[core, macos, ios] Unit tests for LocalGlyphRasterizer

Core test uses stubbed "glyph.pbf" without Chinese glyphs
Darwin test relies on locally available "PingFang" font.
Android test relies on locally available "Droid" font. 'expected.png' is NOT correct b/c I haven't figured out how to run unit tests on Android yet.

5 files changed, 282 insertions, 0 deletions

diff --git a/test/fixtures/local_glyphs/droid/expected.png b/test/fixtures/local_glyphs/droid/expected.png
new file mode 100644
index 0000000000..c0ba43bf11
--- /dev/null
+++ b/test/fixtures/local_glyphs/droid/expected.png
diff --git a/test/fixtures/local_glyphs/mixed.json b/test/fixtures/local_glyphs/mixed.json
new file mode 100644
index 0000000000..e07d429753
--- /dev/null
+++ b/test/fixtures/local_glyphs/mixed.json
@@ -0,0 +1,196 @@
+{
+  "version": 8,
+  "zoom": 0,
+  "center": [-14.41400, 39.09187],
+  "sources": {
+    "mapbox": {
+      "type": "geojson",
+      "data": {
+        "type": "FeatureCollection",
+        "features": [
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "身什戰 1"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.4195556640625,
+                  39.091699613104595
+                ],
+                [
+                  102.3046875,
+                  39.36827914916014
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "two 身什戰"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.403076171875,
+                  39.10022600175347
+                ],
+                [
+                  103.35937499999999,
+                  65.80277639340238
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "身什戰33"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.414062499999998,
+                  39.091699613104595
+                ],
+                [
+                  -14.765625,
+                  82.21421714106776
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "身什戰"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.408569335937498,
+                  39.091699613104595
+                ],
+                [
+                  -130.78125,
+                  39.095962936305476
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "身什戰 five"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.414062499999998,
+                  39.095962936305476
+                ],
+                [
+                  -16.5234375,
+                  -58.81374171570779
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "six 身什戰"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.4195556640625,
+                  39.10022600175347
+                ],
+                [
+                  -130.4296875,
+                  64.47279382008166
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "身什戰 seven"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.4195556640625,
+                  39.0831721934762
+                ],
+                [
+                  33.75,
+                  81.87364125482827
+                ]
+              ]
+            }
+          },
+          {
+            "type": "Feature",
+            "properties": {
+              "name": "eight 身什戰"
+            },
+            "geometry": {
+              "type": "LineString",
+              "coordinates": [
+                [
+                  -14.447021484374998,
+                  39.104488809440475
+                ],
+                [
+                  -66.4453125,
+                  82.26169873683153
+                ]
+              ]
+            }
+          }
+        ]
+      }
+    }
+  },
+  "glyphs": "local://glyphs/{fontstack}/{range}.pbf",
+  "layers": [
+    {
+      "id": "background",
+      "type": "background",
+      "paint": {
+        "background-color": "white"
+      }
+    },
+    {
+      "id": "lines-symbol",
+      "type": "symbol",
+      "source": "mapbox",
+      "layout": {
+        "text-field": "{name}",
+        "symbol-placement": "line",
+        "symbol-spacing": 150,
+        "text-allow-overlap": true,
+        "text-font": [ "NotoCJK" ]
+      }
+    }, {
+      "id": "lines",
+      "type": "line",
+      "source": "mapbox",
+      "paint": {
+          "line-opacity": 0.25
+      }
+    }
+  ]
+}
diff --git a/test/fixtures/local_glyphs/no_local/expected.png b/test/fixtures/local_glyphs/no_local/expected.png
new file mode 100644
index 0000000000..c7b1b828ee
--- /dev/null
+++ b/test/fixtures/local_glyphs/no_local/expected.png
diff --git a/test/fixtures/local_glyphs/ping_fang/expected.png b/test/fixtures/local_glyphs/ping_fang/expected.png
new file mode 100644
index 0000000000..c0ba43bf11
--- /dev/null
+++ b/test/fixtures/local_glyphs/ping_fang/expected.png
diff --git a/test/text/local_glyph_rasterizer.test.cpp b/test/text/local_glyph_rasterizer.test.cpp
new file mode 100644
index 0000000000..a77083a5d8
--- /dev/null
+++ b/test/text/local_glyph_rasterizer.test.cpp
@@ -0,0 +1,86 @@
+#include <mbgl/test/util.hpp>
+#include <mbgl/test/stub_file_source.hpp>
+#include <mbgl/map/map.hpp>
+#include <mbgl/util/io.hpp>
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/color.hpp>
+#include <mbgl/renderer/renderer.hpp>
+#include <mbgl/gl/headless_frontend.hpp>
+#include <mbgl/util/default_thread_pool.hpp>
+#include <mbgl/style/style.hpp>
+
+using namespace mbgl;
+
+namespace {
+
+class LocalGlyphRasterizerTest {
+public:
+    LocalGlyphRasterizerTest(const optional<std::string> fontFamily)
+        : frontend(pixelRatio, fileSource, threadPool, optional<std::string>(), GLContextMode::Unique, fontFamily)
+    {
+    }
+
+    util::RunLoop loop;
+    StubFileSource fileSource;
+    ThreadPool threadPool { 4 };
+    float pixelRatio { 1 };
+    HeadlessFrontend frontend;
+    Map map { frontend, MapObserver::nullObserver(), frontend.getSize(), pixelRatio, fileSource,
+              threadPool, MapMode::Static};
+
+    void checkRendering(const char * name) {
+        test::checkImage(std::string("test/fixtures/local_glyphs/") + name,
+                         frontend.render(map), 0.0002, 0.1);
+    }
+};
+
+} // end namespace
+
+#ifdef __APPLE__
+
+TEST(LocalGlyphRasterizer, PingFang) {
+    LocalGlyphRasterizerTest test(std::string("PingFang"));
+
+    test.fileSource.glyphsResponse = [&] (const Resource& resource) {
+        EXPECT_EQ(Resource::Kind::Glyphs, resource.kind);
+        Response response;
+        response.data = std::make_shared<std::string>(util::read_file("test/fixtures/resources/glyphs.pbf"));
+        return response;
+    };
+    test.map.getStyle().loadJSON(util::read_file("test/fixtures/local_glyphs/mixed.json"));
+    test.checkRendering("ping_fang");
+}
+
+#endif
+
+TEST(LocalGlyphRasterizer, NoLocal) {
+    // Expectation: without any local fonts set, and without any CJK glyphs provided,
+    // the output should just contain basic latin characters.
+    LocalGlyphRasterizerTest test({});
+
+    test.fileSource.glyphsResponse = [&] (const Resource& resource) {
+        EXPECT_EQ(Resource::Kind::Glyphs, resource.kind);
+        Response response;
+        response.data = std::make_shared<std::string>(util::read_file("test/fixtures/resources/glyphs.pbf"));
+        return response;
+    };
+    test.map.getStyle().loadJSON(util::read_file("test/fixtures/local_glyphs/mixed.json"));
+    test.checkRendering("no_local");
+}
+
+#if ANDROID
+
+TEST(LocalGlyphRasterizer, Droid) {
+    LocalGlyphRasterizerTest test(std::string("Droid"));
+
+    test.fileSource.glyphsResponse = [&] (const Resource& resource) {
+        EXPECT_EQ(Resource::Kind::Glyphs, resource.kind);
+        Response response;
+        response.data = std::make_shared<std::string>(util::read_file("test/fixtures/resources/glyphs.pbf"));
+        return response;
+    };
+    test.map.getStyle().loadJSON(util::read_file("test/fixtures/local_glyphs/mixed.json"));
+    test.checkRendering("droid");
+}
+
+#endif