On Tue, Mar 18, 2008 at 12:30 PM, sturlamolden <[EMAIL PROTECTED]> wrote:
> On 18 Mar, 17:48, Miki <[EMAIL PROTECTED]> wrote:
>
> > Apart from PIL, some other options are:
> > 1. Most GUI frameworks (wxPython, PyQT, ...) give you a canvas object
> > you can draw on
>
> Yes, but at least on Windows you will get a GDI canvas. GDI is slow.
Of all the major platforms, GDI is probably the fastest for basic
pixel-level interaction with the screen. I have no idea why you think
it's slow.
>
>
>
> > 2. A bit of an overkill, but you can use PyOpenGL
>
> OpenGL gives you a fast 'bitblit' for drawing bitmaps to the fram
> buffer (much faster than GDI). Here is some C code that does that (8-
> bit color depth). Translating to Python is trivial. I prefer not to
> use PyOpenGL as it has some unwanted overhead. It is better to use
> ctypes.
>
>
> void bitblt(void *frame, int w, int h)
> {
> glViewport(0,0,w,h);
> glClearColor(0.0, 0.0, 0.0, 0.0);
> glClear(GL_COLOR_BUFFER_BIT);
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> gluOrtho2D(0.0, (GLfloat)w, 0.0, (GLfloat)h);
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();
> glRasterPos2i(0,0);
> glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
> glDrawPixels(w, h, GL_RGB, GL_UNSIGNED_BYTE_3_3_2, (GLvoid *)frame);
> glFlush();
>
>
> }
>
OpenGL is totally unsuitable if the goal is to implement your own
pixel-level raster drawing.
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