Clean up remaining users of SkPMFloat
This switches over SkXfermodes_opts.h and SkColorMatrixFilter to use Sk4f,
and converts the SkPMFloat benches to Sk4f benches.
No pixels should change here, and no code beyond the Sk4f_ benches should change speed.
The benches are faster than the old versions.
BUG=skia:4117
Review URL: https://codereview.chromium.org/1324743002
diff --git a/bench/Sk4fBench.cpp b/bench/Sk4fBench.cpp
new file mode 100644
index 0000000..5397863
--- /dev/null
+++ b/bench/Sk4fBench.cpp
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Benchmark.h"
+#include "SkColor.h"
+#include "SkNx.h"
+
+// Used to prevent the compiler from optimizing away the whole loop.
+volatile uint32_t blackhole = 0;
+
+// Not a great random number generator, but it's very fast.
+// The code we're measuring is quite fast, so low overhead is essential.
+static uint32_t lcg_rand(uint32_t* seed) {
+ *seed *= 1664525;
+ *seed += 1013904223;
+ return *seed;
+}
+
+struct Sk4fBytesRoundtripBench : public Benchmark {
+ Sk4fBytesRoundtripBench() {}
+
+ const char* onGetName() override { return "Sk4f_roundtrip"; }
+ bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
+
+ void onDraw(const int loops, SkCanvas* canvas) override {
+ // Unlike blackhole, junk can and probably will be a register.
+ uint32_t junk = 0;
+ uint32_t seed = 0;
+ for (int i = 0; i < loops; i++) {
+ uint32_t color = lcg_rand(&seed),
+ back;
+ auto f = Sk4f::FromBytes((const uint8_t*)&color);
+ f.toBytes((uint8_t*)&back);
+ junk ^= back;
+ }
+ blackhole ^= junk;
+ }
+};
+DEF_BENCH(return new Sk4fBytesRoundtripBench;)
+
+struct Sk4fGradientBench : public Benchmark {
+ const char* onGetName() override { return "Sk4f_gradient"; }
+ bool isSuitableFor(Backend backend) override { return backend == kNonRendering_Backend; }
+
+ SkPMColor fDevice[100];
+ void onDraw(const int loops, SkCanvas*) override {
+ Sk4f c0(0,0,255,255),
+ c1(255,0,0,255),
+ dc = c1 - c0,
+ fx(0.1f),
+ dx(0.002f),
+ dcdx(dc*dx),
+ dcdx4(dcdx+dcdx+dcdx+dcdx);
+
+ for (int n = 0; n < loops; n++) {
+ Sk4f a = c0 + dc*fx + Sk4f(0.5f), // add an extra 0.5f to get rounding for free.
+ b = a + dcdx,
+ c = b + dcdx,
+ d = c + dcdx;
+ for (size_t i = 0; i < SK_ARRAY_COUNT(fDevice); i += 4) {
+ a.toBytes((uint8_t*)(fDevice+i+0));
+ b.toBytes((uint8_t*)(fDevice+i+1));
+ c.toBytes((uint8_t*)(fDevice+i+2));
+ d.toBytes((uint8_t*)(fDevice+i+3));
+ a = a + dcdx4;
+ b = b + dcdx4;
+ c = c + dcdx4;
+ d = d + dcdx4;
+ }
+ }
+ }
+};
+DEF_BENCH(return new Sk4fGradientBench;)