third_party/libwebp/dsp/dsp.h

// Copyright 2011 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.
// -----------------------------------------------------------------------------
//
//   Speed-critical functions.
//
// Author: Skal (pascal.massimino@gmail.com)

#ifndef WEBP_DSP_DSP_H_
#define WEBP_DSP_DSP_H_

#ifdef HAVE_CONFIG_H
#include "../webp/config.h"
#endif

#include "../webp/types.h"

#ifdef __cplusplus
extern "C" {
#endif

//------------------------------------------------------------------------------
// CPU detection

#if defined(__GNUC__)
# define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
# define LOCAL_GCC_PREREQ(maj, min) \
    (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
#else
# define LOCAL_GCC_PREREQ(maj, min) 0
#endif

#if defined(_MSC_VER) && _MSC_VER > 1310 && \
    (defined(_M_X64) || defined(_M_IX86))
#define WEBP_MSC_SSE2  // Visual C++ SSE2 targets
#endif

// WEBP_HAVE_* are used to indicate the presence of the instruction set in dsp
// files without intrinsics, allowing the corresponding Init() to be called.
// Files containing intrinsics will need to be built targeting the instruction
// set so should succeed on one of the earlier tests.
#if defined(__SSE2__) || defined(WEBP_MSC_SSE2) || defined(WEBP_HAVE_SSE2)
#define WEBP_USE_SSE2
#endif

#if defined(__AVX2__) || defined(WEBP_HAVE_AVX2)
#define WEBP_USE_AVX2
#endif

#if defined(__ANDROID__) && defined(__ARM_ARCH_7A__)
#define WEBP_ANDROID_NEON  // Android targets that might support NEON
#endif

#if defined(__ARM_NEON__) || defined(WEBP_ANDROID_NEON) || defined(__aarch64__)
#define WEBP_USE_NEON
#endif

#if defined(__mips__) && !defined(__mips64) && (__mips_isa_rev < 6)
#define WEBP_USE_MIPS32
#endif

typedef enum {
  kSSE2,
  kSSE3,
  kAVX,
  kAVX2,
  kNEON,
  kMIPS32
} CPUFeature;
// returns true if the CPU supports the feature.
typedef int (*VP8CPUInfo)(CPUFeature feature);
extern VP8CPUInfo VP8GetCPUInfo;

//------------------------------------------------------------------------------
// Encoding

// Transforms
// VP8Idct: Does one of two inverse transforms. If do_two is set, the transforms
//          will be done for (ref, in, dst) and (ref + 4, in + 16, dst + 4).
typedef void (*VP8Idct)(const uint8_t* ref, const int16_t* in, uint8_t* dst,
                        int do_two);
typedef void (*VP8Fdct)(const uint8_t* src, const uint8_t* ref, int16_t* out);
typedef void (*VP8WHT)(const int16_t* in, int16_t* out);
extern VP8Idct VP8ITransform;
extern VP8Fdct VP8FTransform;
extern VP8WHT VP8FTransformWHT;
// Predictions
// *dst is the destination block. *top and *left can be NULL.
typedef void (*VP8IntraPreds)(uint8_t *dst, const uint8_t* left,
                              const uint8_t* top);
typedef void (*VP8Intra4Preds)(uint8_t *dst, const uint8_t* top);
extern VP8Intra4Preds VP8EncPredLuma4;
extern VP8IntraPreds VP8EncPredLuma16;
extern VP8IntraPreds VP8EncPredChroma8;

typedef int (*VP8Metric)(const uint8_t* pix, const uint8_t* ref);
extern VP8Metric VP8SSE16x16, VP8SSE16x8, VP8SSE8x8, VP8SSE4x4;
typedef int (*VP8WMetric)(const uint8_t* pix, const uint8_t* ref,
                          const uint16_t* const weights);
extern VP8WMetric VP8TDisto4x4, VP8TDisto16x16;

typedef void (*VP8BlockCopy)(const uint8_t* src, uint8_t* dst);
extern VP8BlockCopy VP8Copy4x4;
// Quantization
struct VP8Matrix;   // forward declaration
typedef int (*VP8QuantizeBlock)(int16_t in[16], int16_t out[16],
                                const struct VP8Matrix* const mtx);
extern VP8QuantizeBlock VP8EncQuantizeBlock;

// specific to 2nd transform:
typedef int (*VP8QuantizeBlockWHT)(int16_t in[16], int16_t out[16],
                                   const struct VP8Matrix* const mtx);
extern VP8QuantizeBlockWHT VP8EncQuantizeBlockWHT;

// Collect histogram for susceptibility calculation and accumulate in histo[].
struct VP8Histogram;
typedef void (*VP8CHisto)(const uint8_t* ref, const uint8_t* pred,
                          int start_block, int end_block,
                          struct VP8Histogram* const histo);
extern const int VP8DspScan[16 + 4 + 4];
extern VP8CHisto VP8CollectHistogram;

void VP8EncDspInit(void);   // must be called before using any of the above

//------------------------------------------------------------------------------
// Decoding

typedef void (*VP8DecIdct)(const int16_t* coeffs, uint8_t* dst);
// when doing two transforms, coeffs is actually int16_t[2][16].
typedef void (*VP8DecIdct2)(const int16_t* coeffs, uint8_t* dst, int do_two);
extern VP8DecIdct2 VP8Transform;
extern VP8DecIdct VP8TransformAC3;
extern VP8DecIdct VP8TransformUV;
extern VP8DecIdct VP8TransformDC;
extern VP8DecIdct VP8TransformDCUV;
extern VP8WHT VP8TransformWHT;

// *dst is the destination block, with stride BPS. Boundary samples are
// assumed accessible when needed.
typedef void (*VP8PredFunc)(uint8_t* dst);
extern const VP8PredFunc VP8PredLuma16[/* NUM_B_DC_MODES */];
extern const VP8PredFunc VP8PredChroma8[/* NUM_B_DC_MODES */];
extern const VP8PredFunc VP8PredLuma4[/* NUM_BMODES */];

// clipping tables (for filtering)
extern const int8_t* const VP8ksclip1;  // clips [-1020, 1020] to [-128, 127]
extern const int8_t* const VP8ksclip2;  // clips [-112, 112] to [-16, 15]
extern const uint8_t* const VP8kclip1;  // clips [-255,511] to [0,255]
extern const uint8_t* const VP8kabs0;   // abs(x) for x in [-255,255]
void VP8InitClipTables(void);           // must be called first

// simple filter (only for luma)
typedef void (*VP8SimpleFilterFunc)(uint8_t* p, int stride, int thresh);
extern VP8SimpleFilterFunc VP8SimpleVFilter16;
extern VP8SimpleFilterFunc VP8SimpleHFilter16;
extern VP8SimpleFilterFunc VP8SimpleVFilter16i;  // filter 3 inner edges
extern VP8SimpleFilterFunc VP8SimpleHFilter16i;

// regular filter (on both macroblock edges and inner edges)
typedef void (*VP8LumaFilterFunc)(uint8_t* luma, int stride,
                                  int thresh, int ithresh, int hev_t);
typedef void (*VP8ChromaFilterFunc)(uint8_t* u, uint8_t* v, int stride,
                                    int thresh, int ithresh, int hev_t);
// on outer edge
extern VP8LumaFilterFunc VP8VFilter16;
extern VP8LumaFilterFunc VP8HFilter16;
extern VP8ChromaFilterFunc VP8VFilter8;
extern VP8ChromaFilterFunc VP8HFilter8;

// on inner edge
extern VP8LumaFilterFunc VP8VFilter16i;   // filtering 3 inner edges altogether
extern VP8LumaFilterFunc VP8HFilter16i;
extern VP8ChromaFilterFunc VP8VFilter8i;  // filtering u and v altogether
extern VP8ChromaFilterFunc VP8HFilter8i;

// must be called before anything using the above
void VP8DspInit(void);

//------------------------------------------------------------------------------
// WebP I/O

#define FANCY_UPSAMPLING   // undefined to remove fancy upsampling support

// Convert a pair of y/u/v lines together to the output rgb/a colorspace.
// bottom_y can be NULL if only one line of output is needed (at top/bottom).
typedef void (*WebPUpsampleLinePairFunc)(
    const uint8_t* top_y, const uint8_t* bottom_y,
    const uint8_t* top_u, const uint8_t* top_v,
    const uint8_t* cur_u, const uint8_t* cur_v,
    uint8_t* top_dst, uint8_t* bottom_dst, int len);

#ifdef FANCY_UPSAMPLING

// Fancy upsampling functions to convert YUV to RGB(A) modes
extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];

#endif    // FANCY_UPSAMPLING

// Per-row point-sampling methods.
typedef void (*WebPSamplerRowFunc)(const uint8_t* y,
                                   const uint8_t* u, const uint8_t* v,
                                   uint8_t* dst, int len);
// Generic function to apply 'WebPSamplerRowFunc' to the whole plane:
void WebPSamplerProcessPlane(const uint8_t* y, int y_stride,
                             const uint8_t* u, const uint8_t* v, int uv_stride,
                             uint8_t* dst, int dst_stride,
                             int width, int height, WebPSamplerRowFunc func);

// Sampling functions to convert rows of YUV to RGB(A)
extern WebPSamplerRowFunc WebPSamplers[/* MODE_LAST */];

// General function for converting two lines of ARGB or RGBA.
// 'alpha_is_last' should be true if 0xff000000 is stored in memory as
// as 0x00, 0x00, 0x00, 0xff (little endian).
WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last);

// YUV444->RGB converters
typedef void (*WebPYUV444Converter)(const uint8_t* y,
                                    const uint8_t* u, const uint8_t* v,
                                    uint8_t* dst, int len);

extern const WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];

// Must be called before using the WebPUpsamplers[] (and for premultiplied
// colorspaces like rgbA, rgbA4444, etc)
void WebPInitUpsamplers(void);
// Must be called before using WebPSamplers[]
void WebPInitSamplers(void);

//------------------------------------------------------------------------------
// Utilities for processing transparent channel.

// Apply alpha pre-multiply on an rgba, bgra or argb plane of size w * h.
// alpha_first should be 0 for argb, 1 for rgba or bgra (where alpha is last).
extern void (*WebPApplyAlphaMultiply)(
    uint8_t* rgba, int alpha_first, int w, int h, int stride);

// Same, buf specifically for RGBA4444 format
extern void (*WebPApplyAlphaMultiply4444)(
    uint8_t* rgba4444, int w, int h, int stride);

// Pre-Multiply operation transforms x into x * A / 255  (where x=Y,R,G or B).
// Un-Multiply operation transforms x into x * 255 / A.

// Pre-Multiply or Un-Multiply (if 'inverse' is true) argb values in a row.
extern void (*WebPMultARGBRow)(uint32_t* const ptr, int width, int inverse);

// Same a WebPMultARGBRow(), but for several rows.
void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows,
                      int inverse);

// Same for a row of single values, with side alpha values.
extern void (*WebPMultRow)(uint8_t* const ptr, const uint8_t* const alpha,
                           int width, int inverse);

// Same a WebPMultRow(), but for several 'num_rows' rows.
void WebPMultRows(uint8_t* ptr, int stride,
                  const uint8_t* alpha, int alpha_stride,
                  int width, int num_rows, int inverse);

// To be called first before using the above.
void WebPInitAlphaProcessing(void);

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_DSP_DSP_H_ */