GDI+ Font Rendering

[George-156]

Here's another question for you guys,

I read somewhere that GDI+ uses hardware accelerated font rendering (or
something along those lines). If this is correct, is it also correct
that switching to GDI+ font rendering (only) would give me a performance
boost? I seem to have a bootleneck in my font rendering pipeline.

Thanks


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[Cory Nelson]

On Sat, Mar 14, 2009 at 6:36 AM, George <georgios_vlachakis@...> wrote:
> Here's another question for you guys,
>
> I read somewhere that GDI+ uses hardware accelerated font rendering (or
> something along those lines). If this is correct, is it also correct
> that switching to GDI+ font rendering (only) would give me a performance
> boost? I seem to have a bootleneck in my font rendering pipeline.
>

Windows 7 has a new API called Direct2D that renders text in hardware.
 As far as I know, no other version of Windows has acceleration other
than .NET apps using WPF.

--
Cory Nelson

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[Stephan Assmus]

Hi,

> I read somewhere that GDI+ uses hardware accelerated font rendering (or
> something along those lines). If this is correct, is it also correct
> that switching to GDI+ font rendering (only) would give me a performance
> boost? I seem to have a bootleneck in my font rendering pipeline.

Are you already using a bitmap cache? If not, this may give you a substantial performance boost. Depends a bit on the fact whether you have transformed text or straight text only.

Best regards,
-Stephan

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[George-156]

Stephan Assmus wrote:

> Hi,
>
>  
>> I read somewhere that GDI+ uses hardware accelerated font rendering (or
>> something along those lines). If this is correct, is it also correct
>> that switching to GDI+ font rendering (only) would give me a performance
>> boost? I seem to have a bootleneck in my font rendering pipeline.
>>    
>
> Are you already using a bitmap cache? If not, this may give you a substantial performance boost. Depends a bit on the fact whether you have transformed text or straight text only.
>
> Best regards,
> -Stephan
>
> ------------------------------------------------------------------------------
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> software that enables intelligent coding and step-through debugging.
> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
>  

I am transforming text and I am using cache manager as the samples
suggest. However, I think the problem may be the fact that prior to
sending to the scanline I am doing a path_storage.concat(char_glyph) to
build up the text-string plus other things, so I will try to change my
logic. Changing it will also facilitate be being able to test GDI+
performance.


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[Petr Kobalíček]

Hi,

I readed some time document that shows that GDI+ text rendering is
slower than pure GDI text rendering. I not remember article address,
but I think that if you want really fast text renderer, use pure GDI
or write you own text blitter using SSE2.

GDI text rendering is also not too fast (it's probably implemented in
pure C without MMX/SSE).

Cheers
- Petr

2009/3/14 George <georgios_vlachakis@...>:

> Stephan Assmus wrote:
>> Hi,
>>
>>
>>> I read somewhere that GDI+ uses hardware accelerated font rendering (or
>>> something along those lines). If this is correct, is it also correct
>>> that switching to GDI+ font rendering (only) would give me a performance
>>> boost? I seem to have a bootleneck in my font rendering pipeline.
>>>
>>
>> Are you already using a bitmap cache? If not, this may give you a substantial performance boost. Depends a bit on the fact whether you have transformed text or straight text only.
>>
>> Best regards,
>> -Stephan
>>
>> ------------------------------------------------------------------------------
>> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
>> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
>> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
>> software that enables intelligent coding and step-through debugging.
>> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
>>
> I am transforming text and I am using cache manager as the samples
> suggest. However, I think the problem may be the fact that prior to
> sending to the scanline I am doing a path_storage.concat(char_glyph) to
> build up the text-string plus other things, so I will try to change my
> logic. Changing it will also facilitate be being able to test GDI+
> performance.
>
>
> ------------------------------------------------------------------------------
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> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
> software that enables intelligent coding and step-through debugging.
> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
> _______________________________________________
> Vector-agg-general mailing list
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> https://lists.sourceforge.net/lists/listinfo/vector-agg-general
>

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[Cory Nelson]

If you want speed, straight up Uniscribe is the way to go. GDI's funcs
use that under the hood.  If you use it directly, there are a few
structures you can cache to make rendering go much quicker.

On Sat, Mar 14, 2009 at 2:30 PM, Petr Kobalíček
<kobalicek.petr@...> wrote:

> Hi,
>
> I readed some time document that shows that GDI+ text rendering is
> slower than pure GDI text rendering. I not remember article address,
> but I think that if you want really fast text renderer, use pure GDI
> or write you own text blitter using SSE2.
>
> GDI text rendering is also not too fast (it's probably implemented in
> pure C without MMX/SSE).
>
> Cheers
> - Petr
>
> 2009/3/14 George <georgios_vlachakis@...>:
>> Stephan Assmus wrote:
>>> Hi,
>>>
>>>
>>>> I read somewhere that GDI+ uses hardware accelerated font rendering (or
>>>> something along those lines). If this is correct, is it also correct
>>>> that switching to GDI+ font rendering (only) would give me a performance
>>>> boost? I seem to have a bootleneck in my font rendering pipeline.
>>>>
>>>
>>> Are you already using a bitmap cache? If not, this may give you a substantial performance boost. Depends a bit on the fact whether you have transformed text or straight text only.
>>>
>>> Best regards,
>>> -Stephan
>>>
>>> ------------------------------------------------------------------------------
>>> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
>>> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
>>> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
>>> software that enables intelligent coding and step-through debugging.
>>> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
>>>
>> I am transforming text and I am using cache manager as the samples
>> suggest. However, I think the problem may be the fact that prior to
>> sending to the scanline I am doing a path_storage.concat(char_glyph) to
>> build up the text-string plus other things, so I will try to change my
>> logic. Changing it will also facilitate be being able to test GDI+
>> performance.
>>
>>
>> ------------------------------------------------------------------------------
>> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
>> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
>> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
>> software that enables intelligent coding and step-through debugging.
>> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
>> _______________________________________________
>> Vector-agg-general mailing list
>> Vector-agg-general@...
>> https://lists.sourceforge.net/lists/listinfo/vector-agg-general
>>
>
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[Pierre Joye]

hi,

On Sat, Mar 14, 2009 at 10:30 PM, Petr Kobalíček
<kobalicek.petr@...> wrote:

> I readed some time document that shows that GDI+ text rendering is
> slower than pure GDI text rendering. I not remember article address,
> but I think that if you want really fast text renderer, use pure GDI
> or write you own text blitter using SSE2.
>
> GDI text rendering is also not too fast (it's probably implemented in
> pure C without MMX/SSE).

As far as I remember, GDI+ is mostly software only, GDI has some
hardware acceleration (do not know which :).

Cheers,
--
Pierre

http://blog.thepimp.net | http://www.libgd.org

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[Petr Kobalíček]

Hi Pierre,

I think that DIBs have no hardware acceleration at all, so we can
compare software implementations ;-)

I think that blitjit will beat all of those ;-)

Cheers
- Petr

2009/3/15 Pierre Joye <pierre.php@...>:

> hi,
>
> On Sat, Mar 14, 2009 at 10:30 PM, Petr Kobalíček
> <kobalicek.petr@...> wrote:
>
>> I readed some time document that shows that GDI+ text rendering is
>> slower than pure GDI text rendering. I not remember article address,
>> but I think that if you want really fast text renderer, use pure GDI
>> or write you own text blitter using SSE2.
>>
>> GDI text rendering is also not too fast (it's probably implemented in
>> pure C without MMX/SSE).
>
> As far as I remember, GDI+ is mostly software only, GDI has some
> hardware acceleration (do not know which :).
>
> Cheers,
> --
> Pierre
>
> http://blog.thepimp.net | http://www.libgd.org
>
> ------------------------------------------------------------------------------
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[Pierre Joye]

:-))

2009/3/15 Petr Kobalíček <kobalicek.petr@...>:

> Hi Pierre,
>
> I think that DIBs have no hardware acceleration at all, so we can
> compare software implementations ;-)
>
> I think that blitjit will beat all of those ;-)
>
> Cheers
> - Petr
>
> 2009/3/15 Pierre Joye <pierre.php@...>:
>> hi,
>>
>> On Sat, Mar 14, 2009 at 10:30 PM, Petr Kobalíček
>> <kobalicek.petr@...> wrote:
>>
>>> I readed some time document that shows that GDI+ text rendering is
>>> slower than pure GDI text rendering. I not remember article address,
>>> but I think that if you want really fast text renderer, use pure GDI
>>> or write you own text blitter using SSE2.
>>>
>>> GDI text rendering is also not too fast (it's probably implemented in
>>> pure C without MMX/SSE).
>>
>> As far as I remember, GDI+ is mostly software only, GDI has some
>> hardware acceleration (do not know which :).
>>
>> Cheers,
>> --
>> Pierre
>>
>> http://blog.thepimp.net | http://www.libgd.org
>>
>> ------------------------------------------------------------------------------
>> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
>> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
>> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
>> software that enables intelligent coding and step-through debugging.
>> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
>> _______________________________________________
>> Vector-agg-general mailing list
>> Vector-agg-general@...
>> https://lists.sourceforge.net/lists/listinfo/vector-agg-general
>>
>
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>

--
Pierre

http://blog.thepimp.net | http://www.libgd.org

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[George Vlahakis]

Thanks to everyone's contribution to my original question.

Here's another font related question:

Is it possible to use gray8 adaptor and perform matrix transformations? I used to convert to curves or contour first and then matrix transform that but with the adaptor I don't see such option.



-----Original Message-----
From: Pierre Joye [mailto:pierre.php@...]
Sent: Sunday, March 15, 2009 5:20 PM
To: Anti-Grain Geometry
Subject: Re: [AGG] GDI+ Font Rendering

:-))

2009/3/15 Petr Kobalíček <kobalicek.petr@...>:

> Hi Pierre,
>
> I think that DIBs have no hardware acceleration at all, so we can
> compare software implementations ;-)
>
> I think that blitjit will beat all of those ;-)
>
> Cheers
> - Petr
>
> 2009/3/15 Pierre Joye <pierre.php@...>:
>> hi,
>>
>> On Sat, Mar 14, 2009 at 10:30 PM, Petr Kobalíček
>> <kobalicek.petr@...> wrote:
>>
>>> I readed some time document that shows that GDI+ text rendering is
>>> slower than pure GDI text rendering. I not remember article address,
>>> but I think that if you want really fast text renderer, use pure GDI
>>> or write you own text blitter using SSE2.
>>>
>>> GDI text rendering is also not too fast (it's probably implemented in
>>> pure C without MMX/SSE).
>>
>> As far as I remember, GDI+ is mostly software only, GDI has some
>> hardware acceleration (do not know which :).
>>
>> Cheers,
>> --
>> Pierre
>>
>> http://blog.thepimp.net | http://www.libgd.org
>>
>> ------------------------------------------------------------------------------
>> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
>> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
>> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
>> software that enables intelligent coding and step-through debugging.
>> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
>> _______________________________________________
>> Vector-agg-general mailing list
>> Vector-agg-general@...
>> https://lists.sourceforge.net/lists/listinfo/vector-agg-general
>>
>
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--
Pierre

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[Stephan Assmus]

George Vlahakis schrieb:
> Thanks to everyone's contribution to my original question.
>
> Here's another font related question:
>
> Is it possible to use gray8 adaptor and perform matrix transformations? I used to convert to curves or contour first and then matrix transform that but with the adaptor I don't see such option.

Essentially, this means to render transformed images, which, depending
on the given transformation, will have much lower quality than doing
vector transformations. While the existing interface was not directly
intended to work like this, since it produces coverage scanlines, it
could be possible to wrap image accessors around the data, but I am sure
this will involve some unwanted overhead. Coverage scanlines do not
contain color information, for this, you need a "span generator", for
text most likely generating a solid color. However, you would need to
combine all this to be able to wrap an image accessor around the result,
since they usually work in the same color space as the target surface.
Like I said in the beginning, quality may be greatly reduced depending
on the transformation, so I wonder if it's worth the trouble.

Best regards,
-Stephan


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[George Vlahakis]

Thanks for the reply, I think I will stick with ren_gen_outline even at the performance cost as quality is of essence.

-----Original Message-----
From: Stephan Aßmus [mailto:superstippi@...]
Sent: Tuesday, March 17, 2009 11:55 AM
To: Anti-Grain Geometry
Subject: Re: [AGG] GDI+ Font Rendering

George Vlahakis schrieb:
> Thanks to everyone's contribution to my original question.
>
> Here's another font related question:
>
> Is it possible to use gray8 adaptor and perform matrix transformations? I used to convert to curves or contour first and then matrix transform that but with the adaptor I don't see such option.

Essentially, this means to render transformed images, which, depending
on the given transformation, will have much lower quality than doing
vector transformations. While the existing interface was not directly
intended to work like this, since it produces coverage scanlines, it
could be possible to wrap image accessors around the data, but I am sure
this will involve some unwanted overhead. Coverage scanlines do not
contain color information, for this, you need a "span generator", for
text most likely generating a solid color. However, you would need to
combine all this to be able to wrap an image accessor around the result,
since they usually work in the same color space as the target surface.
Like I said in the beginning, quality may be greatly reduced depending
on the transformation, so I wonder if it's worth the trouble.

Best regards,
-Stephan


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For everybody interested in the new (Windows 7) 2D en text API, I really
recommend this video.

http://channel9.msdn.com/pdc2008/PC18/

Direct2D and DirectWrite are latest additions to the DirectX family of APIs.
Learn how you can enhance your application experience with resolution
independent, high-performance vector graphics using Direct2D. Use ClearType
and OpenType font technologies to layout beautiful text with advanced
typography within your GDI and Direct2D applications. Also learn how you can
port your GDI code to Direct2D and DirectWrite, and understand how to
interoperate with other Windows graphics A

Around 25:00 they show how bad GDIPlus renders text using subpixel
precision. It uses subpixel precision, but only when drawing, not when
calculating the start of the new character.

25:40 shows the XDirection cleartype antialiasing, and the new +Ydirection
antialiasing

27:00 shows rotating text maybe almost as beautiful as AGG :-)

78 minutes, so it is a bit long...

Regards,
Edgar


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[Pierre Arnaud]

Yes, I've watched this video a few weeks ago and it made me smile a bit.
At last, Microsoft is catching up with AGG ;-)

What they still do much better is speed : DirectWrite and Direct2D are
fully hardware accelerated and do the alpha-blending without (too much)
CPU computations.

By the way, I'd love to invest some more time into Creative Docs .NET
in order to improve a bit the font rendering... but it'll have to wait,
since I don't have much time left for programming for fun.

Pierre

> For everybody interested in the new (Windows 7) 2D en text API, I
> really recommend this video.
>
> http://channel9.msdn.com/pdc2008/PC18/
>
> [...]
>
> 27:00 shows rotating text maybe almost as beautiful as AGG :-)
>
> 78 minutes, so it is a bit long...
>
> Regards,
> Edgar

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[George Vlahakis]

Hi all,

This should be a quick one (I hope).

I am currently rendering to a HDC :

pixmap->blend(hdc,0,0)

and then saving to a PNG from that HDC. I works fine however, when
saving to a file I would like to keep transparency (which is lost when
rendering to the HDC).
 
Do you have any suggestions as to how to bitblt to a windows HBITMAP (in
memory) with transparency?

Thanks

George


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I think you are looking for this ?
http://msdn.microsoft.com/en-us/library/aa452850.aspx

Or you could use something like GetDIBbits,
or just render to a RGBA in memorybuffer, and use that as source for the
png.

Edgar


----- Original Message -----
From: "George Vlahakis" <g.vlahakis@...>
To: "Anti-Grain Geometry" <vector-agg-general@...>
Sent: Tuesday, June 23, 2009 19:19
Subject: [AGG] Preserving transparency in windows

> Hi all,
>
> This should be a quick one (I hope).
>
> I am currently rendering to a HDC :
>
> pixmap->blend(hdc,0,0)
>
> and then saving to a PNG from that HDC. I works fine however, when
> saving to a file I would like to keep transparency (which is lost when
> rendering to the HDC).
>
> Do you have any suggestions as to how to bitblt to a windows HBITMAP (in
> memory) with transparency?
>
> Thanks
>
> George
>
>
> ------------------------------------------------------------------------------
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> Vector-agg-general mailing list
> Vector-agg-general@...
> https://lists.sourceforge.net/lists/listinfo/vector-agg-general 

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[George Vlahakis]

Thanks for that. I think the pure_api example might do it... it is even documented! ;-)

---

From: Edgar 't Hart @ GMail [mailto:edgar.t.hart@...]
Sent: Wed 6/24/2009 00:02
To: Anti-Grain Geometry
Subject: Re: [AGG] Preserving transparency in windows

I think you are looking for this ?
http://msdn.microsoft.com/en-us/library/aa452850.aspx

Or you could use something like GetDIBbits,
or just render to a RGBA in memorybuffer, and use that as source for the
png.

Edgar


----- Original Message -----
From: "George Vlahakis" <g.vlahakis@...>
To: "Anti-Grain Geometry" <vector-agg-general@...>
Sent: Tuesday, June 23, 2009 19:19
Subject: [AGG] Preserving transparency in windows

> Hi all,
>
> This should be a quick one (I hope).
>
> I am currently rendering to a HDC :
>
> pixmap->blend(hdc,0,0)
>
> and then saving to a PNG from that HDC. I works fine however, when
> saving to a file I would like to keep transparency (which is lost when
> rendering to the HDC).
>
> Do you have any suggestions as to how to bitblt to a windows HBITMAP (in
> memory) with transparency?
>
> Thanks
>
> George
>
>
> ------------------------------------------------------------------------------
> _______________________________________________
> Vector-agg-general mailing list
> Vector-agg-general@...
> https://lists.sourceforge.net/lists/listinfo/vector-agg-general

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[Pierre Arnaud]

I would not go through the HDC rendering but would rather stay with
the raw pixel buffer in memory, then use a library such as libpng to
encode and save the file to disk.

> From: George Vlahakis [mailto:g.vlahakis@...]
[...]

>
> I am currently rendering to a HDC :
>
> pixmap->blend(hdc,0,0)
>
> and then saving to a PNG from that HDC. I works fine however, when
> saving to a file I would like to keep transparency (which is lost when
> rendering to the HDC).
>
> Do you have any suggestions as to how to bitblt to a windows HBITMAP
> (in memory) with transparency?

[...]



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[George Vlahakis]

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Actually it’s a requirement to be able to send back to a .NET framework app the transparent bmp.

 

Here is the code I am testing on and I can't shake those outline dots ...

 

    int width = 320;

    int height = 240;

    //Also tried adding System::Drawing::Imaging::PixelFormat::Format32bppPArgb

    System::Drawing::Bitmap^ gdiBMP = gcnew System::Drawing::Bitmap(width, height);

    System::Drawing::Graphics^ g = System::Drawing::Graphics::FromImage(gdiBMP);

    IntPtr hdcPtr = g->GetHdc();

    HDC hdc = (HDC)hdcPtr.ToPointer();

 

    //Creating compatible DC and a bitmap to render the image

    BITMAPINFO bmp_info;

    bmp_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

    bmp_info.bmiHeader.biWidth = width;

    bmp_info.bmiHeader.biHeight = height;

    bmp_info.bmiHeader.biPlanes = 1;

    bmp_info.bmiHeader.biBitCount = 32;

    bmp_info.bmiHeader.biCompression = BI_RGB;

    bmp_info.bmiHeader.biSizeImage = 0;

    bmp_info.bmiHeader.biXPelsPerMeter = 0;

    bmp_info.bmiHeader.biYPelsPerMeter = 0;

    bmp_info.bmiHeader.biClrUsed = 0;

    bmp_info.bmiHeader.biClrImportant = 0;

 

    HDC mem_dc = ::CreateCompatibleDC(hdc);

 

    void* buf = 0;

 

    HBITMAP bmp = ::CreateDIBSection(

        mem_dc,

        &bmp_info,

        DIB_RGB_COLORS,

        &buf,

        0,

        0

    );

 

    // Selecting the object before doing anything allows you

    // to use AGG together with native Windows GDI.

    HBITMAP temp = (HBITMAP)::SelectObject(mem_dc, bmp);

 

 

    //============================================================

    // AGG lowest level code.

    agg::rendering_buffer rbuf;

    rbuf.attach((unsigned char*)buf, width, height, -width*4); // Use negative stride in order

                               // to keep Y-axis consistent with

                               // WinGDI, i.e., going down.

 

    // Pixel format and basic primitives renderer

    // also tried bgra32_pre

    agg::pixfmt_bgra32 pixf(rbuf);  

    agg::renderer_base<agg::pixfmt_bgra32> renb(pixf);

 

    //renb.clear(agg::rgba8(255, 255, 255, 255));

    renb.clear(agg::rgba8(0, 0, 0, 0));

 

    // Scanline renderer for solid filling.

    agg::renderer_scanline_aa_solid<agg::renderer_base<agg::pixfmt_bgra32> > ren(renb);

 

    // Rasterizer & scanline

    agg::rasterizer_scanline_aa<> ras;

    agg::scanline_p8 sl;

 

    // Polygon (triangle)

    ras.move_to_d(20.7, 34.15);

    ras.line_to_d(398.23, 123.43);

    ras.line_to_d(165.45, 401.87);

 

    // Setting the attrribute (color) & Rendering

    //ren.color(agg::rgba8(80, 90, 60));

    ren.color(agg::rgba8(255, 255, 255));

    agg::render_scanlines(ras, sl, ren);

    //============================================================

    // demulpitplying helps a lot but still leaves black dots around

    // the shape

    pixf.demultiply();

 

    //------------------------------------------------------------

    // Display the image. If the image is B-G-R-A (32-bits per pixel)

    // one can use AlphaBlend instead of BitBlt. In case of AlphaBlend

    // one also should clear the image with zero alpha, i.e. rgba8(0,0,0,0)

 

    BLENDFUNCTION ftn;

                        ftn.BlendOp = AC_SRC_OVER;

                        ftn.BlendFlags = 0;

                        ftn.SourceConstantAlpha = 255;

                        ftn.AlphaFormat = AC_SRC_ALPHA;

 

    ::AlphaBlend( hdc, 0, 0, width, height, mem_dc, 0,0,width, height, ftn);

 

    // Free resources

    ::SelectObject(mem_dc, temp);

   

    ::DeleteObject(bmp);

    ::DeleteObject(mem_dc);

 

    g->ReleaseHdc(hdcPtr);

    g->Flush();

    delete g;

 

    gdiBMP->Save("test2.png", System::Drawing::Imaging::ImageFormat::Png);

 

 

-----Original Message-----
From: Pierre Arnaud [mailto:pierre.arnaud@...]
Sent: Wednesday, June 24, 2009 4:11 PM
To: 'Anti-Grain Geometry'
Subject: Re: [AGG] Preserving transparency in windows

 

I would not go through the HDC rendering but would rather stay with

the raw pixel buffer in memory, then use a library such as libpng to

encode and save the file to disk.

 

> From: George Vlahakis [mailto:g.vlahakis@...]

[...]

>

> I am currently rendering to a HDC :

>

> pixmap->blend(hdc,0,0)

>

> and then saving to a PNG from that HDC. I works fine however, when

> saving to a file I would like to keep transparency (which is lost when

> rendering to the HDC).

>

> Do you have any suggestions as to how to bitblt to a windows HBITMAP

> (in memory) with transparency?

[...]

 

 

 

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[Pierre Arnaud]

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Well, if I get you right, what you want is paint with AGG into the System.Drawing.Bitmap object ?

I'd not use the complicated Graphics/HDC/Compatible DC/etc. stuff, but simply use (in C# syntax) something like that :

 

Rectangle rect = new Rectangle(0, 0, gdiBMP.Width, gdiBMP.Height);

BitmapData bmpData = gdiBMP.LockBits(rect, ImageLockMode.ReadWrite, gdiBMP.PixelFormat);

 

bmpData.Scan0 contains the pointer to the first scan line (i.e. use it directly with the AGG rendering buffer) and bmpData.Stride contains the width in bytes for a given line.

 

When you are finished filling the buffer with AGG, simply UnlockBits and you should be done.

 

Pierre

 

 

From: George Vlahakis [mailto:g.vlahakis@...]
Sent: Wednesday, June 24, 2009 4:14 PM
To: Anti-Grain Geometry
Subject: Re: [AGG] Preserving transparency in windows

 

Actually it’s a requirement to be able to send back to a .NET framework app the transparent bmp.

 

Here is the code I am testing on and I can't shake those outline dots ...

 

    int width = 320;

    int height = 240;

    //Also tried adding System::Drawing::Imaging::PixelFormat::Format32bppPArgb

    System::Drawing::Bitmap^ gdiBMP = gcnew System::Drawing::Bitmap(width, height);

    System::Drawing::Graphics^ g = System::Drawing::Graphics::FromImage(gdiBMP);

    IntPtr hdcPtr = g->GetHdc();

    HDC hdc = (HDC)hdcPtr.ToPointer();

 

[...]

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