| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-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/SkFont.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkTypes.h" |
| |
| // This GM shows off a flaw in delta-based rasterizers (DAA, CCPR, etc.). |
| // See also the bottom of dashing4 and skia:6886. |
| |
| static const int K = 49; |
| |
| DEF_SIMPLE_GM(daa, canvas, K+350, 5*K) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| { |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawString("Should be a green square with no red showing through.", |
| K*1.5f, K*0.5f, SkFont(), paint); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->drawRect({0,0,K,K}, paint); |
| |
| SkPoint tri1[] = {{0,0},{K,K},{0,K},{0,0}}; |
| SkPoint tri2[] = {{0,0},{K,K},{K,0},{0,0}}; |
| SkPath path = SkPathBuilder().addPolygon(tri1, std::size(tri1), false) |
| .addPolygon(tri2, std::size(tri2), false) |
| .detach(); |
| |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawPath(path, paint); |
| } |
| |
| canvas->translate(0,K); |
| { |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawString("Adjacent rects, two draws. Blue then green, no red?", |
| K*1.5f, K*0.5f, SkFont(), paint); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->drawRect({0,0,K,K}, paint); |
| |
| { |
| SkPath path = SkPath::Polygon({{0,0},{0,K},{K*0.5f,K},{K*0.5f,0}}, false); |
| paint.setColor(SK_ColorBLUE); |
| canvas->drawPath(path, paint); |
| } |
| |
| { |
| SkPath path = SkPath::Polygon({{K*0.5f,0},{K*0.5f,K},{K,K},{K,0}}, false); |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawPath(path, paint); |
| } |
| } |
| |
| canvas->translate(0,K); |
| { |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawString("Adjacent rects, wound together. All green?", |
| K*1.5f, K*0.5f, SkFont(), paint); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->drawRect({0,0,K,K}, paint); |
| |
| { |
| SkPath path = SkPathBuilder().addPolygon({{0,0},{0,K},{K*0.5f,K},{K*0.5f,0}}, false) |
| .addPolygon({{K*0.5f,0},{K*0.5f,K},{K,K},{K,0}}, false) |
| .detach(); |
| |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawPath(path, paint); |
| } |
| } |
| |
| canvas->translate(0,K); |
| { |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawString("Adjacent rects, wound opposite. All green?", |
| K*1.5f, K*0.5f, SkFont(), paint); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->drawRect({0,0,K,K}, paint); |
| |
| { |
| SkPath path = SkPathBuilder().addPolygon({{0,0},{0,K},{K*0.5f,K},{K*0.5f,0}}, false) |
| .addPolygon({{K*0.5f,0},{K,0},{K,K},{K*0.5f,K}}, false) |
| .detach(); |
| |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawPath(path, paint); |
| } |
| } |
| |
| canvas->translate(0,K); |
| { |
| paint.setColor(SK_ColorBLACK); |
| canvas->drawString("One poly, wound opposite. All green?", |
| K*1.5f, K*0.5f, SkFont(), paint); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->drawRect({0,0,K,K}, paint); |
| |
| SkPath path = SkPath::Polygon({{K*0.5f,0},{0,0},{0,K},{K*0.5f,K}, |
| {K*0.5f,0},{K,0},{K,K},{K*0.5f,K}}, |
| false); |
| |
| paint.setColor(SK_ColorGREEN); |
| canvas->drawPath(path, paint); |
| } |
| } |