| // Copyright 2018 Google LLC. |
| // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. |
| #ifndef SkPDFUnion_DEFINED |
| #define SkPDFUnion_DEFINED |
| |
| #include "src/pdf/SkPDFTypes.h" |
| |
| /** |
| A SkPDFUnion is a non-virtualized implementation of the |
| non-compound, non-specialized PDF Object types: Name, String, |
| Number, Boolean. |
| */ |
| class SkPDFUnion { |
| public: |
| // Move constructor and assignment operator destroy the argument |
| // and steal their references (if needed). |
| SkPDFUnion(SkPDFUnion&&); |
| SkPDFUnion& operator=(SkPDFUnion&&); |
| |
| ~SkPDFUnion(); |
| |
| /** The following nine functions are the standard way of creating |
| SkPDFUnion objects. */ |
| |
| static SkPDFUnion Int(int32_t); |
| |
| static SkPDFUnion Int(size_t v) { return SkPDFUnion::Int(SkToS32(v)); } |
| |
| static SkPDFUnion Bool(bool); |
| |
| static SkPDFUnion Scalar(SkScalar); |
| |
| static SkPDFUnion ColorComponent(uint8_t); |
| |
| static SkPDFUnion ColorComponentF(float); |
| |
| /** These two functions do NOT take ownership of char*, and do NOT |
| copy the string. Suitable for passing in static const |
| strings. For example: |
| SkPDFUnion n = SkPDFUnion::Name("Length"); |
| SkPDFUnion u = SkPDFUnion::String("Identity"); */ |
| |
| /** SkPDFUnion::Name(const char*) assumes that the passed string |
| is already a valid name (that is: it has no control or |
| whitespace characters). This will not copy the name. */ |
| static SkPDFUnion Name(const char*); |
| |
| /** SkPDFUnion::String will encode the passed string. This will not copy. */ |
| static SkPDFUnion ByteString(const char*); |
| static SkPDFUnion TextString(const char*); |
| |
| /** SkPDFUnion::Name(SkString) does not assume that the |
| passed string is already a valid name and it will escape the |
| string. */ |
| static SkPDFUnion Name(SkString); |
| |
| /** SkPDFUnion::String will encode the passed string. */ |
| static SkPDFUnion ByteString(SkString); |
| static SkPDFUnion TextString(SkString); |
| |
| static SkPDFUnion Object(std::unique_ptr<SkPDFObject>); |
| |
| static SkPDFUnion Ref(SkPDFIndirectReference); |
| |
| /** These two non-virtual methods mirror SkPDFObject's |
| corresponding virtuals. */ |
| void emitObject(SkWStream*) const; |
| |
| bool isName() const; |
| |
| private: |
| using PDFObject = std::unique_ptr<SkPDFObject>; |
| union { |
| int32_t fIntValue; |
| bool fBoolValue; |
| SkScalar fScalarValue; |
| const char* fStaticString; |
| SkString fSkString; |
| PDFObject fObject; |
| }; |
| enum class Type : char { |
| /** It is an error to call emitObject() or addResources() on an kDestroyed object. */ |
| kDestroyed = 0, |
| kInt, |
| kColorComponent, |
| kColorComponentF, |
| kBool, |
| kScalar, |
| kName, |
| kByteString, |
| kTextString, |
| kNameSkS, |
| kByteStringSkS, |
| kTextStringSkS, |
| kObject, |
| kRef, |
| }; |
| Type fType; |
| |
| SkPDFUnion(Type, int32_t); |
| SkPDFUnion(Type, bool); |
| SkPDFUnion(Type, SkScalar); |
| SkPDFUnion(Type, const char*); |
| SkPDFUnion(Type, SkString); |
| SkPDFUnion(Type, PDFObject); |
| |
| SkPDFUnion& operator=(const SkPDFUnion&) = delete; |
| SkPDFUnion(const SkPDFUnion&) = delete; |
| }; |
| static_assert(sizeof(SkString) == sizeof(void*), "SkString_size"); |
| |
| #endif // SkPDFUnion_DEFINED |