Add support for serializing/deserializing of SkDrawable

tests/SerializeDrawableTest.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 "SkCanvas.h"
+#include "SkDrawable.h"
+#include "SkReadBuffer.h"
+#include "SkRect.h"
+#include "SkSerializeDrawable.h"
+#include "SkStream.h"
+#include "SkWriteBuffer.h"
+#include "Test.h"
+
+class SkIntDrawable : public SkDrawable {
+public:
+    SkIntDrawable(uint32_t a, uint32_t b, uint32_t c, uint32_t d)
+        : fA(a)
+        , fB(b)
+        , fC(c)
+        , fD(d)
+    {}
+
+    void flatten(SkWriteBuffer& buffer) const override {
+        buffer.writeUInt(fA);
+        buffer.writeUInt(fB);
+        buffer.writeUInt(fC);
+        buffer.writeUInt(fD);
+    }
+
+    static SkFlattenable* CreateProc(SkReadBuffer& buffer) {
+        uint32_t a = buffer.readUInt();
+        uint32_t b = buffer.readUInt();
+        uint32_t c = buffer.readUInt();
+        uint32_t d = buffer.readUInt();
+        return new SkIntDrawable(a, b, c, d);
+    }
+
+    Factory getFactory() const override { return CreateProc; }
+
+    uint32_t a() const { return fA; }
+    uint32_t b() const { return fB; }
+    uint32_t c() const { return fC; }
+    uint32_t d() const { return fD; }
+
+protected:
+    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
+    void onDraw(SkCanvas*) override {}
+
+private:
+    uint32_t fA;
+    uint32_t fB;
+    uint32_t fC;
+    uint32_t fD;
+};
+
+class SkPaintDrawable : public SkDrawable {
+public:
+    SkPaintDrawable(const SkPaint& paint)
+        : fPaint(paint)
+    {}
+
+    void flatten(SkWriteBuffer& buffer) const override {
+        buffer.writePaint(fPaint);
+    }
+
+    static SkFlattenable* CreateProc(SkReadBuffer& buffer) {
+        SkPaint paint;
+        buffer.readPaint(&paint);
+        return new SkPaintDrawable(paint);
+    }
+
+    Factory getFactory() const override { return CreateProc; }
+
+    const SkPaint& paint() const { return fPaint; }
+
+protected:
+    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
+    void onDraw(SkCanvas*) override {}
+
+private:
+    SkPaint fPaint;
+};
+
+class SkCompoundDrawable : public SkDrawable {
+public:
+    SkCompoundDrawable(uint32_t a, uint32_t b, uint32_t c, uint32_t d, const SkPaint& paint)
+        : fIntDrawable(new SkIntDrawable(a, b, c, d))
+        , fPaintDrawable(new SkPaintDrawable(paint))
+    {}
+
+    SkCompoundDrawable(SkIntDrawable* intDrawable, SkPaintDrawable* paintDrawable)
+        : fIntDrawable(SkRef(intDrawable))
+        , fPaintDrawable(SkRef(paintDrawable))
+    {}
+
+    void flatten(SkWriteBuffer& buffer) const override {
+        buffer.writeFlattenable(fIntDrawable);
+        buffer.writeFlattenable(fPaintDrawable);
+    }
+
+    static SkFlattenable* CreateProc(SkReadBuffer& buffer) {
+        SkAutoTUnref<SkFlattenable> intDrawable(
+                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
+        SkASSERT(intDrawable);
+        SkASSERT(!strcmp("SkIntDrawable", intDrawable->getTypeName()));
+
+        SkAutoTUnref<SkFlattenable> paintDrawable(
+                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
+        SkASSERT(paintDrawable);
+        SkASSERT(!strcmp("SkPaintDrawable", paintDrawable->getTypeName()));
+
+        return new SkCompoundDrawable((SkIntDrawable*) intDrawable.get(),
+                                      (SkPaintDrawable*) paintDrawable.get());
+    }
+
+    Factory getFactory() const override { return CreateProc; }
+
+    SkIntDrawable* intDrawable() const { return fIntDrawable; }
+    SkPaintDrawable* paintDrawable() const { return fPaintDrawable; }
+
+protected:
+    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
+    void onDraw(SkCanvas*) override {}
+
+private:
+    SkAutoTUnref<SkIntDrawable>   fIntDrawable;
+    SkAutoTUnref<SkPaintDrawable> fPaintDrawable;
+};
+
+class SkRootDrawable : public SkDrawable {
+public:
+    SkRootDrawable(uint32_t a, uint32_t b, uint32_t c, uint32_t d, const SkPaint& paint,
+                   uint32_t e, uint32_t f, uint32_t g, uint32_t h, SkDrawable* drawable)
+        : fCompoundDrawable(new SkCompoundDrawable(a, b, c, d, paint))
+        , fIntDrawable(new SkIntDrawable(e, f, g, h))
+        , fDrawable(SkRef(drawable))
+    {}
+
+    SkRootDrawable(SkCompoundDrawable* compoundDrawable, SkIntDrawable* intDrawable,
+            SkDrawable* drawable)
+        : fCompoundDrawable(SkRef(compoundDrawable))
+        , fIntDrawable(SkRef(intDrawable))
+        , fDrawable(SkRef(drawable))
+    {}
+
+    void flatten(SkWriteBuffer& buffer) const override {
+        buffer.writeFlattenable(fCompoundDrawable);
+        buffer.writeFlattenable(fIntDrawable);
+        buffer.writeFlattenable(fDrawable);
+    }
+
+    static SkFlattenable* CreateProc(SkReadBuffer& buffer) {
+        SkAutoTUnref<SkFlattenable> compoundDrawable(
+                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
+        SkASSERT(compoundDrawable);
+        SkASSERT(!strcmp("SkCompoundDrawable", compoundDrawable->getTypeName()));
+
+        SkAutoTUnref<SkFlattenable> intDrawable(
+                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
+        SkASSERT(intDrawable);
+        SkASSERT(!strcmp("SkIntDrawable", intDrawable->getTypeName()));
+
+        SkAutoTUnref<SkFlattenable> drawable(
+                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
+        SkASSERT(drawable);
+
+        return new SkRootDrawable((SkCompoundDrawable*) compoundDrawable.get(),
+                                  (SkIntDrawable*) intDrawable.get(),
+                                  (SkDrawable*) drawable.get());
+    }
+
+    Factory getFactory() const override { return CreateProc; }
+
+    SkCompoundDrawable* compoundDrawable() const { return fCompoundDrawable; }
+    SkIntDrawable* intDrawable() const { return fIntDrawable; }
+    SkDrawable* drawable() const { return fDrawable; }
+
+protected:
+    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
+    void onDraw(SkCanvas*) override {}
+
+private:
+    SkAutoTUnref<SkCompoundDrawable> fCompoundDrawable;
+    SkAutoTUnref<SkIntDrawable>      fIntDrawable;
+    SkAutoTUnref<SkDrawable>         fDrawable;
+};
+
+DEF_TEST(SerializeDrawable, r) {
+    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkIntDrawable)

[msarett, 2016/03/29 15:29:18]

Still need to think about how to register drawables from Android...

+    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkPaintDrawable)
+    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkCompoundDrawable)
+    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkRootDrawable)
+
+    // Create and serialize the test drawable
+    SkAutoTUnref<SkDrawable> drawable(new SkIntDrawable(1, 2, 3, 4));
+    SkPaint paint;
+    paint.setColor(SK_ColorBLUE);
+    SkAutoTUnref<SkRootDrawable> rootDrawable(new SkRootDrawable(5, 6, 7, 8, paint, 9, 10, 11, 12,
+                                                                 drawable));
+    SkAutoTDelete<SkWriteBuffer> writeBuffer(SkSerializeDrawable::Serialize(*rootDrawable));
+
+    // Copy the contents of the write buffer into a read buffer
+    sk_sp<SkData> data = SkData::MakeUninitialized(writeBuffer->bytesWritten());
+    writeBuffer->writeToMemory(data->writable_data());
+    SkReadBuffer readBuffer(data->data(), data->size());
+
+    // Deserialize and verify the drawable
+    SkAutoTUnref<SkDrawable> out(SkSerializeDrawable::NewFromSerialized(readBuffer));
+    REPORTER_ASSERT(r, out);
+    REPORTER_ASSERT(r, !strcmp("SkRootDrawable", out->getTypeName()));
+
+    SkRootDrawable* root = (SkRootDrawable*) out.get();
+    REPORTER_ASSERT(r, 5 == root->compoundDrawable()->intDrawable()->a());
+    REPORTER_ASSERT(r, 6 == root->compoundDrawable()->intDrawable()->b());
+    REPORTER_ASSERT(r, 7 == root->compoundDrawable()->intDrawable()->c());
+    REPORTER_ASSERT(r, 8 == root->compoundDrawable()->intDrawable()->d());
+    REPORTER_ASSERT(r, SK_ColorBLUE ==
+            root->compoundDrawable()->paintDrawable()->paint().getColor());
+    REPORTER_ASSERT(r, 9 == root->intDrawable()->a());
+    REPORTER_ASSERT(r, 10 == root->intDrawable()->b());
+    REPORTER_ASSERT(r, 11 == root->intDrawable()->c());
+    REPORTER_ASSERT(r, 12 == root->intDrawable()->d());
+
+    // Note that we can still recognize the generic drawable as int drawable
+    SkDrawable* generic = root->drawable();
+    REPORTER_ASSERT(r, !strcmp("SkIntDrawable", generic->getTypeName()));
+    SkIntDrawable* integer = (SkIntDrawable*) generic;
+    REPORTER_ASSERT(r, 1 == integer->a());
+    REPORTER_ASSERT(r, 2 == integer->b());
+    REPORTER_ASSERT(r, 3 == integer->c());
+    REPORTER_ASSERT(r, 4 == integer->d());
+}