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+// basisu_enc.h
+// Copyright (C) 2019 Binomial LLC. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+#include "transcoder/basisu.h"
+#include "transcoder/basisu_transcoder_internal.h"
+
+#include <mutex>
+#include <atomic>
+#include <condition_variable>
+#include <functional>
+#include <thread>
+#include <unordered_map>
+
+#ifndef _WIN32
+#include <libgen.h>
+#endif
+
+namespace basisu
+{
+ extern uint8_t g_hamming_dist[256];
+
+ // Encoder library initialization
+ void basisu_encoder_init();
+
+ void error_printf(const char *pFmt, ...);
+
+ // Helpers
+
+ inline uint8_t clamp255(int32_t i)
+ {
+ return (uint8_t)((i & 0xFFFFFF00U) ? (~(i >> 31)) : i);
+ }
+
+ // Hashing
+
+ inline uint32_t bitmix32c(uint32_t v)
+ {
+ v = (v + 0x7ed55d16) + (v << 12);
+ v = (v ^ 0xc761c23c) ^ (v >> 19);
+ v = (v + 0x165667b1) + (v << 5);
+ v = (v + 0xd3a2646c) ^ (v << 9);
+ v = (v + 0xfd7046c5) + (v << 3);
+ v = (v ^ 0xb55a4f09) ^ (v >> 16);
+ return v;
+ }
+
+ inline uint32_t bitmix32(uint32_t v)
+ {
+ v -= (v << 6);
+ v ^= (v >> 17);
+ v -= (v << 9);
+ v ^= (v << 4);
+ v -= (v << 3);
+ v ^= (v << 10);
+ v ^= (v >> 15);
+ return v;
+ }
+
+ uint32_t hash_hsieh(const uint8_t* pBuf, size_t len);
+
+ template <typename Key>
+ struct bit_hasher
+ {
+ std::size_t operator()(const Key& k) const
+ {
+ return hash_hsieh(reinterpret_cast<const uint8_t *>(&k), sizeof(k));
+ }
+ };
+
+ // Linear algebra
+
+ template <uint32_t N, typename T>
+ class vec
+ {
+ protected:
+ T m_v[N];
+
+ public:
+ enum { num_elements = N };
+
+ inline vec() { }
+ inline vec(eZero) { set_zero(); }
+
+ explicit inline vec(T val) { set(val); }
+ inline vec(T v0, T v1) { set(v0, v1); }
+ inline vec(T v0, T v1, T v2) { set(v0, v1, v2); }
+ inline vec(T v0, T v1, T v2, T v3) { set(v0, v1, v2, v3); }
+ inline vec(const vec &other) { for (uint32_t i = 0; i < N; i++) m_v[i] = other.m_v[i]; }
+ template <uint32_t OtherN, typename OtherT> inline vec(const vec<OtherN, OtherT> &other) { set(other); }
+
+ inline T operator[](uint32_t i) const { assert(i < N); return m_v[i]; }
+ inline T &operator[](uint32_t i) { assert(i < N); return m_v[i]; }
+
+ inline T getX() const { return m_v[0]; }
+ inline T getY() const { static_assert(N >= 2, "N too small"); return m_v[1]; }
+ inline T getZ() const { static_assert(N >= 3, "N too small"); return m_v[2]; }
+ inline T getW() const { static_assert(N >= 4, "N too small"); return m_v[3]; }
+
+ inline bool operator==(const vec &rhs) const { for (uint32_t i = 0; i < N; i++) if (m_v[i] != rhs.m_v[i]) return false; return true; }
+ inline bool operator<(const vec &rhs) const { for (uint32_t i = 0; i < N; i++) { if (m_v[i] < rhs.m_v[i]) return true; else if (m_v[i] != rhs.m_v[i]) return false; } return false; }
+
+ inline void set_zero() { for (uint32_t i = 0; i < N; i++) m_v[i] = 0; }
+
+ template <uint32_t OtherN, typename OtherT>
+ inline vec &set(const vec<OtherN, OtherT> &other)
+ {
+ uint32_t i;
+ if (static_cast<void *>(&other) == static_cast<void *>(this))
+ return *this;
+ const uint32_t m = minimum(OtherN, N);
+ for (i = 0; i < m; i++)
+ m_v[i] = static_cast<T>(other[i]);
+ for (; i < N; i++)
+ m_v[i] = 0;
+ return *this;
+ }
+
+ inline vec &set_component(uint32_t index, T val) { assert(index < N); m_v[index] = val; return *this; }
+ inline vec &set(T val) { for (uint32_t i = 0; i < N; i++) m_v[i] = val; return *this; }
+ inline void clear_elements(uint32_t s, uint32_t e) { assert(e <= N); for (uint32_t i = s; i < e; i++) m_v[i] = 0; }
+
+ inline vec &set(T v0, T v1)
+ {
+ m_v[0] = v0;
+ if (N >= 2)
+ {
+ m_v[1] = v1;
+ clear_elements(2, N);
+ }
+ return *this;
+ }
+
+ inline vec &set(T v0, T v1, T v2)
+ {
+ m_v[0] = v0;
+ if (N >= 2)
+ {
+ m_v[1] = v1;
+ if (N >= 3)
+ {
+ m_v[2] = v2;
+ clear_elements(3, N);
+ }
+ }
+ return *this;
+ }
+
+ inline vec &set(T v0, T v1, T v2, T v3)
+ {
+ m_v[0] = v0;
+ if (N >= 2)
+ {
+ m_v[1] = v1;
+ if (N >= 3)
+ {
+ m_v[2] = v2;
+
+ if (N >= 4)
+ {
+ m_v[3] = v3;
+ clear_elements(5, N);
+ }
+ }
+ }
+ return *this;
+ }
+
+ inline vec &operator=(const vec &rhs) { if (this != &rhs) for (uint32_t i = 0; i < N; i++) m_v[i] = rhs.m_v[i]; return *this; }
+ template <uint32_t OtherN, typename OtherT> inline vec &operator=(const vec<OtherN, OtherT> &rhs) { set(rhs); return *this; }
+
+ inline const T *get_ptr() const { return reinterpret_cast<const T *>(&m_v[0]); }
+ inline T *get_ptr() { return reinterpret_cast<T *>(&m_v[0]); }
+
+ inline vec operator- () const { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = -m_v[i]; return res; }
+ inline vec operator+ () const { return *this; }
+ inline vec &operator+= (const vec &other) { for (uint32_t i = 0; i < N; i++) m_v[i] += other.m_v[i]; return *this; }
+ inline vec &operator-= (const vec &other) { for (uint32_t i = 0; i < N; i++) m_v[i] -= other.m_v[i]; return *this; }
+ inline vec &operator/= (const vec &other) { for (uint32_t i = 0; i < N; i++) m_v[i] /= other.m_v[i]; return *this; }
+ inline vec &operator*=(const vec &other) { for (uint32_t i = 0; i < N; i++) m_v[i] *= other.m_v[i]; return *this; }
+ inline vec &operator/= (T s) { for (uint32_t i = 0; i < N; i++) m_v[i] /= s; return *this; }
+ inline vec &operator*= (T s) { for (uint32_t i = 0; i < N; i++) m_v[i] *= s; return *this; }
+
+ friend inline vec operator+(const vec &lhs, const vec &rhs) { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = lhs.m_v[i] + rhs.m_v[i]; return res; }
+ friend inline vec operator-(const vec &lhs, const vec &rhs) { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = lhs.m_v[i] - rhs.m_v[i]; return res; }
+ friend inline vec operator*(const vec &lhs, T val) { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = lhs.m_v[i] * val; return res; }
+ friend inline vec operator*(T val, const vec &rhs) { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = val * rhs.m_v[i]; return res; }
+ friend inline vec operator/(const vec &lhs, T val) { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = lhs.m_v[i] / val; return res; }
+ friend inline vec operator/(const vec &lhs, const vec &rhs) { vec res; for (uint32_t i = 0; i < N; i++) res.m_v[i] = lhs.m_v[i] / rhs.m_v[i]; return res; }
+
+ static inline T dot_product(const vec &lhs, const vec &rhs) { T res = lhs.m_v[0] * rhs.m_v[0]; for (uint32_t i = 1; i < N; i++) res += lhs.m_v[i] * rhs.m_v[i]; return res; }
+
+ inline T dot(const vec &rhs) const { return dot_product(*this, rhs); }
+
+ inline T norm() const { return dot_product(*this, *this); }
+ inline T length() const { return sqrt(norm()); }
+
+ inline T squared_distance(const vec &other) const { T d2 = 0; for (uint32_t i = 0; i < N; i++) { T d = m_v[i] - other.m_v[i]; d2 += d * d; } return d2; }
+ inline double squared_distance_d(const vec& other) const { double d2 = 0; for (uint32_t i = 0; i < N; i++) { double d = (double)m_v[i] - (double)other.m_v[i]; d2 += d * d; } return d2; }
+
+ inline T distance(const vec &other) const { return static_cast<T>(sqrt(squared_distance(other))); }
+ inline double distance_d(const vec& other) const { return sqrt(squared_distance_d(other)); }
+
+ inline vec &normalize_in_place() { T len = length(); if (len != 0.0f) *this *= (1.0f / len); return *this; }
+
+ inline vec &clamp(T l, T h)
+ {
+ for (uint32_t i = 0; i < N; i++)
+ m_v[i] = basisu::clamp(m_v[i], l, h);
+ return *this;
+ }
+
+ static vec component_min(const vec& a, const vec& b)
+ {
+ vec res;
+ for (uint32_t i = 0; i < N; i++)
+ res[i] = minimum(a[i], b[i]);
+ return res;
+ }
+
+ static vec component_max(const vec& a, const vec& b)
+ {
+ vec res;
+ for (uint32_t i = 0; i < N; i++)
+ res[i] = maximum(a[i], b[i]);
+ return res;
+ }
+ };
+
+ typedef vec<4, double> vec4D;
+ typedef vec<3, double> vec3D;
+ typedef vec<2, double> vec2D;
+ typedef vec<1, double> vec1D;
+
+ typedef vec<4, float> vec4F;
+ typedef vec<3, float> vec3F;
+ typedef vec<2, float> vec2F;
+ typedef vec<1, float> vec1F;
+
+ template <uint32_t Rows, uint32_t Cols, typename T>
+ class matrix
+ {
+ public:
+ typedef vec<Rows, T> col_vec;
+ typedef vec<Cols, T> row_vec;
+
+ typedef T scalar_type;
+
+ enum { rows = Rows, cols = Cols };
+
+ protected:
+ row_vec m_r[Rows];
+
+ public:
+ inline matrix() {}
+ inline matrix(eZero) { set_zero(); }
+ inline matrix(const matrix &other) { for (uint32_t i = 0; i < Rows; i++) m_r[i] = other.m_r[i]; }
+ inline matrix &operator=(const matrix &rhs) { if (this != &rhs) for (uint32_t i = 0; i < Rows; i++) m_r[i] = rhs.m_r[i]; return *this; }
+
+ inline T operator()(uint32_t r, uint32_t c) const { assert((r < Rows) && (c < Cols)); return m_r[r][c]; }
+ inline T &operator()(uint32_t r, uint32_t c) { assert((r < Rows) && (c < Cols)); return m_r[r][c]; }
+
+ inline const row_vec &operator[](uint32_t r) const { assert(r < Rows); return m_r[r]; }
+ inline row_vec &operator[](uint32_t r) { assert(r < Rows); return m_r[r]; }
+
+ inline matrix &set_zero()
+ {
+ for (uint32_t i = 0; i < Rows; i++)
+ m_r[i].set_zero();
+ return *this;
+ }
+
+ inline matrix &set_identity()
+ {
+ for (uint32_t i = 0; i < Rows; i++)
+ {
+ m_r[i].set_zero();
+ if (i < Cols)
+ m_r[i][i] = 1.0f;
+ }
+ return *this;
+ }
+ };
+
+ template<uint32_t N, typename VectorType>
+ inline VectorType compute_pca_from_covar(matrix<N, N, float> &cmatrix)
+ {
+ VectorType axis;
+ if (N == 1)
+ axis.set(1.0f);
+ else
+ {
+ for (uint32_t i = 0; i < N; i++)
+ axis[i] = lerp(.75f, 1.25f, i * (1.0f / maximum<int>(N - 1, 1)));
+ }
+
+ VectorType prev_axis(axis);
+
+ // Power iterations
+ for (uint32_t power_iter = 0; power_iter < 8; power_iter++)
+ {
+ VectorType trial_axis;
+ double max_sum = 0;
+
+ for (uint32_t i = 0; i < N; i++)
+ {
+ double sum = 0;
+ for (uint32_t j = 0; j < N; j++)
+ sum += cmatrix[i][j] * axis[j];
+
+ trial_axis[i] = static_cast<float>(sum);
+
+ max_sum = maximum(fabs(sum), max_sum);
+ }
+
+ if (max_sum != 0.0f)
+ trial_axis *= static_cast<float>(1.0f / max_sum);
+
+ VectorType delta_axis(prev_axis - trial_axis);
+
+ prev_axis = axis;
+ axis = trial_axis;
+
+ if (delta_axis.norm() < .0024f)
+ break;
+ }
+
+ return axis.normalize_in_place();
+ }
+
+ template<typename T> inline void indirect_sort(uint32_t num_indices, uint32_t* pIndices, const T* pKeys)
+ {
+ for (uint32_t i = 0; i < num_indices; i++)
+ pIndices[i] = i;
+
+ std::sort(
+ pIndices,
+ pIndices + num_indices,
+ [pKeys](uint32_t a, uint32_t b) { return pKeys[a] < pKeys[b]; }
+ );
+ }
+
+ // Very simple job pool with no dependencies.
+ class job_pool
+ {
+ BASISU_NO_EQUALS_OR_COPY_CONSTRUCT(job_pool);
+
+ public:
+ job_pool(uint32_t num_threads);
+ ~job_pool();
+
+ void add_job(const std::function<void()>& job);
+ void add_job(std::function<void()>&& job);
+
+ void wait_for_all();
+
+ size_t get_total_threads() const { return 1 + m_threads.size(); }
+
+ private:
+ std::vector<std::thread> m_threads;
+ std::vector<std::function<void()> > m_queue;
+
+ std::mutex m_mutex;
+ std::condition_variable m_has_work;
+ std::condition_variable m_no_more_jobs;
+
+ uint32_t m_num_active_jobs;
+
+ std::atomic<bool> m_kill_flag;
+
+ void job_thread(uint32_t index);
+ };
+
+ // Simple 32-bit color class
+
+ class color_rgba_i16
+ {
+ public:
+ union
+ {
+ int16_t m_comps[4];
+
+ struct
+ {
+ int16_t r;
+ int16_t g;
+ int16_t b;
+ int16_t a;
+ };
+ };
+
+ inline color_rgba_i16()
+ {
+ static_assert(sizeof(*this) == sizeof(int16_t)*4, "sizeof(*this) == sizeof(int16_t)*4");
+ }
+
+ inline color_rgba_i16(int sr, int sg, int sb, int sa)
+ {
+ set(sr, sg, sb, sa);
+ }
+
+ inline color_rgba_i16 &set(int sr, int sg, int sb, int sa)
+ {
+ m_comps[0] = (int16_t)clamp<int>(sr, INT16_MIN, INT16_MAX);
+ m_comps[1] = (int16_t)clamp<int>(sg, INT16_MIN, INT16_MAX);
+ m_comps[2] = (int16_t)clamp<int>(sb, INT16_MIN, INT16_MAX);
+ m_comps[3] = (int16_t)clamp<int>(sa, INT16_MIN, INT16_MAX);
+ return *this;
+ }
+ };
+
+ class color_rgba
+ {
+ public:
+ union
+ {
+ uint8_t m_comps[4];
+
+ struct
+ {
+ uint8_t r;
+ uint8_t g;
+ uint8_t b;
+ uint8_t a;
+ };
+ };
+
+ inline color_rgba()
+ {
+ static_assert(sizeof(*this) == 4, "sizeof(*this) != 4");
+ }
+
+ inline color_rgba(int y)
+ {
+ set(y);
+ }
+
+ inline color_rgba(int y, int na)
+ {
+ set(y, na);
+ }
+
+ inline color_rgba(int sr, int sg, int sb, int sa)
+ {
+ set(sr, sg, sb, sa);
+ }
+
+ inline color_rgba(eNoClamp, int sr, int sg, int sb, int sa)
+ {
+ set_noclamp_rgba((uint8_t)sr, (uint8_t)sg, (uint8_t)sb, (uint8_t)sa);
+ }
+
+ inline color_rgba& set_noclamp_y(int y)
+ {
+ m_comps[0] = (uint8_t)y;
+ m_comps[1] = (uint8_t)y;
+ m_comps[2] = (uint8_t)y;
+ m_comps[3] = (uint8_t)255;
+ return *this;
+ }
+
+ inline color_rgba &set_noclamp_rgba(int sr, int sg, int sb, int sa)
+ {
+ m_comps[0] = (uint8_t)sr;
+ m_comps[1] = (uint8_t)sg;
+ m_comps[2] = (uint8_t)sb;
+ m_comps[3] = (uint8_t)sa;
+ return *this;
+ }
+
+ inline color_rgba &set(int y)
+ {
+ m_comps[0] = static_cast<uint8_t>(clamp<int>(y, 0, 255));
+ m_comps[1] = m_comps[0];
+ m_comps[2] = m_comps[0];
+ m_comps[3] = 255;
+ return *this;
+ }
+
+ inline color_rgba &set(int y, int na)
+ {
+ m_comps[0] = static_cast<uint8_t>(clamp<int>(y, 0, 255));
+ m_comps[1] = m_comps[0];
+ m_comps[2] = m_comps[0];
+ m_comps[3] = static_cast<uint8_t>(clamp<int>(na, 0, 255));
+ return *this;
+ }
+
+ inline color_rgba &set(int sr, int sg, int sb, int sa)
+ {
+ m_comps[0] = static_cast<uint8_t>(clamp<int>(sr, 0, 255));
+ m_comps[1] = static_cast<uint8_t>(clamp<int>(sg, 0, 255));
+ m_comps[2] = static_cast<uint8_t>(clamp<int>(sb, 0, 255));
+ m_comps[3] = static_cast<uint8_t>(clamp<int>(sa, 0, 255));
+ return *this;
+ }
+
+ inline color_rgba &set_rgb(int sr, int sg, int sb)
+ {
+ m_comps[0] = static_cast<uint8_t>(clamp<int>(sr, 0, 255));
+ m_comps[1] = static_cast<uint8_t>(clamp<int>(sg, 0, 255));
+ m_comps[2] = static_cast<uint8_t>(clamp<int>(sb, 0, 255));
+ return *this;
+ }
+
+ inline color_rgba &set_rgb(const color_rgba &other)
+ {
+ r = other.r;
+ g = other.g;
+ b = other.b;
+ return *this;
+ }
+
+ inline const uint8_t &operator[] (uint32_t index) const { assert(index < 4); return m_comps[index]; }
+ inline uint8_t &operator[] (uint32_t index) { assert(index < 4); return m_comps[index]; }
+
+ inline void clear()
+ {
+ m_comps[0] = 0;
+ m_comps[1] = 0;
+ m_comps[2] = 0;
+ m_comps[3] = 0;
+ }
+
+ inline bool operator== (const color_rgba &rhs) const
+ {
+ if (m_comps[0] != rhs.m_comps[0]) return false;
+ if (m_comps[1] != rhs.m_comps[1]) return false;
+ if (m_comps[2] != rhs.m_comps[2]) return false;
+ if (m_comps[3] != rhs.m_comps[3]) return false;
+ return true;
+ }
+
+ inline bool operator!= (const color_rgba &rhs) const
+ {
+ return !(*this == rhs);
+ }
+
+ inline bool operator<(const color_rgba &rhs) const
+ {
+ for (int i = 0; i < 4; i++)
+ {
+ if (m_comps[i] < rhs.m_comps[i])
+ return true;
+ else if (m_comps[i] != rhs.m_comps[i])
+ return false;
+ }
+ return false;
+ }
+
+ inline int get_601_luma() const { return (19595U * m_comps[0] + 38470U * m_comps[1] + 7471U * m_comps[2] + 32768U) >> 16U; }
+ inline int get_709_luma() const { return (13938U * m_comps[0] + 46869U * m_comps[1] + 4729U * m_comps[2] + 32768U) >> 16U; }
+ inline int get_luma(bool luma_601) const { return luma_601 ? get_601_luma() : get_709_luma(); }
+ };
+
+ typedef std::vector<color_rgba> color_rgba_vec;
+
+ const color_rgba g_black_color(0, 0, 0, 255);
+ const color_rgba g_white_color(255, 255, 255, 255);
+
+ inline int color_distance(int r0, int g0, int b0, int r1, int g1, int b1)
+ {
+ int dr = r0 - r1, dg = g0 - g1, db = b0 - b1;
+ return dr * dr + dg * dg + db * db;
+ }
+
+ inline int color_distance(int r0, int g0, int b0, int a0, int r1, int g1, int b1, int a1)
+ {
+ int dr = r0 - r1, dg = g0 - g1, db = b0 - b1, da = a0 - a1;
+ return dr * dr + dg * dg + db * db + da * da;
+ }
+
+ inline int color_distance(const color_rgba &c0, const color_rgba &c1, bool alpha)
+ {
+ if (alpha)
+ return color_distance(c0.r, c0.g, c0.b, c0.a, c1.r, c1.g, c1.b, c1.a);
+ else
+ return color_distance(c0.r, c0.g, c0.b, c1.r, c1.g, c1.b);
+ }
+
+ // TODO: Allow user to control channel weightings.
+ inline uint32_t color_distance(bool perceptual, const color_rgba &e1, const color_rgba &e2, bool alpha)
+ {
+ if (perceptual)
+ {
+ const float l1 = e1.r * .2126f + e1.g * .715f + e1.b * .0722f;
+ const float l2 = e2.r * .2126f + e2.g * .715f + e2.b * .0722f;
+
+ const float cr1 = e1.r - l1;
+ const float cr2 = e2.r - l2;
+
+ const float cb1 = e1.b - l1;
+ const float cb2 = e2.b - l2;
+
+ const float dl = l1 - l2;
+ const float dcr = cr1 - cr2;
+ const float dcb = cb1 - cb2;
+
+ uint32_t d = static_cast<uint32_t>(32.0f*4.0f*dl*dl + 32.0f*2.0f*(.5f / (1.0f - .2126f))*(.5f / (1.0f - .2126f))*dcr*dcr + 32.0f*.25f*(.5f / (1.0f - .0722f))*(.5f / (1.0f - .0722f))*dcb*dcb);
+
+ if (alpha)
+ {
+ int da = static_cast<int>(e1.a) - static_cast<int>(e2.a);
+ d += static_cast<uint32_t>(128.0f*da*da);
+ }
+
+ return d;
+ }
+ else
+ return color_distance(e1, e2, alpha);
+ }
+
+ // String helpers
+
+ inline int string_find_right(const std::string& filename, char c)
+ {
+ size_t result = filename.find_last_of(c);
+ return (result == std::string::npos) ? -1 : (int)result;
+ }
+
+ inline std::string string_get_extension(const std::string &filename)
+ {
+ int sep = -1;
+#ifdef _WIN32
+ sep = string_find_right(filename, '\\');
+#endif
+ if (sep < 0)
+ sep = string_find_right(filename, '/');
+
+ int dot = string_find_right(filename, '.');
+ if (dot <= sep)
+ return "";
+
+ std::string result(filename);
+ result.erase(0, dot + 1);
+
+ return result;
+ }
+
+ inline bool string_remove_extension(std::string &filename)
+ {
+ int sep = -1;
+#ifdef _WIN32
+ sep = string_find_right(filename, '\\');
+#endif
+ if (sep < 0)
+ sep = string_find_right(filename, '/');
+
+ int dot = string_find_right(filename, '.');
+ if ((dot < sep) || (dot < 0))
+ return false;
+
+ filename.resize(dot);
+
+ return true;
+ }
+
+ inline std::string string_format(const char* pFmt, ...)
+ {
+ char buf[2048];
+
+ va_list args;
+ va_start(args, pFmt);
+#ifdef _WIN32
+ vsprintf_s(buf, sizeof(buf), pFmt, args);
+#else
+ vsnprintf(buf, sizeof(buf), pFmt, args);
+#endif
+ va_end(args);
+
+ return std::string(buf);
+ }
+
+ inline std::string string_tolower(const std::string& s)
+ {
+ std::string result(s);
+ for (size_t i = 0; i < result.size(); i++)
+ result[i] = (char)tolower((int)result[i]);
+ return result;
+ }
+
+ inline char *strcpy_safe(char *pDst, size_t dst_len, const char *pSrc)
+ {
+ assert(pDst && pSrc && dst_len);
+ if (!dst_len)
+ return pDst;
+
+ const size_t src_len = strlen(pSrc);
+ const size_t src_len_plus_terminator = src_len + 1;
+
+ if (src_len_plus_terminator <= dst_len)
+ memcpy(pDst, pSrc, src_len_plus_terminator);
+ else
+ {
+ if (dst_len > 1)
+ memcpy(pDst, pSrc, dst_len - 1);
+ pDst[dst_len - 1] = '\0';
+ }
+
+ return pDst;
+ }
+
+ inline bool string_ends_with(const std::string& s, char c)
+ {
+ return (s.size() != 0) && (s.back() == c);
+ }
+
+ inline bool string_split_path(const char *p, std::string *pDrive, std::string *pDir, std::string *pFilename, std::string *pExt)
+ {
+#ifdef _MSC_VER
+ char drive_buf[_MAX_DRIVE] = { 0 };
+ char dir_buf[_MAX_DIR] = { 0 };
+ char fname_buf[_MAX_FNAME] = { 0 };
+ char ext_buf[_MAX_EXT] = { 0 };
+
+ errno_t error = _splitpath_s(p,
+ pDrive ? drive_buf : NULL, pDrive ? _MAX_DRIVE : 0,
+ pDir ? dir_buf : NULL, pDir ? _MAX_DIR : 0,
+ pFilename ? fname_buf : NULL, pFilename ? _MAX_FNAME : 0,
+ pExt ? ext_buf : NULL, pExt ? _MAX_EXT : 0);
+ if (error != 0)
+ return false;
+
+ if (pDrive) *pDrive = drive_buf;
+ if (pDir) *pDir = dir_buf;
+ if (pFilename) *pFilename = fname_buf;
+ if (pExt) *pExt = ext_buf;
+ return true;
+#else
+ char dirtmp[1024], nametmp[1024];
+ strcpy_safe(dirtmp, sizeof(dirtmp), p);
+ strcpy_safe(nametmp, sizeof(nametmp), p);
+
+ if (pDrive)
+ pDrive->resize(0);
+
+ const char *pDirName = dirname(dirtmp);
+ const char* pBaseName = basename(nametmp);
+ if ((!pDirName) || (!pBaseName))
+ return false;
+
+ if (pDir)
+ {
+ *pDir = pDirName;
+ if ((pDir->size()) && (pDir->back() != '/'))
+ *pDir += "/";
+ }
+
+ if (pFilename)
+ {
+ *pFilename = pBaseName;
+ string_remove_extension(*pFilename);
+ }
+
+ if (pExt)
+ {
+ *pExt = pBaseName;
+ *pExt = string_get_extension(*pExt);
+ if (pExt->size())
+ *pExt = "." + *pExt;
+ }
+
+ return true;
+#endif
+ }
+
+ inline bool is_path_separator(char c)
+ {
+#ifdef _WIN32
+ return (c == '/') || (c == '\\');
+#else
+ return (c == '/');
+#endif
+ }
+
+ inline bool is_drive_separator(char c)
+ {
+#ifdef _WIN32
+ return (c == ':');
+#else
+ (void)c;
+ return false;
+#endif
+ }
+
+ inline void string_combine_path(std::string &dst, const char *p, const char *q)
+ {
+ std::string temp(p);
+ if (temp.size() && !is_path_separator(q[0]))
+ {
+ if (!is_path_separator(temp.back()))
+ temp.append(1, BASISU_PATH_SEPERATOR_CHAR);
+ }
+ temp += q;
+ dst.swap(temp);
+ }
+
+ inline void string_combine_path(std::string &dst, const char *p, const char *q, const char *r)
+ {
+ string_combine_path(dst, p, q);
+ string_combine_path(dst, dst.c_str(), r);
+ }
+
+ inline void string_combine_path_and_extension(std::string &dst, const char *p, const char *q, const char *r, const char *pExt)
+ {
+ string_combine_path(dst, p, q, r);
+ if ((!string_ends_with(dst, '.')) && (pExt[0]) && (pExt[0] != '.'))
+ dst.append(1, '.');
+ dst.append(pExt);
+ }
+
+ inline bool string_get_pathname(const char *p, std::string &path)
+ {
+ std::string temp_drive, temp_path;
+ if (!string_split_path(p, &temp_drive, &temp_path, NULL, NULL))
+ return false;
+ string_combine_path(path, temp_drive.c_str(), temp_path.c_str());
+ return true;
+ }
+
+ inline bool string_get_filename(const char *p, std::string &filename)
+ {
+ std::string temp_ext;
+ if (!string_split_path(p, nullptr, nullptr, &filename, &temp_ext))
+ return false;
+ filename += temp_ext;
+ return true;
+ }
+
+ class rand
+ {
+ std::mt19937 m_mt;
+
+ public:
+ rand() { }
+
+ rand(uint32_t s) { seed(s); }
+ void seed(uint32_t s) { m_mt.seed(s); }
+
+ // between [l,h]
+ int irand(int l, int h) { std::uniform_int_distribution<int> d(l, h); return d(m_mt); }
+
+ uint32_t urand32() { return static_cast<uint32_t>(irand(INT32_MIN, INT32_MAX)); }
+
+ bool bit() { return irand(0, 1) == 1; }
+
+ uint8_t byte() { return static_cast<uint8_t>(urand32()); }
+
+ // between [l,h)
+ float frand(float l, float h) { std::uniform_real_distribution<float> d(l, h); return d(m_mt); }
+
+ float gaussian(float mean, float stddev) { std::normal_distribution<float> d(mean, stddev); return d(m_mt); }
+ };
+
+ class priority_queue
+ {
+ public:
+ priority_queue() :
+ m_size(0)
+ {
+ }
+
+ void clear()
+ {
+ m_heap.clear();
+ m_size = 0;
+ }
+
+ void init(uint32_t max_entries, uint32_t first_index, float first_priority)
+ {
+ m_heap.resize(max_entries + 1);
+ m_heap[1].m_index = first_index;
+ m_heap[1].m_priority = first_priority;
+ m_size = 1;
+ }
+
+ inline uint32_t size() const { return m_size; }
+
+ inline uint32_t get_top_index() const { return m_heap[1].m_index; }
+ inline float get_top_priority() const { return m_heap[1].m_priority; }
+
+ inline void delete_top()
+ {
+ assert(m_size > 0);
+ m_heap[1] = m_heap[m_size];
+ m_size--;
+ if (m_size)
+ down_heap(1);
+ }
+
+ inline void add_heap(uint32_t index, float priority)
+ {
+ m_size++;
+
+ uint32_t k = m_size;
+
+ if (m_size >= m_heap.size())
+ m_heap.resize(m_size + 1);
+
+ for (;;)
+ {
+ uint32_t parent_index = k >> 1;
+ if ((!parent_index) || (m_heap[parent_index].m_priority > priority))
+ break;
+ m_heap[k] = m_heap[parent_index];
+ k = parent_index;
+ }
+
+ m_heap[k].m_index = index;
+ m_heap[k].m_priority = priority;
+ }
+
+ private:
+ struct entry
+ {
+ uint32_t m_index;
+ float m_priority;
+ };
+
+ std::vector<entry> m_heap;
+ uint32_t m_size;
+
+ // Push down entry at index
+ inline void down_heap(uint32_t heap_index)
+ {
+ uint32_t orig_index = m_heap[heap_index].m_index;
+ const float orig_priority = m_heap[heap_index].m_priority;
+
+ uint32_t child_index;
+ while ((child_index = (heap_index << 1)) <= m_size)
+ {
+ if ((child_index < m_size) && (m_heap[child_index].m_priority < m_heap[child_index + 1].m_priority)) ++child_index;
+ if (orig_priority > m_heap[child_index].m_priority)
+ break;
+ m_heap[heap_index] = m_heap[child_index];
+ heap_index = child_index;
+ }
+
+ m_heap[heap_index].m_index = orig_index;
+ m_heap[heap_index].m_priority = orig_priority;
+ }
+ };
+
+ // Tree structured vector quantization (TSVQ)
+
+ template <typename TrainingVectorType>
+ class tree_vector_quant
+ {
+ public:
+ typedef TrainingVectorType training_vec_type;
+ typedef std::pair<TrainingVectorType, uint64_t> training_vec_with_weight;
+ typedef std::vector< training_vec_with_weight > array_of_weighted_training_vecs;
+
+ tree_vector_quant() :
+ m_next_codebook_index(0)
+ {
+ }
+
+ void clear()
+ {
+ clear_vector(m_training_vecs);
+ clear_vector(m_nodes);
+ m_next_codebook_index = 0;
+ }
+
+ void add_training_vec(const TrainingVectorType &v, uint64_t weight) { m_training_vecs.push_back(std::make_pair(v, weight)); }
+
+ size_t get_total_training_vecs() const { return m_training_vecs.size(); }
+ const array_of_weighted_training_vecs &get_training_vecs() const { return m_training_vecs; }
+ array_of_weighted_training_vecs &get_training_vecs() { return m_training_vecs; }
+
+ void retrieve(std::vector< std::vector<uint32_t> > &codebook) const
+ {
+ for (uint32_t i = 0; i < m_nodes.size(); i++)
+ {
+ const tsvq_node &n = m_nodes[i];
+ if (!n.is_leaf())
+ continue;
+
+ codebook.resize(codebook.size() + 1);
+ codebook.back() = n.m_training_vecs;
+ }
+ }
+
+ void retrieve(std::vector<TrainingVectorType> &codebook) const
+ {
+ for (uint32_t i = 0; i < m_nodes.size(); i++)
+ {
+ const tsvq_node &n = m_nodes[i];
+ if (!n.is_leaf())
+ continue;
+
+ codebook.resize(codebook.size() + 1);
+ codebook.back() = n.m_origin;
+ }
+ }
+
+ void retrieve(uint32_t max_clusters, std::vector<uint_vec> &codebook) const
+ {
+ uint_vec node_stack;
+ node_stack.reserve(512);
+
+ codebook.resize(0);
+ codebook.reserve(max_clusters);
+
+ uint32_t node_index = 0;
+
+ while (true)
+ {
+ const tsvq_node& cur = m_nodes[node_index];
+
+ if (cur.is_leaf() || ((2 + cur.m_codebook_index) > (int)max_clusters))
+ {
+ codebook.resize(codebook.size() + 1);
+ codebook.back() = cur.m_training_vecs;
+
+ if (node_stack.empty())
+ break;
+
+ node_index = node_stack.back();
+ node_stack.pop_back();
+ continue;
+ }
+
+ node_stack.push_back(cur.m_right_index);
+ node_index = cur.m_left_index;
+ }
+ }
+
+ bool generate(uint32_t max_size)
+ {
+ if (!m_training_vecs.size())
+ return false;
+
+ m_next_codebook_index = 0;
+
+ clear_vector(m_nodes);
+ m_nodes.reserve(max_size * 2 + 1);
+
+ m_nodes.push_back(prepare_root());
+
+ priority_queue var_heap;
+ var_heap.init(max_size, 0, m_nodes[0].m_var);
+
+ std::vector<uint32_t> l_children, r_children;
+
+ // Now split the worst nodes
+ l_children.reserve(m_training_vecs.size() + 1);
+ r_children.reserve(m_training_vecs.size() + 1);
+
+ uint32_t total_leaf_nodes = 1;
+
+ while ((var_heap.size()) && (total_leaf_nodes < max_size))
+ {
+ const uint32_t node_index = var_heap.get_top_index();
+ const tsvq_node &node = m_nodes[node_index];
+
+ assert(node.m_var == var_heap.get_top_priority());
+ assert(node.is_leaf());
+
+ var_heap.delete_top();
+
+ if (node.m_training_vecs.size() > 1)
+ {
+ if (split_node(node_index, var_heap, l_children, r_children))
+ {
+ // This removes one leaf node (making an internal node) and replaces it with two new leaves, so +1 total.
+ total_leaf_nodes += 1;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ private:
+ class tsvq_node
+ {
+ public:
+ inline tsvq_node() : m_weight(0), m_origin(cZero), m_left_index(-1), m_right_index(-1), m_codebook_index(-1) { }
+
+ // vecs is erased
+ inline void set(const TrainingVectorType &org, uint64_t weight, float var, std::vector<uint32_t> &vecs) { m_origin = org; m_weight = weight; m_var = var; m_training_vecs.swap(vecs); }
+
+ inline bool is_leaf() const { return m_left_index < 0; }
+
+ float m_var;
+ uint64_t m_weight;
+ TrainingVectorType m_origin;
+ int32_t m_left_index, m_right_index;
+ std::vector<uint32_t> m_training_vecs;
+ int m_codebook_index;
+ };
+
+ typedef std::vector<tsvq_node> tsvq_node_vec;
+ tsvq_node_vec m_nodes;
+
+ array_of_weighted_training_vecs m_training_vecs;
+
+ uint32_t m_next_codebook_index;
+
+ tsvq_node prepare_root() const
+ {
+ double ttsum = 0.0f;
+
+ // Prepare root node containing all training vectors
+ tsvq_node root;
+ root.m_training_vecs.reserve(m_training_vecs.size());
+
+ for (uint32_t i = 0; i < m_training_vecs.size(); i++)
+ {
+ const TrainingVectorType &v = m_training_vecs[i].first;
+ const uint64_t weight = m_training_vecs[i].second;
+
+ root.m_training_vecs.push_back(i);
+
+ root.m_origin += (v * static_cast<float>(weight));
+ root.m_weight += weight;
+
+ ttsum += v.dot(v) * weight;
+ }
+
+ root.m_var = static_cast<float>(ttsum - (root.m_origin.dot(root.m_origin) / root.m_weight));
+
+ root.m_origin *= (1.0f / root.m_weight);
+
+ return root;
+ }
+
+ bool split_node(uint32_t node_index, priority_queue &var_heap, std::vector<uint32_t> &l_children, std::vector<uint32_t> &r_children)
+ {
+ TrainingVectorType l_child_org, r_child_org;
+ uint64_t l_weight = 0, r_weight = 0;
+ float l_var = 0.0f, r_var = 0.0f;
+
+ // Compute initial left/right child origins
+ if (!prep_split(m_nodes[node_index], l_child_org, r_child_org))
+ return false;
+
+ // Use k-means iterations to refine these children vectors
+ if (!refine_split(m_nodes[node_index], l_child_org, l_weight, l_var, l_children, r_child_org, r_weight, r_var, r_children))
+ return false;
+
+ // Create children
+ const uint32_t l_child_index = (uint32_t)m_nodes.size(), r_child_index = (uint32_t)m_nodes.size() + 1;
+
+ m_nodes[node_index].m_left_index = l_child_index;
+ m_nodes[node_index].m_right_index = r_child_index;
+
+ m_nodes[node_index].m_codebook_index = m_next_codebook_index;
+ m_next_codebook_index++;
+
+ m_nodes.resize(m_nodes.size() + 2);
+
+ tsvq_node &l_child = m_nodes[l_child_index], &r_child = m_nodes[r_child_index];
+
+ l_child.set(l_child_org, l_weight, l_var, l_children);
+ r_child.set(r_child_org, r_weight, r_var, r_children);
+
+ if ((l_child.m_var <= 0.0f) && (l_child.m_training_vecs.size() > 1))
+ {
+ TrainingVectorType v(m_training_vecs[l_child.m_training_vecs[0]].first);
+
+ for (uint32_t i = 1; i < l_child.m_training_vecs.size(); i++)
+ {
+ if (!(v == m_training_vecs[l_child.m_training_vecs[i]].first))
+ {
+ l_child.m_var = 1e-4f;
+ break;
+ }
+ }
+ }
+
+ if ((r_child.m_var <= 0.0f) && (r_child.m_training_vecs.size() > 1))
+ {
+ TrainingVectorType v(m_training_vecs[r_child.m_training_vecs[0]].first);
+
+ for (uint32_t i = 1; i < r_child.m_training_vecs.size(); i++)
+ {
+ if (!(v == m_training_vecs[r_child.m_training_vecs[i]].first))
+ {
+ r_child.m_var = 1e-4f;
+ break;
+ }
+ }
+ }
+
+ if ((l_child.m_var > 0.0f) && (l_child.m_training_vecs.size() > 1))
+ var_heap.add_heap(l_child_index, l_var);
+
+ if ((r_child.m_var > 0.0f) && (r_child.m_training_vecs.size() > 1))
+ var_heap.add_heap(r_child_index, r_var);
+
+ return true;
+ }
+
+ TrainingVectorType compute_split_axis(const tsvq_node &node) const
+ {
+ const uint32_t N = TrainingVectorType::num_elements;
+
+ matrix<N, N, float> cmatrix(cZero);
+
+ // Compute covariance matrix from weighted input vectors
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ {
+ const TrainingVectorType v(m_training_vecs[node.m_training_vecs[i]].first - node.m_origin);
+ const TrainingVectorType w(static_cast<float>(m_training_vecs[node.m_training_vecs[i]].second) * v);
+
+ for (uint32_t x = 0; x < N; x++)
+ for (uint32_t y = x; y < N; y++)
+ cmatrix[x][y] = cmatrix[x][y] + v[x] * w[y];
+ }
+
+ const float renorm_scale = 1.0f / node.m_weight;
+
+ for (uint32_t x = 0; x < N; x++)
+ for (uint32_t y = x; y < N; y++)
+ cmatrix[x][y] *= renorm_scale;
+
+ // Diagonal flip
+ for (uint32_t x = 0; x < (N - 1); x++)
+ for (uint32_t y = x + 1; y < N; y++)
+ cmatrix[y][x] = cmatrix[x][y];
+
+ return compute_pca_from_covar<N, TrainingVectorType>(cmatrix);
+ }
+
+ bool prep_split(const tsvq_node &node, TrainingVectorType &l_child_result, TrainingVectorType &r_child_result) const
+ {
+ const uint32_t N = TrainingVectorType::num_elements;
+
+ if (2 == node.m_training_vecs.size())
+ {
+ l_child_result = m_training_vecs[node.m_training_vecs[0]].first;
+ r_child_result = m_training_vecs[node.m_training_vecs[1]].first;
+ return true;
+ }
+
+ TrainingVectorType axis(compute_split_axis(node)), l_child(0.0f), r_child(0.0f);
+ double l_weight = 0.0f, r_weight = 0.0f;
+
+ // Compute initial left/right children
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ {
+ const float weight = (float)m_training_vecs[node.m_training_vecs[i]].second;
+
+ const TrainingVectorType &v = m_training_vecs[node.m_training_vecs[i]].first;
+
+ double t = (v - node.m_origin).dot(axis);
+ if (t >= 0.0f)
+ {
+ r_child += v * weight;
+ r_weight += weight;
+ }
+ else
+ {
+ l_child += v * weight;
+ l_weight += weight;
+ }
+ }
+
+ if ((l_weight > 0.0f) && (r_weight > 0.0f))
+ {
+ l_child_result = l_child * static_cast<float>(1.0f / l_weight);
+ r_child_result = r_child * static_cast<float>(1.0f / r_weight);
+ }
+ else
+ {
+ TrainingVectorType l(1e+20f);
+ TrainingVectorType h(-1e+20f);
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ {
+ const TrainingVectorType& v = m_training_vecs[node.m_training_vecs[i]].first;
+
+ l = TrainingVectorType::component_min(l, v);
+ h = TrainingVectorType::component_max(h, v);
+ }
+
+ TrainingVectorType r(h - l);
+
+ float largest_axis_v = 0.0f;
+ int largest_axis_index = -1;
+ for (uint32_t i = 0; i < TrainingVectorType::num_elements; i++)
+ {
+ if (r[i] > largest_axis_v)
+ {
+ largest_axis_v = r[i];
+ largest_axis_index = i;
+ }
+ }
+
+ if (largest_axis_index < 0)
+ return false;
+
+ std::vector<float> keys(node.m_training_vecs.size());
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ keys[i] = m_training_vecs[node.m_training_vecs[i]].first[largest_axis_index];
+
+ uint_vec indices(node.m_training_vecs.size());
+ indirect_sort((uint32_t)node.m_training_vecs.size(), &indices[0], &keys[0]);
+
+ l_child.set_zero();
+ l_weight = 0;
+
+ r_child.set_zero();
+ r_weight = 0;
+
+ const uint32_t half_index = (uint32_t)node.m_training_vecs.size() / 2;
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ {
+ const float weight = (float)m_training_vecs[node.m_training_vecs[i]].second;
+
+ const TrainingVectorType& v = m_training_vecs[node.m_training_vecs[i]].first;
+
+ if (i < half_index)
+ {
+ l_child += v * weight;
+ l_weight += weight;
+ }
+ else
+ {
+ r_child += v * weight;
+ r_weight += weight;
+ }
+ }
+
+ if ((l_weight > 0.0f) && (r_weight > 0.0f))
+ {
+ l_child_result = l_child * static_cast<float>(1.0f / l_weight);
+ r_child_result = r_child * static_cast<float>(1.0f / r_weight);
+ }
+ else
+ {
+ l_child_result = l;
+ r_child_result = h;
+ }
+ }
+
+ return true;
+ }
+
+ bool refine_split(const tsvq_node &node,
+ TrainingVectorType &l_child, uint64_t &l_weight, float &l_var, std::vector<uint32_t> &l_children,
+ TrainingVectorType &r_child, uint64_t &r_weight, float &r_var, std::vector<uint32_t> &r_children) const
+ {
+ l_children.reserve(node.m_training_vecs.size());
+ r_children.reserve(node.m_training_vecs.size());
+
+ float prev_total_variance = 1e+10f;
+
+ // Refine left/right children locations using k-means iterations
+ const uint32_t cMaxIters = 6;
+ for (uint32_t iter = 0; iter < cMaxIters; iter++)
+ {
+ l_children.resize(0);
+ r_children.resize(0);
+
+ TrainingVectorType new_l_child(cZero), new_r_child(cZero);
+
+ double l_ttsum = 0.0f, r_ttsum = 0.0f;
+
+ l_weight = 0;
+ r_weight = 0;
+
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ {
+ const TrainingVectorType &v = m_training_vecs[node.m_training_vecs[i]].first;
+ const uint64_t weight = m_training_vecs[node.m_training_vecs[i]].second;
+
+ double left_dist2 = l_child.squared_distance_d(v), right_dist2 = r_child.squared_distance_d(v);
+
+ if (left_dist2 >= right_dist2)
+ {
+ new_r_child += (v * static_cast<float>(weight));
+ r_weight += weight;
+
+ r_ttsum += weight * v.dot(v);
+ r_children.push_back(node.m_training_vecs[i]);
+ }
+ else
+ {
+ new_l_child += (v * static_cast<float>(weight));
+ l_weight += weight;
+
+ l_ttsum += weight * v.dot(v);
+ l_children.push_back(node.m_training_vecs[i]);
+ }
+ }
+
+ if ((!l_weight) || (!r_weight))
+ {
+ TrainingVectorType firstVec;
+ for (uint32_t i = 0; i < node.m_training_vecs.size(); i++)
+ {
+ const TrainingVectorType& v = m_training_vecs[node.m_training_vecs[i]].first;
+ const uint64_t weight = m_training_vecs[node.m_training_vecs[i]].second;
+
+ if ((!i) || (v == firstVec))
+ {
+ firstVec = v;
+
+ new_r_child += (v * static_cast<float>(weight));
+ r_weight += weight;
+
+ r_ttsum += weight * v.dot(v);
+ r_children.push_back(node.m_training_vecs[i]);
+ }
+ else
+ {
+ new_l_child += (v * static_cast<float>(weight));
+ l_weight += weight;
+
+ l_ttsum += weight * v.dot(v);
+ l_children.push_back(node.m_training_vecs[i]);
+ }
+ }
+
+ if (!l_weight)
+ return false;
+ }
+
+ l_var = static_cast<float>(l_ttsum - (new_l_child.dot(new_l_child) / l_weight));
+ r_var = static_cast<float>(r_ttsum - (new_r_child.dot(new_r_child) / r_weight));
+
+ new_l_child *= (1.0f / l_weight);
+ new_r_child *= (1.0f / r_weight);
+
+ l_child = new_l_child;
+ r_child = new_r_child;
+
+ float total_var = l_var + r_var;
+ const float cGiveupVariance = .00001f;
+ if (total_var < cGiveupVariance)
+ break;
+
+ // Check to see if the variance has settled
+ const float cVarianceDeltaThresh = .00125f;
+ if (((prev_total_variance - total_var) / total_var) < cVarianceDeltaThresh)
+ break;
+
+ prev_total_variance = total_var;
+ }
+
+ return true;
+ }
+ };
+
+ struct weighted_block_group
+ {
+ uint64_t m_total_weight;
+ uint_vec m_indices;
+ };
+
+ template<typename Quantizer>
+ bool generate_hierarchical_codebook_threaded_internal(Quantizer& q,
+ uint32_t max_codebook_size, uint32_t max_parent_codebook_size,
+ std::vector<uint_vec>& codebook,
+ std::vector<uint_vec>& parent_codebook,
+ uint32_t max_threads, bool limit_clusterizers, job_pool *pJob_pool)
+ {
+ codebook.resize(0);
+ parent_codebook.resize(0);
+
+ if ((max_threads <= 1) || (q.get_training_vecs().size() < 256) || (max_codebook_size < max_threads * 16))
+ {
+ if (!q.generate(max_codebook_size))
+ return false;
+
+ q.retrieve(codebook);
+
+ if (max_parent_codebook_size)
+ q.retrieve(max_parent_codebook_size, parent_codebook);
+
+ return true;
+ }
+
+ const uint32_t cMaxThreads = 16;
+ if (max_threads > cMaxThreads)
+ max_threads = cMaxThreads;
+
+ if (!q.generate(max_threads))
+ return false;
+
+ std::vector<uint_vec> initial_codebook;
+
+ q.retrieve(initial_codebook);
+
+ if (initial_codebook.size() < max_threads)
+ {
+ codebook = initial_codebook;
+
+ if (max_parent_codebook_size)
+ q.retrieve(max_parent_codebook_size, parent_codebook);
+
+ return true;
+ }
+
+ Quantizer quantizers[cMaxThreads];
+
+ bool success_flags[cMaxThreads];
+ clear_obj(success_flags);
+
+ std::vector<uint_vec> local_clusters[cMaxThreads];
+ std::vector<uint_vec> local_parent_clusters[cMaxThreads];
+
+ for (uint32_t thread_iter = 0; thread_iter < max_threads; thread_iter++)
+ {
+ pJob_pool->add_job( [thread_iter, &local_clusters, &local_parent_clusters, &success_flags, &quantizers, &initial_codebook, &q, &limit_clusterizers, &max_codebook_size, &max_threads, &max_parent_codebook_size] {
+
+ Quantizer& lq = quantizers[thread_iter];
+ uint_vec& cluster_indices = initial_codebook[thread_iter];
+
+ uint_vec local_to_global(cluster_indices.size());
+
+ for (uint32_t i = 0; i < cluster_indices.size(); i++)
+ {
+ const uint32_t global_training_vec_index = cluster_indices[i];
+ local_to_global[i] = global_training_vec_index;
+
+ lq.add_training_vec(q.get_training_vecs()[global_training_vec_index].first, q.get_training_vecs()[global_training_vec_index].second);
+ }
+
+ const uint32_t max_clusters = limit_clusterizers ? ((max_codebook_size + max_threads - 1) / max_threads) : (uint32_t)lq.get_total_training_vecs();
+
+ success_flags[thread_iter] = lq.generate(max_clusters);
+
+ if (success_flags[thread_iter])
+ {
+ lq.retrieve(local_clusters[thread_iter]);
+
+ for (uint32_t i = 0; i < local_clusters[thread_iter].size(); i++)
+ {
+ for (uint32_t j = 0; j < local_clusters[thread_iter][i].size(); j++)
+ local_clusters[thread_iter][i][j] = local_to_global[local_clusters[thread_iter][i][j]];
+ }
+
+ if (max_parent_codebook_size)
+ {
+ lq.retrieve((max_parent_codebook_size + max_threads - 1) / max_threads, local_parent_clusters[thread_iter]);
+
+ for (uint32_t i = 0; i < local_parent_clusters[thread_iter].size(); i++)
+ {
+ for (uint32_t j = 0; j < local_parent_clusters[thread_iter][i].size(); j++)
+ local_parent_clusters[thread_iter][i][j] = local_to_global[local_parent_clusters[thread_iter][i][j]];
+ }
+ }
+ }
+
+ } );
+
+ } // thread_iter
+
+ pJob_pool->wait_for_all();
+
+ uint32_t total_clusters = 0, total_parent_clusters = 0;
+
+ for (int thread_iter = 0; thread_iter < (int)max_threads; thread_iter++)
+ {
+ if (!success_flags[thread_iter])
+ return false;
+ total_clusters += (uint32_t)local_clusters[thread_iter].size();
+ total_parent_clusters += (uint32_t)local_parent_clusters[thread_iter].size();
+ }
+
+ codebook.reserve(total_clusters);
+ parent_codebook.reserve(total_parent_clusters);
+
+ for (uint32_t thread_iter = 0; thread_iter < max_threads; thread_iter++)
+ {
+ for (uint32_t j = 0; j < local_clusters[thread_iter].size(); j++)
+ {
+ codebook.resize(codebook.size() + 1);
+ codebook.back().swap(local_clusters[thread_iter][j]);
+ }
+
+ for (uint32_t j = 0; j < local_parent_clusters[thread_iter].size(); j++)
+ {
+ parent_codebook.resize(parent_codebook.size() + 1);
+ parent_codebook.back().swap(local_parent_clusters[thread_iter][j]);
+ }
+ }
+
+ return true;
+ }
+
+ template<typename Quantizer>
+ bool generate_hierarchical_codebook_threaded(Quantizer& q,
+ uint32_t max_codebook_size, uint32_t max_parent_codebook_size,
+ std::vector<uint_vec>& codebook,
+ std::vector<uint_vec>& parent_codebook,
+ uint32_t max_threads, job_pool *pJob_pool)
+ {
+ typedef bit_hasher<typename Quantizer::training_vec_type> training_vec_bit_hasher;
+ typedef std::unordered_map < typename Quantizer::training_vec_type, weighted_block_group,
+ training_vec_bit_hasher> group_hash;
+
+ group_hash unique_vecs;
+
+ weighted_block_group g;
+ g.m_indices.resize(1);
+
+ for (uint32_t i = 0; i < q.get_training_vecs().size(); i++)
+ {
+ g.m_total_weight = q.get_training_vecs()[i].second;
+ g.m_indices[0] = i;
+
+ auto ins_res = unique_vecs.insert(std::make_pair(q.get_training_vecs()[i].first, g));
+
+ if (!ins_res.second)
+ {
+ (ins_res.first)->second.m_total_weight += g.m_total_weight;
+ (ins_res.first)->second.m_indices.push_back(i);
+ }
+ }
+
+ debug_printf("generate_hierarchical_codebook_threaded: %u training vectors, %u unique training vectors\n", q.get_total_training_vecs(), (uint32_t)unique_vecs.size());
+
+ Quantizer group_quant;
+ typedef typename group_hash::const_iterator group_hash_const_iter;
+ std::vector<group_hash_const_iter> unique_vec_iters;
+ unique_vec_iters.reserve(unique_vecs.size());
+
+ for (auto iter = unique_vecs.begin(); iter != unique_vecs.end(); ++iter)
+ {
+ group_quant.add_training_vec(iter->first, iter->second.m_total_weight);
+ unique_vec_iters.push_back(iter);
+ }
+
+ bool limit_clusterizers = true;
+ if (unique_vecs.size() <= max_codebook_size)
+ limit_clusterizers = false;
+
+ debug_printf("Limit clusterizers: %u\n", limit_clusterizers);
+
+ std::vector<uint_vec> group_codebook, group_parent_codebook;
+ bool status = generate_hierarchical_codebook_threaded_internal(group_quant,
+ max_codebook_size, max_parent_codebook_size,
+ group_codebook,
+ group_parent_codebook,
+ (unique_vecs.size() < 65536*4) ? 1 : max_threads, limit_clusterizers, pJob_pool);
+
+ if (!status)
+ return false;
+
+ codebook.resize(0);
+ for (uint32_t i = 0; i < group_codebook.size(); i++)
+ {
+ codebook.resize(codebook.size() + 1);
+
+ for (uint32_t j = 0; j < group_codebook[i].size(); j++)
+ {
+ const uint32_t group_index = group_codebook[i][j];
+
+ typename group_hash::const_iterator group_iter = unique_vec_iters[group_index];
+ const uint_vec& training_vec_indices = group_iter->second.m_indices;
+
+ append_vector(codebook.back(), training_vec_indices);
+ }
+ }
+
+ parent_codebook.resize(0);
+ for (uint32_t i = 0; i < group_parent_codebook.size(); i++)
+ {
+ parent_codebook.resize(parent_codebook.size() + 1);
+
+ for (uint32_t j = 0; j < group_parent_codebook[i].size(); j++)
+ {
+ const uint32_t group_index = group_parent_codebook[i][j];
+
+ typename group_hash::const_iterator group_iter = unique_vec_iters[group_index];
+ const uint_vec& training_vec_indices = group_iter->second.m_indices;
+
+ append_vector(parent_codebook.back(), training_vec_indices);
+ }
+ }
+
+ return true;
+ }
+
+ // Canonical Huffman coding
+
+ class histogram
+ {
+ std::vector<uint32_t> m_hist;
+
+ public:
+ histogram(uint32_t size = 0) { init(size); }
+
+ void clear()
+ {
+ clear_vector(m_hist);
+ }
+
+ void init(uint32_t size)
+ {
+ m_hist.resize(0);
+ m_hist.resize(size);
+ }
+
+ inline uint32_t size() const { return static_cast<uint32_t>(m_hist.size()); }
+
+ inline const uint32_t &operator[] (uint32_t index) const
+ {
+ return m_hist[index];
+ }
+
+ inline uint32_t &operator[] (uint32_t index)
+ {
+ return m_hist[index];
+ }
+
+ inline void inc(uint32_t index)
+ {
+ m_hist[index]++;
+ }
+
+ uint64_t get_total() const
+ {
+ uint64_t total = 0;
+ for (uint32_t i = 0; i < m_hist.size(); ++i)
+ total += m_hist[i];
+ return total;
+ }
+
+ double get_entropy() const
+ {
+ double total = static_cast<double>(get_total());
+ if (total == 0.0f)
+ return 0.0f;
+
+ const double inv_total = 1.0f / total;
+ const double neg_inv_log2 = -1.0f / log(2.0f);
+
+ double e = 0.0f;
+ for (uint32_t i = 0; i < m_hist.size(); i++)
+ if (m_hist[i])
+ e += log(m_hist[i] * inv_total) * neg_inv_log2 * static_cast<double>(m_hist[i]);
+
+ return e;
+ }
+ };
+
+ struct sym_freq
+ {
+ uint16_t m_key, m_sym_index;
+ };
+
+ sym_freq *canonical_huffman_radix_sort_syms(uint32_t num_syms, sym_freq *pSyms0, sym_freq *pSyms1);
+ void canonical_huffman_calculate_minimum_redundancy(sym_freq *A, int num_syms);
+ void canonical_huffman_enforce_max_code_size(int *pNum_codes, int code_list_len, int max_code_size);
+
+ class huffman_encoding_table
+ {
+ public:
+ huffman_encoding_table()
+ {
+ }
+
+ void clear()
+ {
+ clear_vector(m_codes);
+ clear_vector(m_code_sizes);
+ }
+
+ bool init(const histogram &h, uint32_t max_code_size = cHuffmanMaxSupportedCodeSize)
+ {
+ return init(h.size(), &h[0], max_code_size);
+ }
+
+ bool init(uint32_t num_syms, const uint16_t *pFreq, uint32_t max_code_size);
+ bool init(uint32_t num_syms, const uint32_t *pSym_freq, uint32_t max_code_size);
+
+ inline const uint16_vec &get_codes() const { return m_codes; }
+ inline const uint8_vec &get_code_sizes() const { return m_code_sizes; }
+
+ uint32_t get_total_used_codes() const
+ {
+ for (int i = static_cast<int>(m_code_sizes.size()) - 1; i >= 0; i--)
+ if (m_code_sizes[i])
+ return i + 1;
+ return 0;
+ }
+
+ private:
+ uint16_vec m_codes;
+ uint8_vec m_code_sizes;
+ };
+
+ class bitwise_coder
+ {
+ public:
+ bitwise_coder() :
+ m_bit_buffer(0),
+ m_bit_buffer_size(0),
+ m_total_bits(0)
+ {
+ }
+
+ inline void clear()
+ {
+ clear_vector(m_bytes);
+ m_bit_buffer = 0;
+ m_bit_buffer_size = 0;
+ m_total_bits = 0;
+ }
+
+ inline const uint8_vec &get_bytes() const { return m_bytes; }
+
+ inline uint64_t get_total_bits() const { return m_total_bits; }
+ inline void clear_total_bits() { m_total_bits = 0; }
+
+ inline void init(uint32_t reserve_size = 1024)
+ {
+ m_bytes.reserve(reserve_size);
+ m_bytes.resize(0);
+
+ m_bit_buffer = 0;
+ m_bit_buffer_size = 0;
+ m_total_bits = 0;
+ }
+
+ inline uint32_t flush()
+ {
+ if (m_bit_buffer_size)
+ {
+ m_total_bits += 8;
+ append_byte(static_cast<uint8_t>(m_bit_buffer));
+
+ m_bit_buffer = 0;
+ m_bit_buffer_size = 0;
+
+ return 8;
+ }
+
+ return 0;
+ }
+
+ inline uint32_t put_bits(uint32_t bits, uint32_t num_bits)
+ {
+ assert(num_bits <= 32);
+ assert(bits < (1ULL << num_bits));
+
+ if (!num_bits)
+ return 0;
+
+ m_total_bits += num_bits;
+
+ uint64_t v = (static_cast<uint64_t>(bits) << m_bit_buffer_size) | m_bit_buffer;
+ m_bit_buffer_size += num_bits;
+
+ while (m_bit_buffer_size >= 8)
+ {
+ append_byte(static_cast<uint8_t>(v));
+ v >>= 8;
+ m_bit_buffer_size -= 8;
+ }
+
+ m_bit_buffer = static_cast<uint8_t>(v);
+ return num_bits;
+ }
+
+ inline uint32_t put_code(uint32_t sym, const huffman_encoding_table &tab)
+ {
+ uint32_t code = tab.get_codes()[sym];
+ uint32_t code_size = tab.get_code_sizes()[sym];
+ assert(code_size >= 1);
+ put_bits(code, code_size);
+ return code_size;
+ }
+
+ inline uint32_t put_truncated_binary(uint32_t v, uint32_t n)
+ {
+ assert((n >= 2) && (v < n));
+
+ uint32_t k = floor_log2i(n);
+ uint32_t u = (1 << (k + 1)) - n;
+
+ if (v < u)
+ return put_bits(v, k);
+
+ uint32_t x = v + u;
+ assert((x >> 1) >= u);
+
+ put_bits(x >> 1, k);
+ put_bits(x & 1, 1);
+ return k + 1;
+ }
+
+ inline uint32_t put_rice(uint32_t v, uint32_t m)
+ {
+ assert(m);
+
+ const uint64_t start_bits = m_total_bits;
+
+ uint32_t q = v >> m, r = v & ((1 << m) - 1);
+
+ // rice coding sanity check
+ assert(q <= 64);
+
+ for (; q > 16; q -= 16)
+ put_bits(0xFFFF, 16);
+
+ put_bits((1 << q) - 1, q);
+ put_bits(r << 1, m + 1);
+
+ return (uint32_t)(m_total_bits - start_bits);
+ }
+
+ inline uint32_t put_vlc(uint32_t v, uint32_t chunk_bits)
+ {
+ assert(chunk_bits);
+
+ const uint32_t chunk_size = 1 << chunk_bits;
+ const uint32_t chunk_mask = chunk_size - 1;
+
+ uint32_t total_bits = 0;
+
+ for ( ; ; )
+ {
+ uint32_t next_v = v >> chunk_bits;
+
+ total_bits += put_bits((v & chunk_mask) | (next_v ? chunk_size : 0), chunk_bits + 1);
+ if (!next_v)
+ break;
+
+ v = next_v;
+ }
+
+ return total_bits;
+ }
+
+ uint32_t emit_huffman_table(const huffman_encoding_table &tab);
+
+ private:
+ uint8_vec m_bytes;
+ uint32_t m_bit_buffer, m_bit_buffer_size;
+ uint64_t m_total_bits;
+
+ void append_byte(uint8_t c)
+ {
+ m_bytes.resize(m_bytes.size() + 1);
+ m_bytes.back() = c;
+ }
+
+ static void end_nonzero_run(uint16_vec &syms, uint32_t &run_size, uint32_t len);
+ static void end_zero_run(uint16_vec &syms, uint32_t &run_size);
+ };
+
+ class huff2D
+ {
+ public:
+ huff2D() { }
+ huff2D(uint32_t bits_per_sym, uint32_t total_syms_per_group) { init(bits_per_sym, total_syms_per_group); }
+
+ inline const histogram &get_histogram() const { return m_histogram; }
+ inline const huffman_encoding_table &get_encoding_table() const { return m_encoding_table; }
+
+ inline void init(uint32_t bits_per_sym, uint32_t total_syms_per_group)
+ {
+ assert((bits_per_sym * total_syms_per_group) <= 16 && total_syms_per_group >= 1 && bits_per_sym >= 1);
+
+ m_bits_per_sym = bits_per_sym;
+ m_total_syms_per_group = total_syms_per_group;
+ m_cur_sym_bits = 0;
+ m_cur_num_syms = 0;
+ m_decode_syms_remaining = 0;
+ m_next_decoder_group_index = 0;
+
+ m_histogram.init(1 << (bits_per_sym * total_syms_per_group));
+ }
+
+ inline void clear()
+ {
+ m_group_bits.clear();
+
+ m_cur_sym_bits = 0;
+ m_cur_num_syms = 0;
+ m_decode_syms_remaining = 0;
+ m_next_decoder_group_index = 0;
+ }
+
+ inline void emit(uint32_t sym)
+ {
+ m_cur_sym_bits |= (sym << (m_cur_num_syms * m_bits_per_sym));
+ m_cur_num_syms++;
+
+ if (m_cur_num_syms == m_total_syms_per_group)
+ flush();
+ }
+
+ inline void flush()
+ {
+ if (m_cur_num_syms)
+ {
+ m_group_bits.push_back(m_cur_sym_bits);
+ m_histogram.inc(m_cur_sym_bits);
+
+ m_cur_sym_bits = 0;
+ m_cur_num_syms = 0;
+ }
+ }
+
+ inline bool start_encoding(uint32_t code_size_limit = 16)
+ {
+ flush();
+
+ if (!m_encoding_table.init(m_histogram, code_size_limit))
+ return false;
+
+ m_decode_syms_remaining = 0;
+ m_next_decoder_group_index = 0;
+
+ return true;
+ }
+
+ inline uint32_t emit_next_sym(bitwise_coder &c)
+ {
+ uint32_t bits = 0;
+
+ if (!m_decode_syms_remaining)
+ {
+ bits = c.put_code(m_group_bits[m_next_decoder_group_index++], m_encoding_table);
+ m_decode_syms_remaining = m_total_syms_per_group;
+ }
+
+ m_decode_syms_remaining--;
+ return bits;
+ }
+
+ inline void emit_flush()
+ {
+ m_decode_syms_remaining = 0;
+ }
+
+ private:
+ uint_vec m_group_bits;
+ huffman_encoding_table m_encoding_table;
+ histogram m_histogram;
+ uint32_t m_bits_per_sym, m_total_syms_per_group, m_cur_sym_bits, m_cur_num_syms, m_next_decoder_group_index, m_decode_syms_remaining;
+ };
+
+ bool huffman_test(int rand_seed);
+
+ // VQ index reordering
+
+ class palette_index_reorderer
+ {
+ public:
+ palette_index_reorderer()
+ {
+ }
+
+ void clear()
+ {
+ clear_vector(m_hist);
+ clear_vector(m_total_count_to_picked);
+ clear_vector(m_entries_picked);
+ clear_vector(m_entries_to_do);
+ clear_vector(m_remap_table);
+ }
+
+ // returns [0,1] distance of entry i to entry j
+ typedef float(*pEntry_dist_func)(uint32_t i, uint32_t j, void *pCtx);
+
+ void init(uint32_t num_indices, const uint32_t *pIndices, uint32_t num_syms, pEntry_dist_func pDist_func, void *pCtx, float dist_func_weight);
+
+ // Table remaps old to new symbol indices
+ inline const uint_vec &get_remap_table() const { return m_remap_table; }
+
+ private:
+ uint_vec m_hist, m_total_count_to_picked, m_entries_picked, m_entries_to_do, m_remap_table;
+
+ inline uint32_t get_hist(int i, int j, int n) const { return (i > j) ? m_hist[j * n + i] : m_hist[i * n + j]; }
+ inline void inc_hist(int i, int j, int n) { if ((i != j) && (i < j) && (i != -1) && (j != -1)) { assert(((uint32_t)i < (uint32_t)n) && ((uint32_t)j < (uint32_t)n)); m_hist[i * n + j]++; } }
+
+ void prepare_hist(uint32_t num_syms, uint32_t num_indices, const uint32_t *pIndices);
+ void find_initial(uint32_t num_syms);
+ void find_next_entry(uint32_t &best_entry, double &best_count, pEntry_dist_func pDist_func, void *pCtx, float dist_func_weight);
+ float pick_side(uint32_t num_syms, uint32_t entry_to_move, pEntry_dist_func pDist_func, void *pCtx, float dist_func_weight);
+ };
+
+ // Simple 32-bit 2D image class
+
+ class image
+ {
+ public:
+ image() :
+ m_width(0), m_height(0), m_pitch(0)
+ {
+ }
+
+ image(uint32_t w, uint32_t h, uint32_t p = UINT32_MAX) :
+ m_width(0), m_height(0), m_pitch(0)
+ {
+ resize(w, h, p);
+ }
+
+ image(const image &other) :
+ m_width(0), m_height(0), m_pitch(0)
+ {
+ *this = other;
+ }
+
+ image &swap(image &other)
+ {
+ std::swap(m_width, other.m_width);
+ std::swap(m_height, other.m_height);
+ std::swap(m_pitch, other.m_pitch);
+ m_pixels.swap(other.m_pixels);
+ return *this;
+ }
+
+ image &operator= (const image &rhs)
+ {
+ if (this != &rhs)
+ {
+ m_width = rhs.m_width;
+ m_height = rhs.m_height;
+ m_pitch = rhs.m_pitch;
+ m_pixels = rhs.m_pixels;
+ }
+ return *this;
+ }
+
+ image &clear()
+ {
+ m_width = 0;
+ m_height = 0;
+ m_pitch = 0;
+ clear_vector(m_pixels);
+ return *this;
+ }
+
+ image &resize(uint32_t w, uint32_t h, uint32_t p = UINT32_MAX, const color_rgba& background = g_black_color)
+ {
+ return crop(w, h, p, background);
+ }
+
+ image &set_all(const color_rgba &c)
+ {
+ for (uint32_t i = 0; i < m_pixels.size(); i++)
+ m_pixels[i] = c;
+ return *this;
+ }
+
+ image &fill_box(uint32_t x, uint32_t y, uint32_t w, uint32_t h, const color_rgba &c)
+ {
+ for (uint32_t iy = 0; iy < h; iy++)
+ for (uint32_t ix = 0; ix < w; ix++)
+ set_clipped(x + ix, y + iy, c);
+ return *this;
+ }
+
+ image &crop_dup_borders(uint32_t w, uint32_t h)
+ {
+ const uint32_t orig_w = m_width, orig_h = m_height;
+
+ crop(w, h);
+
+ if (orig_w && orig_h)
+ {
+ if (m_width > orig_w)
+ {
+ for (uint32_t x = orig_w; x < m_width; x++)
+ for (uint32_t y = 0; y < m_height; y++)
+ set_clipped(x, y, get_clamped(minimum(x, orig_w - 1U), minimum(y, orig_h - 1U)));
+ }
+
+ if (m_height > orig_h)
+ {
+ for (uint32_t y = orig_h; y < m_height; y++)
+ for (uint32_t x = 0; x < m_width; x++)
+ set_clipped(x, y, get_clamped(minimum(x, orig_w - 1U), minimum(y, orig_h - 1U)));
+ }
+ }
+ return *this;
+ }
+
+ image &crop(uint32_t w, uint32_t h, uint32_t p = UINT32_MAX, const color_rgba &background = g_black_color)
+ {
+ if (p == UINT32_MAX)
+ p = w;
+
+ if ((w == m_width) && (m_height == h) && (m_pitch == p))
+ return *this;
+
+ if ((!w) || (!h) || (!p))
+ {
+ clear();
+ return *this;
+ }
+
+ color_rgba_vec cur_state;
+ cur_state.swap(m_pixels);
+
+ m_pixels.resize(p * h);
+
+ for (uint32_t y = 0; y < h; y++)
+ {
+ for (uint32_t x = 0; x < w; x++)
+ {
+ if ((x < m_width) && (y < m_height))
+ m_pixels[x + y * p] = cur_state[x + y * m_pitch];
+ else
+ m_pixels[x + y * p] = background;
+ }
+ }
+
+ m_width = w;
+ m_height = h;
+ m_pitch = p;
+
+ return *this;
+ }
+
+ inline const color_rgba &operator() (uint32_t x, uint32_t y) const { assert(x < m_width && y < m_height); return m_pixels[x + y * m_pitch]; }
+ inline color_rgba &operator() (uint32_t x, uint32_t y) { assert(x < m_width && y < m_height); return m_pixels[x + y * m_pitch]; }
+
+ inline const color_rgba &get_clamped(int x, int y) const { return (*this)(clamp<int>(x, 0, m_width - 1), clamp<int>(y, 0, m_height - 1)); }
+ inline color_rgba &get_clamped(int x, int y) { return (*this)(clamp<int>(x, 0, m_width - 1), clamp<int>(y, 0, m_height - 1)); }
+
+ inline const color_rgba &get_clamped_or_wrapped(int x, int y, bool wrap_u, bool wrap_v) const
+ {
+ x = wrap_u ? posmod(x, m_width) : clamp<int>(x, 0, m_width - 1);
+ y = wrap_v ? posmod(y, m_height) : clamp<int>(y, 0, m_height - 1);
+ return m_pixels[x + y * m_pitch];
+ }
+
+ inline color_rgba &get_clamped_or_wrapped(int x, int y, bool wrap_u, bool wrap_v)
+ {
+ x = wrap_u ? posmod(x, m_width) : clamp<int>(x, 0, m_width - 1);
+ y = wrap_v ? posmod(y, m_height) : clamp<int>(y, 0, m_height - 1);
+ return m_pixels[x + y * m_pitch];
+ }
+
+ inline image &set_clipped(int x, int y, const color_rgba &c)
+ {
+ if ((static_cast<uint32_t>(x) < m_width) && (static_cast<uint32_t>(y) < m_height))
+ (*this)(x, y) = c;
+ return *this;
+ }
+
+ // Very straightforward blit with full clipping. Not fast, but it works.
+ image &blit(const image &src, int src_x, int src_y, int src_w, int src_h, int dst_x, int dst_y)
+ {
+ for (int y = 0; y < src_h; y++)
+ {
+ const int sy = src_y + y;
+ if (sy < 0)
+ continue;
+ else if (sy >= (int)src.get_height())
+ break;
+
+ for (int x = 0; x < src_w; x++)
+ {
+ const int sx = src_x + x;
+ if (sx < 0)
+ continue;
+ else if (sx >= (int)src.get_height())
+ break;
+
+ set_clipped(dst_x + x, dst_y + y, src(sx, sy));
+ }
+ }
+
+ return *this;
+ }
+
+ const image &extract_block_clamped(color_rgba *pDst, uint32_t src_x, uint32_t src_y, uint32_t w, uint32_t h) const
+ {
+ for (uint32_t y = 0; y < h; y++)
+ for (uint32_t x = 0; x < w; x++)
+ *pDst++ = get_clamped(src_x + x, src_y + y);
+ return *this;
+ }
+
+ image &set_block_clipped(const color_rgba *pSrc, uint32_t dst_x, uint32_t dst_y, uint32_t w, uint32_t h)
+ {
+ for (uint32_t y = 0; y < h; y++)
+ for (uint32_t x = 0; x < w; x++)
+ set_clipped(dst_x + x, dst_y + y, *pSrc++);
+ return *this;
+ }
+
+ inline uint32_t get_width() const { return m_width; }
+ inline uint32_t get_height() const { return m_height; }
+ inline uint32_t get_pitch() const { return m_pitch; }
+ inline uint32_t get_total_pixels() const { return m_width * m_height; }
+
+ inline uint32_t get_block_width(uint32_t w) const { return (m_width + (w - 1)) / w; }
+ inline uint32_t get_block_height(uint32_t h) const { return (m_height + (h - 1)) / h; }
+ inline uint32_t get_total_blocks(uint32_t w, uint32_t h) const { return get_block_width(w) * get_block_height(h); }
+
+ inline const color_rgba_vec &get_pixels() const { return m_pixels; }
+ inline color_rgba_vec &get_pixels() { return m_pixels; }
+
+ inline const color_rgba *get_ptr() const { return &m_pixels[0]; }
+ inline color_rgba *get_ptr() { return &m_pixels[0]; }
+
+ bool has_alpha() const
+ {
+ for (uint32_t y = 0; y < m_height; ++y)
+ for (uint32_t x = 0; x < m_width; ++x)
+ if ((*this)(x, y).a < 255)
+ return true;
+
+ return false;
+ }
+
+ image &set_alpha(uint8_t a)
+ {
+ for (uint32_t y = 0; y < m_height; ++y)
+ for (uint32_t x = 0; x < m_width; ++x)
+ (*this)(x, y).a = a;
+ return *this;
+ }
+
+ image &flip_y()
+ {
+ for (uint32_t y = 0; y < m_height / 2; ++y)
+ for (uint32_t x = 0; x < m_width; ++x)
+ std::swap((*this)(x, y), (*this)(x, m_height - 1 - y));
+ return *this;
+ }
+
+ // TODO: There are many ways to do this, not sure this is the best way.
+ image &renormalize_normal_map()
+ {
+ for (uint32_t y = 0; y < m_height; y++)
+ {
+ for (uint32_t x = 0; x < m_width; x++)
+ {
+ color_rgba &c = (*this)(x, y);
+ if ((c.r == 128) && (c.g == 128) && (c.b == 128))
+ continue;
+
+ vec3F v(c.r, c.g, c.b);
+ v = (v * (2.0f / 255.0f)) - vec3F(1.0f);
+ v.clamp(-1.0f, 1.0f);
+
+ float length = v.length();
+ const float cValidThresh = .077f;
+ if (length < cValidThresh)
+ {
+ c.set(128, 128, 128, c.a);
+ }
+ else if (fabs(length - 1.0f) > cValidThresh)
+ {
+ if (length)
+ v /= length;
+
+ for (uint32_t i = 0; i < 3; i++)
+ c[i] = static_cast<uint8_t>(clamp<float>(floor((v[i] + 1.0f) * 255.0f * .5f + .5f), 0.0f, 255.0f));
+
+ if ((c.g == 128) && (c.r == 128))
+ {
+ if (c.b < 128)
+ c.b = 0;
+ else
+ c.b = 255;
+ }
+ }
+ }
+ }
+ return *this;
+ }
+
+ private:
+ uint32_t m_width, m_height, m_pitch; // all in pixels
+ color_rgba_vec m_pixels;
+ };
+
+ // Float images
+
+ typedef std::vector<vec4F> vec4F_vec;
+
+ class imagef
+ {
+ public:
+ imagef() :
+ m_width(0), m_height(0), m_pitch(0)
+ {
+ }
+
+ imagef(uint32_t w, uint32_t h, uint32_t p = UINT32_MAX) :
+ m_width(0), m_height(0), m_pitch(0)
+ {
+ resize(w, h, p);
+ }
+
+ imagef(const imagef &other) :
+ m_width(0), m_height(0), m_pitch(0)
+ {
+ *this = other;
+ }
+
+ imagef &swap(imagef &other)
+ {
+ std::swap(m_width, other.m_width);
+ std::swap(m_height, other.m_height);
+ std::swap(m_pitch, other.m_pitch);
+ m_pixels.swap(other.m_pixels);
+ return *this;
+ }
+
+ imagef &operator= (const imagef &rhs)
+ {
+ if (this != &rhs)
+ {
+ m_width = rhs.m_width;
+ m_height = rhs.m_height;
+ m_pitch = rhs.m_pitch;
+ m_pixels = rhs.m_pixels;
+ }
+ return *this;
+ }
+
+ imagef &clear()
+ {
+ m_width = 0;
+ m_height = 0;
+ m_pitch = 0;
+ clear_vector(m_pixels);
+ return *this;
+ }
+
+ imagef &set(const image &src, const vec4F &scale = vec4F(1), const vec4F &bias = vec4F(0))
+ {
+ const uint32_t width = src.get_width();
+ const uint32_t height = src.get_height();
+
+ resize(width, height);
+
+ for (int y = 0; y < (int)height; y++)
+ {
+ for (uint32_t x = 0; x < width; x++)
+ {
+ const color_rgba &src_pixel = src(x, y);
+ (*this)(x, y).set((float)src_pixel.r * scale[0] + bias[0], (float)src_pixel.g * scale[1] + bias[1], (float)src_pixel.b * scale[2] + bias[2], (float)src_pixel.a * scale[3] + bias[3]);
+ }
+ }
+
+ return *this;
+ }
+
+ imagef &resize(const imagef &other, uint32_t p = UINT32_MAX, const vec4F& background = vec4F(0,0,0,1))
+ {
+ return resize(other.get_width(), other.get_height(), p, background);
+ }
+
+ imagef &resize(uint32_t w, uint32_t h, uint32_t p = UINT32_MAX, const vec4F& background = vec4F(0,0,0,1))
+ {
+ return crop(w, h, p, background);
+ }
+
+ imagef &set_all(const vec4F &c)
+ {
+ for (uint32_t i = 0; i < m_pixels.size(); i++)
+ m_pixels[i] = c;
+ return *this;
+ }
+
+ imagef &fill_box(uint32_t x, uint32_t y, uint32_t w, uint32_t h, const vec4F &c)
+ {
+ for (uint32_t iy = 0; iy < h; iy++)
+ for (uint32_t ix = 0; ix < w; ix++)
+ set_clipped(x + ix, y + iy, c);
+ return *this;
+ }
+
+ imagef &crop(uint32_t w, uint32_t h, uint32_t p = UINT32_MAX, const vec4F &background = vec4F(0,0,0,1))
+ {
+ if (p == UINT32_MAX)
+ p = w;
+
+ if ((w == m_width) && (m_height == h) && (m_pitch == p))
+ return *this;
+
+ if ((!w) || (!h) || (!p))
+ {
+ clear();
+ return *this;
+ }
+
+ vec4F_vec cur_state;
+ cur_state.swap(m_pixels);
+
+ m_pixels.resize(p * h);
+
+ for (uint32_t y = 0; y < h; y++)
+ {
+ for (uint32_t x = 0; x < w; x++)
+ {
+ if ((x < m_width) && (y < m_height))
+ m_pixels[x + y * p] = cur_state[x + y * m_pitch];
+ else
+ m_pixels[x + y * p] = background;
+ }
+ }
+
+ m_width = w;
+ m_height = h;
+ m_pitch = p;
+
+ return *this;
+ }
+
+ inline const vec4F &operator() (uint32_t x, uint32_t y) const { assert(x < m_width && y < m_height); return m_pixels[x + y * m_pitch]; }
+ inline vec4F &operator() (uint32_t x, uint32_t y) { assert(x < m_width && y < m_height); return m_pixels[x + y * m_pitch]; }
+
+ inline const vec4F &get_clamped(int x, int y) const { return (*this)(clamp<int>(x, 0, m_width - 1), clamp<int>(y, 0, m_height - 1)); }
+ inline vec4F &get_clamped(int x, int y) { return (*this)(clamp<int>(x, 0, m_width - 1), clamp<int>(y, 0, m_height - 1)); }
+
+ inline const vec4F &get_clamped_or_wrapped(int x, int y, bool wrap_u, bool wrap_v) const
+ {
+ x = wrap_u ? posmod(x, m_width) : clamp<int>(x, 0, m_width - 1);
+ y = wrap_v ? posmod(y, m_height) : clamp<int>(y, 0, m_height - 1);
+ return m_pixels[x + y * m_pitch];
+ }
+
+ inline vec4F &get_clamped_or_wrapped(int x, int y, bool wrap_u, bool wrap_v)
+ {
+ x = wrap_u ? posmod(x, m_width) : clamp<int>(x, 0, m_width - 1);
+ y = wrap_v ? posmod(y, m_height) : clamp<int>(y, 0, m_height - 1);
+ return m_pixels[x + y * m_pitch];
+ }
+
+ inline imagef &set_clipped(int x, int y, const vec4F &c)
+ {
+ if ((static_cast<uint32_t>(x) < m_width) && (static_cast<uint32_t>(y) < m_height))
+ (*this)(x, y) = c;
+ return *this;
+ }
+
+ // Very straightforward blit with full clipping. Not fast, but it works.
+ imagef &blit(const imagef &src, int src_x, int src_y, int src_w, int src_h, int dst_x, int dst_y)
+ {
+ for (int y = 0; y < src_h; y++)
+ {
+ const int sy = src_y + y;
+ if (sy < 0)
+ continue;
+ else if (sy >= (int)src.get_height())
+ break;
+
+ for (int x = 0; x < src_w; x++)
+ {
+ const int sx = src_x + x;
+ if (sx < 0)
+ continue;
+ else if (sx >= (int)src.get_height())
+ break;
+
+ set_clipped(dst_x + x, dst_y + y, src(sx, sy));
+ }
+ }
+
+ return *this;
+ }
+
+ const imagef &extract_block_clamped(vec4F *pDst, uint32_t src_x, uint32_t src_y, uint32_t w, uint32_t h) const
+ {
+ for (uint32_t y = 0; y < h; y++)
+ for (uint32_t x = 0; x < w; x++)
+ *pDst++ = get_clamped(src_x + x, src_y + y);
+ return *this;
+ }
+
+ imagef &set_block_clipped(const vec4F *pSrc, uint32_t dst_x, uint32_t dst_y, uint32_t w, uint32_t h)
+ {
+ for (uint32_t y = 0; y < h; y++)
+ for (uint32_t x = 0; x < w; x++)
+ set_clipped(dst_x + x, dst_y + y, *pSrc++);
+ return *this;
+ }
+
+ inline uint32_t get_width() const { return m_width; }
+ inline uint32_t get_height() const { return m_height; }
+ inline uint32_t get_pitch() const { return m_pitch; }
+ inline uint32_t get_total_pixels() const { return m_width * m_height; }
+
+ inline uint32_t get_block_width(uint32_t w) const { return (m_width + (w - 1)) / w; }
+ inline uint32_t get_block_height(uint32_t h) const { return (m_height + (h - 1)) / h; }
+ inline uint32_t get_total_blocks(uint32_t w, uint32_t h) const { return get_block_width(w) * get_block_height(h); }
+
+ inline const vec4F_vec &get_pixels() const { return m_pixels; }
+ inline vec4F_vec &get_pixels() { return m_pixels; }
+
+ inline const vec4F *get_ptr() const { return &m_pixels[0]; }
+ inline vec4F *get_ptr() { return &m_pixels[0]; }
+
+ private:
+ uint32_t m_width, m_height, m_pitch; // all in pixels
+ vec4F_vec m_pixels;
+ };
+
+ // Image metrics
+
+ class image_metrics
+ {
+ public:
+ // TODO: Add ssim
+ float m_max, m_mean, m_mean_squared, m_rms, m_psnr, m_ssim;
+
+ image_metrics()
+ {
+ clear();
+ }
+
+ void clear()
+ {
+ m_max = 0;
+ m_mean = 0;
+ m_mean_squared = 0;
+ m_rms = 0;
+ m_psnr = 0;
+ m_ssim = 0;
+ }
+
+ void print(const char *pPrefix = nullptr) { printf("%sMax: %3.0f Mean: %3.3f RMS: %3.3f PSNR: %2.3f dB\n", pPrefix ? pPrefix : "", m_max, m_mean, m_rms, m_psnr); }
+
+ void calc(const image &a, const image &b, uint32_t first_chan = 0, uint32_t total_chans = 0, bool avg_comp_error = true, bool use_601_luma = false);
+ };
+
+ // Image saving/loading/resampling
+
+ bool load_png(const char* pFilename, image& img);
+ inline bool load_png(const std::string &filename, image &img) { return load_png(filename.c_str(), img); }
+
+ enum
+ {
+ cImageSaveGrayscale = 1,
+ cImageSaveIgnoreAlpha = 2
+ };
+
+ bool save_png(const char* pFilename, const image& img, uint32_t image_save_flags = 0, uint32_t grayscale_comp = 0);
+ inline bool save_png(const std::string &filename, const image &img, uint32_t image_save_flags = 0, uint32_t grayscale_comp = 0) { return save_png(filename.c_str(), img, image_save_flags, grayscale_comp); }
+
+ bool read_file_to_vec(const char* pFilename, uint8_vec& data);
+
+ bool write_data_to_file(const char* pFilename, const void* pData, size_t len);
+
+ inline bool write_vec_to_file(const char* pFilename, const uint8_vec& v) { return v.size() ? write_data_to_file(pFilename, &v[0], v.size()) : write_data_to_file(pFilename, "", 0); }
+
+ float linear_to_srgb(float l);
+ float srgb_to_linear(float s);
+
+ bool image_resample(const image &src, image &dst, bool srgb = false,
+ const char *pFilter = "lanczos4", float filter_scale = 1.0f,
+ bool wrapping = false,
+ uint32_t first_comp = 0, uint32_t num_comps = 4);
+
+ // Timing
+
+ typedef uint64_t timer_ticks;
+
+ class interval_timer
+ {
+ public:
+ interval_timer();
+
+ void start();
+ void stop();
+
+ double get_elapsed_secs() const;
+ inline double get_elapsed_ms() const { return 1000.0f* get_elapsed_secs(); }
+
+ static void init();
+ static inline timer_ticks get_ticks_per_sec() { return g_freq; }
+ static timer_ticks get_ticks();
+ static double ticks_to_secs(timer_ticks ticks);
+ static inline double ticks_to_ms(timer_ticks ticks) { return ticks_to_secs(ticks) * 1000.0f; }
+
+ private:
+ static timer_ticks g_init_ticks, g_freq;
+ static double g_timer_freq;
+
+ timer_ticks m_start_time, m_stop_time;
+
+ bool m_started, m_stopped;
+ };
+
+ // 2D array
+
+ template<typename T>
+ class vector2D
+ {
+ typedef std::vector<T> TVec;
+
+ uint32_t m_width, m_height;
+ TVec m_values;
+
+ public:
+ vector2D() :
+ m_width(0),
+ m_height(0)
+ {
+ }
+
+ vector2D(uint32_t w, uint32_t h) :
+ m_width(0),
+ m_height(0)
+ {
+ resize(w, h);
+ }
+
+ vector2D(const vector2D &other)
+ {
+ *this = other;
+ }
+
+ vector2D &operator= (const vector2D &other)
+ {
+ if (this != &other)
+ {
+ m_width = other.m_width;
+ m_height = other.m_height;
+ m_values = other.m_values;
+ }
+ return *this;
+ }
+
+ inline bool operator== (const vector2D &rhs) const
+ {
+ return (m_width == rhs.m_width) && (m_height == rhs.m_height) && (m_values == rhs.m_values);
+ }
+
+ inline uint32_t size_in_bytes() const { return (uint32_t)m_values.size() * sizeof(m_values[0]); }
+
+ inline const T &operator() (uint32_t x, uint32_t y) const { assert(x < m_width && y < m_height); return m_values[x + y * m_width]; }
+ inline T &operator() (uint32_t x, uint32_t y) { assert(x < m_width && y < m_height); return m_values[x + y * m_width]; }
+
+ inline const T &operator[] (uint32_t i) const { return m_values[i]; }
+ inline T &operator[] (uint32_t i) { return m_values[i]; }
+
+ inline const T &at_clamped(int x, int y) const { return (*this)(clamp<int>(x, 0, m_width), clamp<int>(y, 0, m_height)); }
+ inline T &at_clamped(int x, int y) { return (*this)(clamp<int>(x, 0, m_width), clamp<int>(y, 0, m_height)); }
+
+ void clear()
+ {
+ m_width = 0;
+ m_height = 0;
+ m_values.clear();
+ }
+
+ void set_all(const T&val)
+ {
+ vector_set_all(m_values, val);
+ }
+
+ inline const T* get_ptr() const { return &m_values[0]; }
+ inline T* get_ptr() { return &m_values[0]; }
+
+ vector2D &resize(uint32_t new_width, uint32_t new_height)
+ {
+ if ((m_width == new_width) && (m_height == new_height))
+ return *this;
+
+ TVec oldVals(new_width * new_height);
+ oldVals.swap(m_values);
+
+ const uint32_t w = minimum(m_width, new_width);
+ const uint32_t h = minimum(m_height, new_height);
+
+ if ((w) && (h))
+ {
+ for (uint32_t y = 0; y < h; y++)
+ for (uint32_t x = 0; x < w; x++)
+ m_values[x + y * new_width] = oldVals[x + y * m_width];
+ }
+
+ m_width = new_width;
+ m_height = new_height;
+
+ return *this;
+ }
+ };
+
+ inline FILE *fopen_safe(const char *pFilename, const char *pMode)
+ {
+#ifdef _WIN32
+ FILE *pFile = nullptr;
+ fopen_s(&pFile, pFilename, pMode);
+ return pFile;
+#else
+ return fopen(pFilename, pMode);
+#endif
+ }
+
+ void fill_buffer_with_random_bytes(void *pBuf, size_t size, uint32_t seed = 1);
+
+} // namespace basisu
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-06 04:44:00 +0000