[core] Add TransformState::getCameraOptions()

5 files changed, 34 insertions, 7 deletions

diff --git a/platform/default/mbgl/gl/headless_frontend.cpp b/platform/default/mbgl/gl/headless_frontend.cpp
index 4263d2b148..c87a2796c9 100644
--- a/platform/default/mbgl/gl/headless_frontend.cpp
+++ b/platform/default/mbgl/gl/headless_frontend.cpp
@@ -55,6 +55,14 @@ RendererBackend* HeadlessFrontend::getBackend() {
     return &backend;
 }
 
+CameraOptions HeadlessFrontend::getCameraOptions() {
+    if (updateParameters)
+        return RendererState::getCameraOptions(*updateParameters);
+
+    static CameraOptions nullCamera;
+    return nullCamera;
+}
+
 void HeadlessFrontend::setSize(Size size_) {
     if (size != size_) {
         size = size_;
diff --git a/platform/default/mbgl/gl/headless_frontend.hpp b/platform/default/mbgl/gl/headless_frontend.hpp
index 8ae617d37b..29ab30c93d 100644
--- a/platform/default/mbgl/gl/headless_frontend.hpp
+++ b/platform/default/mbgl/gl/headless_frontend.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <mbgl/map/camera.hpp>
 #include <mbgl/renderer/mode.hpp>
 #include <mbgl/renderer/renderer_frontend.hpp>
 #include <mbgl/gl/headless_backend.hpp>
@@ -32,6 +33,7 @@ public:
 
     Renderer* getRenderer();
     RendererBackend* getBackend();
+    CameraOptions getCameraOptions();
 
     PremultipliedImage readStillImage();
     PremultipliedImage render(Map&);
diff --git a/src/mbgl/map/transform.cpp b/src/mbgl/map/transform.cpp
index 21f1b70c42..0d633499cf 100644
--- a/src/mbgl/map/transform.cpp
+++ b/src/mbgl/map/transform.cpp
@@ -64,13 +64,7 @@ void Transform::resize(const Size size) {
 #pragma mark - Camera
 
 CameraOptions Transform::getCameraOptions(const EdgeInsets& padding) const {
-    CameraOptions camera;
-    camera.center = getLatLng(padding);
-    camera.padding = padding;
-    camera.zoom = getZoom();
-    camera.angle = getAngle();
-    camera.pitch = getPitch();
-    return camera;
+    return state.getCameraOptions(padding);
 }
 
 /**
diff --git a/src/mbgl/map/transform_state.cpp b/src/mbgl/map/transform_state.cpp
index 5cbd307698..4de795d469 100644
--- a/src/mbgl/map/transform_state.cpp
+++ b/src/mbgl/map/transform_state.cpp
@@ -130,6 +130,26 @@ ViewportMode TransformState::getViewportMode() const {
     return viewportMode;
 }
 
+#pragma mark - Camera options
+
+CameraOptions TransformState::getCameraOptions(const EdgeInsets& padding) const {
+    CameraOptions camera;
+
+    if (padding.isFlush()) {
+        camera.center = getLatLng();
+    } else {
+        ScreenCoordinate point = padding.getCenter(size.width, size.height);
+        point.y = size.height - point.y;
+        camera.center = screenCoordinateToLatLng(point).wrapped();
+    }
+    camera.padding = padding;
+    camera.zoom = getZoom();
+    camera.angle = -angle * util::RAD2DEG;
+    camera.pitch = pitch * util::RAD2DEG;
+
+    return camera;
+}
+
 #pragma mark - Position
 
 LatLng TransformState::getLatLng(LatLng::WrapMode wrapMode) const {
diff --git a/src/mbgl/map/transform_state.hpp b/src/mbgl/map/transform_state.hpp
index b6f8ae4424..4049965618 100644
--- a/src/mbgl/map/transform_state.hpp
+++ b/src/mbgl/map/transform_state.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <mbgl/map/mode.hpp>
+#include <mbgl/map/camera.hpp>
 #include <mbgl/util/geo.hpp>
 #include <mbgl/util/geometry.hpp>
 #include <mbgl/util/constants.hpp>
@@ -40,6 +41,8 @@ public:
     // Viewport mode
     ViewportMode getViewportMode() const;
 
+    CameraOptions getCameraOptions(const EdgeInsets&) const;
+
     // Position
     LatLng getLatLng(LatLng::WrapMode = LatLng::Unwrapped) const;
     double pixel_x() const;