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Docs: LCL/graphutil. Modifies content in ScaleImg topic for changes in 77121d9b.

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* Exit ScaleImg immediately when size change for the image is not needed.
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dsiders 2024-11-05 20:30:51 +00:00
parent 77121d9b42
commit a265712f5f
1 changed files with 24 additions and 13 deletions
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37
docs/xml/lcl/graphutil.xml
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@ -708,30 +708,41 @@ Original author: Chris Rorden
</element> </element>
<element name="ScaleImg"> <element name="ScaleImg">
<short>Scales the specified image to the required dimensions.</short> <short>
Scales the specified bitmap image to the required dimensions.
</short>
<descr> <descr>
<p> <p>
<var>ScaleImg</var> is a procedure used to scale the image in <var>ScaleImg</var> is a procedure used to scale the bitmap in
<var>AImage</var> to the dimensions in <var>AWidth</var> and <var>AImage</var> to the dimensions in <var>AWidth</var> and
<var>AWidth</var>. <var>AWidth</var>.
</p> </p>
<p> <p>
No actions are performed in the routine if the image already has the dimensions
specified in AWidth and AHeight.
</p>
<p>
ScaleImg calls the <var>CreateIntfImage</var> method in <var>AImage</var> to ScaleImg calls the <var>CreateIntfImage</var> method in <var>AImage</var> to
get a <var>TLazIntfImage</var> instance with the original content. A get a <var>TLazIntfImage</var> instance with the original content. A temporary
temporary <var>TLazCanvas</var> instance is created for the source image, and <var>TLazCanvas</var> instance is created for the source image, and its
its <var>StretchDraw</var> method is called to resize and draw the interface <var>StretchDraw</var> method is called to resize and draw the interface image
image on the Canvas. AImage is updated with the resized content, and its 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 <var>Height</var> and <var>Width</var> properties are set to the parameter
values. values.
</p> </p>
</descr> </descr>
<seealso></seealso> <seealso>
<link id="#lcl.graphics.TCustomBitmap.CreateIntfImage">TCustomBitmap.CreateIntfImage</link>
<link id="#lcl.graphics.TRasterImage.LoadFromIntfImage">TRasterImage.LoadFromIntfImage</link>
<link id="#lcl.lazcanvas.TLazCanvas">TLazCanvas</link>
<link id="#lcl.intfgraphics.TLazIntfImage">TLazIntfImage</link>
</seealso>
</element> </element>
<element name="ScaleImg.AImage"> <element name="ScaleImg.AImage">
<short>Bitmap image resize in the routine.</short> <short>Bitmap image resized in the routine.</short>
</element> </element>
<element name="ScaleImg.AWidth"> <element name="ScaleImg.AWidth">
<short>New Width requested for the image.</short> <short>New width requested for the image.</short>
</element> </element>
<element name="ScaleImg.AHeight"> <element name="ScaleImg.AHeight">
<short>New height requested for the image.</short> <short>New height requested for the image.</short>
@ -739,8 +750,8 @@ values.
<element name="ColorRGBToHLS"> <element name="ColorRGBToHLS">
<short> <short>
Converts an RGB color value to Hue, Lightness, and Saturation values Converts an RGB color value to Hue, Luminance, and Saturation values.
.</short> </short>
<descr></descr> <descr></descr>
<errors/> <errors/>
<seealso></seealso> <seealso></seealso>
@ -770,10 +781,10 @@ Converts an RGB color value to Hue, Lightness, and Saturation values
<element name="ColorHLSToRGB.Hue"> <element name="ColorHLSToRGB.Hue">
<short></short> <short></short>
</element> </element>
<element name="ColorHLSToRGB.Luminance"> <element name="ColorHLSToRGB.Saturation">
<short></short> <short></short>
</element> </element>
<element name="ColorHLSToRGB.Saturation"> <element name="ColorHLSToRGB.Luminance">
<short></short> <short></short>
</element> </element>