More questions on Colormaps and crashes...

[Colin Thomas <colin designresources co uk>]

Hi (again),

I have modified my code to apparently "free" allocated colorcells but I still
get crashes with:

Gdk-ERROR **: BadAlloc (insufficient resources for operation)
  serial 38240 error_code 11 request_code 84 minor_code 0

In my application I need to refresh a Drawing area each second. The drawing
area is made up from a pixmap, which has hundreds of rectangles & polygons, whose
colours are limited to just 20, but continuously vary.

I create my 20 GdkColors, and each rect/poly is represented by a C++ class
which has a pointer, which points to the current colour (one of the 20).

When I am refreshing the pixmap for a particular rectangle I do the following:

/////////////////////////////////////////////////////////////
 //Create a new color
 GdkColor thisLayerColour[1];
 //get the desired color from the particlaur rectangle class 
 thisLayerColour[0] = (*((*thisRect).GETColour()));
 //Allocate the color
 gdk_colormap_alloc_color (gdk_colormap_get_system () , &thisLayerColour[0] , FALSE, TRUE);
 /Set the foreground colour
 gdk_gc_set_foreground( thisGraphicsContext, &(thisLayerColour[0]) );
 /////////////////////////////////////
 //Create a rectangle to write to the pixmap
 GdkRectangle update_rect;
 update_rect.x      = xl;
 update_rect.y      = yh;
 update_rect.width  = (xh - xl);
 update_rect.height = (yl - yh);
 /////////////////////////////////////
 //draw rectangle to Pixmap
 gdk_draw_rectangle (PixMap,
                     thisGraphicsContext,
                     TRUE,
                     update_rect.x, update_rect.y,
                     update_rect.width, update_rect.height
                    );
 //Free (?) the allocated colour
 gdk_colormap_free_colors(gdk_colormap_get_system () ,thisLayerColour , 1);

/////////////////////////////////////////////////////////////

Everything works well (colours on the rectangles are changing), and then I get :

Gdk-ERROR **: BadAlloc (insufficient resources for operation)
  serial 38240 error_code 11 request_code 84 minor_code 0
  
I would be grateful to know that the above code is actually freeing up the allocated colours, or have I 
misconstrude something.

Can I get the number of current allocated colours from the colormap ?

I look forward to your collective thoughts....


best regards

/colin.


Date: Thu, 28 Jun 2001 17:51:10 +0100 (BST)
From: Colin Thomas <colin designresources co uk>
Subject: Dumb question re color allocation
To: gtk-app-devel-list gnome org
Cc: colin maggie
MIME-Version: 1.0
Content-MD5: jG8jx/2irAHFdQ2gk8qzgQ==

Hi,

This is probably a dumb question, but what the hell ;-)

The have a color defined i.e.

 GdkColor guiColourPurple  = {0, 0xffff, 0x0000, 0xffff};

I want to use this multiple times, in various windows.

Do I need to allocate just ONCE or for each usage ? (my gtk books
are a little vague on this)... i.e.

gdk_color_alloc (gdk_colormap_get_system () , &guiColourPurple); 

If I know I have finished with a colour, can I/should I,  de-allocate it ?

At present I am getting the following:

Gdk-ERROR **: BadAlloc (insufficient resources for operation)
  serial 68077 error_code 11 request_code 84 minor_code 0


(I am on Solaris BTW)...

Many thanks in advance...

/colin.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Colin Thomas. 
| Design Consultant.                             
|                                           
| Email   : colin designresources co uk     
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| Fax     : (44) 1234 241262               
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