ImageEn, unit iexBitmaps

TIEBitmap.SwitchTo

TIEBitmap.SwitchTo


Declaration

procedure SwitchTo(Target: TIEBitmap);


Description

Assigns the current image to the target object. The source object will then be empty.
Executes more quickly than a copy operation because the image is transferred rather than copied.
In detail, it assigns all fields to Target, and set to zero all parameters (do not free the image or allocated memory).


Example

var
  iebmp1, iebmp2: TIEBitmap;
begin
  iebmp1 := TIEBitmap.create;
  iebmp2 := TIEBitmap.create;
  iebmp1.Read( 'D:\image.jpeg' );
  iebmp1.SwitchTo( iebmp2 );
  // iebmp1 is now nil
  iebmp2.Write( 'D:\image2.jpeg' );
  iebmp2.Free;


TIEBitmap Assignment and Drawing Methods

TIEBitmap Methods
Method Mode Notes
Assign From TIEBitmap/TBitmap/TGraphic/TIcon Copy whole image
AssignImage From TIEBitmap Like assign, but does not copy the alpha channel
AssignRect From TIEBitmap/TBitmap Copy a specified rect
CopyAndConvertFormat From TIEBitmap Copy whole image
CopyRectTo To TIEBitmap Copy rect to another image (without scaling)
CopyWithMask1 To TIEBitmap Copy image using a mask to specify what is copied from the source
CopyWithMask2 To TIEBitmap Copy image using a mask to specify what is replaced in the destintation
DrawToTIEBitmap To TIEBitmap Copies all or part of the image to a specified position and/or size
MergeAlphaRectTo With TIEBitmap Merges all or part of two TIEBitmaps with alpha channels to a specified position using merge rules
MergeWithAlpha With TIEBitmap Merges all or part of two TIEBitmaps with alpha channels to a specified position
RenderToTIEBitmapEx To TIEBitmap Extended drawing of content to a TIEBitmap
StretchRectTo To TIEBitmap Copy rect to dest rect in another image (with scaling)
SwitchTo To TIEBitmap Move content from one TIEBitmap to another

TBitmap Methods
Method Mode Notes
Assign From TIEBitmap/TBitmap/TGraphic/TIcon Copy whole image
AssignRect From TIEBitmap/TBitmap Copy a specified rect
CopyFromTBitmap From TBitmap Copy whole image
CopyToTBitmap To TBitmap Copy whole image
RenderToTBitmapEx To TBitmap Extended drawing of content to a TBitmap

TCanvas Methods
Method Mode Notes
DrawToCanvas To TCanvas Copies whole image to canvas at specified position (ignoring the alpha channel)
DrawToCanvasWithAlpha To TCanvas Copies whole image to canvas at specified position (honoring the alpha channel)
RenderToCanvas To TCanvas Extended drawing of content to a TCanvas (ignoring the alpha channel)
RenderToCanvasWithAlpha To TCanvas Extended drawing of content to a TCanvas (honoring the alpha channel)