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terminal: make scrollback more efficient?

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This commit is contained in:
K. Lange 2021-10-23 12:40:02 +09:00
parent 8b363c878b
commit 43772cbbb0
1 changed files with 22 additions and 8 deletions
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30
apps/terminal.c
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@ -170,7 +170,7 @@ struct scrollback_row {
term_cell_t cells[];
};
#define MAX_SCROLLBACK 10240
#define MAX_SCROLLBACK 1000
static list_t * scrollback_list = NULL;
static int scrollback_offset = 0;
@ -1099,20 +1099,34 @@ static int is_wide(uint32_t codepoint) {
static void save_scrollback(void) {
/* If the scrollback is already full, remove the oldest element. */
struct scrollback_row * row = NULL;
node_t * n = NULL;
if (scrollback_list->length == MAX_SCROLLBACK) {
node_t * n = list_dequeue(scrollback_list);
free(n->value);
free(n);
n = list_dequeue(scrollback_list);
row = n->value;
if (row->width < term_width) {
free(row);
row = NULL;
}
}
if (!row) {
row = malloc(sizeof(struct scrollback_row) + sizeof(term_cell_t) * term_width);
row->width = term_width;
}
if (!n) {
list_insert(scrollback_list, row);
} else {
n->value = row;
list_append(scrollback_list, n);
}
struct scrollback_row * row = malloc(sizeof(struct scrollback_row) + sizeof(term_cell_t) * term_width + 20);
row->width = term_width;
for (int i = 0; i < term_width; ++i) {
term_cell_t * cell = (term_cell_t *)((uintptr_t)term_buffer + (i) * sizeof(term_cell_t));
memcpy(&row->cells[i], cell, sizeof(term_cell_t));
}
list_insert(scrollback_list, row);
}
/* Draw the scrollback. */