GRRLib Forum / Text corruption during runtime

chatuser · 2010-09-10 13:25:57

I'll try to explain this problem using my poor English:

I have implemented a console to display a log of communication messages. I erase the screen using this function:

Code:

void Console::clearScreen() {

    if (!consoleMode)
        return;

    mutexLock();

    GRRLIB_FillScreen(GRRLIB_NAVY);
    GRRLIB_PrintfTTF(console_minimum_x,console_minimum_y,myFont,"press B button to exit from console mode ",getFontSize(),GRRLIB_YELLOW);
    xConsola = console_minimum_x;
    yConsola = console_minimum_y+getFontSize()+1;
    GRRLIB_Screen2Texture(0,0,copyConsole,false);

    setRender(true);
    mutexUnlock();
}

And I write on the screen usign this function:

Code:

void Console::print(const char* str,const u32 color) {

    if (!consoleMode)
        return;

    mutexLock();

    // restore previous screen
    GRRLIB_DrawImg(0,0,copyConsole,0,1,1,GRRLIB_WHITE);

    char str[200];
    strncpy(str,str,200);
    unsigned previous = 0;
    for (unsigned i=0; i<strlen(str); i++)
        if (str[i]=='\n') {
            str[i] = '\0';
            GRRLIB_PrintfTTF(xConsole,yConsole,myFont,str+previous,getFontSize(),color);
            previous = i+1;
            xConsole=Console_minimum_x;
            yConsole+=getFontSize()+1;
        }

    if (strlen(str) != previous) {
        GRRLIB_PrintfTTF(xConsole,yConsole,myFont,str+previous,getFontSize(),color);
        // ignore multiline strings
        xConsole+=GRRLIB_WidthTTF(getFont(),str+previous,getFontSize());
        if (xConsole>=(unsigned)rmode->fbWidth-50) {
            xConsole=Console_minimum_x;
            yConsole+=getFontSize()+1;
        }
    }

    // clear screen instead scrolling
    if (yConsole>=rmode->xfbHeight)
        //yConsole=Console_minimum_y+getFontSize()+1;
        clearScreen();

    // copy screen content
    GRRLIB_Screen2Texture(0,0,copyConsole,false);

    setRender(true);
    mutexUnlock();
}

Well, a communications thread uses these functions to write text on the screen and if console mode is cancelled then the main() function takes the control of the screen. Mutexes are used to let main() function call to GRRLIB_Render() when something is waiting to be displayed on the screen.

The problem is that after every GRRLIB_DrawImg() call the text on the screen gets corrupted, even the background of color GRRLIB_NAVY gets darker, and the text on the top of the screen is more corrupted that in the middle, the last displayed text is almost perfect.

I have no idea about what happens, thanks in advance.

NoNameNo · 2010-09-10 14:12:37

hi,

i bet your GRRLIB_Settings.antialias is true try setting it to false, and tell me.

NNN

chatuser · 2010-09-10 16:32:52

The problem continues using this code:

Code:

    GRRLIB_Init();
    GRRLIB_SetAntiAliasing(false);

Is there any way to change this setting ?

Last edited by chatuser (2010-09-10 16:33:48)

chatuser · 2010-09-10 19:22:57

This is a screenshot showing the problem:

The image gets more corrupted every time GRRLIB_Render() is called.

Last edited by chatuser (2010-09-10 20:03:01)

chatuser · 2010-09-11 22:12:56

Don't ask me how, I have changed the order of some GRRLIB functions calls and now it works as expected, I think there is some "magical" combination of operations that causes this problem, but now it has been solved.

Crayon · 2010-09-12 00:34:27

chatuser wrote:
Don't ask me how, I have changed the order of some GRRLIB functions calls and now it works as expected, I think there is some "magical" combination of operations that causes this problem, but now it has been solved.

If it's possible we would appreciate to see your modifications. Thanks.

chatuser · 2010-09-14 12:14:29

Sorry for answering late, I have reordered and simplified the code, but after of tons of tests I can't say what exactly solved the problem.

I have removed the mutexes and reduced the number of GRRLIB_Render() calls, I suspect that mutexes and interlaced GRRLIB_Render() calls fouled up the program logic.

#1 2010-09-10 13:25:57

Text corruption during runtime

Code:

Code:

#2 2010-09-10 14:12:37

Re: Text corruption during runtime

#3 2010-09-10 16:32:52

Re: Text corruption during runtime

Code:

#4 2010-09-10 19:22:57

Re: Text corruption during runtime

#5 2010-09-11 22:12:56

Re: Text corruption during runtime

#6 2010-09-12 00:34:27

Re: Text corruption during runtime

chatuser wrote:

#7 2010-09-14 12:14:29

Re: Text corruption during runtime

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