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EngineProgrammer

drawing in Win32

4 posts in this topic

Hey everyone,
I'm just having some fun with reinventing many wheels. [img]http://public.gamedev.net//public/style_emoticons/default/laugh.png[/img]
I just love to understand the low level programming!

So here is what I want to do: basically I want to make my own pixel drawing system.
I want to create a pixel class which stores a color. After I make an array of [640][480] which will be my "screen".
When I gave all pixels a color I want to draw every pixel on the screen.

How can I draw all pixels on the screen? SetPixel is a very slow method so I want to avoid that.
Is it possible to directly connect my pixels to the screen pixels?
How does the GDI communicate with the screen pixels?
How can I communicate with the screen pixels without using the GDI or SetPixel? Is it even possible?


Kind regards,
Jonathan
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Copying over this data by yourself would require you to write to video memory yourself, which is a no-go.

Just use GDI or a library like D2D to get your image rendered.
GDI should provide functions to blit bitmaps to the screen, so there's no messing with pixels individually.
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CreateDIBSection with BitBlt/StretchDIBits/SetDIBitsToDevice is the fastest method as i know. Here: [url="http://sol.gfxile.net/wintut/ch3.html"]http://sol.gfxile.net/wintut/ch3.html[/url] you can find a great tutorial for it.
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[quote name='EngineProgrammer' timestamp='1354958425' post='5008447']
How can I communicate with the screen pixels without using the GDI or SetPixel? Is it even possible?
[/quote]

This is fundamentally impossible in win32. In fact that's why api's like GDI and Directx were invented.

History lesson:

DOS allowed a programmer direct access to all hardware on your machine, when windows 95 came along it used [url="http://en.wikipedia.org/wiki/Protected_mode"]protected mode[/url] so as a result programmers could not directly write to the video memory. Microsoft then devised a solution to this problem and came up with api's like DirectDraw and GDI.
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What [b]sk8beast[/b] said. This was my first experiment with software rendering: https://www.dropbox.com/s/eal3z9ypngftw1b/ssr.zip
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