// 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.

#include "lib/jxl/passes_state.h"

#include "lib/jxl/base/status.h"
#include "lib/jxl/chroma_from_luma.h"
#include "lib/jxl/coeff_order.h"
#include "lib/jxl/frame_dimensions.h"

namespace jxl {

Status InitializePassesSharedState(const FrameHeader& frame_header,
                                   PassesSharedState* JXL_RESTRICT shared,
                                   bool encoder) {
  JXL_ASSERT(frame_header.nonserialized_metadata != nullptr);
  shared->metadata = frame_header.nonserialized_metadata;
  shared->frame_dim = frame_header.ToFrameDimensions();
  shared->image_features.patches.SetPassesSharedState(shared);

  const FrameDimensions& frame_dim = shared->frame_dim;

  JXL_ASSIGN_OR_RETURN(
      shared->ac_strategy,
      AcStrategyImage::Create(frame_dim.xsize_blocks, frame_dim.ysize_blocks));
  JXL_ASSIGN_OR_RETURN(
      shared->raw_quant_field,
      ImageI::Create(frame_dim.xsize_blocks, frame_dim.ysize_blocks));
  JXL_ASSIGN_OR_RETURN(
      shared->epf_sharpness,
      ImageB::Create(frame_dim.xsize_blocks, frame_dim.ysize_blocks));
  JXL_ASSIGN_OR_RETURN(shared->cmap, ColorCorrelationMap::Create(
                                         frame_dim.xsize, frame_dim.ysize));

  // In the decoder, we allocate coeff orders afterwards, when we know how many
  // we will actually need.
  shared->coeff_order_size = kCoeffOrderMaxSize;
  if (encoder &&
      shared->coeff_orders.size() <
          frame_header.passes.num_passes * kCoeffOrderMaxSize &&
      frame_header.encoding == FrameEncoding::kVarDCT) {
    shared->coeff_orders.resize(frame_header.passes.num_passes *
                                kCoeffOrderMaxSize);
  }

  JXL_ASSIGN_OR_RETURN(
      shared->quant_dc,
      ImageB::Create(frame_dim.xsize_blocks, frame_dim.ysize_blocks));

  bool use_dc_frame = ((frame_header.flags & FrameHeader::kUseDcFrame) != 0u);
  if (!encoder && use_dc_frame) {
    if (frame_header.dc_level == 4) {
      return JXL_FAILURE("Invalid DC level for kUseDcFrame: %u",
                         frame_header.dc_level);
    }
    shared->dc_storage = Image3F();
    shared->dc = &shared->dc_frames[frame_header.dc_level];
    if (shared->dc->xsize() == 0) {
      return JXL_FAILURE(
          "kUseDcFrame specified for dc_level %u, but no frame was decoded "
          "with level %u",
          frame_header.dc_level, frame_header.dc_level + 1);
    }
    ZeroFillImage(&shared->quant_dc);
  } else {
    JXL_ASSIGN_OR_RETURN(
        shared->dc_storage,
        Image3F::Create(frame_dim.xsize_blocks, frame_dim.ysize_blocks));
    shared->dc = &shared->dc_storage;
  }

  return true;
}

}  // namespace jxl