From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- gfx/ycbcr/yuv_row_c.cpp | 133 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 133 insertions(+) create mode 100644 gfx/ycbcr/yuv_row_c.cpp (limited to 'gfx/ycbcr/yuv_row_c.cpp') diff --git a/gfx/ycbcr/yuv_row_c.cpp b/gfx/ycbcr/yuv_row_c.cpp new file mode 100644 index 0000000000..b986451ec2 --- /dev/null +++ b/gfx/ycbcr/yuv_row_c.cpp @@ -0,0 +1,133 @@ +// Copyright (c) 2010 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "yuv_row.h" + +#define DCHECK(a) + +extern "C" { + +// C reference code that mimic the YUV assembly. +#define packuswb(x) ((x) < 0 ? 0 : ((x) > 255 ? 255 : (x))) +#define paddsw(x, y) (((x) + (y)) < -32768 ? -32768 : \ + (((x) + (y)) > 32767 ? 32767 : ((x) + (y)))) + +static inline void YuvPixel(uint8_t y, + uint8_t u, + uint8_t v, + uint8_t* rgb_buf) { + + int b = kCoefficientsRgbY[256+u][0]; + int g = kCoefficientsRgbY[256+u][1]; + int r = kCoefficientsRgbY[256+u][2]; + int a = kCoefficientsRgbY[256+u][3]; + + b = paddsw(b, kCoefficientsRgbY[512+v][0]); + g = paddsw(g, kCoefficientsRgbY[512+v][1]); + r = paddsw(r, kCoefficientsRgbY[512+v][2]); + a = paddsw(a, kCoefficientsRgbY[512+v][3]); + + b = paddsw(b, kCoefficientsRgbY[y][0]); + g = paddsw(g, kCoefficientsRgbY[y][1]); + r = paddsw(r, kCoefficientsRgbY[y][2]); + a = paddsw(a, kCoefficientsRgbY[y][3]); + + b >>= 6; + g >>= 6; + r >>= 6; + a >>= 6; + + *reinterpret_cast(rgb_buf) = (packuswb(b)) | + (packuswb(g) << 8) | + (packuswb(r) << 16) | + (packuswb(a) << 24); +} + +void FastConvertYUVToRGB32Row_C(const uint8_t* y_buf, + const uint8_t* u_buf, + const uint8_t* v_buf, + uint8_t* rgb_buf, + int width, + unsigned int x_shift) { + for (int x = 0; x < width; x += 2) { + uint8_t u = u_buf[x >> x_shift]; + uint8_t v = v_buf[x >> x_shift]; + uint8_t y0 = y_buf[x]; + YuvPixel(y0, u, v, rgb_buf); + if ((x + 1) < width) { + uint8_t y1 = y_buf[x + 1]; + if (x_shift == 0) { + u = u_buf[x + 1]; + v = v_buf[x + 1]; + } + YuvPixel(y1, u, v, rgb_buf + 4); + } + rgb_buf += 8; // Advance 2 pixels. + } +} + +// 16.16 fixed point is used. A shift by 16 isolates the integer. +// A shift by 17 is used to further subsample the chrominence channels. +// & 0xffff isolates the fixed point fraction. >> 2 to get the upper 2 bits, +// for 1/65536 pixel accurate interpolation. +void ScaleYUVToRGB32Row_C(const uint8_t* y_buf, + const uint8_t* u_buf, + const uint8_t* v_buf, + uint8_t* rgb_buf, + int width, + int source_dx) { + int x = 0; + for (int i = 0; i < width; i += 2) { + int y = y_buf[x >> 16]; + int u = u_buf[(x >> 17)]; + int v = v_buf[(x >> 17)]; + YuvPixel(y, u, v, rgb_buf); + x += source_dx; + if ((i + 1) < width) { + y = y_buf[x >> 16]; + YuvPixel(y, u, v, rgb_buf+4); + x += source_dx; + } + rgb_buf += 8; + } +} + +void LinearScaleYUVToRGB32Row_C(const uint8_t* y_buf, + const uint8_t* u_buf, + const uint8_t* v_buf, + uint8_t* rgb_buf, + int width, + int source_dx) { + int x = 0; + if (source_dx >= 0x20000) { + x = 32768; + } + for (int i = 0; i < width; i += 2) { + int y0 = y_buf[x >> 16]; + int y1 = y_buf[(x >> 16) + 1]; + int u0 = u_buf[(x >> 17)]; + int u1 = u_buf[(x >> 17) + 1]; + int v0 = v_buf[(x >> 17)]; + int v1 = v_buf[(x >> 17) + 1]; + int y_frac = (x & 65535); + int uv_frac = ((x >> 1) & 65535); + int y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16; + int u = (uv_frac * u1 + (uv_frac ^ 65535) * u0) >> 16; + int v = (uv_frac * v1 + (uv_frac ^ 65535) * v0) >> 16; + YuvPixel(y, u, v, rgb_buf); + x += source_dx; + if ((i + 1) < width) { + y0 = y_buf[x >> 16]; + y1 = y_buf[(x >> 16) + 1]; + y_frac = (x & 65535); + y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16; + YuvPixel(y, u, v, rgb_buf+4); + x += source_dx; + } + rgb_buf += 8; + } +} + +} // extern "C" + -- cgit v1.2.3