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window-actor: Implement MetaScreenCastWindow interface

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Implements the `MetaScreenCastWindow` interface for screen-cast
`RecordWindow` mode.

`meta_window_actor_capture_into()` implementation is still pretty crude
and doesn't take into account subsurfaces and O-R windows so menus,
popups and other tooltips won't show in the capture.

This is left as a future improvement for now.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/306
(cherry picked from commit 931934511c)
This commit is contained in:
Olivier Fourdan 2018-12-04 16:29:47 +01:00 committed by Ray Strode
parent c94ee761af
commit acca2962f1
1 changed files with 131 additions and 1 deletions
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132
src/compositor/meta-window-actor.c
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@ -24,6 +24,7 @@
#include <meta/meta-shadow-factory.h>
#include "backends/meta-backend-private.h"
#include "backends/meta-screen-cast-window.h"
#include "clutter/clutter-mutter.h"
#include "compositor-private.h"
#include "meta-shaped-texture-private.h"
@ -188,8 +189,11 @@ static void do_send_frame_timings (MetaWindowActor *self,
static void cullable_iface_init (MetaCullableInterface *iface);
static void screen_cast_window_iface_init (MetaScreenCastWindowInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaWindowActor, meta_window_actor, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init)
G_IMPLEMENT_INTERFACE (META_TYPE_SCREEN_CAST_WINDOW, screen_cast_window_iface_init));
static void
frame_data_free (FrameData *frame)
@ -2181,3 +2185,129 @@ meta_window_actor_from_window (MetaWindow *window)
{
return META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
}
static void
meta_window_actor_get_buffer_bounds (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (screen_cast_window);
ClutterActor *clutter_actor;
clutter_actor = CLUTTER_ACTOR (meta_window_actor_get_texture (window_actor));
bounds->x = 0;
bounds->y = 0;
bounds->width = (int) clutter_actor_get_width (clutter_actor);
bounds->height = (int) clutter_actor_get_height (clutter_actor);
}
static void
meta_window_actor_get_frame_bounds (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (screen_cast_window);
MetaWindow *window;
MetaShapedTexture *stex;
MetaRectangle buffer_rect;
MetaRectangle frame_rect;
double scale_x, scale_y;
stex = meta_surface_actor_get_texture (window_actor->priv->surface);
clutter_actor_get_scale (CLUTTER_ACTOR (stex), &scale_x, &scale_y);
window = window_actor->priv->window;
meta_window_get_buffer_rect (window, &buffer_rect);
meta_window_get_frame_rect (window, &frame_rect);
bounds->x = (int) floor ((frame_rect.x - buffer_rect.x) / scale_x);
bounds->y = (int) floor ((frame_rect.y - buffer_rect.y) / scale_y);
bounds->width = (int) ceil (frame_rect.width / scale_x);
bounds->height = (int) ceil (frame_rect.height / scale_y);
}
static void
meta_window_actor_transform_relative_position (MetaScreenCastWindow *screen_cast_window,
double x,
double y,
double *x_out,
double *y_out)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (screen_cast_window);
MetaShapedTexture *stex;
MetaRectangle bounds;
ClutterVertex v1 = { 0.f, }, v2 = { 0.f, };
meta_window_actor_get_frame_bounds (screen_cast_window, &bounds);
v1.x = CLAMP ((float) x,
bounds.x,
bounds.x + bounds.width);
v1.y = CLAMP ((float) y,
bounds.y,
bounds.y + bounds.height);
stex = meta_surface_actor_get_texture (window_actor->priv->surface);
clutter_actor_apply_transform_to_point (CLUTTER_ACTOR (stex), &v1, &v2);
*x_out = (double) v2.x;
*y_out = (double) v2.y;
}
static void
meta_window_actor_capture_into (MetaScreenCastWindow *screen_cast_window,
MetaRectangle *bounds,
uint8_t *data)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (screen_cast_window);
cairo_surface_t *image;
MetaRectangle clip_rect;
uint8_t *cr_data;
int cr_stride;
int bpp = 4;
if (meta_window_actor_is_destroyed (window_actor))
return;
clip_rect = *bounds;
image = meta_surface_actor_get_image (window_actor->priv->surface, &clip_rect);
cr_data = cairo_image_surface_get_data (image);
cr_stride = cairo_image_surface_get_stride (image);
if (clip_rect.width < bounds->width || clip_rect.height < bounds->height)
{
uint8_t *src, *dst;
src = cr_data;
dst = data;
for (int i = 0; i < clip_rect.height; i++)
{
memcpy (dst, src, cr_stride);
if (clip_rect.width < bounds->width)
memset (dst + cr_stride, 0, (bounds->width * bpp) - cr_stride);
src += cr_stride;
dst += bounds->width * bpp;
}
for (int i = clip_rect.height; i < bounds->height; i++)
{
memset (dst, 0, bounds->width * bpp);
dst += bounds->width * bpp;
}
}
else
{
memcpy (data, cr_data, clip_rect.height * cr_stride);
}
cairo_surface_destroy (image);
}
static void
screen_cast_window_iface_init (MetaScreenCastWindowInterface *iface)
{
iface->get_buffer_bounds = meta_window_actor_get_buffer_bounds;
iface->get_frame_bounds = meta_window_actor_get_frame_bounds;
iface->transform_relative_position = meta_window_actor_transform_relative_position;
iface->capture_into = meta_window_actor_capture_into;
}