| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPathEffect.h" |
| #include "include/core/SkPathMeasure.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkDashPathEffect.h" |
| #include "include/utils/SkParsePath.h" |
| #include "src/base/SkRandom.h" |
| #include "src/core/SkOSFile.h" |
| |
| #include <stdio.h> |
| |
| /* The test below generates a reference image using SVG. To compare the result for correctness, |
| enable the define below and then view the generated SVG in a browser. |
| */ |
| static constexpr bool GENERATE_SVG_REFERENCE = false; |
| |
| /* |
| The arcto test below should draw the same as this SVG: |
| (Note that Skia's arcTo Direction parameter value is opposite SVG's sweep value, e.g. 0 / 1) |
| |
| <svg width="500" height="600"> |
| <path d="M 50,100 A50,50, 0,0,1, 150,200" style="stroke:#660000; fill:none; stroke-width:2" /> |
| <path d="M100,100 A50,100, 0,0,1, 200,200" style="stroke:#660000; fill:none; stroke-width:2" /> |
| <path d="M150,100 A50,50, 45,0,1, 250,200" style="stroke:#660000; fill:none; stroke-width:2" /> |
| <path d="M200,100 A50,100, 45,0,1, 300,200" style="stroke:#660000; fill:none; stroke-width:2" /> |
| |
| <path d="M150,200 A50,50, 0,1,0, 150,300" style="stroke:#660000; fill:none; stroke-width:2" /> |
| <path d="M200,200 A50,100, 0,1,0, 200,300" style="stroke:#660000; fill:none; stroke-width:2" /> |
| <path d="M250,200 A50,50, 45,1,0, 250,300" style="stroke:#660000; fill:none; stroke-width:2" /> |
| <path d="M300,200 A50,100, 45,1,0, 300,300" style="stroke:#660000; fill:none; stroke-width:2" /> |
| |
| <path d="M250,400 A120,80 0 0,0 250,500" |
| fill="none" stroke="red" stroke-width="5" /> |
| |
| <path d="M250,400 A120,80 0 1,1 250,500" |
| fill="none" stroke="green" stroke-width="5"/> |
| |
| <path d="M250,400 A120,80 0 1,0 250,500" |
| fill="none" stroke="purple" stroke-width="5"/> |
| |
| <path d="M250,400 A120,80 0 0,1 250,500" |
| fill="none" stroke="blue" stroke-width="5"/> |
| |
| <path d="M100,100 A 0, 0 0 0,1 200,200" |
| fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/> |
| |
| <path d="M200,100 A 80,80 0 0,1 200,100" |
| fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/> |
| </svg> |
| */ |
| |
| DEF_SIMPLE_GM(arcto, canvas, 500, 600) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeWidth(2); |
| paint.setColor(0xFF660000); |
| // canvas->scale(2, 2); // for testing on retina |
| SkRect oval = SkRect::MakeXYWH(100, 100, 100, 100); |
| |
| for (SkScalar angle = 0; angle <= 45; angle += 45) { |
| for (int oHeight = 2; oHeight >= 1; --oHeight) { |
| SkPathBuilder svgArc; |
| SkScalar ovalHeight = oval.height() / oHeight; |
| svgArc.moveTo(oval.fLeft, oval.fTop); |
| svgArc.arcTo({oval.width() / 2, ovalHeight}, angle, SkPathBuilder::kSmall_ArcSize, |
| SkPathDirection::kCW, {oval.right(), oval.bottom()}); |
| canvas->drawPath(svgArc.detach(), paint); |
| |
| svgArc.moveTo(oval.fLeft + 100, oval.fTop + 100); |
| svgArc.arcTo({oval.width() / 2, ovalHeight}, angle, SkPathBuilder::kLarge_ArcSize, |
| SkPathDirection::kCCW, {oval.right(), oval.bottom() + 100}); |
| canvas->drawPath(svgArc.detach(), paint); |
| oval.offset(50, 0); |
| |
| } |
| } |
| |
| paint.setStrokeWidth(5); |
| const SkColor purple = 0xFF800080; |
| const SkColor darkgreen = 0xFF008000; |
| const SkColor colors[] = { SK_ColorRED, darkgreen, purple, SK_ColorBLUE }; |
| const char* arcstrs[] = { |
| "M250,400 A120,80 0 0,0 250,500", |
| "M250,400 A120,80 0 1,1 250,500", |
| "M250,400 A120,80 0 1,0 250,500", |
| "M250,400 A120,80 0 0,1 250,500" |
| }; |
| int cIndex = 0; |
| for (const char* arcstr : arcstrs) { |
| SkPath path; |
| SkParsePath::FromSVGString(arcstr, &path); |
| paint.setColor(colors[cIndex++]); |
| canvas->drawPath(path, paint); |
| } |
| |
| // test that zero length arcs still draw round cap |
| paint.setStrokeCap(SkPaint::kRound_Cap); |
| SkPathBuilder path; |
| path.moveTo(100, 100) |
| .arcTo({0, 0}, 0, SkPathBuilder::kLarge_ArcSize, SkPathDirection::kCW, {200, 200}); |
| canvas->drawPath(path.detach(), paint); |
| |
| path.moveTo(200, 100) |
| .arcTo({80, 80}, 0, SkPathBuilder::kLarge_ArcSize, SkPathDirection::kCW, {200, 100}); |
| canvas->drawPath(path.detach(), paint); |
| } |
| |
| enum { |
| kParsePathTestDimension = 500 |
| }; |
| |
| const struct Legal { |
| char fSymbol; |
| int fScalars; |
| } gLegal[] = { |
| { 'M', 2 }, |
| { 'H', 1 }, |
| { 'V', 1 }, |
| { 'L', 2 }, |
| { 'Q', 4 }, |
| { 'T', 2 }, |
| { 'C', 6 }, |
| { 'S', 4 }, |
| { 'A', 4 }, |
| { 'Z', 0 }, |
| }; |
| |
| bool gEasy = false; // set to true while debugging to suppress unusual whitespace |
| |
| // mostly do nothing, then bias towards spaces |
| const char gWhiteSpace[] = { 0, 0, 0, 0, 0, 0, 0, 0, ' ', ' ', ' ', ' ', 0x09, 0x0D, 0x0A }; |
| |
| static void add_white(SkRandom* rand, SkString* atom) { |
| if (gEasy) { |
| atom->append(" "); |
| return; |
| } |
| int reps = rand->nextRangeU(0, 2); |
| for (int rep = 0; rep < reps; ++rep) { |
| int index = rand->nextRangeU(0, (int) std::size(gWhiteSpace) - 1); |
| if (gWhiteSpace[index]) { |
| atom->append(&gWhiteSpace[index], 1); |
| } |
| } |
| } |
| |
| static void add_comma(SkRandom* rand, SkString* atom) { |
| if (gEasy) { |
| atom->append(","); |
| return; |
| } |
| size_t count = atom->size(); |
| add_white(rand, atom); |
| if (rand->nextBool()) { |
| atom->append(","); |
| } |
| do { |
| add_white(rand, atom); |
| } while (count == atom->size()); |
| } |
| |
| static void add_some_white(SkRandom* rand, SkString* atom) { |
| size_t count = atom->size(); |
| do { |
| add_white(rand, atom); |
| } while (count == atom->size()); |
| } |
| |
| static SkString make_random_svg_path(SkRandom* rand) { |
| SkString atom; |
| int legalIndex = rand->nextRangeU(0, (int) std::size(gLegal) - 1); |
| const Legal& legal = gLegal[legalIndex]; |
| gEasy ? atom.append("\n") : add_white(rand, &atom); |
| char symbol = legal.fSymbol | (rand->nextBool() ? 0x20 : 0); |
| atom.append(&symbol, 1); |
| int reps = rand->nextRangeU(1, 3); |
| for (int rep = 0; rep < reps; ++rep) { |
| for (int index = 0; index < legal.fScalars; ++index) { |
| SkScalar coord = rand->nextRangeF(0, 100); |
| add_white(rand, &atom); |
| atom.appendScalar(coord); |
| if (rep < reps - 1 && index < legal.fScalars - 1) { |
| add_comma(rand, &atom); |
| } else { |
| add_some_white(rand, &atom); |
| } |
| if ('A' == legal.fSymbol && 1 == index) { |
| atom.appendScalar(rand->nextRangeF(-720, 720)); |
| add_comma(rand, &atom); |
| atom.appendU32(rand->nextRangeU(0, 1)); |
| add_comma(rand, &atom); |
| atom.appendU32(rand->nextRangeU(0, 1)); |
| add_comma(rand, &atom); |
| } |
| } |
| } |
| return atom; |
| } |
| |
| DEF_SIMPLE_GM(parsedpaths, canvas, kParsePathTestDimension, kParsePathTestDimension) { |
| SkString str; |
| FILE* file; |
| if (GENERATE_SVG_REFERENCE) { |
| file = sk_fopen("svgout.htm", kWrite_SkFILE_Flag); |
| str.printf("<svg width=\"%d\" height=\"%d\">\n", kParsePathTestDimension, |
| kParsePathTestDimension); |
| sk_fwrite(str.c_str(), str.size(), file); |
| } |
| SkRandom rand; |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| for (int xStart = 0; xStart < kParsePathTestDimension; xStart += 100) { |
| canvas->save(); |
| for (int yStart = 0; yStart < kParsePathTestDimension; yStart += 100) { |
| if (GENERATE_SVG_REFERENCE) { |
| str.printf("<g transform='translate(%d,%d) scale(%d,%d)'>\n", xStart, yStart, |
| 1, 1); |
| sk_fwrite(str.c_str(), str.size(), file); |
| str.printf("<clipPath id='clip_%d_%d'>\n", xStart, yStart); |
| sk_fwrite(str.c_str(), str.size(), file); |
| str.printf("<rect width='100' height='100' x='0' y='0'></rect>\n"); |
| sk_fwrite(str.c_str(), str.size(), file); |
| str.printf("</clipPath>\n"); |
| sk_fwrite(str.c_str(), str.size(), file); |
| } |
| int count = 3; |
| do { |
| SkPath path; |
| SkString spec; |
| uint32_t y = rand.nextRangeU(30, 70); |
| uint32_t x = rand.nextRangeU(30, 70); |
| spec.printf("M %u,%u\n", x, y); |
| for (uint32_t i = rand.nextRangeU(0, 10); i--; ) { |
| spec.append(make_random_svg_path(&rand)); |
| } |
| SkAssertResult(SkParsePath::FromSVGString(spec.c_str(), &path)); |
| paint.setColor(rand.nextU()); |
| canvas->save(); |
| canvas->clipRect(SkRect::MakeIWH(100, 100)); |
| canvas->drawPath(path, paint); |
| canvas->restore(); |
| if (GENERATE_SVG_REFERENCE) { |
| str.printf("<path d='\n"); |
| sk_fwrite(str.c_str(), str.size(), file); |
| sk_fwrite(spec.c_str(), spec.size(), file); |
| str.printf("\n' fill='#%06x' fill-opacity='%g'", paint.getColor() & 0xFFFFFF, |
| paint.getAlpha() / 255.f); |
| sk_fwrite(str.c_str(), str.size(), file); |
| str.printf(" clip-path='url(#clip_%d_%d)'/>\n", xStart, yStart); |
| sk_fwrite(str.c_str(), str.size(), file); |
| } |
| } while (--count > 0); |
| if (GENERATE_SVG_REFERENCE) { |
| str.printf("</g>\n"); |
| sk_fwrite(str.c_str(), str.size(), file); |
| } |
| canvas->translate(0, 100); |
| } |
| canvas->restore(); |
| canvas->translate(100, 0); |
| } |
| if (GENERATE_SVG_REFERENCE) { |
| const char trailer[] = "</svg>\n"; |
| sk_fwrite(trailer, sizeof(trailer) - 1, file); |
| sk_fclose(file); |
| } |
| } |
| |
| DEF_SIMPLE_GM(bug593049, canvas, 300, 300) { |
| canvas->translate(111, 0); |
| |
| SkPathBuilder p; |
| p.moveTo(-43.44464063610148f, 79.43535936389853f); |
| const SkScalar yOffset = 122.88f; |
| const SkScalar radius = 61.44f; |
| SkRect oval = SkRect::MakeXYWH(-radius, yOffset - radius, 2 * radius, 2 * radius); |
| p.arcTo(oval, 1.25f * 180, .5f * 180, false); |
| |
| SkPaint paint; |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeCap(SkPaint::kRound_Cap); |
| paint.setStrokeWidth(15.36f); |
| |
| canvas->drawPath(p.detach(), paint); |
| } |
| |
| DEF_SIMPLE_GM(bug583299, canvas, 300, 300) { |
| const char* d="M60,60 A50,50 0 0 0 160,60 A50,50 0 0 0 60,60z"; |
| SkPaint p; |
| p.setStyle(SkPaint::kStroke_Style); |
| p.setStrokeWidth(100); |
| p.setAntiAlias(true); |
| p.setColor(0xFF008200); |
| p.setStrokeCap(SkPaint::kSquare_Cap); |
| SkPath path; |
| SkParsePath::FromSVGString(d, &path); |
| SkPathMeasure meas(path, false); |
| SkScalar length = meas.getLength(); |
| SkScalar intervals[] = {0, length }; |
| int intervalCount = (int) std::size(intervals); |
| p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0)); |
| canvas->drawPath(path, p); |
| } |