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basisu_enc.cpp
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basisu_enc.cpp
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// basisu_enc.cpp
// Copyright (C) 2017-2019 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.
#include "basisu_enc.h"
#include "lodepng.h"
#include "basisu_resampler.h"
#include "basisu_resampler_filters.h"
#include "basisu_etc.h"
#include "transcoder/basisu_transcoder.h"
#if defined(_WIN32)
// For QueryPerformanceCounter/QueryPerformanceFrequency
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
namespace basisu
{
uint64_t interval_timer::g_init_ticks, interval_timer::g_freq;
double interval_timer::g_timer_freq;
uint8_t g_hamming_dist[256] =
{
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
};
// Encoder library initialization (just call once at startup)
void basisu_encoder_init()
{
pack_etc1_block_init();
basist::basisu_transcoder_init();
}
void error_printf(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);
fprintf(stderr, "ERROR: %s", buf);
}
#if defined(_WIN32)
inline void query_counter(timer_ticks* pTicks)
{
QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(pTicks));
}
inline void query_counter_frequency(timer_ticks* pTicks)
{
QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(pTicks));
}
#elif defined(__APPLE__)
#include <sys/time.h>
inline void query_counter(timer_ticks* pTicks)
{
struct timeval cur_time;
gettimeofday(&cur_time, NULL);
*pTicks = static_cast<unsigned long long>(cur_time.tv_sec) * 1000000ULL + static_cast<unsigned long long>(cur_time.tv_usec);
}
inline void query_counter_frequency(timer_ticks* pTicks)
{
*pTicks = 1000000;
}
#elif defined(__GNUC__)
#include <sys/timex.h>
inline void query_counter(timer_ticks* pTicks)
{
struct timeval cur_time;
gettimeofday(&cur_time, NULL);
*pTicks = static_cast<unsigned long long>(cur_time.tv_sec) * 1000000ULL + static_cast<unsigned long long>(cur_time.tv_usec);
}
inline void query_counter_frequency(timer_ticks* pTicks)
{
*pTicks = 1000000;
}
#else
#error TODO
#endif
interval_timer::interval_timer() : m_start_time(0), m_stop_time(0), m_started(false), m_stopped(false)
{
if (!g_timer_freq)
init();
}
void interval_timer::start()
{
query_counter(&m_start_time);
m_started = true;
m_stopped = false;
}
void interval_timer::stop()
{
assert(m_started);
query_counter(&m_stop_time);
m_stopped = true;
}
double interval_timer::get_elapsed_secs() const
{
assert(m_started);
if (!m_started)
return 0;
timer_ticks stop_time = m_stop_time;
if (!m_stopped)
query_counter(&stop_time);
timer_ticks delta = stop_time - m_start_time;
return delta * g_timer_freq;
}
void interval_timer::init()
{
if (!g_timer_freq)
{
query_counter_frequency(&g_freq);
g_timer_freq = 1.0f / g_freq;
query_counter(&g_init_ticks);
}
}
timer_ticks interval_timer::get_ticks()
{
if (!g_timer_freq)
init();
timer_ticks ticks;
query_counter(&ticks);
return ticks - g_init_ticks;
}
double interval_timer::ticks_to_secs(timer_ticks ticks)
{
if (!g_timer_freq)
init();
return ticks * g_timer_freq;
}
bool load_png(const char* pFilename, image& img)
{
std::vector<uint8_t> buffer;
unsigned err = lodepng::load_file(buffer, std::string(pFilename));
if (err)
return false;
unsigned w = 0, h = 0;
if (sizeof(void *) == sizeof(uint32_t))
{
// Inspect the image first on 32-bit builds, to see if the image would require too much memory.
lodepng::State state;
err = lodepng_inspect(&w, &h, &state, &buffer[0], buffer.size());
if ((err != 0) || (!w) || (!h))
return false;
const uint32_t exepected_alloc_size = w * h * sizeof(uint32_t);
// If the file is too large on 32-bit builds then just bail now, to prevent causing a memory exception.
const uint32_t MAX_ALLOC_SIZE = 250000000;
if (exepected_alloc_size >= MAX_ALLOC_SIZE)
{
error_printf("Image \"%s\" is too large (%ux%u) to process in a 32-bit build!\n", pFilename, w, h);
return false;
}
w = h = 0;
}
std::vector<uint8_t> out;
err = lodepng::decode(out, w, h, &buffer[0], buffer.size());
if ((err != 0) || (!w) || (!h))
return false;
if (out.size() != (w * h * 4))
return false;
img.resize(w, h);
memcpy(img.get_ptr(), &out[0], out.size());
return true;
}
bool save_png(const char* pFilename, const image & img, uint32_t image_save_flags, uint32_t grayscale_comp)
{
if (!img.get_total_pixels())
return false;
std::vector<uint8_t> out;
unsigned err = 0;
if (image_save_flags & cImageSaveGrayscale)
{
uint8_vec g_pixels(img.get_width() * img.get_height());
uint8_t *pDst = &g_pixels[0];
for (uint32_t y = 0; y < img.get_height(); y++)
for (uint32_t x = 0; x < img.get_width(); x++)
*pDst++ = img(x, y)[grayscale_comp];
err = lodepng::encode(out, (const uint8_t*)& g_pixels[0], img.get_width(), img.get_height(), LCT_GREY, 8);
}
else
{
bool has_alpha = img.has_alpha();
if ((!has_alpha) || ((image_save_flags & cImageSaveIgnoreAlpha) != 0))
{
uint8_vec rgb_pixels(img.get_width() * 3 * img.get_height());
uint8_t *pDst = &rgb_pixels[0];
for (uint32_t y = 0; y < img.get_height(); y++)
{
for (uint32_t x = 0; x < img.get_width(); x++)
{
const color_rgba& c = img(x, y);
pDst[0] = c.r;
pDst[1] = c.g;
pDst[2] = c.b;
pDst += 3;
}
}
err = lodepng::encode(out, (const uint8_t*)& rgb_pixels[0], img.get_width(), img.get_height(), LCT_RGB, 8);
}
else
{
err = lodepng::encode(out, (const uint8_t*)img.get_ptr(), img.get_width(), img.get_height(), LCT_RGBA, 8);
}
}
err = lodepng::save_file(out, std::string(pFilename));
if (err)
return false;
return true;
}
bool read_file_to_vec(const char* pFilename, uint8_vec& data)
{
FILE* pFile = nullptr;
#ifdef _WIN32
fopen_s(&pFile, pFilename, "rb");
#else
pFile = fopen(pFilename, "rb");
#endif
if (!pFile)
return false;
fseek(pFile, 0, SEEK_END);
#ifdef _WIN32
int64_t filesize = _ftelli64(pFile);
#else
int64_t filesize = ftello(pFile);
#endif
if (filesize < 0)
{
fclose(pFile);
return false;
}
fseek(pFile, 0, SEEK_SET);
if (sizeof(size_t) == sizeof(uint32_t))
{
if (filesize > 0x70000000)
{
// File might be too big to load safely in one alloc
fclose(pFile);
return false;
}
}
data.resize((size_t)filesize);
if (filesize)
{
if (fread(&data[0], 1, (size_t)filesize, pFile) != (size_t)filesize)
{
fclose(pFile);
return false;
}
}
fclose(pFile);
return true;
}
bool write_data_to_file(const char* pFilename, const void* pData, size_t len)
{
FILE* pFile = nullptr;
#ifdef _WIN32
fopen_s(&pFile, pFilename, "wb");
#else
pFile = fopen(pFilename, "wb");
#endif
if (!pFile)
return false;
if (len)
{
if (fwrite(pData, 1, len, pFile) != len)
{
fclose(pFile);
return false;
}
}
return fclose(pFile) != EOF;
}
float linear_to_srgb(float l)
{
assert(l >= 0.0f && l <= 1.0f);
if (l < .0031308f)
return saturate(l * 12.92f);
else
return saturate(1.055f * powf(l, 1.0f/2.4f) - .055f);
}
float srgb_to_linear(float s)
{
assert(s >= 0.0f && s <= 1.0f);
if (s < .04045f)
return saturate(s * (1.0f/12.92f));
else
return saturate(powf((s + .055f) * (1.0f/1.055f), 2.4f));
}
bool image_resample(const image &src, image &dst, bool srgb,
const char *pFilter, float filter_scale,
bool wrapping,
uint32_t first_comp, uint32_t num_comps)
{
assert((first_comp + num_comps) <= 4);
const int cMaxComps = 4;
const uint32_t src_w = src.get_width(), src_h = src.get_height();
const uint32_t dst_w = dst.get_width(), dst_h = dst.get_height();
if (maximum(src_w, src_h) > BASISU_RESAMPLER_MAX_DIMENSION)
{
printf("Image is too large!\n");
return false;
}
if (!src_w || !src_h || !dst_w || !dst_h)
return false;
if ((num_comps < 1) || (num_comps > cMaxComps))
return false;
if ((minimum(dst_w, dst_h) < 1) || (maximum(dst_w, dst_h) > BASISU_RESAMPLER_MAX_DIMENSION))
{
printf("Image is too large!\n");
return false;
}
if ((src_w == dst_w) && (src_h == dst_h))
{
dst = src;
return true;
}
float srgb_to_linear_table[256];
if (srgb)
{
for (int i = 0; i < 256; ++i)
srgb_to_linear_table[i] = srgb_to_linear((float)i * (1.0f/255.0f));
}
const int LINEAR_TO_SRGB_TABLE_SIZE = 8192;
uint8_t linear_to_srgb_table[LINEAR_TO_SRGB_TABLE_SIZE];
if (srgb)
{
for (int i = 0; i < LINEAR_TO_SRGB_TABLE_SIZE; ++i)
linear_to_srgb_table[i] = (uint8_t)clamp<int>((int)(255.0f * linear_to_srgb((float)i * (1.0f / (LINEAR_TO_SRGB_TABLE_SIZE - 1))) + .5f), 0, 255);
}
std::vector<float> samples[cMaxComps];
Resampler *resamplers[cMaxComps];
resamplers[0] = new Resampler(src_w, src_h, dst_w, dst_h,
wrapping ? Resampler::BOUNDARY_WRAP : Resampler::BOUNDARY_CLAMP, 0.0f, 1.0f,
pFilter, nullptr, nullptr, filter_scale, filter_scale, 0, 0);
samples[0].resize(src_w);
for (uint32_t i = 1; i < num_comps; ++i)
{
resamplers[i] = new Resampler(src_w, src_h, dst_w, dst_h,
wrapping ? Resampler::BOUNDARY_WRAP : Resampler::BOUNDARY_CLAMP, 0.0f, 1.0f,
pFilter, resamplers[0]->get_clist_x(), resamplers[0]->get_clist_y(), filter_scale, filter_scale, 0, 0);
samples[i].resize(src_w);
}
uint32_t dst_y = 0;
for (uint32_t src_y = 0; src_y < src_h; ++src_y)
{
const color_rgba *pSrc = &src(0, src_y);
// Put source lines into resampler(s)
for (uint32_t x = 0; x < src_w; ++x)
{
for (uint32_t c = 0; c < num_comps; ++c)
{
const uint32_t comp_index = first_comp + c;
const uint32_t v = (*pSrc)[comp_index];
if (!srgb || (comp_index == 3))
samples[c][x] = v * (1.0f / 255.0f);
else
samples[c][x] = srgb_to_linear_table[v];
}
pSrc++;
}
for (uint32_t c = 0; c < num_comps; ++c)
{
if (!resamplers[c]->put_line(&samples[c][0]))
{
for (uint32_t i = 0; i < num_comps; i++)
delete resamplers[i];
return false;
}
}
// Now retrieve any output lines
for (;;)
{
uint32_t c;
for (c = 0; c < num_comps; ++c)
{
const uint32_t comp_index = first_comp + c;
const float *pOutput_samples = resamplers[c]->get_line();
if (!pOutput_samples)
break;
const bool linear_flag = !srgb || (comp_index == 3);
color_rgba *pDst = &dst(0, dst_y);
for (uint32_t x = 0; x < dst_w; x++)
{
// TODO: Add dithering
if (linear_flag)
{
int j = (int)(255.0f * pOutput_samples[x] + .5f);
(*pDst)[comp_index] = (uint8_t)clamp<int>(j, 0, 255);
}
else
{
int j = (int)((LINEAR_TO_SRGB_TABLE_SIZE - 1) * pOutput_samples[x] + .5f);
(*pDst)[comp_index] = linear_to_srgb_table[clamp<int>(j, 0, LINEAR_TO_SRGB_TABLE_SIZE - 1)];
}
pDst++;
}
}
if (c < num_comps)
break;
++dst_y;
}
}
for (uint32_t i = 0; i < num_comps; ++i)
delete resamplers[i];
return true;
}
void canonical_huffman_calculate_minimum_redundancy(sym_freq *A, int num_syms)
{
// See the paper "In-Place Calculation of Minimum Redundancy Codes" by Moffat and Katajainen
if (!num_syms)
return;
if (1 == num_syms)
{
A[0].m_key = 1;
return;
}
A[0].m_key += A[1].m_key;
int s = 2, r = 0, next;
for (next = 1; next < (num_syms - 1); ++next)
{
if ((s >= num_syms) || (A[r].m_key < A[s].m_key))
{
A[next].m_key = A[r].m_key;
A[r].m_key = static_cast<uint16_t>(next);
++r;
}
else
{
A[next].m_key = A[s].m_key;
++s;
}
if ((s >= num_syms) || ((r < next) && A[r].m_key < A[s].m_key))
{
A[next].m_key = static_cast<uint16_t>(A[next].m_key + A[r].m_key);
A[r].m_key = static_cast<uint16_t>(next);
++r;
}
else
{
A[next].m_key = static_cast<uint16_t>(A[next].m_key + A[s].m_key);
++s;
}
}
A[num_syms - 2].m_key = 0;
for (next = num_syms - 3; next >= 0; --next)
{
A[next].m_key = 1 + A[A[next].m_key].m_key;
}
int num_avail = 1, num_used = 0, depth = 0;
r = num_syms - 2;
next = num_syms - 1;
while (num_avail > 0)
{
for ( ; (r >= 0) && ((int)A[r].m_key == depth); ++num_used, --r )
;
for ( ; num_avail > num_used; --next, --num_avail)
A[next].m_key = static_cast<uint16_t>(depth);
num_avail = 2 * num_used;
num_used = 0;
++depth;
}
}
void canonical_huffman_enforce_max_code_size(int *pNum_codes, int code_list_len, int max_code_size)
{
int i;
uint32_t total = 0;
if (code_list_len <= 1)
return;
for (i = max_code_size + 1; i <= cHuffmanMaxSupportedInternalCodeSize; i++)
pNum_codes[max_code_size] += pNum_codes[i];
for (i = max_code_size; i > 0; i--)
total += (((uint32_t)pNum_codes[i]) << (max_code_size - i));
while (total != (1UL << max_code_size))
{
pNum_codes[max_code_size]--;
for (i = max_code_size - 1; i > 0; i--)
{
if (pNum_codes[i])
{
pNum_codes[i]--;
pNum_codes[i + 1] += 2;
break;
}
}
total--;
}
}
sym_freq *canonical_huffman_radix_sort_syms(uint32_t num_syms, sym_freq *pSyms0, sym_freq *pSyms1)
{
uint32_t total_passes = 2, pass_shift, pass, i, hist[256 * 2];
sym_freq *pCur_syms = pSyms0, *pNew_syms = pSyms1;
clear_obj(hist);
for (i = 0; i < num_syms; i++)
{
uint32_t freq = pSyms0[i].m_key;
hist[freq & 0xFF]++;
hist[256 + ((freq >> 8) & 0xFF)]++;
}
while ((total_passes > 1) && (num_syms == hist[(total_passes - 1) * 256]))
total_passes--;
for (pass_shift = 0, pass = 0; pass < total_passes; pass++, pass_shift += 8)
{
const uint32_t *pHist = &hist[pass << 8];
uint32_t offsets[256], cur_ofs = 0;
for (i = 0; i < 256; i++)
{
offsets[i] = cur_ofs;
cur_ofs += pHist[i];
}
for (i = 0; i < num_syms; i++)
pNew_syms[offsets[(pCur_syms[i].m_key >> pass_shift) & 0xFF]++] = pCur_syms[i];
sym_freq *t = pCur_syms;
pCur_syms = pNew_syms;
pNew_syms = t;
}
return pCur_syms;
}
bool huffman_encoding_table::init(uint32_t num_syms, const uint16_t *pFreq, uint32_t max_code_size)
{
if (max_code_size > cHuffmanMaxSupportedCodeSize)
return false;
if ((!num_syms) || (num_syms > cHuffmanMaxSyms))
return false;
uint32_t total_used_syms = 0;
for (uint32_t i = 0; i < num_syms; i++)
if (pFreq[i])
total_used_syms++;
if (!total_used_syms)
return false;
std::vector<sym_freq> sym_freq0(total_used_syms), sym_freq1(total_used_syms);
for (uint32_t i = 0, j = 0; i < num_syms; i++)
{
if (pFreq[i])
{
sym_freq0[j].m_key = pFreq[i];
sym_freq0[j++].m_sym_index = static_cast<uint16_t>(i);
}
}
sym_freq *pSym_freq = canonical_huffman_radix_sort_syms(total_used_syms, &sym_freq0[0], &sym_freq1[0]);
canonical_huffman_calculate_minimum_redundancy(pSym_freq, total_used_syms);
int num_codes[cHuffmanMaxSupportedInternalCodeSize + 1];
clear_obj(num_codes);
for (uint32_t i = 0; i < total_used_syms; i++)
{
if (pSym_freq[i].m_key > cHuffmanMaxSupportedInternalCodeSize)
return false;
num_codes[pSym_freq[i].m_key]++;
}
canonical_huffman_enforce_max_code_size(num_codes, total_used_syms, max_code_size);
m_code_sizes.resize(0);
m_code_sizes.resize(num_syms);
m_codes.resize(0);
m_codes.resize(num_syms);
for (uint32_t i = 1, j = total_used_syms; i <= max_code_size; i++)
for (uint32_t l = num_codes[i]; l > 0; l--)
m_code_sizes[pSym_freq[--j].m_sym_index] = static_cast<uint8_t>(i);
uint32_t next_code[cHuffmanMaxSupportedInternalCodeSize + 1];
next_code[1] = 0;
for (uint32_t j = 0, i = 2; i <= max_code_size; i++)
next_code[i] = j = ((j + num_codes[i - 1]) << 1);
for (uint32_t i = 0; i < num_syms; i++)
{
uint32_t rev_code = 0, code, code_size;
if ((code_size = m_code_sizes[i]) == 0)
continue;
if (code_size > cHuffmanMaxSupportedInternalCodeSize)
return false;
code = next_code[code_size]++;
for (uint32_t l = code_size; l > 0; l--, code >>= 1)
rev_code = (rev_code << 1) | (code & 1);
m_codes[i] = static_cast<uint16_t>(rev_code);
}
return true;
}
bool huffman_encoding_table::init(uint32_t num_syms, const uint32_t *pSym_freq, uint32_t max_code_size)
{
if ((!num_syms) || (num_syms > cHuffmanMaxSyms))
return false;
uint16_vec sym_freq(num_syms);
uint32_t max_freq = 0;
for (uint32_t i = 0; i < num_syms; i++)
max_freq = maximum(max_freq, pSym_freq[i]);
if (max_freq < UINT16_MAX)
{
for (uint32_t i = 0; i < num_syms; i++)
sym_freq[i] = static_cast<uint16_t>(pSym_freq[i]);
}
else
{
for (uint32_t i = 0; i < num_syms; i++)
if (pSym_freq[i])
sym_freq[i] = static_cast<uint16_t>(maximum<uint32_t>((pSym_freq[i] * 65534U + (max_freq >> 1)) / max_freq, 1));
}
return init(num_syms, &sym_freq[0], max_code_size);
}
void bitwise_coder::end_nonzero_run(uint16_vec &syms, uint32_t &run_size, uint32_t len)
{
if (run_size)
{
if (run_size < cHuffmanSmallRepeatSizeMin)
{
while (run_size--)
syms.push_back(static_cast<uint16_t>(len));
}
else if (run_size <= cHuffmanSmallRepeatSizeMax)
{
syms.push_back(static_cast<uint16_t>(cHuffmanSmallRepeatCode | ((run_size - cHuffmanSmallRepeatSizeMin) << 6)));
}
else
{
assert((run_size >= cHuffmanBigRepeatSizeMin) && (run_size <= cHuffmanBigRepeatSizeMax));
syms.push_back(static_cast<uint16_t>(cHuffmanBigRepeatCode | ((run_size - cHuffmanBigRepeatSizeMin) << 6)));
}
}
run_size = 0;
}
void bitwise_coder::end_zero_run(uint16_vec &syms, uint32_t &run_size)
{
if (run_size)
{
if (run_size < cHuffmanSmallZeroRunSizeMin)
{
while (run_size--)
syms.push_back(0);
}
else if (run_size <= cHuffmanSmallZeroRunSizeMax)
{
syms.push_back(static_cast<uint16_t>(cHuffmanSmallZeroRunCode | ((run_size - cHuffmanSmallZeroRunSizeMin) << 6)));
}
else
{
assert((run_size >= cHuffmanBigZeroRunSizeMin) && (run_size <= cHuffmanBigZeroRunSizeMax));
syms.push_back(static_cast<uint16_t>(cHuffmanBigZeroRunCode | ((run_size - cHuffmanBigZeroRunSizeMin) << 6)));
}
}
run_size = 0;
}
uint32_t bitwise_coder::emit_huffman_table(const huffman_encoding_table &tab)
{
const uint64_t start_bits = m_total_bits;
const uint8_vec &code_sizes = tab.get_code_sizes();
uint32_t total_used = tab.get_total_used_codes();
put_bits(total_used, cHuffmanMaxSymsLog2);
if (!total_used)
return 0;
uint16_vec syms;
syms.reserve(total_used + 16);
uint32_t prev_code_len = UINT_MAX, zero_run_size = 0, nonzero_run_size = 0;
for (uint32_t i = 0; i <= total_used; ++i)
{
const uint32_t code_len = (i == total_used) ? 0xFF : code_sizes[i];
assert((code_len == 0xFF) || (code_len <= 16));
if (code_len)
{
end_zero_run(syms, zero_run_size);
if (code_len != prev_code_len)
{
end_nonzero_run(syms, nonzero_run_size, prev_code_len);
if (code_len != 0xFF)
syms.push_back(static_cast<uint16_t>(code_len));
}
else if (++nonzero_run_size == cHuffmanBigRepeatSizeMax)
end_nonzero_run(syms, nonzero_run_size, prev_code_len);
}
else
{
end_nonzero_run(syms, nonzero_run_size, prev_code_len);
if (++zero_run_size == cHuffmanBigZeroRunSizeMax)
end_zero_run(syms, zero_run_size);
}
prev_code_len = code_len;
}
histogram h(cHuffmanTotalCodelengthCodes);
for (uint32_t i = 0; i < syms.size(); i++)
h.inc(syms[i] & 63);
huffman_encoding_table ct;
if (!ct.init(h, 7))
return 0;
assert(cHuffmanTotalSortedCodelengthCodes == cHuffmanTotalCodelengthCodes);
uint32_t total_codelength_codes;
for (total_codelength_codes = cHuffmanTotalSortedCodelengthCodes; total_codelength_codes > 0; total_codelength_codes--)
if (ct.get_code_sizes()[g_huffman_sorted_codelength_codes[total_codelength_codes - 1]])
break;
assert(total_codelength_codes);
put_bits(total_codelength_codes, 5);
for (uint32_t i = 0; i < total_codelength_codes; i++)
put_bits(ct.get_code_sizes()[g_huffman_sorted_codelength_codes[i]], 3);
for (uint32_t i = 0; i < syms.size(); ++i)
{
const uint32_t l = syms[i] & 63, e = syms[i] >> 6;
put_code(l, ct);
if (l == cHuffmanSmallZeroRunCode)
put_bits(e, cHuffmanSmallZeroRunExtraBits);
else if (l == cHuffmanBigZeroRunCode)
put_bits(e, cHuffmanBigZeroRunExtraBits);
else if (l == cHuffmanSmallRepeatCode)
put_bits(e, cHuffmanSmallRepeatExtraBits);
else if (l == cHuffmanBigRepeatCode)
put_bits(e, cHuffmanBigRepeatExtraBits);
}
return (uint32_t)(m_total_bits - start_bits);
}
bool huffman_test(int rand_seed)
{
histogram h(19);
// Feed in a fibonacci sequence to force large codesizes
h[0] += 1; h[1] += 1; h[2] += 2; h[3] += 3;
h[4] += 5; h[5] += 8; h[6] += 13; h[7] += 21;
h[8] += 34; h[9] += 55; h[10] += 89; h[11] += 144;
h[12] += 233; h[13] += 377; h[14] += 610; h[15] += 987;
h[16] += 1597; h[17] += 2584; h[18] += 4181;
huffman_encoding_table etab;
etab.init(h, 16);
{
bitwise_coder c;
c.init(1024);
c.emit_huffman_table(etab);
for (int i = 0; i < 19; i++)
c.put_code(i, etab);
c.flush();
basist::bitwise_decoder d;
d.init(&c.get_bytes()[0], static_cast<uint32_t>(c.get_bytes().size()));
basist::huffman_decoding_table dtab;
bool success = d.read_huffman_table(dtab);
if (!success)
{
assert(0);
printf("Failure 5\n");
return false;
}
for (uint32_t i = 0; i < 19; i++)
{
uint32_t s = d.decode_huffman(dtab);
if (s != i)
{
assert(0);
printf("Failure 5\n");
return false;
}
}
}
basisu::rand r;
r.seed(rand_seed);
for (int iter = 0; iter < 500000; iter++)
{
printf("%u\n", iter);
uint32_t max_sym = r.irand(0, 8193);
uint32_t num_codes = r.irand(1, 10000);
uint_vec syms(num_codes);
for (uint32_t i = 0; i < num_codes; i++)
{
if (r.bit())
syms[i] = r.irand(0, max_sym);
else
{
int s = (int)(r.gaussian((float)max_sym / 2, (float)maximum<int>(1, max_sym / 2)) + .5f);
s = basisu::clamp<int>(s, 0, max_sym);
syms[i] = s;
}
}
histogram h1(max_sym + 1);
for (uint32_t i = 0; i < num_codes; i++)
h1[syms[i]]++;
huffman_encoding_table etab2;
if (!etab2.init(h1, 16))
{
assert(0);
printf("Failed 0\n");
return false;
}
bitwise_coder c;
c.init(1024);
c.emit_huffman_table(etab2);
for (uint32_t i = 0; i < num_codes; i++)
c.put_code(syms[i], etab2);
c.flush();
basist::bitwise_decoder d;
d.init(&c.get_bytes()[0], (uint32_t)c.get_bytes().size());
basist::huffman_decoding_table dtab;
bool success = d.read_huffman_table(dtab);
if (!success)
{
assert(0);
printf("Failed 2\n");
return false;
}
for (uint32_t i = 0; i < num_codes; i++)
{
uint32_t s = d.decode_huffman(dtab);
if (s != syms[i])
{
assert(0);
printf("Failed 4\n");
return false;
}
}
}
return true;
}
void palette_index_reorderer::init(uint32_t num_indices, const uint32_t *pIndices, uint32_t num_syms, pEntry_dist_func pDist_func, void *pCtx, float dist_func_weight)
{
assert((num_syms > 0) && (num_indices > 0));
assert((dist_func_weight >= 0.0f) && (dist_func_weight <= 1.0f));