emersion
7 years ago
commit
57548b557a
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#ifndef WLR_TYPES_WLR_BUFFER_H
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#define WLR_TYPES_WLR_BUFFER_H
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#include <pixman.h>
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#include <wayland-server.h>
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/**
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* A client buffer.
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*/
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struct wlr_buffer {
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/**
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* The buffer resource, if any. Will be NULL if the client destroys it.
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*/
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struct wl_resource *resource;
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/**
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* The buffer's texture, if any. A buffer will not have a texture if the
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* client destroys the buffer before it has been released.
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*/
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struct wlr_texture *texture;
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bool released;
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size_t n_refs;
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struct wl_listener resource_destroy;
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};
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struct wlr_renderer;
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/**
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* Check if a resource is a wl_buffer resource.
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*/
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bool wlr_resource_is_buffer(struct wl_resource *resource);
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/**
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* Get the size of a wl_buffer resource.
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*/
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bool wlr_buffer_get_resource_size(struct wl_resource *resource,
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struct wlr_renderer *renderer, int *width, int *height);
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/**
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* Upload a buffer to the GPU and reference it.
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*/
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struct wlr_buffer *wlr_buffer_create(struct wlr_renderer *renderer,
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struct wl_resource *resource);
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/**
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* Reference the buffer.
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*/
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struct wlr_buffer *wlr_buffer_ref(struct wlr_buffer *buffer);
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/**
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* Unreference the buffer. After this call, `buffer` may not be accessed
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* anymore.
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*/
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void wlr_buffer_unref(struct wlr_buffer *buffer);
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/**
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* Try to update the buffer's content. On success, returns the updated buffer
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* and destroys the provided `buffer`. On error, `buffer` is intact and NULL is
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* returned.
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*
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* Fails if there's more than one reference to the buffer or if the texture
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* isn't mutable.
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*/
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struct wlr_buffer *wlr_buffer_apply_damage(struct wlr_buffer *buffer,
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struct wl_resource *resource, pixman_region32_t *damage);
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#endif
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@ -0,0 +1,193 @@
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#include <assert.h>
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#include <stdlib.h>
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#include <wlr/types/wlr_buffer.h>
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#include <wlr/types/wlr_linux_dmabuf.h>
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#include <wlr/render/wlr_renderer.h>
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#include <wlr/util/log.h>
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bool wlr_resource_is_buffer(struct wl_resource *resource) {
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return strcmp(wl_resource_get_class(resource), wl_buffer_interface.name) == 0;
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}
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bool wlr_buffer_get_resource_size(struct wl_resource *resource,
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struct wlr_renderer *renderer, int *width, int *height) {
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assert(wlr_resource_is_buffer(resource));
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struct wl_shm_buffer *shm_buf = wl_shm_buffer_get(resource);
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if (shm_buf != NULL) {
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*width = wl_shm_buffer_get_width(shm_buf);
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*height = wl_shm_buffer_get_height(shm_buf);
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} else if (wlr_renderer_resource_is_wl_drm_buffer(renderer,
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resource)) {
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wlr_renderer_wl_drm_buffer_get_size(renderer, resource,
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width, height);
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} else if (wlr_dmabuf_resource_is_buffer(resource)) {
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struct wlr_dmabuf_buffer *dmabuf =
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wlr_dmabuf_buffer_from_buffer_resource(resource);
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*width = dmabuf->attributes.width;
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*height = dmabuf->attributes.height;
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} else {
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*width = *height = 0;
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return false;
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}
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return true;
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}
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static void buffer_resource_handle_destroy(struct wl_listener *listener,
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void *data) {
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struct wlr_buffer *buffer =
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wl_container_of(listener, buffer, resource_destroy);
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wl_list_remove(&buffer->resource_destroy.link);
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wl_list_init(&buffer->resource_destroy.link);
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buffer->resource = NULL;
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// At this point, if the wl_buffer comes from linux-dmabuf or wl_drm, we
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// still haven't released it (ie. we'll read it in the future) but the
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// client destroyed it. Reading the texture itself should be fine because
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// we still hold a reference to the DMA-BUF via the texture. However the
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// client could decide to re-use the same DMA-BUF for something else, in
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// which case we'll read garbage. We decide to accept this risk.
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}
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struct wlr_buffer *wlr_buffer_create(struct wlr_renderer *renderer,
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struct wl_resource *resource) {
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assert(wlr_resource_is_buffer(resource));
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struct wlr_texture *texture = NULL;
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bool released = false;
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struct wl_shm_buffer *shm_buf = wl_shm_buffer_get(resource);
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if (shm_buf != NULL) {
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enum wl_shm_format fmt = wl_shm_buffer_get_format(shm_buf);
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int32_t stride = wl_shm_buffer_get_stride(shm_buf);
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int32_t width = wl_shm_buffer_get_width(shm_buf);
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int32_t height = wl_shm_buffer_get_height(shm_buf);
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wl_shm_buffer_begin_access(shm_buf);
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void *data = wl_shm_buffer_get_data(shm_buf);
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texture = wlr_texture_from_pixels(renderer, fmt, stride,
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width, height, data);
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wl_shm_buffer_end_access(shm_buf);
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// We have uploaded the data, we don't need to access the wl_buffer
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// anymore
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wl_buffer_send_release(resource);
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released = true;
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} else if (wlr_renderer_resource_is_wl_drm_buffer(renderer, resource)) {
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texture = wlr_texture_from_wl_drm(renderer, resource);
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} else if (wlr_dmabuf_resource_is_buffer(resource)) {
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struct wlr_dmabuf_buffer *dmabuf =
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wlr_dmabuf_buffer_from_buffer_resource(resource);
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texture = wlr_texture_from_dmabuf(renderer, &dmabuf->attributes);
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// We have imported the DMA-BUF, but we need to prevent the client from
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// re-using the same DMA-BUF for the next frames, so we don't release
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// the buffer yet.
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} else {
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wlr_log(L_ERROR, "Cannot upload texture: unknown buffer type");
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return NULL;
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}
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if (texture == NULL) {
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wlr_log(L_ERROR, "Failed to upload texture");
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return NULL;
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}
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struct wlr_buffer *buffer = calloc(1, sizeof(struct wlr_buffer));
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if (buffer == NULL) {
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wlr_texture_destroy(texture);
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return NULL;
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}
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buffer->resource = resource;
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buffer->texture = texture;
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buffer->released = released;
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buffer->n_refs = 1;
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wl_resource_add_destroy_listener(resource, &buffer->resource_destroy);
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buffer->resource_destroy.notify = buffer_resource_handle_destroy;
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return buffer;
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}
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struct wlr_buffer *wlr_buffer_ref(struct wlr_buffer *buffer) {
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buffer->n_refs++;
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return buffer;
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}
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void wlr_buffer_unref(struct wlr_buffer *buffer) {
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if (buffer == NULL) {
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return;
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}
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assert(buffer->n_refs > 0);
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buffer->n_refs--;
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if (buffer->n_refs > 0) {
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return;
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}
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if (!buffer->released && buffer->resource != NULL) {
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wl_buffer_send_release(buffer->resource);
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}
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wl_list_remove(&buffer->resource_destroy.link);
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wlr_texture_destroy(buffer->texture);
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free(buffer);
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}
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struct wlr_buffer *wlr_buffer_apply_damage(struct wlr_buffer *buffer,
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struct wl_resource *resource, pixman_region32_t *damage) {
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assert(wlr_resource_is_buffer(resource));
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if (buffer->n_refs > 1) {
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// Someone else still has a reference to the buffer
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return NULL;
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}
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struct wl_shm_buffer *shm_buf = wl_shm_buffer_get(resource);
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if (shm_buf == NULL) {
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// Uploading only damaged regions only works for wl_shm buffers
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return NULL;
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}
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enum wl_shm_format fmt = wl_shm_buffer_get_format(shm_buf);
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int32_t stride = wl_shm_buffer_get_stride(shm_buf);
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int32_t width = wl_shm_buffer_get_width(shm_buf);
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int32_t height = wl_shm_buffer_get_height(shm_buf);
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int32_t texture_width, texture_height;
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wlr_texture_get_size(buffer->texture, &texture_width, &texture_height);
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if (width != texture_width || height != texture_height) {
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return NULL;
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}
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wl_shm_buffer_begin_access(shm_buf);
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void *data = wl_shm_buffer_get_data(shm_buf);
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int n;
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pixman_box32_t *rects = pixman_region32_rectangles(damage, &n);
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for (int i = 0; i < n; ++i) {
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pixman_box32_t *r = &rects[i];
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if (!wlr_texture_write_pixels(buffer->texture, fmt, stride,
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r->x2 - r->x1, r->y2 - r->y1, r->x1, r->y1,
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r->x1, r->y1, data)) {
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wl_shm_buffer_end_access(shm_buf);
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return NULL;
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}
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}
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wl_shm_buffer_end_access(shm_buf);
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// We have uploaded the data, we don't need to access the wl_buffer
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// anymore
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wl_buffer_send_release(resource);
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wl_list_remove(&buffer->resource_destroy.link);
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wl_resource_add_destroy_listener(resource, &buffer->resource_destroy);
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buffer->resource_destroy.notify = buffer_resource_handle_destroy;
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buffer->resource = resource;
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buffer->released = true;
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return buffer;
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}
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