/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBlitMask_opts_DEFINED
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#define SkBlitMask_opts_DEFINED
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#include "Sk4px.h"
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namespace SK_OPTS_NS {
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#if defined(SK_ARM_HAS_NEON)
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// The Sk4px versions below will work fine with NEON, but we have had many indications
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// that it doesn't perform as well as this NEON-specific code. TODO(mtklein): why?
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#define NEON_A (SK_A32_SHIFT / 8)
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#define NEON_R (SK_R32_SHIFT / 8)
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#define NEON_G (SK_G32_SHIFT / 8)
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#define NEON_B (SK_B32_SHIFT / 8)
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static inline uint16x8_t SkAlpha255To256_neon8(uint8x8_t alpha) {
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return vaddw_u8(vdupq_n_u16(1), alpha);
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}
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static inline uint8x8_t SkAlphaMul_neon8(uint8x8_t color, uint16x8_t scale) {
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return vshrn_n_u16(vmovl_u8(color) * scale, 8);
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}
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static inline uint8x8x4_t SkAlphaMulQ_neon8(uint8x8x4_t color, uint16x8_t scale) {
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uint8x8x4_t ret;
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ret.val[0] = SkAlphaMul_neon8(color.val[0], scale);
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ret.val[1] = SkAlphaMul_neon8(color.val[1], scale);
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ret.val[2] = SkAlphaMul_neon8(color.val[2], scale);
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ret.val[3] = SkAlphaMul_neon8(color.val[3], scale);
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return ret;
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}
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template <bool isColor>
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static void D32_A8_Opaque_Color_neon(void* SK_RESTRICT dst, size_t dstRB,
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const void* SK_RESTRICT maskPtr, size_t maskRB,
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SkColor color, int width, int height) {
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SkPMColor pmc = SkPreMultiplyColor(color);
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SkPMColor* SK_RESTRICT device = (SkPMColor*)dst;
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const uint8_t* SK_RESTRICT mask = (const uint8_t*)maskPtr;
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uint8x8x4_t vpmc;
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maskRB -= width;
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dstRB -= (width << 2);
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if (width >= 8) {
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vpmc.val[NEON_A] = vdup_n_u8(SkGetPackedA32(pmc));
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vpmc.val[NEON_R] = vdup_n_u8(SkGetPackedR32(pmc));
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vpmc.val[NEON_G] = vdup_n_u8(SkGetPackedG32(pmc));
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vpmc.val[NEON_B] = vdup_n_u8(SkGetPackedB32(pmc));
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}
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do {
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int w = width;
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while (w >= 8) {
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uint8x8_t vmask = vld1_u8(mask);
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uint16x8_t vscale, vmask256 = SkAlpha255To256_neon8(vmask);
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if (isColor) {
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vscale = vsubw_u8(vdupq_n_u16(256),
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SkAlphaMul_neon8(vpmc.val[NEON_A], vmask256));
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} else {
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vscale = vsubw_u8(vdupq_n_u16(256), vmask);
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}
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uint8x8x4_t vdev = vld4_u8((uint8_t*)device);
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vdev.val[NEON_A] = SkAlphaMul_neon8(vpmc.val[NEON_A], vmask256)
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+ SkAlphaMul_neon8(vdev.val[NEON_A], vscale);
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vdev.val[NEON_R] = SkAlphaMul_neon8(vpmc.val[NEON_R], vmask256)
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+ SkAlphaMul_neon8(vdev.val[NEON_R], vscale);
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vdev.val[NEON_G] = SkAlphaMul_neon8(vpmc.val[NEON_G], vmask256)
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+ SkAlphaMul_neon8(vdev.val[NEON_G], vscale);
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vdev.val[NEON_B] = SkAlphaMul_neon8(vpmc.val[NEON_B], vmask256)
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+ SkAlphaMul_neon8(vdev.val[NEON_B], vscale);
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vst4_u8((uint8_t*)device, vdev);
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mask += 8;
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device += 8;
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w -= 8;
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}
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while (w--) {
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unsigned aa = *mask++;
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if (isColor) {
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*device = SkBlendARGB32(pmc, *device, aa);
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} else {
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*device = SkAlphaMulQ(pmc, SkAlpha255To256(aa))
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+ SkAlphaMulQ(*device, SkAlpha255To256(255 - aa));
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}
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device += 1;
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};
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device = (uint32_t*)((char*)device + dstRB);
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mask += maskRB;
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} while (--height != 0);
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}
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static void blit_mask_d32_a8_general(SkPMColor* dst, size_t dstRB,
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const SkAlpha* mask, size_t maskRB,
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SkColor color, int w, int h) {
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D32_A8_Opaque_Color_neon<true>(dst, dstRB, mask, maskRB, color, w, h);
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}
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// As above, but made slightly simpler by requiring that color is opaque.
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static void blit_mask_d32_a8_opaque(SkPMColor* dst, size_t dstRB,
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const SkAlpha* mask, size_t maskRB,
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SkColor color, int w, int h) {
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D32_A8_Opaque_Color_neon<false>(dst, dstRB, mask, maskRB, color, w, h);
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}
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// Same as _opaque, but assumes color == SK_ColorBLACK, a very common and even simpler case.
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static void blit_mask_d32_a8_black(SkPMColor* dst, size_t dstRB,
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const SkAlpha* maskPtr, size_t maskRB,
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int width, int height) {
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SkPMColor* SK_RESTRICT device = (SkPMColor*)dst;
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const uint8_t* SK_RESTRICT mask = (const uint8_t*)maskPtr;
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maskRB -= width;
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dstRB -= (width << 2);
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do {
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int w = width;
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while (w >= 8) {
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uint8x8_t vmask = vld1_u8(mask);
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uint16x8_t vscale = vsubw_u8(vdupq_n_u16(256), vmask);
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uint8x8x4_t vdevice = vld4_u8((uint8_t*)device);
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vdevice = SkAlphaMulQ_neon8(vdevice, vscale);
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vdevice.val[NEON_A] += vmask;
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vst4_u8((uint8_t*)device, vdevice);
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mask += 8;
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device += 8;
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w -= 8;
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}
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while (w-- > 0) {
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unsigned aa = *mask++;
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*device = (aa << SK_A32_SHIFT)
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+ SkAlphaMulQ(*device, SkAlpha255To256(255 - aa));
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device += 1;
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};
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device = (uint32_t*)((char*)device + dstRB);
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mask += maskRB;
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} while (--height != 0);
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}
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#else
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static void blit_mask_d32_a8_general(SkPMColor* dst, size_t dstRB,
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const SkAlpha* mask, size_t maskRB,
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SkColor color, int w, int h) {
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auto s = Sk4px::DupPMColor(SkPreMultiplyColor(color));
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auto fn = [&](const Sk4px& d, const Sk4px& aa) {
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// = (s + d(1-sa))aa + d(1-aa)
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// = s*aa + d(1-sa*aa)
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auto left = s.approxMulDiv255(aa),
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right = d.approxMulDiv255(left.alphas().inv());
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return left + right; // This does not overflow (exhaustively checked).
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};
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while (h --> 0) {
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Sk4px::MapDstAlpha(w, dst, mask, fn);
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dst += dstRB / sizeof(*dst);
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mask += maskRB / sizeof(*mask);
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}
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}
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// As above, but made slightly simpler by requiring that color is opaque.
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static void blit_mask_d32_a8_opaque(SkPMColor* dst, size_t dstRB,
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const SkAlpha* mask, size_t maskRB,
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SkColor color, int w, int h) {
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SkASSERT(SkColorGetA(color) == 0xFF);
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auto s = Sk4px::DupPMColor(SkPreMultiplyColor(color));
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auto fn = [&](const Sk4px& d, const Sk4px& aa) {
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// = (s + d(1-sa))aa + d(1-aa)
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// = s*aa + d(1-sa*aa)
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// ~~~>
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// = s*aa + d(1-aa)
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return s.approxMulDiv255(aa) + d.approxMulDiv255(aa.inv());
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};
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while (h --> 0) {
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Sk4px::MapDstAlpha(w, dst, mask, fn);
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dst += dstRB / sizeof(*dst);
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mask += maskRB / sizeof(*mask);
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}
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}
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// Same as _opaque, but assumes color == SK_ColorBLACK, a very common and even simpler case.
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static void blit_mask_d32_a8_black(SkPMColor* dst, size_t dstRB,
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const SkAlpha* mask, size_t maskRB,
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int w, int h) {
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auto fn = [](const Sk4px& d, const Sk4px& aa) {
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// = (s + d(1-sa))aa + d(1-aa)
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// = s*aa + d(1-sa*aa)
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// ~~~>
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// a = 1*aa + d(1-1*aa) = aa + d(1-aa)
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// c = 0*aa + d(1-1*aa) = d(1-aa)
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return Sk4px(Sk16b(aa) & Sk16b(0,0,0,255, 0,0,0,255, 0,0,0,255, 0,0,0,255))
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+ d.approxMulDiv255(aa.inv());
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};
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while (h --> 0) {
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Sk4px::MapDstAlpha(w, dst, mask, fn);
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dst += dstRB / sizeof(*dst);
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mask += maskRB / sizeof(*mask);
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}
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}
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#endif
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/*not static*/ inline void blit_mask_d32_a8(SkPMColor* dst, size_t dstRB,
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const SkAlpha* mask, size_t maskRB,
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SkColor color, int w, int h) {
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if (color == SK_ColorBLACK) {
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blit_mask_d32_a8_black(dst, dstRB, mask, maskRB, w, h);
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} else if (SkColorGetA(color) == 0xFF) {
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blit_mask_d32_a8_opaque(dst, dstRB, mask, maskRB, color, w, h);
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} else {
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blit_mask_d32_a8_general(dst, dstRB, mask, maskRB, color, w, h);
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}
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}
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} // SK_OPTS_NS
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#endif//SkBlitMask_opts_DEFINED
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