[PATCH 1/2 v3] screenshooter: Grab pixel data directly before buffer swap
Scott Moreau
oreaus at gmail.com
Fri Apr 20 02:31:12 PDT 2012
---
clients/screenshot.c | 17 ++++++++-
protocol/screenshooter.xml | 2 +
src/compositor-drm.c | 18 +--------
src/compositor-wayland.c | 18 +--------
src/compositor-x11.c | 18 +--------
src/compositor.c | 15 ++++++++
src/compositor.h | 13 ++++++-
src/screenshooter.c | 86 +++++++++++++++++++++++++++++++------------
8 files changed, 113 insertions(+), 74 deletions(-)
diff --git a/clients/screenshot.c b/clients/screenshot.c
index 086ddd9..da22423 100644
--- a/clients/screenshot.c
+++ b/clients/screenshot.c
@@ -41,6 +41,7 @@
static struct wl_shm *shm;
static struct screenshooter *screenshooter;
static struct wl_list output_list;
+int buffer_copy_done;
struct screenshooter_output {
struct wl_output *output;
@@ -94,6 +95,16 @@ static const struct wl_output_listener output_listener = {
};
static void
+screenshot_done(void *data, struct screenshooter *screenshooter)
+{
+ buffer_copy_done = 1;
+}
+
+static const struct screenshooter_listener screenshooter_listener = {
+ screenshot_done
+};
+
+static void
handle_global(struct wl_display *display, uint32_t id,
const char *interface, uint32_t version, void *data)
{
@@ -188,6 +199,8 @@ int main(int argc, char *argv[])
return -1;
}
+ screenshooter_add_listener(screenshooter, &screenshooter_listener, screenshooter);
+
wl_list_for_each(output, &output_list, link) {
width = MAX(width, output->offset_x + output->width);
height = MAX(height, output->offset_y + output->height);
@@ -197,10 +210,12 @@ int main(int argc, char *argv[])
wl_list_for_each_safe(output, next, &output_list, link) {
screenshooter_shoot(screenshooter, output->output, buffer);
+ buffer_copy_done = 0;
+ while (!buffer_copy_done)
+ wl_display_roundtrip(display);
free(output);
}
- wl_display_roundtrip(display);
write_png(width, height, data);
diff --git a/protocol/screenshooter.xml b/protocol/screenshooter.xml
index 1487c6d..76e3c85 100644
--- a/protocol/screenshooter.xml
+++ b/protocol/screenshooter.xml
@@ -5,6 +5,8 @@
<arg name="output" type="object" interface="wl_output"/>
<arg name="buffer" type="object" interface="wl_buffer"/>
</request>
+ <event name="done">
+ </event>
</interface>
</protocol>
diff --git a/src/compositor-drm.c b/src/compositor-drm.c
index 837da8c..dcd5e99 100644
--- a/src/compositor-drm.c
+++ b/src/compositor-drm.c
@@ -215,6 +215,8 @@ drm_output_render(struct drm_output *output, pixman_region32_t *damage)
wl_list_for_each_reverse(surface, &compositor->base.surface_list, link)
weston_surface_draw(surface, &output->base, damage);
+ weston_output_do_read_pixels(&output->base);
+
eglSwapBuffers(compositor->base.display, output->egl_surface);
output->next_bo = gbm_surface_lock_front_buffer(output->surface);
if (!output->next_bo) {
@@ -1190,21 +1192,6 @@ drm_set_dpms(struct weston_output *output_base, enum dpms_enum level)
drmModeFreeConnector(connector);
}
-static void
-drm_output_read_pixels(struct weston_output *output_base, void *data)
-{
- struct drm_output *output = (struct drm_output *) output_base;
- struct drm_compositor *compositor =
- (struct drm_compositor *) output->base.compositor;
-
- eglMakeCurrent(compositor->base.display, output->egl_surface,
- output->egl_surface, compositor->base.context);
-
- glReadPixels(0, 0, output_base->current->width,
- output_base->current->height,
- compositor->base.read_format, GL_UNSIGNED_BYTE, data);
-}
-
static int
create_output_for_connector(struct drm_compositor *ec,
drmModeRes *resources,
@@ -1313,7 +1300,6 @@ create_output_for_connector(struct drm_compositor *ec,
output->base.repaint = drm_output_repaint;
output->base.destroy = drm_output_destroy;
output->base.assign_planes = drm_assign_planes;
- output->base.read_pixels = drm_output_read_pixels;
output->base.set_dpms = drm_set_dpms;
output->base.switch_mode = drm_output_switch_mode;
diff --git a/src/compositor-wayland.c b/src/compositor-wayland.c
index afd9121..c01dd17 100644
--- a/src/compositor-wayland.c
+++ b/src/compositor-wayland.c
@@ -355,6 +355,8 @@ wayland_output_repaint(struct weston_output *output_base,
wl_list_for_each_reverse(surface, &compositor->base.surface_list, link)
weston_surface_draw(surface, &output->base, damage);
+ weston_output_do_read_pixels(&output->base);
+
draw_border(output);
eglSwapBuffers(compositor->base.display, output->egl_surface);
@@ -377,21 +379,6 @@ wayland_output_destroy(struct weston_output *output_base)
return;
}
-static void
-wayland_output_read_pixels(struct weston_output *output_base, void *data)
-{
- struct wayland_output *output = (struct wayland_output *) output_base;
- struct wayland_compositor *compositor =
- (struct wayland_compositor *) output->base.compositor;
-
- eglMakeCurrent(compositor->base.display, output->egl_surface,
- output->egl_surface, compositor->base.context);
-
- glReadPixels(0, 0, output_base->current->width,
- output_base->current->height,
- compositor->base.read_format, GL_UNSIGNED_BYTE, data);
-}
-
static int
wayland_compositor_create_output(struct wayland_compositor *c,
int width, int height)
@@ -460,7 +447,6 @@ wayland_compositor_create_output(struct wayland_compositor *c,
output->base.repaint = wayland_output_repaint;
output->base.destroy = wayland_output_destroy;
output->base.assign_planes = NULL;
- output->base.read_pixels = wayland_output_read_pixels;
output->base.set_backlight = NULL;
output->base.set_dpms = NULL;
output->base.switch_mode = NULL;
diff --git a/src/compositor-x11.c b/src/compositor-x11.c
index b910831..6d9bb0e 100644
--- a/src/compositor-x11.c
+++ b/src/compositor-x11.c
@@ -212,6 +212,8 @@ x11_output_repaint(struct weston_output *output_base,
wl_list_for_each_reverse(surface, &compositor->base.surface_list, link)
weston_surface_draw(surface, &output->base, damage);
+ weston_output_do_read_pixels(&output->base);
+
eglSwapBuffers(compositor->base.display, output->egl_surface);
wl_event_source_timer_update(output->finish_frame_timer, 10);
@@ -344,21 +346,6 @@ x11_output_set_icon(struct x11_compositor *c,
pixman_image_unref(image);
}
-static void
-x11_output_read_pixels(struct weston_output *output_base, void *data)
-{
- struct x11_output *output = (struct x11_output *) output_base;
- struct x11_compositor *compositor =
- (struct x11_compositor *) output->base.compositor;
-
- eglMakeCurrent(compositor->base.display, output->egl_surface,
- output->egl_surface, compositor->base.context);
-
- glReadPixels(0, 0, output_base->current->width,
- output_base->current->height,
- compositor->base.read_format, GL_UNSIGNED_BYTE, data);
-}
-
static int
x11_compositor_create_output(struct x11_compositor *c, int x, int y,
int width, int height, int fullscreen)
@@ -470,7 +457,6 @@ x11_compositor_create_output(struct x11_compositor *c, int x, int y,
output->base.repaint = x11_output_repaint;
output->base.destroy = x11_output_destroy;
output->base.assign_planes = NULL;
- output->base.read_pixels = x11_output_read_pixels;
output->base.set_backlight = NULL;
output->base.set_dpms = NULL;
output->base.switch_mode = NULL;
diff --git a/src/compositor.c b/src/compositor.c
index abf5ce9..ca6a803 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -2355,6 +2355,7 @@ weston_output_init(struct weston_output *output, struct weston_compositor *c,
output->mm_width = width;
output->mm_height = height;
output->dirty = 1;
+ wl_list_init(&output->read_pixels_list);
output->zoom.active = 0;
output->zoom.increment = 0.05;
@@ -2374,6 +2375,20 @@ weston_output_init(struct weston_output *output, struct weston_compositor *c,
output, bind_output);
}
+WL_EXPORT void
+weston_output_do_read_pixels(struct weston_output *output)
+{
+ struct weston_read_pixels *r, *next;
+
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ wl_list_for_each_safe(r, next, &output->read_pixels_list, link) {
+ glReadPixels(r->x, r->y, r->width, r->height,
+ output->compositor->read_format,
+ GL_UNSIGNED_BYTE, r->data);
+ r->done(r, output);
+ }
+}
+
static void
compositor_bind(struct wl_client *client,
void *data, uint32_t version, uint32_t id)
diff --git a/src/compositor.h b/src/compositor.h
index b19900b..61cafc1 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -44,6 +44,7 @@ struct weston_transform {
struct weston_surface;
struct weston_input_device;
+struct weston_output;
struct weston_mode {
uint32_t flags;
@@ -72,6 +73,14 @@ enum dpms_enum {
WESTON_DPMS_OFF
};
+struct weston_read_pixels {
+ void *data;
+ int x, y, width, height;
+ void (*done)(struct weston_read_pixels *read_pixels,
+ struct weston_output *output);
+ struct wl_list link;
+};
+
struct weston_output {
struct wl_list link;
struct wl_global *global;
@@ -87,6 +96,7 @@ struct weston_output {
int repaint_scheduled;
struct weston_output_zoom zoom;
int dirty;
+ struct wl_list read_pixels_list;
char *make, *model;
uint32_t subpixel;
@@ -99,7 +109,6 @@ struct weston_output {
pixman_region32_t *damage);
void (*destroy)(struct weston_output *output);
void (*assign_planes)(struct weston_output *output);
- void (*read_pixels)(struct weston_output *output, void *data);
int (*switch_mode)(struct weston_output *output, struct weston_mode *mode);
/* backlight values are on 0-255 range, where higher is brighter */
@@ -413,6 +422,8 @@ weston_output_finish_frame(struct weston_output *output, int msecs);
void
weston_output_damage(struct weston_output *output);
void
+weston_output_do_read_pixels(struct weston_output *output);
+void
weston_compositor_repick(struct weston_compositor *compositor);
void
weston_compositor_schedule_repaint(struct weston_compositor *compositor);
diff --git a/src/screenshooter.c b/src/screenshooter.c
index b4b341b..87f1a9a 100644
--- a/src/screenshooter.c
+++ b/src/screenshooter.c
@@ -36,6 +36,12 @@ struct screenshooter {
struct wl_listener destroy_listener;
};
+struct screenshooter_read_pixels {
+ struct weston_read_pixels base;
+ struct wl_buffer *buffer;
+ struct wl_resource *resource;
+};
+
static void
copy_bgra_yflip(uint8_t *dst, uint8_t *src, int height,
int dst_stride, int src_stride)
@@ -82,15 +88,52 @@ copy_rgba_yflip(uint8_t *dst, uint8_t *src, int height,
}
static void
+screenshooter_read_pixels_done(struct weston_read_pixels *base,
+ struct weston_output *output)
+{
+ struct screenshooter_read_pixels *r =
+ (struct screenshooter_read_pixels *) base;
+ int32_t buffer_stride, output_stride;
+ uint8_t *d, *s;
+
+ buffer_stride = wl_shm_buffer_get_stride(r->buffer);
+ output_stride = output->current->width * 4;
+
+ d = wl_shm_buffer_get_data(r->buffer) +
+ output->y * buffer_stride + output->x * 4;
+ s = r->base.data + output_stride * (output->current->height - 1);
+
+ switch (output->compositor->read_format) {
+ case GL_BGRA_EXT:
+ copy_bgra_yflip(d, s, output->current->height,
+ buffer_stride, output_stride);
+ break;
+ case GL_RGBA:
+ copy_rgba_yflip(d, s, output->current->height,
+ buffer_stride, output_stride);
+ break;
+ default:
+ break;
+ }
+
+ wl_list_remove(&r->base.link);
+
+ screenshooter_send_done(r->resource);
+ free(r->base.data);
+ free(r);
+
+}
+
+static void
screenshooter_shoot(struct wl_client *client,
struct wl_resource *resource,
struct wl_resource *output_resource,
struct wl_resource *buffer_resource)
{
struct weston_output *output = output_resource->data;
+ struct screenshooter_read_pixels *r;
struct wl_buffer *buffer = buffer_resource->data;
- uint8_t *tmp, *d, *s;
- int32_t buffer_stride, output_stride;
+ int32_t output_stride;
if (!wl_buffer_is_shm(buffer))
return;
@@ -99,35 +142,30 @@ screenshooter_shoot(struct wl_client *client,
buffer->height < output->current->height)
return;
- buffer_stride = wl_shm_buffer_get_stride(buffer);
- output_stride = output->current->width * 4;
- tmp = malloc(output_stride * output->current->height);
- if (tmp == NULL) {
+ r = malloc(sizeof *r);
+ if (r == NULL) {
wl_resource_post_no_memory(resource);
return;
}
- glPixelStorei(GL_PACK_ALIGNMENT, 1);
- output->read_pixels(output, tmp);
-
- d = wl_shm_buffer_get_data(buffer) + output->y * buffer_stride +
- output->x * 4;
- s = tmp + output_stride * (output->current->height - 1);
+ r->base.x = 0;
+ r->base.y = 0;
+ r->base.width = output->current->width;
+ r->base.height = output->current->height;
+ r->base.done = screenshooter_read_pixels_done;
+ r->buffer = buffer;
+ r->resource = resource;
+ output_stride = output->current->width * 4;
+ r->base.data = malloc(output_stride * output->current->height);
- switch (output->compositor->read_format) {
- case GL_BGRA_EXT:
- copy_bgra_yflip(d, s, output->current->height,
- buffer_stride, output_stride);
- break;
- case GL_RGBA:
- copy_rgba_yflip(d, s, output->current->height,
- buffer_stride, output_stride);
- break;
- default:
- break;
+ if (r->base.data == NULL) {
+ free(r);
+ wl_resource_post_no_memory(resource);
+ return;
}
- free(tmp);
+ wl_list_insert(output->read_pixels_list.prev, &r->base.link);
+ weston_compositor_schedule_repaint(output->compositor);
}
struct screenshooter_interface screenshooter_implementation = {
--
1.7.4.1
More information about the wayland-devel
mailing list