Mercurial > hg > svcore
view base/BaseTypes.h @ 1529:c1c45c5146bb zoom
Merge from default branch
author | Chris Cannam |
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date | Tue, 18 Sep 2018 15:06:58 +0100 |
parents | 710e6250a401 a7485c1bdba5 |
children | bf32b26d1dad |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This program 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 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #ifndef SV_BASE_TYPES_H #define SV_BASE_TYPES_H #include <cstdint> #include <complex> #include <vector> #include <bqvec/Allocators.h> /** Frame index, the unit of our time axis. This is signed because the axis conceptually extends below zero: zero represents the start of the main loaded audio model, not the start of time; a windowed transform could legitimately produce results before then. We also use this for frame counts, simply to avoid error-prone arithmetic between signed and unsigned types. */ typedef int64_t sv_frame_t; /** Check whether an integer index is in range for a container, avoiding overflows and signed/unsigned comparison warnings. */ template<typename T, typename C> bool in_range_for(const C &container, T i) { if (i < 0) return false; if (sizeof(T) > sizeof(typename C::size_type)) { return i < static_cast<T>(container.size()); } else { return static_cast<typename C::size_type>(i) < container.size(); } } /** Sample rate. We have to deal with sample rates provided as float or (unsigned) int types, so we might as well have a type that can represent both. Storage size isn't an issue anyway. */ typedef double sv_samplerate_t; typedef std::vector<float, breakfastquay::StlAllocator<float>> floatvec_t; typedef std::vector<std::complex<float>, breakfastquay::StlAllocator<std::complex<float>>> complexvec_t; /** Display zoom level. Can be an integer number of samples per pixel, * or an integer number of pixels per sample. */ struct ZoomLevel { enum Zone { FramesPerPixel, // zoomed out (as in classic SV) PixelsPerFrame // zoomed in beyond 1-1 (interpolating the waveform) }; Zone zone; int level; bool operator<(const ZoomLevel &other) const { if (zone == FramesPerPixel) { if (other.zone == zone) { return level < other.level; } else { return false; } } else { if (other.zone == zone) { return level > other.level; } else { return false; } } } ZoomLevel incremented() const { if (zone == FramesPerPixel) { return { zone, level + 1 }; } else if (level == 1) { return { FramesPerPixel, 2 }; } else if (level == 2) { return { FramesPerPixel, 1 }; } else { return { zone, level - 1 }; } } ZoomLevel decremented() const { if (zone == PixelsPerFrame) { return { zone, level + 1 }; } else if (level == 1) { return { PixelsPerFrame, 2 }; } else { return { zone, level - 1 }; } } }; #endif