/*
* Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#ifndef LineUtils_h_Included
#define LineUtils_h_Included
#define SIGNED(d, v) (((d) < 0) ? (-((jint) (v))) : ((jint) (v)))
#define SWAP(a, b, t) do { jint t = a; a = b; b = t; } while (0)
#define SETORDERED(a,b,min,max, shorten) \
do { \
if (a < b) { \
min = a; \
max = b - shorten; \
} else { \
min = b + shorten; \
max = a; \
} \
} while (0)
#define BUMP_NOOP 0x0
#define BUMP_POS_PIXEL 0x1
#define BUMP_NEG_PIXEL 0x2
#define BUMP_POS_SCAN 0x4
#define BUMP_NEG_SCAN 0x8
extern jboolean LineUtils_SetupBresenham(jint x1, jint y1, jint x2, jint y2,
jint shorten,
SurfaceDataBounds *pBounds,
jint *pStartX, jint *pStartY,
jint *pSteps, jint *pError,
jint *pErrMajor, jint *pBumpMajorMask,
jint *pErrMinor, jint *pBumpMinorMask);
#define LineUtils_ProcessLine(pRasInfo, pixel, pLine, pPrim, pCompInfo, \
X1, Y1, X2, Y2, shorten) \
do { \
jint tx1, ty1, tx2, ty2; \
if (Y1 == Y2) { \
if (Y1 >= (pRasInfo)->bounds.y1 && Y1 < (pRasInfo)->bounds.y2) { \
SETORDERED(X1, X2, tx1, tx2, shorten); \
if (++tx2 < tx1) --tx2; /* integer overflow */ \
if (tx1 < (pRasInfo)->bounds.x1) tx1 = (pRasInfo)->bounds.x1; \
if (tx2 > (pRasInfo)->bounds.x2) tx2 = (pRasInfo)->bounds.x2; \
if (tx1 < tx2) { \
(*pLine)((pRasInfo), tx1, Y1, pixel, tx2 - tx1, 0, \
BUMP_POS_PIXEL, 0, \
BUMP_NOOP, 0, pPrim, pCompInfo); \
} \
} \
} else if (X1 == X2) { \
if (X1 >= (pRasInfo)->bounds.x1 && X1 < (pRasInfo)->bounds.x2) { \
SETORDERED(Y1, Y2, ty1, ty2, shorten); \
if (++ty2 < ty1) --ty2; /* integer overflow */ \
if (ty1 < (pRasInfo)->bounds.y1) ty1 = (pRasInfo)->bounds.y1; \
if (ty2 > (pRasInfo)->bounds.y2) ty2 = (pRasInfo)->bounds.y2; \
if (ty1 < ty2) { \
(*pLine)((pRasInfo), X1, ty1, pixel, ty2 - ty1, 0, \
BUMP_POS_SCAN, 0, \
BUMP_NOOP, 0, pPrim, pCompInfo); \
} \
} \
} else { \
jint steps; \
jint error; \
jint errmajor, errminor; \
jint bumpmajormask, bumpminormask; \
if (LineUtils_SetupBresenham(X1, Y1, X2, Y2, shorten, \
&(pRasInfo)->bounds, \
&tx1, &ty1, \
/**代码未完, 请加载全部代码(NowJava.com).**/