You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
3.5 KiB
97 lines
3.5 KiB
/*
|
|
* 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/SkGradientShader.h"
|
|
#include "include/effects/SkImageFilters.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);
|
|
}
|
|
// Using kClamp because kDecal, the default, produces transparency near the edge of the canvas's
|
|
// device.
|
|
auto blur = SkImageFilters::Blur(sigma, sigma, SkTileMode::kClamp, 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);
|
|
}
|
|
}
|
|
}
|