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console: rename buffer to scroll-buffer

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The main buffer of the console buffer is now renamed to scroll-buffer.
This allows us to add other buffers like a margin-buffer to the same
buffer object.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
David Herrmann 2012-02-03 15:22:36 +01:00
parent d06e28aa05
commit c4a4e796e7
1 changed files with 97 additions and 82 deletions
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179
src/console_cell.c
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@ -111,8 +111,10 @@ struct kmscon_buffer {
unsigned int size_x;
unsigned int size_y;
unsigned int fill;
struct line **current;
unsigned int scroll_y;
unsigned int scroll_fill;
struct line **scroll_buf;
struct kmscon_m4_stack *stack;
};
@ -252,10 +254,10 @@ void kmscon_buffer_unref(struct kmscon_buffer *buf)
kmscon_buffer_clear_sb(buf);
for (i = 0; i < buf->size_y; ++i)
free_line(buf->current[i]);
for (i = 0; i < buf->scroll_y; ++i)
free_line(buf->scroll_buf[i]);
free(buf->current);
free(buf->scroll_buf);
kmscon_m4_stack_free(buf->stack);
free(buf);
log_debug("console: destroying buffer object\n");
@ -388,6 +390,78 @@ void kmscon_buffer_clear_sb(struct kmscon_buffer *buf)
buf->position = NULL;
}
int resize_scrollbuf(struct kmscon_buffer *buf, unsigned int y)
{
unsigned int fill, i;
struct line *iter, **cache;
/* Resize y size by adjusting the scroll-buffer size */
if (y < buf->scroll_y) {
/*
* Shrink scroll-buffer. First move enough elements from the
* scroll-buffer into the scroll-back buffer so we can shrink
* it without loosing data.
* Then reallocate the buffer (we shrink it so we never fail
* here) and correctly set values in \buf. If the buffer has
* unused lines, we can shrink it down without moving lines into
* the scrollback-buffer so first calculate the current fill of
* the buffer and then move appropriate amount of elements to
* the scrollback buffer.
*/
if (buf->scroll_fill > y) {
for (i = y; i < buf->scroll_fill; ++i)
link_to_scrollback(buf, buf->scroll_buf[i - y]);
memmove(buf->scroll_buf,
&buf->scroll_buf[buf->scroll_fill - y],
y * sizeof(struct line*));
}
buf->scroll_buf = realloc(buf->scroll_buf,
y * sizeof(struct line*));
buf->scroll_y = y;
if (buf->scroll_fill > y)
buf->scroll_fill = y;
} else if (y > buf->scroll_y) {
/*
* Increase scroll-buffer to new size. Reset all new elements
* to NULL so they are empty. Copy existing buffer into new
* buffer and correctly set values in \buf.
* If we have more space in the buffer, we simply move lines
* from the scroll-back buffer into our scroll-buffer if they
* are available. Otherwise, we simply add NULL lines.
*/
cache = malloc(sizeof(struct line*) * y);
if (!cache)
return -ENOMEM;
memset(cache, 0, sizeof(struct line*) * y);
fill = y - buf->scroll_y;
for (i = 0; i < fill; ++i) {
iter = get_from_scrollback(buf);
if (!iter)
break;
cache[y - i - 1] = iter;
}
buf->scroll_fill += i;
memmove(cache, &cache[y - i], i * sizeof(struct line*));
if (buf->scroll_y)
memcpy(&cache[i], buf->scroll_buf,
sizeof(struct line*) * buf->scroll_y);
free(buf->scroll_buf);
buf->scroll_buf = cache;
buf->scroll_y = y;
}
return 0;
}
/*
* Resize the current console buffer
* This resizes the current buffer. We do not resize the lines or modify them in
@ -397,8 +471,7 @@ void kmscon_buffer_clear_sb(struct kmscon_buffer *buf)
int kmscon_buffer_resize(struct kmscon_buffer *buf, unsigned int x,
unsigned int y)
{
unsigned int i, fill;
struct line *iter, **cache;
int ret;
if (!buf)
return -EINVAL;
@ -411,68 +484,10 @@ int kmscon_buffer_resize(struct kmscon_buffer *buf, unsigned int x,
if (buf->size_x == x && buf->size_y == y)
return 0;
/* Resize y size by adjusting the current buffer size */
if (y < buf->size_y) {
/*
* Shrink current buffer. First move enough elements from the
* current buffer into the scroll-back buffer so we can shrink
* it without loosing data.
* Then reallocate the buffer (we shrink it so we never fail
* here) and correctly set values in \buf. If the buffer has
* empty lines, we can shrink it down without moving lines into
* the scrollback-buffer so first calculate the current fill of
* the buffer and then move appropriate amount of elements to
* the scrollback buffer.
*/
if (buf->fill > y) {
for (i = y; i < buf->fill; ++i)
link_to_scrollback(buf, buf->current[i - y]);
memmove(buf->current, &buf->current[buf->fill - y],
y * sizeof(struct line*));
}
buf->current = realloc(buf->current, y * sizeof(struct line*));
buf->size_y = y;
if (buf->fill > y)
buf->fill = y;
} else if (y > buf->size_y) {
/*
* Increase current buffer to new size. Reset all new elements
* to NULL so they are empty. Copy existing buffer into new
* buffer and correctly set values in \buf.
* If we have more space in the buffer, we simply move lines
* from the scroll-back buffer into our current buffer if they
* are available. Otherwise, we simply add NULL lines.
*/
cache = malloc(sizeof(struct line*) * y);
if (!cache)
return -ENOMEM;
memset(cache, 0, sizeof(struct line*) * y);
fill = y - buf->size_y;
for (i = 0; i < fill; ++i) {
iter = get_from_scrollback(buf);
if (!iter)
break;
cache[y - i - 1] = iter;
}
buf->fill += i;
memmove(cache, &cache[y - i], i * sizeof(struct line*));
if (buf->size_y) {
memcpy(&cache[i], buf->current,
sizeof(struct line*) * buf->size_y);
free(buf->current);
}
buf->current = cache;
buf->size_y = y;
}
ret = resize_scrollbuf(buf, y);
if (ret)
return ret;
buf->size_y = y;
/* Adjust x size by simply setting the new value */
buf->size_x = x;
@ -510,7 +525,7 @@ void kmscon_buffer_draw(struct kmscon_buffer *buf, struct kmscon_font *font)
line = iter;
iter = iter->next;
} else {
line = buf->current[k];
line = buf->scroll_buf[k];
k++;
}
@ -568,7 +583,7 @@ void kmscon_buffer_write(struct kmscon_buffer *buf, unsigned int x,
return;
}
line = buf->current[y];
line = buf->scroll_buf[y];
if (!line) {
ret = new_line(&line);
if (ret) {
@ -576,9 +591,9 @@ void kmscon_buffer_write(struct kmscon_buffer *buf, unsigned int x,
return;
}
buf->current[y] = line;
if (buf->fill <= y)
buf->fill = y + 1;
buf->scroll_buf[y] = line;
if (buf->scroll_fill <= y)
buf->scroll_fill = y + 1;
}
if (x >= line->size) {
@ -606,7 +621,7 @@ kmscon_symbol_t kmscon_buffer_read(struct kmscon_buffer *buf, unsigned int x,
return kmscon_symbol_default;
}
line = buf->current[y];
line = buf->scroll_buf[y];
if (!line)
return kmscon_symbol_default;
@ -631,14 +646,14 @@ void kmscon_buffer_newline(struct kmscon_buffer *buf)
return;
}
if (buf->fill >= buf->size_y) {
link_to_scrollback(buf, buf->current[0]);
memmove(buf->current, &buf->current[1],
if (buf->scroll_fill >= buf->size_y) {
link_to_scrollback(buf, buf->scroll_buf[0]);
memmove(buf->scroll_buf, &buf->scroll_buf[1],
(buf->size_y - 1) * sizeof(struct line*));
buf->current[buf->size_y - 1] = NULL;
buf->fill--;
buf->scroll_buf[buf->size_y - 1] = NULL;
buf->scroll_fill--;
}
buf->current[buf->fill] = nl;
buf->fill++;
buf->scroll_buf[buf->scroll_fill] = nl;
buf->scroll_fill++;
}