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