Simplified linear pipeline.

tests/SkLinearBitmapPipelineTest.cpp

+/*
+ * 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 "SkLinearBitmapPipeline.h"
+
+#include "SkColor.h"
+
+#include "Test.h"
+
+struct SinkBilerpProcessor final : public PointProcessorInterface {
+    void pointListFew(int n, Sk4fArg xs, Sk4fArg ys) override { fXs = xs; fYs = ys; }
+    void pointList4(Sk4fArg Xs, Sk4fArg Ys) override { fXs = Xs; fYs = Ys; }
+
+    Sk4f fXs;
+    Sk4f fYs;
+};
+
+using Pixel = float[4];
+DEF_TEST(SkBitmapFP, reporter) {
+
+    int width = 10;
+    int height = 10;
+    uint32_t* bitmap = new uint32_t[width * height];
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            bitmap[y * width + x] = (y << 8) + x + (128<<24);
+        }
+    }
+
+    SkPM4f* FPbuffer = new SkPM4f[width * height];
+
+    SkMatrix m = SkMatrix::I();
+    //m.setRotate(30.0f, 1.0f, 1.0f);
+    SkMatrix invert;
+    bool trash = m.invert(&invert);
+    sk_ignore_unused_variable(trash);
+
+    const SkImageInfo info =
+        SkImageInfo::MakeN32Premul(width, height, kLinear_SkColorProfileType);
+
+    SkLinearBitmapPipeline pipeline{invert, SkShader::kClamp_TileMode,
+                                    SkShader::kClamp_TileMode, info, bitmap};
+
+    int count = 10;
+
+    pipeline.shadeSpan4f(3, 6, FPbuffer, count);
+
+    Pixel* pixelBuffer = (Pixel*)FPbuffer;
+    for (int i = 0; i < count; i++) {
+        printf("i: %d - (%g, %g, %g, %g)\n", i,
+               pixelBuffer[i][0] * 255.0f,
+               pixelBuffer[i][1] * 255.0f,
+               pixelBuffer[i][2] * 255.0f,
+               pixelBuffer[i][3] * 255.0f);
+    }
+
+    delete [] bitmap;
+    delete [] FPbuffer;
+}
+