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skia2/tests/AAClipTest.cpp
commit-bot@chromium.org e0e7cfe44b Change old PRG to be SkLCGRandom; change new one to SkRandom 
The goal here is to get people to start using the new random number
generator, while leaving the old one in place so we don't have to 
rebaseline GMs.

R=reed@google.com, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23576015

git-svn-id: http://skia.googlecode.com/svn/trunk@11169 2bbb7eff-a529-9590-31e7-b0007b416f81
2013-09-09 20:09:12 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Test.h"
#include "SkAAClip.h"
#include "SkCanvas.h"
#include "SkMask.h"
#include "SkPath.h"
#include "SkRandom.h"
static bool operator==(const SkMask& a, const SkMask& b) {
if (a.fFormat != b.fFormat || a.fBounds != b.fBounds) {
return false;
}
if (!a.fImage && !b.fImage) {
return true;
}
if (!a.fImage || !b.fImage) {
return false;
}
size_t wbytes = a.fBounds.width();
switch (a.fFormat) {
case SkMask::kBW_Format:
wbytes = (wbytes + 7) >> 3;
break;
case SkMask::kA8_Format:
case SkMask::k3D_Format:
break;
case SkMask::kLCD16_Format:
wbytes <<= 1;
break;
case SkMask::kLCD32_Format:
case SkMask::kARGB32_Format:
wbytes <<= 2;
break;
default:
SkDEBUGFAIL("unknown mask format");
return false;
}
const int h = a.fBounds.height();
const char* aptr = (const char*)a.fImage;
const char* bptr = (const char*)b.fImage;
for (int y = 0; y < h; ++y) {
if (memcmp(aptr, bptr, wbytes)) {
return false;
}
aptr += wbytes;
bptr += wbytes;
}
return true;
}
static void copyToMask(const SkRegion& rgn, SkMask* mask) {
mask->fFormat = SkMask::kA8_Format;
if (rgn.isEmpty()) {
mask->fBounds.setEmpty();
mask->fRowBytes = 0;
mask->fImage = NULL;
return;
}
mask->fBounds = rgn.getBounds();
mask->fRowBytes = mask->fBounds.width();
mask->fImage = SkMask::AllocImage(mask->computeImageSize());
sk_bzero(mask->fImage, mask->computeImageSize());
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kA8_Config, mask->fBounds.width(),
mask->fBounds.height(), mask->fRowBytes);
bitmap.setPixels(mask->fImage);
// canvas expects its coordinate system to always be 0,0 in the top/left
// so we translate the rgn to match that before drawing into the mask.
//
SkRegion tmpRgn(rgn);
tmpRgn.translate(-rgn.getBounds().fLeft, -rgn.getBounds().fTop);
SkCanvas canvas(bitmap);
canvas.clipRegion(tmpRgn);
canvas.drawColor(SK_ColorBLACK);
}
static SkIRect rand_rect(SkRandom& rand, int n) {
int x = rand.nextS() % n;
int y = rand.nextS() % n;
int w = rand.nextU() % n;
int h = rand.nextU() % n;
return SkIRect::MakeXYWH(x, y, w, h);
}
static void make_rand_rgn(SkRegion* rgn, SkRandom& rand) {
int count = rand.nextU() % 20;
for (int i = 0; i < count; ++i) {
rgn->op(rand_rect(rand, 100), SkRegion::kXOR_Op);
}
}
static bool operator==(const SkRegion& rgn, const SkAAClip& aaclip) {
SkMask mask0, mask1;
copyToMask(rgn, &mask0);
aaclip.copyToMask(&mask1);
bool eq = (mask0 == mask1);
SkMask::FreeImage(mask0.fImage);
SkMask::FreeImage(mask1.fImage);
return eq;
}
static bool equalsAAClip(const SkRegion& rgn) {
SkAAClip aaclip;
aaclip.setRegion(rgn);
return rgn == aaclip;
}
static void setRgnToPath(SkRegion* rgn, const SkPath& path) {
SkIRect ir;
path.getBounds().round(&ir);
rgn->setPath(path, SkRegion(ir));
}
// aaclip.setRegion should create idential masks to the region
static void test_rgn(skiatest::Reporter* reporter) {
SkRandom rand;
for (int i = 0; i < 1000; i++) {
SkRegion rgn;
make_rand_rgn(&rgn, rand);
REPORTER_ASSERT(reporter, equalsAAClip(rgn));
}
{
SkRegion rgn;
SkPath path;
path.addCircle(0, 0, SkIntToScalar(30));
setRgnToPath(&rgn, path);
REPORTER_ASSERT(reporter, equalsAAClip(rgn));
path.reset();
path.moveTo(0, 0);
path.lineTo(SkIntToScalar(100), 0);
path.lineTo(SkIntToScalar(100 - 20), SkIntToScalar(20));
path.lineTo(SkIntToScalar(20), SkIntToScalar(20));
setRgnToPath(&rgn, path);
REPORTER_ASSERT(reporter, equalsAAClip(rgn));
}
}
static const SkRegion::Op gRgnOps[] = {
SkRegion::kDifference_Op,
SkRegion::kIntersect_Op,
SkRegion::kUnion_Op,
SkRegion::kXOR_Op,
SkRegion::kReverseDifference_Op,
SkRegion::kReplace_Op
};
static const char* gRgnOpNames[] = {
"DIFF", "INTERSECT", "UNION", "XOR", "REVERSE_DIFF", "REPLACE"
};
static void imoveTo(SkPath& path, int x, int y) {
path.moveTo(SkIntToScalar(x), SkIntToScalar(y));
}
static void icubicTo(SkPath& path, int x0, int y0, int x1, int y1, int x2, int y2) {
path.cubicTo(SkIntToScalar(x0), SkIntToScalar(y0),
SkIntToScalar(x1), SkIntToScalar(y1),
SkIntToScalar(x2), SkIntToScalar(y2));
}
static void test_path_bounds(skiatest::Reporter* reporter) {
SkPath path;
SkAAClip clip;
const int height = 40;
const SkScalar sheight = SkIntToScalar(height);
path.addOval(SkRect::MakeWH(sheight, sheight));
REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
clip.setPath(path, NULL, true);
REPORTER_ASSERT(reporter, height == clip.getBounds().height());
// this is the trimmed height of this cubic (with aa). The critical thing
// for this test is that it is less than height, which represents just
// the bounds of the path's control-points.
//
// This used to fail until we tracked the MinY in the BuilderBlitter.
//
const int teardrop_height = 12;
path.reset();
imoveTo(path, 0, 20);
icubicTo(path, 40, 40, 40, 0, 0, 20);
REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
clip.setPath(path, NULL, true);
REPORTER_ASSERT(reporter, teardrop_height == clip.getBounds().height());
}
static void test_empty(skiatest::Reporter* reporter) {
SkAAClip clip0, clip1;
REPORTER_ASSERT(reporter, clip0.isEmpty());
REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
REPORTER_ASSERT(reporter, clip1 == clip0);
clip0.translate(10, 10); // should have no effect on empty
REPORTER_ASSERT(reporter, clip0.isEmpty());
REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
REPORTER_ASSERT(reporter, clip1 == clip0);
SkIRect r = { 10, 10, 40, 50 };
clip0.setRect(r);
REPORTER_ASSERT(reporter, !clip0.isEmpty());
REPORTER_ASSERT(reporter, !clip0.getBounds().isEmpty());
REPORTER_ASSERT(reporter, clip0 != clip1);
REPORTER_ASSERT(reporter, clip0.getBounds() == r);
clip0.setEmpty();
REPORTER_ASSERT(reporter, clip0.isEmpty());
REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
REPORTER_ASSERT(reporter, clip1 == clip0);
SkMask mask;
mask.fImage = NULL;
clip0.copyToMask(&mask);
REPORTER_ASSERT(reporter, NULL == mask.fImage);
REPORTER_ASSERT(reporter, mask.fBounds.isEmpty());
}
static void rand_irect(SkIRect* r, int N, SkRandom& rand) {
r->setXYWH(0, 0, rand.nextU() % N, rand.nextU() % N);
int dx = rand.nextU() % (2*N);
int dy = rand.nextU() % (2*N);
// use int dx,dy to make the subtract be signed
r->offset(N - dx, N - dy);
}
static void test_irect(skiatest::Reporter* reporter) {
SkRandom rand;
for (int i = 0; i < 10000; i++) {
SkAAClip clip0, clip1;
SkRegion rgn0, rgn1;
SkIRect r0, r1;
rand_irect(&r0, 10, rand);
rand_irect(&r1, 10, rand);
clip0.setRect(r0);
clip1.setRect(r1);
rgn0.setRect(r0);
rgn1.setRect(r1);
for (size_t j = 0; j < SK_ARRAY_COUNT(gRgnOps); ++j) {
SkRegion::Op op = gRgnOps[j];
SkAAClip clip2;
SkRegion rgn2;
bool nonEmptyAA = clip2.op(clip0, clip1, op);
bool nonEmptyBW = rgn2.op(rgn0, rgn1, op);
if (nonEmptyAA != nonEmptyBW || clip2.getBounds() != rgn2.getBounds()) {
SkDebugf("[%d %d %d %d] %s [%d %d %d %d] = BW:[%d %d %d %d] AA:[%d %d %d %d]\n",
r0.fLeft, r0.fTop, r0.right(), r0.bottom(),
gRgnOpNames[j],
r1.fLeft, r1.fTop, r1.right(), r1.bottom(),
rgn2.getBounds().fLeft, rgn2.getBounds().fTop,
rgn2.getBounds().right(), rgn2.getBounds().bottom(),
clip2.getBounds().fLeft, clip2.getBounds().fTop,
clip2.getBounds().right(), clip2.getBounds().bottom());
}
REPORTER_ASSERT(reporter, nonEmptyAA == nonEmptyBW);
REPORTER_ASSERT(reporter, clip2.getBounds() == rgn2.getBounds());
SkMask maskBW, maskAA;
copyToMask(rgn2, &maskBW);
clip2.copyToMask(&maskAA);
SkAutoMaskFreeImage freeBW(maskBW.fImage);
SkAutoMaskFreeImage freeAA(maskAA.fImage);
REPORTER_ASSERT(reporter, maskBW == maskAA);
}
}
}
static void test_path_with_hole(skiatest::Reporter* reporter) {
static const uint8_t gExpectedImage[] = {
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF,
};
SkMask expected;
expected.fBounds.set(0, 0, 4, 6);
expected.fRowBytes = 4;
expected.fFormat = SkMask::kA8_Format;
expected.fImage = (uint8_t*)gExpectedImage;
SkPath path;
path.addRect(SkRect::MakeXYWH(0, 0,
SkIntToScalar(4), SkIntToScalar(2)));
path.addRect(SkRect::MakeXYWH(0, SkIntToScalar(4),
SkIntToScalar(4), SkIntToScalar(2)));
for (int i = 0; i < 2; ++i) {
SkAAClip clip;
clip.setPath(path, NULL, 1 == i);
SkMask mask;
clip.copyToMask(&mask);
SkAutoMaskFreeImage freeM(mask.fImage);
REPORTER_ASSERT(reporter, expected == mask);
}
}
#include "SkRasterClip.h"
static void copyToMask(const SkRasterClip& rc, SkMask* mask) {
if (rc.isAA()) {
rc.aaRgn().copyToMask(mask);
} else {
copyToMask(rc.bwRgn(), mask);
}
}
static bool operator==(const SkRasterClip& a, const SkRasterClip& b) {
if (a.isEmpty()) {
return b.isEmpty();
}
if (b.isEmpty()) {
return false;
}
SkMask ma, mb;
copyToMask(a, &ma);
copyToMask(b, &mb);
SkAutoMaskFreeImage aCleanUp(ma.fImage);
SkAutoMaskFreeImage bCleanUp(mb.fImage);
return ma == mb;
}
static void did_dx_affect(skiatest::Reporter* reporter, const SkScalar dx[],
size_t count, bool changed) {
SkIRect ir = { 0, 0, 10, 10 };
for (size_t i = 0; i < count; ++i) {
SkRect r;
r.set(ir);
SkRasterClip rc0(ir);
SkRasterClip rc1(ir);
SkRasterClip rc2(ir);
rc0.op(r, SkRegion::kIntersect_Op, false);
r.offset(dx[i], 0);
rc1.op(r, SkRegion::kIntersect_Op, true);
r.offset(-2*dx[i], 0);
rc2.op(r, SkRegion::kIntersect_Op, true);
REPORTER_ASSERT(reporter, changed != (rc0 == rc1));
REPORTER_ASSERT(reporter, changed != (rc0 == rc2));
}
}
static void test_nearly_integral(skiatest::Reporter* reporter) {
// All of these should generate equivalent rasterclips
static const SkScalar gSafeX[] = {
0, SK_Scalar1/1000, SK_Scalar1/100, SK_Scalar1/10,
};
did_dx_affect(reporter, gSafeX, SK_ARRAY_COUNT(gSafeX), false);
static const SkScalar gUnsafeX[] = {
SK_Scalar1/4, SK_Scalar1/3,
};
did_dx_affect(reporter, gUnsafeX, SK_ARRAY_COUNT(gUnsafeX), true);
}
static void test_regressions() {
// these should not assert in the debug build
// bug was introduced in rev. 3209
{
SkAAClip clip;
SkRect r;
r.fLeft = SkFloatToScalar(129.892181f);
r.fTop = SkFloatToScalar(10.3999996f);
r.fRight = SkFloatToScalar(130.892181f);
r.fBottom = SkFloatToScalar(20.3999996f);
clip.setRect(r, true);
}
}
static void TestAAClip(skiatest::Reporter* reporter) {
test_empty(reporter);
test_path_bounds(reporter);
test_irect(reporter);
test_rgn(reporter);
test_path_with_hole(reporter);
test_regressions();
test_nearly_integral(reporter);
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("AAClip", AAClipTestClass, TestAAClip)
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