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- /*
- * Copyright 2019 Google Inc.
- *
- * 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/SkColor.h"
- #include "include/core/SkImageFilter.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPictureRecorder.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkTypes.h"
- #include "include/effects/SkBlurImageFilter.h"
- #include "include/effects/SkGradientShader.h"
- #include <initializer_list>
- // Make a noisy (with hard-edges) background, so we can see the effect of the blur
- //
- static sk_sp<SkShader> make_shader(SkScalar cx, SkScalar cy, SkScalar rad) {
- const SkColor colors[] = {
- SK_ColorRED, SK_ColorRED, SK_ColorBLUE, SK_ColorBLUE, SK_ColorGREEN, SK_ColorGREEN,
- SK_ColorRED, SK_ColorRED, SK_ColorBLUE, SK_ColorBLUE, SK_ColorGREEN, SK_ColorGREEN,
- };
- constexpr int count = SK_ARRAY_COUNT(colors);
- SkScalar pos[count] = { 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6 };
- for (int i = 0; i < count; ++i) {
- pos[i] *= 1.0f/6;
- }
- return SkGradientShader::MakeSweep(cx, cy, colors, pos, count);
- }
- static void do_draw(SkCanvas* canvas, bool useClip, bool useHintRect) {
- SkAutoCanvasRestore acr(canvas, true);
- canvas->clipRect({0, 0, 256, 256});
- const SkScalar cx = 128, cy = 128, rad = 100;
- SkPaint p;
- p.setShader(make_shader(cx, cy, rad));
- p.setAntiAlias(true);
- canvas->drawCircle(cx, cy, rad, p);
- // now setup a saveLayer that will pull in the backdrop and blur it
- //
- const SkRect r = {cx-50, cy-50, cx+50, cy+50};
- const SkRect* drawrptr = useHintRect ? &r : nullptr;
- const SkScalar sigma = 10;
- if (useClip) {
- canvas->clipRect(r);
- }
- auto blur = SkBlurImageFilter::Make(sigma, sigma, nullptr);
- auto rec = SkCanvas::SaveLayerRec(drawrptr, nullptr, blur.get(), 0);
- canvas->saveLayer(rec);
- // draw something inside, just to demonstrate that we don't blur the new contents,
- // just the backdrop.
- p.setColor(SK_ColorYELLOW);
- p.setShader(nullptr);
- canvas->drawCircle(cx, cy, 30, p);
- canvas->restore();
- }
- /*
- * Draws a 2x4 grid of sweep circles.
- * - for a given row, each col should be identical (canvas, picture)
- * - row:0 no-hint-rect no-clip-rect expect big blur (except inner circle)
- * - row:1 no-hint-rect clip-rect expect small blur (except inner circle)
- * - row:2 hint-rect no-clip-rect expect big blur (except inner circle)
- * - row:3 hint-rect clip-rect expect small blur (except inner circle)
- *
- * The test is that backdrop effects should be independent of the hint-rect, but should
- * respect the clip-rect.
- */
- DEF_SIMPLE_GM(backdrop_hintrect_clipping, canvas, 512, 1024) {
- for (bool useHintRect : {false, true}) {
- for (bool useClip : {false, true}) {
- canvas->save();
- do_draw(canvas, useClip, useHintRect);
- SkPictureRecorder rec;
- do_draw(rec.beginRecording(256, 256), useClip, useHintRect);
- canvas->translate(256, 0);
- canvas->drawPicture(rec.finishRecordingAsPicture());
- canvas->restore();
- canvas->translate(0, 256);
- }
- }
- }
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