diff options
Diffstat (limited to 'win/tkWinRegion.c')
| -rw-r--r-- | win/tkWinRegion.c | 107 |
1 files changed, 62 insertions, 45 deletions
diff --git a/win/tkWinRegion.c b/win/tkWinRegion.c index c3914e2..7cbdb9d 100644 --- a/win/tkWinRegion.c +++ b/win/tkWinRegion.c @@ -1,14 +1,14 @@ -/* +/* * tkWinRegion.c -- * * Tk Region emulation code. * * Copyright (c) 1995 Sun Microsystems, Inc. * - * See the file "license.terms" for information on usage and redistribution - * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tkWinRegion.c,v 1.5 2004/10/26 14:07:57 patthoyts Exp $ + * RCS: @(#) $Id: tkWinRegion.c,v 1.6 2005/12/02 00:19:04 dkf Exp $ */ #include "tkWinInt.h" @@ -31,7 +31,7 @@ */ TkRegion -TkCreateRegion() +TkCreateRegion(void) { RECT rect; memset(&rect, 0, sizeof(RECT)); @@ -55,8 +55,8 @@ TkCreateRegion() */ void -TkDestroyRegion(r) - TkRegion r; +TkDestroyRegion( + TkRegion r) { DeleteObject((HRGN) r); } @@ -78,11 +78,12 @@ TkDestroyRegion(r) */ void -TkClipBox(r, rect_return) - TkRegion r; - XRectangle* rect_return; +TkClipBox( + TkRegion r, + XRectangle* rect_return) { RECT rect; + GetRgnBox((HRGN)r, &rect); rect_return->x = (short) rect.left; rect_return->y = (short) rect.top; @@ -107,10 +108,10 @@ TkClipBox(r, rect_return) */ void -TkIntersectRegion(sra, srb, dr_return) - TkRegion sra; - TkRegion srb; - TkRegion dr_return; +TkIntersectRegion( + TkRegion sra, + TkRegion srb, + TkRegion dr_return) { CombineRgn((HRGN) dr_return, (HRGN) sra, (HRGN) srb, RGN_AND); } @@ -132,13 +133,14 @@ TkIntersectRegion(sra, srb, dr_return) */ void -TkUnionRectWithRegion(rectangle, src_region, dest_region_return) - XRectangle* rectangle; - TkRegion src_region; - TkRegion dest_region_return; +TkUnionRectWithRegion( + XRectangle *rectangle, + TkRegion src_region, + TkRegion dest_region_return) { HRGN rectRgn = CreateRectRgn(rectangle->x, rectangle->y, rectangle->x + rectangle->width, rectangle->y + rectangle->height); + CombineRgn((HRGN) dest_region_return, (HRGN) src_region, (HRGN) rectRgn, RGN_OR); DeleteObject(rectRgn); @@ -149,8 +151,8 @@ TkUnionRectWithRegion(rectangle, src_region, dest_region_return) * * TkpBuildRegionFromAlphaData -- * - * Set up a rectangle of the given region based on the supplied - * alpha data. + * Set up a rectangle of the given region based on the supplied alpha + * data. * * Results: * None @@ -162,16 +164,17 @@ TkUnionRectWithRegion(rectangle, src_region, dest_region_return) */ void -TkpBuildRegionFromAlphaData(region, x, y, width, height, dataPtr, - pixelStride, lineStride) - TkRegion region; - unsigned int x, y; /* Where in region to update. */ - unsigned int width, height; /* Size of rectangle to update. */ - unsigned char *dataPtr; /* Data to read from. */ - unsigned int pixelStride; /* num bytes from one piece of alpha - * data to the next in the line. */ - unsigned int lineStride; /* num bytes from one line of alpha - * data to the next line. */ +TkpBuildRegionFromAlphaData( + TkRegion region, + unsigned int x, unsigned int y, + /* Where in region to update. */ + unsigned int width, unsigned int height, + /* Size of rectangle to update. */ + unsigned char *dataPtr, /* Data to read from. */ + unsigned int pixelStride, /* Num bytes from one piece of alpha data to + * the next in the line. */ + unsigned int lineStride) /* Num bytes from one line of alpha data to + * the next line. */ { unsigned char *lineDataPtr; unsigned int x1, y1, end; @@ -180,13 +183,20 @@ TkpBuildRegionFromAlphaData(region, x, y, width, height, dataPtr, for (y1 = 0; y1 < height; y1++) { lineDataPtr = dataPtr; for (x1 = 0; x1 < width; x1 = end) { - /* search for first non-transparent pixel */ + /* + * Search for first non-transparent pixel. + */ + while ((x1 < width) && !*lineDataPtr) { x1++; lineDataPtr += pixelStride; } end = x1; - /* search for first transparent pixel */ + + /* + * Search for first transparent pixel. + */ + while ((end < width) && *lineDataPtr) { end++; lineDataPtr += pixelStride; @@ -195,6 +205,7 @@ TkpBuildRegionFromAlphaData(region, x, y, width, height, dataPtr, /* * Manipulate Win32 regions directly; it's more efficient. */ + SetRectRgn(rectRgn, x+x1, y+y1, x+end, y+y1+1); CombineRgn((HRGN) region, (HRGN) region, rectRgn, RGN_OR); } @@ -213,9 +224,8 @@ TkpBuildRegionFromAlphaData(region, x, y, width, height, dataPtr, * Test whether a given rectangle overlaps with a region. * * Results: - * Returns RectanglePart or RectangleOut. Note that this is - * not a complete implementation since it doesn't test for - * RectangleIn. + * Returns RectanglePart or RectangleOut. Note that this is not a + * complete implementation since it doesn't test for RectangleIn. * * Side effects: * None. @@ -224,12 +234,11 @@ TkpBuildRegionFromAlphaData(region, x, y, width, height, dataPtr, */ int -TkRectInRegion(r, x, y, width, height) - TkRegion r; - int x; - int y; - unsigned int width; - unsigned int height; +TkRectInRegion( + TkRegion r, /* Region to inspect */ + int x, int y, /* Top-left of rectangle */ + unsigned int width, /* Width of rectangle */ + unsigned int height) /* Height of rectangle */ { RECT rect; rect.top = y; @@ -256,10 +265,18 @@ TkRectInRegion(r, x, y, width, height) */ void -TkSubtractRegion(sra, srb, dr_return) - TkRegion sra; - TkRegion srb; - TkRegion dr_return; +TkSubtractRegion( + TkRegion sra, + TkRegion srb, + TkRegion dr_return) { CombineRgn((HRGN) dr_return, (HRGN) sra, (HRGN) srb, RGN_DIFF); } + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |