Metal: Auto detect parent layer's contentsScale change

Currently when user passes a CALayer to create WindowSurface, Metal back-end will create a child CAMetalLayer to render to. However, when this CALayer's contentsScale is changed, the CAMetalLayer's contentsScale wasn't updated accordingly. This CL fix this. Bug: angleproject:2634 Change-Id: I20411aa8b81a30c6353e595680f1de00a4a24da7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2482407Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Le Hoang Quyen <le.hoang.q@gmail.com>

Metal: Auto detect parent layer's contentsScale change
c90faa71 · Le Hoang Quyen · Commit Bot · 3d6df964 · c90faa71
Commit c90faa71 authored Oct 18, 2020 by Le Hoang Quyen Committed by Commit Bot Oct 20, 2020
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SurfaceMtl.mm src/libANGLE/renderer/metal/SurfaceMtl.mm +6 -0

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--- a/src/libANGLE/renderer/metal/SurfaceMtl.mm
+++ b/src/libANGLE/renderer/metal/SurfaceMtl.mm
@@ -749,6 +749,12 @@ CGSize WindowSurfaceMtl::calcExpectedDrawableSize() const
 bool WindowSurfaceMtl::checkIfLayerResized(const gl::Context *context)
 {
+    if (mMetalLayer.get() != mLayer && mMetalLayer.get().contentsScale != mLayer.contentsScale)
+    {
+        // Parent layer's content scale has changed, update Metal layer's scale factor.
+        mMetalLayer.get().contentsScale = mLayer.contentsScale;
+    }
    CGSize currentLayerDrawableSize = mMetalLayer.get().drawableSize;
    CGSize expectedDrawableSize     = calcExpectedDrawableSize();