ninepatch.h

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#ifndef ION_IMAGE_NINEPATCH_H_
#define ION_IMAGE_NINEPATCH_H_

#include "base/integral_types.h"
#include "base/macros.h"
#include "ion/base/stlalloc/allocmap.h"
#include "ion/base/stlalloc/allocvector.h"
#include "ion/external/gtest/gunit_prod.h"
#include "ion/gfx/image.h"
#include "ion/math/range.h"
#include "ion/math/vector.h"

namespace ion {
namespace image {

class ION_API NinePatch : public base::Referent {
 public:
  explicit NinePatch(const gfx::ImagePtr& image);

  const gfx::ImagePtr BuildImage(uint32 width, uint32 height,
                                 const base::AllocatorPtr& alloc) const;

  void SetBuildWipeable(bool wipable) { wipeable_ = wipable; }

  const math::Vector2ui GetMinimumSize() const;

  const math::Range2ui GetPaddingBox(uint32 width, uint32 height) const;

  const math::Vector2ui GetSizeToFitContent(
      uint32 content_width, uint32 content_height) const;

 private:
  struct Region;

  ~NinePatch() override;

  const base::AllocVector<Region> GetRegionsForSize(uint32 width,
                                                    uint32 height) const;

  base::AllocMap<uint32, uint32> regions_h_;
  base::AllocMap<uint32, uint32> regions_v_;
  math::Range2ui padding_;
  gfx::ImagePtr image_;
  bool wipeable_;

  FRIEND_TEST(NinePatch, StretchRegions);
  FRIEND_TEST(NinePatch, PaddingBox);
  DISALLOW_COPY_AND_ASSIGN(NinePatch);
};

typedef base::ReferentPtr<NinePatch>::Type NinePatchPtr;

}  // namespace image
}  // namespace ion

#endif  // ION_IMAGE_NINEPATCH_H_