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- /*
- * 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 "gm/gm.h"
- #include "include/core/SkBlendMode.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPath.h"
- #include "include/core/SkRect.h"
- DEF_SIMPLE_GM(PlusMergesAA, canvas, 256, 256) {
- SkPaint p;
- p.setColor(SK_ColorRED);
- p.setAntiAlias(true); // <-- crucial to the test that we use AA
- // Draw a two red squares.
- canvas->drawRect(SkRect::MakeWH(100, 100), p);
- canvas->drawRect(SkRect::MakeXYWH(150, 0, 100, 100), p);
- p.setColor(0xf000ff00);
- // We'll draw a green square on top of each using two triangles.
- SkPath upperLeft;
- upperLeft.lineTo(100, 0);
- upperLeft.lineTo(0, 100);
- upperLeft.lineTo(0, 0);
- SkPath bottomRight;
- bottomRight.moveTo(100, 0);
- bottomRight.lineTo(100, 100);
- bottomRight.lineTo(0, 100);
- bottomRight.lineTo(100, 0);
- // The left square is drawn simply with SrcOver. It will show a red seam.
- canvas->drawPath(upperLeft, p);
- canvas->drawPath(bottomRight, p);
- // Using Plus on the right should merge the AA of seam together completely covering the red.
- canvas->saveLayer(nullptr, nullptr);
- p.setBlendMode(SkBlendMode::kPlus);
- canvas->translate(150, 0);
- canvas->drawPath(upperLeft, p);
- canvas->drawPath(bottomRight, p);
- canvas->restore();
- }
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