mutter/src/compositor/meta-shaped-texture.c

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/*
* shaped texture
*
* An actor to draw a texture clipped to a list of rectangles
*
* Authored By Neil Roberts <neil@linux.intel.com>
*
* Copyright (C) 2008 Intel Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <config.h>
#include "meta-shaped-texture.h"
#include "meta-texture-tower.h"
#include "meta-texture-rectangle.h"
#include <clutter/clutter.h>
#include <cogl/cogl.h>
#include <string.h>
static void meta_shaped_texture_dispose (GObject *object);
static void meta_shaped_texture_notify (GObject *object,
GParamSpec *pspec);
static void meta_shaped_texture_paint (ClutterActor *actor);
static void meta_shaped_texture_pick (ClutterActor *actor,
const ClutterColor *color);
static void meta_shaped_texture_update_area (ClutterX11TexturePixmap *texture,
int x,
int y,
int width,
int height);
static void meta_shaped_texture_dirty_mask (MetaShapedTexture *stex);
G_DEFINE_TYPE (MetaShapedTexture, meta_shaped_texture,
CLUTTER_X11_TYPE_TEXTURE_PIXMAP);
#define META_SHAPED_TEXTURE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), META_TYPE_SHAPED_TEXTURE, \
MetaShapedTexturePrivate))
struct _MetaShapedTexturePrivate
{
MetaTextureTower *paint_tower;
CoglHandle mask_texture;
CoglHandle material;
CoglHandle material_unshaped;
cairo_region_t *clip_region;
cairo_region_t *shape_region;
guint mask_width, mask_height;
guint create_mipmaps : 1;
};
static void
meta_shaped_texture_class_init (MetaShapedTextureClass *klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
ClutterActorClass *actor_class = (ClutterActorClass *) klass;
ClutterX11TexturePixmapClass *x11_texture_class = (ClutterX11TexturePixmapClass *) klass;
gobject_class->dispose = meta_shaped_texture_dispose;
gobject_class->notify = meta_shaped_texture_notify;
actor_class->paint = meta_shaped_texture_paint;
actor_class->pick = meta_shaped_texture_pick;
x11_texture_class->update_area = meta_shaped_texture_update_area;
g_type_class_add_private (klass, sizeof (MetaShapedTexturePrivate));
}
static void
meta_shaped_texture_init (MetaShapedTexture *self)
{
MetaShapedTexturePrivate *priv;
priv = self->priv = META_SHAPED_TEXTURE_GET_PRIVATE (self);
priv->shape_region = NULL;
priv->paint_tower = meta_texture_tower_new ();
priv->mask_texture = COGL_INVALID_HANDLE;
priv->create_mipmaps = TRUE;
}
static void
meta_shaped_texture_dispose (GObject *object)
{
MetaShapedTexture *self = (MetaShapedTexture *) object;
MetaShapedTexturePrivate *priv = self->priv;
if (priv->paint_tower)
meta_texture_tower_free (priv->paint_tower);
priv->paint_tower = NULL;
meta_shaped_texture_dirty_mask (self);
if (priv->material != COGL_INVALID_HANDLE)
{
cogl_handle_unref (priv->material);
priv->material = COGL_INVALID_HANDLE;
}
if (priv->material_unshaped != COGL_INVALID_HANDLE)
{
cogl_handle_unref (priv->material_unshaped);
priv->material_unshaped = COGL_INVALID_HANDLE;
}
meta_shaped_texture_set_shape_region (self, NULL);
meta_shaped_texture_set_clip_region (self, NULL);
G_OBJECT_CLASS (meta_shaped_texture_parent_class)->dispose (object);
}
static void
meta_shaped_texture_notify (GObject *object,
GParamSpec *pspec)
{
if (G_OBJECT_CLASS (meta_shaped_texture_parent_class)->notify)
G_OBJECT_CLASS (meta_shaped_texture_parent_class)->notify (object, pspec);
/* It seems like we could just do this out of update_area(), but unfortunately,
* clutter_glx_texture_pixmap() doesn't call through the vtable on the
* initial update_area, so we need to look for changes to the texture
* explicitly.
*/
if (strcmp (pspec->name, "cogl-texture") == 0)
{
MetaShapedTexture *stex = (MetaShapedTexture *) object;
MetaShapedTexturePrivate *priv = stex->priv;
meta_shaped_texture_clear (stex);
if (priv->create_mipmaps)
meta_texture_tower_set_base_texture (priv->paint_tower,
clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (stex)));
}
}
static void
meta_shaped_texture_dirty_mask (MetaShapedTexture *stex)
{
MetaShapedTexturePrivate *priv = stex->priv;
if (priv->mask_texture != COGL_INVALID_HANDLE)
{
cogl_handle_unref (priv->mask_texture);
priv->mask_texture = COGL_INVALID_HANDLE;
if (priv->material != COGL_INVALID_HANDLE)
cogl_material_set_layer (priv->material, 1, COGL_INVALID_HANDLE);
}
}
static void
meta_shaped_texture_ensure_mask (MetaShapedTexture *stex)
{
MetaShapedTexturePrivate *priv = stex->priv;
CoglHandle paint_tex;
guint tex_width, tex_height;
paint_tex = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (stex));
if (paint_tex == COGL_INVALID_HANDLE)
return;
tex_width = cogl_texture_get_width (paint_tex);
tex_height = cogl_texture_get_height (paint_tex);
/* If the mask texture we have was created for a different size then
recreate it */
if (priv->mask_texture != COGL_INVALID_HANDLE
&& (priv->mask_width != tex_width || priv->mask_height != tex_height))
meta_shaped_texture_dirty_mask (stex);
/* If we don't have a mask texture yet then create one */
if (priv->mask_texture == COGL_INVALID_HANDLE)
{
guchar *mask_data;
int i;
int n_rects;
GLenum paint_gl_target;
/* Create data for an empty image */
mask_data = g_malloc0 (tex_width * tex_height);
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n_rects = cairo_region_num_rectangles (priv->shape_region);
/* Fill in each rectangle. */
for (i = 0; i < n_rects; i ++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (priv->shape_region, i, &rect);
gint x1 = rect.x, x2 = x1 + rect.width;
gint y1 = rect.y, y2 = y1 + rect.height;
guchar *p;
/* Clip the rectangle to the size of the texture */
x1 = CLAMP (x1, 0, (gint) tex_width - 1);
x2 = CLAMP (x2, x1, (gint) tex_width);
y1 = CLAMP (y1, 0, (gint) tex_height - 1);
y2 = CLAMP (y2, y1, (gint) tex_height);
/* Fill the rectangle */
for (p = mask_data + y1 * tex_width + x1;
y1 < y2;
y1++, p += tex_width)
memset (p, 255, x2 - x1);
}
cogl_texture_get_gl_texture (paint_tex, NULL, &paint_gl_target);
#ifdef GL_TEXTURE_RECTANGLE_ARB
if (paint_gl_target == GL_TEXTURE_RECTANGLE_ARB)
{
priv->mask_texture
= meta_texture_rectangle_new (tex_width, tex_height,
0, /* flags */
/* data format */
COGL_PIXEL_FORMAT_A_8,
/* internal GL format */
GL_ALPHA,
/* internal cogl format */
COGL_PIXEL_FORMAT_A_8,
/* rowstride */
tex_width,
mask_data);
}
else
#endif /* GL_TEXTURE_RECTANGLE_ARB */
priv->mask_texture = cogl_texture_new_from_data (tex_width, tex_height,
COGL_TEXTURE_NONE,
COGL_PIXEL_FORMAT_A_8,
COGL_PIXEL_FORMAT_ANY,
tex_width,
mask_data);
g_free (mask_data);
priv->mask_width = tex_width;
priv->mask_height = tex_height;
}
}
static void
meta_shaped_texture_paint (ClutterActor *actor)
{
MetaShapedTexture *stex = (MetaShapedTexture *) actor;
MetaShapedTexturePrivate *priv = stex->priv;
CoglHandle paint_tex;
guint tex_width, tex_height;
ClutterActorBox alloc;
static CoglHandle material_template = COGL_INVALID_HANDLE;
static CoglHandle material_unshaped_template = COGL_INVALID_HANDLE;
CoglHandle material;
if (priv->clip_region && cairo_region_is_empty (priv->clip_region))
return;
if (!CLUTTER_ACTOR_IS_REALIZED (CLUTTER_ACTOR (stex)))
clutter_actor_realize (CLUTTER_ACTOR (stex));
/* The GL EXT_texture_from_pixmap extension does allow for it to be
* used together with SGIS_generate_mipmap, however this is very
* rarely supported. Also, even when it is supported there
* are distinct performance implications from:
*
* - Updating mipmaps that we don't need
* - Having to reallocate pixmaps on the server into larger buffers
*
* So, we just unconditionally use our mipmap emulation code. If we
* wanted to use SGIS_generate_mipmap, we'd have to query COGL to
* see if it was supported (no API currently), and then if and only
* if that was the case, set the clutter texture quality to HIGH.
* Setting the texture quality to high without SGIS_generate_mipmap
* support for TFP textures will result in fallbacks to XGetImage.
*/
if (priv->create_mipmaps)
paint_tex = meta_texture_tower_get_paint_texture (priv->paint_tower);
else
paint_tex = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (stex));
if (paint_tex == COGL_INVALID_HANDLE)
return;
tex_width = cogl_texture_get_width (paint_tex);
tex_height = cogl_texture_get_height (paint_tex);
if (tex_width == 0 || tex_height == 0) /* no contents yet */
return;
if (priv->shape_region == NULL)
{
/* No region means an unclipped shape. Use a single-layer texture. */
if (priv->material_unshaped == COGL_INVALID_HANDLE)
{
if (G_UNLIKELY (material_unshaped_template == COGL_INVALID_HANDLE))
material_unshaped_template = cogl_material_new ();
priv->material_unshaped = cogl_material_copy (material_unshaped_template);
}
material = priv->material_unshaped;
}
else
{
meta_shaped_texture_ensure_mask (stex);
if (priv->material == COGL_INVALID_HANDLE)
{
if (G_UNLIKELY (material_template == COGL_INVALID_HANDLE))
{
material_template = cogl_material_new ();
cogl_material_set_layer_combine (material_template, 1,
"RGBA = MODULATE (PREVIOUS, TEXTURE[A])",
NULL);
}
priv->material = cogl_material_copy (material_template);
}
material = priv->material;
cogl_material_set_layer (material, 1, priv->mask_texture);
}
cogl_material_set_layer (material, 0, paint_tex);
{
CoglColor color;
guchar opacity = clutter_actor_get_paint_opacity (actor);
cogl_color_set_from_4ub (&color, opacity, opacity, opacity, opacity);
cogl_material_set_color (material, &color);
}
cogl_set_source (material);
clutter_actor_get_allocation_box (actor, &alloc);
if (priv->clip_region)
{
int n_rects;
int i;
/* Limit to how many separate rectangles we'll draw; beyond this just
* fall back and draw the whole thing */
# define MAX_RECTS 16
n_rects = cairo_region_num_rectangles (priv->clip_region);
if (n_rects <= MAX_RECTS)
{
float coords[8];
float x1, y1, x2, y2;
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (priv->clip_region, i, &rect);
x1 = rect.x;
y1 = rect.y;
x2 = rect.x + rect.width;
y2 = rect.y + rect.height;
coords[0] = rect.x / (alloc.x2 - alloc.x1);
coords[1] = rect.y / (alloc.y2 - alloc.y1);
coords[2] = (rect.x + rect.width) / (alloc.x2 - alloc.x1);
coords[3] = (rect.y + rect.height) / (alloc.y2 - alloc.y1);
coords[4] = coords[0];
coords[5] = coords[1];
coords[6] = coords[2];
coords[7] = coords[3];
cogl_rectangle_with_multitexture_coords (x1, y1, x2, y2,
&coords[0], 8);
}
return;
}
}
cogl_rectangle (0, 0,
alloc.x2 - alloc.x1,
alloc.y2 - alloc.y1);
}
static void
meta_shaped_texture_pick (ClutterActor *actor,
const ClutterColor *color)
{
MetaShapedTexture *stex = (MetaShapedTexture *) actor;
MetaShapedTexturePrivate *priv = stex->priv;
/* If there is no region then use the regular pick */
if (priv->shape_region == NULL)
CLUTTER_ACTOR_CLASS (meta_shaped_texture_parent_class)
->pick (actor, color);
else if (clutter_actor_should_pick_paint (actor))
{
CoglHandle paint_tex;
ClutterActorBox alloc;
guint tex_width, tex_height;
paint_tex = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (stex));
if (paint_tex == COGL_INVALID_HANDLE)
return;
tex_width = cogl_texture_get_width (paint_tex);
tex_height = cogl_texture_get_height (paint_tex);
if (tex_width == 0 || tex_height == 0) /* no contents yet */
return;
meta_shaped_texture_ensure_mask (stex);
cogl_set_source_color4ub (color->red, color->green, color->blue,
color->alpha);
clutter_actor_get_allocation_box (actor, &alloc);
/* Paint the mask rectangle in the given color */
cogl_set_source_texture (priv->mask_texture);
cogl_rectangle_with_texture_coords (0, 0,
alloc.x2 - alloc.x1,
alloc.y2 - alloc.y1,
0, 0, 1, 1);
}
}
static void
meta_shaped_texture_update_area (ClutterX11TexturePixmap *texture,
int x,
int y,
int width,
int height)
{
MetaShapedTexture *stex = (MetaShapedTexture *) texture;
MetaShapedTexturePrivate *priv = stex->priv;
CLUTTER_X11_TEXTURE_PIXMAP_CLASS (meta_shaped_texture_parent_class)->update_area (texture,
x, y, width, height);
meta_texture_tower_update_area (priv->paint_tower, x, y, width, height);
}
ClutterActor *
meta_shaped_texture_new (void)
{
ClutterActor *self = g_object_new (META_TYPE_SHAPED_TEXTURE, NULL);
return self;
}
void
meta_shaped_texture_set_create_mipmaps (MetaShapedTexture *stex,
gboolean create_mipmaps)
{
MetaShapedTexturePrivate *priv;
g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
priv = stex->priv;
create_mipmaps = create_mipmaps != FALSE;
if (create_mipmaps != priv->create_mipmaps)
{
CoglHandle base_texture;
priv->create_mipmaps = create_mipmaps;
base_texture = create_mipmaps ?
clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (stex)) : COGL_INVALID_HANDLE;
meta_texture_tower_set_base_texture (priv->paint_tower, base_texture);
}
}
/* This is a workaround for deficiencies in the hack tower:
*
* When we call clutter_x11_texture_pixmap_set_pixmap(tp, None),
* ClutterX11TexturePixmap knows that it has to get rid of the old texture, but
* clutter_texture_set_cogl_texture(texture, COGL_INVALID_HANDLE) isn't allowed, so
* it grabs the material for the texture and manually sets the texture in it. This means
* that the "cogl-texture" property isn't notified, so we don't find out about it.
*
* And if we keep the CoglX11TexturePixmap around after the X pixmap is freed, then
* we'll trigger X errors when we actually try to free it.
*
* The only correct thing to do here is to change our code to derive
* from ClutterActor and get rid of the inheritance hack tower. Once
* we want to depend on Clutter-1.4 (which has CoglTexturePixmapX11),
* that will be very easy to do.
*/
void
meta_shaped_texture_clear (MetaShapedTexture *stex)
{
MetaShapedTexturePrivate *priv;
g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
priv = stex->priv;
meta_texture_tower_set_base_texture (priv->paint_tower, COGL_INVALID_HANDLE);
if (priv->material != COGL_INVALID_HANDLE)
cogl_material_set_layer (priv->material, 0, COGL_INVALID_HANDLE);
if (priv->material_unshaped != COGL_INVALID_HANDLE)
cogl_material_set_layer (priv->material_unshaped, 0, COGL_INVALID_HANDLE);
}
void
meta_shaped_texture_set_shape_region (MetaShapedTexture *stex,
cairo_region_t *region)
{
MetaShapedTexturePrivate *priv;
g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
priv = stex->priv;
if (priv->shape_region != NULL)
{
cairo_region_destroy (priv->shape_region);
priv->shape_region = NULL;
}
if (region != NULL)
{
cairo_region_reference (region);
priv->shape_region = region;
}
meta_shaped_texture_dirty_mask (stex);
clutter_actor_queue_redraw (CLUTTER_ACTOR (stex));
}
/**
* meta_shaped_texture_set_clip_region:
* @frame: a #TidyTextureframe
* @clip_region: (transfer full): the region of the texture that
* is visible and should be painted. OWNERSHIP IS ASSUMED BY
* THE FUNCTION (for efficiency to avoid a copy.)
*
* Provides a hint to the texture about what areas of the texture
* are not completely obscured and thus need to be painted. This
* is an optimization and is not supposed to have any effect on
* the output.
*
* Typically a parent container will set the clip region before
* painting its children, and then unset it afterwards.
*/
void
meta_shaped_texture_set_clip_region (MetaShapedTexture *stex,
cairo_region_t *clip_region)
{
MetaShapedTexturePrivate *priv;
g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
priv = stex->priv;
if (priv->clip_region)
{
cairo_region_destroy (priv->clip_region);
priv->clip_region = NULL;
}
priv->clip_region = clip_region;
}