srgb conversion needs to be in unpremul

Bug: skia:
Change-Id: Ic7dffb2cb30aae33a6c127ab10ea4282e1360114
Reviewed-on: https://skia-review.googlesource.com/21536
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/gm/srgb.cpp b/gm/srgb.cpp
new file mode 100644
index 0000000000..bbf0abddec
--- /dev/null
+++ b/gm/srgb.cpp
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "sk_tool_utils.h"
+#include "SkCanvas.h"
+#include "SkImage.h"
+#include "Resources.h"
+#include "SkColorFilter.h"
+
+DEF_SIMPLE_GM(srgb_colorfilter, canvas, 512, 256*3) {
+    auto img = GetResourceAsImage("mandrill_256.png");
+
+    const float array[] = {
+        1, 0, 0, 0, 0,
+        0, 1, 0, 0, 0,
+        0, 0, 1, 0, 0,
+        -1, 0, 0, 1, 0,
+    };
+    auto cf0 = SkColorFilter::MakeMatrixFilterRowMajor255(array);
+    auto cf1 = SkColorFilter::MakeLinearToSRGBGamma();
+    auto cf2 = SkColorFilter::MakeSRGBToLinearGamma();
+
+    SkPaint p;
+    p.setColorFilter(cf0);
+    canvas->drawImage(img, 0, 0, nullptr);
+    canvas->drawImage(img, 256, 0, &p);
+
+    p.setColorFilter(cf1);
+    canvas->drawImage(img, 0, 256, &p);
+    p.setColorFilter(SkColorFilter::MakeComposeFilter(cf1, cf0));
+    canvas->drawImage(img, 256, 256, &p);
+
+    p.setColorFilter(cf2);
+    canvas->drawImage(img, 0, 512, &p);
+    p.setColorFilter(SkColorFilter::MakeComposeFilter(cf2, cf0));
+    canvas->drawImage(img, 256, 512, &p);
+}