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gdi32: Move the intersection of vis rects into a separate function.

This commit is contained in:
Huw Davies 2011-10-17 15:46:05 +01:00 committed by Alexandre Julliard
parent 2127e9444d
commit 64f6e9bc58
2 changed files with 58 additions and 48 deletions
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103
dlls/gdi32/bitblt.c
View File

@ -47,6 +47,60 @@ static inline void swap_ints( int *i, int *j )
*j = tmp;
}
BOOL intersect_vis_rectangles( struct bitblt_coords *dst, struct bitblt_coords *src )
{
RECT rect;
/* intersect the rectangles */
if ((src->width == dst->width) && (src->height == dst->height)) /* no stretching */
{
offset_rect( &src->visrect, dst->x - src->x, dst->y - src->y );
intersect_rect( &rect, &src->visrect, &dst->visrect );
src->visrect = dst->visrect = rect;
offset_rect( &src->visrect, src->x - dst->x, src->y - dst->y );
}
else /* stretching */
{
/* map source rectangle into destination coordinates */
rect = src->visrect;
offset_rect( &rect, -min( src->x, src->x + src->width + 1),
-min( src->y, src->y + src->height + 1) );
rect.left = dst->x + rect.left * dst->width / abs(src->width);
rect.top = dst->y + rect.top * dst->height / abs(src->height);
rect.right = dst->x + rect.right * dst->width / abs(src->width);
rect.bottom = dst->y + rect.bottom * dst->height / abs(src->height);
if (rect.left > rect.right) swap_ints( &rect.left, &rect.right );
if (rect.top > rect.bottom) swap_ints( &rect.top, &rect.bottom );
/* avoid rounding errors */
rect.left--;
rect.top--;
rect.right++;
rect.bottom++;
if (!intersect_rect( &dst->visrect, &rect, &dst->visrect )) return FALSE;
/* map destination rectangle back to source coordinates */
rect = dst->visrect;
offset_rect( &rect, -min( dst->x, dst->x + dst->width + 1),
-min( dst->y, dst->y + dst->height + 1) );
rect.left = src->x + rect.left * src->width / abs(dst->width);
rect.top = src->y + rect.top * src->height / abs(dst->height);
rect.right = src->x + rect.right * src->width / abs(dst->width);
rect.bottom = src->y + rect.bottom * src->height / abs(dst->height);
if (rect.left > rect.right) swap_ints( &rect.left, &rect.right );
if (rect.top > rect.bottom) swap_ints( &rect.top, &rect.bottom );
/* avoid rounding errors */
rect.left--;
rect.top--;
rect.right++;
rect.bottom++;
if (!intersect_rect( &src->visrect, &rect, &src->visrect )) return FALSE;
}
return TRUE;
}
static BOOL get_vis_rectangles( DC *dc_dst, struct bitblt_coords *dst,
DC *dc_src, struct bitblt_coords *src )
{
@ -104,54 +158,7 @@ static BOOL get_vis_rectangles( DC *dc_dst, struct bitblt_coords *dst,
if (is_rect_empty( &src->visrect )) return FALSE;
if (is_rect_empty( &dst->visrect )) return FALSE;
/* intersect the rectangles */
if ((src->width == dst->width) && (src->height == dst->height)) /* no stretching */
{
offset_rect( &src->visrect, dst->x - src->x, dst->y - src->y );
intersect_rect( &rect, &src->visrect, &dst->visrect );
src->visrect = dst->visrect = rect;
offset_rect( &src->visrect, src->x - dst->x, src->y - dst->y );
}
else /* stretching */
{
/* map source rectangle into destination coordinates */
rect = src->visrect;
offset_rect( &rect, -min( src->x, src->x + src->width + 1),
-min( src->y, src->y + src->height + 1) );
rect.left = dst->x + rect.left * dst->width / abs(src->width);
rect.top = dst->y + rect.top * dst->height / abs(src->height);
rect.right = dst->x + rect.right * dst->width / abs(src->width);
rect.bottom = dst->y + rect.bottom * dst->height / abs(src->height);
if (rect.left > rect.right) swap_ints( &rect.left, &rect.right );
if (rect.top > rect.bottom) swap_ints( &rect.top, &rect.bottom );
/* avoid rounding errors */
rect.left--;
rect.top--;
rect.right++;
rect.bottom++;
if (!intersect_rect( &dst->visrect, &rect, &dst->visrect )) return FALSE;
/* map destination rectangle back to source coordinates */
rect = dst->visrect;
offset_rect( &rect, -min( dst->x, dst->x + dst->width + 1),
-min( dst->y, dst->y + dst->height + 1) );
rect.left = src->x + rect.left * src->width / abs(dst->width);
rect.top = src->y + rect.top * src->height / abs(dst->height);
rect.right = src->x + rect.right * src->width / abs(dst->width);
rect.bottom = src->y + rect.bottom * src->height / abs(dst->height);
if (rect.left > rect.right) swap_ints( &rect.left, &rect.right );
if (rect.top > rect.bottom) swap_ints( &rect.top, &rect.bottom );
/* avoid rounding errors */
rect.left--;
rect.top--;
rect.right++;
rect.bottom++;
if (!intersect_rect( &src->visrect, &rect, &src->visrect )) return FALSE;
}
return TRUE;
return intersect_vis_rectangles( dst, src );
}
void free_heap_bits( struct gdi_image_bits *bits )

3
dlls/gdi32/gdi_private.h
View File

@ -222,6 +222,9 @@ typedef struct tagBITMAPOBJ
extern BOOL BIDI_Reorder( HDC hDC, LPCWSTR lpString, INT uCount, DWORD dwFlags, DWORD dwWineGCP_Flags,
LPWSTR lpOutString, INT uCountOut, UINT *lpOrder, WORD **lpGlyphs, INT* cGlyphs ) DECLSPEC_HIDDEN;
/* bitblt.c */
extern BOOL intersect_vis_rectangles( struct bitblt_coords *dst, struct bitblt_coords *src ) DECLSPEC_HIDDEN;
/* bitmap.c */
extern void get_ddb_bitmapinfo( BITMAPOBJ *bmp, BITMAPINFO *info ) DECLSPEC_HIDDEN;
extern BOOL get_bitmap_image( HBITMAP hbitmap, BITMAPINFO *info, struct gdi_image_bits *bits ) DECLSPEC_HIDDEN;