Fix ScrollView sub node position error when render by RenderTexture.

cocos/2d/CCRenderTexture.cpp

@@ -42,6 +42,8 @@ THE SOFTWARE.
 
 NS_CC_BEGIN
 
+static RenderTexture* g_current = nullptr;
+
 // implementation RenderTexture
 RenderTexture::RenderTexture()
 : _keepMatrix(false)
@@ -206,6 +208,10 @@ RenderTexture * RenderTexture::create(int w, int h)
     return nullptr;
 }
 
+RenderTexture * RenderTexture::current() {
+    return g_current;
+}
+
 bool RenderTexture::initWithWidthAndHeight(int w, int h, Texture2D::PixelFormat eFormat)
 {
     return initWithWidthAndHeight(w, h, eFormat, 0);
@@ -684,8 +690,21 @@ Image* RenderTexture::newImage(bool flipImage)
     return image;
 }
 
+Rect& RenderTexture::getVirtualViewport() {
+    Rect viewport;
+    viewport.size.width = _fullviewPort.size.width;
+    viewport.size.height = _fullviewPort.size.height;
+    float viewPortRectWidthRatio = float(viewport.size.width)/_fullRect.size.width;
+    float viewPortRectHeightRatio = float(viewport.size.height)/_fullRect.size.height;
+    viewport.origin.x = (_fullRect.origin.x - _rtTextureRect.origin.x) * viewPortRectWidthRatio;
+    viewport.origin.y = (_fullRect.origin.y - _rtTextureRect.origin.y) * viewPortRectHeightRatio;
+    return viewport;
+}
+
 void RenderTexture::onBegin()
 {
+    g_current = this;
+
     //
     Director *director = Director::getInstance();
 
@@ -755,6 +774,7 @@ void RenderTexture::onEnd()
     director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, _oldProjMatrix);
     director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, _oldTransMatrix);
 
+    g_current = nullptr;
 }
 
 void RenderTexture::onClear()

cocos/2d/CCRenderTexture.h

@@ -303,6 +303,12 @@ class CC_DLL RenderTexture : public Node
      * @param fullViewport The total viewportSize.
      */
     void setVirtualViewport(const Vec2& rtBegin, const Rect& fullRect, const Rect& fullViewport);
+    /** Get the RenderTexture object visit now.
+     */
+    static RenderTexture * current();
+    /** Get RenderTexture viewport.
+     */	
+    Rect& getVirtualViewport();
 
 public:
     /** FIXME: should be protected.

extensions/GUI/CCScrollView/CCScrollView.cpp

@@ -30,6 +30,8 @@
 #include "2d/CCActionInstant.h"
 #include "2d/CCActionInterval.h"
 #include "2d/CCActionTween.h"
+#include "2d/CCRenderTexture.h"
+#include "2d/CCCamera.h"
 #include "base/CCDirector.h"
 #include "base/CCEventDispatcher.h"
 #include "renderer/CCRenderer.h"
@@ -901,7 +903,17 @@ Rect ScrollView::getViewRect()
         screenPos.y += _viewSize.height*scaleY;
         scaleY = -scaleY;
     }
-
+
+    auto rt = RenderTexture::current();
+    if (rt != nullptr) {
+        auto cam = Camera::getDefaultCamera();
+        auto viewport = cam->getDefaultViewport();
+        auto rect2 = rt->getVirtualViewport();
+
+        screenPos.x = screenPos.x + (rect2.origin.x - viewport._left);
+        screenPos.y = screenPos.y + (rect2.origin.y - viewport._bottom);
+    }
+
     return Rect(screenPos.x, screenPos.y, _viewSize.width*scaleX, _viewSize.height*scaleY);
 }
 NS_CC_EXT_END