Error on Graphics CompositingMode.SourceCopy

[Carlo \(MCP only\)]

Hi all
I need to write some strings on a Graphic surface of a simple control with a
color that is not blend with background color.
To get this, I simply need set CompositingMode to SourceCopy.
This is the code:

Dim aGraphicSurface As Graphics = CType(mObject,
Control).Parent.CreateGraphics
aGraphicSurface.CompositingMode = CompositingMode.SourceCopy
aGraphicSurface.DrawString(mCaptionText, mCaptionFont, _
New SolidBrush(mCaptionColor), _
mTextRectangle, _
mStringFormat)

The above code reises me an ArgumentException (invalid parameter) error.

I cannot understand why the error is raised.
Some additional notes:
DrawImage works correctly.
Removing aGraphicSurface.CompositingMode = CompositingMode.SourceCopy
everything works correctly.
I also tried to set different Alpha levels of mCaptionColor.
I also tried to change other Graphics setings (such as CompositionQuality,
InterpolationMode, SmoothingMode, TextRenderingHint, ecc.), without results.

Could you please help me?

Thank yuu,

Carlo

-------------------------------------------
Carlo, MCP (Windows Based Applications)
ca************@gmail.com

[Armin Zingler]

"Carlo (MCP only)" <ca************@gmail.com> schrieb

Hi all
I need to write some strings on a Graphic surface of a simple
control with a color that is not blend with background color.
To get this, I simply need set CompositingMode to SourceCopy.
This is the code:

Dim aGraphicSurface As Graphics = CType(mObject,
Control).Parent.CreateGraphics
aGraphicSurface.CompositingMode = CompositingMode.SourceCopy
aGraphicSurface.DrawString(mCaptionText, mCaptionFont, _
New SolidBrush(mCaptionColor), _
mTextRectangle, _
mStringFormat)

The above code reises me an ArgumentException (invalid parameter)
error.

I cannot understand why the error is raised.
Some additional notes:
DrawImage works correctly.
Removing aGraphicSurface.CompositingMode =
CompositingMode.SourceCopy everything works correctly.
I also tried to set different Alpha levels of mCaptionColor.
I also tried to change other Graphics setings (such as
CompositionQuality, InterpolationMode, SmoothingMode,
TextRenderingHint, ecc.), without results.

Could you please help me?

I got the same exception. After setting

aGraphicSurface.TextRenderingHint =
System.Drawing.Text.TextRenderingHint.SingleBitPer Pixel

there was no exception anymore.
Armin

[Carlo \(MCP only\)]

"Armin Zingler" <az*******@freenet.de> ha scritto nel messaggio
news:Ob**************@TK2MSFTNGP09.phx.gbl...

"Carlo (MCP only)" <ca************@gmail.com> schrieb

Hi all
I need to write some strings on a Graphic surface of a simple
control with a color that is not blend with background color.
To get this, I simply need set CompositingMode to SourceCopy.
This is the code:

Dim aGraphicSurface As Graphics = CType(mObject,
Control).Parent.CreateGraphics
aGraphicSurface.CompositingMode = CompositingMode.SourceCopy
aGraphicSurface.DrawString(mCaptionText, mCaptionFont, _
New SolidBrush(mCaptionColor), _
mTextRectangle, _
mStringFormat)

The above code reises me an ArgumentException (invalid parameter)
error.

I cannot understand why the error is raised.
Some additional notes:
DrawImage works correctly.
Removing aGraphicSurface.CompositingMode =
CompositingMode.SourceCopy everything works correctly.
I also tried to set different Alpha levels of mCaptionColor.
I also tried to change other Graphics setings (such as
CompositionQuality, InterpolationMode, SmoothingMode,
TextRenderingHint, ecc.), without results.

Could you please help me?

I got the same exception. After setting

aGraphicSurface.TextRenderingHint =
System.Drawing.Text.TextRenderingHint.SingleBitPer Pixel

there was no exception anymore.
Armin

Hello Armin

thank you very much for the suggestion. I noted, however, that setting
TextRenderingHint = TextRenderingHint.SingleBitPerPixel causes a dramatic
text quality loss. Did you solved this problem in some way?

Thnk you

Carlo

[Armin Zingler]

"Carlo (MCP only)" <ca************@gmail.com> schrieb

I got the same exception. After setting

aGraphicSurface.TextRenderingHint =
System.Drawing.Text.TextRenderingHint.SingleBitPer Pixel

there was no exception anymore.
Armin

Hello Armin

thank you very much for the suggestion. I noted, however, that
setting TextRenderingHint = TextRenderingHint.SingleBitPerPixel
causes a dramatic text quality loss. Did you solved this problem in
some way?

Yes, by adding "GridFit"
Armin