You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
664 lines
22 KiB
664 lines
22 KiB
//-------------------------------------------------------------------------//
|
|
// Rgn.cpp - Bitmap-to-Region transforms
|
|
//
|
|
// History:
|
|
// 01/31/2000 scotthan created
|
|
//-------------------------------------------------------------------------//
|
|
|
|
#include "stdafx.h"
|
|
#include "rgn.h"
|
|
#include "tmutils.h"
|
|
|
|
|
|
//------------//
|
|
// Helpers:
|
|
|
|
//-------------------------------------------------------------------------//
|
|
#define CX_USEDEFAULT -1
|
|
#define CY_USEDEFAULT -1
|
|
|
|
#define _ABS( val1, val2 ) ((val1)>(val2) ? (val1)-(val2) : (val2)-(val1))
|
|
|
|
//-------------------------------------------------------------------------//
|
|
inline BOOL IsColorMatch( COLORREF rgb1, COLORREF rgb2, int nTolerance = 0 )
|
|
{
|
|
if( nTolerance == 0 )
|
|
return (rgb1 << 8) == (rgb2 << 8);
|
|
|
|
return _ABS(GetRValue(rgb1),GetRValue(rgb2)) <= nTolerance &&
|
|
_ABS(GetGValue(rgb1),GetGValue(rgb2)) <= nTolerance &&
|
|
_ABS(GetBValue(rgb1),GetBValue(rgb2)) <= nTolerance;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
inline BOOL _IsNormalRect( IN LPCRECT prc )
|
|
{
|
|
return (prc->right >= prc->left) &&
|
|
(prc->bottom >= prc->top);
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
inline BOOL _IsOnScreenRect( IN LPCRECT prc )
|
|
{
|
|
return prc->left >= 0 && prc->top >= 0 &&
|
|
prc->right >= 0 && prc->bottom >= 0;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
inline void _InPlaceUnionRect( IN OUT LPRECT prcDest, IN LPCRECT prcSrc )
|
|
{
|
|
ASSERT(prcDest);
|
|
ASSERT(prcSrc);
|
|
ASSERT(_IsNormalRect(prcSrc));
|
|
|
|
if( prcDest->left == -1 || prcDest->left > prcSrc ->left )
|
|
prcDest->left = prcSrc ->left;
|
|
|
|
if( prcDest->right == -1 || prcDest->right < prcSrc ->right )
|
|
prcDest->right = prcSrc ->right;
|
|
|
|
if( prcDest->top == -1 || prcDest->top > prcSrc ->top )
|
|
prcDest->top = prcSrc ->top;
|
|
|
|
if( prcDest->bottom == -1 || prcDest->bottom < prcSrc ->bottom )
|
|
prcDest->bottom = prcSrc ->bottom;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
// Walks the pixels and computes the region
|
|
HRGN WINAPI _PixelsToRgn(
|
|
DWORD *pdwBits,
|
|
int cxImageOffset, // image cell horz offset
|
|
int cyImageOffset, // image cell vert offset
|
|
int cxImage, // image cell width
|
|
int cyImage, // image cell height
|
|
int cxSrc, // src bitmap width
|
|
int cySrc, // src bitmap height
|
|
BOOL fAlphaChannel,
|
|
int iAlphaThreshold,
|
|
COLORREF rgbMask,
|
|
int nMaskTolerance )
|
|
{
|
|
// Establish a series of rectangles, each corresponding to a scan line (row)
|
|
// in the bitmap, that will comprise the region.
|
|
const UINT RECTBLOCK = 512;
|
|
UINT nAllocRects = 0;
|
|
HRGN hrgnRet = NULL;
|
|
HGLOBAL hrgnData = GlobalAlloc( GMEM_MOVEABLE,
|
|
sizeof(RGNDATAHEADER) + (sizeof(RECT) * (nAllocRects + RECTBLOCK)) );
|
|
|
|
if( hrgnData )
|
|
{
|
|
nAllocRects += RECTBLOCK;
|
|
|
|
RGNDATA* prgnData = (RGNDATA*)GlobalLock( hrgnData );
|
|
LPRECT prgrc = (LPRECT)prgnData->Buffer;
|
|
|
|
ZeroMemory( &prgnData->rdh, sizeof(prgnData->rdh) );
|
|
prgnData->rdh.dwSize = sizeof(prgnData->rdh);
|
|
prgnData->rdh.iType = RDH_RECTANGLES;
|
|
SetRect( &prgnData->rdh.rcBound, -1, -1, -1, -1 );
|
|
|
|
// invert offset in y dimension since bits are arrayed bottom to top
|
|
int cyRow0 = cySrc - (cyImage + cyImageOffset);
|
|
int cyRowN = (cyRow0 + cyImage) - 1 ; // index of the last row
|
|
|
|
// Compute a transparency mask if not specified.
|
|
if( -1 == rgbMask )
|
|
rgbMask = pdwBits[cxImageOffset + (cyRowN * cxSrc)];
|
|
|
|
//---- pixels in pdwBits[] have RBG's reversed ----
|
|
//---- reverse our mask to match ----
|
|
rgbMask = REVERSE3(rgbMask);
|
|
|
|
//---- rows in pdwBits[] are reversed (bottom to top) ----
|
|
for( int y = cyRow0; y <= cyRowN; y++ ) // working bottom-to-top
|
|
{
|
|
//---- Scanning pixels left to right ----
|
|
DWORD *pdwFirst = &pdwBits[cxImageOffset + (y * cxSrc)];
|
|
DWORD *pdwLast = pdwFirst + cxImage - 1;
|
|
DWORD *pdwPixel = pdwFirst;
|
|
|
|
while (pdwPixel <= pdwLast)
|
|
{
|
|
//---- skip TRANSPARENT pixels to find next OPAQUE (on this row) ----
|
|
if (fAlphaChannel)
|
|
{
|
|
while ((pdwPixel <= pdwLast) && (ALPHACHANNEL(*pdwPixel) < iAlphaThreshold))
|
|
pdwPixel++;
|
|
}
|
|
else
|
|
{
|
|
while ((pdwPixel <= pdwLast) && (IsColorMatch(*pdwPixel, rgbMask, nMaskTolerance)))
|
|
pdwPixel++;
|
|
}
|
|
|
|
if (pdwPixel > pdwLast) // too far; try next row
|
|
break;
|
|
|
|
DWORD *pdw0 = pdwPixel;
|
|
pdwPixel++; // skip over current opaque pixel
|
|
|
|
//---- skip OPAQUE pixels to find next TRANSPARENT (on this row) ----
|
|
if (fAlphaChannel)
|
|
{
|
|
while ((pdwPixel <= pdwLast) && (ALPHACHANNEL(*pdwPixel) >= iAlphaThreshold))
|
|
pdwPixel++;
|
|
}
|
|
else
|
|
{
|
|
while ((pdwPixel <= pdwLast) && (! IsColorMatch(*pdwPixel, rgbMask, nMaskTolerance)))
|
|
pdwPixel++;
|
|
}
|
|
|
|
//---- got a stream of 1 or more opaque pixels on this row ----
|
|
|
|
// allocate more region rects if necessary (a particularly complex line)
|
|
if( prgnData->rdh.nCount >= nAllocRects )
|
|
{
|
|
GlobalUnlock( hrgnData );
|
|
prgnData = NULL;
|
|
HGLOBAL hNew = GlobalReAlloc( hrgnData,
|
|
sizeof(RGNDATAHEADER) + (sizeof(RECT) * (nAllocRects + RECTBLOCK)),
|
|
GMEM_MOVEABLE );
|
|
|
|
if( hNew )
|
|
{
|
|
hrgnData = hNew;
|
|
nAllocRects += RECTBLOCK;
|
|
prgnData = (RGNDATA*)GlobalLock( hrgnData );
|
|
prgrc = (LPRECT)prgnData->Buffer;
|
|
ASSERT(prgnData);
|
|
}
|
|
else
|
|
goto exit; // out of memory
|
|
}
|
|
|
|
// assign region rectangle
|
|
int x0 = (int)(pdw0 - pdwFirst);
|
|
int x = (int)(pdwPixel - pdwFirst);
|
|
int y0 = cyRowN - y;
|
|
|
|
SetRect( prgrc + prgnData->rdh.nCount,
|
|
x0, y0, x, y0+1 /* each rectangle is always 1 pixel high */ );
|
|
|
|
// merge into bounding box
|
|
_InPlaceUnionRect( &prgnData->rdh.rcBound,
|
|
prgrc + prgnData->rdh.nCount );
|
|
prgnData->rdh.nCount++;
|
|
|
|
} // while ()
|
|
} // for(y)
|
|
|
|
if( prgnData->rdh.nCount && _IsOnScreenRect(&prgnData->rdh.rcBound) )
|
|
{
|
|
// Create the region representing the scan line.
|
|
hrgnRet = ExtCreateRegion( NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * nAllocRects),
|
|
prgnData );
|
|
}
|
|
|
|
exit:
|
|
// Free region def block.
|
|
GlobalUnlock( hrgnData );
|
|
GlobalFree( hrgnData );
|
|
}
|
|
|
|
return hrgnRet;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
// Creates a region based on a text string in the indicated font.
|
|
HRGN WINAPI CreateTextRgn( HFONT hf, LPCTSTR pszText )
|
|
{
|
|
HRGN hrgnRet = NULL;
|
|
|
|
if( pszText && *pszText )
|
|
{
|
|
int cchText = lstrlen( pszText );
|
|
|
|
// Create a composite DC for assembling the region.
|
|
HDC hdcMem = CreateCompatibleDC( NULL );
|
|
|
|
SetBkMode( hdcMem, TRANSPARENT );
|
|
SetTextAlign( hdcMem, TA_TOP|TA_LEFT );
|
|
HFONT hfOld = (HFONT)SelectObject( hdcMem, hf );
|
|
|
|
// Derive a region from a path.
|
|
BeginPath( hdcMem );
|
|
TextOut( hdcMem, 0, 0, pszText, cchText );
|
|
EndPath( hdcMem );
|
|
|
|
hrgnRet = PathToRegion( hdcMem );
|
|
|
|
// Clean up composite DC
|
|
SelectObject( hdcMem, hfOld );
|
|
DeleteDC( hdcMem );
|
|
}
|
|
|
|
return hrgnRet;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
// Creates a region based on an arbitrary bitmap, transparency-keyed on a
|
|
// RGB value within a specified tolerance. The key value is optional
|
|
// (-1 == use the value of the first pixel as the key).
|
|
//
|
|
HRESULT WINAPI CreateBitmapRgn(
|
|
HBITMAP hbm,
|
|
int cxOffset,
|
|
int cyOffset,
|
|
int cx,
|
|
int cy,
|
|
BOOL fAlphaChannel,
|
|
int iAlphaThreshold,
|
|
COLORREF rgbMask,
|
|
int nMaskTolerance,
|
|
OUT HRGN *phrgn)
|
|
{
|
|
CBitmapPixels BitmapPixels;
|
|
DWORD *prgdwPixels;
|
|
int cwidth, cheight;
|
|
|
|
HRESULT hr = BitmapPixels.OpenBitmap(NULL, hbm, TRUE, &prgdwPixels, &cwidth, &cheight);
|
|
if (FAILED(hr))
|
|
return hr;
|
|
|
|
if (cx <= 0)
|
|
cx = cwidth;
|
|
|
|
if (cy <= 0)
|
|
cy = cheight;
|
|
|
|
HRGN hrgn = _PixelsToRgn(prgdwPixels, cxOffset, cyOffset, cx, cy, cwidth, cheight, fAlphaChannel,
|
|
iAlphaThreshold, rgbMask, nMaskTolerance);
|
|
if (! hrgn)
|
|
return MakeError32(E_FAIL); // unknown reason for failure
|
|
|
|
*phrgn = hrgn;
|
|
return S_OK;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
// Creates a region based on an arbitrary bitmap, transparency-keyed on a
|
|
// RGB value within a specified tolerance. The key value is optional (-1 ==
|
|
// use the value of the first pixel as the key).
|
|
//
|
|
HRGN WINAPI CreateScaledBitmapRgn(
|
|
HBITMAP hbm,
|
|
int cx,
|
|
int cy,
|
|
COLORREF rgbMask,
|
|
int nMaskTolerance )
|
|
{
|
|
HRGN hrgnRet = NULL;
|
|
BITMAP bm;
|
|
|
|
if( hbm && GetObject( hbm, sizeof(bm), &bm ) )
|
|
{
|
|
// Create a memory DC to do the pixel walk
|
|
HDC hdcMem = NULL;
|
|
if( (hdcMem = CreateCompatibleDC(NULL)) != NULL )
|
|
{
|
|
if( CX_USEDEFAULT == cx )
|
|
cx = bm.bmWidth;
|
|
if( CY_USEDEFAULT == cy )
|
|
cy = bm.bmHeight;
|
|
|
|
// Create a 32-bit empty bitmap for the walk
|
|
BITMAPINFO bmi;
|
|
ZeroMemory( &bmi, sizeof(bmi) );
|
|
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
|
|
bmi.bmiHeader.biWidth = cx;
|
|
bmi.bmiHeader.biHeight = cy;
|
|
bmi.bmiHeader.biPlanes = 1;
|
|
bmi.bmiHeader.biBitCount = 32;
|
|
bmi.bmiHeader.biCompression = BI_RGB; // uncompressed.
|
|
|
|
VOID* pvBits = NULL;
|
|
HBITMAP hbmMem = CreateDIBSection( hdcMem, &bmi, DIB_RGB_COLORS, &pvBits, NULL, NULL );
|
|
BITMAP bmMem;
|
|
|
|
if( hbmMem )
|
|
{
|
|
// Transfer the image to our 32-bit format for the pixel walk.
|
|
HBITMAP hbmMemOld = (HBITMAP)SelectObject( hdcMem, hbmMem );
|
|
HDC hdc = CreateCompatibleDC( hdcMem );
|
|
HBITMAP hbmOld = (HBITMAP)SelectObject( hdc, hbm );
|
|
|
|
StretchBlt( hdcMem, 0, 0, cx, cy,
|
|
hdc, 0, 0, bm.bmWidth, bm.bmHeight, SRCCOPY );
|
|
SelectObject( hdc, hbmOld );
|
|
DeleteDC( hdc );
|
|
|
|
GetObject( hbmMem, sizeof(bmMem), &bmMem );
|
|
ASSERT(bmMem.bmBitsPixel == 32);
|
|
ASSERT(bmMem.bmWidthBytes/bmMem.bmWidth == sizeof(DWORD));
|
|
LPDWORD pdwBits = (LPDWORD)bmMem.bmBits;
|
|
ASSERT(pdwBits != NULL);
|
|
|
|
hrgnRet = _PixelsToRgn(pdwBits, 0, 0, cx, cy, cx, cy, FALSE, 0, rgbMask, nMaskTolerance);
|
|
|
|
// Delete 32-bit memory bitmap
|
|
SelectObject( hdcMem, hbmMemOld );
|
|
DeleteObject( hbmMem );
|
|
}
|
|
// Delete memory DC
|
|
DeleteDC(hdcMem);
|
|
|
|
}
|
|
}
|
|
return hrgnRet;
|
|
}
|
|
//-------------------------------------------------------------------------//
|
|
// crete a region built up from rectangular tiles
|
|
HRGN WINAPI CreateTiledRectRgn(
|
|
IN HRGN hrgnSrc,
|
|
IN int cxSrc,
|
|
IN int cySrc,
|
|
IN int cxDest,
|
|
IN int cyDest )
|
|
{
|
|
HRGN hrgnBound = NULL; // return value
|
|
HRGN hrgnTile = _DupRgn( hrgnSrc );
|
|
|
|
if( hrgnTile )
|
|
{
|
|
// Build up an unplaced, unclipped composite
|
|
HRGN hrgnTmp = NULL;
|
|
for( int y = 0; y < cyDest; y += cySrc )
|
|
{
|
|
for( int x = 0; x < cxDest; x += cxSrc )
|
|
{
|
|
AddToCompositeRgn( &hrgnTmp, hrgnTile,
|
|
(x ? cxSrc : 0), (y ? cySrc : 0) );
|
|
}
|
|
}
|
|
|
|
if( NULL != hrgnTmp )
|
|
{
|
|
// Clip the composite to the specified rectangle
|
|
hrgnBound = CreateRectRgn( 0, 0, cxDest, cyDest );
|
|
if( hrgnBound )
|
|
{
|
|
|
|
if( ERROR == CombineRgn( hrgnBound, hrgnTmp, hrgnBound, RGN_AND ) )
|
|
{
|
|
DeleteObject( hrgnBound );
|
|
hrgnBound = NULL;
|
|
}
|
|
}
|
|
DeleteObject( hrgnTmp );
|
|
}
|
|
DeleteObject( hrgnTile );
|
|
}
|
|
return hrgnBound;
|
|
}
|
|
//-------------------------------------------------------------------------//
|
|
int WINAPI AddToCompositeRgn(
|
|
IN OUT HRGN* phrgnComposite,
|
|
IN OUT HRGN hrgnSrc,
|
|
IN int cxOffset,
|
|
IN int cyOffset )
|
|
{
|
|
int nRet = ERROR;
|
|
|
|
if( NULL != phrgnComposite && NULL != hrgnSrc )
|
|
{
|
|
nRet = OffsetRgn( hrgnSrc, cxOffset, cyOffset );
|
|
if( nRet != ERROR )
|
|
{
|
|
int nMode = RGN_OR;
|
|
if( NULL == *phrgnComposite )
|
|
{
|
|
*phrgnComposite = CreateRectRgn(0,0,1,1);
|
|
if( NULL == *phrgnComposite )
|
|
return ERROR;
|
|
nMode = RGN_COPY;
|
|
}
|
|
nRet = CombineRgn( *phrgnComposite, hrgnSrc, *phrgnComposite, nMode );
|
|
}
|
|
}
|
|
|
|
return nRet;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
// removes a rectangle from a region.
|
|
int WINAPI RemoveFromCompositeRgn(
|
|
HRGN hrgnDest,
|
|
LPCRECT prcRemove )
|
|
{
|
|
ASSERT(hrgnDest);
|
|
ASSERT(prcRemove);
|
|
ASSERT(!IsRectEmpty(prcRemove));
|
|
|
|
int nRet = ERROR;
|
|
|
|
RECT rc = *prcRemove;
|
|
HRGN hrgn;
|
|
if( (hrgn = CreateRectRgnIndirect( &rc )) != NULL )
|
|
{
|
|
nRet = CombineRgn( hrgnDest, hrgnDest, hrgn, RGN_DIFF );
|
|
DeleteObject( hrgn );
|
|
}
|
|
return nRet;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
HRGN WINAPI _DupRgn( HRGN hrgnSrc )
|
|
{
|
|
if( hrgnSrc )
|
|
{
|
|
HRGN hrgnDest = CreateRectRgn(0,0,1,1);
|
|
if (hrgnDest)
|
|
{
|
|
if (CombineRgn( hrgnDest, hrgnSrc, NULL, RGN_COPY ) )
|
|
return hrgnDest;
|
|
|
|
DeleteObject(hrgnDest);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------//
|
|
void FixMarginOverlaps(int szDest, int *pm1, int *pm2)
|
|
{
|
|
int szSrc = (*pm1 + *pm2);
|
|
|
|
if ((szSrc > szDest) && (szSrc > 0))
|
|
{
|
|
//---- reduce each but maintain ratio ----
|
|
*pm1 = int(.5 + float(*pm1 * szDest)/float(szSrc));
|
|
*pm2 = szDest - *pm1;
|
|
}
|
|
}
|
|
//-------------------------------------------------------------------------//
|
|
HRESULT _ScaleRectsAndCreateRegion(
|
|
RGNDATA *prd,
|
|
const RECT *prc,
|
|
MARGINS *pMargins,
|
|
SIZE *pszSrcImage,
|
|
HRGN *phrgn)
|
|
{
|
|
//---- note: "prd" is region data with the 2 points in each ----
|
|
//---- rectangle made relative to its grid. Also, after the points, ----
|
|
//---- there is a BYTE for each point signifying the grid id (0-8) ----
|
|
//---- that each point lies within. the grid is determined using ----
|
|
//---- the original region with the background "margins". This is ----
|
|
//---- done to make scaling the points as fast as possible. ----
|
|
|
|
if (! prd) // required
|
|
return MakeError32(E_POINTER);
|
|
|
|
//---- easy access variables ----
|
|
int lw = pMargins->cxLeftWidth;
|
|
int rw = pMargins->cxRightWidth;
|
|
int th = pMargins->cyTopHeight;
|
|
int bh = pMargins->cyBottomHeight;
|
|
|
|
int iDestW = WIDTH(*prc);
|
|
int iDestH = HEIGHT(*prc);
|
|
|
|
//---- prevent left/right dest margins from overlapping ----
|
|
FixMarginOverlaps(iDestW, &lw, &rw);
|
|
|
|
//---- prevent top/bottom dest margins from overlapping ----
|
|
FixMarginOverlaps(iDestH, &th, &bh);
|
|
|
|
int lwFrom = lw;
|
|
int rwFrom = pszSrcImage->cx - rw;
|
|
int thFrom = th;
|
|
int bhFrom = pszSrcImage->cy - bh;
|
|
|
|
int lwTo = prc->left + lw;
|
|
int rwTo = prc->right - rw;
|
|
int thTo = prc->top + th;
|
|
int bhTo = prc->bottom - bh;
|
|
|
|
//---- compute offsets & factors ----
|
|
int iLeftXOffset = prc->left;
|
|
int iMiddleXOffset = lwTo;
|
|
int iRightXOffset = rwTo;
|
|
|
|
int iTopYOffset = prc->top;
|
|
int iMiddleYOffset = thTo;
|
|
int iBottomYOffset = bhTo;
|
|
|
|
int iToMiddleWidth = rwTo - lwTo;
|
|
int iFromMiddleWidth = rwFrom - lwFrom;
|
|
int iToMiddleHeight = bhTo - thTo;
|
|
int iFromMiddleHeight = bhFrom - thFrom;
|
|
|
|
if (! iFromMiddleWidth) // avoid divide by zero
|
|
{
|
|
//--- map point to x=0 ----
|
|
iToMiddleWidth = 0;
|
|
iFromMiddleWidth = 1;
|
|
}
|
|
|
|
if (! iFromMiddleHeight) // avoid divide by zero
|
|
{
|
|
//--- map point to y=0 ----
|
|
iToMiddleHeight = 0;
|
|
iFromMiddleHeight = 1;
|
|
}
|
|
|
|
//---- clipping values for adjusted lw/rw/th/bh ----
|
|
int lwMaxVal = __max(lw - 1, 0);
|
|
int rwMinVal = __min(pMargins->cxRightWidth - rw, __max(pMargins->cxRightWidth-1, 0));
|
|
int thMaxVal = __max(th - 1, 0);
|
|
int bhMinVal = __min(pMargins->cyBottomHeight - bh, __max(pMargins->cyBottomHeight-1, 0));
|
|
|
|
//---- allocte a buffer for the new points (rects) ----
|
|
int newlen = sizeof(RGNDATAHEADER) + prd->rdh.nRgnSize; // same # of rects
|
|
BYTE *newData = (BYTE *)new BYTE[newlen];
|
|
|
|
RGNDATA *prdNew = (RGNDATA *)newData;
|
|
if (! prdNew)
|
|
return MakeError32(E_OUTOFMEMORY);
|
|
|
|
ZeroMemory(&prdNew->rdh, sizeof(prdNew->rdh));
|
|
|
|
prdNew->rdh.dwSize = sizeof(prdNew->rdh);
|
|
prdNew->rdh.iType = RDH_RECTANGLES;
|
|
int cRects = prd->rdh.nCount;
|
|
prdNew->rdh.nCount = cRects;
|
|
SetRect(&prdNew->rdh.rcBound, -1, -1, -1, -1);
|
|
|
|
//---- step thru our custom data (POINT + BYTE combos) ----
|
|
POINT *pt = (POINT *)prd->Buffer;
|
|
BYTE *pByte = (BYTE *)prd->Buffer + prd->rdh.nRgnSize;
|
|
int cPoints = 2 * cRects;
|
|
POINT *ptNew = (POINT *)prdNew->Buffer;
|
|
|
|
for (int i=0; i < cPoints; i++, pt++, pByte++, ptNew++) // transform each "point"
|
|
{
|
|
switch (*pByte)
|
|
{
|
|
//---- in the "don't scale" areas, we clip the translated values ----
|
|
//---- for the case where the destination areas are too small ----
|
|
//---- using the below "__min()" and "__max()" calls ----
|
|
|
|
//---- remember: each point has been made 0-relative to its grid ----
|
|
|
|
case GN_LEFTTOP: // left top
|
|
ptNew->x = __min(pt->x, lwMaxVal) + iLeftXOffset;
|
|
ptNew->y = __min(pt->y, thMaxVal) + iTopYOffset;
|
|
break;
|
|
|
|
case GN_MIDDLETOP: // middle top
|
|
ptNew->x = (pt->x*iToMiddleWidth)/iFromMiddleWidth + iMiddleXOffset;
|
|
ptNew->y = __min(pt->y, thMaxVal) + iTopYOffset;
|
|
break;
|
|
|
|
case GN_RIGHTTOP: // right top
|
|
ptNew->x = __max(pt->x, rwMinVal) + iRightXOffset;
|
|
ptNew->y = __min(pt->y, thMaxVal) + iTopYOffset;
|
|
break;
|
|
|
|
case GN_LEFTMIDDLE: // left middle
|
|
ptNew->x = __min(pt->x, lwMaxVal) + iLeftXOffset;
|
|
ptNew->y = (pt->y*iToMiddleHeight)/iFromMiddleHeight + iMiddleYOffset;
|
|
break;
|
|
|
|
case GN_MIDDLEMIDDLE: // middle middle
|
|
ptNew->x = (pt->x*iToMiddleWidth)/iFromMiddleWidth + iMiddleXOffset;
|
|
ptNew->y = (pt->y*iToMiddleHeight)/iFromMiddleHeight + iMiddleYOffset;
|
|
break;
|
|
|
|
case GN_RIGHTMIDDLE: // right middle
|
|
ptNew->x = __max(pt->x, rwMinVal) + iRightXOffset;
|
|
ptNew->y = (pt->y*iToMiddleHeight)/iFromMiddleHeight + iMiddleYOffset;
|
|
break;
|
|
|
|
case GN_LEFTBOTTOM: // left bottom
|
|
ptNew->x = __min(pt->x, lwMaxVal) + iLeftXOffset;
|
|
ptNew->y = __max(pt->y, bhMinVal) + iBottomYOffset;
|
|
break;
|
|
|
|
case GN_MIDDLEBOTTOM: // middle bottom
|
|
ptNew->x = (pt->x*iToMiddleWidth)/iFromMiddleWidth + iMiddleXOffset;
|
|
ptNew->y = __max(pt->y, bhMinVal) + iBottomYOffset;
|
|
break;
|
|
|
|
case GN_RIGHTBOTTOM: // right bottom
|
|
ptNew->x = __max(pt->x, rwMinVal) + iRightXOffset;
|
|
ptNew->y = __max(pt->y, bhMinVal) + iBottomYOffset;
|
|
break;
|
|
}
|
|
}
|
|
|
|
//---- compute bounding box of new region ----
|
|
RECT *pRect = (RECT *)prdNew->Buffer;
|
|
RECT newBox = {-1, -1, -1, -1};
|
|
|
|
for (i=0; i < cRects; i++, pRect++)
|
|
_InPlaceUnionRect(&newBox, pRect);
|
|
|
|
//---- create the new region ----
|
|
prdNew->rdh.rcBound = newBox;
|
|
HRGN hrgn = ExtCreateRegion(NULL, newlen, prdNew);
|
|
|
|
delete [] newData; // free prdNew (aka newdata)
|
|
if (! hrgn)
|
|
return MakeErrorLast();
|
|
|
|
*phrgn = hrgn;
|
|
return S_OK;
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------//
|
|
#ifdef DEBUG
|
|
void RegionDebug(
|
|
HRGN hrgn)
|
|
{
|
|
DWORD len = GetRegionData(hrgn, 0, NULL); // get required length
|
|
ATLASSERT(len);
|
|
|
|
RGNDATA *pRgnData = (RGNDATA *) new BYTE[len + sizeof(RGNDATAHEADER)];
|
|
DWORD len2 = GetRegionData(hrgn, len, pRgnData);
|
|
ASSERT(len == len2);
|
|
UNREFERENCED_PARAMETER(len2);
|
|
}
|
|
#endif
|