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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "PathOpsExtendedTest.h"
#include "PathOpsThreadedCommon.h"
#include "SkIntersections.h"
#include "SkPathOpsLine.h"
#include "SkPathOpsQuad.h"
#include "SkReduceOrder.h"
static int doIntersect(SkIntersections& intersections, const SkDQuad& quad, const SkDLine& line,
bool& flipped) {
int result;
flipped = false;
if (line[0].fX == line[1].fX) {
double top = line[0].fY;
double bottom = line[1].fY;
flipped = top > bottom;
if (flipped) {
SkTSwap<double>(top, bottom);
}
result = intersections.vertical(quad, top, bottom, line[0].fX, flipped);
} else if (line[0].fY == line[1].fY) {
double left = line[0].fX;
double right = line[1].fX;
flipped = left > right;
if (flipped) {
SkTSwap<double>(left, right);
}
result = intersections.horizontal(quad, left, right, line[0].fY, flipped);
} else {
intersections.intersect(quad, line);
result = intersections.used();
}
return result;
}
static void testLineIntersect(skiatest::Reporter* reporter, const SkDQuad& quad,
const SkDLine& line, const double x, const double y) {
char pathStr[1024];
sk_bzero(pathStr, sizeof(pathStr));
char* str = pathStr;
str += sprintf(str, " path.moveTo(%1.9g, %1.9g);\n", quad[0].fX, quad[0].fY);
str += sprintf(str, " path.quadTo(%1.9g, %1.9g, %1.9g, %1.9g);\n", quad[1].fX,
quad[1].fY, quad[2].fX, quad[2].fY);
str += sprintf(str, " path.moveTo(%1.9g, %1.9g);\n", line[0].fX, line[0].fY);
str += sprintf(str, " path.lineTo(%1.9g, %1.9g);\n", line[1].fX, line[1].fY);
SkIntersections intersections;
bool flipped = false;
int result = doIntersect(intersections, quad, line, flipped);
bool found = false;
for (int index = 0; index < result; ++index) {
double quadT = intersections[0][index];
SkDPoint quadXY = quad.ptAtT(quadT);
double lineT = intersections[1][index];
SkDPoint lineXY = line.ptAtT(lineT);
if (quadXY.approximatelyEqual(lineXY)) {
found = true;
}
}
REPORTER_ASSERT(reporter, found);
}
// find a point on a quad by choosing a t from 0 to 1
// create a vertical span above and below the point
// verify that intersecting the vertical span and the quad returns t
// verify that a vertical span starting at quad[0] intersects at t=0
// verify that a vertical span starting at quad[2] intersects at t=1
static void testQuadLineIntersectMain(PathOpsThreadState* data)
{
PathOpsThreadState& state = *data;
REPORTER_ASSERT(state.fReporter, data);
int ax = state.fA & 0x03;
int ay = state.fA >> 2;
int bx = state.fB & 0x03;
int by = state.fB >> 2;
int cx = state.fC & 0x03;
int cy = state.fC >> 2;
SkDQuad quad = {{{(double) ax, (double) ay}, {(double) bx, (double) by},
{(double) cx, (double) cy}}};
SkReduceOrder reducer;
int order = reducer.reduce(quad);
if (order < 3) {
return;
}
for (int tIndex = 0; tIndex <= 4; ++tIndex) {
SkDPoint xy = quad.ptAtT(tIndex / 4.0);
for (int h = -2; h <= 2; ++h) {
for (int v = -2; v <= 2; ++v) {
if (h == v && abs(h) != 1) {
continue;
}
double x = xy.fX;
double y = xy.fY;
SkDLine line = {{{x - h, y - v}, {x, y}}};
testLineIntersect(state.fReporter, quad, line, x, y);
state.fReporter->bumpTestCount();
SkDLine line2 = {{{x, y}, {x + h, y + v}}};
testLineIntersect(state.fReporter, quad, line2, x, y);
state.fReporter->bumpTestCount();
SkDLine line3 = {{{x - h, y - v}, {x + h, y + v}}};
testLineIntersect(state.fReporter, quad, line3, x, y);
state.fReporter->bumpTestCount();
}
}
}
}
DEF_TEST(PathOpsQuadLineIntersectionThreaded, reporter) {
initializeTests(reporter, "testQuadLineIntersect");
PathOpsThreadedTestRunner testRunner(reporter);
for (int a = 0; a < 16; ++a) {
for (int b = 0 ; b < 16; ++b) {
for (int c = 0 ; c < 16; ++c) {
*testRunner.fRunnables.append() = SkNEW_ARGS(PathOpsThreadedRunnable,
(&testQuadLineIntersectMain, a, b, c, 0, &testRunner));
}
if (!reporter->allowExtendedTest()) goto finish;
}
}
finish:
testRunner.render();
}
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