lots of sRGB and F16 blits

src/core/SkSpriteBlitter4f.cpp

Index: src/core/SkSpriteBlitter4f.cpp
diff --git a/src/core/SkSpriteBlitter4f.cpp b/src/core/SkSpriteBlitter4f.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..fc4b4809511f1bec8730afdb84b2a0ddcf326b94
--- /dev/null
+++ b/src/core/SkSpriteBlitter4f.cpp
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkSpriteBlitter.h"
+#include "SkSpanProcs.h"
+#include "SkTemplates.h"
+#include "SkXfermode.h"
+
+class Sprite_4f : public SkSpriteBlitter {
+public:
+    Sprite_4f(const SkPixmap& src, const SkPaint& paint) : INHERITED(src) {
+        fLoader = SkLoadSpanProc_Choose(src.info());
+        fFilter = SkFilterSpanProc_Choose(paint);
+        fBuffer.reset(src.width());
+    }
+    
+protected:
+    SkLoadSpanProc          fLoader;
+    SkFilterSpanProc        fFilter;
+    SkAutoTMalloc<SkPM4f>   fBuffer;
+    
+private:
+    typedef SkSpriteBlitter INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+static SkXfermode::Mode get_mode(const SkXfermode* xfer) {
+    SkXfermode::Mode mode;
+    if (!SkXfermode::AsMode(xfer, &mode)) {
+        mode = SkXfermode::kSrcOver_Mode;
+    }
+    return mode;
+}
+
+class Sprite_F16 : public Sprite_4f {
+public:
+    Sprite_F16(const SkPixmap& src, const SkPaint& paint) : INHERITED(src, paint) {
+        fState = { paint.getXfermode(), SkXfermode::kDstIsFloat16_U64Flag };
+        if (src.isOpaque()) {
+            fState.fFlags |= SkXfermode::kSrcIsOpaque_U64Flag;
+        }
+        fXfer = SkXfermode::GetU64ProcN(get_mode(fState.fXfer), fState.fFlags);
+    }
+
+    void blitRect(int x, int y, int width, int height) override {
+        SkASSERT(width > 0 && height > 0);
+        uint64_t* SK_RESTRICT dst = fDst.writable_addr64(x, y);
+        size_t dstRB = fDst.rowBytes();
+
+        for (int bottom = y + height; y < bottom; ++y) {
+            fLoader(fSource, x - fLeft, y - fTop, fBuffer, width);
+            fFilter(*fPaint, fBuffer, width);
+            fXfer(fState, dst, fBuffer, width, nullptr);
+            dst = (uint64_t* SK_RESTRICT)((char*)dst + dstRB);
+        }
+    }
+    
+private:
+    SkXfermode::U64State    fState;
+    SkXfermode::U64ProcN    fXfer;
+
+    typedef Sprite_4f INHERITED;
+};
+
+
+SkSpriteBlitter* SkSpriteBlitter::ChooseF16(const SkPixmap& source, const SkPaint& paint,
+                                            SkTBlitterAllocator* allocator) {
+    SkASSERT(allocator != nullptr);
+
+    if (paint.getMaskFilter() != nullptr) {
+        return nullptr;
+    }
+
+    switch (source.colorType()) {
+        case kN32_SkColorType:
+        case kRGBA_F16_SkColorType:
+            return allocator->createT<Sprite_F16>(source, paint);
+        default:
+            return nullptr;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+class Sprite_sRGB : public Sprite_4f {
+public:
+    Sprite_sRGB(const SkPixmap& src, const SkPaint& paint) : INHERITED(src, paint) {
+        fState = { paint.getXfermode(), SkXfermode::kDstIsSRGB_PM4fFlag };
+        if (src.isOpaque()) {
+            fState.fFlags |= SkXfermode::kSrcIsOpaque_PM4fFlag;
+        }
+        fXfer = SkXfermode::GetPM4fProcN(get_mode(fState.fXfer), fState.fFlags);
+    }
+    
+    void blitRect(int x, int y, int width, int height) override {
+        SkASSERT(width > 0 && height > 0);
+        uint32_t* SK_RESTRICT dst = fDst.writable_addr32(x, y);
+        size_t dstRB = fDst.rowBytes();
+        
+        for (int bottom = y + height; y < bottom; ++y) {
+            fLoader(fSource, x - fLeft, y - fTop, fBuffer, width);
+            fFilter(*fPaint, fBuffer, width);
+            fXfer(fState, dst, fBuffer, width, nullptr);
+            dst = (uint32_t* SK_RESTRICT)((char*)dst + dstRB);
+        }
+    }
+    
+protected:
+    SkXfermode::PM4fState   fState;
+    SkXfermode::PM4fProcN   fXfer;
+    
+private:
+    typedef Sprite_4f INHERITED;
+};
+
+
+SkSpriteBlitter* SkSpriteBlitter::ChooseS32(const SkPixmap& source, const SkPaint& paint,
+                                            SkTBlitterAllocator* allocator) {
+    SkASSERT(allocator != nullptr);
+    
+    if (paint.getMaskFilter() != nullptr) {
+        return nullptr;
+    }
+    
+    switch (source.colorType()) {
+        case kN32_SkColorType:
+        case kRGBA_F16_SkColorType:
+            return allocator->createT<Sprite_sRGB>(source, paint);
+        default:
+            return nullptr;
+    }
+}