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mutter/clutter/clutter-cairo-texture.c
Emmanuele Bassi 4909ecc71e gtk-doc: Fixes for the API references
2010-11-08 16:01:19 +00:00

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/*
* Clutter
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By: Emmanuele Bassi <ebassi@linux.intel.com>
* Matthew Allum <mallum@o-hand.com>
* Chris Lord <chris@o-hand.com>
* Iain Holmes <iain@o-hand.com>
* Neil Roberts <neil@linux.intel.com>
*
* Copyright (C) 2008, 2009, 2010 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/>.
*/
/**
* SECTION:clutter-cairo-texture
* @short_description: Texture with Cairo integration
*
* #ClutterCairoTexture is a #ClutterTexture that displays the contents
* of a Cairo context. The #ClutterCairoTexture actor will create a
* Cairo image surface which will then be uploaded to a GL texture when
* needed.
*
* #ClutterCairoTexture will provide a #cairo_t context by using the
* clutter_cairo_texture_create() and clutter_cairo_texture_create_region()
* functions; you can use the Cairo API to draw on the context and then
* call cairo_destroy() when done.
*
* As soon as the context is destroyed with cairo_destroy(), the contents
* of the surface will be uploaded into the #ClutterCairoTexture actor:
*
* |[
* cairo_t *cr;
*
* cr = clutter_cairo_texture_create (CLUTTER_CAIRO_TEXTURE (texture));
*
* /&ast; draw on the context &ast;/
*
* cairo_destroy (cr);
* ]|
*
* Although a new #cairo_t is created each time you call
* clutter_cairo_texture_create() or
* clutter_cairo_texture_create_region(), it uses the same
* #cairo_surface_t each time. You can call
* clutter_cairo_texture_clear() to erase the contents between calls.
*
* <warning><para>Note that you should never use the code above inside the
* #ClutterActor::paint or #ClutterActor::pick virtual functions or
* signal handlers because it will lead to performance
* degradation.</para></warning>
*
* <note><para>Since #ClutterCairoTexture uses a Cairo image surface
* internally all the drawing operations will be performed in
* software and not using hardware acceleration. This can lead to
* performance degradation if the contents of the texture change
* frequently.</para></note>
*
* #ClutterCairoTexture is available since Clutter 1.0.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <cairo-gobject.h>
#include "clutter-cairo-texture.h"
#include "clutter-actor-private.h"
#include "clutter-debug.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
G_DEFINE_TYPE (ClutterCairoTexture,
clutter_cairo_texture,
CLUTTER_TYPE_TEXTURE);
enum
{
PROP_0,
PROP_SURFACE_WIDTH,
PROP_SURFACE_HEIGHT,
PROP_LAST
};
enum
{
CREATE_SURFACE,
LAST_SIGNAL
};
static GParamSpec *obj_props[PROP_LAST] = { NULL, };
static guint cairo_signals[LAST_SIGNAL] = { 0, };
#ifdef CLUTTER_ENABLE_DEBUG
#define clutter_warn_if_paint_fail(obj) G_STMT_START { \
if (CLUTTER_ACTOR_IN_PAINT (obj)) { \
g_warning ("%s should not be called during the paint sequence " \
"of a ClutterCairoTexture as it will likely cause " \
"performance issues.", G_STRFUNC); \
} } G_STMT_END
#else
#define clutter_warn_if_paint_fail(obj) /* void */
#endif /* CLUTTER_ENABLE_DEBUG */
#define CLUTTER_CAIRO_TEXTURE_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_CAIRO_TEXTURE, ClutterCairoTexturePrivate))
/* Cairo stores the data in native byte order as ARGB but Cogl's pixel
formats specify the actual byte order. Therefore we need to use a
different format depending on the architecture */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define CLUTTER_CAIRO_TEXTURE_PIXEL_FORMAT COGL_PIXEL_FORMAT_BGRA_8888_PRE
#else
#define CLUTTER_CAIRO_TEXTURE_PIXEL_FORMAT COGL_PIXEL_FORMAT_ARGB_8888_PRE
#endif
struct _ClutterCairoTexturePrivate
{
cairo_surface_t *cr_surface;
gint surface_width;
gint surface_height;
guint width;
guint height;
};
typedef struct {
ClutterCairoTexture *cairo;
cairo_rectangle_int_t rect;
} ClutterCairoTextureContext;
static const cairo_user_data_key_t clutter_cairo_texture_context_key;
static void
clutter_cairo_texture_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterCairoTexturePrivate *priv;
priv = CLUTTER_CAIRO_TEXTURE (object)->priv;
switch (prop_id)
{
case PROP_SURFACE_WIDTH:
priv->width = g_value_get_uint (value);
break;
case PROP_SURFACE_HEIGHT:
priv->height = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_cairo_texture_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterCairoTexturePrivate *priv;
priv = CLUTTER_CAIRO_TEXTURE (object)->priv;
switch (prop_id)
{
case PROP_SURFACE_WIDTH:
g_value_set_uint (value, priv->width);
break;
case PROP_SURFACE_HEIGHT:
g_value_set_uint (value, priv->height);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_cairo_texture_finalize (GObject *object)
{
ClutterCairoTexturePrivate *priv = CLUTTER_CAIRO_TEXTURE (object)->priv;
if (priv->cr_surface != NULL)
{
cairo_surface_t *surface = priv->cr_surface;
priv->cr_surface = NULL;
cairo_surface_finish (surface);
cairo_surface_destroy (surface);
}
G_OBJECT_CLASS (clutter_cairo_texture_parent_class)->finalize (object);
}
static cairo_surface_t *
get_surface (ClutterCairoTexture *self)
{
ClutterCairoTexturePrivate *priv = self->priv;
if (priv->cr_surface == NULL)
{
g_signal_emit (self, cairo_signals[CREATE_SURFACE], 0,
priv->width,
priv->height,
&priv->cr_surface);
}
return priv->cr_surface;
}
static inline void
clutter_cairo_texture_surface_resize_internal (ClutterCairoTexture *cairo)
{
ClutterCairoTexturePrivate *priv = cairo->priv;
if (priv->cr_surface != NULL)
{
cairo_surface_t *surface = priv->cr_surface;
/* if the surface is an image one, and the size is already the
* same, then we don't need to do anything
*/
if (cairo_surface_get_type (surface) != CAIRO_SURFACE_TYPE_IMAGE)
{
gint surface_width = cairo_image_surface_get_width (surface);
gint surface_height = cairo_image_surface_get_height (surface);
if (priv->width == surface_width &&
priv->height == surface_height)
return;
}
cairo_surface_finish (surface);
cairo_surface_destroy (surface);
priv->cr_surface = NULL;
}
if (priv->width == 0 || priv->height == 0)
return;
g_signal_emit (cairo, cairo_signals[CREATE_SURFACE], 0,
priv->width,
priv->height,
&priv->cr_surface);
}
static void
clutter_cairo_texture_notify (GObject *object,
GParamSpec *pspec)
{
/* When the surface width or height changes then resize the cairo
surface. This is done here instead of directly in set_property so
that if both the width and height properties are set using a
single call to g_object_set then the surface will only be resized
once because the notifications will be frozen in between */
if (strcmp ("surface-width", pspec->name) == 0 ||
strcmp ("surface-height", pspec->name) == 0)
{
ClutterCairoTexture *cairo = CLUTTER_CAIRO_TEXTURE (object);
clutter_cairo_texture_surface_resize_internal (cairo);
}
if (G_OBJECT_CLASS (clutter_cairo_texture_parent_class)->notify)
G_OBJECT_CLASS (clutter_cairo_texture_parent_class)->notify (object, pspec);
}
static void
clutter_cairo_texture_get_preferred_width (ClutterActor *actor,
gfloat for_height,
gfloat *min_width,
gfloat *natural_width)
{
ClutterCairoTexturePrivate *priv = CLUTTER_CAIRO_TEXTURE (actor)->priv;
if (min_width)
*min_width = 0;
if (natural_width)
*natural_width = (gfloat) priv->width;
}
static void
clutter_cairo_texture_get_preferred_height (ClutterActor *actor,
gfloat for_width,
gfloat *min_height,
gfloat *natural_height)
{
ClutterCairoTexturePrivate *priv = CLUTTER_CAIRO_TEXTURE (actor)->priv;
if (min_height)
*min_height = 0;
if (natural_height)
*natural_height = (gfloat) priv->height;
}
static gboolean
clutter_cairo_texture_get_paint_volume (ClutterActor *self,
ClutterPaintVolume *volume)
{
return _clutter_actor_set_default_paint_volume (self,
CLUTTER_TYPE_CAIRO_TEXTURE,
volume);
}
static cairo_surface_t *
clutter_cairo_texture_create_surface (ClutterCairoTexture *self,
guint width,
guint height)
{
cairo_surface_t *surface;
guint cairo_stride;
guint8 *cairo_data;
CoglHandle cogl_texture;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
width,
height);
cairo_stride = cairo_image_surface_get_stride (surface);
cairo_data = cairo_image_surface_get_data (surface);
self->priv->surface_width = width;
self->priv->surface_height = height;
/* create a backing Cogl texture */
cogl_texture = cogl_texture_new_from_data (width, height,
COGL_TEXTURE_NONE,
CLUTTER_CAIRO_TEXTURE_PIXEL_FORMAT,
COGL_PIXEL_FORMAT_ANY,
cairo_stride,
cairo_data);
clutter_texture_set_cogl_texture (CLUTTER_TEXTURE (self), cogl_texture);
cogl_handle_unref (cogl_texture);
return surface;
}
static gboolean
create_surface_accum (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer data)
{
g_value_copy (handler_return, return_accu);
/* stop on the first non-NULL return value */
return g_value_get_boxed (handler_return) == NULL;
}
static void
clutter_cairo_texture_class_init (ClutterCairoTextureClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
gobject_class->finalize = clutter_cairo_texture_finalize;
gobject_class->set_property = clutter_cairo_texture_set_property;
gobject_class->get_property = clutter_cairo_texture_get_property;
gobject_class->notify = clutter_cairo_texture_notify;
actor_class->get_paint_volume =
clutter_cairo_texture_get_paint_volume;
actor_class->get_preferred_width =
clutter_cairo_texture_get_preferred_width;
actor_class->get_preferred_height =
clutter_cairo_texture_get_preferred_height;
klass->create_surface = clutter_cairo_texture_create_surface;
g_type_class_add_private (gobject_class, sizeof (ClutterCairoTexturePrivate));
/**
* ClutterCairoTexture:surface-width:
*
* The width of the Cairo surface used by the #ClutterCairoTexture
* actor, in pixels.
*
* Since: 1.0
*/
obj_props[PROP_SURFACE_WIDTH] =
g_param_spec_uint ("surface-width",
P_("Surface Width"),
P_("The width of the Cairo surface"),
0, G_MAXUINT,
0,
CLUTTER_PARAM_READWRITE);
/**
* ClutterCairoTexture:surface-height:
*
* The height of the Cairo surface used by the #ClutterCairoTexture
* actor, in pixels.
*
* Since: 1.0
*/
obj_props[PROP_SURFACE_HEIGHT] =
g_param_spec_uint ("surface-height",
P_("Surface Height"),
P_("The height of the Cairo surface"),
0, G_MAXUINT,
0,
CLUTTER_PARAM_READWRITE);
_clutter_object_class_install_properties (gobject_class,
PROP_LAST,
obj_props);
/**
* ClutterCairoTexture::create-surface:
* @texture: the #ClutterCairoTexture that emitted the signal
* @width: the width of the surface to create
* @height: the height of the surface to create
*
* The ::create-surface signal is emitted when a #ClutterCairoTexture
* news its surface (re)created, which happens either when the Cairo
* context is created with clutter_cairo_texture_create() or
* clutter_cairo_texture_create_region(), or when the surface is resized
* through clutter_cairo_texture_set_surface_size().
*
* The first signal handler that returns a non-%NULL, valid surface will
* stop any further signal emission, and the returned surface will be
* the one used.
*
* Return value: the newly created #cairo_surface_t for the texture
*
* Since: 1.6
*/
cairo_signals[CREATE_SURFACE] =
g_signal_new (I_("create-surface"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterCairoTextureClass, create_surface),
create_surface_accum, NULL,
_clutter_marshal_BOXED__UINT_UINT,
CAIRO_GOBJECT_TYPE_SURFACE, 2,
G_TYPE_UINT,
G_TYPE_UINT);
}
static void
clutter_cairo_texture_init (ClutterCairoTexture *self)
{
ClutterCairoTexturePrivate *priv;
self->priv = priv = CLUTTER_CAIRO_TEXTURE_GET_PRIVATE (self);
/* FIXME - we are hardcoding the format; it would be good to have
* a :surface-format construct-only property for creating
* textures with a different format and have the cairo surface
* match that format
*
* priv->format = CAIRO_FORMAT_ARGB32;
*/
/* the Cairo surface is responsible for driving the size of
* the texture; if we let sync_size to its default of TRUE,
* the Texture will try to queue a relayout every time we
* change the size of the Cairo surface - which is not what
* we want
*/
clutter_texture_set_sync_size (CLUTTER_TEXTURE (self), FALSE);
}
/**
* clutter_cairo_texture_new:
* @width: the width of the surface
* @height: the height of the surface
*
* Creates a new #ClutterCairoTexture actor, with a surface of @width by
* @height pixels.
*
* Return value: the newly created #ClutterCairoTexture actor
*
* Since: 1.0
*/
ClutterActor*
clutter_cairo_texture_new (guint width,
guint height)
{
return g_object_new (CLUTTER_TYPE_CAIRO_TEXTURE,
"surface-width", width,
"surface-height", height,
NULL);
}
static void
clutter_cairo_texture_context_destroy (void *data)
{
ClutterCairoTextureContext *ctxt = data;
ClutterCairoTexture *cairo = ctxt->cairo;
ClutterCairoTexturePrivate *priv = cairo->priv;
guint8 *cairo_data;
gint cairo_width, cairo_height, cairo_stride;
gint surface_width, surface_height;
CoglHandle cogl_texture;
if (priv->cr_surface == NULL)
return;
/* for any other surface type, we presume that there exists a native
* communication between Cairo and GL that is triggered by cairo_destroy().
*
* for instance, cairo-drm will flush the outstanding modifications to the
* surface upon context destruction and so the texture is automatically
* updated.
*/
if (cairo_surface_get_type (priv->cr_surface) != CAIRO_SURFACE_TYPE_IMAGE)
goto out;
surface_width = cairo_image_surface_get_width (priv->cr_surface);
surface_height = cairo_image_surface_get_height (priv->cr_surface);
cairo_width = MIN (ctxt->rect.width, surface_width);
cairo_height = MIN (ctxt->rect.height, surface_height);
cogl_texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (cairo));
if (!cairo_width || !cairo_height || cogl_texture == COGL_INVALID_HANDLE)
{
g_slice_free (ClutterCairoTextureContext, ctxt);
return;
}
cairo_stride = cairo_image_surface_get_stride (priv->cr_surface);
cairo_data = cairo_image_surface_get_data (priv->cr_surface);
cairo_data += cairo_stride * ctxt->rect.y;
cairo_data += 4 * ctxt->rect.x;
cogl_texture_set_region (cogl_texture,
0, 0,
ctxt->rect.x, ctxt->rect.y,
cairo_width, cairo_height,
cairo_width, cairo_height,
CLUTTER_CAIRO_TEXTURE_PIXEL_FORMAT,
cairo_stride,
cairo_data);
out:
g_slice_free (ClutterCairoTextureContext, ctxt);
clutter_actor_queue_redraw (CLUTTER_ACTOR (cairo));
}
static void
intersect_rectangles (cairo_rectangle_int_t *a,
cairo_rectangle_int_t *b,
cairo_rectangle_int_t *inter)
{
gint dest_x, dest_y;
gint dest_width, dest_height;
dest_x = MAX (a->x, b->x);
dest_y = MAX (a->y, b->y);
dest_width = MIN (a->x + a->width, b->x + b->width) - dest_x;
dest_height = MIN (a->y + a->height, b->y + b->height) - dest_y;
if (dest_width > 0 && dest_height > 0)
{
inter->x = dest_x;
inter->y = dest_y;
inter->width = dest_width;
inter->height = dest_height;
}
else
{
inter->x = 0;
inter->y = 0;
inter->width = 0;
inter->height = 0;
}
}
/**
* clutter_cairo_texture_create_region:
* @self: a #ClutterCairoTexture
* @x_offset: offset of the region on the X axis
* @y_offset: offset of the region on the Y axis
* @width: width of the region, or -1 for the full surface width
* @height: height of the region, or -1 for the full surface height
*
* Creates a new Cairo context that will updat the region defined
* by @x_offset, @y_offset, @width and @height.
*
* <warning><para>Do not call this function within the paint virtual
* function or from a callback to the #ClutterActor::paint
* signal.</para></warning>
*
* Return value: a newly created Cairo context. Use cairo_destroy()
* to upload the contents of the context when done drawing
*
* Since: 1.0
*/
cairo_t *
clutter_cairo_texture_create_region (ClutterCairoTexture *self,
gint x_offset,
gint y_offset,
gint width,
gint height)
{
ClutterCairoTexturePrivate *priv;
ClutterCairoTextureContext *ctxt;
cairo_rectangle_int_t region, area, inter;
cairo_surface_t *surface;
cairo_t *cr;
g_return_val_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self), NULL);
clutter_warn_if_paint_fail (self);
priv = self->priv;
if (width < 0)
width = priv->width;
if (height < 0)
height = priv->height;
if (width == 0 || height == 0)
{
g_warning ("Unable to create a context for an image surface of "
"width %d and height %d. Set the surface size to be "
"at least 1 pixel by 1 pixel.",
width, height);
return NULL;
}
surface = get_surface (self);
ctxt = g_slice_new0 (ClutterCairoTextureContext);
ctxt->cairo = self;
region.x = x_offset;
region.y = y_offset;
region.width = width;
region.height = height;
area.x = 0;
area.y = 0;
area.width = priv->width;
area.height = priv->height;
/* Limit the region to the visible rectangle */
intersect_rectangles (&area, &region, &inter);
ctxt->rect = inter;
cr = cairo_create (surface);
cairo_set_user_data (cr, &clutter_cairo_texture_context_key,
ctxt,
clutter_cairo_texture_context_destroy);
return cr;
}
/**
* clutter_cairo_texture_create:
* @self: a #ClutterCairoTexture
*
* Creates a new Cairo context for the @cairo texture. It is
* similar to using clutter_cairo_texture_create_region() with @x_offset
* and @y_offset of 0, @width equal to the @cairo texture surface width
* and @height equal to the @cairo texture surface height.
*
* <warning><para>Do not call this function within the paint virtual
* function or from a callback to the #ClutterActor::paint
* signal.</para></warning>
*
* Return value: a newly created Cairo context. Use cairo_destroy()
* to upload the contents of the context when done drawing
*
* Since: 1.0
*/
cairo_t *
clutter_cairo_texture_create (ClutterCairoTexture *self)
{
g_return_val_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self), NULL);
clutter_warn_if_paint_fail (self);
return clutter_cairo_texture_create_region (self, 0, 0, -1, -1);
}
/**
* clutter_cairo_set_source_color:
* @cr: a Cairo context
* @color: a #ClutterColor
*
* Utility function for setting the source color of @cr using
* a #ClutterColor.
*
* Since: 1.0
*/
void
clutter_cairo_set_source_color (cairo_t *cr,
const ClutterColor *color)
{
g_return_if_fail (cr != NULL);
g_return_if_fail (color != NULL);
if (color->alpha == 0xff)
cairo_set_source_rgb (cr,
color->red / 255.0,
color->green / 255.0,
color->blue / 255.0);
else
cairo_set_source_rgba (cr,
color->red / 255.0,
color->green / 255.0,
color->blue / 255.0,
color->alpha / 255.0);
}
/**
* clutter_cairo_texture_set_surface_size:
* @self: a #ClutterCairoTexture
* @width: the new width of the surface
* @height: the new height of the surface
*
* Resizes the Cairo surface used by @self to @width and @height.
*
* Since: 1.0
*/
void
clutter_cairo_texture_set_surface_size (ClutterCairoTexture *self,
guint width,
guint height)
{
ClutterCairoTexturePrivate *priv;
g_return_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self));
priv = self->priv;
if (width == priv->width && height == priv->height)
return;
g_object_freeze_notify (G_OBJECT (self));
if (priv->width != width)
{
priv->width = width;
_clutter_notify_by_pspec (G_OBJECT (self), obj_props[PROP_SURFACE_WIDTH]);
}
if (priv->height != height)
{
priv->height = height;
_clutter_notify_by_pspec (G_OBJECT (self), obj_props[PROP_SURFACE_HEIGHT]);
}
clutter_cairo_texture_surface_resize_internal (self);
g_object_thaw_notify (G_OBJECT (self));
}
/**
* clutter_cairo_texture_get_surface_size:
* @self: a #ClutterCairoTexture
* @width: (out): return location for the surface width, or %NULL
* @height: (out): return location for the surface height, or %NULL
*
* Retrieves the surface width and height for @self.
*
* Since: 1.0
*/
void
clutter_cairo_texture_get_surface_size (ClutterCairoTexture *self,
guint *width,
guint *height)
{
g_return_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self));
if (width)
*width = self->priv->width;
if (height)
*height = self->priv->height;
}
/**
* clutter_cairo_texture_clear:
* @self: a #ClutterCairoTexture
*
* Clears @self's internal drawing surface, so that the next upload
* will replace the previous contents of the #ClutterCairoTexture
* rather than adding to it.
*
* Since: 1.0
*/
void
clutter_cairo_texture_clear (ClutterCairoTexture *self)
{
cairo_surface_t *surface;
cairo_t *cr;
g_return_if_fail (CLUTTER_IS_CAIRO_TEXTURE (self));
surface = get_surface (self);
cr = cairo_create (surface);
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_destroy (cr);
}
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