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clutter/stage: Add API to paint to a custom target

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Either onto a framebuffer, or into a CPU memory buffer. The latter will
use an former API and then copy the result to CPU memory. The former
allocates an offscreen framebuffer, sets up the relevant framebuffer
matrices and paints part of the stage defined by the passed rectangle.

This will be used by a RecordArea screen cast API. The former to paint
directly onto PipeWire handled dma-buf framebuffers, and the latter for
PipeWire handled shared memory buffers.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1207
This commit is contained in:
Jonas Ådahl 2020-04-20 22:29:50 +02:00
parent e849667be6
commit b7bf42e778
2 changed files with 108 additions and 0 deletions
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17
clutter/clutter/clutter-mutter.h
View file

@ -48,6 +48,23 @@ void clutter_stage_capture_into (ClutterStage *stage,
cairo_rectangle_int_t *rect,
uint8_t *data);
CLUTTER_EXPORT
void clutter_stage_paint_to_framebuffer (ClutterStage *stage,
CoglFramebuffer *framebuffer,
const cairo_rectangle_int_t *rect,
float scale,
ClutterPaintFlag paint_flags);
CLUTTER_EXPORT
gboolean clutter_stage_paint_to_buffer (ClutterStage *stage,
const cairo_rectangle_int_t *rect,
float scale,
uint8_t *data,
int stride,
CoglPixelFormat format,
ClutterPaintFlag paint_flags,
GError **error);
CLUTTER_EXPORT
void clutter_stage_freeze_updates (ClutterStage *stage);

91
clutter/clutter/clutter-stage.c
View file

@ -4164,6 +4164,97 @@ clutter_stage_get_capture_final_size (ClutterStage *stage,
return TRUE;
}
void
clutter_stage_paint_to_framebuffer (ClutterStage *stage,
CoglFramebuffer *framebuffer,
const cairo_rectangle_int_t *rect,
float scale,
ClutterPaintFlag paint_flags)
{
ClutterStagePrivate *priv = stage->priv;
ClutterPaintContext *paint_context;
cairo_region_t *redraw_clip;
redraw_clip = cairo_region_create_rectangle (rect);
paint_context =
clutter_paint_context_new_for_framebuffer (framebuffer,
redraw_clip,
paint_flags);
cairo_region_destroy (redraw_clip);
cogl_framebuffer_push_matrix (framebuffer);
cogl_framebuffer_set_projection_matrix (framebuffer, &priv->projection);
cogl_framebuffer_set_viewport (framebuffer,
-(rect->x * scale),
-(rect->y * scale),
priv->viewport[2] * scale,
priv->viewport[3] * scale);
clutter_actor_paint (CLUTTER_ACTOR (stage), paint_context);
cogl_framebuffer_pop_matrix (framebuffer);
clutter_paint_context_destroy (paint_context);
}
gboolean
clutter_stage_paint_to_buffer (ClutterStage *stage,
const cairo_rectangle_int_t *rect,
float scale,
uint8_t *data,
int stride,
CoglPixelFormat format,
ClutterPaintFlag paint_flags,
GError **error)
{
ClutterBackend *clutter_backend = clutter_get_default_backend ();
CoglContext *cogl_context =
clutter_backend_get_cogl_context (clutter_backend);
int texture_width, texture_height;
CoglTexture2D *texture;
CoglOffscreen *offscreen;
CoglFramebuffer *framebuffer;
CoglBitmap *bitmap;
texture_width = (int) ceilf (rect->width * scale);
texture_height = (int) ceilf (rect->height * scale);
texture = cogl_texture_2d_new_with_size (cogl_context,
texture_width,
texture_height);
if (!texture)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to create %dx%d texture",
texture_width, texture_height);
return FALSE;
}
offscreen = cogl_offscreen_new_with_texture (COGL_TEXTURE (texture));
framebuffer = COGL_FRAMEBUFFER (offscreen);
cogl_object_unref (texture);
if (!cogl_framebuffer_allocate (framebuffer, error))
return FALSE;
clutter_stage_paint_to_framebuffer (stage, framebuffer,
rect, scale, paint_flags);
bitmap = cogl_bitmap_new_for_data (cogl_context,
texture_width, texture_height,
format,
stride,
data);
cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
0, 0,
COGL_READ_PIXELS_COLOR_BUFFER,
bitmap);
cogl_object_unref (bitmap);
cogl_object_unref (framebuffer);
return TRUE;
}
static void
capture_view_into (ClutterStage *stage,
gboolean paint,