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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkColor_opts_neon_DEFINED
#define SkColor_opts_neon_DEFINED
#include "SkTypes.h"
#include "SkColorData.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;
}
/* This function blends 8 pixels of the same channel in the exact same way as
* SkBlend32.
*/
static inline uint8x8_t SkBlend32_neon8(uint8x8_t src, uint8x8_t dst, uint16x8_t scale) {
int16x8_t src_wide, dst_wide;
src_wide = vreinterpretq_s16_u16(vmovl_u8(src));
dst_wide = vreinterpretq_s16_u16(vmovl_u8(dst));
src_wide = (src_wide - dst_wide) * vreinterpretq_s16_u16(scale);
dst_wide += vshrq_n_s16(src_wide, 5);
return vmovn_u16(vreinterpretq_u16_s16(dst_wide));
}
static inline SkPMColor SkFourByteInterp256_neon(SkPMColor src, SkPMColor dst,
unsigned srcScale) {
SkASSERT(srcScale <= 256);
int16x8_t vscale = vdupq_n_s16(srcScale);
int16x8_t vsrc_wide, vdst_wide, vdiff;
uint8x8_t res;
vsrc_wide = vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(vdup_n_u32(src))));
vdst_wide = vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(vdup_n_u32(dst))));
vdiff = vsrc_wide - vdst_wide;
vdiff *= vscale;
vdiff = vshrq_n_s16(vdiff, 8);
vdst_wide += vdiff;
res = vmovn_u16(vreinterpretq_u16_s16(vdst_wide));
return vget_lane_u32(vreinterpret_u32_u8(res), 0);
}
static inline SkPMColor SkFourByteInterp_neon(SkPMColor src, SkPMColor dst,
U8CPU srcWeight) {
SkASSERT(srcWeight <= 255);
unsigned scale = SkAlpha255To256(srcWeight);
return SkFourByteInterp256_neon(src, dst, scale);
}
#endif /* #ifndef SkColor_opts_neon_DEFINED */
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