WIP RasterCanvasLayerAllocator

tests/LayerAllocatorTest.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 "Test.h"
+
+#include "SkCanvas.h"
+#include "SkRasterCanvasLayerAllocator.h"
+
+class TestAllocator : public SkRasterCanvasLayerAllocator {
+public:
+    TestAllocator() : flushCount(0), allocated(false) {}
+    virtual ~TestAllocator() {}
+
+    void* getNativeContext(void* buffer) override;
+    void flush() override;
+    void free(void* buffer, void* nativeContext) override;
+
+    int nativeLayerSentry;
+    int nativeContextSentry;
+    int flushCount;
+    bool allocated;
+
+protected:
+    void* allocateLayer(const SkImageInfo& info, size_t* rowBytes) override;
+};
+
+void* TestAllocator::getNativeContext(void* buffer) {
+    return &this->nativeContextSentry;
+}
+
+void TestAllocator::flush() {
+    flushCount++;
+}
+
+void TestAllocator::free(void* buffer, void* nativeContext) {
+    SkASSERT(this->allocated);
+    this->allocated = false;
+}
+
+void* TestAllocator::allocateLayer(const SkImageInfo& info, size_t* rowBytes) {
+    SkASSERT(!this->allocated);
+    this->allocated = true;
+    return &this->nativeLayerSentry;
+}
+
+// Need to trigger:
+//    SkBitmapDevice::onCreateDevice() - hit in SkCanvas::internalSaveLayer()
+
+DEF_TEST(TestAllocator, reporter) {
+    TestAllocator* allocator = new TestAllocator;
+    SkCanvas* canvas = allocator->CreateCanvas(SkImageInfo::MakeN32Premul(100, 100));
+
+    REPORTER_ASSERT(reporter,
+        canvas->getTopLayerNative() == &allocator->nativeContextSentry);
+    REPORTER_ASSERT(reporter,
+        canvas->accessTopLayerPixels(nullptr, nullptr) == &allocator->nativeLayerSentry);
+
+    canvas->saveLayer(nullptr, nullptr);
+
+    REPORTER_ASSERT(reporter,
+        canvas->getTopLayerNative() == &allocator->nativeContextSentry);
+    REPORTER_ASSERT(reporter,
+        canvas->accessTopLayerPixels(nullptr, nullptr) == &allocator->nativeLayerSentry);
+}
+