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255 lines
6.4 KiB
C
255 lines
6.4 KiB
C
/* $TOG: miwideline.h /main/12 1998/02/09 14:49:26 kaleb $ */
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/*
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Copyright 1988, 1998 The Open Group
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All Rights Reserved.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* $XFree86: xc/programs/Xserver/mi/miwideline.h,v 1.7 1998/10/04 09:39:35 dawes Exp $ */
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/* Author: Keith Packard, MIT X Consortium */
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#ifndef MI_WIDELINE_H
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#define MI_WIDELINE_H 1
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#include "mispans.h"
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/*
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* interface data to span-merging polygon filler
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*/
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typedef struct _SpanData {
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SpanGroup fgGroup, bgGroup;
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} SpanDataRec, *SpanDataPtr;
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#define AppendSpanGroup(pGC, pixel, spanPtr, spanData) { \
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SpanGroup *group, *othergroup = NULL; \
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if (pixel->pixel == GDK_GC_FBDATA(pGC)->values.foreground.pixel) \
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{ \
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group = &spanData->fgGroup; \
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if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH) \
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othergroup = &spanData->bgGroup; \
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} \
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else \
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{ \
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group = &spanData->bgGroup; \
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othergroup = &spanData->fgGroup; \
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} \
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miAppendSpans (group, othergroup, spanPtr); \
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}
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/*
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* Polygon edge description for integer wide-line routines
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*/
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typedef struct _PolyEdge {
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int height; /* number of scanlines to process */
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int x; /* starting x coordinate */
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int stepx; /* fixed integral dx */
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int signdx; /* variable dx sign */
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int e; /* initial error term */
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int dy;
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int dx;
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} PolyEdgeRec, *PolyEdgePtr;
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#define SQSECANT 108.856472512142 /* 1/sin^2(11/2) - miter limit constant */
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/*
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* types for general polygon routines
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*/
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typedef struct _PolyVertex {
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double x, y;
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} PolyVertexRec, *PolyVertexPtr;
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typedef struct _PolySlope {
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int dx, dy;
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double k; /* x0 * dy - y0 * dx */
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} PolySlopeRec, *PolySlopePtr;
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/*
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* Line face description for caps/joins
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*/
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typedef struct _LineFace {
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double xa, ya;
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int dx, dy;
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int x, y;
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double k;
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} LineFaceRec, *LineFacePtr;
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/*
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* macros for polygon fillers
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*/
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#define MIPOLYRELOADLEFT if (!left_height && left_count) { \
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left_height = left->height; \
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left_x = left->x; \
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left_stepx = left->stepx; \
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left_signdx = left->signdx; \
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left_e = left->e; \
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left_dy = left->dy; \
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left_dx = left->dx; \
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--left_count; \
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++left; \
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}
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#define MIPOLYRELOADRIGHT if (!right_height && right_count) { \
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right_height = right->height; \
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right_x = right->x; \
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right_stepx = right->stepx; \
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right_signdx = right->signdx; \
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right_e = right->e; \
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right_dy = right->dy; \
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right_dx = right->dx; \
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--right_count; \
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++right; \
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}
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#define MIPOLYSTEPLEFT left_x += left_stepx; \
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left_e += left_dx; \
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if (left_e > 0) \
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{ \
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left_x += left_signdx; \
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left_e -= left_dy; \
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}
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#define MIPOLYSTEPRIGHT right_x += right_stepx; \
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right_e += right_dx; \
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if (right_e > 0) \
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{ \
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right_x += right_signdx; \
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right_e -= right_dy; \
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}
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#define MILINESETPIXEL(pDrawable, pGC, pixel, oldPixel) { \
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oldPixel = GDK_GC_FBDATA(pGC)->values.foreground; \
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if (pixel->pixel != oldPixel.pixel) { \
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gdk_gc_set_foreground(pGC, pixel); \
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} \
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}
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#define MILINERESETPIXEL(pDrawable, pGC, pixel, oldPixel) { \
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if (pixel->pixel != oldPixel.pixel) { \
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gdk_gc_set_foreground(pGC, &oldPixel); \
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} \
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}
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#ifndef ICEIL
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#ifdef NOINLINEICEIL
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#define ICEIL(x) ((int)ceil(x))
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#else
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#ifdef __GNUC__
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#define ICEIL ICIEL
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static __inline int ICEIL(x)
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double x;
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{
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int _cTmp = x;
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return ((x == _cTmp) || (x < 0.0)) ? _cTmp : _cTmp+1;
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}
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#else
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#define ICEIL(x) ((((x) == (_cTmp = (x))) || ((x) < 0.0)) ? _cTmp : _cTmp+1)
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#define ICEILTEMPDECL static int _cTmp;
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#endif
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#endif
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#endif
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extern void miFillPolyHelper(
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#if NeedFunctionPrototypes
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GdkDrawable* /*pDrawable*/,
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GdkGC* /*pGC*/,
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GdkColor * /*pixel*/,
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SpanDataPtr /*spanData*/,
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int /*y*/,
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int /*overall_height*/,
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PolyEdgePtr /*left*/,
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PolyEdgePtr /*right*/,
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int /*left_count*/,
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int /*right_count*/
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#endif
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);
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extern int miRoundJoinFace(
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#if NeedFunctionPrototypes
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LineFacePtr /*face*/,
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PolyEdgePtr /*edge*/,
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gboolean * /*leftEdge*/
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#endif
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);
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extern void miRoundJoinClip(
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#if NeedFunctionPrototypes
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LineFacePtr /*pLeft*/,
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LineFacePtr /*pRight*/,
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PolyEdgePtr /*edge1*/,
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PolyEdgePtr /*edge2*/,
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int * /*y1*/,
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int * /*y2*/,
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gboolean * /*left1*/,
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gboolean * /*left2*/
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#endif
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);
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extern int miRoundCapClip(
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#if NeedFunctionPrototypes
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LineFacePtr /*face*/,
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gboolean /*isInt*/,
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PolyEdgePtr /*edge*/,
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gboolean * /*leftEdge*/
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#endif
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);
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extern void miLineProjectingCap(
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#if NeedFunctionPrototypes
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GdkDrawable* /*pDrawable*/,
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GdkGC* /*pGC*/,
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GdkColor * /*pixel*/,
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SpanDataPtr /*spanData*/,
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LineFacePtr /*face*/,
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gboolean /*isLeft*/,
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double /*xorg*/,
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double /*yorg*/,
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gboolean /*isInt*/
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#endif
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);
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extern SpanDataPtr miSetupSpanData(
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#if NeedFunctionPrototypes
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GdkGC* /*pGC*/,
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SpanDataPtr /*spanData*/,
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int /*npt*/
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#endif
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);
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extern void miCleanupSpanData(
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#if NeedFunctionPrototypes
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GdkDrawable* /*pDrawable*/,
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GdkGC* /*pGC*/,
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SpanDataPtr /*spanData*/
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#endif
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);
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extern int miPolyBuildEdge(double x0, double y0, double k, int dx, int dy,
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int xi, int yi, int left, PolyEdgePtr edge);
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extern int miPolyBuildPoly(PolyVertexPtr vertices, PolySlopePtr slopes,
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int count, int xi, int yi, PolyEdgePtr left,
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PolyEdgePtr right, int *pnleft, int *pnright,
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int *h);
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#endif
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