[core] Add ImageSource support to style parsers

3 files changed, 158 insertions, 0 deletions

diff --git a/src/mbgl/style/sources/image_source.cpp b/src/mbgl/style/sources/image_source.cpp
new file mode 100644
index 0000000000..4f86befd0b
--- /dev/null
+++ b/src/mbgl/style/sources/image_source.cpp
@@ -0,0 +1,85 @@
+#include <mbgl/style/sources/image_source.hpp>
+#include <mbgl/style/sources/image_source_impl.hpp>
+#include <mbgl/util/geo.hpp>
+#include <mbgl/style/source_observer.hpp>
+#include <mbgl/util/premultiply.hpp>
+#include <mbgl/storage/file_source.hpp>
+
+namespace mbgl {
+namespace style {
+
+ImageSource::ImageSource(std::string id, const std::vector<LatLng> coords_)
+    : Source(makeMutable<Impl>(std::move(id), coords_)) {
+}
+
+ImageSource::~ImageSource() = default;
+
+const ImageSource::Impl& ImageSource::impl() const {
+    return static_cast<const Impl&>(*baseImpl);
+}
+
+void ImageSource::setCoordinates(const std::vector<LatLng>& coords_) {
+    baseImpl = makeMutable<Impl>(impl(), coords_);
+    observer->onSourceChanged(*this);
+}
+
+std::vector<LatLng> ImageSource::getCoordinates() const {
+    return impl().getCoordinates();
+}
+
+void ImageSource::setURL(const std::string& url_) {
+    url = std::move(url_);
+    // Signal that the source description needs a reload
+    if (loaded || req) {
+        loaded = false;
+        req.reset();
+        observer->onSourceDescriptionChanged(*this);
+    }
+}
+
+void ImageSource::setImage(mbgl::UnassociatedImage image_) {
+    url = {};
+    if (req) {
+        req.reset();
+    }
+    loaded = true;
+    baseImpl = makeMutable<Impl>(impl(), std::move(image_));
+    observer->onSourceChanged(*this);
+}
+
+const std::string& ImageSource::getURL() const {
+    return *url;
+}
+
+void ImageSource::loadDescription(FileSource& fileSource) {
+    if (!url) {
+        loaded = true;
+    }
+
+    if (req ||  loaded) {
+        return;
+    }
+    const Resource imageResource { Resource::Unknown, *url, {}, Resource::Necessity::Required };
+
+    req = fileSource.request(imageResource, [this](Response res) {
+        if (res.error) {
+            observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error(res.error->message)));
+        } else if (res.notModified) {
+            return;
+        } else if (res.noContent) {
+            observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error("unexpectedly empty image url")));
+        } else {
+            try {
+                UnassociatedImage image = util::unpremultiply(decodeImage(*res.data));
+                baseImpl = makeMutable<Impl>(impl(), std::move(image));
+            } catch (...) {
+                observer->onSourceError(*this, std::current_exception());
+            }
+            loaded = true;
+            observer->onSourceLoaded(*this);
+        }
+    });
+}
+
+} // namespace style
+} // namespace mbgl
diff --git a/src/mbgl/style/sources/image_source_impl.cpp b/src/mbgl/style/sources/image_source_impl.cpp
new file mode 100644
index 0000000000..e16b33b4ca
--- /dev/null
+++ b/src/mbgl/style/sources/image_source_impl.cpp
@@ -0,0 +1,42 @@
+#include <mbgl/style/sources/image_source_impl.hpp>
+#include <mbgl/util/geo.hpp>
+
+namespace mbgl {
+namespace style {
+
+ImageSource::Impl::Impl(std::string id_, std::vector<LatLng> coords_)
+    : Source::Impl(SourceType::Image, std::move(id_)),
+    coords(std::move(coords_)) {
+}
+
+ImageSource::Impl::Impl(const Impl& other, std::vector<LatLng> coords_)
+    : Source::Impl(other),
+    coords(std::move(coords_)),
+    image(other.image.clone()) {
+}
+
+ImageSource::Impl::Impl(const Impl& rhs, UnassociatedImage image_)
+    : Source::Impl(rhs),
+    coords(rhs.coords),
+    image(std::move(image_)) {
+}
+ImageSource::Impl::~Impl() = default;
+
+void ImageSource::Impl::setImage(UnassociatedImage image_) {
+    image = std::move(image_);
+}
+
+const UnassociatedImage& ImageSource::Impl::getImage() const {
+    return image;
+}
+
+std::vector<LatLng> ImageSource::Impl::getCoordinates() const {
+    return coords;
+}
+
+optional<std::string> ImageSource::Impl::getAttribution() const {
+    return {};
+}
+
+} // namespace style
+} // namespace mbgl
diff --git a/src/mbgl/style/sources/image_source_impl.hpp b/src/mbgl/style/sources/image_source_impl.hpp
new file mode 100644
index 0000000000..439db4fa64
--- /dev/null
+++ b/src/mbgl/style/sources/image_source_impl.hpp
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <mbgl/style/source_impl.hpp>
+#include <mbgl/style/sources/image_source.hpp>
+#include <mbgl/util/image.hpp>
+
+namespace mbgl {
+class LatLng;
+
+namespace style {
+
+class ImageSource::Impl : public Source::Impl {
+public:
+    Impl(std::string id, std::vector<LatLng> coords);
+    Impl(const Impl& rhs, std::vector<LatLng> coords);
+    Impl(const Impl& rhs, UnassociatedImage image);
+
+    ~Impl() final;
+
+    void setImage(UnassociatedImage );
+    const mbgl::UnassociatedImage& getImage() const;
+    std::vector<LatLng> getCoordinates() const;
+
+    optional<std::string> getAttribution() const final;
+private:
+    std::vector<LatLng> coords;
+    mbgl::UnassociatedImage image;
+};
+
+} // namespace style
+} // namespace mbgl