Revert of Revert of Add gamma/sRGB tag to SkImageInfo (patchset #1 id:1 of https://codereview.chromium.org/525113005/)

Reason for revert:
Experiment to see resulting failures

Original issue's description:
> Revert of Add gamma/sRGB tag to SkImageInfo (patchset #1 id:1 of https://codereview.chromium.org/522813002/)
>
> Reason for revert:
> seems to be breaking layout tests in roll
>
> Original issue's description:
> > Add gamma/sRGB tag to SkImageInfo
> >
> > This reverts commit 64ba5fa1ff428858f803523257cd862f8b33423b.
> >
> > BUG=skia:
> >
> > Committed: https://skia.googlesource.com/skia/+/c89aa509d6a094bc1b18d73135343819903a9cfb
>
> TBR=reed@google.com
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/b44c1895afae516cb851cd1a0cea83343c354ee4

R=reed@google.com
TBR=reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/532583002

1 files changed, 64 insertions, 0 deletions

diff --git a/tests/ImageInfoTest.cpp b/tests/ImageInfoTest.cpp
new file mode 100644
index 0000000000..679b302ceb
--- /dev/null
+++ b/tests/ImageInfoTest.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkImageInfo.h"
+
+#include "Test.h"
+
+struct ImageInfoRec {
+    int         fWidth;
+    int         fHeight;
+    SkColorType fColorType;
+    SkAlphaType fAlphaType;
+    float       fGamma;
+    bool        fIsSRGB;
+};
+
+static void check_info(skiatest::Reporter* reporter,
+                       const ImageInfoRec& expected, const SkImageInfo& info) {
+    REPORTER_ASSERT(reporter, info.width() == expected.fWidth);
+    REPORTER_ASSERT(reporter, info.height() == expected.fHeight);
+    REPORTER_ASSERT(reporter, info.colorType() == expected.fColorType);
+    REPORTER_ASSERT(reporter, info.alphaType() == expected.fAlphaType);
+    REPORTER_ASSERT(reporter, info.gamma() == expected.fGamma);
+    REPORTER_ASSERT(reporter, info.isSRGB() == expected.fIsSRGB);
+}
+
+DEF_TEST(ImageInfo, reporter) {
+    const float nan = SK_ScalarNaN;
+    const float nice_gamma = 1.5f;
+    const int W = 100;
+    const int H = 200;
+    SkImageInfo info;
+    
+    const ImageInfoRec rec[] = {
+        { 0, 0, kUnknown_SkColorType,   kIgnore_SkAlphaType,   0, false },  // MakeUnknown()
+        { W, H, kUnknown_SkColorType,   kIgnore_SkAlphaType,   0, false },  // MakeUnknown(...)
+        { W, H, kN32_SkColorType,       kPremul_SkAlphaType,   1, false },  // MakeN32Premul(...)
+        { W, H, kN32_SkColorType,       kOpaque_SkAlphaType,   1, false },  // MakeN32(...)
+        { W, H, kAlpha_8_SkColorType,   kPremul_SkAlphaType,   0, false },  // MakeA8()
+        { W, H, kRGBA_8888_SkColorType, kUnpremul_SkAlphaType, 1, false },  // Make()
+        { W, H, kBGRA_8888_SkColorType, kPremul_SkAlphaType,   1, false },  // Make()
+        { W, H, kBGRA_8888_SkColorType, kPremul_SkAlphaType,   0, true },  // MakeSRGB()
+        { W, H, kN32_SkColorType,       kPremul_SkAlphaType,   1, false },  // MakeWithGamma() NaN
+        { W, H, kAlpha_8_SkColorType,   kPremul_SkAlphaType,   0, false },  // MakeWithGamma() bad ct for gamma
+        { W, H, kN32_SkColorType,       kPremul_SkAlphaType,   nice_gamma, false },  // MakeWithGamma() good
+    };
+
+    check_info(reporter, rec[ 0], SkImageInfo::MakeUnknown());
+    check_info(reporter, rec[ 1], SkImageInfo::MakeUnknown(W, H));
+    check_info(reporter, rec[ 2], SkImageInfo::MakeN32Premul(W, H));
+    check_info(reporter, rec[ 3], SkImageInfo::MakeN32(W, H, rec[3].fAlphaType));
+    check_info(reporter, rec[ 4], SkImageInfo::MakeA8(W, H));
+    check_info(reporter, rec[ 5], SkImageInfo::Make(W, H, rec[5].fColorType, rec[5].fAlphaType));
+    check_info(reporter, rec[ 6], SkImageInfo::Make(W, H, rec[6].fColorType, rec[6].fAlphaType));
+    check_info(reporter, rec[ 7], SkImageInfo::MakeSRGB(W, H, rec[7].fColorType, rec[7].fAlphaType));
+    check_info(reporter, rec[ 8], SkImageInfo::MakeWithGamma(W, H, rec[8].fColorType, rec[8].fAlphaType, nan));
+    check_info(reporter, rec[ 9], SkImageInfo::MakeWithGamma(W, H, rec[9].fColorType, rec[9].fAlphaType, nice_gamma));
+    check_info(reporter, rec[10], SkImageInfo::MakeWithGamma(W, H, rec[10].fColorType, rec[10].fAlphaType, rec[10].fGamma));
+}
+