Tessellating GPU path renderer.

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.
+ */
+
+#if SK_SUPPORT_GPU
+#include "GrContextFactory.h"
+#include "GrTessellatingPathRenderer.h"
+#include "GrTest.h"
+#include "Test.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 void test_path(GrDrawTarget* dt, GrRenderTarget* rt, const SkPath& path) {
+    GrTessellatingPathRenderer tess;
+    GrPipelineBuilder pipelineBuilder;
+    pipelineBuilder.setRenderTarget(rt);
+    SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
+    tess.drawPath(dt, &pipelineBuilder, SK_ColorWHITE, SkMatrix::I(), path, stroke, false);
+}
+
+DEF_GPUTEST(TessellatingPathRendererTests, reporter, factory) {
+    GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
+    GrSurfaceDesc desc;
+    desc.fFlags = kRenderTarget_GrSurfaceFlag;
+    desc.fWidth = 800;
+    desc.fHeight = 800;
+    desc.fConfig = kSkia8888_GrPixelConfig;
+    desc.fOrigin = kTopLeft_GrSurfaceOrigin;
+    SkAutoTUnref<GrTexture> texture(
+        context->refScratchTexture(desc, GrContext::kExact_ScratchTexMatch)
+    );
+    GrTestTarget tt;
+    context->getTestTarget(&tt);
+    GrRenderTarget* rt = texture->asRenderTarget();
+    GrDrawTarget* dt = tt.target();
+
+    test_path(dt, rt, create_path_0());
+    test_path(dt, rt, create_path_1());
+    test_path(dt, rt, create_path_2());
+    test_path(dt, rt, create_path_3());
+    test_path(dt, rt, create_path_4());
+    test_path(dt, rt, create_path_5());
+    test_path(dt, rt, create_path_6());
+    test_path(dt, rt, create_path_7());
+    test_path(dt, rt, create_path_8());
+    test_path(dt, rt, create_path_9());
+    test_path(dt, rt, create_path_10());
+    test_path(dt, rt, create_path_11());
+    test_path(dt, rt, create_path_12());
+    test_path(dt, rt, create_path_13());
+    test_path(dt, rt, create_path_14());
+}
+#endif