org.mabb.fontverter.opentype.TtfInstructions

Class TtfVirtualMachine

java.lang.Object

org.mabb.fontverter.opentype.TtfInstructions.TtfVirtualMachine

All Implemented Interfaces:

TtfInstructionVisitor

public class TtfVirtualMachine
extends Object
implements TtfInstructionVisitor

This is our interpreter for TTF outline hint programs. Current purpose is for figuring out and fixing older TTF fonts that don't render in some browsers correctly rather than actual font rasterization

Currently can handle all stack and control operations but only like 15% of the graphics state related instructions

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TtfVirtualMachine.TtfVmRuntimeException

Field Summary

Fields

Modifier and Type	Field and Description
int	jumpOffset

Constructor Summary

Constructors

Constructor and Description
TtfVirtualMachine(OpenTypeFont font)

Method Summary

Modifier and Type	Method and Description
void	execute(List<TtfInstruction> instructions)
void	execute(TtfInstruction instruction)
OpenTypeFont	getFont()
TtfFunction	getFunction(Integer function)
TtfGraphicsState	getGraphicsState()
Integer	getLoopVar()
Long	getStorageAreaValue(Long index)
void	setLoopVar(Integer loopVar)
void	setStorageAreaValue(Long index, Long value)
boolean	shouldExecuteBranch()
void	visit(ElseInstruction instruction)
void	visit(EndFunctionInstruction instruction)
void	visit(EndIfInstruction instruction)
void	visit(FunctionDefInstruction instruction)
void	visit(IfInstruction instruction)
void	visitGeneric(TtfInstruction instruction)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

jumpOffset

public int jumpOffset

Constructor Detail

TtfVirtualMachine

public TtfVirtualMachine(OpenTypeFont font)

Method Detail

execute

public void execute(List<TtfInstruction> instructions)
             throws IOException

Throws:

IOException

execute

public void execute(TtfInstruction instruction)
             throws IOException

Throws:

IOException

visitGeneric

public void visitGeneric(TtfInstruction instruction)
                  throws IOException

Specified by:

visitGeneric in interface TtfInstructionVisitor

Throws:

IOException

visit

public void visit(IfInstruction instruction)
           throws IOException

Specified by:

visit in interface TtfInstructionVisitor

Throws:

IOException

visit

public void visit(ElseInstruction instruction)
           throws IOException

Specified by:

visit in interface TtfInstructionVisitor

Throws:

IOException

visit

public void visit(EndIfInstruction instruction)
           throws IOException

Specified by:

visit in interface TtfInstructionVisitor

Throws:

IOException

visit

public void visit(FunctionDefInstruction instruction)
           throws IOException

Specified by:

visit in interface TtfInstructionVisitor

Throws:

IOException

visit

public void visit(EndFunctionInstruction instruction)
           throws IOException

Specified by:

visit in interface TtfInstructionVisitor

Throws:

IOException

shouldExecuteBranch

public boolean shouldExecuteBranch()

getFunction

public TtfFunction getFunction(Integer function)

getFont

public OpenTypeFont getFont()

getGraphicsState

public TtfGraphicsState getGraphicsState()

getStorageAreaValue

public Long getStorageAreaValue(Long index)

setStorageAreaValue

public void setStorageAreaValue(Long index,
                                Long value)

setLoopVar

public void setLoopVar(Integer loopVar)

getLoopVar

public Integer getLoopVar()