + 4]));
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i += 2;
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}
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} else if (num == 39) { /* reset foreground */
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term->color_pair.fg = DEFAULT_FG;
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} else if (40 <= num && num <= 47) { /* set background */
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term->color_pair.bg = (num - 40);
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} else if (num == 48) { /* set 256 color to background */
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} else if (num == 48) { /* special background color selection */
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/* select background color from 256 color index */
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if ((i + 2) < parm->argc && dec2num(parm->argv[i + 1]) == 5) {
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term->color_pair.bg = dec2num(parm->argv[i + 2]);
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i += 2;
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/* select background color from specified rgb color */
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} else if ((i + 4) < parm->argc && dec2num(parm->argv[i + 1]) == 2) {
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term->color_pair.bg = rgb2index(dec2num(parm->argv[i + 2]),
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dec2num(parm->argv[i + 3]), dec2num(parm->argv[i + 4]));
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i += 2;
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}
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} else if (num == 49) { /* reset background */
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term->color_pair.bg = DEFAULT_BG;
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