blitters for sRGB and float16

src/core/SkShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAtomics.h"
 #include "SkBitmapProcShader.h"
 #include "SkColorShader.h"
@@ skipping 99 matching lines @@
 
     fPaintAlpha = rec.fPaint->getAlpha();
 }
 
 SkShader::Context::~Context() {}
 
 SkShader::Context::ShadeProc SkShader::Context::asAShadeProc(void** ctx) {
     return nullptr;
 }
 
-void SkShader::Context::shadeSpan4f(int x, int y, SkPM4f[], int count) {
-    SkASSERT(false && "shadeSpan4f called but not implemented");
+void SkShader::Context::shadeSpan4f(int x, int y, SkPM4f dst[], int count) {
+    const int N = 128;
+    SkPMColor tmp[N];
+    while (count > 0) {
+        int n = SkTMin(count, N);
+        this->shadeSpan(x, y, tmp, n);
+        for (int i = 0; i < n; ++i) {
+            dst[i] = SkPM4f::FromPMColor(tmp[i]);
+        }
+        dst += n;
+        x += n;
+        count -= n;
+    }
 }
 
 #include "SkColorPriv.h"
 
 #define kTempColorQuadCount 6   // balance between speed (larger) and saving stack-space
 #define kTempColorCount     (kTempColorQuadCount << 2)
 
 #ifdef SK_CPU_BENDIAN
     #define SkU32BitShiftToByteOffset(shift)    (3 - ((shift) >> 3))
 #else
@@ skipping 222 matching lines @@
 #include "SkEmptyShader.h"
 
 void SkEmptyShader::toString(SkString* str) const {
     str->append("SkEmptyShader: (");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif