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