1 // An image on the canvas
3 // Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License as
7 // published by the Free Software Foundation; either version 2 of the
8 // License, or (at your option) any later version.
10 // This program is distributed in the hope that it will be useful, but
11 // WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #include "CanvasImage.hxx"
21 #include <osgDB/ReadFile>
23 #include <Canvas/canvas.hxx>
24 #include <Canvas/canvas_mgr.hxx>
25 #include <Canvas/property_helper.hxx>
27 #include <osg/Geometry>
28 #include <osg/PrimitiveSet>
30 #include <Main/globals.hxx>
31 #include <Main/fg_props.hxx>
33 #include <boost/algorithm/string/predicate.hpp>
36 * Callback to enable/disable rendering of canvas displayed inside windows or
40 public osg::Drawable::CullCallback
43 CullCallback(Canvas::CameraCullCallback* camera_cull);
46 Canvas::CameraCullCallback *_camera_cull;
48 virtual bool cull( osg::NodeVisitor* nv,
49 osg::Drawable* drawable,
50 osg::RenderInfo* renderInfo ) const;
53 //------------------------------------------------------------------------------
54 CullCallback::CullCallback(Canvas::CameraCullCallback* camera_cull):
55 _camera_cull( camera_cull )
60 //------------------------------------------------------------------------------
61 bool CullCallback::cull( osg::NodeVisitor* nv,
62 osg::Drawable* drawable,
63 osg::RenderInfo* renderInfo ) const
65 _camera_cull->enableRendering();
67 // TODO check if window/image should be culled
73 //----------------------------------------------------------------------------
74 Image::Image(SGPropertyNode_ptr node, const Style& parent_style):
75 Element(node, parent_style, BOUNDING_BOX),
76 _texture(new osg::Texture2D),
77 _node_src_rect( node->getNode("source", 0, true) )
79 _geom = new osg::Geometry;
80 _geom->setUseDisplayList(false);
82 osg::StateSet *stateSet = _geom->getOrCreateStateSet();
83 stateSet->setTextureAttributeAndModes(0, _texture.get());
84 stateSet->setDataVariance(osg::Object::STATIC);
86 // allocate arrays for the image
87 _vertices = new osg::Vec3Array(4);
88 _vertices->setDataVariance(osg::Object::STATIC);
89 _geom->setVertexArray(_vertices);
91 _texCoords = new osg::Vec2Array(4);
92 _texCoords->setDataVariance(osg::Object::STATIC);
93 _geom->setTexCoordArray(0, _texCoords);
95 _colors = new osg::Vec4Array(4);
96 _colors->setDataVariance(osg::Object::STATIC);
97 _geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
98 _geom->setColorArray(_colors);
100 osg::DrawArrays* prim = new osg::DrawArrays(osg::PrimitiveSet::QUADS);
101 prim->set(osg::PrimitiveSet::QUADS, 0, 4);
102 prim->setDataVariance(osg::Object::STATIC);
103 _geom->addPrimitiveSet(prim);
107 addStyle("fill", &Image::setFill, this);
108 setFill("#ffffff"); // TODO how should we handle default values?
113 //----------------------------------------------------------------------------
119 //----------------------------------------------------------------------------
120 void Image::update(double dt)
124 if( _attributes_dirty & DEST_SIZE )
126 (*_vertices)[0].set(_region.l(), _region.t(), 0);
127 (*_vertices)[1].set(_region.r(), _region.t(), 0);
128 (*_vertices)[2].set(_region.r(), _region.b(), 0);
129 (*_vertices)[3].set(_region.l(), _region.b(), 0);
132 _attributes_dirty &= ~DEST_SIZE;
136 if( _attributes_dirty & SRC_RECT )
138 double u0 = _src_rect.l(),
143 if( !_node_src_rect->getBoolValue("normalized", true) )
145 const Rect<int>& tex_dim = getTextureDimensions();
147 u0 /= tex_dim.width();
148 u1 /= tex_dim.width();
149 v0 /= tex_dim.height();
150 v1 /= tex_dim.height();
153 (*_texCoords)[0].set(u0, v0);
154 (*_texCoords)[1].set(u1, v0);
155 (*_texCoords)[2].set(u1, v1);
156 (*_texCoords)[3].set(u0, v1);
159 _attributes_dirty &= ~SRC_RECT;
163 //----------------------------------------------------------------------------
164 void Image::setCanvas(CanvasPtr canvas)
167 _geom->getOrCreateStateSet()
168 ->setTextureAttribute(0, canvas ? canvas->getTexture() : 0);
169 _geom->setCullCallback(
170 canvas ? new CullCallback(canvas->getCameraCullCallback()) : 0
173 if( !_canvas.expired() )
174 setupDefaultDimensions();
177 //----------------------------------------------------------------------------
178 CanvasWeakPtr Image::getCanvas() const
183 //----------------------------------------------------------------------------
184 void Image::setImage(osg::Image *img)
187 setCanvas( CanvasPtr() );
189 _texture->setImage(img);
190 _geom->getOrCreateStateSet()
191 ->setTextureAttributeAndModes(0, _texture);
194 setupDefaultDimensions();
197 //----------------------------------------------------------------------------
198 void Image::setFill(const std::string& fill)
200 osg::Vec4 color = parseColor(fill);
201 for( int i = 0; i < 4; ++i )
202 (*_colors)[i] = color;
206 //----------------------------------------------------------------------------
207 const Rect<float>& Image::getRegion() const
212 //----------------------------------------------------------------------------
213 void Image::childChanged(SGPropertyNode* child)
215 const std::string& name = child->getNameString();
217 if( child->getParent() == _node_src_rect )
219 _attributes_dirty |= SRC_RECT;
222 _src_rect.setLeft( child->getFloatValue() );
223 else if( name == "right" )
224 _src_rect.setRight( child->getFloatValue() );
225 else if( name == "top" )
226 _src_rect.setTop( child->getFloatValue() );
227 else if( name == "bottom" )
228 _src_rect.setBottom( child->getFloatValue() );
232 else if( child->getParent() != _node )
237 _region.setX( child->getFloatValue() );
238 _attributes_dirty |= DEST_SIZE;
240 else if( name == "y" )
242 _region.setY( child->getFloatValue() );
243 _attributes_dirty |= DEST_SIZE;
245 else if( name == "size" )
247 if( child->getIndex() == 0 )
248 _region.setWidth( child->getFloatValue() );
250 _region.setHeight( child->getFloatValue() );
252 _attributes_dirty |= DEST_SIZE;
254 else if( name == "file" )
256 static const std::string CANVAS_PROTOCOL = "canvas://";
257 const std::string& path = child->getStringValue();
259 if( boost::starts_with(path, CANVAS_PROTOCOL) )
261 CanvasMgr* canvas_mgr =
262 dynamic_cast<CanvasMgr*>(globals->get_subsystem("Canvas"));
265 SG_LOG(SG_GL, SG_ALERT, "canvas::Image: Failed to get CanvasMgr");
269 const SGPropertyNode* canvas_node =
270 canvas_mgr->getPropertyRoot()
272 ->getNode( path.substr(CANVAS_PROTOCOL.size()) );
275 SG_LOG(SG_GL, SG_ALERT, "canvas::Image: No such canvas: " << path);
279 // TODO add support for other means of addressing canvases (eg. by
281 CanvasPtr canvas = canvas_mgr->getCanvas( canvas_node->getIndex() );
284 SG_LOG(SG_GL, SG_ALERT, "canvas::Image: Invalid canvas: " << path);
292 SGPath tpath = globals->resolve_ressource_path(path);
293 if( tpath.isNull() || !tpath.exists() )
295 SG_LOG(SG_GL, SG_ALERT, "canvas::Image: No such image: " << path);
299 setImage( osgDB::readImageFile(tpath.c_str()) );
304 //----------------------------------------------------------------------------
305 void Image::setupDefaultDimensions()
307 if( !_src_rect.width() || !_src_rect.height() )
309 const Rect<int>& tex_dim = getTextureDimensions();
311 _node_src_rect->setBoolValue("normalized", false);
312 _node_src_rect->setFloatValue("right", tex_dim.width());
313 _node_src_rect->setFloatValue("bottom", tex_dim.height());
316 if( !_region.width() || !_region.height() )
318 _node->setFloatValue("size[0]", _src_rect.width());
319 _node->setFloatValue("size[1]", _src_rect.height());
323 //----------------------------------------------------------------------------
324 Rect<int> Image::getTextureDimensions() const
326 osg::Texture2D *texture = !_canvas.expired()
327 ? _canvas.lock()->getTexture()
336 texture->getTextureWidth(),
337 texture->getTextureHeight()
341 } // namespace canvas