terminal: Scroll margins
Implement scroll margins and related escape codes. Signed-off-by: Callum Lowcay <callum@callumscode.com>
This commit is contained in:
Callum Lowcay
Kristian Høgsberg
parent
b8609ada50
commit
bbeac60b8a
@ -187,7 +187,9 @@ struct terminal {
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union utf8_char *data;
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struct attr *data_attr;
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struct attr curr_attr;
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char origin_mode;
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union utf8_char last_char;
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int margin_top, margin_bottom;
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int data_pitch, attr_pitch; /* The width in bytes of a line */
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int width, height, start, row, column;
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int fd, master;
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@ -211,6 +213,7 @@ static void
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terminal_init(struct terminal *terminal)
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{
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terminal->curr_attr = terminal->color_scheme->default_attr;
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terminal->origin_mode = 0;
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terminal->row = 0;
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terminal->column = 0;
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@ -265,6 +268,94 @@ terminal_get_attr(struct terminal *terminal, int row, int col) {
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return terminal_get_attr_row(terminal, row)[col];
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}
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static void
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terminal_scroll_buffer(struct terminal *terminal, int d)
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{
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int i;
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d = d % (terminal->height + 1);
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terminal->start = (terminal->start + d) % terminal->height;
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if (terminal->start < 0) terminal->start = terminal->height + terminal->start;
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if(d < 0) {
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d = 0 - d;
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for(i = 0; i < d; i++) {
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memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
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attr_init(terminal_get_attr_row(terminal, i),
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terminal->curr_attr, terminal->width);
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}
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} else {
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for(i = terminal->height - d; i < terminal->height; i++) {
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memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
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attr_init(terminal_get_attr_row(terminal, i),
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terminal->curr_attr, terminal->width);
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}
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}
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}
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static void
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terminal_scroll_window(struct terminal *terminal, int d)
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{
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int i;
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int window_height;
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int from_row, to_row;
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struct attr *dup_attr;
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// scrolling range is inclusive
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window_height = terminal->margin_bottom - terminal->margin_top + 1;
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d = d % (window_height + 1);
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if(d < 0) {
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d = 0 - d;
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to_row = terminal->margin_bottom;
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from_row = terminal->margin_bottom - d;
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for (i = 0; i < (window_height - d); i++) {
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memcpy(terminal_get_row(terminal, to_row - i),
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terminal_get_row(terminal, from_row - i),
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terminal->data_pitch);
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memcpy(terminal_get_attr_row(terminal, to_row - i),
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terminal_get_attr_row(terminal, from_row - i),
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terminal->attr_pitch);
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}
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dup_attr = terminal_get_attr_row(terminal, terminal->margin_top);
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for (i = terminal->margin_top; i < (terminal->margin_top + d); i++) {
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memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
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if (i > terminal->margin_top) {
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memcpy(terminal_get_attr_row(terminal, i),
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dup_attr, terminal->attr_pitch);
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}
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}
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} else {
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to_row = terminal->margin_top;
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from_row = terminal->margin_top + d;
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for (i = 0; i < (window_height - d); i++) {
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memcpy(terminal_get_row(terminal, to_row + i),
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terminal_get_row(terminal, from_row + i),
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terminal->data_pitch);
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memcpy(terminal_get_attr_row(terminal, to_row + i),
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terminal_get_attr_row(terminal, from_row + i),
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terminal->attr_pitch);
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}
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dup_attr = terminal_get_attr_row(terminal, terminal->margin_bottom);
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for (i = terminal->margin_bottom - d + 1; i <= terminal->margin_bottom; i++) {
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memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
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if (i < terminal->margin_bottom) {
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memcpy(terminal_get_attr_row(terminal, i),
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dup_attr, terminal->attr_pitch);
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}
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}
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}
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}
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static void
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terminal_scroll(struct terminal *terminal, int d)
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{
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if(terminal->margin_top == 0 && terminal->margin_bottom == terminal->height - 1)
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terminal_scroll_buffer(terminal, d);
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else
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terminal_scroll_window(terminal, d);
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}
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static void
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terminal_resize(struct terminal *terminal, int width, int height)
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{
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@ -317,6 +408,8 @@ terminal_resize(struct terminal *terminal, int width, int height)
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terminal->attr_pitch = attr_pitch;
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terminal->width = width;
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terminal->height = height;
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if(terminal->margin_bottom >= terminal->height)
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terminal->margin_bottom = terminal->height - 1;
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terminal->data = data;
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terminal->data_attr = data_attr;
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@ -530,13 +623,39 @@ handle_char(struct terminal *terminal, union utf8_char utf8);
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static void
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handle_sgr(struct terminal *terminal, int code);
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static void
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handle_term_parameter(struct terminal *terminal, int code, int sr)
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{
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if (terminal->qmark_flag) {
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switch(code) {
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case 6: /* DECOM */
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terminal->origin_mode = sr;
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if (terminal->origin_mode)
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terminal->row = terminal->margin_top;
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else
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terminal->row = 0;
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terminal->column = 0;
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break;
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default:
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fprintf(stderr, "Unknown parameter: ?%d\n", code);
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break;
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}
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} else {
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switch(code) {
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default:
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fprintf(stderr, "Unknown parameter: %d\n", code);
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break;
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}
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}
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}
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static void
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handle_escape(struct terminal *terminal)
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{
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union utf8_char *row;
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struct attr *attr_row;
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char *p;
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int i, count;
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int i, count, top, bottom;
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int args[10], set[10] = { 0, };
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terminal->escape[terminal->escape_length++] = '\0';
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@ -610,6 +729,22 @@ handle_escape(struct terminal *terminal)
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memset(&row[terminal->column], 0, (terminal->width - terminal->column) * sizeof(union utf8_char));
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attr_init(&attr_row[terminal->column], terminal->curr_attr, (terminal->width - terminal->column));
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break;
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case 'S': /* SU */
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terminal_scroll(terminal, set[0] ? args[0] : 1);
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break;
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case 'T': /* SD */
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terminal_scroll(terminal, 0 - (set[0] ? args[0] : 1));
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break;
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case 'h': /* SM */
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for(i = 0; i < 10 && set[i]; i++) {
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handle_term_parameter(terminal, args[i], 1);
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}
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break;
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case 'l': /* RM */
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for(i = 0; i < 10 && set[i]; i++) {
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handle_term_parameter(terminal, args[i], 0);
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}
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break;
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case 'm': /* SGR */
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if (set[0] && set[1] && set[2] && args[1] == 5) {
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if (args[0] == 38) {
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@ -631,11 +766,31 @@ handle_escape(struct terminal *terminal)
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}
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}
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break;
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case '?':
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if (strcmp(p, "?25l") == 0) {
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/* hide cursor */
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} else if (strcmp(p, "?25h") == 0) {
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/* show cursor */
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case 'r':
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if(!set[0]) {
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terminal->margin_top = 0;
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terminal->margin_bottom = terminal->height-1;
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terminal->row = 0;
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terminal->column = 0;
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} else {
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top = (set[0] ? args[0] : 1) - 1;
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top = top < 0 ? 0 :
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(top >= terminal->height ? terminal->height - 1 : top);
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bottom = (set[1] ? args[1] : 1) - 1;
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bottom = bottom < 0 ? 0 :
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(bottom >= terminal->height ? terminal->height - 1 : bottom);
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if(bottom > top) {
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terminal->margin_top = top;
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terminal->margin_bottom = bottom;
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} else {
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terminal->margin_top = 0;
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terminal->margin_bottom = terminal->height-1;
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}
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if(terminal->origin_mode)
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terminal->row = terminal->margin_top;
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else
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terminal->row = 0;
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terminal->column = 0;
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}
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break;
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default:
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@ -647,6 +802,28 @@ handle_escape(struct terminal *terminal)
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static void
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handle_non_csi_escape(struct terminal *terminal, char code)
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{
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switch(code) {
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case 'M': /* RI */
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terminal->row -= 1;
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if(terminal->row < terminal->margin_top) {
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terminal->row = terminal->margin_top;
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terminal_scroll(terminal, -1);
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}
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break;
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case 'E': /* NEL */
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terminal->column = 0;
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// fallthrough
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case 'D': /* IND */
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terminal->row += 1;
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if(terminal->row > terminal->margin_bottom) {
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terminal->row = terminal->margin_bottom;
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terminal_scroll(terminal, +1);
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}
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break;
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default:
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fprintf(stderr, "Unknown escape code: %c\n", code);
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break;
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}
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}
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static void
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@ -735,16 +912,10 @@ handle_special_char(struct terminal *terminal, char c)
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/* fallthrough */
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case '\v':
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case '\f':
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if (terminal->row + 1 < terminal->height) {
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terminal->row++;
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} else {
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terminal->start++;
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if (terminal->start == terminal->height)
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terminal->start = 0;
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memset(terminal_get_row(terminal, terminal->row),
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0, terminal->width * sizeof(union utf8_char));
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attr_init(terminal_get_attr_row(terminal, terminal->row),
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terminal->curr_attr, terminal->width);
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terminal->row++;
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if(terminal->row > terminal->margin_bottom) {
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terminal->row = terminal->margin_bottom;
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terminal_scroll(terminal, +1);
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}
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break;
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@ -969,6 +1140,9 @@ terminal_create(struct display *display, int fullscreen)
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terminal->fullscreen = fullscreen;
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terminal->color_scheme = &DEFAULT_COLORS;
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terminal_init(terminal);
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terminal->margin_top = 0;
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terminal->margin_bottom = 10000; /* much too large, will be trimmed down
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* by terminal_resize */
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terminal->window = window_create(display, "Wayland Terminal",
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500, 400);
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