1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm/gm.h" 9 #include "include/core/SkBlendMode.h" 10 #include "include/core/SkCanvas.h" 11 #include "include/core/SkPaint.h" 12 #include "include/core/SkRect.h" 13 14 // The root cause of this bug was that when dual source blending was not supported and we made a 15 // copy of the destination to perform blending we would clip the copy bounds to the current clip. 16 // However, it is possible for anti-aliased that are fully contained by the clip in a geometric 17 // sense to actually draw outside the clip in pixel space because we don't consider aa bloat when 18 // determining if the draw is contained by the clip. 19 DEF_SIMPLE_GM(crbug_892988, canvas, 256, 256) { 20 SkPaint paint1; 21 paint1.setStyle(SkPaint::kStroke_Style); 22 paint1.setStrokeWidth(1.f); 23 paint1.setAntiAlias(true); 24 canvas->drawRect(SkRect::MakeLTRB(11.5, 0.5, 245.5, 245.5), paint1); 25 canvas->clipRect(SkRect::MakeLTRB(12, 1, 244, 244), true); 26 SkPaint paint2; 27 // Use src mode with a non-opaque color to produce a blend that can't be handled with 28 // simple blend coefficients. 29 paint2.setColor(0xF0FFFFFF); 30 paint2.setBlendMode(SkBlendMode::kSrc); 31 paint2.setAntiAlias(true); 32 canvas->drawRect(SkRect::MakeLTRB(12, 1, 244, 244), paint2); 33 } 34