gecko/gfx/tests/TestRegion.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Rob Arnold <robarnold@cs.cmu.edu>
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "TestHarness.h"
#include "nsRegion.h"
class TestLargestRegion {
static PRBool TestSingleRect(nsRect r) {
nsRegion region(r);
if (region.GetLargestRectangle() != r) {
fail("largest rect of singleton %d %d %d %d", r.x, r.y, r.width, r.height);
return PR_FALSE;
}
return PR_TRUE;
}
// Construct a rectangle, remove part of it, then check the remainder
static PRBool TestNonRectangular() {
nsRegion r(nsRect(0, 0, 30, 30));
const int nTests = 19;
struct {
nsRect rect;
PRInt64 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 }
};
PRBool success = PR_TRUE;
for (PRInt32 i = 0; i < nTests; i++) {
nsRegion r2;
r2.Sub(r, tests[i].rect);
if (!r2.IsComplex())
fail("nsRegion code got unexpectedly smarter!");
nsRect largest = r2.GetLargestRectangle();
if (largest.width * largest.height != tests[i].expectedArea) {
fail("Did not succesfully find largest rectangle in non-rectangular region on iteration %d", i);
success = PR_FALSE;
}
}
return success;
}
static PRBool TwoRectTest() {
nsRegion r(nsRect(0, 0, 100, 100));
const int nTests = 4;
struct {
nsRect rect1, rect2;
PRInt64 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 },
};
PRBool success = PR_TRUE;
for (PRInt32 i = 0; i < nTests; i++) {
nsRegion r2;
r2.Sub(r, tests[i].rect1);
r2.Sub(r2, tests[i].rect2);
if (!r2.IsComplex())
fail("nsRegion code got unexpectedly smarter!");
nsRect largest = r2.GetLargestRectangle();
if (largest.width * largest.height != tests[i].expectedArea) {
fail("Did not succesfully find largest rectangle in two-rect-subtract region on iteration %d", i);
success = PR_FALSE;
}
}
return success;
}
static PRBool TestContainsSpecifiedRect() {
nsRegion r(nsRect(0, 0, 100, 100));
r.Or(r, nsRect(0, 300, 50, 50));
if (r.GetLargestRectangle(nsRect(0, 300, 10, 10)) != nsRect(0, 300, 50, 50)) {
fail("Chose wrong rectangle");
return PR_FALSE;
}
return PR_TRUE;
}
static PRBool TestContainsSpecifiedOverflowingRect() {
nsRegion r(nsRect(0, 0, 100, 100));
r.Or(r, nsRect(0, 300, 50, 50));
if (r.GetLargestRectangle(nsRect(0, 290, 10, 20)) != nsRect(0, 300, 50, 50)) {
fail("Chose wrong rectangle");
return PR_FALSE;
}
return PR_TRUE;
}
public:
static PRBool Test() {
if (!TestSingleRect(nsRect(0, 52, 720, 480)) ||
!TestSingleRect(nsRect(-20, 40, 50, 20)) ||
!TestSingleRect(nsRect(-20, 40, 10, 8)) ||
!TestSingleRect(nsRect(-20, -40, 10, 8)) ||
!TestSingleRect(nsRect(-10, -10, 20, 20)))
return PR_FALSE;
if (!TestNonRectangular())
return PR_FALSE;
if (!TwoRectTest())
return PR_FALSE;
if (!TestContainsSpecifiedRect())
return PR_FALSE;
if (!TestContainsSpecifiedOverflowingRect())
return PR_FALSE;
passed("TestLargestRegion");
return PR_TRUE;
}
};
int main(int argc, char** argv) {
ScopedXPCOM xpcom("TestRegion");
if (xpcom.failed())
return -1;
if (!TestLargestRegion::Test())
return -1;
return 0;
}