X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=dali%2Finternal%2Frender%2Fcommon%2Frender-item.cpp;h=ad024e82571ef7ca2da8a5a340d0ebe9e7d042b2;hb=bf3a0f98287cf675835fbba21de112f109f23080;hp=f8855f3abb613070d91d8e3e0992abd7d8bb6f26;hpb=0134ea4e146744fa0946c5f266bdf2408b0a269d;p=platform%2Fcore%2Fuifw%2Fdali-core.git

diff --git a/dali/internal/render/common/render-item.cpp b/dali/internal/render/common/render-item.cpp
index f8855f3..ad024e8 100644
--- a/dali/internal/render/common/render-item.cpp
+++ b/dali/internal/render/common/render-item.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@
 // INTERNAL INCLUDES
 #include <dali/internal/common/memory-pool-object-allocator.h>
 #include <dali/internal/render/renderers/render-renderer.h>
+#include <dali/internal/common/math.h>
 
 namespace
 {
@@ -47,10 +48,9 @@ RenderItem::RenderItem()
   mSize(),
   mRenderer( NULL ),
   mNode( NULL ),
-  mBatchRenderGeometry( NULL ),
+  mTextureSet( NULL ),
   mDepthIndex( 0 ),
-  mIsOpaque( true ),
-  mBatched( false )
+  mIsOpaque( true )
 {
 }
 
@@ -58,11 +58,64 @@ RenderItem::~RenderItem()
 {
 }
 
+
+ClippingBox RenderItem::CalculateViewportSpaceAABB( const int viewportWidth, const int viewportHeight ) const
+{
+  // Calculate extent vector of the AABB:
+  const float halfActorX = mSize.x * 0.5f;
+  const float halfActorY = mSize.y * 0.5f;
+
+  // To transform the actor bounds to screen-space, We do a fast, 2D version of a matrix multiply optimized for 2D quads.
+  // This reduces float multiplications from 64 (16 * 4) to 12 (4 * 3).
+  // We create an array of 4 corners and directly initialize the first 3 with the matrix multiplication result of the respective corner.
+  // This causes the construction of the vector arrays contents in-place for optimization.
+  // We place the coords into the array in clockwise order, so we know opposite corners are always i + 2 from corner i.
+  // We skip the 4th corner here as we can calculate that from the other 3, bypassing matrix multiplication.
+  // Note: The below transform methods use a fast (2D) matrix multiply (only 4 multiplications are done).
+  Vector2 corners[4]{ Transform2D( mModelViewMatrix, -halfActorX, -halfActorY ),
+                      Transform2D( mModelViewMatrix,  halfActorX, -halfActorY ),
+                      Transform2D( mModelViewMatrix,  halfActorX,  halfActorY ) };
+
+  // As we are dealing with a rectangle, we can do a fast calculation to get the 4th corner from knowing the other 3 (even if rotated).
+  corners[3] = Vector2( corners[0] + ( corners[2] - corners[1] ) );
+
+  // Calculate the AABB:
+  // We use knowledge that opposite corners will be the max/min of each other. Doing this reduces the normal 12 branching comparisons to 3.
+  // The standard equivalent min/max code of the below would be:
+  //       Vector2 AABBmax( std::max( corners[0].x, std::max( corners[1].x, std::max( corners[3].x, corners[2].x ) ) ),
+  //                        std::max( corners[0].y, std::max( corners[1].y, std::max( corners[3].y, corners[2].y ) ) ) );
+  //       Vector2 AABBmin( std::min( corners[0].x, std::min( corners[1].x, std::min( corners[3].x, corners[2].x ) ) ),
+  //                        std::min( corners[0].y, std::min( corners[1].y, std::min( corners[3].y, corners[2].y ) ) ) );
+  unsigned int smallestX = 0u;
+  // Loop 3 times to find the index of the smallest X value.
+  // Note: We deliberately do NOT unroll the code here as this hampers the compilers output.
+  for( unsigned int i = 1u; i < 4u; ++i )
+  {
+    if( corners[i].x < corners[smallestX].x )
+    {
+      smallestX = i;
+    }
+  }
+
+  // As we are dealing with a rectangle, we can assume opposite corners are the largest.
+  // So without doing min/max branching, we can fetch the min/max values of all the remaining X/Y coords from this one index.
+  Vector4 aabb( corners[smallestX].x, corners[( smallestX + 3u ) % 4].y, corners[( smallestX + 2u ) % 4].x, corners[( smallestX + 1u ) % 4].y );
+
+  // Convert maximums to extents.
+  aabb.z -= aabb.x;
+  aabb.w -= aabb.y;
+
+  // Return the AABB in screen-space pixels (x, y, width, height).
+  // Note: This is a algebraic simplification of: ( viewport.x - aabb.width ) / 2 - ( ( aabb.width / 2 ) + aabb.x ) per axis.
+  return ClippingBox( ( viewportWidth / 2 ) - aabb.z - aabb.x, ( viewportHeight / 2 ) - aabb.w - aabb.y, aabb.z, aabb.w );
+}
+
 void RenderItem::operator delete( void* ptr )
 {
   gRenderItemPool.Free( static_cast<RenderItem*>( ptr ) );
 }
 
+
 } // namespace SceneGraph
 
 } // namespace Internal