fast way to get and set pixel color in pygame

Question

I am working on a simple project using pygame and I need to get and set pixel colors. Using pygame.get_at(()) and pygame.set_at(()) is VERY slow.

So I tried using PixelArray to get and set the colors manually. But this still is VERY slow

Is there a much faster way to do this?

Is it possible to make a funtion to get and set a pixel in c++ so it would be faster or is there a way in python/pygame to do it?

For example:

a c++ function that returns the pixel color at a given coordinate and another function that sets the pixel at a given coordinate to a given color.

Then I could call these functions in pygame somehow.

Thank you very much.

correct (if its the fastest way to solve my problem). I need a fast way to get and set pixel colors on a pygame screen — arny berns, Dec 30 '14 at 18:41
this will help - http://stackoverflow.com/questions/4241415/import-c-function-into-python-program — Irrational Person, Dec 30 '14 at 18:43
yes but only basically. Never have I done any graphics with it — arny berns, Dec 30 '14 at 18:44
It would be helpful if you could post a get pixel and set pixel c++ function below — arny berns, Dec 30 '14 at 18:45
http://stackoverflow.com/questions/7743545/pygame-quick-pixel-reading — Fernando, Dec 31 '14 at 20:46

Irrational Person · Accepted Answer · 2014-12-30T20:27:04.150

0

C++ SetPixel and GetPixel function

Part of window.h library

Set Pixel at coords with color

COLORREF SetPixel(
  _In_  HDC hdc,
  _In_  int X,
  _In_  int Y,
  _In_  COLORREF crColor
);

Return color of pixel at specified coords

COLORREF GetPixel(
  _In_  HDC hdc,
  _In_  int nXPos,
  _In_  int nYPos
);

SDL:

Get Color

Uint32 rawpixel = getpixel(surface, x, y);
Uint8 red, green, blue;

SDL_GetRGB(rawpixel, surface->format, &red, &green, &blue);

SetPixel at coords

void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
{
    Uint32 *pixmem32;
    Uint32 colour;  

    colour = SDL_MapRGB( screen->format, r, g, b );

    pixmem32 = (Uint32*) screen->pixels  + y + x;
    *pixmem32 = colour;
}

Link

edited Dec 30 '14 at 20:27

answered Dec 30 '14 at 18:49

Irrational Person

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Wondeful! How can this be implemented into a pygame program? – arny berns Dec 30 '14 at 18:50
you should see the comment with the link above – Irrational Person Dec 30 '14 at 18:51
2

I don't think this solution can be integrated with a pygame application, pygame uses SDL for rendering graphics, the functions you provide are part of the MS Windows API and are intended to be used on a Windows window, not in a pygame surface. – Fernando Dec 30 '14 at 19:11
Sorry these two functions (window API and SDL) were the only available functions that do what the op wants – Irrational Person Dec 30 '14 at 20:39

fast way to get and set pixel color in pygame

1 Answers1