GDI+ Font Rendering

[George Vlahakis]

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Never thought of that!

 

Have you tested it?

Are you suggesting to set the agg rendering buffer to Scan0 ?

Can you possibly extend your sample code a bit further?

 

 

Either way, many thanks !

 

I will try it and let you know.

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From: Pierre Arnaud [mailto:pierre.arnaud@...]
Sent: Wed 6/24/2009 22:39
To: 'Anti-Grain Geometry'
Subject: Re: [AGG] Preserving transparency in windows

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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[George Vlahakis]

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Ok!

 

Many many thanks to Pierre for on the spot and prompt reply!

 

After a littlebit of testing here's the code that actually produces a .NET png file :

int width = 320;
int height = 240;
// Create the gdi+ bitmap
Bitmap^ gdiBMP = gcnew Bitmap(width, height, PixelFormat::Format32bppPArgb);
// Notice that the pixel format is 32 bit premultiplied to match pixf_type below. Couldn't get
// this to work if both weren't pre multiplied
BitmapData^ bmpData = gdiBMP->LockBits(System::Drawing::Rectangle(0,0,width,height),ImageLockMode::ReadWrite, PixelFormat::Format32bppPArgb);
// Get pointer to bmp data buffer
void* scan0 = bmpData->Scan0.ToPointer();
// AGG lowest level code.
agg::rendering_buffer rbuf;
// Use stride of your liking (negative/positive)
rbuf.attach((unsigned char*) scan0, width, height, -bmpData->Stride);
// Pixel format and basic primitives renderer
typedef agg::pixfmt_bgra32_pre pixf_type;
pixf_type pixf(rbuf);
agg::renderer_base<pixf_type> renb(pixf);
renb.clear(agg::rgba8_pre(0, 0, 0, 0));
// Scanline renderer for solid filling.
agg::renderer_scanline_aa_solid<agg::renderer_base<pixf_type> > 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_pre(255, 255, 255));
agg::render_scanlines(ras, sl, ren);
// Simple now
gdiBMP->UnlockBits(bmpData);
gdiBMP->Save("test.png", ImageFormat::Png);

 

---

From: Pierre Arnaud [mailto:pierre.arnaud@...]
Sent: Wed 6/24/2009 22:39
To: 'Anti-Grain Geometry'
Subject: Re: [AGG] Preserving transparency in windows

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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[pierre.arnaud]

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Great, you managed to get it to work. Yes, I am using this approach myself in Creative Docs .NET, whenever I need to paint into a .NET managed bitmap.

 

Thank you in the name of the other .NET users who have not yet a working code for you complete sample :-)

 

 

From: George Vlahakis [mailto:g.vlahakis@...]
Sent: Thursday, June 25, 2009 12:07 AM
To: Anti-Grain Geometry; Anti-Grain Geometry
Subject: Re: [AGG] Preserving transparency in windows

 

Ok!

 

Many many thanks to Pierre for on the spot and prompt reply!

 

After a littlebit of testing here's the code that actually produces a .NET png file :

int width = 320;
int height = 240;
// Create the gdi+ bitmap
Bitmap^ gdiBMP = gcnew Bitmap(width, height, PixelFormat::Format32bppPArgb);
// Notice that the pixel format is 32 bit premultiplied to match pixf_type below. Couldn't get
// this to work if both weren't pre multiplied
BitmapData^ bmpData = gdiBMP->LockBits(System::Drawing::Rectangle(0,0,width,height),ImageLockMode::ReadWrite, PixelFormat::Format32bppPArgb);
// Get pointer to bmp data buffer
void* scan0 = bmpData->Scan0.ToPointer();
// AGG lowest level code.
agg::rendering_buffer rbuf;
// Use stride of your liking (negative/positive)
rbuf.attach((unsigned char*) scan0, width, height, -bmpData->Stride);
// Pixel format and basic primitives renderer
typedef agg::pixfmt_bgra32_pre pixf_type;
pixf_type pixf(rbuf);
agg::renderer_base<pixf_type> renb(pixf);
renb.clear(agg::rgba8_pre(0, 0, 0, 0));
// Scanline renderer for solid filling.
agg::renderer_scanline_aa_solid<agg::renderer_base<pixf_type> > 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_pre(255, 255, 255));
agg::render_scanlines(ras, sl, ren);
// Simple now
gdiBMP->UnlockBits(bmpData);
gdiBMP->Save("test.png", ImageFormat::Png);

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