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paint_utils.cc
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paint_utils.cc
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/flow/paint_utils.h"
#include <stdlib.h>
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkShader.h"
namespace flutter {
namespace {
sk_sp<SkShader> CreateCheckerboardShader(SkColor c1, SkColor c2, int size) {
SkBitmap bm;
bm.allocN32Pixels(2 * size, 2 * size);
bm.eraseColor(c1);
bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2);
bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2);
return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
SkSamplingOptions());
}
} // anonymous namespace
void DrawCheckerboard(SkCanvas* canvas, SkColor c1, SkColor c2, int size) {
SkPaint paint;
paint.setShader(CreateCheckerboardShader(c1, c2, size));
canvas->drawPaint(paint);
}
void DrawCheckerboard(SkCanvas* canvas, const SkRect& rect) {
// Draw a checkerboard
canvas->save();
canvas->clipRect(rect);
auto checkerboard_color =
SkColorSetARGB(64, rand() % 256, rand() % 256, rand() % 256);
DrawCheckerboard(canvas, checkerboard_color, 0x00000000, 12);
canvas->restore();
// Stroke the drawn area
SkPaint debugPaint;
debugPaint.setStrokeWidth(8);
debugPaint.setColor(SkColorSetA(checkerboard_color, 255));
debugPaint.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(rect, debugPaint);
}
} // namespace flutter