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

// 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.
// -----------------------------------------------------------------------------
//
// YUV to RGB upsampling functions.
//
// Author: [email protected] (Somnath Banerjee)

#include "src/dsp/dsp.h"
#include "src/dsp/yuv.h"

#include <assert.h>

//------------------------------------------------------------------------------
// Fancy upsampler

#ifdef FANCY_UPSAMPLING

// Fancy upsampling functions to convert YUV to RGB
WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST];

// Given samples laid out in a square as:
//  [a b]
//  [c d]
// we interpolate u/v as:
//  ([9*a + 3*b + 3*c +   d    3*a + 9*b + 3*c +   d] + [8 8]) / 16
//  ([3*a +   b + 9*c + 3*d      a + 3*b + 3*c + 9*d]   [8 8]) / 16

// We process u and v together stashed into 32bit (16bit each).
#define LOAD_UV …

#define UPSAMPLE_FUNC …

// All variants implemented.
#if !WEBP_NEON_OMIT_C_CODE
UPSAMPLE_FUNC(UpsampleRgbaLinePair_C, VP8YuvToRgba, 4)
UPSAMPLE_FUNC(UpsampleBgraLinePair_C, VP8YuvToBgra, 4)
#if !defined(WEBP_REDUCE_CSP)
UPSAMPLE_FUNC(UpsampleArgbLinePair_C, VP8YuvToArgb, 4)
UPSAMPLE_FUNC(UpsampleRgbLinePair_C,  VP8YuvToRgb,  3)
UPSAMPLE_FUNC(UpsampleBgrLinePair_C,  VP8YuvToBgr,  3)
UPSAMPLE_FUNC(UpsampleRgba4444LinePair_C, VP8YuvToRgba4444, 2)
UPSAMPLE_FUNC(UpsampleRgb565LinePair_C,  VP8YuvToRgb565,  2)
#else
static void EmptyUpsampleFunc(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) {
  (void)top_y;
  (void)bottom_y;
  (void)top_u;
  (void)top_v;
  (void)cur_u;
  (void)cur_v;
  (void)top_dst;
  (void)bottom_dst;
  (void)len;
  assert(0);   // COLORSPACE SUPPORT NOT COMPILED
}
#define UpsampleArgbLinePair_C …
#define UpsampleRgbLinePair_C …
#define UpsampleBgrLinePair_C …
#define UpsampleRgba4444LinePair_C …
#define UpsampleRgb565LinePair_C …
#endif   // WEBP_REDUCE_CSP

#endif

#undef LOAD_UV
#undef UPSAMPLE_FUNC

#endif  // FANCY_UPSAMPLING

//------------------------------------------------------------------------------

#if !defined(FANCY_UPSAMPLING)
#define DUAL_SAMPLE_FUNC …

DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra)
DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb)
#undef DUAL_SAMPLE_FUNC

#endif  // !FANCY_UPSAMPLING

WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) { … }

//------------------------------------------------------------------------------
// YUV444 converter

#define YUV444_FUNC …

YUV444_FUNC(WebPYuv444ToRgba_C,     VP8YuvToRgba, 4)
YUV444_FUNC(WebPYuv444ToBgra_C,     VP8YuvToBgra, 4)
#if !defined(WEBP_REDUCE_CSP)
YUV444_FUNC(WebPYuv444ToRgb_C,      VP8YuvToRgb,  3)
YUV444_FUNC(WebPYuv444ToBgr_C,      VP8YuvToBgr,  3)
YUV444_FUNC(WebPYuv444ToArgb_C,     VP8YuvToArgb, 4)
YUV444_FUNC(WebPYuv444ToRgba4444_C, VP8YuvToRgba4444, 2)
YUV444_FUNC(WebPYuv444ToRgb565_C,   VP8YuvToRgb565, 2)
#else
static void EmptyYuv444Func(const uint8_t* y,
                            const uint8_t* u, const uint8_t* v,
                            uint8_t* dst, int len) {
  (void)y;
  (void)u;
  (void)v;
  (void)dst;
  (void)len;
}
#define WebPYuv444ToRgb_C …
#define WebPYuv444ToBgr_C …
#define WebPYuv444ToArgb_C …
#define WebPYuv444ToRgba4444_C …
#define WebPYuv444ToRgb565_C …
#endif   // WEBP_REDUCE_CSP

#undef YUV444_FUNC

WebPYUV444Converter WebPYUV444Converters[MODE_LAST];

extern VP8CPUInfo VP8GetCPUInfo;
extern void WebPInitYUV444ConvertersMIPSdspR2(void);
extern void WebPInitYUV444ConvertersSSE2(void);
extern void WebPInitYUV444ConvertersSSE41(void);

WEBP_DSP_INIT_FUNC(WebPInitYUV444Converters) { … }

//------------------------------------------------------------------------------
// Main calls

extern void WebPInitUpsamplersSSE2(void);
extern void WebPInitUpsamplersSSE41(void);
extern void WebPInitUpsamplersNEON(void);
extern void WebPInitUpsamplersMIPSdspR2(void);
extern void WebPInitUpsamplersMSA(void);

WEBP_DSP_INIT_FUNC(WebPInitUpsamplers) { … }

//------------------------------------------------------------------------------