115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
/*
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* Copyright 2013 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.h"
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#include "SkBlurMask.h"
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#include "SkMaskFilter.h"
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#include "SkPath.h"
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namespace skiagm {
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// This GM exercises the blurred rect nine-patching special cases when the
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// blurred rect is very large and/or very far from the origin.
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// It creates a large blurred rect/rectori then renders the 4 corners and the
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// middle.
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class BigBlursGM : public GM {
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public:
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BigBlursGM() {
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this->setBGColor(0xFFDDDDDD);
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}
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protected:
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SkString onShortName() override {
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return SkString("bigblurs");
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}
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SkISize onISize() override {
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return SkISize::Make(kWidth, kHeight);
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}
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void onDraw(SkCanvas* canvas) override {
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constexpr int kBig = 65536;
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const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(4));
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const SkRect bigRect = SkRect::MakeWH(SkIntToScalar(kBig), SkIntToScalar(kBig));
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SkRect insetRect = bigRect;
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insetRect.inset(20, 20);
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SkPath rectori;
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rectori.addRect(bigRect);
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rectori.addRect(insetRect, SkPath::kCCW_Direction);
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// The blur extends 3*kSigma out from the big rect.
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// Offset the close-up windows so we get the entire blur
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const SkScalar kLeftTopPad = 3*kSigma; // use on left & up of big rect
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const SkScalar kRightBotPad = kCloseUpSize-3*kSigma; // use on right and bot sides
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// UL hand corners of the rendered closeups
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const SkPoint origins[] = {
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{ -kLeftTopPad, -kLeftTopPad }, // UL
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{ kBig-kRightBotPad, -kLeftTopPad }, // UR
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{ kBig-kRightBotPad, kBig-kRightBotPad }, // LR
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{ -kLeftTopPad, kBig-kRightBotPad }, // LL
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{ kBig/2-kCloseUpSize/2, kBig/2-kCloseUpSize/2 }, // center
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};
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SkPaint outlinePaint;
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outlinePaint.setColor(SK_ColorRED);
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outlinePaint.setStyle(SkPaint::kStroke_Style);
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SkPaint blurPaint;
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blurPaint.setAntiAlias(true);
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blurPaint.setColor(SK_ColorBLACK);
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int desiredX = 0, desiredY = 0;
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for (int i = 0; i < 2; ++i) {
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for (int j = 0; j <= kLastEnum_SkBlurStyle; ++j) {
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blurPaint.setMaskFilter(SkMaskFilter::MakeBlur((SkBlurStyle)j, kSigma));
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for (int k = 0; k < (int)SK_ARRAY_COUNT(origins); ++k) {
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canvas->save();
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SkRect clipRect = SkRect::MakeXYWH(SkIntToScalar(desiredX),
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SkIntToScalar(desiredY),
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SkIntToScalar(kCloseUpSize),
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SkIntToScalar(kCloseUpSize));
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canvas->clipRect(clipRect);
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canvas->translate(desiredX-origins[k].fX,
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desiredY-origins[k].fY);
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if (0 == i) {
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canvas->drawRect(bigRect, blurPaint);
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} else {
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canvas->drawPath(rectori, blurPaint);
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}
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canvas->restore();
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canvas->drawRect(clipRect, outlinePaint);
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desiredX += kCloseUpSize;
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}
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desiredX = 0;
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desiredY += kCloseUpSize;
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}
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}
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}
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private:
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static constexpr int kCloseUpSize = 64;
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static constexpr int kWidth = 5 * kCloseUpSize;
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static constexpr int kHeight = 2 * (kLastEnum_SkBlurStyle + 1) * kCloseUpSize;
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typedef GM INHERITED;
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};
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DEF_GM(return new BigBlursGM;)
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}
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