[rlottie] Added setDrawRegion api to Surface for supporting subsurface rendering.

Change-Id: Ia0d740625858931116103303e1eb398d7f7a00fa

diff --git a/inc/rlottie.h b/inc/rlottie.h
index 135ab53..af26d87 100644 (file)
--- a/inc/rlottie.h
+++ b/inc/rlottie.h
@@ -68,6 +68,24 @@ public:
     Surface(uint32_t *buffer, size_t width, size_t height, size_t bytesPerLine);
 
     /**
+     *  @brief Sets the Draw Area available on the Surface.
+     *
+     *  Lottie will use the draw region size to generate frame image
+     *  and will update only the draw rgion of the surface.
+     *
+     *  @param[in] x      region area x position.
+     *  @param[in] y      region area y position.
+     *  @param[in] width  region area width.
+     *  @param[in] height region area height.
+     *
+     *  @note Default surface format is ARGB32_Premultiplied.
+     *  @note Default draw region area is [ 0 , 0, surface width , surface height]
+     *
+     *  @internal
+     */
+    void setDrawRegion(size_t x, size_t y, size_t width, size_t height);
+
+    /**
      *  @brief Returns width of the surface.
      *
      *  @return surface width
@@ -105,6 +123,51 @@ public:
     uint32_t *buffer() const {return mBuffer;}
 
     /**
+     *  @brief Returns drawable area width of the surface.
+     *
+     *  @return drawable area width
+     *
+     *  @note Default value is width() of the surface
+     *
+     *  @internal
+     *
+     */
+    size_t drawRegionWidth() const {return mDrawArea.w;}
+
+    /**
+     *  @brief Returns drawable area height of the surface.
+     *
+     *  @return drawable area height
+     *
+     *  @note Default value is height() of the surface
+     *
+     *  @internal
+     */
+    size_t drawRegionHeight() const {return mDrawArea.h;}
+
+    /**
+     *  @brief Returns drawable area's x position of the surface.
+     *
+     *  @return drawable area's x potition.
+     *
+     *  @note Default value is 0
+     *
+     *  @internal
+     */
+    size_t drawRegionPosX() const {return mDrawArea.x;}
+
+    /**
+     *  @brief Returns drawable area's y position of the surface.
+     *
+     *  @return drawable area's y potition.
+     *
+     *  @note Default value is 0
+     *
+     *  @internal
+     */
+    size_t drawRegionPosY() const {return mDrawArea.x;}
+
+    /**
      *  @brief Default constructor.
      */
     Surface() = default;
@@ -113,6 +176,12 @@ private:
     size_t       mWidth{0};
     size_t       mHeight{0};
     size_t       mBytesPerLine{0};
+    struct {
+        size_t   x{0};
+        size_t   y{0};
+        size_t   w{0};
+        size_t   h{0};
+    }mDrawArea;
 };
 
 class LOT_EXPORT Animation {
@@ -136,6 +205,7 @@ public:
      *
      *  @param[in] jsonData The JSON string data.
      *  @param[in] key the string that will be used to cache the JSON string data.
+     *  @param[in] resourcePath the path will be used to search for external resource.
      *
      *  @return Animation object that can render the contents of the
      *          Lottie resource represented by JSON string data.

diff --git a/src/lottie/lottieanimation.cpp b/src/lottie/lottieanimation.cpp
index bc86d4b..6c8bef6 100644 (file)
--- a/src/lottie/lottieanimation.cpp
+++ b/src/lottie/lottieanimation.cpp
@@ -89,7 +89,7 @@ Surface AnimationImpl::render(size_t frameNo, const Surface &surface)
       }
 
     mRenderInProgress.store(true);
-    update(frameNo, VSize(surface.width(), surface.height()));
+    update(frameNo, VSize(surface.drawRegionWidth(), surface.drawRegionHeight()));
     mCompItem->render(surface);
     mRenderInProgress.store(false);
 
@@ -289,9 +289,22 @@ Surface::Surface(uint32_t *buffer,
                 :mBuffer(buffer),
                  mWidth(width),
                  mHeight(height),
-                 mBytesPerLine(bytesPerLine) {}
+                 mBytesPerLine(bytesPerLine)
+{
+    mDrawArea.w = mWidth;
+    mDrawArea.h = mHeight;
+}
 
+void Surface::setDrawRegion(size_t x, size_t y, size_t width, size_t height)
+{
+    if ((x + width > mWidth) ||
+        (y + height > mHeight)) return;
 
+    mDrawArea.x = x;
+    mDrawArea.y = y;
+    mDrawArea.w = width;
+    mDrawArea.h = height;
+}
 void initLogging()
 {
 #if defined(__ARM_NEON__)