[Xpert]DGA and PseudoColor

[Arne Caspari]

Hello, 

i want to change the colormap-entries of an 8-bpp PseudoColor
mode. Unfortunately it does not work. 

I set up a collormap where every color is black and another one, where
every color is yellow. After setting the video mode and clearing it
with zeros, I install the black colormap, wait 3 seconds and then I
install the yellow colormap and wait 3 seconds to see the result.

I thought that I would then see a black screen and after 3 seconds I
would see a yellow screen. But all I see is the black screen so the
yellow colormap seems not to be installed.

I have appended my source-code and would appreciate your help.

Regards, Arne Caspari





-----//snip//------------
#include <stdlib.h>
#include <stdio.h>

#include <X11/Xos.h>
#include <X11/Intrinsic.h>
#include <X11/Shell.h>
#include <X11/StringDefs.h>
#include <X11/Xatom.h>
#include <X11/extensions/xf86dga.h>


int main(){
        Display *dis;
        XDGAMode *mode;
        XDGADevice *device;
        Colormap black_cmap;
        Colormap yellow_cmap;
        int selectedMode=-1;
        int num;
        int i, j;
        
        
        if (geteuid()){
                fprintf(stderr, "Must be root!\n");
                exit(1);
        }
        
        if ( (dis=XOpenDisplay(NULL))==NULL){
                fprintf(stderr, "Cannot connect to X server %s\n", XDisplayName(NULL));
                exit(-1);
        }
        
        mode=XDGAQueryModes(dis, DefaultScreen(dis), &num);
        for (i=0; i<num; i++){
                printf ("----------------------------\n");
                printf ("Mode: %i\n", mode[i].num);
                printf ("%i x %i x %i\n", 
                        mode[i].viewportWidth, 
                        mode[i].viewportHeight, 
                        mode[i].depth);
                switch (mode[i].visualClass){
                case PseudoColor:
                        printf("PseudoColor\n");
                        break;
                default:
                        break;
                }
                if (mode[i].viewportWidth==800 &&
                    mode[i].viewportHeight==600 &&
                    mode[i].depth==8){
                        selectedMode=mode[i].num;
                }
                
        }
        printf ("----------------------------\n");
        XFree(mode);
        printf ("Selected mode: %i\n", selectedMode);
        printf ("Bpp: %i\n",DisplayPlanes(dis, DefaultScreen(dis)));
        
        if (!XDGAOpenFramebuffer(dis, DefaultScreen(dis))){
                fprintf(stderr, "Failed to map framebuffer-memory!\n");
                exit(2);
        }

        if ( (device=XDGASetMode(dis, DefaultScreen(dis), selectedMode))==NULL){
                fprintf(stderr, "Cannot set Mode!\n");
                exit(2);
        }

        XDGASetViewport(dis, DefaultScreen(dis), 0, 0, XDGAFlipRetrace);
        

        black_cmap=XDGACreateColormap(dis, DefaultScreen(dis), device, AllocAll);
        for (i=0; i<256; i++){
                XColor xcol;
                
                xcol.pixel=i;
                xcol.red=0;
                xcol.green=0;
                xcol.blue=0;
                xcol.flags=DoBlue|DoRed|DoGreen;
                XStoreColor(dis, black_cmap, &xcol);
        }
        yellow_cmap=XDGACreateColormap(dis, DefaultScreen(dis), device, AllocAll);
        for (i=0; i<256; i++){
                XColor xcol;
                
                xcol.pixel=i;
                xcol.red=255*255;
                xcol.green=255*255;
                xcol.blue=0;
                xcol.flags=DoBlue|DoRed|DoGreen;
                XStoreColor(dis, yellow_cmap, &xcol);
        }
        
        //Fill viewport with 0s 
        memset(device->data, (unsigned char)0, 
device->mode.viewportWidth*device->mode.viewportHeight);

        XDGAInstallColormap(dis, DefaultScreen(dis), black_cmap);

        sleep(3);

        XDGAInstallColormap(dis, DefaultScreen(dis), yellow_cmap);
        
        sleep(3);
        
        XDGACloseFramebuffer(dis, DefaultScreen(dis));
        XDGASetMode(dis, DefaultScreen(dis), 0);
        exit(0);
}
-------------------------//snip//-----------------------------------

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