blob: 6e4e5476f9d0c2558549af9bacc37917cd8650f6 [file] [log] [blame]
/*
* 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);
}
}