[WIP] Supporting arm_neon_optional flag for blink platform.

Source/platform/graphics/cpu/arm/WebGLImageConversionNEON.h

-/*
- * Copyright (C) 2012 Gabor Rapcsanyi (rgabor@inf.u-szeged.hu), University of Szeged
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef WebGLImageConversionNEON_h
-#define WebGLImageConversionNEON_h
-
-#if HAVE(ARM_NEON_INTRINSICS)
-
-#include <arm_neon.h>
-
-namespace blink {
-
-namespace SIMD {
-
-ALWAYS_INLINE void unpackOneRowOfRGBA16LittleToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 4;
-    unsigned tailComponents = componentsPerRow % 16;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-    const uint8_t* src = reinterpret_cast<const uint8_t*>(source);
-
-    for (unsigned i = 0; i < componentsSize; i += 16) {
-        uint8x16x2_t components = vld2q_u8(src + i * 2);
-        vst1q_u8(destination + i, components.val[1]);
-    }
-
-    source += componentsSize;
-    destination += componentsSize;
-    pixelsPerRow = tailComponents / 4;
-}
-
-ALWAYS_INLINE void unpackOneRowOfRGB16LittleToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 3;
-    unsigned tailComponents = componentsPerRow % 24;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-
-    uint8x8_t componentA = vdup_n_u8(0xFF);
-    for (unsigned i = 0; i < componentsSize; i += 24) {
-        uint16x8x3_t RGB16 = vld3q_u16(source + i);
-        uint8x8_t componentR = vqmovn_u16(vshrq_n_u16(RGB16.val[0], 8));
-        uint8x8_t componentG = vqmovn_u16(vshrq_n_u16(RGB16.val[1], 8));
-        uint8x8_t componentB = vqmovn_u16(vshrq_n_u16(RGB16.val[2], 8));
-        uint8x8x4_t RGBA8 = {{componentR, componentG, componentB, componentA}};
-        vst4_u8(destination, RGBA8);
-        destination += 32;
-    }
-
-    source += componentsSize;
-    pixelsPerRow = tailComponents / 3;
-}
-
-ALWAYS_INLINE void unpackOneRowOfARGB16LittleToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 4;
-    unsigned tailComponents = componentsPerRow % 32;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-
-    for (unsigned i = 0; i < componentsSize; i += 32) {
-        uint16x8x4_t ARGB16 = vld4q_u16(source + i);
-        uint8x8_t componentA = vqmovn_u16(vshrq_n_u16(ARGB16.val[0], 8));
-        uint8x8_t componentR = vqmovn_u16(vshrq_n_u16(ARGB16.val[1], 8));
-        uint8x8_t componentG = vqmovn_u16(vshrq_n_u16(ARGB16.val[2], 8));
-        uint8x8_t componentB = vqmovn_u16(vshrq_n_u16(ARGB16.val[3], 8));
-        uint8x8x4_t RGBA8 = {{componentR, componentG, componentB, componentA}};
-        vst4_u8(destination + i, RGBA8);
-    }
-
-    source += componentsSize;
-    destination += componentsSize;
-    pixelsPerRow = tailComponents / 4;
-}
-
-ALWAYS_INLINE void unpackOneRowOfBGRA16LittleToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 4;
-    unsigned tailComponents = componentsPerRow % 32;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-
-    for (unsigned i = 0; i < componentsSize; i += 32) {
-        uint16x8x4_t ARGB16 = vld4q_u16(source + i);
-        uint8x8_t componentB = vqmovn_u16(vshrq_n_u16(ARGB16.val[0], 8));
-        uint8x8_t componentG = vqmovn_u16(vshrq_n_u16(ARGB16.val[1], 8));
-        uint8x8_t componentR = vqmovn_u16(vshrq_n_u16(ARGB16.val[2], 8));
-        uint8x8_t componentA = vqmovn_u16(vshrq_n_u16(ARGB16.val[3], 8));
-        uint8x8x4_t RGBA8 = {{componentR, componentG, componentB, componentA}};
-        vst4_u8(destination + i, RGBA8);
-    }
-
-    source += componentsSize;
-    destination += componentsSize;
-    pixelsPerRow = tailComponents / 4;
-}
-
-ALWAYS_INLINE void unpackOneRowOfRGBA4444ToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned tailPixels = pixelsPerRow % 8;
-    unsigned pixelSize = pixelsPerRow - tailPixels;
-
-    uint16x8_t immediate0x0f = vdupq_n_u16(0x0F);
-    for (unsigned i = 0; i < pixelSize; i += 8) {
-        uint16x8_t eightPixels = vld1q_u16(source + i);
-
-        uint8x8_t componentR = vqmovn_u16(vshrq_n_u16(eightPixels, 12));
-        uint8x8_t componentG = vqmovn_u16(vandq_u16(vshrq_n_u16(eightPixels, 8), immediate0x0f));
-        uint8x8_t componentB = vqmovn_u16(vandq_u16(vshrq_n_u16(eightPixels, 4), immediate0x0f));
-        uint8x8_t componentA = vqmovn_u16(vandq_u16(eightPixels, immediate0x0f));
-
-        componentR = vorr_u8(vshl_n_u8(componentR, 4), componentR);
-        componentG = vorr_u8(vshl_n_u8(componentG, 4), componentG);
-        componentB = vorr_u8(vshl_n_u8(componentB, 4), componentB);
-        componentA = vorr_u8(vshl_n_u8(componentA, 4), componentA);
-
-        uint8x8x4_t destComponents = {{componentR, componentG, componentB, componentA}};
-        vst4_u8(destination, destComponents);
-        destination += 32;
-    }
-
-    source += pixelSize;
-    pixelsPerRow = tailPixels;
-}
-
-ALWAYS_INLINE void packOneRowOfRGBA8ToUnsignedShort4444(const uint8_t*& source, uint16_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 4;
-    unsigned tailComponents = componentsPerRow % 32;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-
-    uint8_t* dst = reinterpret_cast<uint8_t*>(destination);
-    uint8x8_t immediate0xf0 = vdup_n_u8(0xF0);
-    for (unsigned i = 0; i < componentsSize; i += 32) {
-        uint8x8x4_t RGBA8 = vld4_u8(source + i);
-
-        uint8x8_t componentR = vand_u8(RGBA8.val[0], immediate0xf0);
-        uint8x8_t componentG = vshr_n_u8(vand_u8(RGBA8.val[1], immediate0xf0), 4);
-        uint8x8_t componentB = vand_u8(RGBA8.val[2], immediate0xf0);
-        uint8x8_t componentA = vshr_n_u8(vand_u8(RGBA8.val[3], immediate0xf0), 4);
-
-        uint8x8x2_t RGBA4;
-        RGBA4.val[0] = vorr_u8(componentB, componentA);
-        RGBA4.val[1] = vorr_u8(componentR, componentG);
-        vst2_u8(dst, RGBA4);
-        dst += 16;
-    }
-
-    source += componentsSize;
-    destination += componentsSize / 4;
-    pixelsPerRow = tailComponents / 4;
-}
-
-ALWAYS_INLINE void unpackOneRowOfRGBA5551ToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned tailPixels = pixelsPerRow % 8;
-    unsigned pixelSize = pixelsPerRow - tailPixels;
-
-    uint8x8_t immediate0x7 = vdup_n_u8(0x7);
-    uint8x8_t immediate0xff = vdup_n_u8(0xFF);
-    uint16x8_t immediate0x1f = vdupq_n_u16(0x1F);
-    uint16x8_t immediate0x1 = vdupq_n_u16(0x1);
-
-    for (unsigned i = 0; i < pixelSize; i += 8) {
-        uint16x8_t eightPixels = vld1q_u16(source + i);
-
-        uint8x8_t componentR = vqmovn_u16(vshrq_n_u16(eightPixels, 11));
-        uint8x8_t componentG = vqmovn_u16(vandq_u16(vshrq_n_u16(eightPixels, 6), immediate0x1f));
-        uint8x8_t componentB = vqmovn_u16(vandq_u16(vshrq_n_u16(eightPixels, 1), immediate0x1f));
-        uint8x8_t componentA = vqmovn_u16(vandq_u16(eightPixels, immediate0x1));
-
-        componentR = vorr_u8(vshl_n_u8(componentR, 3), vand_u8(componentR, immediate0x7));
-        componentG = vorr_u8(vshl_n_u8(componentG, 3), vand_u8(componentG, immediate0x7));
-        componentB = vorr_u8(vshl_n_u8(componentB, 3), vand_u8(componentB, immediate0x7));
-        componentA = vmul_u8(componentA, immediate0xff);
-
-        uint8x8x4_t destComponents = {{componentR, componentG, componentB, componentA}};
-        vst4_u8(destination, destComponents);
-        destination += 32;
-    }
-
-    source += pixelSize;
-    pixelsPerRow = tailPixels;
-}
-
-ALWAYS_INLINE void packOneRowOfRGBA8ToUnsignedShort5551(const uint8_t*& source, uint16_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 4;
-    unsigned tailComponents = componentsPerRow % 32;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-
-    uint8_t* dst = reinterpret_cast<uint8_t*>(destination);
-
-    uint8x8_t immediate0xf8 = vdup_n_u8(0xF8);
-    uint8x8_t immediate0x18 = vdup_n_u8(0x18);
-    for (unsigned i = 0; i < componentsSize; i += 32) {
-        uint8x8x4_t RGBA8 = vld4_u8(source + i);
-
-        uint8x8_t componentR = vand_u8(RGBA8.val[0], immediate0xf8);
-        uint8x8_t componentG3bit = vshr_n_u8(RGBA8.val[1], 5);
-
-        uint8x8_t componentG2bit = vshl_n_u8(vand_u8(RGBA8.val[1], immediate0x18), 3);
-        uint8x8_t componentB = vshr_n_u8(vand_u8(RGBA8.val[2], immediate0xf8), 2);
-        uint8x8_t componentA = vshr_n_u8(RGBA8.val[3], 7);
-
-        uint8x8x2_t RGBA5551;
-        RGBA5551.val[0] = vorr_u8(vorr_u8(componentG2bit, componentB), componentA);
-        RGBA5551.val[1] = vorr_u8(componentR, componentG3bit);
-        vst2_u8(dst, RGBA5551);
-        dst += 16;
-    }
-
-    source += componentsSize;
-    destination += componentsSize / 4;
-    pixelsPerRow = tailComponents / 4;
-}
-
-ALWAYS_INLINE void unpackOneRowOfRGB565ToRGBA8(const uint16_t*& source, uint8_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned tailPixels = pixelsPerRow % 8;
-    unsigned pixelSize = pixelsPerRow - tailPixels;
-
-    uint16x8_t immediate0x3f = vdupq_n_u16(0x3F);
-    uint16x8_t immediate0x1f = vdupq_n_u16(0x1F);
-    uint8x8_t immediate0x3 = vdup_n_u8(0x3);
-    uint8x8_t immediate0x7 = vdup_n_u8(0x7);
-
-    uint8x8_t componentA = vdup_n_u8(0xFF);
-
-    for (unsigned i = 0; i < pixelSize; i += 8) {
-        uint16x8_t eightPixels = vld1q_u16(source + i);
-
-        uint8x8_t componentR = vqmovn_u16(vshrq_n_u16(eightPixels, 11));
-        uint8x8_t componentG = vqmovn_u16(vandq_u16(vshrq_n_u16(eightPixels, 5), immediate0x3f));
-        uint8x8_t componentB = vqmovn_u16(vandq_u16(eightPixels, immediate0x1f));
-
-        componentR = vorr_u8(vshl_n_u8(componentR, 3), vand_u8(componentR, immediate0x7));
-        componentG = vorr_u8(vshl_n_u8(componentG, 2), vand_u8(componentG, immediate0x3));
-        componentB = vorr_u8(vshl_n_u8(componentB, 3), vand_u8(componentB, immediate0x7));
-
-        uint8x8x4_t destComponents = {{componentR, componentG, componentB, componentA}};
-        vst4_u8(destination, destComponents);
-        destination += 32;
-    }
-
-    source += pixelSize;
-    pixelsPerRow = tailPixels;
-}
-
-ALWAYS_INLINE void packOneRowOfRGBA8ToUnsignedShort565(const uint8_t*& source, uint16_t*& destination, unsigned& pixelsPerRow)
-{
-    unsigned componentsPerRow = pixelsPerRow * 4;
-    unsigned tailComponents = componentsPerRow % 32;
-    unsigned componentsSize = componentsPerRow - tailComponents;
-    uint8_t* dst = reinterpret_cast<uint8_t*>(destination);
-
-    uint8x8_t immediate0xf8 = vdup_n_u8(0xF8);
-    uint8x8_t immediate0x1c = vdup_n_u8(0x1C);
-    for (unsigned i = 0; i < componentsSize; i += 32) {
-        uint8x8x4_t RGBA8 = vld4_u8(source + i);
-
-        uint8x8_t componentR = vand_u8(RGBA8.val[0], immediate0xf8);
-        uint8x8_t componentGLeft = vshr_n_u8(RGBA8.val[1], 5);
-        uint8x8_t componentGRight = vshl_n_u8(vand_u8(RGBA8.val[1], immediate0x1c), 3);
-        uint8x8_t componentB = vshr_n_u8(vand_u8(RGBA8.val[2], immediate0xf8), 3);
-
-        uint8x8x2_t RGB565;
-        RGB565.val[0] = vorr_u8(componentGRight, componentB);
-        RGB565.val[1] = vorr_u8(componentR, componentGLeft);
-        vst2_u8(dst, RGB565);
-        dst += 16;
-    }
-
-    source += componentsSize;
-    destination += componentsSize / 4;
-    pixelsPerRow = tailComponents / 4;
-}
-
-} // namespace SIMD
-
-} // namespace blink
-
-#endif // HAVE(ARM_NEON_INTRINSICS)
-
-#endif // WebGLImageConversionNEON_h