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gdi32: Add helpers to allocate, grow and free regions. 

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Huw Davies 2016-07-18 11:32:26 +01:00 committed by Alexandre Julliard
parent 8185c9f024
commit 01c33fb983
1 changed files with 101 additions and 85 deletions
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186
dlls/gdi32/region.c
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@ -125,16 +125,25 @@ static inline BOOL overlapping( const RECT *r1, const RECT *r2 )
r1->bottom > r2->top && r1->top < r2->bottom);
}
static BOOL grow_region( WINEREGION *rgn, int size )
{
RECT *new_rects;
if (size <= rgn->size) return TRUE;
new_rects = HeapReAlloc( GetProcessHeap(), 0, rgn->rects, size * sizeof(RECT) );
if (!new_rects) return FALSE;
rgn->rects = new_rects;
rgn->size = size;
return TRUE;
}
static BOOL add_rect( WINEREGION *reg, INT left, INT top, INT right, INT bottom )
{
RECT *rect;
if (reg->numRects >= reg->size)
{
RECT *newrects = HeapReAlloc( GetProcessHeap(), 0, reg->rects, 2 * sizeof(RECT) * reg->size );
if (!newrects) return FALSE;
reg->rects = newrects;
reg->size *= 2;
}
if (reg->numRects >= reg->size && !grow_region( reg, 2 * reg->size ))
return FALSE;
rect = reg->rects + reg->numRects++;
rect->left = left;
rect->top = top;
@ -450,6 +459,46 @@ static void destroy_region( WINEREGION *pReg )
HeapFree( GetProcessHeap(), 0, pReg->rects );
}
/***********************************************************************
* free_region
*/
static void free_region( WINEREGION *rgn )
{
destroy_region( rgn );
HeapFree( GetProcessHeap(), 0, rgn );
}
/***********************************************************************
* alloc_region
*/
static WINEREGION *alloc_region( INT n )
{
WINEREGION *rgn = HeapAlloc( GetProcessHeap(), 0, sizeof(*rgn) );
if (rgn && !init_region( rgn, n ))
{
free_region( rgn );
rgn = NULL;
}
return rgn;
}
/************************************************************
* move_rects
*
* Move rectangles from src to dst leaving src with no rectangles.
*/
static inline void move_rects( WINEREGION *dst, WINEREGION *src )
{
destroy_region( dst );
dst->rects = src->rects;
dst->size = src->size;
dst->numRects = src->numRects;
src->rects = NULL;
src->size = 0;
src->numRects = 0;
}
/***********************************************************************
* REGION_DeleteObject
*/
@ -458,8 +507,7 @@ static BOOL REGION_DeleteObject( HGDIOBJ handle )
WINEREGION *rgn = free_gdi_handle( handle );
if (!rgn) return FALSE;
HeapFree( GetProcessHeap(), 0, rgn->rects );
HeapFree( GetProcessHeap(), 0, rgn );
free_region( rgn );
return TRUE;
}
@ -595,18 +643,11 @@ HRGN WINAPI CreateRectRgn(INT left, INT top, INT right, INT bottom)
HRGN hrgn;
WINEREGION *obj;
if (!(obj = HeapAlloc( GetProcessHeap(), 0, sizeof(*obj) ))) return 0;
if (!(obj = alloc_region( RGN_DEFAULT_RECTS ))) return 0;
/* Allocate 2 rects by default to reduce the number of reallocs */
if (!init_region( obj, RGN_DEFAULT_RECTS ))
{
HeapFree( GetProcessHeap(), 0, obj );
return 0;
}
if (!(hrgn = alloc_gdi_handle( obj, OBJ_REGION, &region_funcs )))
{
HeapFree( GetProcessHeap(), 0, obj->rects );
HeapFree( GetProcessHeap(), 0, obj );
free_region( obj );
return 0;
}
TRACE( "%d,%d-%d,%d returning %p\n", left, top, right, bottom, hrgn );
@ -727,16 +768,13 @@ HRGN WINAPI CreateRoundRectRgn( INT left, INT top,
if ((ellipse_width < 2) || (ellipse_height < 2))
return CreateRectRgn( left, top, right, bottom );
if (!(obj = HeapAlloc( GetProcessHeap(), 0, sizeof(*obj) ))) return 0;
obj->size = ellipse_height;
if (!(obj = alloc_region( ellipse_height ))) return 0;
obj->numRects = ellipse_height;
obj->extents.left = left;
obj->extents.top = top;
obj->extents.right = right;
obj->extents.bottom = bottom;
obj->rects = rects = HeapAlloc( GetProcessHeap(), 0, obj->size * sizeof(RECT) );
if (!rects) goto done;
rects = obj->rects;
/* based on an algorithm by Alois Zingl */
@ -788,12 +826,7 @@ HRGN WINAPI CreateRoundRectRgn( INT left, INT top,
TRACE("(%d,%d-%d,%d %dx%d): ret=%p\n",
left, top, right, bottom, ellipse_width, ellipse_height, hrgn );
done:
if (!hrgn)
{
HeapFree( GetProcessHeap(), 0, obj->rects );
HeapFree( GetProcessHeap(), 0, obj );
}
if (!hrgn) free_region( obj );
return hrgn;
}
@ -941,6 +974,7 @@ HRGN WINAPI ExtCreateRegion( const XFORM* lpXform, DWORD dwCount, const RGNDATA*
{
HRGN hrgn = 0;
WINEREGION *obj;
const RECT *pCurRect, *pEndRect;
if (!rgndata)
{
@ -985,34 +1019,21 @@ HRGN WINAPI ExtCreateRegion( const XFORM* lpXform, DWORD dwCount, const RGNDATA*
return hrgn;
}
if (!(obj = HeapAlloc( GetProcessHeap(), 0, sizeof(*obj) ))) return 0;
if (!(obj = alloc_region( rgndata->rdh.nCount ))) return 0;
if (init_region( obj, rgndata->rdh.nCount ))
pEndRect = (const RECT *)rgndata->Buffer + rgndata->rdh.nCount;
for(pCurRect = (const RECT *)rgndata->Buffer; pCurRect < pEndRect; pCurRect++)
{
const RECT *pCurRect, *pEndRect;
pEndRect = (const RECT *)rgndata->Buffer + rgndata->rdh.nCount;
for(pCurRect = (const RECT *)rgndata->Buffer; pCurRect < pEndRect; pCurRect++)
if (pCurRect->left < pCurRect->right && pCurRect->top < pCurRect->bottom)
{
if (pCurRect->left < pCurRect->right && pCurRect->top < pCurRect->bottom)
{
if (!REGION_UnionRectWithRegion( pCurRect, obj )) goto done;
}
if (!REGION_UnionRectWithRegion( pCurRect, obj )) goto done;
}
hrgn = alloc_gdi_handle( obj, OBJ_REGION, &region_funcs );
}
else
{
HeapFree( GetProcessHeap(), 0, obj );
return 0;
}
hrgn = alloc_gdi_handle( obj, OBJ_REGION, &region_funcs );
done:
if (!hrgn)
{
HeapFree( GetProcessHeap(), 0, obj->rects );
HeapFree( GetProcessHeap(), 0, obj );
}
if (!hrgn) free_region( obj );
TRACE("%p %d %p returning %p\n", lpXform, dwCount, rgndata, hrgn );
return hrgn;
}
@ -1207,7 +1228,7 @@ BOOL REGION_FrameRgn( HRGN hDest, HRGN hSrc, INT x, INT y )
bRet = TRUE;
}
done:
HeapFree( GetProcessHeap(), 0, tmprgn.rects );
destroy_region( &tmprgn );
if (destObj) GDI_ReleaseObj ( hDest );
GDI_ReleaseObj( hSrc );
return bRet;
@ -1354,13 +1375,9 @@ static BOOL REGION_CopyRegion(WINEREGION *dst, WINEREGION *src)
{
if (dst != src) /* don't want to copy to itself */
{
if (dst->size < src->numRects)
{
RECT *rects = HeapReAlloc( GetProcessHeap(), 0, dst->rects, src->numRects * sizeof(RECT) );
if (!rects) return FALSE;
dst->rects = rects;
dst->size = src->numRects;
}
if (dst->size < src->numRects && !grow_region( dst, src->numRects ))
return FALSE;
dst->numRects = src->numRects;
dst->extents.left = src->extents.left;
dst->extents.top = src->extents.top;
@ -1378,9 +1395,21 @@ static BOOL REGION_MirrorRegion( WINEREGION *dst, WINEREGION *src, int width )
{
int i, start, end;
RECT extents;
RECT *rects = HeapAlloc( GetProcessHeap(), 0, src->numRects * sizeof(RECT) );
RECT *rects;
WINEREGION tmp;
if (!rects) return FALSE;
if (dst != src)
{
if (!grow_region( dst, src->numRects )) return FALSE;
rects = dst->rects;
dst->numRects = src->numRects;
}
else
{
if (!init_region( &tmp, src->numRects )) return FALSE;
rects = tmp.rects;
tmp.numRects = src->numRects;
}
extents.left = width - src->extents.right;
extents.right = width - src->extents.left;
@ -1402,11 +1431,10 @@ static BOOL REGION_MirrorRegion( WINEREGION *dst, WINEREGION *src, int width )
}
}
HeapFree( GetProcessHeap(), 0, dst->rects );
dst->rects = rects;
dst->size = src->numRects;
dst->numRects = src->numRects;
dst->extents = extents;
if (dst == src)
move_rects( dst, &tmp );
dst->extents = extents;
return TRUE;
}
@ -1850,10 +1878,7 @@ static BOOL REGION_RegionOp(
}
REGION_compact( &newReg );
HeapFree( GetProcessHeap(), 0, destReg->rects );
destReg->rects = newReg.rects;
destReg->size = newReg.size;
destReg->numRects = newReg.numRects;
move_rects( destReg, &newReg );
return TRUE;
}
@ -2581,18 +2606,18 @@ static void REGION_FreeStorage(ScanLineListBlock *pSLLBlock)
*
* Create an array of rectangles from a list of points.
*/
static BOOL REGION_PtsToRegion( struct point_block *FirstPtBlock, WINEREGION *reg )
static WINEREGION *REGION_PtsToRegion( struct point_block *FirstPtBlock )
{
POINT *pts;
struct point_block *pb;
int i, size, cur_band = 0, prev_band = 0;
RECT *extents;
extents = &reg->extents;
WINEREGION *reg;
for (pb = FirstPtBlock, size = 0; pb; pb = pb->next) size += pb->count;
if (!init_region( reg, size )) return FALSE;
if (!(reg = alloc_region( size ))) return NULL;
extents = &reg->extents;
extents->left = LARGE_COORDINATE, extents->right = SMALL_COORDINATE;
for (pb = FirstPtBlock; pb; pb = pb->next)
@ -2629,7 +2654,7 @@ static BOOL REGION_PtsToRegion( struct point_block *FirstPtBlock, WINEREGION *re
}
REGION_compact( reg );
return TRUE;
return reg;
}
/***********************************************************************
@ -2758,18 +2783,9 @@ HRGN WINAPI CreatePolyPolygonRgn(const POINT *Pts, const INT *Count,
}
}
if (!(obj = HeapAlloc( GetProcessHeap(), 0, sizeof(*obj) ))) goto done;
if (!REGION_PtsToRegion(&FirstPtBlock, obj))
{
HeapFree( GetProcessHeap(), 0, obj );
goto done;
}
if (!(obj = REGION_PtsToRegion( &FirstPtBlock ))) goto done;
if (!(hrgn = alloc_gdi_handle( obj, OBJ_REGION, &region_funcs )))
{
HeapFree( GetProcessHeap(), 0, obj->rects );
HeapFree( GetProcessHeap(), 0, obj );
}
free_region( obj );
done:
REGION_FreeStorage(SLLBlock.next);