add new blit2 methods in support of antialiased hairlines guard flag SK_SUPPORT_LEGACY_BLITANTIH2V2

src/core/SkBlitter_ARGB32.cpp

Index: src/core/SkBlitter_ARGB32.cpp
diff --git a/src/core/SkBlitter_ARGB32.cpp b/src/core/SkBlitter_ARGB32.cpp
index bbad6c792664dc0d51e23e4570aa27eef84f19e9..caf85ddc1fec65b2cbeb64ea1968f6ca90f0471d 100644
--- a/src/core/SkBlitter_ARGB32.cpp
+++ b/src/core/SkBlitter_ARGB32.cpp
@@ -106,6 +106,25 @@ void SkARGB32_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
     }
 }
 
+#ifndef SK_SUPPORT_LEGACY_BLITANTIH2V2
+void SkARGB32_Blitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
+    uint32_t* device = fDevice.getAddr32(x, y);
+    SkDEBUGCODE((void)fDevice.getAddr32(x + 1, y);)
+    
+    device[0] = SkBlendARGB32(fPMColor, device[0], a0);
+    device[1] = SkBlendARGB32(fPMColor, device[1], a1);
+}
+
+void SkARGB32_Blitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
+    uint32_t* device = fDevice.getAddr32(x, y);
+    SkDEBUGCODE((void)fDevice.getAddr32(x, y + 1);)
+    
+    device[0] = SkBlendARGB32(fPMColor, device[0], a0);
+    device = (uint32_t*)((char*)device + fDevice.rowBytes());
+    device[0] = SkBlendARGB32(fPMColor, device[0], a1);
+}
+#endif
+
 //////////////////////////////////////////////////////////////////////////////////////
 
 #define solid_8_pixels(mask, dst, color)    \
@@ -180,6 +199,25 @@ void SkARGB32_Opaque_Blitter::blitMask(const SkMask& mask,
     }
 }
 
+#ifndef SK_SUPPORT_LEGACY_BLITANTIH2V2
+void SkARGB32_Opaque_Blitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
+    uint32_t* device = fDevice.getAddr32(x, y);
+    SkDEBUGCODE((void)fDevice.getAddr32(x + 1, y);)
+
+    device[0] = SkFastFourByteInterp(fPMColor, device[0], a0);
+    device[1] = SkFastFourByteInterp(fPMColor, device[1], a1);
+}
+
+void SkARGB32_Opaque_Blitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
+    uint32_t* device = fDevice.getAddr32(x, y);
+    SkDEBUGCODE((void)fDevice.getAddr32(x, y + 1);)
+
+    device[0] = SkFastFourByteInterp(fPMColor, device[0], a0);
+    device = (uint32_t*)((char*)device + fDevice.rowBytes());
+    device[0] = SkFastFourByteInterp(fPMColor, device[0], a1);
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkARGB32_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
@@ -256,6 +294,25 @@ void SkARGB32_Black_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
     }
 }
 
+#ifndef SK_SUPPORT_LEGACY_BLITANTIH2V2
+void SkARGB32_Black_Blitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
+    uint32_t* device = fDevice.getAddr32(x, y);
+    SkDEBUGCODE((void)fDevice.getAddr32(x + 1, y);)
+
+    device[0] = (a0 << SK_A32_SHIFT) + SkAlphaMulQ(device[0], 256 - a0);
+    device[1] = (a1 << SK_A32_SHIFT) + SkAlphaMulQ(device[1], 256 - a1);
+}
+
+void SkARGB32_Black_Blitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
+    uint32_t* device = fDevice.getAddr32(x, y);
+    SkDEBUGCODE((void)fDevice.getAddr32(x, y + 1);)
+    
+    device[0] = (a0 << SK_A32_SHIFT) + SkAlphaMulQ(device[0], 256 - a0);
+    device = (uint32_t*)((char*)device + fDevice.rowBytes());
+    device[0] = (a1 << SK_A32_SHIFT) + SkAlphaMulQ(device[0], 256 - a1);
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 // Special version of SkBlitRow::Factory32 that knows we're in kSrc_Mode,