1 files changed, 145 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/sksl/ir/SkSLLiteral.h b/gfx/skia/skia/src/sksl/ir/SkSLLiteral.h
new file mode 100644
index 0000000000..d4b0bd1be6
--- /dev/null
+++ b/gfx/skia/skia/src/sksl/ir/SkSLLiteral.h
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_FLOATLITERAL
+#define SKSL_FLOATLITERAL
+
+#include "include/core/SkTypes.h"
+#include "include/private/SkSLDefines.h"
+#include "include/private/SkSLIRNode.h"
+#include "include/sksl/SkSLPosition.h"
+#include "src/sksl/SkSLBuiltinTypes.h"
+#include "src/sksl/SkSLContext.h"
+#include "src/sksl/ir/SkSLExpression.h"
+#include "src/sksl/ir/SkSLType.h"
+
+#include <cstdint>
+#include <cinttypes>
+#include <memory>
+#include <optional>
+#include <string>
+
+namespace SkSL {
+
+enum class OperatorPrecedence : uint8_t;
+
+/**
+ * A literal value. These can contain ints, floats, or booleans.
+ */
+
+class Literal : public Expression {
+public:
+    inline static constexpr Kind kIRNodeKind = Kind::kLiteral;
+
+    Literal(Position pos, double value, const Type* type)
+        : INHERITED(pos, kIRNodeKind, type)
+        , fValue(value) {}
+
+    // Makes a literal of $floatLiteral type.
+    static std::unique_ptr<Literal> MakeFloat(const Context& context, Position pos,
+            float value) {
+        return std::make_unique<Literal>(pos, value, context.fTypes.fFloatLiteral.get());
+    }
+
+    // Makes a float literal of the specified type.
+    static std::unique_ptr<Literal> MakeFloat(Position pos, float value, const Type* type) {
+        SkASSERT(type->isFloat());
+        return std::make_unique<Literal>(pos, value, type);
+    }
+
+    // Makes a literal of $intLiteral type.
+    static std::unique_ptr<Literal> MakeInt(const Context& context, Position pos,
+            SKSL_INT value) {
+        return std::make_unique<Literal>(pos, value, context.fTypes.fIntLiteral.get());
+    }
+
+    // Makes an int literal of the specified type.
+    static std::unique_ptr<Literal> MakeInt(Position pos, SKSL_INT value, const Type* type) {
+        SkASSERT(type->isInteger());
+        SkASSERTF(value >= type->minimumValue(), "Value %" PRId64 " does not fit in type %s",
+                                                 value, type->description().c_str());
+        SkASSERTF(value <= type->maximumValue(), "Value %" PRId64 " does not fit in type %s",
+                                                 value, type->description().c_str());
+        return std::make_unique<Literal>(pos, value, type);
+    }
+
+    // Makes a literal of boolean type.
+    static std::unique_ptr<Literal> MakeBool(const Context& context, Position pos, bool value) {
+        return std::make_unique<Literal>(pos, value, context.fTypes.fBool.get());
+    }
+
+    // Makes a literal of boolean type. (Functionally identical to the above, but useful if you
+    // don't have access to the Context.)
+    static std::unique_ptr<Literal> MakeBool(Position pos, bool value, const Type* type) {
+        SkASSERT(type->isBoolean());
+        return std::make_unique<Literal>(pos, value, type);
+    }
+
+    // Makes a literal of the specified type, rounding as needed.
+    static std::unique_ptr<Literal> Make(Position pos, double value, const Type* type) {
+        if (type->isFloat()) {
+            return MakeFloat(pos, value, type);
+        }
+        if (type->isInteger()) {
+            return MakeInt(pos, value, type);
+        }
+        SkASSERT(type->isBoolean());
+        return MakeBool(pos, value, type);
+    }
+
+    float floatValue() const {
+        SkASSERT(this->type().isFloat());
+        return (SKSL_FLOAT)fValue;
+    }
+
+    SKSL_INT intValue() const {
+        SkASSERT(this->type().isInteger());
+        return (SKSL_INT)fValue;
+    }
+
+    SKSL_INT boolValue() const {
+        SkASSERT(this->type().isBoolean());
+        return (bool)fValue;
+    }
+
+    double value() const {
+        return fValue;
+    }
+
+    std::string description(OperatorPrecedence) const override;
+
+    ComparisonResult compareConstant(const Expression& other) const override {
+        if (!other.is<Literal>() || this->type().numberKind() != other.type().numberKind()) {
+            return ComparisonResult::kUnknown;
+        }
+        return this->value() == other.as<Literal>().value()
+                       ? ComparisonResult::kEqual
+                       : ComparisonResult::kNotEqual;
+    }
+
+    std::unique_ptr<Expression> clone(Position pos) const override {
+        return std::make_unique<Literal>(pos, this->value(), &this->type());
+    }
+
+    bool supportsConstantValues() const override {
+        return true;
+    }
+
+    std::optional<double> getConstantValue(int n) const override {
+        SkASSERT(n == 0);
+        return fValue;
+    }
+
+private:
+    double fValue;
+
+    using INHERITED = Expression;
+};
+
+}  // namespace SkSL
+
+#endif