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* Copyright 2017 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkPngPriv_DEFINED
#define SkPngPriv_DEFINED
#include "include/core/SkTypes.h"
// We store kAlpha_8 images as GrayAlpha in png. Our private signal is significant bits for gray.
// If that is set to 1, we assume the gray channel can be ignored, and we output just alpha.
// We tried 0 at first, but png doesn't like a 0 sigbit for a channel it expects, hence we chose 1.
static constexpr int kGraySigBit_GrayAlphaIsJustAlpha = 1;