зеркало из https://github.com/mozilla/gecko-dev.git
90 строки
3.2 KiB
C++
90 строки
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <arm_neon.h>
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#include "LuminanceNEON.h"
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using namespace mozilla::gfx;
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/**
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* Byte offsets of channels in a native packed gfxColor or cairo image surface.
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*/
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#ifdef IS_BIG_ENDIAN
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#define GFX_ARGB32_OFFSET_A 0
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#define GFX_ARGB32_OFFSET_R 1
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#define GFX_ARGB32_OFFSET_G 2
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#define GFX_ARGB32_OFFSET_B 3
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#else
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#define GFX_ARGB32_OFFSET_A 3
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#define GFX_ARGB32_OFFSET_R 2
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#define GFX_ARGB32_OFFSET_G 1
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#define GFX_ARGB32_OFFSET_B 0
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#endif
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void
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ComputesRGBLuminanceMask_NEON(const uint8_t *aSourceData,
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int32_t aSourceStride,
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uint8_t *aDestData,
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int32_t aDestStride,
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const IntSize &aSize,
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float aOpacity)
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{
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int32_t redFactor = 55 * aOpacity; // 255 * 0.2125 * opacity
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int32_t greenFactor = 183 * aOpacity; // 255 * 0.7154 * opacity
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int32_t blueFactor = 18 * aOpacity; // 255 * 0.0721
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const uint8_t *sourcePixel = aSourceData;
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int32_t sourceOffset = aSourceStride - 4 * aSize.width;
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uint8_t *destPixel = aDestData;
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int32_t destOffset = aDestStride - aSize.width;
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sourcePixel = aSourceData;
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int32_t remainderWidth = aSize.width % 8;
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int32_t roundedWidth = aSize.width - remainderWidth;
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uint16x8_t temp;
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uint8x8_t gray;
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uint8x8_t redVector = vdup_n_u8(redFactor);
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uint8x8_t greenVector = vdup_n_u8(greenFactor);
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uint8x8_t blueVector = vdup_n_u8(blueFactor);
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uint8x8_t fullBitVector = vdup_n_u8(255);
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uint8x8_t oneVector = vdup_n_u8(1);
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for (int32_t y = 0; y < aSize.height; y++) {
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// Calculate luminance by neon with 8 pixels per loop
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for (int32_t x = 0; x < roundedWidth; x += 8) {
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uint8x8x4_t argb = vld4_u8(sourcePixel);
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temp = vmull_u8(argb.val[GFX_ARGB32_OFFSET_R], redVector); // temp = red * redFactor
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temp = vmlal_u8(temp, argb.val[GFX_ARGB32_OFFSET_G], greenVector); // temp += green * greenFactor
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temp = vmlal_u8(temp, argb.val[GFX_ARGB32_OFFSET_B], blueVector); // temp += blue * blueFactor
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gray = vshrn_n_u16(temp, 8); // gray = temp >> 8
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// Check alpha value
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uint8x8_t alphaVector = vtst_u8(argb.val[GFX_ARGB32_OFFSET_A], fullBitVector);
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gray = vmul_u8(gray, vand_u8(alphaVector, oneVector));
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// Put the result to the 8 pixels
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vst1_u8(destPixel, gray);
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sourcePixel += 8 * 4;
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destPixel += 8;
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}
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// Calculate the rest pixels of the line by cpu
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for (int32_t x = 0; x < remainderWidth; x++) {
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if (sourcePixel[GFX_ARGB32_OFFSET_A] > 0) {
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*destPixel = (redFactor * sourcePixel[GFX_ARGB32_OFFSET_R]+
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greenFactor * sourcePixel[GFX_ARGB32_OFFSET_G] +
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blueFactor * sourcePixel[GFX_ARGB32_OFFSET_B]) >> 8;
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} else {
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*destPixel = 0;
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}
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sourcePixel += 4;
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destPixel++;
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}
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sourcePixel += sourceOffset;
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destPixel += destOffset;
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}
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}
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