[core] Add DDS support for {text,icon}-size (#8593)

* Update gl-js and generate style code

* Factor out packUint8Pair() helper function

* Draft implementation of DDS for {text,icon}-size

Ports https://github.com/mapbox/mapbox-gl-js/pull/4455

* Fix text-size/composite-function-line-placement test

* Refactor to PaintPropertyBinders-like strategy

* Dedupe gl::Program construction

* Use exponential function base for interpolation

* Dedupe coveringZoomStops method

* Fixup tests

* Fix CI errors (hidden within #if block)

1 files changed, 216 insertions, 0 deletions

diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/SymbolLayerTest.java b/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/SymbolLayerTest.java
index e8af375d66..d81965f2c9 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/SymbolLayerTest.java
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/testapp/style/SymbolLayerTest.java
@@ -383,6 +383,114 @@ public class SymbolLayerTest extends BaseStyleTest {
 
 
   @Test
+  public void testIconSizeAsIdentitySourceFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("icon-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      iconSize(property("FeaturePropertyA", Stops.<Float>identity()))
+    );
+
+    // Verify
+    assertNotNull(layer.getIconSize());
+    assertNotNull(layer.getIconSize().getFunction());
+    assertEquals(SourceFunction.class, layer.getIconSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((SourceFunction) layer.getIconSize().getFunction()).getProperty());
+    assertEquals(IdentityStops.class, layer.getIconSize().getFunction().getStops().getClass());
+  }
+
+  @Test
+  public void testIconSizeAsExponentialSourceFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("icon-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      iconSize(
+        property(
+          "FeaturePropertyA",
+          exponential(
+            stop(0.3f, iconSize(0.3f))
+          ).withBase(0.5f)
+        )
+      )
+    );
+
+    // Verify
+    assertNotNull(layer.getIconSize());
+    assertNotNull(layer.getIconSize().getFunction());
+    assertEquals(SourceFunction.class, layer.getIconSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((SourceFunction) layer.getIconSize().getFunction()).getProperty());
+    assertEquals(ExponentialStops.class, layer.getIconSize().getFunction().getStops().getClass());
+  }
+
+  @Test
+  public void testIconSizeAsCategoricalSourceFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("icon-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      iconSize(
+        property(
+          "FeaturePropertyA",
+          categorical(
+            stop(1.0f, iconSize(0.3f))
+          )
+        ).withDefaultValue(iconSize(0.3f))
+      )
+    );
+
+    // Verify
+    assertNotNull(layer.getIconSize());
+    assertNotNull(layer.getIconSize().getFunction());
+    assertEquals(SourceFunction.class, layer.getIconSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((SourceFunction) layer.getIconSize().getFunction()).getProperty());
+    assertEquals(CategoricalStops.class, layer.getIconSize().getFunction().getStops().getClass());
+    assertNotNull(((SourceFunction) layer.getIconSize().getFunction()).getDefaultValue());
+    assertNotNull(((SourceFunction) layer.getIconSize().getFunction()).getDefaultValue().getValue());
+    assertEquals(0.3f, ((SourceFunction) layer.getIconSize().getFunction()).getDefaultValue().getValue());
+  }
+
+  @Test
+  public void testIconSizeAsCompositeFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("icon-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      iconSize(
+        composite(
+          "FeaturePropertyA",
+          exponential(
+            stop(0, 0.3f, iconSize(0.9f))
+          ).withBase(0.5f)
+        ).withDefaultValue(iconSize(0.3f))
+      )
+    );
+
+    // Verify
+    assertNotNull(layer.getIconSize());
+    assertNotNull(layer.getIconSize().getFunction());
+    assertEquals(CompositeFunction.class, layer.getIconSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((CompositeFunction) layer.getIconSize().getFunction()).getProperty());
+    assertEquals(ExponentialStops.class, layer.getIconSize().getFunction().getStops().getClass());
+    assertEquals(1, ((ExponentialStops) layer.getIconSize().getFunction().getStops()).size());
+
+    ExponentialStops<Stop.CompositeValue<Float, Float>, Float> stops =
+      (ExponentialStops<Stop.CompositeValue<Float, Float>, Float>) layer.getIconSize().getFunction().getStops();
+    Stop<Stop.CompositeValue<Float, Float>, Float> stop = stops.iterator().next();
+    assertEquals(0f, stop.in.zoom, 0.001);
+    assertEquals(0.3f, stop.in.value, 0.001f);
+    assertEquals(0.9f, stop.out, 0.001f);
+  }
+
+  @Test
   public void testIconTextFitAsConstant() {
     checkViewIsDisplayed(R.id.mapView);
     Timber.i("icon-text-fit");
@@ -1075,6 +1183,114 @@ public class SymbolLayerTest extends BaseStyleTest {
 
 
   @Test
+  public void testTextSizeAsIdentitySourceFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("text-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      textSize(property("FeaturePropertyA", Stops.<Float>identity()))
+    );
+
+    // Verify
+    assertNotNull(layer.getTextSize());
+    assertNotNull(layer.getTextSize().getFunction());
+    assertEquals(SourceFunction.class, layer.getTextSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((SourceFunction) layer.getTextSize().getFunction()).getProperty());
+    assertEquals(IdentityStops.class, layer.getTextSize().getFunction().getStops().getClass());
+  }
+
+  @Test
+  public void testTextSizeAsExponentialSourceFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("text-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      textSize(
+        property(
+          "FeaturePropertyA",
+          exponential(
+            stop(0.3f, textSize(0.3f))
+          ).withBase(0.5f)
+        )
+      )
+    );
+
+    // Verify
+    assertNotNull(layer.getTextSize());
+    assertNotNull(layer.getTextSize().getFunction());
+    assertEquals(SourceFunction.class, layer.getTextSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((SourceFunction) layer.getTextSize().getFunction()).getProperty());
+    assertEquals(ExponentialStops.class, layer.getTextSize().getFunction().getStops().getClass());
+  }
+
+  @Test
+  public void testTextSizeAsCategoricalSourceFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("text-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      textSize(
+        property(
+          "FeaturePropertyA",
+          categorical(
+            stop(1.0f, textSize(0.3f))
+          )
+        ).withDefaultValue(textSize(0.3f))
+      )
+    );
+
+    // Verify
+    assertNotNull(layer.getTextSize());
+    assertNotNull(layer.getTextSize().getFunction());
+    assertEquals(SourceFunction.class, layer.getTextSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((SourceFunction) layer.getTextSize().getFunction()).getProperty());
+    assertEquals(CategoricalStops.class, layer.getTextSize().getFunction().getStops().getClass());
+    assertNotNull(((SourceFunction) layer.getTextSize().getFunction()).getDefaultValue());
+    assertNotNull(((SourceFunction) layer.getTextSize().getFunction()).getDefaultValue().getValue());
+    assertEquals(0.3f, ((SourceFunction) layer.getTextSize().getFunction()).getDefaultValue().getValue());
+  }
+
+  @Test
+  public void testTextSizeAsCompositeFunction() {
+    checkViewIsDisplayed(R.id.mapView);
+    Timber.i("text-size");
+    assertNotNull(layer);
+
+    // Set
+    layer.setProperties(
+      textSize(
+        composite(
+          "FeaturePropertyA",
+          exponential(
+            stop(0, 0.3f, textSize(0.9f))
+          ).withBase(0.5f)
+        ).withDefaultValue(textSize(0.3f))
+      )
+    );
+
+    // Verify
+    assertNotNull(layer.getTextSize());
+    assertNotNull(layer.getTextSize().getFunction());
+    assertEquals(CompositeFunction.class, layer.getTextSize().getFunction().getClass());
+    assertEquals("FeaturePropertyA", ((CompositeFunction) layer.getTextSize().getFunction()).getProperty());
+    assertEquals(ExponentialStops.class, layer.getTextSize().getFunction().getStops().getClass());
+    assertEquals(1, ((ExponentialStops) layer.getTextSize().getFunction().getStops()).size());
+
+    ExponentialStops<Stop.CompositeValue<Float, Float>, Float> stops =
+      (ExponentialStops<Stop.CompositeValue<Float, Float>, Float>) layer.getTextSize().getFunction().getStops();
+    Stop<Stop.CompositeValue<Float, Float>, Float> stop = stops.iterator().next();
+    assertEquals(0f, stop.in.zoom, 0.001);
+    assertEquals(0.3f, stop.in.value, 0.001f);
+    assertEquals(0.9f, stop.out, 0.001f);
+  }
+
+  @Test
   public void testTextMaxWidthAsConstant() {
     checkViewIsDisplayed(R.id.mapView);
     Timber.i("text-max-width");