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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 "SkCanvas.h"
#include "SkPaint.h"
#include "SkCubicClipper.h"
#include "SkGeometry.h"
// Currently the supersampler blitter uses int16_t for its index into an array
// the width of the clip. Test that we don't crash/assert if we try to draw
// with a device/clip that is larger.
static void test_giantClip() {
SkBitmap bm;
bm.setConfig(SkBitmap::kARGB_8888_Config, 64919, 1);
bm.allocPixels();
SkCanvas canvas(bm);
canvas.clear(0);
SkPath path;
path.moveTo(0, 0); path.lineTo(1, 0); path.lineTo(33, 1);
SkPaint paint;
paint.setAntiAlias(true);
canvas.drawPath(path, paint);
}
static void PrintCurve(const char *name, const SkPoint crv[4]) {
printf("%s: %.10g, %.10g, %.10g, %.10g, %.10g, %.10g, %.10g, %.10g\n",
name,
(float)crv[0].fX, (float)crv[0].fY,
(float)crv[1].fX, (float)crv[1].fY,
(float)crv[2].fX, (float)crv[2].fY,
(float)crv[3].fX, (float)crv[3].fY);
}
static bool CurvesAreEqual(const SkPoint c0[4],
const SkPoint c1[4],
float tol) {
for (int i = 0; i < 4; i++) {
if (SkScalarAbs(c0[i].fX - c1[i].fX) > SkFloatToScalar(tol) ||
SkScalarAbs(c0[i].fY - c1[i].fY) > SkFloatToScalar(tol)
) {
PrintCurve("c0", c0);
PrintCurve("c1", c1);
return false;
}
}
return true;
}
static SkPoint* SetCurve(float x0, float y0,
float x1, float y1,
float x2, float y2,
float x3, float y3,
SkPoint crv[4]) {
crv[0].fX = SkFloatToScalar(x0); crv[0].fY = SkFloatToScalar(y0);
crv[1].fX = SkFloatToScalar(x1); crv[1].fY = SkFloatToScalar(y1);
crv[2].fX = SkFloatToScalar(x2); crv[2].fY = SkFloatToScalar(y2);
crv[3].fX = SkFloatToScalar(x3); crv[3].fY = SkFloatToScalar(y3);
return crv;
}
static void TestCubicClipping(skiatest::Reporter* reporter) {
static SkPoint crv[4] = {
{ SkIntToScalar(0), SkIntToScalar(0) },
{ SkIntToScalar(2), SkIntToScalar(3) },
{ SkIntToScalar(1), SkIntToScalar(10) },
{ SkIntToScalar(4), SkIntToScalar(12) }
};
SkCubicClipper clipper;
SkPoint clipped[4], shouldbe[4];
SkIRect clipRect;
bool success;
const float tol = SkFloatToScalar(1e-4);
// Test no clip, with plenty of room.
clipRect.set(-2, -2, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol));
// Test no clip, touching first point.
clipRect.set(-2, 0, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol));
// Test no clip, touching last point.
clipRect.set(-2, -2, 6, 12);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol));
// Test all clip.
clipRect.set(-2, 14, 6, 20);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == false);
// Test clip at 1.
clipRect.set(-2, 1, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0.5126125216, 1,
1.841195941, 4.337081432,
1.297019958, 10.19801331,
4, 12,
shouldbe), tol));
// Test clip at 2.
clipRect.set(-2, 2, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
00.8412352204, 2,
1.767683744, 5.400758266,
1.55052948, 10.36701965,
4, 12,
shouldbe), tol));
// Test clip at 11.
clipRect.set(-2, -2, 6, 11);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0,
1.742904663, 2.614356995,
1.207521796, 8.266430855,
3.026495695, 11,
shouldbe), tol));
// Test clip at 10.
clipRect.set(-2, -2, 6, 10);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0,
1.551193237, 2.326789856,
1.297736168, 7.059780121,
2.505550385, 10,
shouldbe), tol));
test_giantClip();
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("CubicClipper", CubicClippingTestClass, TestCubicClipping)
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