47d73daa7a
git-svn-id: http://skia.googlecode.com/svn/trunk@7758 2bbb7eff-a529-9590-31e7-b0007b416f81
236 lines
8.7 KiB
C++
236 lines
8.7 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "CurveIntersection.h"
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#include "CurveUtilities.h"
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#include "EdgeWalker_Test.h"
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#include "Intersection_Tests.h"
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#include "Intersections.h"
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#include "TestUtilities.h"
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struct lineQuad {
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Quadratic quad;
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_Line line;
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int result;
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_Point expected[2];
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} lineQuadTests[] = {
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// quad line results
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{{{1, 1}, {2, 1}, {0, 2}}, {{0, 0}, {1, 1}}, 1, {{1, 1} }},
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{{{0, 0}, {1, 1}, {3, 1}}, {{0, 0}, {3, 1}}, 2, {{0, 0}, {3, 1}}},
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{{{2, 0}, {1, 1}, {2, 2}}, {{0, 0}, {0, 2}}, 0 },
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{{{4, 0}, {0, 1}, {4, 2}}, {{3, 1}, {4, 1}}, 0, },
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{{{0, 0}, {0, 1}, {1, 1}}, {{0, 1}, {1, 0}}, 1, {{.25, .75} }},
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};
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size_t lineQuadTests_count = sizeof(lineQuadTests) / sizeof(lineQuadTests[0]);
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const int firstLineQuadIntersectionTest = 0;
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static int doIntersect(Intersections& intersections, const Quadratic& quad, const _Line& line, bool& flipped) {
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int result;
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flipped = false;
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if (line[0].x == line[1].x) {
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double top = line[0].y;
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double bottom = line[1].y;
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flipped = top > bottom;
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if (flipped) {
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SkTSwap<double>(top, bottom);
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}
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result = verticalIntersect(quad, top, bottom, line[0].x, flipped, intersections);
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} else if (line[0].y == line[1].y) {
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double left = line[0].x;
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double right = line[1].x;
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flipped = left > right;
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if (flipped) {
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SkTSwap<double>(left, right);
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}
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result = horizontalIntersect(quad, left, right, line[0].y, flipped, intersections);
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} else {
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intersect(quad, line, intersections);
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result = intersections.fUsed;
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}
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return result;
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}
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static struct oneLineQuad {
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Quadratic quad;
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_Line line;
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} oneOffs[] = {
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{{{369.848602,145.680267}, {382.360413,121.298294}, {406.207703,121.298294}},
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{{406.207703,121.298294}, {348.781738,123.864815}}}
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};
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static size_t oneOffs_count = sizeof(oneOffs) / sizeof(oneOffs[0]);
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static void testOneOffs() {
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Intersections intersections;
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bool flipped = false;
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for (size_t index = 0; index < oneOffs_count; ++index) {
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const Quadratic& quad = oneOffs[index].quad;
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const _Line& line = oneOffs[index].line;
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int result = doIntersect(intersections, quad, line, flipped);
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for (int inner = 0; inner < result; ++inner) {
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double quadT = intersections.fT[0][inner];
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double quadX, quadY;
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xy_at_t(quad, quadT, quadX, quadY);
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double lineT = intersections.fT[1][inner];
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double lineX, lineY;
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xy_at_t(line, lineT, lineX, lineY);
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SkASSERT(AlmostEqualUlps(quadX, lineX)
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&& AlmostEqualUlps(quadY, lineY));
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}
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}
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}
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void LineQuadraticIntersection_Test() {
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if (1) {
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testOneOffs();
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}
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for (size_t index = firstLineQuadIntersectionTest; index < lineQuadTests_count; ++index) {
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const Quadratic& quad = lineQuadTests[index].quad;
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const _Line& line = lineQuadTests[index].line;
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Quadratic reduce1;
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_Line reduce2;
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int order1 = reduceOrder(quad, reduce1, kReduceOrder_TreatAsFill);
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int order2 = reduceOrder(line, reduce2);
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if (order1 < 3) {
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SkDebugf("%s [%d] quad order=%d\n", __FUNCTION__, (int) index, order1);
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SkASSERT(0);
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}
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if (order2 < 2) {
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SkDebugf("%s [%d] line order=%d\n", __FUNCTION__, (int) index, order2);
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SkASSERT(0);
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}
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Intersections intersections;
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bool flipped = false;
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int result = doIntersect(intersections, quad, line, flipped);
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SkASSERT(result == lineQuadTests[index].result);
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if (!intersections.intersected()) {
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continue;
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}
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for (int pt = 0; pt < result; ++pt) {
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double tt1 = intersections.fT[0][pt];
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SkASSERT(tt1 >= 0 && tt1 <= 1);
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_Point t1, t2;
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xy_at_t(quad, tt1, t1.x, t1.y);
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double tt2 = intersections.fT[1][pt];
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SkASSERT(tt2 >= 0 && tt2 <= 1);
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xy_at_t(line, tt2, t2.x, t2.y);
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if (!AlmostEqualUlps(t1.x, t2.x)) {
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SkDebugf("%s [%d,%d] x!= t1=%1.9g (%1.9g,%1.9g) t2=%1.9g (%1.9g,%1.9g)\n",
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__FUNCTION__, (int)index, pt, tt1, t1.x, t1.y, tt2, t2.x, t2.y);
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SkASSERT(0);
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}
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if (!AlmostEqualUlps(t1.y, t2.y)) {
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SkDebugf("%s [%d,%d] y!= t1=%1.9g (%1.9g,%1.9g) t2=%1.9g (%1.9g,%1.9g)\n",
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__FUNCTION__, (int)index, pt, tt1, t1.x, t1.y, tt2, t2.x, t2.y);
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SkASSERT(0);
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}
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if (!t1.approximatelyEqual(lineQuadTests[index].expected[0])
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&& (lineQuadTests[index].result == 1
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|| !t1.approximatelyEqual(lineQuadTests[index].expected[1]))) {
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SkDebugf("%s t1=(%1.9g,%1.9g)\n", __FUNCTION__, t1.x, t1.y);
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SkASSERT(0);
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}
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}
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}
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}
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static void testLineIntersect(State4& state, const Quadratic& quad, const _Line& line,
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const double x, const double y) {
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char pathStr[1024];
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bzero(pathStr, sizeof(pathStr));
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char* str = pathStr;
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str += sprintf(str, " path.moveTo(%1.9g, %1.9g);\n", quad[0].x, quad[0].y);
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str += sprintf(str, " path.quadTo(%1.9g, %1.9g, %1.9g, %1.9g);\n", quad[1].x, quad[1].y, quad[2].x, quad[2].y);
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str += sprintf(str, " path.moveTo(%1.9g, %1.9g);\n", line[0].x, line[0].y);
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str += sprintf(str, " path.lineTo(%1.9g, %1.9g);\n", line[1].x, line[1].y);
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Intersections intersections;
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bool flipped = false;
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int result = doIntersect(intersections, quad, line, flipped);
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bool found = false;
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for (int index = 0; index < result; ++index) {
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double quadT = intersections.fT[0][index];
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double quadX, quadY;
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xy_at_t(quad, quadT, quadX, quadY);
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double lineT = intersections.fT[1][index];
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double lineX, lineY;
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xy_at_t(line, lineT, lineX, lineY);
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if (fabs(quadX - lineX) < FLT_EPSILON && fabs(quadY - lineY) < FLT_EPSILON
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&& fabs(x - lineX) < FLT_EPSILON && fabs(y - lineY) < FLT_EPSILON) {
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found = true;
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}
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}
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SkASSERT(found);
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state.testsRun++;
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}
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// find a point on a quad by choosing a t from 0 to 1
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// create a vertical span above and below the point
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// verify that intersecting the vertical span and the quad returns t
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// verify that a vertical span starting at quad[0] intersects at t=0
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// verify that a vertical span starting at quad[2] intersects at t=1
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static void* testQuadLineIntersectMain(void* data)
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{
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SkASSERT(data);
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State4& state = *(State4*) data;
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do {
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int ax = state.a & 0x03;
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int ay = state.a >> 2;
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int bx = state.b & 0x03;
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int by = state.b >> 2;
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int cx = state.c & 0x03;
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int cy = state.c >> 2;
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Quadratic quad = {{ax, ay}, {bx, by}, {cx, cy}};
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Quadratic reduced;
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int order = reduceOrder(quad, reduced, kReduceOrder_TreatAsFill);
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if (order < 3) {
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continue; // skip degenerates
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}
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for (int tIndex = 0; tIndex <= 4; ++tIndex) {
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double x, y;
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xy_at_t(quad, tIndex / 4.0, x, y);
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for (int h = -2; h <= 2; ++h) {
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for (int v = -2; v <= 2; ++v) {
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if (h == v && abs(h) != 1) {
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continue;
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}
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_Line line = {{x - h, y - v}, {x, y}};
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testLineIntersect(state, quad, line, x, y);
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_Line line2 = {{x, y}, {x + h, y + v}};
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testLineIntersect(state, quad, line2, x, y);
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_Line line3 = {{x - h, y - v}, {x + h, y + v}};
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testLineIntersect(state, quad, line3, x, y);
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}
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}
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}
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} while (runNextTestSet(state));
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return NULL;
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}
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void QuadLineIntersectThreaded_Test(int& testsRun)
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{
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SkDebugf("%s\n", __FUNCTION__);
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const char testStr[] = "testQuadLineIntersect";
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initializeTests(testStr, sizeof(testStr));
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int testsStart = testsRun;
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for (int a = 0; a < 16; ++a) {
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for (int b = 0 ; b < 16; ++b) {
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for (int c = 0 ; c < 16; ++c) {
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testsRun += dispatchTest4(testQuadLineIntersectMain,
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a, b, c, 0);
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}
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if (!gRunTestsInOneThread) SkDebugf(".");
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}
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if (!gRunTestsInOneThread) SkDebugf("%d", a);
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}
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testsRun += waitForCompletion();
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SkDebugf("\n%s tests=%d total=%d\n", __FUNCTION__, testsRun - testsStart, testsRun);
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}
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