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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.
#include "lib/jxl/enc_cache.h"
#include <stddef.h>
#include <stdint.h>
#include <type_traits>
#include "lib/jxl/ac_strategy.h"
#include "lib/jxl/base/common.h"
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/base/span.h"
#include "lib/jxl/color_encoding_internal.h"
#include "lib/jxl/compressed_dc.h"
#include "lib/jxl/dct_scales.h"
#include "lib/jxl/dct_util.h"
#include "lib/jxl/dec_frame.h"
#include "lib/jxl/enc_aux_out.h"
#include "lib/jxl/enc_frame.h"
#include "lib/jxl/enc_group.h"
#include "lib/jxl/enc_modular.h"
#include "lib/jxl/enc_quant_weights.h"
#include "lib/jxl/frame_dimensions.h"
#include "lib/jxl/frame_header.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_bundle.h"
#include "lib/jxl/image_ops.h"
#include "lib/jxl/passes_state.h"
#include "lib/jxl/quantizer.h"
namespace jxl {
Status InitializePassesEncoder(const FrameHeader& frame_header,
const Image3F& opsin, const Rect& rect,
const JxlCmsInterface& cms, ThreadPool* pool,
PassesEncoderState* enc_state,
ModularFrameEncoder* modular_frame_encoder,
AuxOut* aux_out) {
PassesSharedState& JXL_RESTRICT shared = enc_state->shared;
enc_state->x_qm_multiplier = std::pow(1.25f, frame_header.x_qm_scale - 2.0f);
enc_state->b_qm_multiplier = std::pow(1.25f, frame_header.b_qm_scale - 2.0f);
if (enc_state->coeffs.size() < frame_header.passes.num_passes) {
enc_state->coeffs.reserve(frame_header.passes.num_passes);
for (size_t i = enc_state->coeffs.size();
i < frame_header.passes.num_passes; i++) {
// Allocate enough coefficients for each group on every row.
enc_state->coeffs.emplace_back(make_unique<ACImageT<int32_t>>(
kGroupDim * kGroupDim, shared.frame_dim.num_groups));
}
}
while (enc_state->coeffs.size() > frame_header.passes.num_passes) {
enc_state->coeffs.pop_back();
}
if (enc_state->initialize_global_state) {
float scale =
shared.quantizer.ScaleGlobalScale(enc_state->cparams.quant_ac_rescale);
DequantMatricesScaleDC(&shared.matrices, scale);
shared.quantizer.RecomputeFromGlobalScale();
}
Image3F dc(shared.frame_dim.xsize_blocks, shared.frame_dim.ysize_blocks);
JXL_RETURN_IF_ERROR(RunOnPool(
pool, 0, shared.frame_dim.num_groups, ThreadPool::NoInit,
[&](size_t group_idx, size_t _) {
ComputeCoefficients(group_idx, enc_state, opsin, rect, &dc);
},
"Compute coeffs"));
if (frame_header.flags & FrameHeader::kUseDcFrame) {
CompressParams cparams = enc_state->cparams;
cparams.dots = Override::kOff;
cparams.noise = Override::kOff;
cparams.patches = Override::kOff;
cparams.gaborish = Override::kOff;
cparams.epf = 0;
cparams.resampling = 1;
cparams.ec_resampling = 1;
// The DC frame will have alpha=0. Don't erase its contents.
cparams.keep_invisible = Override::kOn;
JXL_ASSERT(cparams.progressive_dc > 0);
cparams.progressive_dc--;
// Use kVarDCT in max_error_mode for intermediate progressive DC,
// and kModular for the smallest DC (first in the bitstream)
if (cparams.progressive_dc == 0) {
cparams.modular_mode = true;
cparams.speed_tier =
SpeedTier(std::max(static_cast<int>(SpeedTier::kTortoise),
static_cast<int>(cparams.speed_tier) - 1));
cparams.butteraugli_distance =
std::max(kMinButteraugliDistance,
enc_state->cparams.butteraugli_distance * 0.02f);
} else {
cparams.max_error_mode = true;
for (size_t c = 0; c < 3; c++) {
cparams.max_error[c] = shared.quantizer.MulDC()[c];
}
// Guess a distance that produces good initial results.
cparams.butteraugli_distance =
std::max(kMinButteraugliDistance,
enc_state->cparams.butteraugli_distance * 0.1f);
}
ImageBundle ib(&shared.metadata->m);
// This is a lie - dc is in XYB
// (but EncodeFrame will skip RGB->XYB conversion anyway)
ib.SetFromImage(
std::move(dc),
ColorEncoding::LinearSRGB(shared.metadata->m.color_encoding.IsGray()));
if (!ib.metadata()->extra_channel_info.empty()) {
// Add placeholder extra channels to the patch image: dc_level frames do
// not yet support extra channels, but the codec expects that the amount
// of extra channels in frames matches that in the metadata of the
// codestream.
std::vector<ImageF> extra_channels;
extra_channels.reserve(ib.metadata()->extra_channel_info.size());
for (size_t i = 0; i < ib.metadata()->extra_channel_info.size(); i++) {
extra_channels.emplace_back(ib.xsize(), ib.ysize());
// Must initialize the image with data to not affect blending with
// uninitialized memory.
// TODO(lode): dc_level must copy and use the real extra channels
// instead.
ZeroFillImage(&extra_channels.back());
}
ib.SetExtraChannels(std::move(extra_channels));
}
auto special_frame = std::unique_ptr<BitWriter>(new BitWriter());
FrameInfo dc_frame_info;
dc_frame_info.frame_type = FrameType::kDCFrame;
dc_frame_info.dc_level = frame_header.dc_level + 1;
dc_frame_info.ib_needs_color_transform = false;
dc_frame_info.save_before_color_transform = true; // Implicitly true
AuxOut dc_aux_out;
JXL_CHECK(EncodeFrame(cparams, dc_frame_info, shared.metadata, ib, cms,
pool, special_frame.get(),
aux_out ? &dc_aux_out : nullptr));
if (aux_out) {
for (const auto& l : dc_aux_out.layers) {
aux_out->layers[kLayerDC].Assimilate(l);
}
}
const Span<const uint8_t> encoded = special_frame->GetSpan();
enc_state->special_frames.emplace_back(std::move(special_frame));
ImageBundle decoded(&shared.metadata->m);
std::unique_ptr<PassesDecoderState> dec_state =
jxl::make_unique<PassesDecoderState>();
JXL_CHECK(
dec_state->output_encoding_info.SetFromMetadata(*shared.metadata));
const uint8_t* frame_start = encoded.data();
size_t encoded_size = encoded.size();
for (int i = 0; i <= cparams.progressive_dc; ++i) {
JXL_CHECK(DecodeFrame(dec_state.get(), pool, frame_start, encoded_size,
/*frame_header=*/nullptr, &decoded,
*shared.metadata));
frame_start += decoded.decoded_bytes();
encoded_size -= decoded.decoded_bytes();
}
// TODO(lode): frame_header.dc_level should be equal to
// dec_state.frame_header.dc_level - 1 here, since above we set
// dc_frame_info.dc_level = frame_header.dc_level + 1, and
// dc_frame_info.dc_level is used by EncodeFrame. However, if EncodeFrame
// outputs multiple frames, this assumption could be wrong.
const Image3F& dc_frame =
dec_state->shared->dc_frames[frame_header.dc_level];
shared.dc_storage = Image3F(dc_frame.xsize(), dc_frame.ysize());
CopyImageTo(dc_frame, &shared.dc_storage);
ZeroFillImage(&shared.quant_dc);
shared.dc = &shared.dc_storage;
JXL_CHECK(encoded_size == 0);
} else {
auto compute_dc_coeffs = [&](int group_index, int /* thread */) {
const Rect r = enc_state->shared.frame_dim.DCGroupRect(group_index);
int modular_group_index = group_index;
if (enc_state->streaming_mode) {
JXL_ASSERT(group_index == 0);
modular_group_index = enc_state->dc_group_index;
}
modular_frame_encoder->AddVarDCTDC(
frame_header, dc, r, modular_group_index,
enc_state->cparams.speed_tier < SpeedTier::kFalcon, enc_state,
/*jpeg_transcode=*/false);
};
JXL_RETURN_IF_ERROR(RunOnPool(pool, 0, shared.frame_dim.num_dc_groups,
ThreadPool::NoInit, compute_dc_coeffs,
"Compute DC coeffs"));
// TODO(veluca): this is only useful in tests and if inspection is enabled.
if (!(frame_header.flags & FrameHeader::kSkipAdaptiveDCSmoothing)) {
AdaptiveDCSmoothing(shared.quantizer.MulDC(), &shared.dc_storage, pool);
}
}
auto compute_ac_meta = [&](int group_index, int /* thread */) {
const Rect r = enc_state->shared.frame_dim.DCGroupRect(group_index);
int modular_group_index = group_index;
if (enc_state->streaming_mode) {
JXL_ASSERT(group_index == 0);
modular_group_index = enc_state->dc_group_index;
}
modular_frame_encoder->AddACMetadata(r, modular_group_index,
/*jpeg_transcode=*/false, enc_state);
};
JXL_RETURN_IF_ERROR(RunOnPool(pool, 0, shared.frame_dim.num_dc_groups,
ThreadPool::NoInit, compute_ac_meta,
"Compute AC Metadata"));
return true;
}
} // namespace jxl
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