1 // Copyright (c) the JPEG XL Project Authors. All rights reserved. 2 // 3 // Use of this source code is governed by a BSD-style 4 // license that can be found in the LICENSE file. 5 6 #ifndef LIB_JXL_ENC_COEFF_ORDER_H_ 7 #define LIB_JXL_ENC_COEFF_ORDER_H_ 8 9 #include <stddef.h> 10 #include <stdint.h> 11 12 #include "lib/jxl/ac_strategy.h" 13 #include "lib/jxl/aux_out_fwd.h" 14 #include "lib/jxl/base/compiler_specific.h" 15 #include "lib/jxl/base/status.h" 16 #include "lib/jxl/coeff_order.h" 17 #include "lib/jxl/coeff_order_fwd.h" 18 #include "lib/jxl/common.h" 19 #include "lib/jxl/dct_util.h" 20 #include "lib/jxl/dec_bit_reader.h" 21 #include "lib/jxl/enc_bit_writer.h" 22 #include "lib/jxl/enc_params.h" 23 24 namespace jxl { 25 26 // Orders that are actually used in part of image. `rect` is in block units. 27 uint32_t ComputeUsedOrders(SpeedTier speed, const AcStrategyImage& ac_strategy, 28 const Rect& rect); 29 30 // Modify zig-zag order, so that DCT bands with more zeros go later. 31 // Order of DCT bands with same number of zeros is untouched, so 32 // permutation will be cheaper to encode. 33 void ComputeCoeffOrder(SpeedTier speed, const ACImage& acs, 34 const AcStrategyImage& ac_strategy, 35 const FrameDimensions& frame_dim, uint32_t& used_orders, 36 coeff_order_t* JXL_RESTRICT order); 37 38 void EncodeCoeffOrders(uint16_t used_orders, 39 const coeff_order_t* JXL_RESTRICT order, 40 BitWriter* writer, size_t layer, 41 AuxOut* JXL_RESTRICT aux_out); 42 43 // Encoding/decoding of a single permutation. `size`: number of elements in the 44 // permutation. `skip`: number of elements to skip from the *beginning* of the 45 // permutation. 46 void EncodePermutation(const coeff_order_t* JXL_RESTRICT order, size_t skip, 47 size_t size, BitWriter* writer, int layer, 48 AuxOut* aux_out); 49 50 } // namespace jxl 51 52 #endif // LIB_JXL_ENC_COEFF_ORDER_H_ 53