Vcl.Imaging.pngimage.TPngImage Methods

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InheritedProtected

_AddRef	protected	Increments the reference count for the interfaced object's interface.
_Release	protected	Decrements the reference count for the interfaced object's interface.
AddtEXt	public	Add a textual key-value pair to the png image metadata.
AddzTXt	public	Add a compressed textual key-value pair to the png image meta-data.
AfterConstruction	public	Obtains a reference to the Owner's interface.
Assign	public	Copies the properties and the contents of another graphical object.
AssignHandle	public	Copies the properties and the contents of a bitmap object.
AssignPNG	protected	Copies the properties and the contents of another TPngImage object.
AssignTo	public	Copies the properties and the contents of the image to another graphical object.
BeforeDestruction	public	Responds before the first destructor executes.
CanLoadFromStream	public
Changed	protected	Called when graphic has changed.
CheckDisposed	protected	This method is deprecated.
ClassInfo	public	Returns a pointer to the run-time type information (RTTI) table for the object type.
ClassName	public	Returns a string indicating the type of the object instance (as opposed to the type of the variable passed as an argument).
ClassNameIs	public	Determines whether an object is of a specific type.
ClassParent	public	Returns the type of the immediate ancestor of a class.
ClassType	public	Returns the class reference for the object's class.
CleanupInstance	public	Performs finalization on long strings, variants, and interface variables within a class.
Create	public	Creates a new instance of the TPngImage class.
CreateAlpha	public	Transforms the png image and adds alpha channel information.
CreateBlank	public	Creates a new blank instance of the TPngImage class.
DefaultHandler	public	Provides the interface for a method that processes message records.
DefineProperties	protected	Set virtual property for reading and writing graphic data stream.
Destroy	public	Frees an instance of the TPngImage class.
DisableScaledDrawer	public	Disables scaled drawer for a graphic.
Dispatch	public	Calls message-handling methods for the object, based on the contents of the Message parameter.
DisposeOf	public	DisposeOf forces the execution of the destructor code in an object.
DoSetPalette	protected	Sets the color palette of the png image.
Draw	public	Draws the png image on a canvas.
DrawPartialTrans	protected	Draws the png image on a canvas with partial transparency.
DrawTransparent	protected	Render graphic onto canvas at rectangle, blending with canvas's background.
DrawUsingPixelInformation	public	Draws the png image on a canvas considering the pixel information.
EnableScaledDrawer	public	Enables scaled drawer for a graphic
Equals	public	Compare graphic to another TGraphic object and return true if objects contain same graphic.
FieldAddress	public	Returns the address of a published object field.
Free	public	Destroys an object and frees its associated memory, if necessary.
FreeInstance	public	Deallocates memory allocated by a previous call to the NewInstance method.
GetDisposed	protected	Getter for the Disposed property.
GetEmpty	protected	Checks whether the png image is empty.
GetHashCode	public	Returns an integer containing the hash code.
GetHeader	protected	Returns the header of the png image.
GetHeight	protected	Reads the vertical size of the png image in pixels.
GetInterface	public	Retrieves a specified interface.
GetInterfaceEntry	public	Returns the entry for a specific interface implemented in a class.
GetInterfaceTable	public	Returns a pointer to a structure containing all of the interfaces implemented by a given class.
GetNamePath	public	Returns the name of the object as it appears in the Object Inspector.
GetOwner	protected	Returns the owner of an object.
GetPalette	protected	Reads the color palette of the png image.
GetPixels	protected	Returns the color of a specified pixel.
GetSupportsPartialTransparency	protected	Checks whether the png image supports partial transparency.
GetTransparent	protected	Checks whether the png image supports transparency.
GetWidth	protected	Reads the horizontal size of the png image in pixels.
HasPixelInformation	public	Checks whether the png image contains pixel information.
InheritsFrom	public	Determines the relationship of two object types.
InitializeGamma	protected	Initializes the gamma values.
InitInstance	public	Initializes a newly allocated object instance to all zeros and initializes the instance's virtual method table pointer.
InstanceSize	public	Returns the size in bytes of each instance of the object type.
LoadFromClipboardFormat	public	Loads the png image from a variable in Clipboard format.
LoadFromFile	public	Loads a graphic image stored in a file.
LoadFromResourceID	public	Loads a png image from a resource.
LoadFromResourceName	public	Loads a png image from a resource.
LoadFromStream	public	Loads a png image from a stream.
MethodAddress	public	Returns the address of a class method by name.
MethodName	public	Returns the name of a class method by address.
NewInstance	public	Allocates memory for an instance of an object type and returns a pointer to that new instance.
operator ()	public
Progress	protected	Generate OnProgress event when graphic is changing.
QualifiedClassName	public	Returns the qualified name of the class.
QueryInterface	public	Returns a reference to a specified interface if the object supports that interface.
RaiseError	public	Raises an exception.
ReadData	protected	Read graphic data from TStream.
RemoveTransparency	public
Resize	public	Resizes the png image to the new dimensions.
SafeCallException	public	Handles exceptions in methods declared using the safecall calling convention.
SaveToClipboardFormat	public	Assigns the png image to a variable in Clipboard format.
SaveToFile	public	Saves a graphics image to a file.
SaveToStream	public	Saves a png image to a stream.
SetHeight	protected	Sets the vertical size of the png image in pixels.
SetPalette	protected	Sets the color palette of the png image.
SetPixels	protected	Sets the color of a specified pixel.
SetSize	public	Specifies the size of the graphic.
SetTransparent	protected	Specify if graphic should be drawn transparently.
SetWidth	protected	Sets the horizontal size of the png image in pixels.
ToString	public	Returns a string containing the class name.
UnitName	public	Returns the name of the unit where the class is defined.
UnitScope	public	Returns the class's unit scope.
UpdateScaledDrawer	public
WriteData	protected	Write graphic data to TStream.