waveform_peak_math.h

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/*
 * Copyright © 2026 Synthstrom Audible Limited
 *
 * This file is part of The Synthstrom Audible Deluge Firmware.
 *
 * The Synthstrom Audible Deluge Firmware is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 */

 
#pragma once
 
#include <cstdint>
#include <optional>
 
struct WaveformRenderData;
 
namespace deluge::gui::waveform {

constexpr int32_t kMaxScanSamplesLog2 = 9;

struct Peak {
    int32_t min; 
    int32_t max; 
};

Peak scanPeak(const char* data, int32_t start, int32_t end, int32_t byte_depth, int32_t num_channels);

int8_t coarsePeak(int32_t value);

int32_t lastClusterEnd(uint64_t audio_bytes, uint32_t audio_start, int32_t cluster_size);

int64_t clusterStart(int32_t index, int32_t size_log2);

int32_t firstFrameOffset(int64_t cluster_start, uint32_t audio_start, int32_t frame_size);

std::optional<int32_t> columnShift(int64_t delta, int64_t zoom, int32_t width);

void remapColumns(WaveformRenderData& data, int64_t scroll, int64_t zoom);
 
} // namespace deluge::gui::waveform