/* * 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 "SampleCode.h" #include "SkCanvas.h" #include "SkInterpolator.h" #include "SkPath.h" #include "SkRRect.h" #include "SkTime.h" // This slide tests out the match up between BW clipping and rendering. It can // draw a large rect through some clip geometry and draw the same geometry // normally. Which one is drawn first can be toggled. The pair of objects is translated // fractionally (via an animator) to expose snapping bugs. The key bindings are: // 1-9: the different geometries // t: toggle which is drawn first the clip or the normal geometry // f: flip-flops which corner the bottom AA clip rect occupies in the complex clip cases // The possible geometric combinations to test enum Geometry { kRect_Geometry, kRRect_Geometry, kCircle_Geometry, kConvexPath_Geometry, kConcavePath_Geometry, kRectAndRect_Geometry, kRectAndRRect_Geometry, kRectAndConvex_Geometry, kRectAndConcave_Geometry }; // The basic rect used is [kMin,kMin]..[kMax,kMax] static const float kMin = 100.5f; static const float kMid = 200.0f; static const float kMax = 299.5f; // The translation applied to the base AA rect in the combination cases // (i.e., kRectAndRect through kRectAndConcave) static const float kXlate = 100.0f; SkRect create_rect(const SkPoint& offset) { SkRect r = SkRect::MakeLTRB(kMin, kMin, kMax, kMax); r.offset(offset); return r; } SkRRect create_rrect(const SkPoint& offset) { SkRRect rrect; rrect.setRectXY(create_rect(offset), 10, 10); return rrect; } SkRRect create_circle(const SkPoint& offset) { SkRRect circle; circle.setOval(create_rect(offset)); return circle; } SkPath create_convex_path(const SkPoint& offset) { SkPath convexPath; convexPath.moveTo(kMin, kMin); convexPath.lineTo(kMax, kMax); convexPath.lineTo(kMin, kMax); convexPath.close(); convexPath.offset(offset.fX, offset.fY); return convexPath; } SkPath create_concave_path(const SkPoint& offset) { SkPath concavePath; concavePath.moveTo(kMin, kMin); concavePath.lineTo(kMid, 105.0f); concavePath.lineTo(kMax, kMin); concavePath.lineTo(295.0f, kMid); concavePath.lineTo(kMax, kMax); concavePath.lineTo(kMid, 295.0f); concavePath.lineTo(kMin, kMax); concavePath.lineTo(105.0f, kMid); concavePath.close(); concavePath.offset(offset.fX, offset.fY); return concavePath; } static void draw_normal_geom(SkCanvas* canvas, const SkPoint& offset, int geom, bool useAA) { SkPaint p; p.setAntiAlias(useAA); p.setColor(SK_ColorBLACK); switch (geom) { case kRect_Geometry: // fall thru case kRectAndRect_Geometry: canvas->drawRect(create_rect(offset), p); break; case kRRect_Geometry: // fall thru case kRectAndRRect_Geometry: canvas->drawRRect(create_rrect(offset), p); break; case kCircle_Geometry: canvas->drawRRect(create_circle(offset), p); break; case kConvexPath_Geometry: // fall thru case kRectAndConvex_Geometry: canvas->drawPath(create_convex_path(offset), p); break; case kConcavePath_Geometry: // fall thru case kRectAndConcave_Geometry: canvas->drawPath(create_concave_path(offset), p); break; } } class ClipDrawMatchView : public SampleView { public: ClipDrawMatchView() : fTrans(2, 5), fGeom(kRect_Geometry), fClipFirst(true), fSign(1) { SkScalar values[2]; fTrans.setRepeatCount(999); values[0] = values[1] = 0; fTrans.setKeyFrame(0, GetMSecs() + 1000, values); values[1] = 1; fTrans.setKeyFrame(1, GetMSecs() + 2000, values); values[0] = values[1] = 1; fTrans.setKeyFrame(2, GetMSecs() + 3000, values); values[1] = 0; fTrans.setKeyFrame(3, GetMSecs() + 4000, values); values[0] = 0; fTrans.setKeyFrame(4, GetMSecs() + 5000, values); } protected: bool onQuery(SkEvent* evt) override { if (SampleCode::TitleQ(*evt)) { SampleCode::TitleR(evt, "ClipDrawMatch"); return true; } SkUnichar uni; if (SampleCode::CharQ(*evt, &uni)) { switch (uni) { case '1': fGeom = kRect_Geometry; return true; case '2': fGeom = kRRect_Geometry; return true; case '3': fGeom = kCircle_Geometry; return true; case '4': fGeom = kConvexPath_Geometry; return true; case '5': fGeom = kConcavePath_Geometry; return true; case '6': fGeom = kRectAndRect_Geometry; return true; case '7': fGeom = kRectAndRRect_Geometry; return true; case '8': fGeom = kRectAndConvex_Geometry; return true; case '9': fGeom = kRectAndConcave_Geometry; return true; case 'f': fSign = -fSign; return true; case 't': fClipFirst = !fClipFirst; return true; default: break; } } return this->INHERITED::onQuery(evt); } void drawClippedGeom(SkCanvas* canvas, const SkPoint& offset, bool useAA) { int count = canvas->save(); switch (fGeom) { case kRect_Geometry: canvas->clipRect(create_rect(offset), useAA); break; case kRRect_Geometry: canvas->clipRRect(create_rrect(offset), useAA); break; case kCircle_Geometry: canvas->clipRRect(create_circle(offset), useAA); break; case kConvexPath_Geometry: canvas->clipPath(create_convex_path(offset), useAA); break; case kConcavePath_Geometry: canvas->clipPath(create_concave_path(offset), useAA); break; case kRectAndRect_Geometry: { SkRect r = create_rect(offset); r.offset(fSign * kXlate, fSign * kXlate); canvas->clipRect(r, true); // AA here forces shader clips canvas->clipRect(create_rect(offset), useAA); } break; case kRectAndRRect_Geometry: { SkRect r = create_rect(offset); r.offset(fSign * kXlate, fSign * kXlate); canvas->clipRect(r, true); // AA here forces shader clips canvas->clipRRect(create_rrect(offset), useAA); } break; case kRectAndConvex_Geometry: { SkRect r = create_rect(offset); r.offset(fSign * kXlate, fSign * kXlate); canvas->clipRect(r, true); // AA here forces shader clips canvas->clipPath(create_convex_path(offset), useAA); } break; case kRectAndConcave_Geometry: { SkRect r = create_rect(offset); r.offset(fSign * kXlate, fSign * kXlate); canvas->clipRect(r, true); // AA here forces shader clips canvas->clipPath(create_concave_path(offset), useAA); } break; } SkISize size = canvas->getBaseLayerSize(); SkRect bigR = SkRect::MakeWH(SkIntToScalar(size.width()), SkIntToScalar(size.height())); SkPaint p; p.setColor(SK_ColorRED); canvas->drawRect(bigR, p); canvas->restoreToCount(count); } // Draw a big red rect through some clip geometry and also draw that same // geometry in black. The order in which they are drawn can be swapped. // This tests whether the clip and normally drawn geometry match up. void drawGeometry(SkCanvas* canvas, const SkPoint& offset, bool useAA) { if (fClipFirst) { this->drawClippedGeom(canvas, offset, useAA); } draw_normal_geom(canvas, offset, fGeom, useAA); if (!fClipFirst) { this->drawClippedGeom(canvas, offset, useAA); } } void onDrawContent(SkCanvas* canvas) override { SkScalar trans[2]; fTrans.timeToValues(GetMSecs(), trans); SkPoint offset; offset.set(trans[0], trans[1]); int saveCount = canvas->save(); this->drawGeometry(canvas, offset, false); canvas->restoreToCount(saveCount); } SkMSec GetMSecs() const { return static_cast(SkTime::GetMSecs() - fStart); } private: SkInterpolator fTrans; Geometry fGeom; bool fClipFirst; int fSign; const double fStart = SkTime::GetMSecs(); typedef SampleView INHERITED; }; ////////////////////////////////////////////////////////////////////////////// static SkView* MyFactory() { return new ClipDrawMatchView; } static SkViewRegister reg(MyFactory);