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scrolling: initial reverse scrolling support - no scroll regions

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Daniel Eklöf 2019-07-03 10:45:49 +02:00
parent 048f619b19
commit a7a28ff581
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GPG key ID: 5BBD4992C116573F
4 changed files with 47 additions and 51 deletions
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23
grid.c
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@ -8,12 +8,15 @@
#include "log.h"
struct cell *
grid_get_range(struct grid *grid, size_t start, size_t *length)
grid_get_range(struct grid *grid, int start, int *length)
{
#define min(x, y) ((x) < (y) ? (x) : (y))
assert(*length <= grid->size);
size_t real_start = (grid->offset + start) % grid->size;
int real_start = (grid->offset + start) % grid->size;
if (real_start < 0)
real_start += grid->size;
assert(real_start >= 0);
assert(real_start < grid->size);
*length = min(*length, grid->size - real_start);
@ -24,11 +27,11 @@ grid_get_range(struct grid *grid, size_t start, size_t *length)
}
void
grid_memset(struct grid *grid, size_t start, int c, size_t length)
grid_memset(struct grid *grid, int start, int c, int length)
{
size_t left = length;
int left = length;
while (left > 0) {
size_t count = left;
int count = left;
struct cell *cells = grid_get_range(grid, start, &count);
assert(count > 0);
@ -42,14 +45,14 @@ grid_memset(struct grid *grid, size_t start, int c, size_t length)
}
void
grid_memmove(struct grid *grid, size_t dst, size_t src, size_t length)
grid_memmove(struct grid *grid, int dst, int src, int length)
{
size_t left = length;
size_t copy_idx = 0;
int left = length;
int copy_idx = 0;
struct cell copy[left];
while (left > 0) {
size_t count = left;
int count = left;
struct cell *src_cells = grid_get_range(grid, src, &count);
memcpy(&copy[copy_idx], src_cells, count * sizeof(copy[0]));
@ -63,7 +66,7 @@ grid_memmove(struct grid *grid, size_t dst, size_t src, size_t length)
copy_idx = 0;
while (left > 0) {
size_t count = left;
int count = left;
struct cell *dst_cells = grid_get_range(grid, dst, &count);
memcpy(dst_cells, &copy[copy_idx], count * sizeof(copy[0]));