Efl.Canvas.Vg.Container: Prevent duplicate transpacency calculation.

Summary:
If Vg.Container has transparency, this is calculated by _evas_vg_render
in Efl.Canvas.Vg.Object. Therefore, there is no need to propagate
the transparency of the container to the child. _evas_vg_render pre-draws
all children and calculates transparency in batches for avoid duplicate calculation.

Test Plan: N/A

Reviewers: Hermet, kimcinoo, herb

Reviewed By: Hermet

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D11692

1 files changed, 7 insertions, 0 deletions

diff --git a/src/lib/evas/canvas/efl_canvas_vg_container.c b/src/lib/evas/canvas/efl_canvas_vg_container.c
index f791f8160a..37b59405c3 100644
--- a/src/lib/evas/canvas/efl_canvas_vg_container.c
+++ b/src/lib/evas/canvas/efl_canvas_vg_container.c
@@ -212,6 +212,13 @@ _efl_canvas_vg_container_render_pre(Evas_Object_Protected_Data *vg_pd,
         if (flag & EFL_GFX_CHANGE_FLAG_MATRIX)
           child_nd->flags |= EFL_GFX_CHANGE_FLAG_MATRIX;
 
+        // Note: If Vg.Container has transparency, this is calculated by _evas_vg_render in Efl.Canvas.Vg.Object.
+        //       Therefore, there is no need to propagate the transparency of the container to the child.
+        //       However, if there is a composition target, the child must refer to the parent's opacity.
+        //       Because _evas_vg_render does not support opacity calculation for containers that need to be composited.
+        //       These things need to be refactored in a better way later.
+        c_a = !comp ? 255 : c_a;
+
         _evas_vg_render_pre(vg_pd, child,
                             engine, output, context, surface,
                             ctransform, c_a, comp, comp_method);