mirror of
https://github.com/webmproject/libwebp.git
synced 2024-11-20 12:28:26 +01:00
338 lines
12 KiB
C
338 lines
12 KiB
C
// 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 "./yuv.h"
|
|
|
|
#include <stdlib.h>
|
|
|
|
#if defined(WEBP_YUV_USE_TABLE)
|
|
|
|
static int done = 0;
|
|
|
|
static WEBP_INLINE uint8_t clip(int v, int max_value) {
|
|
return v < 0 ? 0 : v > max_value ? max_value : v;
|
|
}
|
|
|
|
int16_t VP8kVToR[256], VP8kUToB[256];
|
|
int32_t VP8kVToG[256], VP8kUToG[256];
|
|
uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
|
|
uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
|
|
|
|
WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {
|
|
int i;
|
|
if (done) {
|
|
return;
|
|
}
|
|
#ifndef USE_YUVj
|
|
for (i = 0; i < 256; ++i) {
|
|
VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
|
|
VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
|
|
VP8kVToG[i] = -45773 * (i - 128);
|
|
VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX;
|
|
}
|
|
for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
|
|
const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX;
|
|
VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
|
|
VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
|
|
}
|
|
#else
|
|
for (i = 0; i < 256; ++i) {
|
|
VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX;
|
|
VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF;
|
|
VP8kVToG[i] = -46802 * (i - 128);
|
|
VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX;
|
|
}
|
|
for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
|
|
const int k = i;
|
|
VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
|
|
VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
|
|
}
|
|
#endif
|
|
|
|
done = 1;
|
|
}
|
|
|
|
#else
|
|
|
|
WEBP_TSAN_IGNORE_FUNCTION void VP8YUVInit(void) {}
|
|
|
|
#endif // WEBP_YUV_USE_TABLE
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// 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(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(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(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);
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#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 SmartYUVUpdateY_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 SmartYUVUpdateRGB_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 SmartYUVFilterRow_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);
|
|
}
|
|
}
|
|
|
|
#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 (*WebPSmartYUVUpdateY)(const uint16_t* ref, const uint16_t* src,
|
|
uint16_t* dst, int len);
|
|
void (*WebPSmartYUVUpdateRGB)(const int16_t* ref, const int16_t* src,
|
|
int16_t* dst, int len);
|
|
void (*WebPSmartYUVFilterRow)(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 WebPInitSmartYUVSSE2(void);
|
|
|
|
WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUV(void) {
|
|
if (rgba_to_yuv_last_cpuinfo_used == VP8GetCPUInfo) return;
|
|
|
|
WebPConvertARGBToY = ConvertARGBToY;
|
|
WebPConvertARGBToUV = WebPConvertARGBToUV_C;
|
|
|
|
WebPConvertRGB24ToY = ConvertRGB24ToY;
|
|
WebPConvertBGR24ToY = ConvertBGR24ToY;
|
|
|
|
WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;
|
|
|
|
WebPSmartYUVUpdateY = SmartYUVUpdateY_C;
|
|
WebPSmartYUVUpdateRGB = SmartYUVUpdateRGB_C;
|
|
WebPSmartYUVFilterRow = SmartYUVFilterRow_C;
|
|
|
|
if (VP8GetCPUInfo != NULL) {
|
|
#if defined(WEBP_USE_SSE2)
|
|
if (VP8GetCPUInfo(kSSE2)) {
|
|
WebPInitConvertARGBToYUVSSE2();
|
|
WebPInitSmartYUVSSE2();
|
|
}
|
|
#endif // WEBP_USE_SSE2
|
|
}
|
|
rgba_to_yuv_last_cpuinfo_used = VP8GetCPUInfo;
|
|
}
|