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0

I want to read pixels from the screen/monitor after the image has been displayed to the user.

MS provides Graphics.CopyFromScreen which apparently:

Performs a bit-block transfer of color data from the screen to the
drawing surface of the Graphics.

But is this really true? Does it not read the pixels from the frame buffer?

glReadPixels (doc) reads from the frame buffer - is that before or after the screen has been updated (it doesn't specify)?

Would the "MS" equivalent to glReadPixels be to use DirectX's GetBuffer? (such as the answer provided here)

opengl graphics directx glreadpixels

share|improve this question

asked Mar 7 at 13:08

pookiepookie

1,35031541

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Using OpenGL (with context and other stuff) glReadPixels reads from the buffer bound to GL_READ_FRAMEBUFFER. It happens that the shown window is also bound for reading. So you read pixels after the image is displayed.
  
  – Ripi2
  Mar 7 at 20:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How do you present the content on the screen? Rendered with OpenGL -> use glReadPixels. Rendered with DirectX -> use directx method. Other method -> depends on which method you are using.
  
  – BDL
  Mar 8 at 8:43
  

  
  
  
  

add a comment | 

0

I want to read pixels from the screen/monitor after the image has been displayed to the user.

MS provides Graphics.CopyFromScreen which apparently:

Performs a bit-block transfer of color data from the screen to the
drawing surface of the Graphics.

But is this really true? Does it not read the pixels from the frame buffer?

glReadPixels (doc) reads from the frame buffer - is that before or after the screen has been updated (it doesn't specify)?

Would the "MS" equivalent to glReadPixels be to use DirectX's GetBuffer? (such as the answer provided here)

opengl graphics directx glreadpixels

share|improve this question

asked Mar 7 at 13:08

pookiepookie

1,35031541

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Using OpenGL (with context and other stuff) glReadPixels reads from the buffer bound to GL_READ_FRAMEBUFFER. It happens that the shown window is also bound for reading. So you read pixels after the image is displayed.
  
  – Ripi2
  Mar 7 at 20:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How do you present the content on the screen? Rendered with OpenGL -> use glReadPixels. Rendered with DirectX -> use directx method. Other method -> depends on which method you are using.
  
  – BDL
  Mar 8 at 8:43
  

  
  
  
  

add a comment | 

I want to read pixels from the screen/monitor after the image has been displayed to the user.

MS provides Graphics.CopyFromScreen which apparently:

Performs a bit-block transfer of color data from the screen to the
drawing surface of the Graphics.

But is this really true? Does it not read the pixels from the frame buffer?

glReadPixels (doc) reads from the frame buffer - is that before or after the screen has been updated (it doesn't specify)?

Would the "MS" equivalent to glReadPixels be to use DirectX's GetBuffer? (such as the answer provided here)

opengl graphics directx glreadpixels

share|improve this question

asked Mar 7 at 13:08

pookiepookie

1,35031541

share|improve this question

asked Mar 7 at 13:08

pookiepookie

1,35031541

share|improve this question

asked Mar 7 at 13:08

pookiepookie

1,35031541

asked Mar 7 at 13:08

pookiepookie

1,35031541

asked Mar 7 at 13:08

pookiepookie

1,35031541