lots of sRGB and F16 blits

src/core/SkSpanProcs.cpp

Index: src/core/SkSpanProcs.cpp
diff --git a/src/core/SkSpanProcs.cpp b/src/core/SkSpanProcs.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..efbce9704a8ceb35f48c696db069dd89d82388b7
--- /dev/null
+++ b/src/core/SkSpanProcs.cpp
@@ -0,0 +1,95 @@
+/*
+ * 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 "SkColorFilter.h"
+#include "SkHalf.h"
+#include "SkNx.h"
+#include "SkPaint.h"
+#include "SkPixmap.h"
+#include "SkPM4f.h"
+#include "SkPM4fPriv.h"
+#include "SkSpanProcs.h"
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+static void load_l32(const SkPixmap& src, int x, int y, SkPM4f span[], int count) {
+    SkASSERT(count > 0);
+    const uint32_t* addr = src.addr32(x, y);
+    SkASSERT(src.addr32(x + count - 1, y));
+
+    for (int i = 0; i < count; ++i) {
+        (SkNx_cast<float>(Sk4b::Load(&addr[i])) * Sk4f(1.0f/255)).store(span[i].fVec);
+    }
+}
+
+static void load_s32(const SkPixmap& src, int x, int y, SkPM4f span[], int count) {
+    SkASSERT(count > 0);
+    const uint32_t* addr = src.addr32(x, y);
+    SkASSERT(src.addr32(x + count - 1, y));
+
+    for (int i = 0; i < count; ++i) {
+        srgb_to_linear(SkNx_cast<float>(Sk4b::Load(&addr[i])) * Sk4f(1.0f/255)).store(span[i].fVec);
+    }
+}
+
+static void load_f16(const SkPixmap& src, int x, int y, SkPM4f span[], int count) {
+    SkASSERT(count > 0);
+    const uint64_t* addr = src.addr64(x, y);
+    SkASSERT(src.addr64(x + count - 1, y));
+
+    for (int i = 0; i < count; ++i) {
+        SkHalfToFloat_01(addr[i]).store(span[i].fVec);
+    }
+}
+
+SkLoadSpanProc SkLoadSpanProc_Choose(const SkImageInfo& info) {
+    switch (info.colorType()) {
+        case kN32_SkColorType:
+            return info.isSRGB() ? load_s32 : load_l32;
+        case kRGBA_F16_SkColorType:
+            return load_f16;
+        default:
+            return nullptr;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+static void noop_filterspan(const SkPaint& paint, SkPM4f[], int) {
+    SkASSERT(!paint.getColorFilter());
+    SkASSERT(0xFF == paint.getAlpha());
+}
+
+static void alpha_filterspan(const SkPaint& paint, SkPM4f span[], int count) {
+    SkASSERT(!paint.getColorFilter());
+    SkASSERT(0xFF != paint.getAlpha());
+    const Sk4f scale = Sk4f(paint.getAlpha() * (1.0f/255));
+    for (int i = 0; i < count; ++i) {
+        (Sk4f::Load(span[i].fVec) * scale).store(span[i].fVec);
+    }
+}
+
+static void colorfilter_filterspan(const SkPaint& paint, SkPM4f span[], int count) {
+    SkASSERT(paint.getColorFilter());
+    SkASSERT(0xFF == paint.getAlpha());
+    paint.getColorFilter()->filterSpan4f(span, count, span);
+}
+
+static void colorfilter_alpha_filterspan(const SkPaint& paint, SkPM4f span[], int count) {
+    SkASSERT(paint.getColorFilter());
+    SkASSERT(0xFF != paint.getAlpha());
+    alpha_filterspan(paint, span, count);
+    paint.getColorFilter()->filterSpan4f(span, count, span);
+}
+
+SkFilterSpanProc SkFilterSpanProc_Choose(const SkPaint& paint) {
+    if (paint.getColorFilter()) {
+        return 0xFF == paint.getAlpha() ? colorfilter_filterspan : colorfilter_alpha_filterspan;
+    } else {
+        return 0xFF == paint.getAlpha() ? noop_filterspan : alpha_filterspan;
+    }
+}