Locking a GDI+ Bitmap in Native C++?
- by user146780
I can find many examples on how to do this in managed c++ but none for unmanaged.
I want to get all the pixel data as efficiently as possible, but some of the scan0 stuff I would need more info about so I can properly iterate through the pixel data and get each rgba value from it.
right now I have this:
Bitmap *b = new Bitmap(filename);
if(b == NULL)
{
return 0;
}
UINT w,h;
w = b->GetWidth();
h = b->GetHeight();
Rect *r = new Rect(0,0,w,h);
BitmapData *lockdat;
b->LockBits(r,ImageLockModeRead,PixelFormatDontCare,lockdat);
delete(r);
if(w == 0 && h == 0)
{
return 0;
}
Color c;
std::vector<GLubyte> pdata(w * h * 4,0.0);
for (unsigned int i = 0; i < h; i++) {
for (unsigned int j = 0; j < w; j++) {
b->GetPixel(j,i,&c);
pdata[i * 4 * w + j * 4 + 0] = (GLubyte) c.GetR();
pdata[i * 4 * w + j * 4 + 1] = (GLubyte) c.GetG();
pdata[i * 4 * w + j * 4 + 2] = (GLubyte) c.GetB();
pdata[i * 4 * w + j * 4 + 3] = (GLubyte) c.GetA();
}
}
delete(b);
return CreateTexture(pdata,w,h);
How do I use lockdat to do the equivalent of getpixel?
Thanks
