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-rw-r--r--drivers/webp/dsp/yuv.h285
1 files changed, 48 insertions, 237 deletions
diff --git a/drivers/webp/dsp/yuv.h b/drivers/webp/dsp/yuv.h
index dd778f9cbe..a569109c54 100644
--- a/drivers/webp/dsp/yuv.h
+++ b/drivers/webp/dsp/yuv.h
@@ -1,165 +1,36 @@
// 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.
+// This code is licensed under the same terms as WebM:
+// Software License Agreement: http://www.webmproject.org/license/software/
+// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// inline YUV<->RGB conversion function
//
-// The exact naming is Y'CbCr, following the ITU-R BT.601 standard.
-// More information at: http://en.wikipedia.org/wiki/YCbCr
-// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16
-// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128
-// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128
-// We use 16bit fixed point operations for RGB->YUV conversion (YUV_FIX).
-//
-// For the Y'CbCr to RGB conversion, the BT.601 specification reads:
-// R = 1.164 * (Y-16) + 1.596 * (V-128)
-// G = 1.164 * (Y-16) - 0.813 * (V-128) - 0.391 * (U-128)
-// B = 1.164 * (Y-16) + 2.018 * (U-128)
-// where Y is in the [16,235] range, and U/V in the [16,240] range.
-// In the table-lookup version (WEBP_YUV_USE_TABLE), the common factor
-// "1.164 * (Y-16)" can be handled as an offset in the VP8kClip[] table.
-// So in this case the formulae should read:
-// R = 1.164 * [Y + 1.371 * (V-128) ] - 18.624
-// G = 1.164 * [Y - 0.698 * (V-128) - 0.336 * (U-128)] - 18.624
-// B = 1.164 * [Y + 1.733 * (U-128)] - 18.624
-// once factorized.
-// For YUV->RGB conversion, only 14bit fixed precision is used (YUV_FIX2).
-// That's the maximum possible for a convenient ARM implementation.
-//
// Author: Skal (pascal.massimino@gmail.com)
#ifndef WEBP_DSP_YUV_H_
#define WEBP_DSP_YUV_H_
-#include "./dsp.h"
#include "../dec/decode_vp8.h"
-// Define the following to use the LUT-based code:
-// #define WEBP_YUV_USE_TABLE
-
-#if defined(WEBP_EXPERIMENTAL_FEATURES)
-// Do NOT activate this feature for real compression. This is only experimental!
-// This flag is for comparison purpose against JPEG's "YUVj" natural colorspace.
-// This colorspace is close to Rec.601's Y'CbCr model with the notable
-// difference of allowing larger range for luma/chroma.
-// See http://en.wikipedia.org/wiki/YCbCr#JPEG_conversion paragraph, and its
-// difference with http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
-// #define USE_YUVj
-#endif
-
//------------------------------------------------------------------------------
// YUV -> RGB conversion
-#ifdef __cplusplus
+#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
-enum {
- YUV_FIX = 16, // fixed-point precision for RGB->YUV
- YUV_HALF = 1 << (YUV_FIX - 1),
- YUV_MASK = (256 << YUV_FIX) - 1,
- YUV_RANGE_MIN = -227, // min value of r/g/b output
- YUV_RANGE_MAX = 256 + 226, // max value of r/g/b output
-
- YUV_FIX2 = 14, // fixed-point precision for YUV->RGB
- YUV_HALF2 = 1 << (YUV_FIX2 - 1),
- YUV_MASK2 = (256 << YUV_FIX2) - 1
+enum { YUV_FIX = 16, // fixed-point precision
+ YUV_RANGE_MIN = -227, // min value of r/g/b output
+ YUV_RANGE_MAX = 256 + 226 // max value of r/g/b output
};
-
-// These constants are 14b fixed-point version of ITU-R BT.601 constants.
-#define kYScale 19077 // 1.164 = 255 / 219
-#define kVToR 26149 // 1.596 = 255 / 112 * 0.701
-#define kUToG 6419 // 0.391 = 255 / 112 * 0.886 * 0.114 / 0.587
-#define kVToG 13320 // 0.813 = 255 / 112 * 0.701 * 0.299 / 0.587
-#define kUToB 33050 // 2.018 = 255 / 112 * 0.886
-#define kRCst (-kYScale * 16 - kVToR * 128 + YUV_HALF2)
-#define kGCst (-kYScale * 16 + kUToG * 128 + kVToG * 128 + YUV_HALF2)
-#define kBCst (-kYScale * 16 - kUToB * 128 + YUV_HALF2)
-
-//------------------------------------------------------------------------------
-
-#if !defined(WEBP_YUV_USE_TABLE)
-
-// slower on x86 by ~7-8%, but bit-exact with the SSE2 version
-
-static WEBP_INLINE int VP8Clip8(int v) {
- return ((v & ~YUV_MASK2) == 0) ? (v >> YUV_FIX2) : (v < 0) ? 0 : 255;
-}
-
-static WEBP_INLINE int VP8YUVToR(int y, int v) {
- return VP8Clip8(kYScale * y + kVToR * v + kRCst);
-}
-
-static WEBP_INLINE int VP8YUVToG(int y, int u, int v) {
- return VP8Clip8(kYScale * y - kUToG * u - kVToG * v + kGCst);
-}
-
-static WEBP_INLINE int VP8YUVToB(int y, int u) {
- return VP8Clip8(kYScale * y + kUToB * u + kBCst);
-}
-
-static WEBP_INLINE void VP8YuvToRgb(int y, int u, int v,
- uint8_t* const rgb) {
- rgb[0] = VP8YUVToR(y, v);
- rgb[1] = VP8YUVToG(y, u, v);
- rgb[2] = VP8YUVToB(y, u);
-}
-
-static WEBP_INLINE void VP8YuvToBgr(int y, int u, int v,
- uint8_t* const bgr) {
- bgr[0] = VP8YUVToB(y, u);
- bgr[1] = VP8YUVToG(y, u, v);
- bgr[2] = VP8YUVToR(y, v);
-}
-
-static WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v,
- uint8_t* const rgb) {
- const int r = VP8YUVToR(y, v); // 5 usable bits
- const int g = VP8YUVToG(y, u, v); // 6 usable bits
- const int b = VP8YUVToB(y, u); // 5 usable bits
- 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 VP8YuvToRgba4444(int y, int u, int v,
- uint8_t* const argb) {
- const int r = VP8YUVToR(y, v); // 4 usable bits
- const int g = VP8YUVToG(y, u, v); // 4 usable bits
- const int b = VP8YUVToB(y, u); // 4 usable bits
- 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
-}
-
-#else
-
-// Table-based version, not totally equivalent to the SSE2 version.
-// Rounding diff is only +/-1 though.
-
extern int16_t VP8kVToR[256], VP8kUToB[256];
extern int32_t VP8kVToG[256], VP8kUToG[256];
extern uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
extern uint8_t VP8kClip4Bits[YUV_RANGE_MAX - YUV_RANGE_MIN];
-static WEBP_INLINE void VP8YuvToRgb(int y, int u, int v,
+static WEBP_INLINE void VP8YuvToRgb(uint8_t y, uint8_t u, uint8_t v,
uint8_t* const rgb) {
const int r_off = VP8kVToR[v];
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
@@ -169,60 +40,42 @@ static WEBP_INLINE void VP8YuvToRgb(int y, int u, int v,
rgb[2] = VP8kClip[y + b_off - YUV_RANGE_MIN];
}
-static WEBP_INLINE void VP8YuvToBgr(int y, int u, int v,
- uint8_t* const bgr) {
+static WEBP_INLINE void VP8YuvToRgb565(uint8_t y, uint8_t u, uint8_t v,
+ uint8_t* const rgb) {
const int r_off = VP8kVToR[v];
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
const int b_off = VP8kUToB[u];
- bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN];
- bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN];
- bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN];
+ rgb[0] = ((VP8kClip[y + r_off - YUV_RANGE_MIN] & 0xf8) |
+ (VP8kClip[y + g_off - YUV_RANGE_MIN] >> 5));
+ rgb[1] = (((VP8kClip[y + g_off - YUV_RANGE_MIN] << 3) & 0xe0) |
+ (VP8kClip[y + b_off - YUV_RANGE_MIN] >> 3));
}
-static WEBP_INLINE void VP8YuvToRgb565(int y, int u, int v,
- uint8_t* const rgb) {
- const int r_off = VP8kVToR[v];
- const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
- const int b_off = VP8kUToB[u];
- const int rg = ((VP8kClip[y + r_off - YUV_RANGE_MIN] & 0xf8) |
- (VP8kClip[y + g_off - YUV_RANGE_MIN] >> 5));
- const int gb = (((VP8kClip[y + g_off - YUV_RANGE_MIN] << 3) & 0xe0) |
- (VP8kClip[y + b_off - YUV_RANGE_MIN] >> 3));
-#ifdef WEBP_SWAP_16BIT_CSP
- rgb[0] = gb;
- rgb[1] = rg;
-#else
- rgb[0] = rg;
- rgb[1] = gb;
-#endif
+static WEBP_INLINE void VP8YuvToArgb(uint8_t y, uint8_t u, uint8_t v,
+ uint8_t* const argb) {
+ argb[0] = 0xff;
+ VP8YuvToRgb(y, u, v, argb + 1);
}
-static WEBP_INLINE void VP8YuvToRgba4444(int y, int u, int v,
+static WEBP_INLINE void VP8YuvToRgba4444(uint8_t y, uint8_t u, uint8_t v,
uint8_t* const argb) {
const int r_off = VP8kVToR[v];
const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
const int b_off = VP8kUToB[u];
- const int rg = ((VP8kClip4Bits[y + r_off - YUV_RANGE_MIN] << 4) |
- VP8kClip4Bits[y + g_off - YUV_RANGE_MIN]);
- const int ba = (VP8kClip4Bits[y + b_off - YUV_RANGE_MIN] << 4) | 0x0f;
-#ifdef WEBP_SWAP_16BIT_CSP
- argb[0] = ba;
- argb[1] = rg;
-#else
- argb[0] = rg;
- argb[1] = ba;
-#endif
+ // Don't update alpha (last 4 bits of argb[1])
+ argb[0] = ((VP8kClip4Bits[y + r_off - YUV_RANGE_MIN] << 4) |
+ VP8kClip4Bits[y + g_off - YUV_RANGE_MIN]);
+ argb[1] = 0x0f | (VP8kClip4Bits[y + b_off - YUV_RANGE_MIN] << 4);
}
-#endif // WEBP_YUV_USE_TABLE
-
-//-----------------------------------------------------------------------------
-// Alpha handling variants
-
-static WEBP_INLINE void VP8YuvToArgb(uint8_t y, uint8_t u, uint8_t v,
- uint8_t* const argb) {
- argb[0] = 0xff;
- VP8YuvToRgb(y, u, v, argb + 1);
+static WEBP_INLINE void VP8YuvToBgr(uint8_t y, uint8_t u, uint8_t v,
+ uint8_t* const bgr) {
+ const int r_off = VP8kVToR[v];
+ const int g_off = (VP8kVToG[v] + VP8kUToG[u]) >> YUV_FIX;
+ const int b_off = VP8kUToB[u];
+ bgr[0] = VP8kClip[y + b_off - YUV_RANGE_MIN];
+ bgr[1] = VP8kClip[y + g_off - YUV_RANGE_MIN];
+ bgr[2] = VP8kClip[y + r_off - YUV_RANGE_MIN];
}
static WEBP_INLINE void VP8YuvToBgra(uint8_t y, uint8_t u, uint8_t v,
@@ -240,77 +93,35 @@ static WEBP_INLINE void VP8YuvToRgba(uint8_t y, uint8_t u, uint8_t v,
// Must be called before everything, to initialize the tables.
void VP8YUVInit(void);
-//-----------------------------------------------------------------------------
-// SSE2 extra functions (mostly for upsampling_sse2.c)
-
-#if defined(WEBP_USE_SSE2)
-
-#if defined(FANCY_UPSAMPLING)
-// Process 32 pixels and store the result (24b or 32b per pixel) in *dst.
-void VP8YuvToRgba32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
- uint8_t* dst);
-void VP8YuvToRgb32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
- uint8_t* dst);
-void VP8YuvToBgra32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
- uint8_t* dst);
-void VP8YuvToBgr32(const uint8_t* y, const uint8_t* u, const uint8_t* v,
- uint8_t* dst);
-#endif // FANCY_UPSAMPLING
-
-// Must be called to initialize tables before using the functions.
-void VP8YUVInitSSE2(void);
-
-#endif // WEBP_USE_SSE2
-
//------------------------------------------------------------------------------
// RGB -> YUV conversion
+// The exact naming is Y'CbCr, following the ITU-R BT.601 standard.
+// More information at: http://en.wikipedia.org/wiki/YCbCr
+// Y = 0.2569 * R + 0.5044 * G + 0.0979 * B + 16
+// U = -0.1483 * R - 0.2911 * G + 0.4394 * B + 128
+// V = 0.4394 * R - 0.3679 * G - 0.0715 * B + 128
+// We use 16bit fixed point operations.
-// Stub functions that can be called with various rounding values:
-static WEBP_INLINE int VP8ClipUV(int uv, int rounding) {
- uv = (uv + rounding + (128 << (YUV_FIX + 2))) >> (YUV_FIX + 2);
- return ((uv & ~0xff) == 0) ? uv : (uv < 0) ? 0 : 255;
+static WEBP_INLINE int VP8ClipUV(int v) {
+ v = (v + (257 << (YUV_FIX + 2 - 1))) >> (YUV_FIX + 2);
+ return ((v & ~0xff) == 0) ? v : (v < 0) ? 0 : 255;
}
-#ifndef USE_YUVj
-
-static WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) {
+static WEBP_INLINE int VP8RGBToY(int r, int g, int b) {
+ const int kRound = (1 << (YUV_FIX - 1)) + (16 << YUV_FIX);
const int luma = 16839 * r + 33059 * g + 6420 * b;
- return (luma + rounding + (16 << YUV_FIX)) >> YUV_FIX; // no need to clip
+ return (luma + kRound) >> YUV_FIX; // no need to clip
}
-static WEBP_INLINE int VP8RGBToU(int r, int g, int b, int rounding) {
- const int u = -9719 * r - 19081 * g + 28800 * b;
- return VP8ClipUV(u, rounding);
+static WEBP_INLINE int VP8RGBToU(int r, int g, int b) {
+ return VP8ClipUV(-9719 * r - 19081 * g + 28800 * b);
}
-static WEBP_INLINE int VP8RGBToV(int r, int g, int b, int rounding) {
- const int v = +28800 * r - 24116 * g - 4684 * b;
- return VP8ClipUV(v, rounding);
-}
-
-#else
-
-// This JPEG-YUV colorspace, only for comparison!
-// These are also 16bit precision coefficients from Rec.601, but with full
-// [0..255] output range.
-static WEBP_INLINE int VP8RGBToY(int r, int g, int b, int rounding) {
- const int luma = 19595 * r + 38470 * g + 7471 * b;
- return (luma + rounding) >> YUV_FIX; // no need to clip
+static WEBP_INLINE int VP8RGBToV(int r, int g, int b) {
+ return VP8ClipUV(+28800 * r - 24116 * g - 4684 * b);
}
-static WEBP_INLINE int VP8_RGB_TO_U(int r, int g, int b, int rounding) {
- const int u = -11058 * r - 21710 * g + 32768 * b;
- return VP8ClipUV(u, rounding);
-}
-
-static WEBP_INLINE int VP8_RGB_TO_V(int r, int g, int b, int rounding) {
- const int v = 32768 * r - 27439 * g - 5329 * b;
- return VP8ClipUV(v, rounding);
-}
-
-#endif // USE_YUVj
-
-#ifdef __cplusplus
+#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 14:38:58 +0000