mutter/clutter/clutter/clutter-stage-view.c
Jonas Ådahl 63450d69d3 clutter: Add ability to scale stage views
This commit adds the ability to set a scale on a scale view. This will
cause the content in the stage view to be painted with the given scale,
while still keeping the configured layout on the stage. In effect, for
a stage view with scale 'n', this means the framebuffer of a given stage
will 'n' times larger, keeping the same size on the stage.

https://bugzilla.gnome.org/show_bug.cgi?id=777732
2017-04-07 22:30:48 +08:00

354 lines
10 KiB
C

/*
* Copyright (C) 2016 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "clutter-build-config.h"
#include "clutter/clutter-stage-view.h"
#include <cairo-gobject.h>
enum
{
PROP_0,
PROP_LAYOUT,
PROP_FRAMEBUFFER,
PROP_OFFSCREEN,
PROP_SCALE,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
typedef struct _ClutterStageViewPrivate
{
cairo_rectangle_int_t layout;
int scale;
CoglFramebuffer *framebuffer;
CoglOffscreen *offscreen;
CoglPipeline *pipeline;
guint dirty_viewport : 1;
guint dirty_projection : 1;
} ClutterStageViewPrivate;
G_DEFINE_TYPE_WITH_PRIVATE (ClutterStageView, clutter_stage_view, G_TYPE_OBJECT)
void
clutter_stage_view_get_layout (ClutterStageView *view,
cairo_rectangle_int_t *rect)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
*rect = priv->layout;
}
CoglFramebuffer *
clutter_stage_view_get_framebuffer (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
if (priv->offscreen)
return priv->offscreen;
else
return priv->framebuffer;
}
CoglFramebuffer *
clutter_stage_view_get_onscreen (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
return priv->framebuffer;
}
static void
clutter_stage_view_ensure_offscreen_blit_pipeline (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
ClutterStageViewClass *view_class =
CLUTTER_STAGE_VIEW_GET_CLASS (view);
g_assert (priv->offscreen != NULL);
if (priv->pipeline)
return;
priv->pipeline =
cogl_pipeline_new (cogl_framebuffer_get_context (priv->offscreen));
cogl_pipeline_set_layer_filters (priv->pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
cogl_pipeline_set_layer_texture (priv->pipeline, 0,
cogl_offscreen_get_texture (priv->offscreen));
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0,
COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE);
if (view_class->setup_offscreen_blit_pipeline)
view_class->setup_offscreen_blit_pipeline (view, priv->pipeline);
}
void
clutter_stage_view_invalidate_offscreen_blit_pipeline (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
g_clear_pointer (&priv->pipeline, cogl_object_unref);
}
void
clutter_stage_view_blit_offscreen (ClutterStageView *view,
const cairo_rectangle_int_t *rect)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
CoglMatrix matrix;
clutter_stage_view_ensure_offscreen_blit_pipeline (view);
cogl_framebuffer_push_matrix (priv->framebuffer);
/* Set transform so 0,0 is on the top left corner and 1,1 on
* the bottom right corner.
*/
cogl_matrix_init_identity (&matrix);
cogl_matrix_translate (&matrix, -1, 1, 0);
cogl_matrix_scale (&matrix, 2, -2, 0);
cogl_framebuffer_set_projection_matrix (priv->framebuffer, &matrix);
cogl_framebuffer_draw_rectangle (priv->framebuffer,
priv->pipeline,
0, 0, 1, 1);
cogl_framebuffer_pop_matrix (priv->framebuffer);
}
int
clutter_stage_view_get_scale (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
return priv->scale;
}
gboolean
clutter_stage_view_is_dirty_viewport (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
return priv->dirty_viewport;
}
void
clutter_stage_view_set_dirty_viewport (ClutterStageView *view,
gboolean dirty)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
priv->dirty_viewport = dirty;
}
gboolean
clutter_stage_view_is_dirty_projection (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
return priv->dirty_projection;
}
void
clutter_stage_view_set_dirty_projection (ClutterStageView *view,
gboolean dirty)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
priv->dirty_projection = dirty;
}
void
clutter_stage_view_get_offscreen_transformation_matrix (ClutterStageView *view,
CoglMatrix *matrix)
{
ClutterStageViewClass *view_class = CLUTTER_STAGE_VIEW_GET_CLASS (view);
view_class->get_offscreen_transformation_matrix (view, matrix);
}
void
clutter_stage_view_transform_to_onscreen (ClutterStageView *view,
gfloat *x,
gfloat *y)
{
gfloat z = 0, w = 1;
CoglMatrix matrix;
clutter_stage_view_get_offscreen_transformation_matrix (view, &matrix);
cogl_matrix_get_inverse (&matrix, &matrix);
cogl_matrix_transform_point (&matrix, x, y, &z, &w);
}
static void
clutter_stage_default_get_offscreen_transformation_matrix (ClutterStageView *view,
CoglMatrix *matrix)
{
cogl_matrix_init_identity (matrix);
}
static void
clutter_stage_view_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterStageView *view = CLUTTER_STAGE_VIEW (object);
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
switch (prop_id)
{
case PROP_LAYOUT:
g_value_set_boxed (value, &priv->layout);
break;
case PROP_FRAMEBUFFER:
g_value_set_boxed (value, priv->framebuffer);
break;
case PROP_OFFSCREEN:
g_value_set_boxed (value, priv->offscreen);
break;
case PROP_SCALE:
g_value_set_int (value, priv->scale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
clutter_stage_view_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterStageView *view = CLUTTER_STAGE_VIEW (object);
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
cairo_rectangle_int_t *layout;
switch (prop_id)
{
case PROP_LAYOUT:
layout = g_value_get_boxed (value);
priv->layout = *layout;
break;
case PROP_FRAMEBUFFER:
priv->framebuffer = g_value_dup_boxed (value);
break;
case PROP_OFFSCREEN:
priv->offscreen = g_value_dup_boxed (value);
break;
case PROP_SCALE:
priv->scale = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
clutter_stage_view_dispose (GObject *object)
{
ClutterStageView *view = CLUTTER_STAGE_VIEW (object);
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
g_clear_pointer (&priv->framebuffer, cogl_object_unref);
g_clear_pointer (&priv->offscreen, cogl_object_unref);
g_clear_pointer (&priv->pipeline, cogl_object_unref);
G_OBJECT_CLASS (clutter_stage_view_parent_class)->dispose (object);
}
static void
clutter_stage_view_init (ClutterStageView *view)
{
ClutterStageViewPrivate *priv =
clutter_stage_view_get_instance_private (view);
priv->dirty_viewport = TRUE;
priv->dirty_projection = TRUE;
priv->scale = 1;
}
static void
clutter_stage_view_class_init (ClutterStageViewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
klass->get_offscreen_transformation_matrix =
clutter_stage_default_get_offscreen_transformation_matrix;
object_class->get_property = clutter_stage_view_get_property;
object_class->set_property = clutter_stage_view_set_property;
object_class->dispose = clutter_stage_view_dispose;
obj_props[PROP_LAYOUT] =
g_param_spec_boxed ("layout",
"View layout",
"The view layout on the screen",
CAIRO_GOBJECT_TYPE_RECTANGLE_INT,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
obj_props[PROP_FRAMEBUFFER] =
g_param_spec_boxed ("framebuffer",
"View framebuffer",
"The front buffer of the view",
COGL_TYPE_HANDLE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
obj_props[PROP_OFFSCREEN] =
g_param_spec_boxed ("offscreen",
"Offscreen buffer",
"Framebuffer used as intermediate buffer",
COGL_TYPE_HANDLE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
obj_props[PROP_SCALE] =
g_param_spec_int ("scale",
"View scale",
"The view scale",
1, G_MAXINT, 1,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, PROP_LAST, obj_props);
}