Always unpremul nonlinearly before writing PNGs in DM

Makes gl and glsrgb agree on several more GMs.

Bug: skia:
Change-Id: I6c233742c188e4f29212f0e9e1281a214457d458
Reviewed-on: https://skia-review.googlesource.com/139765
Auto-Submit: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/dm/DM.cpp b/dm/DM.cpp
index 4656381c13..b8714d3fd9 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -1035,8 +1035,7 @@ static bool dump_png(SkBitmap bitmap, const char* path, const char* md5) {
     options.fComments         = SkDataTable::MakeCopyArrays((const void**)comments, lengths, 4);
     options.fFilterFlags      = SkPngEncoder::FilterFlag::kNone;
     options.fZLibLevel        = 1;
-    options.fUnpremulBehavior = pm.colorSpace() ? SkTransferFunctionBehavior::kRespect
-                                                : SkTransferFunctionBehavior::kIgnore;
+    options.fUnpremulBehavior = SkTransferFunctionBehavior::kIgnore;
     return SkPngEncoder::Encode(&dst, pm, options);
 }