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godot/thirdparty/libwebp/dsp/upsampling_mips_dsp_r2.c
Rémi Verschelde ee3cf211c6 webp: Make it a module and unbundle libwebp thirdparty files 
Note that there are two Godot-specific changes made to libwebp
for the javascript/HTML5 platform. They are documented in the
README.md.
2016-10-15 11:50:39 +02:00

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// 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.
// -----------------------------------------------------------------------------
//
// YUV to RGB upsampling functions.
//
// Author(s): Branimir Vasic (branimir.vasic@imgtec.com)
// Djordje Pesut (djordje.pesut@imgtec.com)
#include "./dsp.h"
#if defined(WEBP_USE_MIPS_DSP_R2)
#include <assert.h>
#include "./yuv.h"
#if !defined(WEBP_YUV_USE_TABLE)
#define YUV_TO_RGB(Y, U, V, R, G, B) do { \
const int t1 = MultHi(Y, 19077); \
const int t2 = MultHi(V, 13320); \
R = MultHi(V, 26149); \
G = MultHi(U, 6419); \
B = MultHi(U, 33050); \
R = t1 + R; \
G = t1 - G; \
B = t1 + B; \
R = R - 14234; \
G = G - t2 + 8708; \
B = B - 17685; \
__asm__ volatile ( \
"shll_s.w %[" #R "], %[" #R "], 17 \n\t" \
"shll_s.w %[" #G "], %[" #G "], 17 \n\t" \
"shll_s.w %[" #B "], %[" #B "], 17 \n\t" \
"precrqu_s.qb.ph %[" #R "], %[" #R "], $zero \n\t" \
"precrqu_s.qb.ph %[" #G "], %[" #G "], $zero \n\t" \
"precrqu_s.qb.ph %[" #B "], %[" #B "], $zero \n\t" \
"srl %[" #R "], %[" #R "], 24 \n\t" \
"srl %[" #G "], %[" #G "], 24 \n\t" \
"srl %[" #B "], %[" #B "], 24 \n\t" \
: [R]"+r"(R), [G]"+r"(G), [B]"+r"(B) \
: \
); \
} while (0)
static WEBP_INLINE void YuvToRgb(int y, int u, int v, uint8_t* const rgb) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
rgb[0] = r;
rgb[1] = g;
rgb[2] = b;
}
static WEBP_INLINE void YuvToBgr(int y, int u, int v, uint8_t* const bgr) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
bgr[0] = b;
bgr[1] = g;
bgr[2] = r;
}
static WEBP_INLINE void YuvToRgb565(int y, int u, int v, uint8_t* const rgb) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
{
const int rg = (r & 0xf8) | (g >> 5);
const int gb = ((g << 3) & 0xe0) | (b >> 3);
#ifdef WEBP_SWAP_16BIT_CSP
rgb[0] = gb;
rgb[1] = rg;
#else
rgb[0] = rg;
rgb[1] = gb;
#endif
}
}
static WEBP_INLINE void YuvToRgba4444(int y, int u, int v,
uint8_t* const argb) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
{
const int rg = (r & 0xf0) | (g >> 4);
const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits
#ifdef WEBP_SWAP_16BIT_CSP
argb[0] = ba;
argb[1] = rg;
#else
argb[0] = rg;
argb[1] = ba;
#endif
}
}
#endif // WEBP_YUV_USE_TABLE
//-----------------------------------------------------------------------------
// Alpha handling variants
static WEBP_INLINE void YuvToArgb(uint8_t y, uint8_t u, uint8_t v,
uint8_t* const argb) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
argb[0] = 0xff;
argb[1] = r;
argb[2] = g;
argb[3] = b;
}
static WEBP_INLINE void YuvToBgra(uint8_t y, uint8_t u, uint8_t v,
uint8_t* const bgra) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
bgra[0] = b;
bgra[1] = g;
bgra[2] = r;
bgra[3] = 0xff;
}
static WEBP_INLINE void YuvToRgba(uint8_t y, uint8_t u, uint8_t v,
uint8_t* const rgba) {
int r, g, b;
YUV_TO_RGB(y, u, v, r, g, b);
rgba[0] = r;
rgba[1] = g;
rgba[2] = b;
rgba[3] = 0xff;
}
//------------------------------------------------------------------------------
// Fancy upsampler
#ifdef FANCY_UPSAMPLING
// 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(u, v) ((u) | ((v) << 16))
#define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
static void FUNC_NAME(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) { \
int x; \
const int last_pixel_pair = (len - 1) >> 1; \
uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \
uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \
assert(top_y != NULL); \
{ \
const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \
} \
if (bottom_y != NULL) { \
const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \
} \
for (x = 1; x <= last_pixel_pair; ++x) { \
const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \
const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \
/* precompute invariant values associated with first and second diagonals*/\
const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \
const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \
const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \
{ \
const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \
const uint32_t uv1 = (diag_03 + t_uv) >> 1; \
FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
top_dst + (2 * x - 1) * XSTEP); \
FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \
top_dst + (2 * x - 0) * XSTEP); \
} \
if (bottom_y != NULL) { \
const uint32_t uv0 = (diag_03 + l_uv) >> 1; \
const uint32_t uv1 = (diag_12 + uv) >> 1; \
FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \
bottom_dst + (2 * x - 1) * XSTEP); \
FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \
bottom_dst + (2 * x + 0) * XSTEP); \
} \
tl_uv = t_uv; \
l_uv = uv; \
} \
if (!(len & 1)) { \
{ \
const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \
FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
top_dst + (len - 1) * XSTEP); \
} \
if (bottom_y != NULL) { \
const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \
FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \
bottom_dst + (len - 1) * XSTEP); \
} \
} \
}
// All variants implemented.
UPSAMPLE_FUNC(UpsampleRgbLinePair, YuvToRgb, 3)
UPSAMPLE_FUNC(UpsampleBgrLinePair, YuvToBgr, 3)
UPSAMPLE_FUNC(UpsampleRgbaLinePair, YuvToRgba, 4)
UPSAMPLE_FUNC(UpsampleBgraLinePair, YuvToBgra, 4)
UPSAMPLE_FUNC(UpsampleArgbLinePair, YuvToArgb, 4)
UPSAMPLE_FUNC(UpsampleRgba4444LinePair, YuvToRgba4444, 2)
UPSAMPLE_FUNC(UpsampleRgb565LinePair, YuvToRgb565, 2)
#undef LOAD_UV
#undef UPSAMPLE_FUNC
//------------------------------------------------------------------------------
// Entry point
extern void WebPInitUpsamplersMIPSdspR2(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void) {
WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair;
WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
}
#endif // FANCY_UPSAMPLING
//------------------------------------------------------------------------------
// YUV444 converter
#define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \
static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \
uint8_t* dst, int len) { \
int i; \
for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \
}
YUV444_FUNC(Yuv444ToRgb, YuvToRgb, 3)
YUV444_FUNC(Yuv444ToBgr, YuvToBgr, 3)
YUV444_FUNC(Yuv444ToRgba, YuvToRgba, 4)
YUV444_FUNC(Yuv444ToBgra, YuvToBgra, 4)
YUV444_FUNC(Yuv444ToArgb, YuvToArgb, 4)
YUV444_FUNC(Yuv444ToRgba4444, YuvToRgba4444, 2)
YUV444_FUNC(Yuv444ToRgb565, YuvToRgb565, 2)
#undef YUV444_FUNC
//------------------------------------------------------------------------------
// Entry point
extern void WebPInitYUV444ConvertersMIPSdspR2(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) {
WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb;
WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba;
WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr;
WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra;
WebPYUV444Converters[MODE_ARGB] = Yuv444ToArgb;
WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444;
WebPYUV444Converters[MODE_RGB_565] = Yuv444ToRgb565;
WebPYUV444Converters[MODE_rgbA] = Yuv444ToRgba;
WebPYUV444Converters[MODE_bgrA] = Yuv444ToBgra;
WebPYUV444Converters[MODE_Argb] = Yuv444ToArgb;
WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444;
}
#else // !WEBP_USE_MIPS_DSP_R2
WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2)
#endif // WEBP_USE_MIPS_DSP_R2
#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2))
WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2)
#endif
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