Added Loseless mode, fix SRGB eotf, fix alpha encoding, fix 100% quality

Author: awxkee

avif-coder/src/main/cpp/algo/fast_math-inl.h

@@ -89,7 +89,7 @@ Exp2f(const DF df, V x) {
 }
 
 template<class D, HWY_IF_U16_D(D)>
-HWY_INLINE Vec<D> DivBy255(D d, Vec<D> x) {
+HWY_FAST_MATH_INLINE Vec<D> DivBy255(D d, Vec<D> x) {
   const auto rounding = Set(d, 1 << 7);
   x = Add(x, rounding);
   const auto multiplier = Set(d, 0x8080);

avif-coder/src/main/cpp/imagebits/RGBAlpha.cpp

@@ -74,7 +74,7 @@ RearrangeVecAlpha(Vec<FixedTag<uint16_t, 8>> vec, Vec<FixedTag<uint16_t, 8>> alp
 void UnpremultiplyRGBA_HWY(const uint8_t *src, int srcStride,
                            uint8_t *dst, int dstStride, int width,
                            int height) {
-  concurrency::parallel_for(2, height, [&](int y) {
+  for (uint32_t y = 0; y < height; ++y) {
     const FixedTag<uint8_t, 16> du8x16;
     const FixedTag<uint16_t, 8> du16x8;
     const FixedTag<uint8_t, 8> du8x8;
@@ -147,7 +147,7 @@ void UnpremultiplyRGBA_HWY(const uint8_t *src, int srcStride,
       mSrc += 4;
       mDst += 4;
     }
-  });
+  }
 }
 
 void PremultiplyRGBA_HWY(const uint8_t *src, int srcStride,

avif-coder/src/main/cpp/imagebits/Rgb1010102.cpp

@@ -310,8 +310,8 @@ Rgba8ToRGBA1010102HWYRow(const uint8_t *HWY_RESTRICT data, uint32_t *HWY_RESTRIC
 
     if (attenuateAlpha) {
       r = (static_cast<uint16_t>(r) * static_cast<uint16_t>(alpha)) / static_cast<uint16_t >(255);
-      g = (static_cast<uint16_t>(r) * static_cast<uint16_t>(alpha)) / static_cast<uint16_t >(255);
-      b = (static_cast<uint16_t>(r) * static_cast<uint16_t>(alpha)) / static_cast<uint16_t >(255);
+      g = (static_cast<uint16_t>(g) * static_cast<uint16_t>(alpha)) / static_cast<uint16_t >(255);
+      b = (static_cast<uint16_t>(b) * static_cast<uint16_t>(alpha)) / static_cast<uint16_t >(255);
     }
 
     auto A16 = ((uint32_t) alpha * 3 + 127) >> 8;