PngExtendedParams Object (IPngExtendedParams Interface)
This object provides functionality for tuning the parameters of saving a black-and-white image to PNG format (IFF_Png format) using the IImage::WriteToFile method. A pointer to this object is passed into the IImage::WriteToFile method as an input parameter, and thus affects the properties of the resulting image. All properties of a newly created object of this type are set to reasonable defaults. See the description of particular property for its default value.
The PngExtendedParams object is a persistent object. This means that the object's current state can be written to persistent storage on disk. Later, the object can be re-created by reading the object's state from persistent storage. The following methods provide persistence of the object: SaveToFile, and LoadFromFile.
Properties
| Name | Type | Description |
|---|---|---|
| Application | Engine, read-only | Returns the Engine object. |
| TransparentColor | int |
Sets the color which must be replaced by transparent areas when saving the image in PNG format. Only black and white colors are currently supported.
The default value of this property is -1, which means that no colors will be replaced with transparency. |
Methods
| Name | Description |
|---|---|
| CopyFrom | Initializes properties of the current object with values of similar properties of another object. |
| LoadFromFile | Restores the object contents from a file on disk. |
| SaveToFile | Saves the object contents into a file on disk. |
Output parameter
This object is the output parameter of the CreatePngExtendedParams method of the Engine object.
Input parameter
This object is the input parameter of the WriteToFile method of the Image object.
See also
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