Vcl.Imaging.pngimage.TPngImage.CreateBlank
Delphi
constructor CreateBlank(ColorType, Bitdepth: Cardinal; cx, cy: Integer);
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| constructor | public | Vcl.Imaging.pngimage.pas | Vcl.Imaging.pngimage | TPngImage |
Description
Creates a new blank instance of the TPngImage class.
Call CreateBlank to initialize a new instance of the TPngImage class. Use the ColorType and BitDepth parameters to specify how the pixels are encoded in the image. The cx and cy parameters should contain the size of the new image.
ColorType and BitDepth work in tandem and should be as in the table below, otherwise, an exception (invalid PNG specifications) is raised.
| ColorType | BitDepth | Exception |
|---|---|---|
|
COLOR_GRAYSCALE, COLOR_RGB, COLOR_PALETTE, COLOR_GRAYSCALEALPHA, COLOR_RGBALPHA |
1, 2, 4, 8, 16 |
NO |
|
COLOR_PALETTE |
16 |
YES |
|
COLOR_RGB |
< 8 |
YES |