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 /* * Copyright 2020 Google LLC * * 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/SkMatrix.h" #include "include/core/SkRect.h" // This tests a scenario where when the 2D projection of a perspective quad is inset we degenerate // the inset 2d geometry to a triangle because an inset vertex crosses the opposite edge. When we // project back to 3D and try to move the original verts along the original edges so that they // project to the 2D points. Whether an edge can be moved along depends on whether the adjacent edge // at the vertex is AA. However, in the degenerate triangle case the 2D point may not fall along // either of the edges. Thus, if we're constrained to moving along one edge and solve for X or Y the // other value may go wildly away from projecting to the 2D value. The current approach is to force // AA on at both edges that meet at a vertex whose inset point has been replaced by an off-edge // point if either is AA originally. This gives us an additional vector to move along so that we can // find a 3D point that projects to the 2D point in both X and Y. DEF_SIMPLE_GM(crbug_1162942, canvas, 620, 200) { // Matrix and quad values taken from Chrome repro scenario. SkMatrix ctm = SkMatrix::MakeAll( SkBits2Float(0x3FCC7F75), SkBits2Float(0x3D5784FC), SkBits2Float(0x44C48C99), SkBits2Float(0x3F699F7F), SkBits2Float(0x3E0A0D37), SkBits2Float(0x43908518), SkBits2Float(0x3AA17423), SkBits2Float(0x3A6CCDC3), SkBits2Float(0x3F2EFEEC)); ctm.postTranslate(-1500.f, -325.f); SkPoint pts[4] = {{SkBits2Float(0x3F39778B), SkBits2Float(0x43FF7FFC)}, {SkBits2Float(0x0), SkBits2Float(0x43FF7FFA)}, {SkBits2Float(0xB83B055E), SkBits2Float(0x42500003)}, {SkBits2Float(0x3F39776F), SkBits2Float(0x4250000D)}}; SkRect bounds; bounds.setBounds(pts, 4); canvas->clear(SK_ColorWHITE); SkCanvas::QuadAAFlags flags[] = { (SkCanvas::QuadAAFlags) (SkCanvas::kTop_QuadAAFlag | SkCanvas::kLeft_QuadAAFlag ), (SkCanvas::QuadAAFlags) (SkCanvas::kBottom_QuadAAFlag | SkCanvas::kRight_QuadAAFlag), (SkCanvas::QuadAAFlags) (SkCanvas::kBottom_QuadAAFlag), (SkCanvas::QuadAAFlags) (SkCanvas::kRight_QuadAAFlag), (SkCanvas::QuadAAFlags) (SkCanvas::kRight_QuadAAFlag | SkCanvas::kLeft_QuadAAFlag), (SkCanvas::QuadAAFlags) (SkCanvas::kTop_QuadAAFlag | SkCanvas::kBottom_QuadAAFlag), }; SkColor color = SK_ColorGREEN; for (auto aaFlags : flags) { canvas->save(); canvas->concat(ctm); canvas->experimental_DrawEdgeAAQuad(bounds, pts, aaFlags, color, SkBlendMode::kSrcOver); SkColor rgb = color & 0x00FFFFFF; color = 0xFF000000 | (rgb << 4) | (rgb >> 20); canvas->restore(); canvas->translate(0, 25); } }