Tests: Add a basic ICC profile test

icc-v4.jpg is Meta/Websites/serenityos.org/happy/3rd/bgianf.jpg.
There are a whole bunch of jpgs with v4 color profiles and I just picked
one fairly arbitrarily. It looks like a fairly standard v4 matrix
profile that in this form is also present in many jpgs taken by mobile
phone cameras. It uses parametric curves.

icc-v2.png is based on ./Documentation/WebServer_localhost.jpg since
that is the only image in the repo with a v2 color profile. It also has
all kinds of interesting and somewhat exotic tags, such as an 'dscm' (an
Apple extension to have a description of type 'mluc', since normal
'desc' is required ot have type 'desc' in v2 files -- in v4, 'desc' has
type 'mluc') tag of type 'mluc' that actually contains data in several
languages and that exercises the non-BMP UTF-16BE decoder. It's however
still also a fairly standard v2 matrix profile, which uses 'curv'
instead of 'para' for its curves ('para' is v4-only).

I converted that jpeg file to png, and cropped most of the image
data to save on file size by running:

    sips -s format png --cropToHeightWidth 21 42 in.jpg --out out.png

Tests/LibGfx/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(TEST_SOURCES
     BenchmarkGfxPainter.cpp
     TestFontHandling.cpp
+    TestICCProfile.cpp
     TestImageDecoder.cpp
 )
 

Tests/LibGfx/TestICCProfile.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2023, Nico Weber <thakis@chromium.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/MappedFile.h>
+#include <LibGfx/ICC/Profile.h>
+#include <LibGfx/JPGLoader.h>
+#include <LibGfx/PNGLoader.h>
+#include <LibTest/TestCase.h>
+
+#ifdef AK_OS_SERENITY
+#    define TEST_INPUT(x) ("/usr/Tests/LibGfx/test-inputs/" x)
+#else
+#    define TEST_INPUT(x) ("test-inputs/" x)
+#endif
+
+TEST_CASE(png)
+{
+    auto file = MUST(Core::MappedFile::map(TEST_INPUT("icc-v2.png"sv)));
+    auto png = MUST(Gfx::PNGImageDecoderPlugin::create(file->bytes()));
+    EXPECT(png->initialize());
+    auto icc_bytes = MUST(png->icc_data());
+    EXPECT(icc_bytes.has_value());
+
+    auto icc_profile = MUST(Gfx::ICC::Profile::try_load_from_externally_owned_memory(icc_bytes.value()));
+    EXPECT(icc_profile->is_v2());
+}
+
+TEST_CASE(jpg)
+{
+    auto file = MUST(Core::MappedFile::map(TEST_INPUT("icc-v4.jpg"sv)));
+    auto jpg = MUST(Gfx::JPGImageDecoderPlugin::create(file->bytes()));
+    EXPECT(jpg->initialize());
+    auto icc_bytes = MUST(jpg->icc_data());
+    EXPECT(icc_bytes.has_value());
+
+    auto icc_profile = MUST(Gfx::ICC::Profile::try_load_from_externally_owned_memory(icc_bytes.value()));
+    EXPECT(icc_profile->is_v4());
+}