Reland "Add particle GMs"

This reverts commit 3b01242199.

Cq-Include-Trybots: luci.skia.skia.primary:Canary-G3
Change-Id: I83ee324d5ca927413022b08fb4b48936adbc0e2e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/362058
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

BUILD.gn

@@ -1865,6 +1865,7 @@ if (skia_enable_tools) {
       ":flags",
       ":skia",
       ":tool_utils",
+      "modules/particles",
       "modules/skottie",
       "modules/skottie:gm",
       "modules/skparagraph",

gm/particles.cpp

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm/gm.h"
+
+#if !defined(SK_BUILD_FOR_GOOGLE3)  // Google3 doesn't build particles module
+
+#include "include/core/SkCanvas.h"
+#include "include/core/SkColor.h"
+#include "modules/particles/include/SkParticleEffect.h"
+#include "modules/particles/include/SkParticleSerialization.h"
+#include "modules/skresources/include/SkResources.h"
+#include "tools/Resources.h"
+
+class ParticlesGM : public skiagm::GM {
+public:
+    ParticlesGM(const char* name, double startTime, SkISize size, SkPoint origin)
+            : GM(SK_ColorBLACK), fName(name), fStartTime(startTime), fSize(size), fOrigin(origin) {}
+
+    SkString onShortName() override { return SkStringPrintf("particles_%s", fName); }
+    SkISize onISize() override { return fSize; }
+
+    void onOnceBeforeDraw() override {
+        SkParticleEffect::RegisterParticleTypes();
+
+        auto jsonData = GetResourceAsData(SkStringPrintf("particles/%s.json", fName).c_str());
+        skjson::DOM dom(static_cast<const char*>(jsonData->data()), jsonData->size());
+        SkFromJsonVisitor fromJson(dom.root());
+
+        auto resourceProvider = skresources::FileResourceProvider::Make(GetResourcePath());
+        auto effectParams = sk_make_sp<SkParticleEffectParams>();
+        effectParams->visitFields(&fromJson);
+        effectParams->prepare(resourceProvider.get());
+
+        fEffect = sk_make_sp<SkParticleEffect>(effectParams);
+        fEffect->start(/*now=*/0.0, /*looping=*/true);
+
+        // Fast-forward (in 30 fps time-slices) to the requested time
+        for (double time = 0; time < fStartTime; time += 1.0 / 30) {
+            fEffect->update(/*now=*/std::min(time, fStartTime));
+        }
+    }
+
+    bool onAnimate(double nanos) override {
+        if (fEffect) {
+            fEffect->update(fStartTime + (nanos * 1E-9));
+        }
+        return true;
+    }
+
+    void onDraw(SkCanvas* canvas) override {
+        canvas->save();
+        canvas->translate(fOrigin.fX, fOrigin.fY);
+        fEffect->draw(canvas);
+        canvas->restore();
+    }
+
+protected:
+    const char*             fName;
+    const double            fStartTime;
+    const SkISize           fSize;
+    const SkPoint           fOrigin;
+    sk_sp<SkParticleEffect> fEffect;
+};
+
+DEF_GM(return new ParticlesGM("confetti",     1.0, {400, 400}, {200, 200});)
+DEF_GM(return new ParticlesGM("cube",         1.0, {400, 400}, {200, 200});)
+DEF_GM(return new ParticlesGM("curves",       4.0, {100, 200}, { 50, 190});)
+DEF_GM(return new ParticlesGM("mandrill",     1.0, {250, 250}, { 25,  25});)
+DEF_GM(return new ParticlesGM("spiral",       2.0, {250, 250}, {125, 125});)
+DEF_GM(return new ParticlesGM("sprite_frame", 1.0, {200, 200}, {100, 100});)
+DEF_GM(return new ParticlesGM("text",         1.0, {250, 110}, { 10, 100});)
+
+#endif  // SK_BUILD_FOR_GOOGLE3

gn/gm.gni

@@ -271,6 +271,7 @@ gm_sources = [
   "$_gm/overdrawcolorfilter.cpp",
   "$_gm/overstroke.cpp",
   "$_gm/p3.cpp",
+  "$_gm/particles.cpp",
   "$_gm/patch.cpp",
   "$_gm/path_stroke_with_zero_length.cpp",
   "$_gm/patharcto.cpp",