text: #ifndef SkColor_opts_neon_DEFINED
  #define SkColor_opts_neon_DEFINED
  
  #include "SkTypes.h"
  
  #include <arm_neon.h>
  
  #define NEON_A (SK_A32_SHIFT / 8)
  #define NEON_R (SK_R32_SHIFT / 8)
  #define NEON_G (SK_G32_SHIFT / 8)
  #define NEON_B (SK_B32_SHIFT / 8)
  
  static inline uint16x8_t SkAlpha255To256_neon8(uint8x8_t alpha) {
      return vaddw_u8(vdupq_n_u16(1), alpha);
  }
  
  static inline uint8x8_t SkAlphaMul_neon8(uint8x8_t color, uint16x8_t scale) {
      return vshrn_n_u16(vmovl_u8(color) * scale, 8);
  }
  
  static inline uint8x8x4_t SkAlphaMulQ_neon8(uint8x8x4_t color, uint16x8_t scale) {
      uint8x8x4_t ret;
  
      ret.val[NEON_A] = SkAlphaMul_neon8(color.val[NEON_A], scale);
      ret.val[NEON_R] = SkAlphaMul_neon8(color.val[NEON_R], scale);
      ret.val[NEON_G] = SkAlphaMul_neon8(color.val[NEON_G], scale);
      ret.val[NEON_B] = SkAlphaMul_neon8(color.val[NEON_B], scale);
  
      return ret;
  }
  /* This function expands 8 pixels from RGB565 (R, G, B from high to low) to
   * SkPMColor (all possible configurations supported) in the exact same way as
   * SkPixel16ToPixel32.
   */
  static inline uint8x8x4_t SkPixel16ToPixel32_neon8(uint16x8_t vsrc) {
  
      uint8x8x4_t ret;
      uint8x8_t vr, vg, vb;
  
      vr = vmovn_u16(vshrq_n_u16(vsrc, SK_R16_SHIFT));
      vg = vmovn_u16(vshrq_n_u16(vshlq_n_u16(vsrc, SK_R16_BITS), SK_R16_BITS + SK_B16_BITS));
      vb = vmovn_u16(vsrc & vdupq_n_u16(SK_B16_MASK));
  
      ret.val[NEON_A] = vdup_n_u8(0xFF);
      ret.val[NEON_R] = vshl_n_u8(vr, 8 - SK_R16_BITS) | vshr_n_u8(vr, 2 * SK_R16_BITS - 8);
      ret.val[NEON_G] = vshl_n_u8(vg, 8 - SK_G16_BITS) | vshr_n_u8(vg, 2 * SK_G16_BITS - 8);
      ret.val[NEON_B] = vshl_n_u8(vb, 8 - SK_B16_BITS) | vshr_n_u8(vb, 2 * SK_B16_BITS - 8);
  
      return ret;
  }
  
  /* This function packs 8 pixels from SkPMColor (all possible configurations
   * supported) to RGB565 (R, G, B from high to low) in the exact same way as
   * SkPixel32ToPixel16.
   */
  static inline uint16x8_t SkPixel32ToPixel16_neon8(uint8x8x4_t vsrc) {
  
      uint16x8_t ret;
  
      ret = vshll_n_u8(vsrc.val[NEON_R], 8);
      ret = vsriq_n_u16(ret, vshll_n_u8(vsrc.val[NEON_G], 8), SK_R16_BITS);
      ret = vsriq_n_u16(ret, vshll_n_u8(vsrc.val[NEON_B], 8), SK_R16_BITS + SK_G16_BITS);
  
      return ret;
  }
  
  #endif /* #ifndef SkColor_opts_neon_DEFINED */
  