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libwebp/src/dsp/yuv.c
James Zern b7971d0e22 dsp: avoid defining _C functions w/NEON builds 
when targeting NEON C functions with NEON equivalents won't be used, but
will contribute to binary size. the same goes for sse2, etc., but this
change is primarily concerned with binary sizes for android arm targets.

note '-noasm' or otherwise modifying VP8GetCPUInfo will have no effect
on the use of NEON functions.

this decision can be overridden by defining WEBP_DSP_OMIT_C_CODE to 0.

Change-Id: I47bd453c84a3d341ca39bc986a39eb9c785aface
2017-10-27 10:54:56 -07:00

310 lines
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// Copyright 2010 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->RGB conversion functions
//
// Author: Skal (pascal.massimino@gmail.com)
#include "src/dsp/yuv.h"
#include <assert.h>
#include <stdlib.h>
//-----------------------------------------------------------------------------
// Plain-C version
#define ROW_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) { \
const uint8_t* const end = dst + (len & ~1) * (XSTEP); \
while (dst != end) { \
FUNC(y[0], u[0], v[0], dst); \
FUNC(y[1], u[0], v[0], dst + (XSTEP)); \
y += 2; \
++u; \
++v; \
dst += 2 * (XSTEP); \
} \
if (len & 1) { \
FUNC(y[0], u[0], v[0], dst); \
} \
} \
// All variants implemented.
ROW_FUNC(YuvToRgbRow, VP8YuvToRgb, 3)
ROW_FUNC(YuvToBgrRow, VP8YuvToBgr, 3)
ROW_FUNC(YuvToRgbaRow, VP8YuvToRgba, 4)
ROW_FUNC(YuvToBgraRow, VP8YuvToBgra, 4)
ROW_FUNC(YuvToArgbRow, VP8YuvToArgb, 4)
ROW_FUNC(YuvToRgba4444Row, VP8YuvToRgba4444, 2)
ROW_FUNC(YuvToRgb565Row, VP8YuvToRgb565, 2)
#undef ROW_FUNC
// Main call for processing a plane with a WebPSamplerRowFunc function:
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) {
int j;
for (j = 0; j < height; ++j) {
func(y, u, v, dst, width);
y += y_stride;
if (j & 1) {
u += uv_stride;
v += uv_stride;
}
dst += dst_stride;
}
}
//-----------------------------------------------------------------------------
// Main call
WebPSamplerRowFunc WebPSamplers[MODE_LAST];
extern void WebPInitSamplersSSE2(void);
extern void WebPInitSamplersMIPS32(void);
extern void WebPInitSamplersMIPSdspR2(void);
static volatile VP8CPUInfo yuv_last_cpuinfo_used =
(VP8CPUInfo)&yuv_last_cpuinfo_used;
WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplers(void) {
if (yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
WebPSamplers[MODE_RGB] = YuvToRgbRow;
WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
WebPSamplers[MODE_BGR] = YuvToBgrRow;
WebPSamplers[MODE_BGRA] = YuvToBgraRow;
WebPSamplers[MODE_ARGB] = YuvToArgbRow;
WebPSamplers[MODE_RGBA_4444] = YuvToRgba4444Row;
WebPSamplers[MODE_RGB_565] = YuvToRgb565Row;
WebPSamplers[MODE_rgbA] = YuvToRgbaRow;
WebPSamplers[MODE_bgrA] = YuvToBgraRow;
WebPSamplers[MODE_Argb] = YuvToArgbRow;
WebPSamplers[MODE_rgbA_4444] = YuvToRgba4444Row;
// If defined, use CPUInfo() to overwrite some pointers with faster versions.
if (VP8GetCPUInfo != NULL) {
#if defined(WEBP_USE_SSE2)
if (VP8GetCPUInfo(kSSE2)) {
WebPInitSamplersSSE2();
}
#endif // WEBP_USE_SSE2
#if defined(WEBP_USE_MIPS32)
if (VP8GetCPUInfo(kMIPS32)) {
WebPInitSamplersMIPS32();
}
#endif // WEBP_USE_MIPS32
#if defined(WEBP_USE_MIPS_DSP_R2)
if (VP8GetCPUInfo(kMIPSdspR2)) {
WebPInitSamplersMIPSdspR2();
}
#endif // WEBP_USE_MIPS_DSP_R2
}
yuv_last_cpuinfo_used = VP8GetCPUInfo;
}
//-----------------------------------------------------------------------------
// ARGB -> YUV converters
static void ConvertARGBToY_C(const uint32_t* argb, uint8_t* y, int width) {
int i;
for (i = 0; i < width; ++i) {
const uint32_t p = argb[i];
y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >> 0) & 0xff,
YUV_HALF);
}
}
void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v,
int src_width, int do_store) {
// No rounding. Last pixel is dealt with separately.
const int uv_width = src_width >> 1;
int i;
for (i = 0; i < uv_width; ++i) {
const uint32_t v0 = argb[2 * i + 0];
const uint32_t v1 = argb[2 * i + 1];
// VP8RGBToU/V expects four accumulated pixels. Hence we need to
// scale r/g/b value by a factor 2. We just shift v0/v1 one bit less.
const int r = ((v0 >> 15) & 0x1fe) + ((v1 >> 15) & 0x1fe);
const int g = ((v0 >> 7) & 0x1fe) + ((v1 >> 7) & 0x1fe);
const int b = ((v0 << 1) & 0x1fe) + ((v1 << 1) & 0x1fe);
const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);
const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);
if (do_store) {
u[i] = tmp_u;
v[i] = tmp_v;
} else {
// Approximated average-of-four. But it's an acceptable diff.
u[i] = (u[i] + tmp_u + 1) >> 1;
v[i] = (v[i] + tmp_v + 1) >> 1;
}
}
if (src_width & 1) { // last pixel
const uint32_t v0 = argb[2 * i + 0];
const int r = (v0 >> 14) & 0x3fc;
const int g = (v0 >> 6) & 0x3fc;
const int b = (v0 << 2) & 0x3fc;
const int tmp_u = VP8RGBToU(r, g, b, YUV_HALF << 2);
const int tmp_v = VP8RGBToV(r, g, b, YUV_HALF << 2);
if (do_store) {
u[i] = tmp_u;
v[i] = tmp_v;
} else {
u[i] = (u[i] + tmp_u + 1) >> 1;
v[i] = (v[i] + tmp_v + 1) >> 1;
}
}
}
//-----------------------------------------------------------------------------
static void ConvertRGB24ToY_C(const uint8_t* rgb, uint8_t* y, int width) {
int i;
for (i = 0; i < width; ++i, rgb += 3) {
y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF);
}
}
static void ConvertBGR24ToY_C(const uint8_t* bgr, uint8_t* y, int width) {
int i;
for (i = 0; i < width; ++i, bgr += 3) {
y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF);
}
}
void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,
uint8_t* u, uint8_t* v, int width) {
int i;
for (i = 0; i < width; i += 1, rgb += 4) {
const int r = rgb[0], g = rgb[1], b = rgb[2];
u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2);
v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2);
}
}
//-----------------------------------------------------------------------------
#if !WEBP_NEON_OMIT_C_CODE
#define MAX_Y ((1 << 10) - 1) // 10b precision over 16b-arithmetic
static uint16_t clip_y(int v) {
return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
}
static uint64_t SharpYUVUpdateY_C(const uint16_t* ref, const uint16_t* src,
uint16_t* dst, int len) {
uint64_t diff = 0;
int i;
for (i = 0; i < len; ++i) {
const int diff_y = ref[i] - src[i];
const int new_y = (int)dst[i] + diff_y;
dst[i] = clip_y(new_y);
diff += (uint64_t)abs(diff_y);
}
return diff;
}
static void SharpYUVUpdateRGB_C(const int16_t* ref, const int16_t* src,
int16_t* dst, int len) {
int i;
for (i = 0; i < len; ++i) {
const int diff_uv = ref[i] - src[i];
dst[i] += diff_uv;
}
}
static void SharpYUVFilterRow_C(const int16_t* A, const int16_t* B, int len,
const uint16_t* best_y, uint16_t* out) {
int i;
for (i = 0; i < len; ++i, ++A, ++B) {
const int v0 = (A[0] * 9 + A[1] * 3 + B[0] * 3 + B[1] + 8) >> 4;
const int v1 = (A[1] * 9 + A[0] * 3 + B[1] * 3 + B[0] + 8) >> 4;
out[2 * i + 0] = clip_y(best_y[2 * i + 0] + v0);
out[2 * i + 1] = clip_y(best_y[2 * i + 1] + v1);
}
}
#endif // !WEBP_NEON_OMIT_C_CODE
#undef MAX_Y
//-----------------------------------------------------------------------------
void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width);
void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width);
void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb,
uint8_t* u, uint8_t* v, int width);
void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width);
void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v,
int src_width, int do_store);
uint64_t (*WebPSharpYUVUpdateY)(const uint16_t* ref, const uint16_t* src,
uint16_t* dst, int len);
void (*WebPSharpYUVUpdateRGB)(const int16_t* ref, const int16_t* src,
int16_t* dst, int len);
void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B, int len,
const uint16_t* best_y, uint16_t* out);
static volatile VP8CPUInfo rgba_to_yuv_last_cpuinfo_used =
(VP8CPUInfo)&rgba_to_yuv_last_cpuinfo_used;
extern void WebPInitConvertARGBToYUVSSE2(void);
extern void WebPInitConvertARGBToYUVNEON(void);
extern void WebPInitSharpYUVSSE2(void);
extern void WebPInitSharpYUVNEON(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUV(void) {
if (rgba_to_yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
WebPConvertARGBToY = ConvertARGBToY_C;
WebPConvertARGBToUV = WebPConvertARGBToUV_C;
WebPConvertRGB24ToY = ConvertRGB24ToY_C;
WebPConvertBGR24ToY = ConvertBGR24ToY_C;
WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;
#if !WEBP_NEON_OMIT_C_CODE
WebPSharpYUVUpdateY = SharpYUVUpdateY_C;
WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_C;
WebPSharpYUVFilterRow = SharpYUVFilterRow_C;
#endif
if (VP8GetCPUInfo != NULL) {
#if defined(WEBP_USE_SSE2)
if (VP8GetCPUInfo(kSSE2)) {
WebPInitConvertARGBToYUVSSE2();
WebPInitSharpYUVSSE2();
}
#endif // WEBP_USE_SSE2
}
#if defined(WEBP_USE_NEON)
if (WEBP_NEON_OMIT_C_CODE ||
(VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
WebPInitConvertARGBToYUVNEON();
WebPInitSharpYUVNEON();
}
#endif // WEBP_USE_NEON
assert(WebPConvertARGBToY != NULL);
assert(WebPConvertARGBToUV != NULL);
assert(WebPConvertRGB24ToY != NULL);
assert(WebPConvertBGR24ToY != NULL);
assert(WebPConvertRGBA32ToUV != NULL);
assert(WebPSharpYUVUpdateY != NULL);
assert(WebPSharpYUVUpdateRGB != NULL);
assert(WebPSharpYUVFilterRow != NULL);
rgba_to_yuv_last_cpuinfo_used = VP8GetCPUInfo;
}
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