Pixel operations of 24-Bit Bitmap in 32bpp window mode (2)

when the logic of the ranging scroll is almost written, it is found that the previously written bitmap has some problems with the Code in the display table, therefore, a function is rewritten to get a map directly on bitmap24_ptr Based on the surface size and Input coordinates. The complete code is provided first:

Int pickbitmap (lpdirectdrawsurface7 lpdds, bitmap24_ptr bitmap, long ddswidth, long ddsheight, long CX, long CY) <br/>{< br/> long bitmapwidth = Bitmap-> infoheader. biwidth; <br/> long bitmapheight = Bitmap-> infoheader. biheight; </P> <p> ddsurfacedesc2 ddsd; <br/> ddraw_init_struct (ddsd); <br/> lpdds-> lock (null, & ddsd, expires | ddlock_wait, null); <br/> int mempitch = ddsd. lpitch; <br/> uchar * ddsbuffer = (uchar *) (ddsd. lpsurface); </P> <p> for (long DY = 0, by = Cy; dy <ddsheight; ++ dy, ++) <br/> {<br/> memcpy (ddsbuffer + dy * mempitch, bitmap-> buffer + cx * 4 + by * bitmapwidth * 4, 4 * ddswidth ); <br/>}</P> <p> // displaymemory (ddsbuffer, mempitch * ddsheight); </P> <p> lpdds-> unlock (null ); </P> <p> return 1; <br/>}

This function was called to complete the unit test for one afternoon ~ Ah, there is no way to achieve low IQ.

This is also the first debugging of large-scale memory content after I switched to C/C ++. I still don't know what tools are available, so I wrote a plug-in first, the displaymemory function annotated in the above Code. The Code is as follows:

Char hextable [16] = {'0', '1', '2', '3', '4', '5', '6', '7 ', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F '}; </P> <p> void displaymemory (uchar * buffer, Long SIZE) <br/>{< br/> char * MSG = (char *) malloc (size * 3 + 1); </P> <p> for (long I = 0; I <size; ++ I) <br/>{< br/> char C1, C2, C3; <br/> C1 = hextable [(INT) (buffer [I])/16]; <br/> C2 = hextable [(INT) (buffer [I]) % 16]; <br/> C3 = ''; <br/> MSG [I * 3] = C1; <br/> MSG [I * 3 + 1] = c2; <br/> MSG [I * 3 + 2] = C3; <br/>}< br/> MSG [size * 3] = '/0 '; </P> <p> MessageBox (null, MSG, "Memory", mb_ OK); </P> <p> free (MSG); <br/>}

After the problem is solved, you can have a good sleep.