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clutter/clutter/clutter-paint-nodes.c

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2011 Intel Corporation.
*
* 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/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-paint-nodes
* @Title: Paint Nodes
* @Short_Description: ClutterPaintNode implementations
*
* Clutter provides a set of predefined #ClutterPaintNode implementations
* that cover all the state changes available.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define CLUTTER_ENABLE_EXPERIMENTAL_API
#include "clutter-paint-node-private.h"
#include <pango/pango.h>
#include <cogl/cogl.h>
#include "clutter-actor-private.h"
#include "clutter-color.h"
#include "clutter-debug.h"
#include "clutter-private.h"
#include "clutter-paint-nodes.h"
static CoglPipeline *default_color_pipeline = NULL;
static CoglPipeline *default_texture_pipeline = NULL;
/*< private >
* _clutter_paint_node_init_types:
*
* Initializes the required types for ClutterPaintNode subclasses
*/
void
_clutter_paint_node_init_types (void)
{
CoglContext *ctx;
CoglColor cogl_color;
GType node_type G_GNUC_UNUSED;
if (G_LIKELY (default_color_pipeline != NULL))
return;
ctx = clutter_backend_get_cogl_context (clutter_get_default_backend ());
node_type = clutter_paint_node_get_type ();
cogl_color_init_from_4f (&cogl_color, 1.0, 1.0, 1.0, 1.0);
default_color_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_color (default_color_pipeline, &cogl_color);
default_texture_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_layer_null_texture (default_texture_pipeline, 0,
COGL_TEXTURE_TYPE_2D);
cogl_pipeline_set_color (default_texture_pipeline, &cogl_color);
cogl_pipeline_set_layer_wrap_mode (default_texture_pipeline, 0,
COGL_PIPELINE_WRAP_MODE_AUTOMATIC);
}
/*
* Root node, private
*
* any frame can only have a since RootNode instance for each
* top-level actor.
*/
#define clutter_root_node_get_type _clutter_root_node_get_type
typedef struct _ClutterRootNode ClutterRootNode;
typedef struct _ClutterPaintNodeClass ClutterRootNodeClass;
struct _ClutterRootNode
{
ClutterPaintNode parent_instance;
CoglFramebuffer *framebuffer;
CoglBufferBit clear_flags;
CoglColor clear_color;
};
G_DEFINE_TYPE (ClutterRootNode, clutter_root_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_root_node_pre_draw (ClutterPaintNode *node)
{
ClutterRootNode *rnode = (ClutterRootNode *) node;
cogl_framebuffer_clear (rnode->framebuffer,
rnode->clear_flags,
&rnode->clear_color);
return TRUE;
}
static void
clutter_root_node_post_draw (ClutterPaintNode *node)
{
}
static void
clutter_root_node_finalize (ClutterPaintNode *node)
{
ClutterRootNode *rnode = (ClutterRootNode *) node;
cogl_object_unref (rnode->framebuffer);
CLUTTER_PAINT_NODE_CLASS (clutter_root_node_parent_class)->finalize (node);
}
static CoglFramebuffer *
clutter_root_node_get_framebuffer (ClutterPaintNode *node)
{
ClutterRootNode *rnode = (ClutterRootNode *) node;
return rnode->framebuffer;
}
static void
clutter_root_node_class_init (ClutterRootNodeClass *klass)
{
ClutterPaintNodeClass *node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_root_node_pre_draw;
node_class->post_draw = clutter_root_node_post_draw;
node_class->finalize = clutter_root_node_finalize;
node_class->get_framebuffer = clutter_root_node_get_framebuffer;
}
static void
clutter_root_node_init (ClutterRootNode *self)
{
}
ClutterPaintNode *
_clutter_root_node_new (CoglFramebuffer *framebuffer,
const ClutterColor *clear_color,
CoglBufferBit clear_flags)
{
ClutterRootNode *res;
res = _clutter_paint_node_create (_clutter_root_node_get_type ());
cogl_color_init_from_4ub (&res->clear_color,
clear_color->red,
clear_color->green,
clear_color->blue,
clear_color->alpha);
cogl_color_premultiply (&res->clear_color);
if (G_LIKELY (framebuffer != NULL))
res->framebuffer = cogl_object_ref (framebuffer);
else
res->framebuffer = cogl_object_ref (cogl_get_draw_framebuffer ());
res->clear_flags = clear_flags;
return (ClutterPaintNode *) res;
}
/*
* Transform node
*
* A private PaintNode, that changes the modelview of its child
* nodes.
*/
#define clutter_transform_node_get_type _clutter_transform_node_get_type
typedef struct _ClutterTransformNode {
ClutterPaintNode parent_instance;
CoglMatrix modelview;
} ClutterTransformNode;
typedef struct _ClutterPaintNodeClass ClutterTransformNodeClass;
G_DEFINE_TYPE (ClutterTransformNode, clutter_transform_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_transform_node_pre_draw (ClutterPaintNode *node)
{
ClutterTransformNode *tnode = (ClutterTransformNode *) node;
CoglMatrix matrix;
cogl_push_matrix ();
cogl_get_modelview_matrix (&matrix);
cogl_matrix_multiply (&matrix, &matrix, &tnode->modelview);
cogl_set_modelview_matrix (&matrix);
return TRUE;
}
static void
clutter_transform_node_post_draw (ClutterPaintNode *node)
{
cogl_pop_matrix ();
}
static void
clutter_transform_node_class_init (ClutterTransformNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_transform_node_pre_draw;
node_class->post_draw = clutter_transform_node_post_draw;
}
static void
clutter_transform_node_init (ClutterTransformNode *self)
{
cogl_matrix_init_identity (&self->modelview);
}
ClutterPaintNode *
_clutter_transform_node_new (const CoglMatrix *modelview)
{
ClutterTransformNode *res;
res = _clutter_paint_node_create (_clutter_transform_node_get_type ());
if (modelview != NULL)
res->modelview = *modelview;
return (ClutterPaintNode *) res;
}
/*
* Dummy node, private
*
* an empty node, used temporarily until we can drop API compatibility,
* and we'll be able to build a full render tree for each frame.
*/
#define clutter_dummy_node_get_type _clutter_dummy_node_get_type
typedef struct _ClutterDummyNode ClutterDummyNode;
typedef struct _ClutterPaintNodeClass ClutterDummyNodeClass;
struct _ClutterDummyNode
{
ClutterPaintNode parent_instance;
ClutterActor *actor;
CoglFramebuffer *framebuffer;
};
G_DEFINE_TYPE (ClutterDummyNode, clutter_dummy_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_dummy_node_pre_draw (ClutterPaintNode *node)
{
return TRUE;
}
static JsonNode *
clutter_dummy_node_serialize (ClutterPaintNode *node)
{
ClutterDummyNode *dnode = (ClutterDummyNode *) node;
JsonBuilder *builder;
JsonNode *res;
if (dnode->actor == NULL)
return json_node_new (JSON_NODE_NULL);
builder = json_builder_new ();
json_builder_begin_object (builder);
json_builder_set_member_name (builder, "actor");
json_builder_add_string_value (builder, _clutter_actor_get_debug_name (dnode->actor));
json_builder_end_object (builder);
res = json_builder_get_root (builder);
g_object_unref (builder);
return res;
}
static CoglFramebuffer *
clutter_dummy_node_get_framebuffer (ClutterPaintNode *node)
{
ClutterDummyNode *dnode = (ClutterDummyNode *) node;
return dnode->framebuffer;
}
static void
clutter_dummy_node_class_init (ClutterDummyNodeClass *klass)
{
ClutterPaintNodeClass *node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_dummy_node_pre_draw;
node_class->serialize = clutter_dummy_node_serialize;
node_class->get_framebuffer = clutter_dummy_node_get_framebuffer;
}
static void
clutter_dummy_node_init (ClutterDummyNode *self)
{
}
ClutterPaintNode *
_clutter_dummy_node_new (ClutterActor *actor)
{
ClutterPaintNode *res;
ClutterDummyNode *dnode;
res = _clutter_paint_node_create (_clutter_dummy_node_get_type ());
dnode = (ClutterDummyNode *) res;
dnode->actor = actor;
dnode->framebuffer = _clutter_actor_get_active_framebuffer (actor);
return res;
}
/*
* Pipeline node
*/
struct _ClutterPipelineNode
{
ClutterPaintNode parent_instance;
CoglPipeline *pipeline;
};
/**
* ClutterPipelineNodeClass:
*
* The <structname>ClutterPipelineNodeClass</structname> structure is an opaque
* type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterPipelineNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterPipelineNode, clutter_pipeline_node, CLUTTER_TYPE_PAINT_NODE)
static void
clutter_pipeline_node_finalize (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
if (pnode->pipeline != NULL)
cogl_object_unref (pnode->pipeline);
CLUTTER_PAINT_NODE_CLASS (clutter_pipeline_node_parent_class)->finalize (node);
}
static gboolean
clutter_pipeline_node_pre_draw (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
if (node->operations != NULL &&
pnode->pipeline != NULL)
{
cogl_push_source (pnode->pipeline);
return TRUE;
}
return FALSE;
}
static void
clutter_pipeline_node_draw (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
CoglFramebuffer *fb;
guint i;
if (pnode->pipeline == NULL)
return;
if (node->operations == NULL)
return;
fb = clutter_paint_node_get_framebuffer (node);
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_INVALID:
break;
case PAINT_OP_TEX_RECT:
cogl_rectangle_with_texture_coords (op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3],
op->op.texrect[4],
op->op.texrect[5],
op->op.texrect[6],
op->op.texrect[7]);
break;
case PAINT_OP_PATH:
cogl_path_fill (op->op.path);
break;
case PAINT_OP_PRIMITIVE:
cogl_framebuffer_draw_primitive (fb,
pnode->pipeline,
op->op.primitive);
break;
}
}
}
static void
clutter_pipeline_node_post_draw (ClutterPaintNode *node)
{
cogl_pop_source ();
}
static JsonNode *
clutter_pipeline_node_serialize (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
JsonBuilder *builder;
CoglColor color;
JsonNode *res;
if (pnode->pipeline == NULL)
return json_node_new (JSON_NODE_NULL);
builder = json_builder_new ();
json_builder_begin_object (builder);
cogl_pipeline_get_color (pnode->pipeline, &color);
json_builder_set_member_name (builder, "color");
json_builder_begin_array (builder);
json_builder_add_double_value (builder, cogl_color_get_red (&color));
json_builder_add_double_value (builder, cogl_color_get_green (&color));
json_builder_add_double_value (builder, cogl_color_get_blue (&color));
json_builder_add_double_value (builder, cogl_color_get_alpha (&color));
json_builder_end_array (builder);
#if 0
json_builder_set_member_name (builder, "layers");
json_builder_begin_array (builder);
cogl_pipeline_foreach_layer (pnode->pipeline,
clutter_pipeline_node_serialize_layer,
builder);
json_builder_end_array (builder);
#endif
json_builder_end_object (builder);
res = json_builder_get_root (builder);
g_object_unref (builder);
return res;
}
static void
clutter_pipeline_node_class_init (ClutterPipelineNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_pipeline_node_pre_draw;
node_class->draw = clutter_pipeline_node_draw;
node_class->post_draw = clutter_pipeline_node_post_draw;
node_class->finalize = clutter_pipeline_node_finalize;
node_class->serialize = clutter_pipeline_node_serialize;
}
static void
clutter_pipeline_node_init (ClutterPipelineNode *self)
{
}
/**
* clutter_pipeline_node_new:
* @pipeline: (allow-none): a Cogl pipeline state object, or %NULL
*
* Creates a new #ClutterPaintNode that will use the @pipeline to
* paint its contents.
*
* This function will acquire a reference on the passed @pipeline,
* so it is safe to call cogl_object_unref() when it returns.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done.
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_pipeline_node_new (CoglPipeline *pipeline)
{
ClutterPipelineNode *res;
g_return_val_if_fail (pipeline == NULL || cogl_is_pipeline (pipeline), NULL);
res = _clutter_paint_node_create (CLUTTER_TYPE_PIPELINE_NODE);
if (pipeline != NULL)
res->pipeline = cogl_object_ref (pipeline);
return (ClutterPaintNode *) res;
}
/*
* Color node
*/
struct _ClutterColorNode
{
ClutterPipelineNode parent_instance;
};
/**
* ClutterColorNodeClass:
*
* The <structname>ClutterColorNodeClass</structname> structure is an
* opaque type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterColorNodeClass
{
ClutterPipelineNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterColorNode, clutter_color_node, CLUTTER_TYPE_PIPELINE_NODE)
static void
clutter_color_node_class_init (ClutterColorNodeClass *klass)
{
}
static void
clutter_color_node_init (ClutterColorNode *cnode)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (cnode);
g_assert (default_color_pipeline != NULL);
pnode->pipeline = cogl_pipeline_copy (default_color_pipeline);
}
/**
* clutter_color_node_new:
* @color: (allow-none): the color to paint, or %NULL
*
* Creates a new #ClutterPaintNode that will paint a solid color
* fill using @color.
*
* Return value: (transfer full): the newly created #ClutterPaintNode. Use
* clutter_paint_node_unref() when done
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_color_node_new (const ClutterColor *color)
{
ClutterPipelineNode *cnode;
cnode = _clutter_paint_node_create (CLUTTER_TYPE_COLOR_NODE);
if (color != NULL)
{
CoglColor cogl_color;
cogl_color_init_from_4ub (&cogl_color,
color->red,
color->green,
color->blue,
color->alpha);
cogl_color_premultiply (&cogl_color);
cogl_pipeline_set_color (cnode->pipeline, &cogl_color);
}
return (ClutterPaintNode *) cnode;
}
/*
* Texture node
*/
struct _ClutterTextureNode
{
ClutterPipelineNode parent_instance;
};
/**
* ClutterTextureNodeClass:
*
* The <structname>ClutterTextureNodeClass</structname> structure is an
* opaque type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterTextureNodeClass
{
ClutterPipelineNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterTextureNode, clutter_texture_node, CLUTTER_TYPE_PIPELINE_NODE)
static void
clutter_texture_node_class_init (ClutterTextureNodeClass *klass)
{
}
static void
clutter_texture_node_init (ClutterTextureNode *self)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (self);
g_assert (default_texture_pipeline != NULL);
pnode->pipeline = cogl_pipeline_copy (default_texture_pipeline);
}
static CoglPipelineFilter
clutter_scaling_filter_to_cogl_pipeline_filter (ClutterScalingFilter filter)
{
switch (filter)
{
case CLUTTER_SCALING_FILTER_NEAREST:
return COGL_PIPELINE_FILTER_NEAREST;
case CLUTTER_SCALING_FILTER_LINEAR:
return COGL_PIPELINE_FILTER_LINEAR;
case CLUTTER_SCALING_FILTER_TRILINEAR:
return COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR;
}
return COGL_PIPELINE_FILTER_LINEAR;
}
/**
* clutter_texture_node_new:
* @texture: a #CoglTexture
* @color: (allow-none): a #ClutterColor used for blending, or %NULL
* @min_filter: the minification filter for the texture
* @mag_filter: the magnification filter for the texture
*
* Creates a new #ClutterPaintNode that will paint the passed @texture.
*
* This function will take a reference on @texture, so it is safe to
* call cogl_object_unref() on @texture when it returns.
*
* The @color must not be pre-multiplied with its #ClutterColor.alpha
* channel value; if @color is %NULL, a fully opaque white color will
* be used for blending.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_texture_node_new (CoglTexture *texture,
const ClutterColor *color,
ClutterScalingFilter min_filter,
ClutterScalingFilter mag_filter)
{
ClutterPipelineNode *tnode;
CoglColor cogl_color;
CoglPipelineFilter min_f, mag_f;
g_return_val_if_fail (cogl_is_texture (texture), NULL);
tnode = _clutter_paint_node_create (CLUTTER_TYPE_TEXTURE_NODE);
cogl_pipeline_set_layer_texture (tnode->pipeline, 0, texture);
min_f = clutter_scaling_filter_to_cogl_pipeline_filter (min_filter);
mag_f = clutter_scaling_filter_to_cogl_pipeline_filter (mag_filter);
cogl_pipeline_set_layer_filters (tnode->pipeline, 0, min_f, mag_f);
if (color != NULL)
{
cogl_color_init_from_4ub (&cogl_color,
color->red,
color->green,
color->blue,
color->alpha);
cogl_color_premultiply (&cogl_color);
}
else
cogl_color_init_from_4ub (&cogl_color, 255, 255, 255, 255);
cogl_pipeline_set_color (tnode->pipeline, &cogl_color);
return (ClutterPaintNode *) tnode;
}
/*
* Text node
*/
struct _ClutterTextNode
{
ClutterPaintNode parent_instance;
PangoLayout *layout;
CoglColor color;
};
/**
* ClutterTextNodeClass:
*
* The <structname>ClutterTextNodeClass</structname> structure is an opaque
* type whose contents cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterTextNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterTextNode, clutter_text_node, CLUTTER_TYPE_PAINT_NODE)
static void
clutter_text_node_finalize (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
if (tnode->layout != NULL)
g_object_unref (tnode->layout);
CLUTTER_PAINT_NODE_CLASS (clutter_text_node_parent_class)->finalize (node);
}
static gboolean
clutter_text_node_pre_draw (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
return tnode->layout != NULL;
}
static void
clutter_text_node_draw (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
PangoRectangle extents;
CoglFramebuffer *fb;
guint i;
if (node->operations == NULL)
return;
fb = clutter_paint_node_get_framebuffer (node);
pango_layout_get_pixel_extents (tnode->layout, NULL, &extents);
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
float op_width, op_height;
gboolean clipped = FALSE;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_TEX_RECT:
op_width = op->op.texrect[2] - op->op.texrect[0];
op_height = op->op.texrect[3] - op->op.texrect[1];
/* if the primitive size was smaller than the layout,
* we clip the layout when drawin, to avoid spilling
* it out
*/
if (extents.width > op_width ||
extents.height > op_height)
{
cogl_framebuffer_push_rectangle_clip (fb,
op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3]);
clipped = TRUE;
}
cogl_pango_render_layout (tnode->layout,
op->op.texrect[0],
op->op.texrect[1],
&tnode->color,
0);
if (clipped)
cogl_framebuffer_pop_clip (fb);
break;
case PAINT_OP_PATH:
case PAINT_OP_PRIMITIVE:
case PAINT_OP_INVALID:
break;
}
}
}
static JsonNode *
clutter_text_node_serialize (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
JsonBuilder *builder;
JsonNode *res;
builder = json_builder_new ();
json_builder_begin_object (builder);
json_builder_set_member_name (builder, "layout");
if (pango_layout_get_character_count (tnode->layout) > 12)
{
const char *text = pango_layout_get_text (tnode->layout);
char *str;
str = g_strndup (text, 12);
json_builder_add_string_value (builder, str);
g_free (str);
}
else
json_builder_add_string_value (builder, pango_layout_get_text (tnode->layout));
json_builder_set_member_name (builder, "color");
json_builder_begin_array (builder);
json_builder_add_double_value (builder, cogl_color_get_red (&tnode->color));
json_builder_add_double_value (builder, cogl_color_get_green (&tnode->color));
json_builder_add_double_value (builder, cogl_color_get_blue (&tnode->color));
json_builder_add_double_value (builder, cogl_color_get_alpha (&tnode->color));
json_builder_end_array (builder);
json_builder_end_object (builder);
res = json_builder_get_root (builder);
g_object_unref (builder);
return res;
}
static void
clutter_text_node_class_init (ClutterTextNodeClass *klass)
{
ClutterPaintNodeClass *node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_text_node_pre_draw;
node_class->draw = clutter_text_node_draw;
node_class->finalize = clutter_text_node_finalize;
node_class->serialize = clutter_text_node_serialize;
}
static void
clutter_text_node_init (ClutterTextNode *self)
{
cogl_color_init_from_4f (&self->color, 0.0, 0.0, 0.0, 1.0);
}
/**
* clutter_text_node_new:
* @layout: (allow-none): a #PangoLayout, or %NULL
* @color: (allow-none): the color used to paint the layout,
* or %NULL
*
* Creates a new #ClutterPaintNode that will paint a #PangoLayout
* with the given color.
*
* This function takes a reference on the passed @layout, so it
* is safe to call g_object_unref() after it returns.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_text_node_new (PangoLayout *layout,
const ClutterColor *color)
{
ClutterTextNode *res;
g_return_val_if_fail (layout == NULL || PANGO_IS_LAYOUT (layout), NULL);
res = _clutter_paint_node_create (CLUTTER_TYPE_TEXT_NODE);
if (layout != NULL)
res->layout = g_object_ref (layout);
if (color != NULL)
{
cogl_color_init_from_4ub (&res->color,
color->red,
color->green,
color->blue,
color->alpha);
}
return (ClutterPaintNode *) res;
}
/*
* Clip node
*/
struct _ClutterClipNode
{
ClutterPaintNode parent_instance;
};
/**
* ClutterClipNodeClass:
*
* The <structname>ClutterClipNodeClass</structname> structure is an opaque
* type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterClipNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterClipNode, clutter_clip_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_clip_node_pre_draw (ClutterPaintNode *node)
{
gboolean retval = FALSE;
CoglFramebuffer *fb;
guint i;
if (node->operations == NULL)
return FALSE;
fb = clutter_paint_node_get_framebuffer (node);
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_TEX_RECT:
cogl_framebuffer_push_rectangle_clip (fb,
op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3]);
retval = TRUE;
break;
case PAINT_OP_PATH:
cogl_framebuffer_push_path_clip (fb, op->op.path);
retval = TRUE;
break;
case PAINT_OP_PRIMITIVE:
case PAINT_OP_INVALID:
break;
}
}
return retval;
}
static void
clutter_clip_node_post_draw (ClutterPaintNode *node)
{
CoglFramebuffer *fb;
guint i;
if (node->operations == NULL)
return;
fb = clutter_paint_node_get_framebuffer (node);
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_PATH:
case PAINT_OP_TEX_RECT:
cogl_framebuffer_pop_clip (fb);
break;
case PAINT_OP_PRIMITIVE:
case PAINT_OP_INVALID:
break;
}
}
}
static void
clutter_clip_node_class_init (ClutterClipNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_clip_node_pre_draw;
node_class->post_draw = clutter_clip_node_post_draw;
}
static void
clutter_clip_node_init (ClutterClipNode *self)
{
}
/**
* clutter_clip_node_new:
*
* Creates a new #ClutterPaintNode that will clip its child
* nodes to the 2D regions added to it.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done.
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_clip_node_new (void)
{
return _clutter_paint_node_create (CLUTTER_TYPE_CLIP_NODE);
}
/*
* ClutterLayerNode (private)
*/
#define clutter_layer_node_get_type _clutter_layer_node_get_type
struct _ClutterLayerNode
{
ClutterPaintNode parent_instance;
cairo_rectangle_t viewport;
CoglMatrix projection;
float fbo_width;
float fbo_height;
CoglPipeline *state;
CoglFramebuffer *offscreen;
CoglTexture *texture;
guint8 opacity;
};
struct _ClutterLayerNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterLayerNode, clutter_layer_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_layer_node_pre_draw (ClutterPaintNode *node)
{
ClutterLayerNode *lnode = (ClutterLayerNode *) node;
CoglMatrix matrix;
/* if we were unable to create an offscreen buffer for this node, then
* we simply ignore it
*/
if (lnode->offscreen == NULL)
return FALSE;
/* if no geometry was submitted for this node then we simply ignore it */
if (node->operations == NULL)
return FALSE;
/* copy the same modelview from the current framebuffer to the one we
* are going to use
*/
cogl_get_modelview_matrix (&matrix);
cogl_push_framebuffer (lnode->offscreen);
cogl_framebuffer_set_modelview_matrix (lnode->offscreen, &matrix);
cogl_framebuffer_set_viewport (lnode->offscreen,
lnode->viewport.x,
lnode->viewport.y,
lnode->viewport.width,
lnode->viewport.height);
cogl_framebuffer_set_projection_matrix (lnode->offscreen,
&lnode->projection);
/* clear out the target framebuffer */
cogl_framebuffer_clear4f (lnode->offscreen,
COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_DEPTH,
0.f, 0.f, 0.f, 0.f);
cogl_push_matrix ();
/* every draw operation after this point will happen an offscreen
* framebuffer
*/
return TRUE;
}
static void
clutter_layer_node_post_draw (ClutterPaintNode *node)
{
ClutterLayerNode *lnode = CLUTTER_LAYER_NODE (node);
CoglFramebuffer *fb;
guint i;
/* switch to the previous framebuffer */
cogl_pop_matrix ();
cogl_pop_framebuffer ();
fb = cogl_get_draw_framebuffer ();
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_INVALID:
break;
case PAINT_OP_TEX_RECT:
/* now we need to paint the texture */
cogl_push_source (lnode->state);
cogl_rectangle_with_texture_coords (op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3],
op->op.texrect[4],
op->op.texrect[5],
op->op.texrect[6],
op->op.texrect[7]);
cogl_pop_source ();
break;
case PAINT_OP_PATH:
cogl_push_source (lnode->state);
cogl_path_fill (op->op.path);
cogl_pop_source ();
break;
case PAINT_OP_PRIMITIVE:
cogl_framebuffer_draw_primitive (fb, lnode->state, op->op.primitive);
break;
}
}
}
static void
clutter_layer_node_finalize (ClutterPaintNode *node)
{
ClutterLayerNode *lnode = CLUTTER_LAYER_NODE (node);
if (lnode->state != NULL)
cogl_object_unref (lnode->state);
if (lnode->offscreen != NULL)
cogl_object_unref (lnode->offscreen);
CLUTTER_PAINT_NODE_CLASS (clutter_layer_node_parent_class)->finalize (node);
}
static void
clutter_layer_node_class_init (ClutterLayerNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_layer_node_pre_draw;
node_class->post_draw = clutter_layer_node_post_draw;
node_class->finalize = clutter_layer_node_finalize;
}
static void
clutter_layer_node_init (ClutterLayerNode *self)
{
cogl_matrix_init_identity (&self->projection);
}
/*
* clutter_layer_node_new:
* @projection: the projection matrix to use to set up the layer
* @viewport: (type cairo.Rectangle): the viewport to use to set up the layer
* @width: the width of the layer
* @height: the height of the layer
* @opacity: the opacity to be used when drawing the layer
*
* Creates a new #ClutterLayerNode.
*
* All children of this node will be painted inside a separate
* framebuffer; the framebuffer will then be painted using the
* given @opacity.
*
* Return value: (transfer full): the newly created #ClutterLayerNode.
* Use clutter_paint_node_unref() when done.
*
* Since: 1.10
*/
ClutterPaintNode *
_clutter_layer_node_new (const CoglMatrix *projection,
const cairo_rectangle_t *viewport,
float width,
float height,
guint8 opacity)
{
ClutterLayerNode *res;
CoglColor color;
res = _clutter_paint_node_create (CLUTTER_TYPE_LAYER_NODE);
res->projection = *projection;
res->viewport = *viewport;
res->fbo_width = width;
res->fbo_height = height;
res->opacity = opacity;
/* the texture backing the FBO */
res->texture = cogl_texture_new_with_size (MAX (res->fbo_width, 1),
MAX (res->fbo_height, 1),
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE);
res->offscreen = COGL_FRAMEBUFFER (cogl_offscreen_new_to_texture (res->texture));
if (res->offscreen == NULL)
{
g_critical ("%s: Unable to create an offscreen buffer", G_STRLOC);
cogl_object_unref (res->texture);
res->texture = NULL;
goto out;
}
cogl_color_init_from_4ub (&color, opacity, opacity, opacity, opacity);
/* the pipeline used to paint the texture; we use nearest
* interpolation filters because the texture is always
* going to be painted at a 1:1 texel:pixel ratio
*/
res->state = cogl_pipeline_copy (default_texture_pipeline);
cogl_pipeline_set_layer_filters (res->state, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
cogl_pipeline_set_layer_texture (res->state, 0, res->texture);
cogl_pipeline_set_color (res->state, &color);
cogl_object_unref (res->texture);
out:
return (ClutterPaintNode *) res;
}
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