Add samples to Viewer.

samplecode/SampleCode.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 "SampleCode.h"
+#include "SkCanvas.h"
+
+#if SK_SUPPORT_GPU
+#   include "GrContext.h"
+#   if SK_ANGLE
+#       include "gl/angle/GLTestContext_angle.h"
+#   endif
+#else
+class GrContext;
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+
+bool SampleCode::CharQ(const SkEvent& evt, SkUnichar* outUni) {
+    if (evt.isType(gCharEvtName, sizeof(gCharEvtName) - 1)) {
+        if (outUni) {
+            *outUni = evt.getFast32();
+        }
+        return true;
+    }
+    return false;
+}
+
+bool SampleCode::KeyQ(const SkEvent& evt, SkKey* outKey) {
+    if (evt.isType(gKeyEvtName, sizeof(gKeyEvtName) - 1)) {
+        if (outKey) {
+            *outKey = (SkKey)evt.getFast32();
+        }
+        return true;
+    }
+    return false;
+}
+
+bool SampleCode::TitleQ(const SkEvent& evt) {
+    return evt.isType(gTitleEvtName, sizeof(gTitleEvtName) - 1);
+}
+
+void SampleCode::TitleR(SkEvent* evt, const char title[]) {
+    SkASSERT(evt && TitleQ(*evt));
+    evt->setString(gTitleEvtName, title);
+}
+
+bool SampleCode::RequestTitle(SkView* view, SkString* title) {
+    SkEvent evt(gTitleEvtName);
+    if (view->doQuery(&evt)) {
+        title->set(evt.findString(gTitleEvtName));
+        return true;
+    }
+    return false;
+}
+
+bool SampleCode::PrefSizeQ(const SkEvent& evt) {
+    return evt.isType(gPrefSizeEvtName, sizeof(gPrefSizeEvtName) - 1);
+}
+
+void SampleCode::PrefSizeR(SkEvent* evt, SkScalar width, SkScalar height) {
+    SkASSERT(evt && PrefSizeQ(*evt));
+    SkScalar size[2];
+    size[0] = width;
+    size[1] = height;
+    evt->setScalars(gPrefSizeEvtName, 2, size);
+}
+
+bool SampleCode::FastTextQ(const SkEvent& evt) {
+    return evt.isType(gFastTextEvtName, sizeof(gFastTextEvtName) - 1);
+}
+
+SkViewRegister* SkViewRegister::gHead;
+SkViewRegister::SkViewRegister(SkViewFactory* fact) : fFact(fact) {
+    fFact->ref();
+    fChain = gHead;
+    gHead = this;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkFuncViewFactory::SkFuncViewFactory(SkViewCreateFunc func)
+    : fCreateFunc(func) {
+}
+
+SkView* SkFuncViewFactory::operator() () const {
+    return (*fCreateFunc)();
+}
+
+#include "GMSampleView.h"
+
+SkGMSampleViewFactory::SkGMSampleViewFactory(GMFactoryFunc func)
+    : fFunc(func) {
+}
+
+SkView* SkGMSampleViewFactory::operator() () const {
+    skiagm::GM* gm = fFunc(nullptr);
+    gm->setMode(skiagm::GM::kSample_Mode);
+    return new GMSampleView(gm);
+}
+
+SkViewRegister::SkViewRegister(SkViewCreateFunc func) {
+    fFact = new SkFuncViewFactory(func);
+    fChain = gHead;
+    gHead = this;
+}
+
+SkViewRegister::SkViewRegister(GMFactoryFunc func) {
+    fFact = new SkGMSampleViewFactory(func);
+    fChain = gHead;
+    gHead = this;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+static const char is_sample_view_tag[] = "sample-is-sample-view";
+static const char repeat_count_tag[] = "sample-set-repeat-count";
+
+bool SampleView::IsSampleView(SkView* view) {
+    SkEvent evt(is_sample_view_tag);
+    return view->doQuery(&evt);
+}
+
+bool SampleView::SetRepeatDraw(SkView* view, int count) {
+    SkEvent evt(repeat_count_tag);
+    evt.setFast32(count);
+    return view->doEvent(evt);
+}
+
+bool SampleView::onEvent(const SkEvent& evt) {
+    if (evt.isType(repeat_count_tag)) {
+        fRepeatCount = evt.getFast32();
+        return true;
+    }
+    return this->INHERITED::onEvent(evt);
+}
+
+bool SampleView::onQuery(SkEvent* evt) {
+    if (evt->isType(is_sample_view_tag)) {
+        return true;
+    }
+    return this->INHERITED::onQuery(evt);
+}
+
+void SampleView::onDraw(SkCanvas* canvas) {
+    if (!fHaveCalledOnceBeforeDraw) {
+        fHaveCalledOnceBeforeDraw = true;
+        this->onOnceBeforeDraw();
+    }
+    this->onDrawBackground(canvas);
+
+    for (int i = 0; i < fRepeatCount; i++) {
+        SkAutoCanvasRestore acr(canvas, true);
+        this->onDrawContent(canvas);
+#if SK_SUPPORT_GPU
+        // Ensure the GrContext doesn't batch across draw loops.
+        if (GrContext* context = canvas->getGrContext()) {
+            context->flush();
+        }
+#endif
+    }
+}
+
+void SampleView::onDrawBackground(SkCanvas* canvas) {
+    canvas->drawColor(fBGColor);
+}
+