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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 "SkCanvas.h"
#include "SkCubicClipper.h"
#include "SkGeometry.h"
#include "SkPaint.h"
#include "Test.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.allocN32Pixels(64919, 1);
SkCanvas canvas(bm);
canvas.clear(SK_ColorTRANSPARENT);
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]) {
SkDebugf("%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) > tol ||
SkScalarAbs(c0[i].fY - c1[i].fY) > 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 = x0; crv[0].fY = y0;
crv[1].fX = x1; crv[1].fY = y1;
crv[2].fX = x2; crv[2].fY = y2;
crv[3].fX = x3; crv[3].fY = y3;
return crv;
}
DEF_TEST(ClipCubic, 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 = 1e-4f;
// 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(
0.5126125216f, 1,
1.841195941f, 4.337081432f,
1.297019958f, 10.19801331f,
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(
00.8412352204f, 2,
1.767683744f, 5.400758266f,
1.55052948f, 10.36701965f,
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,
1.742904663f, 2.614356995f,
1.207521796f, 8.266430855f,
3.026495695f, 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,
1.551193237f, 2.326789856f,
1.297736168f, 7.059780121f,
2.505550385f, 10,
shouldbe), tol));
test_giantClip();
}
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