SkValue: SkXfermode

src/core/SkValue.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 <unordered_map>
+
+#include "SkData.h"
+#include "SkValue.h"
+
+// WARNING:  this implementation is for testing purposes only.
+// TODO(mtklein): replace with something less fragile later.

[mtklein, 2016/01/15 17:26:20]

Goodness no.  Copy.  Not going to ask again.

[hal.canary, 2016/01/15 19:44:31]

done

+class SkValue::Obj : public SkRefCnt {
+public:
+    std::unordered_map<SkValue::Key, SkValue> fMap;
+    std::atomic<bool> fReadOnly;
+    Obj() : fReadOnly(false) {}
+};
+
+SkValue::SkValue() : fType(Null) {}
+
+SkValue::SkValue(const SkValue& o) {
+    memcpy(this, &o, sizeof(o));
+    if (Bytes == fType) {
+        fBytes->ref();
+    } else if (this->isObject()) {
+        fObject->ref();
+        fObject->fReadOnly = true;
+    }
+}
+
+SkValue::SkValue(SkValue&& o) {
+    memcpy(this, &o, sizeof(o));
+    new (&o) SkValue();
+}
+
+SkValue& SkValue::operator=(const SkValue& o) {
+    if (this != &o) {
+        this->~SkValue();
+        new (this) SkValue(o);
+    }
+    return *this;
+}
+
+SkValue& SkValue::operator=(SkValue&& o) {
+    if (this != &o) {
+        this->~SkValue();
+        new (this) SkValue(std::move(o));
+    }
+    return *this;
+}
+
+SkValue::~SkValue() {
+    if (Bytes == fType) {
+        fBytes->unref();
+    } else if (this->isObject()) {
+        fObject->unref();
+    }
+}
+
+#define FN(NAME, LNAME, TYPE)             \
+    SkValue SkValue::From##NAME(TYPE x) { \
+        SkValue v;                        \
+        v.fType = NAME;                   \
+        v.f##NAME = x;                    \
+        return v;                         \
+    }                                     \
+    TYPE SkValue::LNAME() const {         \
+        SkASSERT(NAME == fType);          \
+        return f##NAME;                   \
+    }
+FN(S32, s32, int32_t)
+FN(U32, u32, uint32_t)
+FN(F32, f32, float)
+#undef FN
+
+SkValue SkValue::FromBytes(const void* data, size_t length) {
+    SkValue v;
+    v.fType = Bytes;
+    reinterpret_cast<SkData*&>(v.fBytes) = SkData::NewWithCopy(data, length);
+    return v;
+}
+
+SkValue SkValue::Object(SkValue::Type t) {
+    SkValue v;
+    v.fType = t;
+    SkASSERT(v.isObject());
+    v.fObject = new Obj;
+    return v;
+}
+
+SkValue::Type SkValue::type() const { return fType; }
+
+const void* SkValue::bytes() const {
+    return Bytes == fType ? fBytes->data() : nullptr;
+}
+
+size_t SkValue::count() const {
+    if (Bytes == fType) {
+        return fBytes->size();
+    } else if (this->isObject()) {
+        return fObject->fMap.size();
+    }
+    return 0;
+}
+
+bool SkValue::set(SkValue::Key k, SkValue v) {
+    if (!this->isObject() || fObject->fReadOnly) {
+        return false;
+    }
+    fObject->fMap[k] = std::move(v);
+    return true;
+}
+
+const SkValue* SkValue::get(SkValue::Key k) const {
+    if (!this->isObject()) {
+        return nullptr;
+    }
+    auto it = fObject->fMap.find(k);
+    return it != fObject->fMap.end() ? &it->second : nullptr;
+}
+
+void SkValue::foreach(std::function<void(Key, const SkValue&)> fn) const {
+    if (!this->isObject()) {
+        return;
+    }
+    for (const auto& pair : fObject->fMap) {
+        fn(pair.first, pair.second);
+    }
+}