mirror of
https://github.com/labwc/labwc.git
synced 2025-11-03 09:01:51 -05:00
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
|
#ifndef __LAB_COMMON_SCALED_SCENE_BUFFER_H
|
||
|
|
#define __LAB_COMMON_SCALED_SCENE_BUFFER_H
|
||
|
|
|
||
|
|
#define LAB_SCALED_BUFFER_MAX_CACHE 2
|
||
|
|
|
||
|
|
struct wl_list;
|
||
|
|
struct wlr_buffer;
|
||
|
|
struct wl_listener;
|
||
|
|
struct wlr_scene_tree;
|
||
|
|
struct lab_data_buffer;
|
||
|
|
struct scaled_scene_buffer;
|
||
|
|
|
||
|
|
struct scaled_scene_buffer_impl {
|
||
|
|
/* Return a new buffer optimized for the new scale */
|
||
|
|
struct lab_data_buffer *(*create_buffer)
|
||
|
|
(struct scaled_scene_buffer *scaled_buffer, double scale);
|
||
|
|
/* Might be NULL or used for cleaning up */
|
||
|
|
void (*destroy)(struct scaled_scene_buffer *scaled_buffer);
|
||
|
|
};
|
||
|
|
|
||
|
|
struct scaled_scene_buffer {
|
||
|
|
struct wlr_scene_buffer *scene_buffer;
|
||
|
|
int width; /* unscaled, read only */
|
||
|
|
int height; /* unscaled, read only */
|
||
|
|
void *data; /* opaque user data */
|
||
|
|
|
||
|
|
/* Private */
|
||
|
|
double active_scale;
|
||
|
|
struct wl_list cache; /* struct scaled_buffer_cache_entry.link */
|
||
|
|
struct wl_listener destroy;
|
||
|
|
struct wl_listener output_enter;
|
||
|
|
struct wl_listener output_leave;
|
||
|
|
const struct scaled_scene_buffer_impl *impl;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Create an auto scaling buffer that creates a wlr_scene_buffer
|
||
|
|
* and subscribes to its output_enter and output_leave signals.
|
||
|
|
*
|
||
|
|
* If the maximal scale changes, it either sets an already existing buffer
|
||
|
|
* that was rendered for the current scale or - if there is none - calls
|
||
|
|
* implementation->create_buffer(self, scale) to get a new lab_data_buffer
|
||
|
|
* optimized for the new scale.
|
||
|
|
*
|
||
|
|
* Up to LAB_SCALED_BUFFER_MAX_CACHE (2) buffers are cached in an LRU fashion
|
||
|
|
* to handle the majority of use cases where a view is moved between no more
|
||
|
|
* than two different scales.
|
||
|
|
*
|
||
|
|
* scaled_scene_buffer will clean up automatically once the internal
|
||
|
|
* wlr_scene_buffer is being destroyed. If implementation->destroy is set
|
||
|
|
* it will also get called so a consumer of this API may clean up its own
|
||
|
|
* allocations.
|
||
|
|
*/
|
||
|
|
struct scaled_scene_buffer *scaled_scene_buffer_create(
|
||
|
|
struct wlr_scene_tree *parent,
|
||
|
|
const struct scaled_scene_buffer_impl *implementation);
|
||
|
|
|
||
|
|
/* Clear the cache of existing buffers, useful in case the content changes */
|
||
|
|
void scaled_scene_buffer_invalidate_cache(struct scaled_scene_buffer *self);
|
||
|
|
|
||
|
|
|
||
|
|
/* Private */
|
||
|
|
struct scaled_scene_buffer_cache_entry {
|
||
|
|
struct wl_list link; /* struct scaled_scene_buffer.cache */
|
||
|
|
struct wlr_buffer *buffer;
|
||
|
|
double scale;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* __LAB_COMMON_SCALED_SCENE_BUFFER_H */
|