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Add abstract scaled_scene_buffer implementation

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Consolatis 2022-06-13 21:32:12 +02:00 • committed by Johan Malm
parent f3a685155d
commit c3f07aacf0
3 changed files with 263 additions and 0 deletions
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include/common/scaled_scene_buffer.h Normal file
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/* 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 */