| /* |
| * Copyright 2019 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/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| |
| /** |
| * Repro case for https://bugs.chromium.org/p/chromium/issues/detail?id=913223 |
| * |
| * The original bug was filed against square caps, but here we also draw the labyrinth using round |
| * and butt caps. |
| * |
| * Square and round caps expose over-coverage on overlaps when using coverage counting. |
| * |
| * Butt caps expose under-coverage on abutted strokes when using a 'max()' coverage function. |
| */ |
| static void draw_labyrinth(SkCanvas* canvas, SkPaint::Cap cap) { |
| constexpr static bool kRows[11][12] = { |
| {1,1,1,1,1,1,1,1,1,1,1,1}, |
| {0,1,0,1,0,1,0,0,0,0,1,1}, |
| {0,0,0,0,1,0,0,0,0,1,1,1}, |
| {1,0,1,0,0,0,0,1,0,0,0,0}, |
| {0,1,1,0,0,0,0,0,0,1,1,1}, |
| {1,0,0,1,0,0,0,0,1,1,1,0}, |
| {0,1,0,1,1,1,0,0,1,1,1,0}, |
| {1,0,1,0,1,1,1,1,0,1,1,1}, |
| {0,0,1,0,0,1,0,0,0,0,0,1}, |
| {0,1,1,1,0,0,1,1,1,1,0,0}, |
| {1,1,1,1,1,1,1,1,1,1,1,1}, |
| }; |
| |
| constexpr static bool kCols[13][10] = { |
| {1,1,1,1,0,1,1,1,1,1}, |
| {0,0,1,0,0,0,1,1,1,0}, |
| {0,1,1,0,1,1,1,0,0,1}, |
| {1,1,0,0,0,0,1,0,1,0}, |
| {0,0,1,0,1,0,0,0,0,1}, |
| {0,0,1,1,1,0,0,0,1,0}, |
| {0,1,0,1,1,1,0,0,0,0}, |
| {1,1,1,0,1,1,1,0,1,0}, |
| {1,1,0,1,1,0,0,0,1,0}, |
| {0,0,1,0,0,0,0,0,0,1}, |
| {0,0,1,1,0,0,0,0,1,0}, |
| {0,0,0,0,0,0,1,0,0,1}, |
| {1,1,1,1,1,1,0,1,1,1}, |
| }; |
| |
| SkPathBuilder maze; |
| for (size_t y = 0; y < std::size(kRows); ++y) { |
| for (size_t x = 0; x < std::size(kRows[0]); ++x) { |
| if (kRows[y][x]) { |
| maze.moveTo(x, y); |
| maze.lineTo(x+1, y); |
| } |
| } |
| } |
| for (size_t x = 0; x < std::size(kCols); ++x) { |
| for (size_t y = 0; y < std::size(kCols[0]); ++y) { |
| if (kCols[x][y]) { |
| maze.moveTo(x, y); |
| maze.lineTo(x, y+1); |
| } |
| } |
| } |
| |
| SkPaint paint; |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeWidth(.1f); |
| paint.setColor(0xff406060); |
| paint.setAntiAlias(true); |
| paint.setStrokeCap(cap); |
| |
| canvas->translate(10.5, 10.5); |
| canvas->scale(40, 40); |
| canvas->drawPath(maze.detach(), paint); |
| } |
| |
| constexpr static int kWidth = 500; |
| constexpr static int kHeight = 420; |
| |
| DEF_SIMPLE_GM(labyrinth_square, canvas, kWidth, kHeight) { |
| draw_labyrinth(canvas, SkPaint::kSquare_Cap); |
| } |
| |
| DEF_SIMPLE_GM(labyrinth_round, canvas, kWidth, kHeight) { |
| draw_labyrinth(canvas, SkPaint::kRound_Cap); |
| } |
| |
| DEF_SIMPLE_GM(labyrinth_butt, canvas, kWidth, kHeight) { |
| draw_labyrinth(canvas, SkPaint::kButt_Cap); |
| } |