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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#ifndef LIB_JXL_DCT_UTIL_H_
#define LIB_JXL_DCT_UTIL_H_
#include <stddef.h>
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/data_parallel.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_ops.h"
namespace jxl {
union ACPtr {
int32_t* ptr32;
int16_t* ptr16;
ACPtr() = default;
explicit ACPtr(int16_t* p) : ptr16(p) {}
explicit ACPtr(int32_t* p) : ptr32(p) {}
};
union ConstACPtr {
const int32_t* ptr32;
const int16_t* ptr16;
ConstACPtr() = default;
explicit ConstACPtr(const int16_t* p) : ptr16(p) {}
explicit ConstACPtr(const int32_t* p) : ptr32(p) {}
};
enum class ACType { k16 = 0, k32 = 1 };
class ACImage {
public:
virtual ~ACImage() = default;
virtual ACType Type() const = 0;
virtual ACPtr PlaneRow(size_t c, size_t y, size_t xbase) = 0;
virtual ConstACPtr PlaneRow(size_t c, size_t y, size_t xbase) const = 0;
virtual size_t PixelsPerRow() const = 0;
virtual void ZeroFill() = 0;
virtual void ZeroFillPlane(size_t c) = 0;
virtual bool IsEmpty() const = 0;
};
template <typename T>
class ACImageT final : public ACImage {
public:
ACImageT() = default;
ACImageT(size_t xsize, size_t ysize) {
static_assert(
std::is_same<T, int16_t>::value || std::is_same<T, int32_t>::value,
"ACImage must be either 32- or 16- bit");
img_ = Image3<T>(xsize, ysize);
}
ACType Type() const override {
return sizeof(T) == 2 ? ACType::k16 : ACType::k32;
}
ACPtr PlaneRow(size_t c, size_t y, size_t xbase) override {
return ACPtr(img_.PlaneRow(c, y) + xbase);
}
ConstACPtr PlaneRow(size_t c, size_t y, size_t xbase) const override {
return ConstACPtr(img_.PlaneRow(c, y) + xbase);
}
size_t PixelsPerRow() const override { return img_.PixelsPerRow(); }
void ZeroFill() override { ZeroFillImage(&img_); }
void ZeroFillPlane(size_t c) override { ZeroFillImage(&img_.Plane(c)); }
bool IsEmpty() const override {
return img_.xsize() == 0 || img_.ysize() == 0;
}
private:
Image3<T> img_;
};
} // namespace jxl
#endif // LIB_JXL_DCT_UTIL_H_
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