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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 "SkEdgeClipper.h"
#include "SkLineClipper.h"
#include "SkPath.h"
#include "Test.h"
static void test_hairclipping(skiatest::Reporter* reporter) {
SkBitmap bm;
bm.allocN32Pixels(4, 4);
bm.eraseColor(SK_ColorWHITE);
SkPaint paint;
paint.setAntiAlias(true);
SkCanvas canvas(bm);
canvas.clipRect(SkRect::MakeWH(SkIntToScalar(4), SkIntToScalar(2)));
canvas.drawLine(1.5f, 1.5f,
3.5f, 3.5f, paint);
/**
* We had a bug where we misinterpreted the bottom of the clip, and
* would draw another pixel (to the right in this case) on the same
* last scanline. i.e. we would draw to [2,1], even though this hairline
* should just draw to [1,1], [2,2], [3,3] modulo the clip.
*
* The result of this entire draw should be that we only draw to [1,1]
*
* Fixed in rev. 3366
*/
for (int y = 0; y < 4; ++y) {
for (int x = 0; x < 4; ++x) {
bool nonWhite = (1 == y) && (1 == x);
SkPMColor c = *bm.getAddr32(x, y);
if (nonWhite) {
REPORTER_ASSERT(reporter, 0xFFFFFFFF != c);
} else {
REPORTER_ASSERT(reporter, 0xFFFFFFFF == c);
}
}
}
}
static void test_edgeclipper() {
SkEdgeClipper clipper(false);
const SkPoint pts[] = {
{ 3.0995476e+010f, 42.929779f },
{ -3.0995163e+010f, 51.050385f },
{ -3.0995157e+010f, 51.050392f },
{ -3.0995134e+010f, 51.050400f },
};
const SkRect clip = { 0, 0, SkIntToScalar(300), SkIntToScalar(200) };
// this should not assert, even though our choppers do a poor numerical
// job when computing their t values.
// http://code.google.com/p/skia/issues/detail?id=444
clipper.clipCubic(pts, clip);
}
static void test_intersectline(skiatest::Reporter* reporter) {
static const SkScalar L = 0;
static const SkScalar T = 0;
static const SkScalar R = SkIntToScalar(100);
static const SkScalar B = SkIntToScalar(100);
static const SkScalar CX = SkScalarHalf(L + R);
static const SkScalar CY = SkScalarHalf(T + B);
static const SkRect gR = { L, T, R, B };
size_t i;
SkPoint dst[2];
static const SkPoint gEmpty[] = {
// sides
{ L, CY }, { L - 10, CY },
{ R, CY }, { R + 10, CY },
{ CX, T }, { CX, T - 10 },
{ CX, B }, { CX, B + 10 },
// corners
{ L, T }, { L - 10, T - 10 },
{ L, B }, { L - 10, B + 10 },
{ R, T }, { R + 10, T - 10 },
{ R, B }, { R + 10, B + 10 },
};
for (i = 0; i < SK_ARRAY_COUNT(gEmpty); i += 2) {
bool valid = SkLineClipper::IntersectLine(&gEmpty[i], gR, dst);
if (valid) {
SkDebugf("----- [%d] %g %g -> %g %g\n", i/2, dst[0].fX, dst[0].fY, dst[1].fX, dst[1].fY);
}
REPORTER_ASSERT(reporter, !valid);
}
static const SkPoint gFull[] = {
// diagonals, chords
{ L, T }, { R, B },
{ L, B }, { R, T },
{ CX, T }, { CX, B },
{ L, CY }, { R, CY },
{ CX, T }, { R, CY },
{ CX, T }, { L, CY },
{ L, CY }, { CX, B },
{ R, CY }, { CX, B },
// edges
{ L, T }, { L, B },
{ R, T }, { R, B },
{ L, T }, { R, T },
{ L, B }, { R, B },
};
for (i = 0; i < SK_ARRAY_COUNT(gFull); i += 2) {
bool valid = SkLineClipper::IntersectLine(&gFull[i], gR, dst);
if (!valid || memcmp(&gFull[i], dst, sizeof(dst))) {
SkDebugf("++++ [%d] %g %g -> %g %g\n", i/2, dst[0].fX, dst[0].fY, dst[1].fX, dst[1].fY);
}
REPORTER_ASSERT(reporter, valid && !memcmp(&gFull[i], dst, sizeof(dst)));
}
static const SkPoint gPartial[] = {
{ L - 10, CY }, { CX, CY }, { L, CY }, { CX, CY },
{ CX, T - 10 }, { CX, CY }, { CX, T }, { CX, CY },
{ R + 10, CY }, { CX, CY }, { R, CY }, { CX, CY },
{ CX, B + 10 }, { CX, CY }, { CX, B }, { CX, CY },
// extended edges
{ L, T - 10 }, { L, B + 10 }, { L, T }, { L, B },
{ R, T - 10 }, { R, B + 10 }, { R, T }, { R, B },
{ L - 10, T }, { R + 10, T }, { L, T }, { R, T },
{ L - 10, B }, { R + 10, B }, { L, B }, { R, B },
};
for (i = 0; i < SK_ARRAY_COUNT(gPartial); i += 4) {
bool valid = SkLineClipper::IntersectLine(&gPartial[i], gR, dst);
if (!valid || memcmp(&gPartial[i+2], dst, sizeof(dst))) {
SkDebugf("++++ [%d] %g %g -> %g %g\n", i/2, dst[0].fX, dst[0].fY, dst[1].fX, dst[1].fY);
}
REPORTER_ASSERT(reporter, valid &&
!memcmp(&gPartial[i+2], dst, sizeof(dst)));
}
}
DEF_TEST(Clipper, reporter) {
test_intersectline(reporter);
test_edgeclipper();
test_hairclipping(reporter);
}
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