#include <SkSLConstructorMatrixResize.h>

Inheritance diagram for SkSL::ConstructorMatrixResize:

Public Member Functions
	ConstructorMatrixResize (Position pos, const Type &type, std::unique_ptr< Expression > arg)

std::unique_ptr< Expression >	clone (Position pos) const override

bool	supportsConstantValues () const override

std::optional< double >	getConstantValue (int n) const override

Public Member Functions inherited from SkSL::SingleArgumentConstructor
	SingleArgumentConstructor (Position pos, Kind kind, const Type *type, std::unique_ptr< Expression > argument)

std::unique_ptr< Expression > &	argument ()

const std::unique_ptr< Expression > &	argument () const

SkSpan< std::unique_ptr< Expression > >	argumentSpan () final

SkSpan< const std::unique_ptr< Expression > >	argumentSpan () const final

Public Member Functions inherited from SkSL::AnyConstructor
	AnyConstructor (Position pos, Kind kind, const Type *type)

virtual SkSpan< std::unique_ptr< Expression > >	argumentSpan ()=0

virtual SkSpan< const std::unique_ptr< Expression > >	argumentSpan () const =0

std::string	description (OperatorPrecedence) const override

const Type &	componentType () const

bool	supportsConstantValues () const override

std::optional< double >	getConstantValue (int n) const override

ComparisonResult	compareConstant (const Expression &other) const override

Public Member Functions inherited from SkSL::Expression
	Expression (Position pos, Kind kind, const Type *type)

Kind	kind () const

const Type &	type () const

bool	isAnyConstructor () const

bool	isIntLiteral () const

bool	isFloatLiteral () const

bool	isBoolLiteral () const

AnyConstructor &	asAnyConstructor ()

const AnyConstructor &	asAnyConstructor () const

bool	isIncomplete (const Context &context) const

virtual ComparisonResult	compareConstant (const Expression &other) const

CoercionCost	coercionCost (const Type &target) const

virtual bool	supportsConstantValues () const

virtual std::optional< double >	getConstantValue (int n) const

virtual std::unique_ptr< Expression >	clone (Position pos) const =0

std::unique_ptr< Expression >	clone () const

std::string	description () const final

virtual std::string	description (OperatorPrecedence parentPrecedence) const =0

Public Member Functions inherited from SkSL::IRNode
virtual	~IRNode ()

virtual std::string	description () const =0

	IRNode (const IRNode &)=delete

IRNode &	operator= (const IRNode &)=delete

Position	position () const

void	setPosition (Position p)

template<typename T >
bool	is () const

template<typename T >
const T &	as () const

template<typename T >
T &	as ()

Static Public Member Functions
static std::unique_ptr< Expression >	Make (const Context &context, Position pos, const Type &type, std::unique_ptr< Expression > arg)

Static Public Member Functions inherited from SkSL::Poolable
static void *	operator new (const size_t size)

static void	operator delete (void *ptr)

Static Public Attributes
static constexpr Kind	kIRNodeKind = Kind::kConstructorMatrixResize

Additional Inherited Members
Public Types inherited from SkSL::Expression
enum class	ComparisonResult { kUnknown = -1 , kNotEqual , kEqual }

using	Kind = ExpressionKind

Public Attributes inherited from SkSL::IRNode
Position	fPosition

Protected Member Functions inherited from SkSL::IRNode
	IRNode (Position position, int kind)

Protected Attributes inherited from SkSL::IRNode
int	fKind

Detailed Description

Represents the construction of a matrix resize operation, such as mat4x4(myMat2x2).

These always contain exactly 1 matrix of non-matching size. Cells that aren't present in the input matrix are populated with the identity matrix.

Definition at line 31 of file SkSLConstructorMatrixResize.h.

Constructor & Destructor Documentation

◆ ConstructorMatrixResize()

SkSL::ConstructorMatrixResize::ConstructorMatrixResize	(	Position	pos,
		const Type &	type,
		std::unique_ptr< Expression >	arg
	)

inline

Definition at line 35 of file SkSLConstructorMatrixResize.h.

36 : INHERITED(pos, kIRNodeKind, &type, std::move(arg)) {}

pos

SkPoint pos

Definition: ImageShaderTest.cpp:27

SkSL::ConstructorMatrixResize::kIRNodeKind

static constexpr Kind kIRNodeKind

Definition: SkSLConstructorMatrixResize.h:33

SkSL::Expression::type

const Type & type() const

Definition: SkSLExpression.h:44

Member Function Documentation

◆ clone()

std::unique_ptr< Expression > SkSL::ConstructorMatrixResize::clone ( Position pos ) const

inlineoverridevirtual

Implements SkSL::Expression.

Definition at line 43 of file SkSLConstructorMatrixResize.h.

                                                                 {
        return std::make_unique<ConstructorMatrixResize>(pos, this->type(), argument()->clone());
    }

◆ getConstantValue()

std::optional< double > SkSL::ConstructorMatrixResize::getConstantValue ( int n ) const

overridevirtual

Returns the n'th compile-time constant value within a literal or constructor. Use Type::slotCount to determine the number of slots within an expression. Slots which do not contain compile-time constant values will return nullopt. vec4(1, vec2(2), 3) contains four compile-time constants: (1, 2, 2, 3) mat2(f) contains four slots, and two are constant: (nullopt, 0, 0, nullopt) All classes which override this function must also implement supportsConstantValues.

Reimplemented from SkSL::AnyConstructor.

Definition at line 31 of file SkSLConstructorMatrixResize.cpp.

                                                                         {
    int rows = this->type().rows();
    int row = n % rows;
    int col = n / rows;
 
    SkASSERT(col >= 0);
    SkASSERT(row >= 0);
    SkASSERT(col < this->type().columns());
    SkASSERT(row < this->type().rows());
 
    // GLSL resize matrices are of the form:
    //  |m m 0|
    //  |m m 0|
    //  |0 0 1|
    // Where `m` is the matrix being wrapped, and other cells contain the identity matrix.
 
    // Forward `getConstantValue` to the wrapped matrix if the position is in its bounds.
    if (col < this->argument()->type().columns() && row < this->argument()->type().rows()) {
        // Recalculate `n` in terms of the inner matrix's dimensions.
        n = row + (col * this->argument()->type().rows());
        return this->argument()->getConstantValue(n);
    }
 
    // Synthesize an identity matrix for out-of-bounds positions.
    return (col == row) ? 1.0 : 0.0;
}

◆ Make()

std::unique_ptr< Expression > SkSL::ConstructorMatrixResize::Make	(	const Context &	context,
		Position	pos,
		const Type &	type,
		std::unique_ptr< Expression >	arg
	)

static

Definition at line 15 of file SkSLConstructorMatrixResize.cpp.

                                                                                         {
    SkASSERT(type.isMatrix());
    SkASSERT(type.isAllowedInES2(context));
    SkASSERT(arg->type().componentType().matches(type.componentType()));
 
    // If the matrix isn't actually changing size, return it as-is.
    if (type.rows() == arg->type().rows() && type.columns() == arg->type().columns()) {
        return arg;
    }
 
    return std::make_unique<ConstructorMatrixResize>(pos, type, std::move(arg));
}

◆ supportsConstantValues()

bool SkSL::ConstructorMatrixResize::supportsConstantValues ( ) const

inlineoverridevirtual

Returns true if this expression type supports getConstantValue. (This particular expression may or may not actually contain a constant value.) It's harmless to call getConstantValue on expressions which don't support constant values or don't contain any constant values, but if supportsConstantValues returns false, you can assume that getConstantValue will return nullopt for every slot of this expression. This allows for early-out opportunities in some cases. (Some expressions have tons of slots but never hold a constant value; e.g. a variable holding a very large array.)

Reimplemented from SkSL::AnyConstructor.

Definition at line 47 of file SkSLConstructorMatrixResize.h.

47{ return true; }