commit 1c86b635d8175dfa15f83f2ca37f628583cbf6f1
author Brian Salomon <bsalomon@google.com> Fri Dec 11 12:36:01 2020 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Fri Dec 11 18:43:20 2020 +0000
tree fdb3a61af0200ee76a56b7384d5be6aab8f6575a
parent 62a683e476560e012ecd763712ea1a014449d202

Improve clamp mode in GPU blur with downsampling.

This ensures that if the original src had transparent-black in the
border pixels that our downsampled image does as well. Otherwise,
clamp mode causes these nonzero border pixels to produce vertical
/horizontal smears at the edges of the result.

Bug: chromium:1156804

Change-Id: Id2c3a66de29724db2fcc7954abf7f14937cfb76d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/343111
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>

src/gpu/GrSurfaceContext.h

diff --git a/src/gpu/GrSurfaceContext.h b/src/gpu/GrSurfaceContext.h
index b25d849..5096d2c 100644
--- a/src/gpu/GrSurfaceContext.h
+++ b/src/gpu/GrSurfaceContext.h
@@ -173,6 +173,16 @@
                                                   SkImage::RescaleGamma,
                                                   SkFilterQuality);
 
+    /**
+     * Like the above but allows the caller ot specify a destination render target context and
+     * rect within that context. The dst rect must be contained by the dst or this will fail.
+     */
+    bool rescaleInto(GrSurfaceDrawContext* dst,
+                     SkIRect dstRect,
+                     SkIRect srcRect,
+                     SkImage::RescaleGamma,
+                     SkFilterQuality);
+
     GrAuditTrail* auditTrail();
 
 #if GR_TEST_UTILS