[DGDK] Distorted screenshot - GameCreators Forum

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Mireben

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Posted: 27th Feb 2010 14:01 Edited at: 27th Feb 2010 14:27

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I tried to save a screenshot of my application with dbGetImage and dbSaveImage. Whatever I set the display resolution to, the number of pixels in the resulting image does not correspond to the screen resolution and so the aspect ratio will be distorted.

I even tried to copy the screen bitmap to another bitmap first and then get the image from that bitmap. The bitmap size is still OK but as soon as I use GetImage, the image is distorted. Project is attached to reproduce the problem.

(EDIT: as a workaround, I tried to save the copied bitmap to disk, but that does not work either. I opened another thread for that problem.)

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IanM

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Posted: 28th Feb 2010 00:12

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This one is not a bug.

There are two versions of dbGetImage - one has 5 parameters (the one you are using) and stretches the dimensions of the image it creates to the next higher power-of-2 (so 640 becomes 1024 and 480 becomes 512). Doing this (on older cards at least) makes using those textures more efficient during rendering.

The other version (the one with 6 parameters) allows you to determine whether that stretching takes place or not. If you set the last value to 0, stretching will still occur. If you set it to 1 then it will not.

Change your code and add an extra ',1' as the last parameter of your dbGetImage, and you'll see that it works.

Utility plug-ins collection (updated 08 Dec 2009) and
http://www.matrix1.demon.co.uk

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Morcilla

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Posted: 1st Mar 2010 11:49 Edited at: 1st Mar 2010 11:50

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Quote: "Change your code and add an extra ',1' as the last parameter of your dbGetImage, and you'll see that it works."

Yes, you can try these lines:

+ Code Snippet

char my_filename[256] ;
char test_my_filename[256] ;
int picture_counter=0;

strcpy(my_filename, "my_screenshot");
strcpy(test_my_filename, my_filename);
strcat(test_my_filename, ".bmp");

picture_counter++; //=1

while ( dbFileExist ( test_my_filename ) )
{
  strcpy(test_my_filename, my_filename);
  strcat(test_my_filename, "_");		 
  strcat(test_my_filename, dbStr( (int) picture_counter) );	 
  strcat(test_my_filename, ".bmp");			 
  picture_counter++; 
}

strcpy(my_filename, test_my_filename);		

dbGetImage(65535,0,0,dbScreenWidth(),dbScreenHeight(),1);
dbSaveImage(my_filename,65535,0);

dbDeleteImage(65535);

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Bug Reports / [DGDK] Distorted screenshot

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