1 /* 2 * Copyright 2020 Google LLC 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/SkCanvas.h" 10 #include "include/core/SkColor.h" 11 #include "include/core/SkMatrix.h" 12 13 DEF_SIMPLE_GM(crbug_10141204, canvas, 512, 512) { 14 // While the coordinates are giant and the transform is not axis-aligned, this should 15 // fill the screen left side with solid blue. This has an extra zoom factor compared to the 16 // canvas JS in order to more visibly highlight the numerical issues that caused the bug. 17 // (The original transform would have completely filled the screen with solid blue, so the bug 18 // manifested as an improper discard on occasion. With the new scale factor, the bug manifests 19 // as either an improper fullscreen clear or an improper discard, instead). 20 SkScalar extraZoom = exp(-2.3f); 21 canvas->scale(extraZoom, extraZoom); 22 canvas->scale(2.f, 2.f); 23 canvas->concat(SkMatrix::MakeAll( 24 -0.0005550860255665798f, -0.0030798374421905717f, -0.014111959825129805f, 25 -0.07569627776417084f, 232.00000000000017f, 39.999999999999936f, 26 0.f, 0.f, 1.f)); 27 canvas->translate(-3040103.0493857153f, 337502.1103282161f); 28 canvas->scale(9783.93962050256f, -9783.93962050256f); 29 30 SkPaint paint; 31 paint.setColor(SK_ColorBLUE); 32 paint.setAntiAlias(true); 33 canvas->drawRect(SkRect::MakeWH(512, 512), paint); 34 } 35