gecko-dev/gfx/tests/gtest/TestRegion.cpp

541 lines
14 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <algorithm>
#include "gtest/gtest.h"
#include "nsRegion.h"
using namespace std;
class TestLargestRegion {
public:
static void TestSingleRect(nsRect r) {
nsRegion region(r);
EXPECT_TRUE(region.GetLargestRectangle().IsEqualInterior(r));
}
// Construct a rectangle, remove part of it, then check the remainder
static void TestNonRectangular() {
nsRegion r(nsRect(0, 0, 30, 30));
const int nTests = 19;
struct {
nsRect rect;
int64_t expectedArea;
} tests[nTests] = {
// Remove a 20x10 chunk from the square
{ nsRect(0, 0, 20, 10), 600 },
{ nsRect(10, 0, 20, 10), 600 },
{ nsRect(10, 20, 20, 10), 600 },
{ nsRect(0, 20, 20, 10), 600 },
// Remove a 10x20 chunk from the square
{ nsRect(0, 0, 10, 20), 600 },
{ nsRect(20, 0, 10, 20), 600 },
{ nsRect(20, 10, 10, 20), 600 },
{ nsRect(0, 10, 10, 20), 600 },
// Remove the center 10x10
{ nsRect(10, 10, 10, 10), 300 },
// Remove the middle column
{ nsRect(10, 0, 10, 30), 300 },
// Remove the middle row
{ nsRect(0, 10, 30, 10), 300 },
// Remove the corners 10x10
{ nsRect(0, 0, 10, 10), 600 },
{ nsRect(20, 20, 10, 10), 600 },
{ nsRect(20, 0, 10, 10), 600 },
{ nsRect(0, 20, 10, 10), 600 },
// Remove the corners 20x20
{ nsRect(0, 0, 20, 20), 300 },
{ nsRect(10, 10, 20, 20), 300 },
{ nsRect(10, 0, 20, 20), 300 },
{ nsRect(0, 10, 20, 20), 300 }
};
for (int32_t i = 0; i < nTests; i++) {
nsRegion r2;
r2.Sub(r, tests[i].rect);
EXPECT_TRUE(r2.IsComplex()) << "nsRegion code got unexpectedly smarter!";
nsRect largest = r2.GetLargestRectangle();
EXPECT_TRUE(largest.width * largest.height == tests[i].expectedArea) <<
"Did not successfully find largest rectangle in non-rectangular region on iteration " << i;
}
}
static void TwoRectTest() {
nsRegion r(nsRect(0, 0, 100, 100));
const int nTests = 4;
struct {
nsRect rect1, rect2;
int64_t expectedArea;
} tests[nTests] = {
{ nsRect(0, 0, 75, 40), nsRect(0, 60, 75, 40), 2500 },
{ nsRect(25, 0, 75, 40), nsRect(25, 60, 75, 40), 2500 },
{ nsRect(25, 0, 75, 40), nsRect(0, 60, 75, 40), 2000 },
{ nsRect(0, 0, 75, 40), nsRect(25, 60, 75, 40), 2000 },
};
for (int32_t i = 0; i < nTests; i++) {
nsRegion r2;
r2.Sub(r, tests[i].rect1);
r2.Sub(r2, tests[i].rect2);
EXPECT_TRUE(r2.IsComplex()) << "nsRegion code got unexpectedly smarter!";
nsRect largest = r2.GetLargestRectangle();
EXPECT_TRUE(largest.width * largest.height == tests[i].expectedArea) <<
"Did not successfully find largest rectangle in two-rect-subtract region on iteration " << i;
}
}
static void TestContainsSpecifiedRect() {
nsRegion r(nsRect(0, 0, 100, 100));
r.Or(r, nsRect(0, 300, 50, 50));
EXPECT_TRUE(r.GetLargestRectangle(nsRect(0, 300, 10, 10)).IsEqualInterior(nsRect(0, 300, 50, 50))) <<
"Chose wrong rectangle";
}
static void TestContainsSpecifiedOverflowingRect() {
nsRegion r(nsRect(0, 0, 100, 100));
r.Or(r, nsRect(0, 300, 50, 50));
EXPECT_TRUE(r.GetLargestRectangle(nsRect(0, 290, 10, 20)).IsEqualInterior(nsRect(0, 300, 50, 50))) <<
"Chose wrong rectangle";
}
};
TEST(Gfx, RegionSingleRect) {
TestLargestRegion::TestSingleRect(nsRect(0, 52, 720, 480));
TestLargestRegion::TestSingleRect(nsRect(-20, 40, 50, 20));
TestLargestRegion::TestSingleRect(nsRect(-20, 40, 10, 8));
TestLargestRegion::TestSingleRect(nsRect(-20, -40, 10, 8));
TestLargestRegion::TestSingleRect(nsRect(-10, -10, 20, 20));
}
TEST(Gfx, RegionNonRectangular) {
TestLargestRegion::TestNonRectangular();
}
TEST(Gfx, RegionTwoRectTest) {
TestLargestRegion::TwoRectTest();
}
TEST(Gfx, RegionContainsSpecifiedRect) {
TestLargestRegion::TestContainsSpecifiedRect();
}
TEST(Gfx, RegionTestContainsSpecifiedOverflowingRect) {
TestLargestRegion::TestContainsSpecifiedOverflowingRect();
}
TEST(Gfx, RegionScaleToInside) {
{ // no rectangles
nsRegion r;
nsIntRegion scaled = r.ScaleToInsidePixels(1, 1, 60);
nsIntRegion result;
EXPECT_TRUE(result.IsEqual(scaled)) <<
"scaled result incorrect";
}
{ // one rectangle
nsRegion r(nsRect(0,44760,19096,264));
nsIntRegion scaled = r.ScaleToInsidePixels(1, 1, 60);
nsIntRegion result(nsIntRect(0,746,318,4));
EXPECT_TRUE(result.IsEqual(scaled)) <<
"scaled result incorrect";
}
{ // the first rectangle gets adjusted
nsRegion r(nsRect(0,44760,19096,264));
r.Or(r, nsRect(0,45024,19360,1056));
nsIntRegion scaled = r.ScaleToInsidePixels(1, 1, 60);
nsIntRegion result(nsIntRect(0,746,318,5));
result.Or(result, nsIntRect(0,751,322,17));
EXPECT_TRUE(result.IsEqual(scaled)) <<
"scaled result incorrect";
}
{ // the second rectangle gets adjusted
nsRegion r(nsRect(0,44760,19360,264));
r.Or(r, nsRect(0,45024,19096,1056));
nsIntRegion scaled = r.ScaleToInsidePixels(1, 1, 60);
nsIntRegion result(nsIntRect(0,746,322,4));
result.Or(result, nsIntRect(0,750,318,18));
EXPECT_TRUE(result.IsEqual(scaled)) <<
"scaled result incorrect";
}
}
TEST(Gfx, RegionSimplify) {
{ // ensure simplify works on a single rect
nsRegion r(nsRect(0,100,200,100));
r.SimplifyOutwardByArea(100*100);
nsRegion result(nsRect(0,100,200,100));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not the same";
}
{ // the rectangles will be merged
nsRegion r(nsRect(0,100,200,100));
r.Or(r, nsRect(0,200,300,200));
r.SimplifyOutwardByArea(100*100);
nsRegion result(nsRect(0,100,300,300));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not merged";
}
{ // two rectangle on the first span
// one on the second
nsRegion r(nsRect(0,100,200,100));
r.Or(r, nsRect(0,200,300,200));
r.Or(r, nsRect(250,100,50,100));
EXPECT_TRUE(r.GetNumRects() == 3) <<
"wrong number of rects";
r.SimplifyOutwardByArea(100*100);
nsRegion result(nsRect(0,100,300,300));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not merged";
}
{ // the rectangles will be merged
nsRegion r(nsRect(0,100,200,100));
r.Or(r, nsRect(0,200,300,200));
r.Or(r, nsRect(250,100,50,100));
r.Sub(r, nsRect(200,200,40,200));
EXPECT_TRUE(r.GetNumRects() == 4) <<
"wrong number of rects";
r.SimplifyOutwardByArea(100*100);
nsRegion result(nsRect(0,100,300,300));
result.Sub(result, nsRect(200,100,40,300));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not merged";
}
{ // three spans of rectangles
nsRegion r(nsRect(0,100,200,100));
r.Or(r, nsRect(0,200,300,200));
r.Or(r, nsRect(250,100,50,50));
r.Sub(r, nsRect(200,200,40,200));
r.SimplifyOutwardByArea(100*100);
nsRegion result(nsRect(0,100,300,300));
result.Sub(result, nsRect(200,100,40,300));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not merged";
}
{ // three spans of rectangles and an unmerged rectangle
nsRegion r(nsRect(0,100,200,100));
r.Or(r, nsRect(0,200,300,200));
r.Or(r, nsRect(250,100,50,50));
r.Sub(r, nsRect(200,200,40,200));
r.Or(r, nsRect(250,900,150,50));
r.SimplifyOutwardByArea(100*100);
nsRegion result(nsRect(0,100,300,300));
result.Sub(result, nsRect(200,100,40,300));
result.Or(result, nsRect(250,900,150,50));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not merged";
}
{ // unmerged regions
nsRegion r(nsRect(0,100,200,100));
r.Or(r, nsRect(0,200,300,200));
r.SimplifyOutwardByArea(100);
nsRegion result(nsRect(0,100,200,100));
result.Or(result, nsRect(0,200,300,200));
EXPECT_TRUE(r.IsEqual(result)) <<
"regions not merged";
}
{ // empty region
// just make sure this doesn't crash.
nsRegion r;
r.SimplifyOutwardByArea(100);
}
}
TEST(Gfx, RegionContains)
{
{ // ensure Contains works on a simple region
nsRegion r(nsRect(0, 0, 100, 100));
EXPECT_TRUE(r.Contains(0, 0));
EXPECT_TRUE(r.Contains(0, 99));
EXPECT_TRUE(r.Contains(99, 0));
EXPECT_TRUE(r.Contains(99, 99));
EXPECT_FALSE(r.Contains(-1, 50));
EXPECT_FALSE(r.Contains(100, 50));
EXPECT_FALSE(r.Contains(50, -1));
EXPECT_FALSE(r.Contains(50, 100));
EXPECT_TRUE(r.Contains(nsRect(0, 0, 100, 100)));
EXPECT_TRUE(r.Contains(nsRect(99, 99, 1, 1)));
EXPECT_FALSE(r.Contains(nsRect(100, 100, 1, 1)));
EXPECT_FALSE(r.Contains(nsRect(100, 100, 0, 0)));
}
{ // empty regions contain nothing
nsRegion r(nsRect(100, 100, 0, 0));
EXPECT_FALSE(r.Contains(0, 0));
EXPECT_FALSE(r.Contains(100, 100));
EXPECT_FALSE(r.Contains(nsRect(100, 100, 0, 0)));
EXPECT_FALSE(r.Contains(nsRect(100, 100, 1, 1)));
}
{ // complex region contain tests
// The region looks like this, with two squares that overlap.
// (hard to do accurately with ASCII art)
// +------+
// | |
// | +--+
// | |
// +--+ |
// | |
// +------+
nsRegion r(nsRect(0, 0, 100, 100));
r.OrWith(nsRect(50, 50, 100, 100));
EXPECT_TRUE(r.Contains(0, 0));
EXPECT_TRUE(r.Contains(99, 99));
EXPECT_TRUE(r.Contains(50, 100));
EXPECT_TRUE(r.Contains(100, 50));
EXPECT_TRUE(r.Contains(149, 149));
EXPECT_FALSE(r.Contains(49, 100));
EXPECT_FALSE(r.Contains(100, 49));
EXPECT_FALSE(r.Contains(150, 150));
EXPECT_TRUE(r.Contains(nsRect(100, 100, 1, 1)));
EXPECT_FALSE(r.Contains(nsRect(49, 99, 2, 2)));
}
{ // region with a hole
nsRegion r(nsRect(0, 0, 100, 100));
r.SubOut(nsRect(40, 40, 10, 10));
EXPECT_TRUE(r.Contains(0, 0));
EXPECT_TRUE(r.Contains(39, 39));
EXPECT_FALSE(r.Contains(40, 40));
EXPECT_FALSE(r.Contains(49, 49));
EXPECT_TRUE(r.Contains(50, 50));
EXPECT_FALSE(r.Contains(nsRect(40, 40, 10, 10)));
EXPECT_FALSE(r.Contains(nsRect(39, 39, 2, 2)));
}
}
#define DILATE_VALUE 0x88
#define REGION_VALUE 0xff
struct RegionBitmap {
RegionBitmap(unsigned char *bitmap, int width, int height) : bitmap(bitmap), width(width), height(height) {}
void clear() {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
bitmap[x + y * width] = 0;
}
}
}
void set(nsRegion &region) {
clear();
nsRegionRectIterator iter(region);
for (const nsRect* r = iter.Next(); r; r = iter.Next()) {
for (int y = r->y; y < r->YMost(); y++) {
for (int x = r->x; x < r->XMost(); x++) {
bitmap[x + y * width] = REGION_VALUE;
}
}
}
}
void dilate() {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (bitmap[x + y * width] == REGION_VALUE) {
for (int yn = max(y - 1, 0); yn <= min(y + 1, height - 1); yn++) {
for (int xn = max(x - 1, 0); xn <= min(x + 1, width - 1); xn++) {
if (bitmap[xn + yn * width] == 0)
bitmap[xn + yn * width] = DILATE_VALUE;
}
}
}
}
}
}
void compare(RegionBitmap &reference) {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
EXPECT_EQ(bitmap[x + y * width], reference.bitmap[x + y * width]);
}
}
}
unsigned char *bitmap;
int width;
int height;
};
void VisitEdge(void *closure, VisitSide side, int x1, int y1, int x2, int y2)
{
RegionBitmap *visitor = static_cast<RegionBitmap*>(closure);
unsigned char *bitmap = visitor->bitmap;
const int width = visitor->width;
if (side == VisitSide::TOP) {
while (x1 != x2) {
bitmap[x1 + (y1 - 1) * width] = DILATE_VALUE;
x1++;
}
} else if (side == VisitSide::BOTTOM) {
while (x1 != x2) {
bitmap[x1 + y1 * width] = DILATE_VALUE;
x1++;
}
} else if (side == VisitSide::LEFT) {
while (y1 != y2) {
bitmap[x1 - 1 + y1 *width] = DILATE_VALUE;
y1++;
}
} else if (side == VisitSide::RIGHT) {
while (y1 != y2) {
bitmap[x1 + y1 * width] = DILATE_VALUE;
y1++;
}
}
}
void TestVisit(nsRegion &r)
{
unsigned char reference[600 * 600];
unsigned char result[600 * 600];
RegionBitmap ref(reference, 600, 600);
RegionBitmap res(result, 600, 600);
ref.set(r);
ref.dilate();
res.set(r);
r.VisitEdges(VisitEdge, &res);
res.compare(ref);
}
TEST(Gfx, RegionVisitEdges) {
{ // visit edges
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(20, 120, 200, 100));
TestVisit(r);
}
{ // two rects side by side - 1 pixel inbetween
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(121, 20, 100, 100));
TestVisit(r);
}
{ // two rects side by side - 2 pixels inbetween
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(122, 20, 100, 100));
TestVisit(r);
}
{
// only corner of the rects are touching
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(120, 120, 100, 100));
TestVisit(r);
}
{
// corners are 1 pixel away
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(121, 120, 100, 100));
TestVisit(r);
}
{
// vertically separated
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(120, 125, 100, 100));
TestVisit(r);
}
{
// not touching
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(130, 120, 100, 100));
r.Or(r, nsRect(240, 20, 100, 100));
TestVisit(r);
}
{ // rect with a hole in it
nsRegion r(nsRect(20, 20, 100, 100));
r.Sub(r, nsRect(40, 40, 10, 10));
TestVisit(r);
}
{
// left overs
nsRegion r(nsRect(20, 20, 10, 10));
r.Or(r, nsRect(50, 20, 10, 10));
r.Or(r, nsRect(90, 20, 10, 10));
r.Or(r, nsRect(24, 30, 10, 10));
r.Or(r, nsRect(20, 40, 15, 10));
r.Or(r, nsRect(50, 40, 15, 10));
r.Or(r, nsRect(90, 40, 15, 10));
TestVisit(r);
}
{
// vertically separated
nsRegion r(nsRect(20, 20, 100, 100));
r.Or(r, nsRect(120, 125, 100, 100));
TestVisit(r);
}
}