/*
 * standard table class.
 *
 * paint functions.
 *
 * see table.h for interface description
 */

#include <precomp.h>

#include "table.h"
#include "tpriv.h"

#ifdef WIN32

int
GetTextExtent(HDC hdc, LPSTR text, INT len)
{
    SIZE sz;

    GetTextExtentPoint(hdc, text, len, &sz);
    return(sz.cx);
}
#endif

void gtab_updatecontig(HWND hwnd, lpTable ptab, int line, int cell1, int count);

/* change all cr/lf chars in input text to nul chars (used to be spaces, not sure why) */
void gtab_delcr(LPSTR ptext)
{
	LPSTR chp;

	if (ptext == NULL) {
		return;
	}
	for(chp = ptext; (chp = My_mbschr(chp, '\r')) != NULL; ) {
		*chp = '\0';
	}
	for(chp = ptext; (chp = My_mbschr(chp, '\n')) != NULL; ) {
		*chp = '\0';
	}
}
void gtab_delcrW(LPWSTR pwzText)
{
	LPWSTR pwch;

	if (pwzText)
		for(pwch = pwzText; *pwch; pwch++)
			if (*pwch == '\r' || *pwch == '\n')
				*pwch = 0;
}

/* ensure that all visible cells in the given line have valid
 * text and property contents. loop through the cells, picking out
 * contiguous blocks of visible, invalid cells and call
 * gtab_updatecontig to update these from the owner window.
 */
void
gtab_updateline(HWND hwnd, lpTable ptab, int line)
{
	lpCellPos ppos;
	int cell1, cellcount;
	lpLineData pline;
	lpCellData cd;
	int i;

	if (line < 0 || line >= ptab->nlines)
		return;

	pline = &ptab->pdata[line];
	cell1 = 0;
	cellcount = 0;
	for (i = 0; i < ptab->hdr.ncols; i++) {
		ppos = &ptab->pcellpos[i];
		cd = &pline->pdata[i];
		if (ppos->clipstart < ppos->clipend) {
			if ((cd->flags & CELL_VALID) == 0) {
				/* add a cell to the list to be updated*/
				if (cellcount++ == 0) {
					cell1 = i;
				}
			} else {
				/* this cell already valid - so end of
				 * a contig block. if the contig
				 * block just ended contained cells to update,
				 * do it now
				 */
				if (cellcount > 0) {
					gtab_updatecontig(hwnd, ptab,
					  line, cell1, cellcount);
				}
				cellcount = 0;
			}
		}
		/* cell not visible - end of a contig block. If it was a
		 * non-empty contig block, then update it now.
		 */
		if (cellcount > 0)  {
			gtab_updatecontig(hwnd, ptab, line, cell1, cellcount);
			cellcount = 0;	
		}
	}
	if (cellcount > 0) {
		gtab_updatecontig(hwnd, ptab, line, cell1, cellcount);
		cellcount = 0;
	}
}

/*
 * update a contiguous block of invalid cells by calling the owner window
 */
void
gtab_updatecontig(HWND hwnd, lpTable ptab, int line, int cell1, int count)
{
	lpLineData pline;
	lpCellData cd;
	CellDataList list;
	lpProps colprops;
	int i;
	COLORREF rgb;

	pline = &ptab->pdata[line];
	cd = &pline->pdata[cell1];

	list.id = ptab->hdr.id;
	list.row = gtab_linetorow(hwnd, ptab, line);
	list.startcell = cell1;
	list.ncells = count;
	list.plist = cd;

	/* clear out prop flags */
	rgb = GetSysColor(COLOR_WINDOW);
	for (i = 0; i < count; i++) {
		cd[i].props.valid = P_BCOLOUR;
		cd[i].props.backcolour = rgb;
		if (cd[i].nchars > 0) {
			cd[i].ptext[0] = '\0';
			if (cd[i].pwzText) {
				cd[i].pwzText[0] = '\0';
			}
		}
	}

	if (list.row < ptab->hdr.nrows) {
		gtab_sendtq(hwnd, TQ_GETDATA, (LPARAM) &list);
	}

	/* for each cell, mark valid and set properties */
	for (i = 0; i < count; i++) {
		cd[i].flags |= CELL_VALID;
		gtab_delcr(cd[i].ptext);
		gtab_delcrW(cd[i].pwzText);
		/* fetch properties from hdr and colhdr */
		colprops = &ptab->pcolhdr[i + cell1].props;
		if (!(cd[i].props.valid & P_FCOLOUR)) {
			if (colprops->valid & P_FCOLOUR) {
				cd[i].props.valid |= P_FCOLOUR;
				cd[i].props.forecolour = colprops->forecolour;
			} else if (ptab->hdr.props.valid & P_FCOLOUR) {
				cd[i].props.valid |= P_FCOLOUR;
				cd[i].props.forecolour =
					ptab->hdr.props.forecolour;
			}
		}

		if (!(cd[i].props.valid & P_FCOLOURWS)) {
			if (colprops->valid & P_FCOLOURWS) {
				cd[i].props.valid |= P_FCOLOURWS;
				cd[i].props.forecolourws = colprops->forecolourws;
			} else if (ptab->hdr.props.valid & P_FCOLOURWS) {
				cd[i].props.valid |= P_FCOLOURWS;
				cd[i].props.forecolourws =
					ptab->hdr.props.forecolourws;
			}
		}

		if (!(cd[i].props.valid & P_BCOLOUR)) {
			if (colprops->valid & P_BCOLOUR) {
				cd[i].props.valid |= P_BCOLOUR;
				cd[i].props.backcolour = colprops->backcolour;
			} else if (ptab->hdr.props.valid & P_BCOLOUR) {
				cd[i].props.valid |= P_BCOLOUR;
				cd[i].props.backcolour =
					ptab->hdr.props.backcolour;
			}
		}

		if (!(cd[i].props.valid & P_FONT)) {
			if (colprops->valid & P_FONT) {
				cd[i].props.valid |= P_FONT;
				cd[i].props.hFont = colprops->hFont;
			} else if (ptab->hdr.props.valid & P_FONT) {
				cd[i].props.valid |= P_FONT;
				cd[i].props.hFont = ptab->hdr.props.hFont;
			}
		}

		if (!(cd[i].props.valid & P_ALIGN)) {
			if (colprops->valid & P_ALIGN) {
				cd[i].props.valid |= P_ALIGN;
				cd[i].props.alignment = colprops->alignment;
			} else if (ptab->hdr.props.valid & P_ALIGN) {
				cd[i].props.valid |= P_ALIGN;
				cd[i].props.alignment =
					ptab->hdr.props.alignment;
			}
		}

		if (!(cd[i].props.valid & P_BOX)) {
			if (colprops->valid & P_BOX) {
				cd[i].props.valid |= P_BOX;
				cd[i].props.box = colprops->box;
			} else if (ptab->hdr.props.valid & P_BOX) {
				cd[i].props.valid |= P_BOX;
				cd[i].props.box = ptab->hdr.props.box;
			}
		}
		/* you can't set width/height per cell - this
		 * is ignored at cell level.
		 */
	}

}

void
gtab_boxcell(HWND hwnd, HDC hdc, LPRECT rcp, LPRECT pclip, UINT boxmode)
{
	if (boxmode & P_BOXTOP) {
		MoveToEx(hdc, max(rcp->left, pclip->left),
			max(rcp->top, pclip->top), NULL);
		LineTo(hdc, min(rcp->right, pclip->right),
			max(rcp->top, pclip->top));
	}
	if (boxmode & P_BOXBOTTOM) {
		MoveToEx(hdc, max(rcp->left, pclip->left),
			min(rcp->bottom, pclip->bottom), NULL);
		LineTo(hdc, min(rcp->right, pclip->right),
			min(rcp->bottom, pclip->bottom));
	}
	if (boxmode & P_BOXLEFT) {
		MoveToEx(hdc, max(rcp->left, pclip->left),
			max(rcp->top, pclip->top), NULL);
		MoveToEx(hdc, max(rcp->left, pclip->left),
			min(rcp->bottom, pclip->bottom), NULL);
	}
	if (boxmode & P_BOXRIGHT) {
		MoveToEx(hdc, min(rcp->right, pclip->right),
			max(rcp->top, pclip->top), NULL);
		LineTo(hdc, min(rcp->right, pclip->right),
			min(rcp->bottom, pclip->bottom));
	}
}

void
gtab_paintcell(HWND hwnd, HDC hdc, lpTable ptab, int line, int cell, BOOL show_whitespace, BOOL fPrinting)
{
	lpLineData pline;
	lpCellData cd;
	lpCellPos ppos;
	RECT rc, rcbox;
	int cx, x, y;
	UINT align;
	LPSTR chp, tabp;
	LPWSTR pwch, pwchBreak;
	DWORD fcol, fcolOld, fcolws;
	DWORD bkcol, bkcolOld;
	HFONT hfont, hfontOld;
	HBRUSH hbr;
	char szCharSet[] = "\t ";
	WCHAR wzCharSet[] = L"\t ";
	char szSpaceReplace[] = { (char) 183, (char) 0 };
	char szTabReplace[] = { (char) 187, (char) 0 };
	int cxSpaceReplace;
	int cxTabReplace;
	SIZE size;
	TEXTMETRIC tm;
	int yOfs;
	DWORD etoFlags = ETO_CLIPPED;

        fcol = 0; bkcol = 0; /* eliminate spurious diagnostic, generate worse code */
        hfont = 0;           /* eliminate spurious diagnostic, generate worse code */
	/* init pointers to cell text and properties */
	pline = &ptab->pdata[line];
	cd = &pline->pdata[cell];
	ppos = &ptab->pcellpos[cell];

	/* draw gutter */
	rc.top = pline->linepos.clipstart;
	rc.bottom = pline->linepos.clipend;
	rc.left = (cell > 0) ? ptab->pcellpos[cell - 1].clipend : 0;
	rc.right = ppos->clipstart;
	if (cell > ptab->hdr.fixedcols && ptab->hdr.fixedcols < ptab->hdr.ncols) {
		rc.left = max(rc.left, ptab->pcellpos[ptab->hdr.fixedcols].clipstart);
	}
	if (ptab->hdr.fixedcols > 0 && cell == ptab->hdr.fixedcols) {
		rc.right--;
	}
	if (!fPrinting && rc.right > rc.left) {
		FillRect(hdc, &rc, (HBRUSH)(COLOR_WINDOW + 1));
	}

	/* clip all output to this rectangle */
	rc.top = pline->linepos.clipstart;
	rc.bottom = pline->linepos.clipend;
	rc.left = ppos->clipstart;
	rc.right = ppos->clipend;

	/* check cell properties and colours */
	if (cd->props.valid & P_ALIGN) {
		align = cd->props.alignment;
	} else {
		align = P_LEFT;
	}
	//$ FUTURE: This prevents the user's font from being used when printing.
	// For now, that's better than having the output be really tiny, but this
	// needs to be fixed right eventually.
	if (!fPrinting && cd->props.valid & P_FONT) {
		hfontOld = SelectObject(hdc, cd->props.hFont);
	}

	// get y offset to center text vertically within cell
	GetTextMetrics(hdc, &tm);
	yOfs = (rc.bottom - rc.top - tm.tmHeight) / 2;

	/* set replacement chars and char widths */
	cxSpaceReplace = GetTextExtent(hdc, szSpaceReplace, 1);
	cxTabReplace = cxSpaceReplace * ptab->tabchars;

	/* set colours if not default */
	if (!fPrinting) {
		if (cd->props.valid & P_FCOLOUR) {
			fcol = cd->props.forecolour;
			fcolOld = SetTextColor(hdc, fcol);
		}
		if (cd->props.valid & P_FCOLOURWS) {
			fcolws = cd->props.forecolourws;
		}
		else {
			fcolws = fcol;
		}
		if (cd->props.valid & P_BCOLOUR) {
			/* there is a non-default background colour.
			* create a brush and fill the entire cell with it
			 */
			hbr = CreateSolidBrush(cd->props.backcolour);
			if (hbr)
			{
				FillRect(hdc, &rc, hbr);
				DeleteObject(hbr);
			}

			/* also set colour as background colour for the text */
			bkcolOld = SetBkColor(hdc, cd->props.backcolour);
		}
	}

	/* calc offset of text within cell for right-align or centering */
	if (align == P_LEFT) {
		cx = ptab->avewidth/2;
	} else {
		cx = 0;

		if (cd->pwzText) {
			GetTextExtentPoint32W(hdc, cd->pwzText, wcslen(cd->pwzText), &size);
		} else if (cd->ptext) {
			GetTextExtentPoint32A(hdc, cd->ptext, lstrlen(cd->ptext), &size);
		}
		cx = size.cx;

		if (align == P_CENTRE) {
			cx = (ppos->size - cx) / 2;
		} else {
			cx = ppos->size - cx - (ptab->avewidth/2);
		}
	}
	cx += ppos->start;

	/* expand tabs on output and show whitespace on output */
	x = 0;
	y = pline->linepos.start + yOfs;

	/* set search string for strpbrk fn;
	   don't search for space chars unless we're showing whitespace */
	if (!show_whitespace)
	{
		szCharSet[1] = '\0';
		wzCharSet[1] = '\0';
	}

	// determine the string to display (ansi/unicode).  if we have a string
	// and it's not empty, then loop and display it.
	chp = cd->ptext;
	pwch = cd->pwzText;
	if (pwch ? *pwch : (chp && *chp))
	{
		while (TRUE)
		{
			if (pwch)
			{
				pwchBreak = wcspbrk(pwch, wzCharSet);
				if (!pwchBreak)
					pwchBreak = pwch + wcslen(pwch);
			}
			else
			{
				tabp = My_mbspbrk(chp, szCharSet);
				if (!tabp)
					tabp = chp + lstrlen(chp);
			}

			/* perform output up to tab/space char */
			if (pwch)
				ExtTextOutW(hdc, x+cx, y, etoFlags, &rc, pwch, (UINT)(pwchBreak-pwch), NULL);
			else
				ExtTextOutA(hdc, x+cx, y, etoFlags, &rc, chp, (UINT)(tabp-chp), NULL);

			/* advance past the tab */
			if (pwch)
			{
				GetTextExtentPoint32W(hdc, pwch, (UINT)(pwchBreak - pwch), &size);
				pwch = pwchBreak;
			}
			else
			{
				GetTextExtentPoint32A(hdc, chp, (UINT)(tabp - chp), &size);
				chp = tabp;
			}
			x += size.cx;

			// bail if we hit null terminator
			if (pwch ? !*pwch : !*chp)
				break;

			/* handle tab chars */
			while (pwch ? (*pwch == '\t') : (*chp == '\t'))
			{
				/* print replacement char */
				if (show_whitespace)
				{
					if (!fPrinting)
						SetTextColor(hdc, fcolws);

					ExtTextOut(hdc, x + cx, y, etoFlags, &rc, szTabReplace, 1, NULL);

					if (!fPrinting)
						SetTextColor(hdc, fcol);
				}

				/* advance past the tab */
				if (cxTabReplace > 0)
					x += cxTabReplace - (x % cxTabReplace);
				if (pwch)
					pwch = ++pwchBreak;
				else
					chp = ++tabp;
			}

			/* handle space chars */
			if (show_whitespace)
			{
				while (pwch ? (*pwch == ' ') : (*chp == ' '))
				{
					/* replace space char with visible char */
					if (!fPrinting)
						SetTextColor(hdc, fcolws);

					ExtTextOut(hdc, x + cx, y, etoFlags, &rc, szSpaceReplace, 1, NULL);

					if (!fPrinting)
						SetTextColor(hdc, fcol);

					x += cxSpaceReplace;
					if (pwch)
						pwch = ++pwchBreak;
					else
						chp = ++tabp;
				}
			}
		}
	}

	/* reset colours to original if not default */
	if (!fPrinting) {
		if (cd->props.valid & P_FCOLOUR) {
			SetTextColor(hdc, fcolOld);
		}
		if (cd->props.valid & P_BCOLOUR) {
			SetBkColor(hdc, bkcolOld);
		}
		if (cd->props.valid & P_FONT) {
			SelectObject(hdc, hfontOld);
		}
	}

	/* now box cell if marked */
	if (!fPrinting) {
		if ((cd->props.valid & P_BOX)) {
			if (cd->props.box != 0) {
//				rcbox.top = pline->linepos.start;
				rcbox.top = y;
				rcbox.bottom = rcbox.top + pline->linepos.size;
				rcbox.left = ppos->start;
				rcbox.right = ppos->start + ppos->size;
				gtab_boxcell(hwnd, hdc, &rcbox, &rc, cd->props.box);
			}
		}
	}
}

/* fetch and paint the specified line */
void
gtab_paintline(HWND hwnd, HDC hdc, lpTable ptab, int line, BOOL show_whitespace, BOOL fPrinting)
{
	lpCellPos ppos = NULL;
	int i;
	RECT rc;

	if (line < 0 || line >= ptab->nlines)
		return;

	if (!fPrinting)
		GetClientRect(hwnd, &rc);

	gtab_updateline(hwnd, ptab, line);

	for (i = 0; i < ptab->hdr.ncols; i++) {
		ppos = &ptab->pcellpos[i];
		/* show whitespace iff the flag is set
		   and we're painting the main text column */
		if (ppos->clipstart < ppos->clipend) {
			gtab_paintcell(hwnd, hdc, ptab, line, i,
				       (show_whitespace && (i == 2)), fPrinting);
		}
	}

	if (!fPrinting && ppos) {
		rc.top = ptab->pdata[line].linepos.clipstart;
		rc.bottom = ptab->pdata[line].linepos.clipend;
		rc.left = ppos->clipend;
		FillRect(hdc, &rc, (HBRUSH)(COLOR_WINDOW + 1));
	}
}

void
gtab_paint(HWND hwnd)
{
    PAINTSTRUCT ps;
    int y, y2, i;
    HDC hDC = BeginPaint(hwnd, &ps);
    lpTable ptab = (lpTable) GetWindowLongPtr(hwnd, WL_TABLE);

    if (!ptab) {
        FillRect(hDC, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));
    } else {
        /* separator lines between fixed rows/columns
         * (ie headers) and the rest - if enabled
         */
        /* paint here first for good impression,
         * and again after to clean up!!
         */
        if (ptab->hdr.vseparator) {
            gtab_vsep(hwnd, ptab, hDC);
        }
        if (ptab->hdr.hseparator) {
            gtab_hsep(hwnd, ptab, hDC);
        }

        /* paint only the rows that need painting */
        for (i = 0; i < ptab->nlines; i++) {
            y = ptab->pdata[i].linepos.start;
            y2 = y + ptab->pdata[i].linepos.size;
            if ( (y <= ps.rcPaint.bottom) &&
                 (y2 >= ps.rcPaint.top)) {
                gtab_paintline(hwnd, hDC, ptab, i, ptab->show_whitespace, FALSE);
            }
        }
        if (ptab->hdr.vseparator) {
            gtab_vsep(hwnd, ptab, hDC);
        }
        if (ptab->hdr.hseparator) {
            gtab_hsep(hwnd, ptab, hDC);
        }
        if (ptab->selvisible) {
            gtab_invertsel(hwnd, ptab, hDC);
        }
    }

    EndPaint(hwnd, &ps);
}


void
gtab_vsep(HWND hwnd, lpTable ptab, HDC hdc)
{
	int x;
	RECT rc;

	if (ptab->hdr.fixedcols < 1) {
		return;
	}
	x = ptab->pcellpos[ptab->hdr.fixedcols - 1].clipend+1;
	GetClientRect(hwnd, &rc);
	MoveToEx(hdc, x, rc.top, NULL);
	LineTo(hdc, x, rc.bottom);
}

void
gtab_hsep(HWND hwnd, lpTable ptab, HDC hdc)
{
	int y;
	RECT rc;

	if (ptab->hdr.fixedrows < 1) {
		return;
	}
	y = ptab->rowheight * ptab->hdr.fixedrows;
	GetClientRect(hwnd, &rc);
	MoveToEx(hdc, rc.left, y-1, NULL);
	LineTo(hdc, rc.right, y-1);
}

/* draw in (inverting) the dotted selection lines for tracking a col width
 */
void
gtab_drawvertline(HWND hwnd, lpTable ptab)
{
	RECT rc;
	HDC hdc;
	HPEN hpen;

	hdc = GetDC(hwnd);
	if (hdc)
	{
		SetROP2(hdc, R2_XORPEN);
		hpen = SelectObject(hdc, hpenDotted);
		GetClientRect(hwnd, &rc);

		MoveToEx(hdc, ptab->trackline1, rc.top, NULL);
		LineTo(hdc, ptab->trackline1, rc.bottom);
		if (ptab->trackline2 != -1) {
			MoveToEx(hdc, ptab->trackline2, rc.top, NULL);
			LineTo(hdc, ptab->trackline2, rc.bottom);
		}

		SelectObject(hdc, hpen);
		ReleaseDC(hwnd, hdc);
	}
}
	

/*
 * mark the selected line, if visible, in the style chosen by the
 * client app. This can be TM_SOLID, meaning an inversion of
 * the whole selected area or TM_FOCUS, meaning, inversion of the first
 * cell, and then a dotted focus rectangle for the rest.
 *
 * this function inverts either style, and so will turn the selection
 * both on and off.
 */
void
gtab_invertsel(HWND hwnd, lpTable ptab, HDC hdc_in)
{
	HDC hdc;
	int firstline, lastline;
	long startrow, lastrow, toprow, bottomrow;
	RECT rc;
	int lastcell;



	/* get the selection start and end rows ordered vertically */
	if (ptab->select.nrows == 0) {
	    return;
	} else if (ptab->select.nrows < 0) {
	    startrow = ptab->select.startrow + ptab->select.nrows + 1;
	    lastrow = ptab->select.startrow;
	} else {
	    startrow = ptab->select.startrow;
	    lastrow = ptab->select.startrow + ptab->select.nrows -1;
	}

	/* is selected area (or part of it) visible on screen ?  */
	firstline = gtab_rowtoline(hwnd, ptab, startrow);
	lastline = gtab_rowtoline(hwnd, ptab, lastrow);


	if (firstline < 0) {
	    toprow = gtab_linetorow(hwnd, ptab,
	    		ptab->hdr.fixedselectable ? 0: ptab->hdr.fixedrows);
	    if ((toprow >= startrow)  &&
		(toprow <= lastrow)) {
		    firstline = gtab_rowtoline(hwnd, ptab, toprow);
	    } else {
		return;
	    }
	} else {
	    toprow = 0;
	}


	if (lastline < 0) {
	    bottomrow = gtab_linetorow(hwnd, ptab, ptab->nlines-1);
	    if ((bottomrow <= lastrow) &&
		(bottomrow >=startrow)) {
		    lastline = gtab_rowtoline(hwnd, ptab, bottomrow);
	    } else {
		return;
	    }
	}


	rc.top = ptab->pdata[firstline].linepos.clipstart;
	rc.bottom = ptab->pdata[lastline].linepos.clipend;



	/* selection mode includes a flag TM_FOCUS indicating we should
	 * use a focus rect instead of the traditional inversion for
	 * selections in this table. This interferes with multiple backgrnd
	 * colours less.  However we still do inversion for fixedcols.
	 */

	lastcell = (int)(ptab->select.startcell + ptab->select.ncells - 1);


	/*
	 * invert the whole area for TM_SOLID or just the first
	 * cell for TM_FOCUS
	 */
	rc.left = ptab->pcellpos[ptab->select.startcell].clipstart;
	if (ptab->hdr.selectmode & TM_FOCUS) {
		rc.right = ptab->pcellpos[ptab->select.startcell].clipend;
	}else {
		rc.right = ptab->pcellpos[lastcell].clipend;
	}

	if (hdc_in == NULL) {
		hdc = GetDC(hwnd);
		if (!hdc)
			return;
	} else {
		hdc = hdc_in;
	}

	InvertRect(hdc, &rc);

	/*
	 * draw focus rectangle around remaining cells on this line, if there
	 * are any
	 */
	if (ptab->hdr.selectmode & TM_FOCUS) {
		/*
		 * now this is a real fudge. if we are drawing TM_FOCUS
		 * selection, and the real top line is off the top of the
		 * window, then the top of the focus rect will be drawn at
		 * the top of our window. If we then scroll up one line,
		 * a new focus rect will be drawn, but the old top of focus
		 * rect line will still be there as junk on the
		 * screen. To fix this, we have 2 choices: we undo the selection
		 * before every scroll (too slow) or we set the focus rect a little
		 * bigger if the real top line is off-window, so that the top line
		 * is clipped (as it should be). This latter is what we do here
		 */
		if (toprow > startrow) {
		    rc.top--;
		}
		if (ptab->select.ncells > 1) {
			rc.left = ptab->pcellpos[ptab->select.startcell+1].clipstart;
			rc.right = ptab->pcellpos[lastcell].clipend;
			DrawFocusRect(hdc, &rc);
		}
	}

	if (hdc_in == NULL) {
		ReleaseDC(hwnd, hdc);
	}
}