move MapContext to its own file

src/mbgl/map/map_context.cpp

@@ -0,0 +1,27 @@
+#include <mbgl/map/map_context.hpp>
+#include <mbgl/map/environment.hpp>
+
+#include <mbgl/renderer/painter.hpp>
+
+#include <mbgl/text/glyph_store.hpp>
+
+#include <mbgl/geometry/glyph_atlas.hpp>
+#include <mbgl/geometry/sprite_atlas.hpp>
+#include <mbgl/geometry/line_atlas.hpp>
+
+#include <mbgl/util/std.hpp>
+#include <mbgl/util/uv_detail.hpp>
+#include <mbgl/util/texture_pool.hpp>
+
+namespace mbgl {
+
+MapContext::MapContext(Environment& env)
+    : glyphStore(util::make_unique<GlyphStore>(env)),
+      glyphAtlas(util::make_unique<GlyphAtlas>(1024, 1024)),
+      spriteAtlas(util::make_unique<SpriteAtlas>(512, 512)),
+      lineAtlas(util::make_unique<LineAtlas>(512, 512)),
+      texturePool(util::make_unique<TexturePool>()),
+      painter(util::make_unique<Painter>(*spriteAtlas, *glyphAtlas, *lineAtlas)) {
+}
+
+}