godot/thirdparty/libwebp/src/dsp/dec_clip_tables.c

// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Clipping tables for filtering
//
// Author: Skal ([email protected])

#include "src/dsp/dsp.h"

// define to 0 to have run-time table initialization
#if !defined(USE_STATIC_TABLES)
#define USE_STATIC_TABLES …
#endif

#if (USE_STATIC_TABLES == 1)

static const uint8_t abs0[255 + 255 + 1] = …;

static const uint8_t sclip1[1020 + 1020 + 1] = …;

static const uint8_t sclip2[112 + 112 + 1] = …;

static const uint8_t clip1[255 + 511 + 1] = …;

#else

// uninitialized tables
static uint8_t abs0[255 + 255 + 1];
static int8_t sclip1[1020 + 1020 + 1];
static int8_t sclip2[112 + 112 + 1];
static uint8_t clip1[255 + 511 + 1];

// We declare this variable 'volatile' to prevent instruction reordering
// and make sure it's set to true _last_ (so as to be thread-safe)
static volatile int tables_ok = 0;

#endif    // USE_STATIC_TABLES

const int8_t* const VP8ksclip1 = …;
const int8_t* const VP8ksclip2 = …;
const uint8_t* const VP8kclip1 = …;
const uint8_t* const VP8kabs0 = …;

WEBP_TSAN_IGNORE_FUNCTION void VP8InitClipTables(void) { … }