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-rw-r--r--gfx/skia/skia/src/opts/SkBlitMask_opts.h238
1 files changed, 238 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/opts/SkBlitMask_opts.h b/gfx/skia/skia/src/opts/SkBlitMask_opts.h
new file mode 100644
index 0000000000..8e673a9728
--- /dev/null
+++ b/gfx/skia/skia/src/opts/SkBlitMask_opts.h
@@ -0,0 +1,238 @@
+/*
+ * 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 SkBlitMask_opts_DEFINED
+#define SkBlitMask_opts_DEFINED
+
+#include "include/private/base/SkFeatures.h"
+#include "src/core/Sk4px.h"
+
+#if defined(SK_ARM_HAS_NEON)
+ #include <arm_neon.h>
+#endif
+
+namespace SK_OPTS_NS {
+
+#if defined(SK_ARM_HAS_NEON)
+ // The Sk4px versions below will work fine with NEON, but we have had many indications
+ // that it doesn't perform as well as this NEON-specific code. TODO(mtklein): why?
+
+ #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[0] = SkAlphaMul_neon8(color.val[0], scale);
+ ret.val[1] = SkAlphaMul_neon8(color.val[1], scale);
+ ret.val[2] = SkAlphaMul_neon8(color.val[2], scale);
+ ret.val[3] = SkAlphaMul_neon8(color.val[3], scale);
+
+ return ret;
+ }
+
+
+ template <bool isColor>
+ static void D32_A8_Opaque_Color_neon(void* SK_RESTRICT dst, size_t dstRB,
+ const void* SK_RESTRICT maskPtr, size_t maskRB,
+ SkColor color, int width, int height) {
+ SkPMColor pmc = SkPreMultiplyColor(color);
+ SkPMColor* SK_RESTRICT device = (SkPMColor*)dst;
+ const uint8_t* SK_RESTRICT mask = (const uint8_t*)maskPtr;
+ uint8x8x4_t vpmc;
+
+ // Nine patch may set maskRB to 0 to blit the same row repeatedly.
+ ptrdiff_t mask_adjust = (ptrdiff_t)maskRB - width;
+ dstRB -= (width << 2);
+
+ if (width >= 8) {
+ vpmc.val[NEON_A] = vdup_n_u8(SkGetPackedA32(pmc));
+ vpmc.val[NEON_R] = vdup_n_u8(SkGetPackedR32(pmc));
+ vpmc.val[NEON_G] = vdup_n_u8(SkGetPackedG32(pmc));
+ vpmc.val[NEON_B] = vdup_n_u8(SkGetPackedB32(pmc));
+ }
+ do {
+ int w = width;
+ while (w >= 8) {
+ uint8x8_t vmask = vld1_u8(mask);
+ uint16x8_t vscale, vmask256 = SkAlpha255To256_neon8(vmask);
+ if (isColor) {
+ vscale = vsubw_u8(vdupq_n_u16(256),
+ SkAlphaMul_neon8(vpmc.val[NEON_A], vmask256));
+ } else {
+ vscale = vsubw_u8(vdupq_n_u16(256), vmask);
+ }
+ uint8x8x4_t vdev = vld4_u8((uint8_t*)device);
+
+ vdev.val[NEON_A] = SkAlphaMul_neon8(vpmc.val[NEON_A], vmask256)
+ + SkAlphaMul_neon8(vdev.val[NEON_A], vscale);
+ vdev.val[NEON_R] = SkAlphaMul_neon8(vpmc.val[NEON_R], vmask256)
+ + SkAlphaMul_neon8(vdev.val[NEON_R], vscale);
+ vdev.val[NEON_G] = SkAlphaMul_neon8(vpmc.val[NEON_G], vmask256)
+ + SkAlphaMul_neon8(vdev.val[NEON_G], vscale);
+ vdev.val[NEON_B] = SkAlphaMul_neon8(vpmc.val[NEON_B], vmask256)
+ + SkAlphaMul_neon8(vdev.val[NEON_B], vscale);
+
+ vst4_u8((uint8_t*)device, vdev);
+
+ mask += 8;
+ device += 8;
+ w -= 8;
+ }
+
+ while (w--) {
+ unsigned aa = *mask++;
+ if (isColor) {
+ *device = SkBlendARGB32(pmc, *device, aa);
+ } else {
+ *device = SkAlphaMulQ(pmc, SkAlpha255To256(aa))
+ + SkAlphaMulQ(*device, SkAlpha255To256(255 - aa));
+ }
+ device += 1;
+ }
+
+ device = (uint32_t*)((char*)device + dstRB);
+ mask += mask_adjust;
+
+ } while (--height != 0);
+ }
+
+ static void blit_mask_d32_a8_general(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* mask, size_t maskRB,
+ SkColor color, int w, int h) {
+ D32_A8_Opaque_Color_neon<true>(dst, dstRB, mask, maskRB, color, w, h);
+ }
+
+ // As above, but made slightly simpler by requiring that color is opaque.
+ static void blit_mask_d32_a8_opaque(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* mask, size_t maskRB,
+ SkColor color, int w, int h) {
+ D32_A8_Opaque_Color_neon<false>(dst, dstRB, mask, maskRB, color, w, h);
+ }
+
+ // Same as _opaque, but assumes color == SK_ColorBLACK, a very common and even simpler case.
+ static void blit_mask_d32_a8_black(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* maskPtr, size_t maskRB,
+ int width, int height) {
+ SkPMColor* SK_RESTRICT device = (SkPMColor*)dst;
+ const uint8_t* SK_RESTRICT mask = (const uint8_t*)maskPtr;
+
+ // Nine patch may set maskRB to 0 to blit the same row repeatedly.
+ ptrdiff_t mask_adjust = (ptrdiff_t)maskRB - width;
+ dstRB -= (width << 2);
+ do {
+ int w = width;
+ while (w >= 8) {
+ uint8x8_t vmask = vld1_u8(mask);
+ uint16x8_t vscale = vsubw_u8(vdupq_n_u16(256), vmask);
+ uint8x8x4_t vdevice = vld4_u8((uint8_t*)device);
+
+ vdevice = SkAlphaMulQ_neon8(vdevice, vscale);
+ vdevice.val[NEON_A] += vmask;
+
+ vst4_u8((uint8_t*)device, vdevice);
+
+ mask += 8;
+ device += 8;
+ w -= 8;
+ }
+ while (w-- > 0) {
+ unsigned aa = *mask++;
+ *device = (aa << SK_A32_SHIFT)
+ + SkAlphaMulQ(*device, SkAlpha255To256(255 - aa));
+ device += 1;
+ }
+ device = (uint32_t*)((char*)device + dstRB);
+ mask += mask_adjust;
+ } while (--height != 0);
+ }
+
+#else
+ static void blit_mask_d32_a8_general(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* mask, size_t maskRB,
+ SkColor color, int w, int h) {
+ auto s = Sk4px::DupPMColor(SkPreMultiplyColor(color));
+ auto fn = [&](const Sk4px& d, const Sk4px& aa) {
+ // = (s + d(1-sa))aa + d(1-aa)
+ // = s*aa + d(1-sa*aa)
+ auto left = s.approxMulDiv255(aa),
+ right = d.approxMulDiv255(left.alphas().inv());
+ return left + right; // This does not overflow (exhaustively checked).
+ };
+ while (h --> 0) {
+ Sk4px::MapDstAlpha(w, dst, mask, fn);
+ dst += dstRB / sizeof(*dst);
+ mask += maskRB / sizeof(*mask);
+ }
+ }
+
+ // As above, but made slightly simpler by requiring that color is opaque.
+ static void blit_mask_d32_a8_opaque(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* mask, size_t maskRB,
+ SkColor color, int w, int h) {
+ SkASSERT(SkColorGetA(color) == 0xFF);
+ auto s = Sk4px::DupPMColor(SkPreMultiplyColor(color));
+ auto fn = [&](const Sk4px& d, const Sk4px& aa) {
+ // = (s + d(1-sa))aa + d(1-aa)
+ // = s*aa + d(1-sa*aa)
+ // ~~~>
+ // = s*aa + d(1-aa)
+ return s.approxMulDiv255(aa) + d.approxMulDiv255(aa.inv());
+ };
+ while (h --> 0) {
+ Sk4px::MapDstAlpha(w, dst, mask, fn);
+ dst += dstRB / sizeof(*dst);
+ mask += maskRB / sizeof(*mask);
+ }
+ }
+
+ // Same as _opaque, but assumes color == SK_ColorBLACK, a very common and even simpler case.
+ static void blit_mask_d32_a8_black(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* mask, size_t maskRB,
+ int w, int h) {
+ auto fn = [](const Sk4px& d, const Sk4px& aa) {
+ // = (s + d(1-sa))aa + d(1-aa)
+ // = s*aa + d(1-sa*aa)
+ // ~~~>
+ // a = 1*aa + d(1-1*aa) = aa + d(1-aa)
+ // c = 0*aa + d(1-1*aa) = d(1-aa)
+ return (aa & Sk4px(skvx::byte16{0,0,0,255, 0,0,0,255, 0,0,0,255, 0,0,0,255}))
+ + d.approxMulDiv255(aa.inv());
+ };
+ while (h --> 0) {
+ Sk4px::MapDstAlpha(w, dst, mask, fn);
+ dst += dstRB / sizeof(*dst);
+ mask += maskRB / sizeof(*mask);
+ }
+ }
+#endif
+
+/*not static*/ inline void blit_mask_d32_a8(SkPMColor* dst, size_t dstRB,
+ const SkAlpha* mask, size_t maskRB,
+ SkColor color, int w, int h) {
+ if (color == SK_ColorBLACK) {
+ blit_mask_d32_a8_black(dst, dstRB, mask, maskRB, w, h);
+ } else if (SkColorGetA(color) == 0xFF) {
+ blit_mask_d32_a8_opaque(dst, dstRB, mask, maskRB, color, w, h);
+ } else {
+ blit_mask_d32_a8_general(dst, dstRB, mask, maskRB, color, w, h);
+ }
+}
+
+} // namespace SK_OPTS_NS
+
+#endif//SkBlitMask_opts_DEFINED
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