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Bug 1 - GDI+, speed penalty due to transparent Bitmap folder icons.
Summary: GDI+, speed penalty due to transparent Bitmap folder icons.
Status: CONFIRMED
Alias: None
Product: VCL TeeChart
Classification: Unclassified
Component: TTree (show other bugs)
Version: unspecified
Hardware: PC Windows
: --- enhancement
Target Milestone: ---
Assignee: Steema Issue Manager
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-09-20 13:48 EDT by david berneda
Modified: 2013-09-20 13:48 EDT (History)
0 users

See Also:
Chart Series: ---
Delphi / C++ Builder RAD IDE Version:

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Description david berneda 2013-09-20 13:48:59 EDT 
Default TTree icons are *.bmp resources that have to be adapted, applying transparency so the Tree background is visible under the icon.

VCL GDI does this automatically (Bitmap.Transparent:=True), but when using GDI+, this process must be done each time the icon is painted, instead of doing this once the icon is loaded from the resource.

The speed difference is quite high.

One solution will be maintaining two sets of icons, one for GDI and another for GDI+ in PNG format with Alpha transparency.

Alpha PNG pictures would not need this conversion and should paint equally fast in GDI+