[core] add raster-dem source type and hillshade layer type (#10642)

1 files changed, 48 insertions, 0 deletions

diff --git a/src/mbgl/geometry/dem_data.hpp b/src/mbgl/geometry/dem_data.hpp
new file mode 100644
index 0000000000..507a51661d
--- /dev/null
+++ b/src/mbgl/geometry/dem_data.hpp
@@ -0,0 +1,48 @@
+#pragma once
+
+#include <mbgl/math/clamp.hpp>
+#include <mbgl/util/image.hpp>
+
+#include <memory>
+#include <array>
+#include <cassert>
+#include <vector>
+
+namespace mbgl {
+
+class DEMData {
+public:
+    DEMData(const PremultipliedImage& image);
+    void backfillBorder(const DEMData& borderTileData, int8_t dx, int8_t dy);
+
+    void set(const int32_t x, const int32_t y, const int32_t value) {
+        reinterpret_cast<int32_t*>(image.data.get())[idx(x, y)] = value + 65536;
+    }
+
+    int32_t get(const int32_t x, const int32_t y) const {
+        return reinterpret_cast<const int32_t*>(image.data.get())[idx(x, y)] - 65536;
+    }
+
+    const PremultipliedImage* getImage() const {
+        return &image;
+    }
+
+    const int32_t dim;
+    const int32_t border;
+    const int32_t stride;
+
+
+    private:
+        PremultipliedImage image;
+
+        size_t idx(const int32_t x, const int32_t y) const {
+            assert(x >= -border);
+            assert(x < dim + border);
+            assert(y >= -border);
+            assert(y < dim + border);
+            return (y + border) * stride + (x + border);
+        }
+
+};
+
+} // namespace mbgl