i have an issue with a fix i made to allow a flood filled object be printed...
so, the full story is we were using the windows GDI FloodFill function, which we noticed doesnt work on printers, so what i found on the inet, was to create a memory DC, compatible with the printer DC, and make all my drawing operations on the memory DC, and then BitBlt it all at once to the printer DC (i had to change to use a recursive, color replacment flood fill function too, since the memory DC only allows what the main DC did)
the problem is the memory DC seems to be a pixel or two bigger on the x and y, but i dont know what to do, when i get the selected bitmap from the memory DC, it shows it to be the correct size, i would like to use StretchBlt, but the values i have access to use as params for StretchBlt, make it no different than calling BitBlt
heres my code:
Code:
HDC hMemPrnDC = CreateCompatibleDC (hPrnDC);
HBITMAP hBitmap = CreateCompatibleBitmap (hPrnDC, iWidthLP, iHeightLP);
HBITMAP hOldBitmap = SelectBitmap (hMemPrnDC, hBitmap);
// paint the whole memory DC with the window color
HBRUSH hBrush = CreateSolidBrush (GetSysColor (COLOR_WINDOW));
RECT rect;
// add one to right and bottom, FillRect doesnt include the right and bottom edges
SetRect (&rect, 0, 0, iWidthLP + 1, iHeightLP + 1);
// NOTE: im doing this cause it starts out as all black
FillRect (hMemPrnDC, &rect, hBrush);
// delete object
DeleteBrush (hBrush);
//
// do all my MoveToEx, LineTo, Ellipse, Arc, TextOut,
// SetPixel, etc calls on hMemPrnDC here
//
// copy all the memory DC drawing data to the printer DC
BitBlt (hPrnDC, 0, 0, iWidthLP, iHeightLP, hMemPrnDC, 0, 0, SRCCOPY);
// select old bitmap, and clean up objects
SelectBitmap (hMemPrnDC, hOldBitmap);
DeleteBitmap (hBitmap);
DeleteDC (hMemPrnDC);
hMemPrnDC = NULL;
here is a link to a PDF print where I draw straight to the printer DC:
hPrnDC.pdf
and here is the same but I draw to the memory DC then BitBlt it to the printer DC:
hMemPrnDC.pdf
now, I did enable my recursive flood fill function on the second, to show an example of what we are trying to achieve, it does the same without it, so that is not an issue
as you can see, the bottom and right edge are cut off, I'm also concerned about the differences in font & line weight between the two, but not as much as the sizing mismatch
NOTE: the filename printed at the top doesn't go through the memory DC, that is always drawn straight to the printer DC
let me know if you need more info...
thanks in advance!!!
