paweld/lazarus
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/lazarus/lazarus.git synced 2025-08-12 13:17:18 +02:00
Code Issues Packages Projects Releases Wiki Activity

Docs: LCL/graphutil. Updates the ScaleImg topic for changes in 412af2a7. Issue #41614.

Browse Source
This commit is contained in:
dsiders 2025-05-04 14:53:45 -04:00
parent f33db2a17a
commit ea83afdf93
1 changed files with 26 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
docs/xml/lcl/graphutil.xml
View File

@ -714,21 +714,28 @@ Scales the specified bitmap image to the required dimensions.
<descr>
<p>
<var>ScaleImg</var> is a procedure used to scale the bitmap in
<var>AImage</var> to the dimensions in <var>AWidth</var> and
<var>AWidth</var>.
<var>AImage</var> to the dimensions in <var>AWidth</var> and
<var>AHeight</var>.
</p>
<p>
No actions are performed in the routine if the image already has the dimensions
No actions are performed in the routine if AImage already has the dimensions
specified in AWidth and AHeight.
</p>
<p>
ScaleImg calls the <var>CreateIntfImage</var> method in <var>AImage</var> to
get a <var>TLazIntfImage</var> instance with the original content. A temporary
<var>TLazCanvas</var> instance is created for the source image, and its
<var>StretchDraw</var> method is called to resize and draw the interface image
on its Canvas. AImage is updated with the resized content, and its
<var>Height</var> and <var>Width</var> properties are set to the parameter
values.
ScaleImg uses the CreateIntfImage method in the bitmap image to create
TLazIntfImage instances for both the original source image and a destination
image. The destination image is configured with the new width and height. A
TLazCanvas instance is created for the scaled image and its StretchDraw method
is used to resize and draw the original image on the Canvas.
</p>
<p>
The Canvas is configured to use interpolation when both the width and height
for the scaled image are larger than the values in the original image. Pixels
generated / inserted into the destination image are an estimate of the
surrounding pixel values from the original image.
<p>
AImage is updated with the resized image content prior to exiting from the
routine.
</p>
</descr>
<seealso>
@ -739,13 +746,19 @@ values.
</seealso>
</element>
<element name="ScaleImg.AImage">
<short>Bitmap image resized in the routine.</short>
<short>
Bitmap image resized in the routine.
</short>
</element>
<element name="ScaleImg.AWidth">
<short>New width requested for the image.</short>
<short>
New width requested for the image.
</short>
</element>
<element name="ScaleImg.AHeight">
<short>New height requested for the image.</short>
<short>
New height requested for the image.
</short>
</element>
<element name="ColorRGBToHLS">