Problems w/SDL_BlitSurface()

SDL Development
1

Hello fellows!
When I run this code:

                for (int x = 0; x <= 5; x++)
                {
                        for (int y = 0; y <= 9; y++)
                        {
                                if (mBack[x][y] == 0)
                                {
                                        SDL_Rect src, dest;

                                        src.x = 0;
                                        src.y = 0;

                                        dest.x = x * 60;
                                        dest.y = y * 60;

                                        src.w = 60;
                                        src.h = 60;
                                        dest.w = 60;
                                        dest.h = 60;

                                        SDL_BlitSurface(mBackTiles, &src, screen, &dest);
                                        // Only for debug
					// std::cout << "0\n";
                                        continue;
				}

					... // Bla, bla

(gdb)r
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 1017)]
0x4004b883 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
Current language: auto; currently c
(gdb) bt
#0 0x4004b883 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
#1 0x0804998b in Back::Draw(SDL_Surface*) (this=0x8056048, screen=0x804d6d8)
at cBack.cpp:71
#2 0x08048d24 in Spel::MainLoop() (this=0x804a888) at cSpel.cpp:49
#3 0x08049bd1 in main () at main.cpp:7
#4 0x4018abb4 in __libc_start_main () from /lib/libc.so.6

I’m a beginner on SDL and game programming, so I’m really greatfull if anybody take time to look at this mess.

2

what is the size of your screen? You might be running off the end with the <=.On Tuesday 02 March 2004 11:41 am, Daniel L?nnstr?m wrote:

Hello fellows!
When I run this code:

                for (int x = 0; x <= 5; x++)
>                 {
>                         for (int y = 0; y <= 9; y++)
>                         {
>                                 if (mBack[x][y] == 0)
>                                 {
>                                         SDL_Rect src, dest;
>
>                                         src.x = 0;
>                                         src.y = 0;
>
>                                         dest.x = x * 60;
>                                         dest.y = y * 60;
>
>                                         src.w = 60;
>                                         src.h = 60;
>                                         dest.w = 60;
>                                         dest.h = 60;
>
>                                         SDL_BlitSurface(mBackTiles, &src,
> screen, &dest); // Only for debug
> 					// std::cout << "0\n";
>                                         continue;
> 				}
>
> 					... // Bla, bla

(gdb)r
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 1017)]
0x4004b883 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
Current language: auto; currently c
(gdb) bt
#0 0x4004b883 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
#1 0x0804998b in Back::Draw(SDL_Surface*) (this=0x8056048,
screen=0x804d6d8) at cBack.cpp:71
#2 0x08048d24 in Spel::MainLoop() (this=0x804a888) at cSpel.cpp:49
#3 0x08049bd1 in main () at main.cpp:7
#4 0x4018abb4 in __libc_start_main () from /lib/libc.so.6

I’m a beginner on SDL and game programming, so I’m really greatfull if
anybody take time to look at this mess.

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http://www.libsdl.org/mailman/listinfo/sdl

3

300x600. 600/60 = 10 300/60 = 5

/ DanneOn Tue, Mar 02, 2004 at 01:05:34PM -0800, Tom Bradley wrote:

what is the size of your screen? You might be running off the end with the <=.