2 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <dali-toolkit/internal/text/clipping/text-clipper.h>
23 #include <dali/public-api/common/stage.h>
24 #include <dali/public-api/render-tasks/render-task-list.h>
25 #include <dali/integration-api/debug.h>
30 // Currently on desktop machines 2k x 2k is the maximum frame buffer size, on target is 4k x 4k.
31 const float MAX_OFFSCREEN_RENDERING_SIZE = 2048.f;
45 ClipperPtr Clipper::New( const Vector2& size )
47 ClipperPtr clipper( new Clipper() );
50 clipper->Initialize( size );
55 Actor Clipper::GetRootActor() const
57 return mOffscreenRootActor;
60 ImageActor Clipper::GetImageActor() const
65 void Clipper::Refresh( const Vector2& size )
67 const Size offscreenSize( std::min( MAX_OFFSCREEN_RENDERING_SIZE, size.width ),
68 std::min( MAX_OFFSCREEN_RENDERING_SIZE, size.height ) );
70 const bool sizeChanged = offscreenSize != mCurrentOffscreenSize;
74 // Reconfigure camera for current size.
75 mOffscreenCameraActor.SetOrthographicProjection( offscreenSize );
77 // Recreate frame buffer for offscreen rendering when the size changes.
78 FrameBufferImage frameBufferImage = FrameBufferImage::New( offscreenSize.width,
81 mImageActor.SetSize( offscreenSize );
82 mImageActor.SetImage( frameBufferImage );
83 mRenderTask.SetTargetFrameBuffer( frameBufferImage );
85 // Stores current size to avoid create new Dali resources if text changes.
86 mCurrentOffscreenSize = offscreenSize;
89 mRenderTask.SetRefreshRate( RenderTask::REFRESH_ONCE );
92 void Clipper::Initialize( const Vector2& size )
94 const Size offscreenSize( std::min( MAX_OFFSCREEN_RENDERING_SIZE, size.width ),
95 std::min( MAX_OFFSCREEN_RENDERING_SIZE, size.height ) );
97 // Create a root actor and an image actor for offscreen rendering.
98 mOffscreenRootActor = Layer::New();
99 mOffscreenRootActor.SetColorMode( USE_OWN_COLOR );
100 mOffscreenRootActor.SetPositionInheritanceMode( DONT_INHERIT_POSITION );
101 mOffscreenRootActor.SetInheritRotation( false );
102 mOffscreenRootActor.SetInheritScale( false );
103 mOffscreenRootActor.SetDepthTestDisabled( true );
104 mOffscreenRootActor.SetSize( offscreenSize );
106 mImageActor = ImageActor::New();
107 mImageActor.SetParentOrigin( ParentOrigin::CENTER );
108 mImageActor.SetBlendFunc( BlendingFactor::ONE, BlendingFactor::ONE_MINUS_SRC_ALPHA,
109 BlendingFactor::ONE, BlendingFactor::ONE );
110 mImageActor.SetScale( Vector3( 1.0f, -1.0f, 1.0f ) );
111 mImageActor.SetSize( offscreenSize );
113 // Creates a new camera actor.
114 mOffscreenCameraActor = CameraActor::New();
115 mOffscreenCameraActor.SetParentOrigin( ParentOrigin::CENTER );
116 mOffscreenCameraActor.SetOrthographicProjection( offscreenSize );
117 mOffscreenRootActor.Add( mOffscreenCameraActor ); // camera to shoot the offscreen text
119 // Creates a new render task.
120 mRenderTask = Stage::GetCurrent().GetRenderTaskList().CreateTask();
121 mRenderTask.SetSourceActor( mOffscreenRootActor );
122 mRenderTask.SetClearColor( Color::TRANSPARENT );
123 mRenderTask.SetClearEnabled( true );
124 mRenderTask.SetExclusive( true );
125 mRenderTask.SetCameraActor( mOffscreenCameraActor );
127 // Creates a frame buffer for offscreen rendering
128 FrameBufferImage frameBufferImage = FrameBufferImage::New( offscreenSize.width,
129 offscreenSize.height,
131 mImageActor.SetImage( frameBufferImage );
132 mRenderTask.SetTargetFrameBuffer( frameBufferImage );
134 // Stores current size to avoid create new Dali resources if text changes.
135 mCurrentOffscreenSize = offscreenSize;
144 if( Stage::IsInstalled() )
146 UnparentAndReset( mOffscreenRootActor );
147 UnparentAndReset( mImageActor );
149 Stage::GetCurrent().GetRenderTaskList().RemoveTask( mRenderTask );
155 } // namespace Toolkit