274 lines
9.9 KiB
C++
274 lines
9.9 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPathBuilder.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkTypes.h"
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#include "include/private/SkTArray.h"
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namespace skiagm {
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class HairlinesGM : public GM {
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protected:
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SkString onShortName() override {
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return SkString("hairlines");
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}
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SkISize onISize() override { return SkISize::Make(1250, 1250); }
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void onOnceBeforeDraw() override {
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{
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SkPathBuilder lineAngles;
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enum {
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kNumAngles = 15,
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kRadius = 40,
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};
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for (int i = 0; i < kNumAngles; ++i) {
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SkScalar angle = SK_ScalarPI * SkIntToScalar(i) / kNumAngles;
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SkScalar x = kRadius * SkScalarCos(angle);
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SkScalar y = kRadius * SkScalarSin(angle);
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lineAngles.moveTo(x, y).lineTo(-x, -y);
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}
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fPaths.push_back(lineAngles.detach());
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}
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fPaths.push_back(SkPathBuilder().moveTo(0, -10)
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.quadTo(100, 100, -10, 0)
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(0, -5)
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.quadTo(100, 100, -5, 0)
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(0, -2)
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.quadTo(100, 100, -2, 0)
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(0, -1)
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.quadTo(100, 100, -2 + 306.0f / 4, 75)
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(0, -1)
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.quadTo(100, 100, -1, 0)
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(0, -0)
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.quadTo(100, 100, 0, 0)
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(0, -0)
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.quadTo(100, 100, 75, 75)
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.detach());
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// Two problem cases for gpu hairline renderer found by shapeops testing. These used
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// to assert that the computed bounding box didn't contain all the vertices.
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fPaths.push_back(SkPathBuilder().moveTo(4, 6)
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.cubicTo(5, 6, 5, 4, 4, 0)
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.close()
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.detach());
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fPaths.push_back(SkPathBuilder().moveTo(5, 1)
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.lineTo( 4.32787323f, 1.67212653f)
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.cubicTo(2.75223875f, 3.24776125f,
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3.00581908f, 4.51236057f,
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3.7580452f, 4.37367964f)
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.cubicTo(4.66472578f, 3.888381f,
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5.f, 2.875f,
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5.f, 1.f)
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.close()
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.detach());
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// Three paths that show the same bug (missing end caps)
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fPaths.push_back(SkPathBuilder().moveTo(6.5f,5.5f)
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.lineTo(3.5f,0.5f)
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.moveTo(0.5f,5.5f)
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.lineTo(3.5f,0.5f)
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.detach());
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// An X (crbug.com/137317)
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fPaths.push_back(SkPathBuilder().moveTo(1, 1)
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.lineTo(6, 6)
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.moveTo(1, 6)
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.lineTo(6, 1)
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.detach());
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// A right angle (crbug.com/137465 and crbug.com/256776)
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fPaths.push_back(SkPathBuilder().moveTo(5.5f, 5.5f)
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.lineTo(5.5f, 0.5f)
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.lineTo(0.5f, 0.5f)
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.detach());
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{
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// Arc example to test imperfect truncation bug (crbug.com/295626)
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constexpr SkScalar kRad = SkIntToScalar(2000);
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constexpr SkScalar kStartAngle = 262.59717f;
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constexpr SkScalar kSweepAngle = SkScalarHalf(17.188717f);
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SkPathBuilder bug;
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// Add a circular arc
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SkRect circle = SkRect::MakeLTRB(-kRad, -kRad, kRad, kRad);
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bug.addArc(circle, kStartAngle, kSweepAngle);
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// Now add the chord that should cap the circular arc
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SkPoint p0 = { kRad * SkScalarCos(SkDegreesToRadians(kStartAngle)),
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kRad * SkScalarSin(SkDegreesToRadians(kStartAngle)) };
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SkPoint p1 = { kRad * SkScalarCos(SkDegreesToRadians(kStartAngle + kSweepAngle)),
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kRad * SkScalarSin(SkDegreesToRadians(kStartAngle + kSweepAngle)) };
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bug.moveTo(p0);
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bug.lineTo(p1);
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fPaths.push_back(bug.detach());
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}
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}
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void onDraw(SkCanvas* canvas) override {
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constexpr SkAlpha kAlphaValue[] = { 0xFF, 0x40 };
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constexpr SkScalar kWidths[] = { 0, 0.5f, 1.5f };
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enum {
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kMargin = 5,
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};
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int wrapX = 1250 - kMargin;
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SkScalar maxH = 0;
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canvas->translate(SkIntToScalar(kMargin), SkIntToScalar(kMargin));
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canvas->save();
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SkScalar x = SkIntToScalar(kMargin);
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for (int p = 0; p < fPaths.count(); ++p) {
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for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphaValue); ++a) {
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for (int aa = 0; aa < 2; ++aa) {
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for (size_t w = 0; w < SK_ARRAY_COUNT(kWidths); w++) {
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const SkRect& bounds = fPaths[p].getBounds();
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if (x + bounds.width() > wrapX) {
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canvas->restore();
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canvas->translate(0, maxH + SkIntToScalar(kMargin));
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canvas->save();
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maxH = 0;
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x = SkIntToScalar(kMargin);
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}
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SkPaint paint;
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paint.setARGB(kAlphaValue[a], 0, 0, 0);
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paint.setAntiAlias(SkToBool(aa));
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(kWidths[w]);
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canvas->save();
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canvas->translate(-bounds.fLeft, -bounds.fTop);
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canvas->drawPath(fPaths[p], paint);
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canvas->restore();
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maxH = std::max(maxH, bounds.height());
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SkScalar dx = bounds.width() + SkIntToScalar(kMargin);
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x += dx;
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canvas->translate(dx, 0);
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}
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}
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}
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}
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canvas->restore();
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}
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private:
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SkTArray<SkPath> fPaths;
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using INHERITED = GM;
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};
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static void draw_squarehair_tests(SkCanvas* canvas, SkScalar width, SkPaint::Cap cap, bool aa) {
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SkPaint paint;
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paint.setStrokeCap(cap);
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paint.setStrokeWidth(width);
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paint.setAntiAlias(aa);
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawLine(10, 10, 20, 10, paint);
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canvas->drawLine(30, 10, 30, 20, paint);
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canvas->drawLine(40, 10, 50, 20, paint);
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SkPathBuilder path;
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path.moveTo(60, 10);
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path.quadTo(60, 20, 70, 20);
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path.conicTo(70, 10, 80, 10, 0.707f);
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canvas->drawPath(path.detach(), paint);
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path.moveTo(90, 10);
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path.cubicTo(90, 20, 100, 20, 100, 10);
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path.lineTo(110, 10);
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canvas->drawPath(path.detach(), paint);
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canvas->translate(0, 30);
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}
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DEF_SIMPLE_GM(squarehair, canvas, 240, 360) {
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const bool aliases[] = { false, true };
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const SkScalar widths[] = { 0, 0.999f, 1, 1.001f };
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const SkPaint::Cap caps[] = { SkPaint::kButt_Cap, SkPaint::kSquare_Cap, SkPaint::kRound_Cap };
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for (auto alias : aliases) {
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canvas->save();
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for (auto width : widths) {
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for (auto cap : caps) {
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draw_squarehair_tests(canvas, width, cap, alias);
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}
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}
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canvas->restore();
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canvas->translate(120, 0);
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}
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}
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// GM to test subdivision of hairlines
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static void draw_subdivided_quad(SkCanvas* canvas, int x0, int y0, int x1, int y1, SkColor color) {
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SkPaint paint;
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paint.setStrokeWidth(1);
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setColor(color);
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canvas->drawPath(SkPathBuilder().moveTo(0,0)
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.quadTo(SkIntToScalar(x0), SkIntToScalar(y0),
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SkIntToScalar(x1), SkIntToScalar(y1))
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.detach(),
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paint);
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}
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DEF_SIMPLE_GM(hairline_subdiv, canvas, 512, 256) {
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// no subdivisions
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canvas->translate(45, -25);
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draw_subdivided_quad(canvas, 334, 334, 467, 267, SK_ColorBLACK);
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// one subdivision
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canvas->translate(-185, -150);
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draw_subdivided_quad(canvas, 472, 472, 660, 378, SK_ColorRED);
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// two subdivisions
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canvas->translate(-275, -200);
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draw_subdivided_quad(canvas, 668, 668, 934, 535, SK_ColorGREEN);
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// three subdivisions
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canvas->translate(-385, -260);
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draw_subdivided_quad(canvas, 944, 944, 1320, 756, SK_ColorBLUE);
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}
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM( return new HairlinesGM; )
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} // namespace skiagm
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