wlroots-hyprland/types/wlr_buffer.c

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#include <assert.h>
#include <stdlib.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_buffer.h>
#include <wlr/types/wlr_linux_dmabuf_v1.h>
#include <wlr/util/log.h>
#include "render/pixel_format.h"
#include "render/wlr_texture.h"
#include "types/wlr_buffer.h"
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#include "util/signal.h"
void wlr_buffer_init(struct wlr_buffer *buffer,
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const struct wlr_buffer_impl *impl, int width, int height) {
assert(impl->destroy);
if (impl->begin_data_ptr_access || impl->end_data_ptr_access) {
assert(impl->begin_data_ptr_access && impl->end_data_ptr_access);
}
buffer->impl = impl;
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buffer->width = width;
buffer->height = height;
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wl_signal_init(&buffer->events.destroy);
wl_signal_init(&buffer->events.release);
}
static void buffer_consider_destroy(struct wlr_buffer *buffer) {
if (!buffer->dropped || buffer->n_locks > 0) {
return;
}
assert(!buffer->accessing_data_ptr);
wlr_signal_emit_safe(&buffer->events.destroy, NULL);
buffer->impl->destroy(buffer);
}
void wlr_buffer_drop(struct wlr_buffer *buffer) {
if (buffer == NULL) {
return;
}
assert(!buffer->dropped);
buffer->dropped = true;
buffer_consider_destroy(buffer);
}
struct wlr_buffer *wlr_buffer_lock(struct wlr_buffer *buffer) {
buffer->n_locks++;
return buffer;
}
void wlr_buffer_unlock(struct wlr_buffer *buffer) {
if (buffer == NULL) {
return;
}
assert(buffer->n_locks > 0);
buffer->n_locks--;
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if (buffer->n_locks == 0) {
wl_signal_emit(&buffer->events.release, NULL);
}
buffer_consider_destroy(buffer);
}
bool wlr_buffer_get_dmabuf(struct wlr_buffer *buffer,
struct wlr_dmabuf_attributes *attribs) {
if (!buffer->impl->get_dmabuf) {
return false;
}
return buffer->impl->get_dmabuf(buffer, attribs);
}
bool buffer_begin_data_ptr_access(struct wlr_buffer *buffer, void **data,
uint32_t *format, size_t *stride) {
assert(!buffer->accessing_data_ptr);
if (!buffer->impl->begin_data_ptr_access) {
return false;
}
if (!buffer->impl->begin_data_ptr_access(buffer, data, format, stride)) {
return false;
}
buffer->accessing_data_ptr = true;
return true;
}
void buffer_end_data_ptr_access(struct wlr_buffer *buffer) {
assert(buffer->accessing_data_ptr);
buffer->impl->end_data_ptr_access(buffer);
buffer->accessing_data_ptr = false;
}
bool wlr_buffer_get_shm(struct wlr_buffer *buffer,
struct wlr_shm_attributes *attribs) {
if (!buffer->impl->get_shm) {
return false;
}
return buffer->impl->get_shm(buffer, attribs);
}
bool wlr_resource_is_buffer(struct wl_resource *resource) {
return strcmp(wl_resource_get_class(resource), wl_buffer_interface.name) == 0;
}
bool wlr_resource_get_buffer_size(struct wl_resource *resource,
struct wlr_renderer *renderer, int *width, int *height) {
assert(wlr_resource_is_buffer(resource));
struct wl_shm_buffer *shm_buf = wl_shm_buffer_get(resource);
if (shm_buf != NULL) {
*width = wl_shm_buffer_get_width(shm_buf);
*height = wl_shm_buffer_get_height(shm_buf);
} else if (wlr_renderer_resource_is_wl_drm_buffer(renderer,
resource)) {
wlr_renderer_wl_drm_buffer_get_size(renderer, resource,
width, height);
} else if (wlr_dmabuf_v1_resource_is_buffer(resource)) {
struct wlr_dmabuf_v1_buffer *dmabuf =
wlr_dmabuf_v1_buffer_from_buffer_resource(resource);
*width = dmabuf->attributes.width;
*height = dmabuf->attributes.height;
} else {
*width = *height = 0;
return false;
}
return true;
}
static const struct wlr_buffer_impl client_buffer_impl;
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struct wlr_client_buffer *wlr_client_buffer_get(struct wlr_buffer *buffer) {
if (buffer->impl != &client_buffer_impl) {
return NULL;
}
return (struct wlr_client_buffer *)buffer;
}
static struct wlr_client_buffer *client_buffer_from_buffer(
struct wlr_buffer *buffer) {
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struct wlr_client_buffer *client_buffer = wlr_client_buffer_get(buffer);
assert(client_buffer != NULL);
return client_buffer;
}
static void client_buffer_destroy(struct wlr_buffer *_buffer) {
struct wlr_client_buffer *buffer = client_buffer_from_buffer(_buffer);
if (!buffer->resource_released && buffer->resource != NULL) {
wl_buffer_send_release(buffer->resource);
}
wl_list_remove(&buffer->resource_destroy.link);
wlr_texture_destroy(buffer->texture);
free(buffer);
}
static bool client_buffer_get_dmabuf(struct wlr_buffer *_buffer,
struct wlr_dmabuf_attributes *attribs) {
struct wlr_client_buffer *buffer = client_buffer_from_buffer(_buffer);
if (buffer->resource == NULL) {
return false;
}
struct wl_resource *buffer_resource = buffer->resource;
if (!wlr_dmabuf_v1_resource_is_buffer(buffer_resource)) {
return false;
}
struct wlr_dmabuf_v1_buffer *dmabuf_buffer =
wlr_dmabuf_v1_buffer_from_buffer_resource(buffer_resource);
memcpy(attribs, &dmabuf_buffer->attributes,
sizeof(struct wlr_dmabuf_attributes));
return true;
}
static const struct wlr_buffer_impl client_buffer_impl = {
.destroy = client_buffer_destroy,
.get_dmabuf = client_buffer_get_dmabuf,
};
static void client_buffer_resource_handle_destroy(struct wl_listener *listener,
void *data) {
struct wlr_client_buffer *buffer =
wl_container_of(listener, buffer, resource_destroy);
wl_list_remove(&buffer->resource_destroy.link);
wl_list_init(&buffer->resource_destroy.link);
buffer->resource = NULL;
// At this point, if the wl_buffer comes from linux-dmabuf or wl_drm, we
// still haven't released it (ie. we'll read it in the future) but the
// client destroyed it. Reading the texture itself should be fine because
// we still hold a reference to the DMA-BUF via the texture. However the
// client could decide to re-use the same DMA-BUF for something else, in
// which case we'll read garbage. We decide to accept this risk.
}
static void client_buffer_handle_release(struct wl_listener *listener,
void *data) {
struct wlr_client_buffer *buffer =
wl_container_of(listener, buffer, release);
if (!buffer->resource_released && buffer->resource != NULL) {
wl_buffer_send_release(buffer->resource);
buffer->resource_released = true;
}
}
struct wlr_client_buffer *wlr_client_buffer_import(
struct wlr_renderer *renderer, struct wl_resource *resource) {
assert(wlr_resource_is_buffer(resource));
struct wlr_texture *texture = NULL;
bool resource_released = false;
if (wl_shm_buffer_get(resource) != NULL) {
struct wlr_shm_client_buffer *shm_client_buffer =
shm_client_buffer_create(resource);
if (shm_client_buffer == NULL) {
wlr_log(WLR_ERROR, "Failed to create shm client buffer");
return NULL;
}
// Ensure the buffer will be released before being destroyed
wlr_buffer_lock(&shm_client_buffer->base);
wlr_buffer_drop(&shm_client_buffer->base);
texture = wlr_texture_from_buffer(renderer, &shm_client_buffer->base);
// The renderer should've locked the buffer by now if necessary
wlr_buffer_unlock(&shm_client_buffer->base);
// The renderer is responsible for releasing the buffer when
// appropriate
resource_released = true;
} else if (wlr_renderer_resource_is_wl_drm_buffer(renderer, resource)) {
texture = wlr_texture_from_wl_drm(renderer, resource);
} else if (wlr_dmabuf_v1_resource_is_buffer(resource)) {
struct wlr_dmabuf_v1_buffer *dmabuf =
wlr_dmabuf_v1_buffer_from_buffer_resource(resource);
texture = wlr_texture_from_buffer(renderer, &dmabuf->base);
// The renderer is responsible for releasing the buffer when
// appropriate
resource_released = true;
} else {
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wlr_log(WLR_ERROR, "Cannot upload texture: unknown buffer type");
// Instead of just logging the error, also disconnect the client with a
// fatal protocol error so that it's clear something went wrong.
wl_resource_post_error(resource, 0, "unknown buffer type");
return NULL;
}
if (texture == NULL) {
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wlr_log(WLR_ERROR, "Failed to upload texture");
wl_buffer_send_release(resource);
return NULL;
}
struct wlr_client_buffer *buffer =
calloc(1, sizeof(struct wlr_client_buffer));
if (buffer == NULL) {
wlr_texture_destroy(texture);
wl_resource_post_no_memory(resource);
return NULL;
}
wlr_buffer_init(&buffer->base, &client_buffer_impl,
texture->width, texture->height);
buffer->resource = resource;
buffer->texture = texture;
buffer->resource_released = resource_released;
wl_resource_add_destroy_listener(resource, &buffer->resource_destroy);
buffer->resource_destroy.notify = client_buffer_resource_handle_destroy;
buffer->release.notify = client_buffer_handle_release;
wl_signal_add(&buffer->base.events.release, &buffer->release);
// Ensure the buffer will be released before being destroyed
wlr_buffer_lock(&buffer->base);
wlr_buffer_drop(&buffer->base);
return buffer;
}
struct wlr_client_buffer *wlr_client_buffer_apply_damage(
struct wlr_client_buffer *buffer, struct wl_resource *resource,
pixman_region32_t *damage) {
assert(wlr_resource_is_buffer(resource));
if (buffer->base.n_locks > 1) {
// Someone else still has a reference to the buffer
return NULL;
}
struct wl_shm_buffer *shm_buf = wl_shm_buffer_get(resource);
struct wl_shm_buffer *old_shm_buf = wl_shm_buffer_get(buffer->resource);
if (shm_buf == NULL || old_shm_buf == NULL) {
// Uploading only damaged regions only works for wl_shm buffers and
// mutable textures (created from wl_shm buffer)
return NULL;
}
enum wl_shm_format new_fmt = wl_shm_buffer_get_format(shm_buf);
enum wl_shm_format old_fmt = wl_shm_buffer_get_format(old_shm_buf);
if (new_fmt != old_fmt) {
// Uploading to textures can't change the format
return NULL;
}
int32_t stride = wl_shm_buffer_get_stride(shm_buf);
int32_t width = wl_shm_buffer_get_width(shm_buf);
int32_t height = wl_shm_buffer_get_height(shm_buf);
if ((uint32_t)width != buffer->texture->width ||
(uint32_t)height != buffer->texture->height) {
return NULL;
}
wl_shm_buffer_begin_access(shm_buf);
void *data = wl_shm_buffer_get_data(shm_buf);
int n;
pixman_box32_t *rects = pixman_region32_rectangles(damage, &n);
for (int i = 0; i < n; ++i) {
pixman_box32_t *r = &rects[i];
if (!wlr_texture_write_pixels(buffer->texture, stride,
r->x2 - r->x1, r->y2 - r->y1, r->x1, r->y1,
r->x1, r->y1, data)) {
wl_shm_buffer_end_access(shm_buf);
return NULL;
}
}
wl_shm_buffer_end_access(shm_buf);
// We have uploaded the data, we don't need to access the wl_buffer
// anymore
wl_buffer_send_release(resource);
wl_list_remove(&buffer->resource_destroy.link);
wl_resource_add_destroy_listener(resource, &buffer->resource_destroy);
buffer->resource_destroy.notify = client_buffer_resource_handle_destroy;
buffer->resource = resource;
buffer->resource_released = true;
return buffer;
}
static const struct wlr_buffer_impl shm_client_buffer_impl;
static struct wlr_shm_client_buffer *shm_client_buffer_from_buffer(
struct wlr_buffer *buffer) {
assert(buffer->impl == &shm_client_buffer_impl);
return (struct wlr_shm_client_buffer *)buffer;
}
static void shm_client_buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct wlr_shm_client_buffer *buffer =
shm_client_buffer_from_buffer(wlr_buffer);
wl_list_remove(&buffer->resource_destroy.link);
wl_list_remove(&buffer->release.link);
if (buffer->saved_shm_pool != NULL) {
wl_shm_pool_unref(buffer->saved_shm_pool);
}
free(buffer);
}
static bool shm_client_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
void **data, uint32_t *format, size_t *stride) {
struct wlr_shm_client_buffer *buffer =
shm_client_buffer_from_buffer(wlr_buffer);
*format = buffer->format;
*stride = buffer->stride;
if (buffer->shm_buffer != NULL) {
*data = wl_shm_buffer_get_data(buffer->shm_buffer);
wl_shm_buffer_begin_access(buffer->shm_buffer);
} else {
*data = buffer->saved_data;
}
return true;
}
static void shm_client_buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
struct wlr_shm_client_buffer *buffer =
shm_client_buffer_from_buffer(wlr_buffer);
if (buffer->shm_buffer != NULL) {
wl_shm_buffer_end_access(buffer->shm_buffer);
}
}
static const struct wlr_buffer_impl shm_client_buffer_impl = {
.destroy = shm_client_buffer_destroy,
.begin_data_ptr_access = shm_client_buffer_begin_data_ptr_access,
.end_data_ptr_access = shm_client_buffer_end_data_ptr_access,
};
static void shm_client_buffer_resource_handle_destroy(
struct wl_listener *listener, void *data) {
struct wlr_shm_client_buffer *buffer =
wl_container_of(listener, buffer, resource_destroy);
// In order to still be able to access the shared memory region, we need to
// keep a reference to the wl_shm_pool
buffer->saved_shm_pool = wl_shm_buffer_ref_pool(buffer->shm_buffer);
buffer->saved_data = wl_shm_buffer_get_data(buffer->shm_buffer);
// The wl_shm_buffer destroys itself with the wl_resource
buffer->resource = NULL;
buffer->shm_buffer = NULL;
wl_list_remove(&buffer->resource_destroy.link);
wl_list_init(&buffer->resource_destroy.link);
}
static void shm_client_buffer_handle_release(struct wl_listener *listener,
void *data) {
struct wlr_shm_client_buffer *buffer =
wl_container_of(listener, buffer, release);
if (buffer->resource != NULL) {
wl_buffer_send_release(buffer->resource);
}
}
struct wlr_shm_client_buffer *shm_client_buffer_create(
struct wl_resource *resource) {
struct wl_shm_buffer *shm_buffer = wl_shm_buffer_get(resource);
assert(shm_buffer != NULL);
int32_t width = wl_shm_buffer_get_width(shm_buffer);
int32_t height = wl_shm_buffer_get_height(shm_buffer);
struct wlr_shm_client_buffer *buffer = calloc(1, sizeof(*buffer));
if (buffer == NULL) {
return NULL;
}
wlr_buffer_init(&buffer->base, &shm_client_buffer_impl, width, height);
buffer->resource = resource;
buffer->shm_buffer = shm_buffer;
enum wl_shm_format wl_shm_format = wl_shm_buffer_get_format(shm_buffer);
buffer->format = convert_wl_shm_format_to_drm(wl_shm_format);
buffer->stride = wl_shm_buffer_get_stride(shm_buffer);
buffer->resource_destroy.notify = shm_client_buffer_resource_handle_destroy;
wl_resource_add_destroy_listener(resource, &buffer->resource_destroy);
buffer->release.notify = shm_client_buffer_handle_release;
wl_signal_add(&buffer->base.events.release, &buffer->release);
return buffer;
}