Thread: Pic not showing up

Hey everyone, I've been trying (slowly, unsuccessfully) to learn DirectDraw, but it hasn't been working for me. As far as I can tell, my code which loads a bitmap is working fine, since earlier I succeeded in making a ship appear on the screen (discoloured, but whole). However, now that I've changed some stuff, (i.e. moved away from keeping an array here and a bit of stuff there to having a struct containing the bitmap data), the ship won't show up! Could somebody take a look at my code and point out what's wrong?

PHP Code:

struct BITMAP_FILE
{
    BITMAPFILEHEADER bfh;
    BITMAPINFOHEADER bih;
    PALETTEENTRY palette[256];
    unsigned char* data;
};

struct BITMAP_OBJECT
{
    int state;
    int attr;
    int x, y;
    int xv, yv;
    int width, height;
    LPDIRECTDRAWSURFACE image;
};

bool CreateBitmapObj(BITMAP_OBJECT& bo, BITMAP_FILE& bf, int flags, int cx, int cy, int mode)
{
    //Create

    DDSURFACEDESC ddsd;
    memset(&ddsd, 0, sizeof(ddsd));
    ddsd.dwSize = sizeof(ddsd);
    ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT;
    ddsd.dwWidth = bo.width = bf.bih.biWidth;
    ddsd.dwHeight = bo.height = bf.bih.biHeight;
    ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | flags;

    memset(&bo, 0, sizeof(bo));
    bo.state = BOBJ_STATE_ALIVE;
    bo.image = NULL;

    if(ddraw->CreateSurface(&ddsd, &bo.image, NULL) != DD_OK)
        return false;

    DDCOLORKEY key;
    key.dwColorSpaceHighValue = 0;
    key.dwColorSpaceLowValue = 0;
    bo.image->SetColorKey(DDCKEY_SRCBLT, &key);

    //Load

    if(mode == BOBJ_MODE_CELL)
    {
        x *= bo.width + 1;
        y *= bo.height + 1;
    }

    unsigned char* src;
    unsigned char* dest;

    src = bf.data + (y * bf.bih.biWidth) + x;

    memset(&ddsd, 0, sizeof(ddsd));

    bo.image->Lock(NULL, &ddsd, DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR, NULL);

    dest = (unsigned char*)ddsd.lpSurface;
    for(int y = 0; y < bo.height; ++y)
    {
        memcpy(dest, src, bo.width);
        dest += bo.width;
        src += bf.bih.biWidth;
    }

    bo.image->Unlock(ddsd.lpSurface);

    bo.state |= BOBJ_STATE_LOADED;

    return true;
}

void DrawBitmapObj(BITMAP_OBJECT& bo, LPDIRECTDRAWSURFACE dest)
{
    RECT src, dst;

    src.left = 0;
    src.top = 0;
    src.right = bo.width - 1;
    src.bottom = bo.height - 1;

    dst.left = bo.x;
    dst.top = bo.y;
    dst.right = bo.x + bo.width - 1;
    dst.bottom = bo.y + bo.height - 1;

    dest->Blt(&dst, bo.image, &src, DDBLT_WAIT | DDBLT_KEYSRC, NULL);
} 


DirectDraw doesnt come with any functions to load bitmaps, but microsoft has programmed some anyway.

I have attached a zip file with ddutil.h and ddutil.cpp. Complie ddutil.cpp with your project and add ddutil.h with your #includes.

There is a function called DDLoadBitmap() that loads a bitmap into a surface. Then all you have to do is blit that surface to your backbuffer and Flip().

Oh, and there is too much wrong with the your code to even know where to get started

Oh, and there is too much wrong with the your code to even know where to get started

Well, that's nice to know I'll take a look at the DDUtil thing though. BTW, is it actually a DirectX thing, or just a misc. tool that M$ made? And should I already have it, or do I really have to download it? (I'll download it anyways )

Long live the GDI eh?

Yep Although I pass on, its legacy remains...

Screw the GDI! Its sucks! Go to hell stupid GDI.

Just foolin'.

Actually, I'm not sure where you're supposed to get those files, but I learned about thier existence and downloaded them from sunlight's page.

I hope they help ya.

Hmm, sound like Sunlight made 'em Oh well, if he made them they ought to be good

No, they are made by Micro$oft. Look at the source code.

Made by Microsoft? Sounds good Except that I might be just furthering their cause to take over the world

Actually, I'm not sure where you're supposed to get those files, but I learned about thier existence and downloaded them from sunlight's page.

I just had a brainwave, and I did a search on my comp for them. Guess what? They were in the include section of my DirectX8 SDK folder Oh well, at least I know they're there now

**EDIT**
oops, I just did another search, and they disappeared Oh well

I'm an emotional guy

Did you cry when Bambi and ET died?

I cried for Bambi but et was too ugly!