tests/TessellatingPathRendererTests.cpp

/*
 * Copyright 2015 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 "SkPath.h"

#if SK_SUPPORT_GPU
#include "GrClip.h"
#include "GrContext.h"
#include "SkGradientShader.h"
#include "SkShaderBase.h"
#include "ops/GrTessellatingPathRenderer.h"

/*
 * These tests pass by not crashing, hanging or asserting in Debug.
 */

// Tests active edges made inactive by splitting.
// Also tests active edge list forced into an invalid ordering by
// splitting (mopped up in cleanup_active_edges()).
static SkPath create_path_0() {
    SkPath path;
    path.moveTo(229.127044677734375f,  67.34100341796875f);
    path.lineTo(187.8097381591796875f, -6.7729740142822265625f);
    path.lineTo(171.411407470703125f,  50.94266510009765625f);
    path.lineTo(245.5253753662109375f,  9.6253643035888671875f);
    path.moveTo(208.4683990478515625f, 30.284009933471679688f);
    path.lineTo(171.411407470703125f,  50.94266510009765625f);
    path.lineTo(187.8097381591796875f, -6.7729740142822265625f);
    return path;
}

// Intersections which fall exactly on the current vertex, and require
// a restart of the intersection checking.
static SkPath create_path_1() {
    SkPath path;
    path.moveTo(314.483551025390625f, 486.246002197265625f);
    path.lineTo(385.41949462890625f,  532.8087158203125f);
    path.lineTo(373.232879638671875f, 474.05938720703125f);
    path.lineTo(326.670166015625f,    544.995361328125f);
    path.moveTo(349.951507568359375f, 509.52734375f);
    path.lineTo(373.232879638671875f, 474.05938720703125f);
    path.lineTo(385.41949462890625f,  532.8087158203125f);
    return path;
}

// Tests active edges which are removed by splitting.
static SkPath create_path_2() {
    SkPath path;
    path.moveTo(343.107391357421875f, 613.62176513671875f);
    path.lineTo(426.632415771484375f, 628.5740966796875f);
    path.lineTo(392.3460693359375f,   579.33544921875f);
    path.lineTo(377.39373779296875f,  662.86041259765625f);
    path.moveTo(384.869873046875f,    621.097900390625f);
    path.lineTo(392.3460693359375f,   579.33544921875f);
    path.lineTo(426.632415771484375f, 628.5740966796875f);
    return path;
}

// Collinear edges merged in set_top().
// Also, an intersection between left and right enclosing edges which
// falls above the current vertex.
static SkPath create_path_3() {
    SkPath path;
    path.moveTo(545.95751953125f,    791.69854736328125f);
    path.lineTo(612.05816650390625f, 738.494140625f);
    path.lineTo(552.4056396484375f,  732.0460205078125f);
    path.lineTo(605.61004638671875f, 798.14666748046875f);
    path.moveTo(579.00787353515625f, 765.0963134765625f);
    path.lineTo(552.4056396484375f,  732.0460205078125f);
    path.lineTo(612.05816650390625f, 738.494140625f);
    return path;
}

// Tests active edges which are made inactive by set_top().
static SkPath create_path_4() {
    SkPath path;
    path.moveTo(819.2725830078125f,  751.77447509765625f);
    path.lineTo(820.70904541015625f, 666.933837890625f);
    path.lineTo(777.57049560546875f, 708.63592529296875f);
    path.lineTo(862.4111328125f,     710.0723876953125f);
    path.moveTo(819.99078369140625f, 709.3541259765625f);
    path.lineTo(777.57049560546875f, 708.63592529296875f);
    path.lineTo(820.70904541015625f, 666.933837890625f);
    return path;
}

static SkPath create_path_5() {
    SkPath path;
    path.moveTo(823.33209228515625f, 749.052734375f);
    path.lineTo(823.494873046875f,   664.20013427734375f);
    path.lineTo(780.9871826171875f,  706.5450439453125f);
    path.lineTo(865.8397216796875f,  706.70782470703125f);
    path.moveTo(823.4134521484375f,  706.6263427734375f);
    path.lineTo(780.9871826171875f,  706.5450439453125f);
    path.lineTo(823.494873046875f,   664.20013427734375f);
    return path;
}

static SkPath create_path_6() {
    SkPath path;
    path.moveTo(954.862548828125f,   562.8349609375f);
    path.lineTo(899.32818603515625f, 498.679443359375f);
    path.lineTo(895.017578125f,      558.52435302734375f);
    path.lineTo(959.17315673828125f, 502.990081787109375f);
    path.moveTo(927.0953369140625f,  530.7572021484375f);
    path.lineTo(895.017578125f,      558.52435302734375f);
    path.lineTo(899.32818603515625f, 498.679443359375f);
    return path;
}

static SkPath create_path_7() {
    SkPath path;
    path.moveTo(958.5330810546875f,  547.35516357421875f);
    path.lineTo(899.93109130859375f, 485.989013671875f);
    path.lineTo(898.54901123046875f, 545.97308349609375f);
    path.lineTo(959.9151611328125f,  487.37109375f);
    path.moveTo(929.2320556640625f,  516.67205810546875f);
    path.lineTo(898.54901123046875f, 545.97308349609375f);
    path.lineTo(899.93109130859375f, 485.989013671875f);
    return path;
}

static SkPath create_path_8() {
    SkPath path;
    path.moveTo(389.8609619140625f,   369.326873779296875f);
    path.lineTo(470.6290283203125f,   395.33697509765625f);
    path.lineTo(443.250030517578125f, 341.9478759765625f);
    path.lineTo(417.239959716796875f, 422.7159423828125f);
    path.moveTo(430.244964599609375f, 382.3319091796875f);
    path.lineTo(443.250030517578125f, 341.9478759765625f);
    path.lineTo(470.6290283203125f,   395.33697509765625f);
    return path;
}

static SkPath create_path_9() {
    SkPath path;
    path.moveTo(20, 20);
    path.lineTo(50, 80);
    path.lineTo(20, 80);
    path.moveTo(80, 50);
    path.lineTo(50, 50);
    path.lineTo(20, 50);
    return path;
}

static SkPath create_path_10() {
    SkPath path;
    path.moveTo(257.19439697265625f, 320.876617431640625f);
    path.lineTo(190.113037109375f,   320.58978271484375f);
    path.lineTo(203.64404296875f,    293.8145751953125f);
    path.moveTo(203.357177734375f,   360.896026611328125f);
    path.lineTo(216.88824462890625f, 334.120819091796875f);
    path.lineTo(230.41925048828125f, 307.345611572265625f);
    return path;
}

// A degenerate segments case, where both upper and lower segments of
// a split edge must remain active.
static SkPath create_path_11() {
    SkPath path;
    path.moveTo(231.9331207275390625f, 306.2012939453125f);
    path.lineTo(191.4859161376953125f, 306.04547119140625f);
    path.lineTo(231.0659332275390625f, 300.2642822265625f);
    path.moveTo(189.946807861328125f,  302.072265625f);
    path.lineTo(179.79705810546875f,   294.859771728515625f);
    path.lineTo(191.0016021728515625f, 296.165679931640625f);
    path.moveTo(150.8942108154296875f, 304.900146484375f);
    path.lineTo(179.708892822265625f,  297.849029541015625f);
    path.lineTo(190.4742279052734375f, 299.11895751953125f);
    return path;
}

// Handle the case where edge.dist(edge.fTop) != 0.0.
static SkPath create_path_12() {
    SkPath path;
    path.moveTo(                  0.0f,  400.0f);
    path.lineTo(                138.0f,  202.0f);
    path.lineTo(                  0.0f,  202.0f);
    path.moveTo( 12.62693023681640625f,  250.57464599609375f);
    path.lineTo(  8.13896942138671875f,  254.556884765625f);
    path.lineTo(-18.15641021728515625f,  220.40203857421875f);
    path.lineTo(-15.986493110656738281f, 219.6513519287109375f);
    path.moveTo( 36.931194305419921875f, 282.485504150390625f);
    path.lineTo( 15.617521286010742188f, 261.2901611328125f);
    path.lineTo( 10.3829498291015625f,   252.565765380859375f);
    path.lineTo(-16.165292739868164062f, 222.646026611328125f);
    return path;
}

// A degenerate segments case which exercises inactive edges being
// made active by splitting.
static SkPath create_path_13() {
    SkPath path;
    path.moveTo(690.62127685546875f, 509.25555419921875f);
    path.lineTo(99.336181640625f,    511.71405029296875f);
    path.lineTo(708.362548828125f,   512.4349365234375f);
    path.lineTo(729.9940185546875f,  516.3114013671875f);
    path.lineTo(738.708984375f,      518.76995849609375f);
    path.lineTo(678.3463134765625f,  510.0819091796875f);
    path.lineTo(681.21795654296875f, 504.81378173828125f);
    path.moveTo(758.52764892578125f, 521.55963134765625f);
    path.lineTo(719.1549072265625f,  514.50372314453125f);
    path.lineTo(689.59063720703125f, 512.0628662109375f);
    path.lineTo(679.78216552734375f, 507.447845458984375f);
    return path;
}

// Tests vertices which become "orphaned" (ie., no connected edges)
// after simplification.
static SkPath create_path_14() {
    SkPath path;
    path.moveTo(217.326019287109375f, 166.4752960205078125f);
    path.lineTo(226.279266357421875f, 170.929473876953125f);
    path.lineTo(234.3973388671875f,   177.0623626708984375f);
    path.lineTo(262.0921630859375f,   188.746124267578125f);
    path.moveTo(196.23638916015625f,  174.0722198486328125f);
    path.lineTo(416.15277099609375f,  180.138214111328125f);
    path.lineTo(192.651947021484375f, 304.0228271484375f);
    return path;
}

static SkPath create_path_15() {
    SkPath path;
    path.moveTo(    0.0f,   0.0f);
    path.lineTo(10000.0f,   0.0f);
    path.lineTo(    0.0f,  -1.0f);
    path.lineTo(10000.0f,   0.000001f);
    path.lineTo(    0.0f, -30.0f);
    return path;
}

// Reduction of Nebraska-StateSeal.svg. Floating point error causes the
// same edge to be added to more than one poly on the same side.
static SkPath create_path_16() {
    SkPath path;
    path.moveTo(170.8199920654296875,   491.86700439453125);
    path.lineTo(173.7649993896484375,    489.7340087890625);
    path.lineTo(174.1450958251953125,  498.545989990234375);
    path.lineTo( 171.998992919921875,   500.88201904296875);
    path.moveTo(168.2922515869140625,   498.66265869140625);
    path.lineTo(169.8589935302734375,   497.94500732421875);
    path.lineTo(                 172,   500.88299560546875);
    path.moveTo( 169.555267333984375,   490.70111083984375);
    path.lineTo(173.7649993896484375,    489.7340087890625);
    path.lineTo(  170.82000732421875,   491.86700439453125);
    return path;
}

// A simple concave path. Test this with a non-invertible matrix.
static SkPath create_path_17() {
    SkPath path;
    path.moveTo(20, 20);
    path.lineTo(80, 20);
    path.lineTo(30, 30);
    path.lineTo(20, 80);
    return path;
}

// A shape with a vertex collinear to the right hand edge.
// This messes up find_enclosing_edges.
static SkPath create_path_18() {
    SkPath path;
    path.moveTo(80, 20);
    path.lineTo(80, 60);
    path.lineTo(20, 60);
    path.moveTo(80, 50);
    path.lineTo(80, 80);
    path.lineTo(20, 80);
    return path;
}

static sk_sp<GrFragmentProcessor> create_linear_gradient_processor(GrContext* ctx) {
    SkPoint pts[2] = { {0, 0}, {1, 1} };
    SkColor colors[2] = { SK_ColorGREEN, SK_ColorBLUE };
    sk_sp<SkShader> shader = SkGradientShader::MakeLinear(
        pts, colors, nullptr, SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode);
    SkShaderBase::AsFPArgs args(
        ctx, &SkMatrix::I(), &SkMatrix::I(), SkFilterQuality::kLow_SkFilterQuality, nullptr);
    return as_SB(shader)->asFragmentProcessor(args);
}

static void test_path(GrContext* ctx,
                      GrRenderTargetContext* renderTargetContext,
                      const SkPath& path,
                      const SkMatrix& matrix = SkMatrix::I(),
                      GrAAType aaType = GrAAType::kNone,
                      sk_sp<GrFragmentProcessor> fp = nullptr) {
    GrTessellatingPathRenderer tess;

    GrPaint paint;
    paint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
    if (fp) {
        paint.addColorFragmentProcessor(fp);
    }

    GrNoClip noClip;
    GrStyle style(SkStrokeRec::kFill_InitStyle);
    GrShape shape(path, style);
    GrPathRenderer::DrawPathArgs args{ctx,
                                      std::move(paint),
                                      &GrUserStencilSettings::kUnused,
                                      renderTargetContext,
                                      &noClip,
                                      &matrix,
                                      &shape,
                                      aaType,
                                      false};
    tess.drawPath(args);
}

DEF_GPUTEST_FOR_ALL_CONTEXTS(TessellatingPathRendererTests, reporter, ctxInfo) {
    GrContext* ctx = ctxInfo.grContext();

    sk_sp<GrRenderTargetContext> rtc(ctx->makeDeferredRenderTargetContext(
                                                                  SkBackingFit::kApprox,
                                                                  800, 800,
                                                                  kRGBA_8888_GrPixelConfig,
                                                                  nullptr,
                                                                  0,
                                                                  kTopLeft_GrSurfaceOrigin));
    if (!rtc) {
        return;
    }

    ctx->flush();
    test_path(ctx, rtc.get(), create_path_0());
    test_path(ctx, rtc.get(), create_path_1());
    test_path(ctx, rtc.get(), create_path_2());
    test_path(ctx, rtc.get(), create_path_3());
    test_path(ctx, rtc.get(), create_path_4());
    test_path(ctx, rtc.get(), create_path_5());
    test_path(ctx, rtc.get(), create_path_6());
    test_path(ctx, rtc.get(), create_path_7());
    test_path(ctx, rtc.get(), create_path_8());
    test_path(ctx, rtc.get(), create_path_9());
    test_path(ctx, rtc.get(), create_path_10());
    test_path(ctx, rtc.get(), create_path_11());
    test_path(ctx, rtc.get(), create_path_12());
    test_path(ctx, rtc.get(), create_path_13());
    test_path(ctx, rtc.get(), create_path_14());
    test_path(ctx, rtc.get(), create_path_15());
    test_path(ctx, rtc.get(), create_path_16());
    SkMatrix nonInvertibleMatrix = SkMatrix::MakeScale(0, 0);
    sk_sp<GrFragmentProcessor> fp(create_linear_gradient_processor(ctx));
    test_path(ctx, rtc.get(), create_path_17(), nonInvertibleMatrix, GrAAType::kCoverage, fp);
    test_path(ctx, rtc.get(), create_path_18());
}
#endif