Add animated cowboy sample from WebKit tests, and fix.

Bug: chromium:712455
Change-Id: Ic9bb9b862abe01f112cc41d28589733460b15bc1
Reviewed-on: https://skia-review.googlesource.com/50181
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 144 insertions, 0 deletions

diff --git a/samplecode/SampleCowboy.cpp b/samplecode/SampleCowboy.cpp
new file mode 100644
index 0000000000..1191cd4d3e
--- /dev/null
+++ b/samplecode/SampleCowboy.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SampleCode.h"
+#include "Resources.h"
+#include "SkCanvas.h"
+#include "SkDOM.h"
+#include "SkOSFile.h"
+#include "SkOSPath.h"
+#include "SkRect.h"
+#include "SkStream.h"
+#include "SkSVGDOM.h"
+#include "SkView.h"
+
+namespace {
+
+class CowboyView : public SampleView {
+public:
+    CowboyView()
+        : fLabel("SampleCowboy")
+        , fState(kZoomIn)
+        , fAnimationLoop(kAnimationIterations)
+        , fDelta(1) {}
+    ~CowboyView() override = default;
+
+protected:
+    static constexpr auto kAnimationIterations = 5;
+    
+    enum State {
+        kZoomIn,
+        kScroll,
+        kZoomOut
+    };
+    
+    void onOnceBeforeDraw() override {
+        fPath = GetResourcePath("Cowboy.svg");
+        SkFILEStream svgStream(fPath.c_str());
+        if (!svgStream.isValid()) {
+            SkDebugf("file not found: \"path\"\n", fPath.c_str());
+            return;
+        }
+
+        SkDOM xmlDom;
+        if (!xmlDom.build(svgStream)) {
+            SkDebugf("XML parsing failed: \"path\"\n", fPath.c_str());
+            return;
+        }
+
+        fDom = SkSVGDOM::MakeFromDOM(xmlDom);
+        if (fDom) {
+            fDom->setContainerSize(SkSize::Make(this->width(), this->height()));
+        }
+    }
+
+    void onDrawContent(SkCanvas* canvas) override {
+        if (fDom) {
+            canvas->setMatrix(SkMatrix::MakeScale(3));
+            canvas->clipRect(SkRect::MakeLTRB(0, 0, 400, 400));
+            switch (fState) {
+                case kZoomIn:
+                    fDelta += 0.2f;
+                    canvas->concat(SkMatrix::MakeScale(fDelta));
+                    break;
+                case kScroll:
+                    if (fAnimationLoop > kAnimationIterations/2) {
+                        fDelta += 80.f;
+                    } else {
+                        fDelta -= 80.f;
+                    }
+                    canvas->concat(SkMatrix::MakeScale(fDelta));
+                    canvas->translate(fDelta, 0);
+                    break;
+                case kZoomOut:
+                    fDelta += 0.2f;
+                    canvas->concat(SkMatrix::MakeScale(fDelta));
+                    break;
+            }
+            
+            fDom->render(canvas);
+        }
+    }
+
+    void onSizeChange() override {
+        if (fDom) {
+            fDom->setContainerSize(SkSize::Make(this->width(), this->height()));
+        }
+
+        this->INHERITED::onSizeChange();
+    }
+
+    bool onQuery(SkEvent* evt) override {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, fLabel.c_str());
+            return true;
+        }
+
+        return this->INHERITED::onQuery(evt);
+    }
+    
+    bool onAnimate(const SkAnimTimer& timer) override {
+        if (!fDom) {
+            return false;
+        }
+        
+        --fAnimationLoop;
+        if (fAnimationLoop == 0) {
+            fAnimationLoop = kAnimationIterations;
+            switch (fState) {
+                case kZoomIn:
+                    fState = kScroll;
+                    fDelta = 0;
+                    break;
+                case kScroll:
+                    fState = kZoomOut;
+                    fDelta = 2;
+                    break;
+                case kZoomOut:
+                    fState = kZoomIn;
+                    fDelta = 1;
+                    break;
+            }
+        }
+        return true;
+    }
+    
+private:
+    sk_sp<SkSVGDOM> fDom;
+    SkString        fPath;
+    SkString        fLabel;
+    State           fState;
+    int             fAnimationLoop;
+    SkScalar        fDelta;
+
+    typedef SampleView INHERITED;
+};
+
+} // anonymous namespace
+
+DEF_SAMPLE( return new CowboyView(); )
+