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wip: initial scrolling support (no scrollback though)

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Daniel Eklöf 2019-06-19 10:27:31 +02:00
parent 71dde121e6
commit efc8cc4914
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GPG key ID: 5BBD4992C116573F
3 changed files with 39 additions and 2 deletions
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24
grid.c
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@ -3,6 +3,10 @@
#include <string.h>
#include <assert.h>
#define LOG_MODULE "grid"
#define LOG_ENABLE_DBG 1
#include "log.h"
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))
@ -11,6 +15,7 @@ grid_erase(struct grid *grid, int start, int end)
{
for (int i = start; i < end; i++) {
struct cell *cell = &grid->cells[i];
/* TODO: memset entire range */
memset(cell, 0, sizeof(*cell));
cell->attrs.foreground = grid->foreground;
@ -76,3 +81,22 @@ grid_cursor_down(struct grid *grid, int count)
int move_amount = min(grid->rows - grid->cursor.row - 1, count);
grid_cursor_to(grid, grid->cursor.row + move_amount, grid->cursor.col);
}
void
grid_scroll(struct grid *grid, int rows)
{
if (rows >= grid->rows) {
grid_erase(grid, 0, grid->rows * grid->cols);
return;
}
int first_row = rows;
int cell_start = first_row * grid->cols;
int cell_end = grid->rows * grid->cols;
int count = cell_end - cell_start;
LOG_DBG("moving %d cells from %d", count, cell_start);
memmove(&grid->cells[0], &grid->cells[cell_start], count * sizeof(grid->cells[0]));
grid_erase(grid, cell_end - rows * grid->cols, grid->rows * grid->cols);
grid->all_dirty = true;
}