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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_COEFF_ORDER_H_
#define LIB_JXL_COEFF_ORDER_H_
#include <stddef.h>
#include <stdint.h>
#include "lib/jxl/ac_strategy.h"
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/coeff_order_fwd.h"
#include "lib/jxl/common.h"
#include "lib/jxl/dct_util.h"
namespace jxl {
class BitReader;
// Those offsets get multiplied by kDCTBlockSize.
static constexpr size_t kCoeffOrderOffset[] = {
0, 1, 2, 3, 4, 5, 6, 10, 14, 18,
34, 50, 66, 68, 70, 72, 76, 80, 84, 92,
100, 108, 172, 236, 300, 332, 364, 396, 652, 908,
1164, 1292, 1420, 1548, 2572, 3596, 4620, 5132, 5644, 6156,
};
static_assert(3 * kNumOrders + 1 ==
sizeof(kCoeffOrderOffset) / sizeof(*kCoeffOrderOffset),
"Update this array when adding or removing order types.");
static constexpr size_t CoeffOrderOffset(size_t order, size_t c) {
return kCoeffOrderOffset[3 * order + c] * kDCTBlockSize;
}
static constexpr size_t kCoeffOrderMaxSize =
kCoeffOrderOffset[3 * kNumOrders] * kDCTBlockSize;
// Mapping from AC strategy to order bucket. Strategies with different natural
// orders must have different buckets.
constexpr uint8_t kStrategyOrder[] = {
0, 1, 1, 1, 2, 3, 4, 4, 5, 5, 6, 6, 1, 1,
1, 1, 1, 1, 7, 8, 8, 9, 10, 10, 11, 12, 12,
};
static_assert(AcStrategy::kNumValidStrategies ==
sizeof(kStrategyOrder) / sizeof(*kStrategyOrder),
"Update this array when adding or removing AC strategies.");
constexpr uint32_t kPermutationContexts = 8;
uint32_t CoeffOrderContext(uint32_t val);
Status DecodeCoeffOrders(uint16_t used_orders, uint32_t used_acs,
coeff_order_t* order, BitReader* br);
Status DecodePermutation(size_t skip, size_t size, coeff_order_t* order,
BitReader* br);
} // namespace jxl
#endif // LIB_JXL_COEFF_ORDER_H_
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