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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkBlurMaskFilter.h"
#include "SkRRect.h"
#include "sk_tool_utils.h"
static SkRect offset_center_to(const SkIRect& src, SkScalar x, SkScalar y) {
SkScalar halfW = 0.5f * src.width();
SkScalar halfH = 0.5f * src.height();
return SkRect::MakeLTRB(x - halfW, y - halfH, x + halfW, y + halfH);
}
static void draw_rrect(SkCanvas* canvas, const SkRRect& rr, const SkRRect& occRR) {
const SkScalar kBlurSigma = 5.0f;
SkRect occRect;
SkColor strokeColor;
{
SkRect occRect1 = sk_tool_utils::compute_central_occluder(occRR);
SkRect occRect2 = sk_tool_utils::compute_widest_occluder(occRR);
SkRect occRect3 = sk_tool_utils::compute_tallest_occluder(occRR);
SkScalar area1 = occRect1.width() * occRect1.height();
SkScalar area2 = occRect2.width() * occRect2.height();
SkScalar area3 = occRect3.width() * occRect3.height();
if (area1 >= area2 && area1 >= area3) {
strokeColor = SK_ColorRED;
occRect = occRect1;
} else if (area2 > area3) {
strokeColor = SK_ColorYELLOW;
occRect = occRect2;
} else {
strokeColor = SK_ColorCYAN;
occRect = occRect3;
}
}
// draw the blur
SkPaint paint;
paint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, kBlurSigma, occRect));
canvas->drawRRect(rr, paint);
// draw the stroked geometry of the full occluder
SkPaint stroke;
stroke.setStyle(SkPaint::kStroke_Style);
stroke.setColor(SK_ColorBLUE);
canvas->drawRRect(occRR, stroke);
// draw the geometry of the occluding rect
stroke.setColor(strokeColor);
canvas->drawRect(occRect, stroke);
}
static void draw_45(SkCanvas* canvas, SkRRect::Corner corner,
SkScalar dist, const SkPoint& center) {
SkRRect::Corner left = SkRRect::kUpperLeft_Corner, right = SkRRect::kUpperLeft_Corner;
SkVector dir = { 0, 0 };
constexpr SkScalar kSize = 64.0f / SK_ScalarSqrt2;
switch (corner) {
case SkRRect::kUpperLeft_Corner:
left = SkRRect::kUpperRight_Corner;
right = SkRRect::kLowerLeft_Corner;
dir.set(-SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2);
break;
case SkRRect::kUpperRight_Corner:
left = SkRRect::kUpperLeft_Corner;
right = SkRRect::kLowerRight_Corner;
dir.set(SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2);
break;
case SkRRect::kLowerRight_Corner:
left = SkRRect::kLowerLeft_Corner;
right = SkRRect::kUpperRight_Corner;
dir.set(SK_ScalarRoot2Over2, SK_ScalarRoot2Over2);
break;
case SkRRect::kLowerLeft_Corner:
left = SkRRect::kLowerRight_Corner;
right = SkRRect::kUpperLeft_Corner;
dir.set(-SK_ScalarRoot2Over2, SK_ScalarRoot2Over2);
break;
default:
SkFAIL("Invalid shape.");
}
SkRect r = SkRect::MakeWH(kSize, kSize);
// UL, UR, LR, LL
SkVector radii[4] = { { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f } };
radii[left] = SkVector::Make(kSize, kSize);
radii[right] = SkVector::Make(kSize, kSize);
SkRRect rr;
rr.setRectRadii(
offset_center_to(r.roundOut(), center.fX + dist*dir.fX, center.fY + dist*dir.fY),
radii);
SkRRect occRR;
dist -= 10.0f;
occRR.setRectRadii(
offset_center_to(r.roundOut(), center.fX + dist*dir.fX, center.fY + dist*dir.fY),
radii);
draw_rrect(canvas, rr, occRR);
}
static void draw_45_simple(SkCanvas* canvas, const SkVector& v,
SkScalar dist, const SkPoint& center) {
SkIRect r = SkIRect::MakeWH(64, 64);
SkRRect rr = SkRRect::MakeRectXY(
offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
8, 8);
dist -= 10.0f;
SkRRect occRR = SkRRect::MakeRectXY(
offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
8, 8);
draw_rrect(canvas, rr, occRR);
}
static void draw_90(SkCanvas* canvas, const SkVector& v, SkScalar dist, const SkPoint& center) {
constexpr int kWidth = 25;
SkIRect r;
if (fabs(v.fX) < fabs(v.fY)) {
r = SkIRect::MakeWH(kWidth, 64);
} else {
r = SkIRect::MakeWH(64, kWidth);
}
SkRRect rr = SkRRect::MakeOval(
offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY));
dist -= 10.0f;
SkRRect occRR = SkRRect::MakeOval(
offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY));
draw_rrect(canvas, rr, occRR);
}
static void draw_90_simple(SkCanvas* canvas, const SkVector& v,
SkScalar dist, const SkPoint& center) {
constexpr int kLength = 128;
// The width needs to be larger than 2*3*blurRadii+2*cornerRadius for the analytic
// RRect blur to kick in
constexpr int kWidth = 47;
SkIRect r;
if (fabs(v.fX) < fabs(v.fY)) {
r = SkIRect::MakeWH(kLength, kWidth);
} else {
r = SkIRect::MakeWH(kWidth, kLength);
}
SkRRect rr = SkRRect::MakeRectXY(
offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
8, 8);
dist -= 10.0f;
SkRRect occRR = SkRRect::MakeRectXY(
offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
8, 8);
draw_rrect(canvas, rr, occRR);
}
static void draw_30_60(SkCanvas* canvas, SkRRect::Corner corner, const SkVector& v,
SkScalar dist, const SkPoint& center) {
SkRRect::Corner left = SkRRect::kUpperLeft_Corner, right = SkRRect::kUpperLeft_Corner;
constexpr int kLength = 64;
constexpr int kWidth = 30;
switch (corner) {
case SkRRect::kUpperLeft_Corner:
left = SkRRect::kUpperRight_Corner;
right = SkRRect::kLowerLeft_Corner;
break;
case SkRRect::kUpperRight_Corner:
left = SkRRect::kUpperLeft_Corner;
right = SkRRect::kLowerRight_Corner;
break;
case SkRRect::kLowerRight_Corner:
left = SkRRect::kLowerLeft_Corner;
right = SkRRect::kUpperRight_Corner;
break;
case SkRRect::kLowerLeft_Corner:
left = SkRRect::kLowerRight_Corner;
right = SkRRect::kUpperLeft_Corner;
break;
default:
SkFAIL("Invalid shape.");
}
SkIRect r;
if (fabs(v.fX) < fabs(v.fY)) {
r = SkIRect::MakeWH(kLength, kWidth);
} else {
r = SkIRect::MakeWH(kWidth, kLength);
}
// UL, UR, LR, LL
SkVector radii[4] = { { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f } };
radii[left] = SkVector::Make(SkIntToScalar(kWidth), SkIntToScalar(kWidth));
radii[right] = SkVector::Make(SkIntToScalar(kWidth), SkIntToScalar(kWidth));
SkRRect rr;
rr.setRectRadii(offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY), radii);
dist -= 10.0f;
SkRRect occRR;
occRR.setRectRadii(offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY), radii);
draw_rrect(canvas, rr, occRR);
}
namespace skiagm {
class OccludedRRectBlurGM : public GM {
public:
OccludedRRectBlurGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
}
protected:
SkString onShortName() override {
return SkString("occludedrrectblur");
}
SkISize onISize() override {
return SkISize::Make(kWidth, kHeight);
}
void onDraw(SkCanvas* canvas) override {
const SkPoint center = SkPoint::Make(kWidth/2, kHeight/2);
// outer-most big RR
{
SkIRect r = SkIRect::MakeWH(420, 420);
SkRRect rr = SkRRect::MakeRectXY(offset_center_to(r, center.fX, center.fY), 64, 64);
draw_rrect(canvas, rr, rr);
#if 1
// TODO: remove this. Until we actually start skipping the middle draw we need this
// to provide contrast
SkPaint temp;
temp.setColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
r.inset(32, 32);
canvas->drawRect(offset_center_to(r, center.fX, center.fY), temp);
#endif
}
// center circle
{
SkIRect r = SkIRect::MakeWH(32, 32);
SkRRect rr = SkRRect::MakeOval(offset_center_to(r, center.fX, center.fY));
draw_rrect(canvas, rr, rr);
}
draw_45(canvas, SkRRect::kUpperLeft_Corner, 64, center);
draw_45(canvas, SkRRect::kUpperRight_Corner, 64, center);
draw_45(canvas, SkRRect::kLowerRight_Corner, 64, center);
draw_45(canvas, SkRRect::kLowerLeft_Corner, 64, center);
draw_90(canvas, SkVector::Make(-1.0f, 0.0f), 64, center);
draw_90(canvas, SkVector::Make(0.0f, -1.0f), 64, center);
draw_90(canvas, SkVector::Make(1.0f, 0.0f), 64, center);
draw_90(canvas, SkVector::Make(0.0f, 1.0f), 64, center);
constexpr SkScalar kRoot3Over2 = 0.8660254037844386f;
draw_30_60(canvas, SkRRect::kLowerLeft_Corner,
SkVector::Make(0.5f, kRoot3Over2), 120, center);
draw_30_60(canvas, SkRRect::kUpperRight_Corner,
SkVector::Make(kRoot3Over2, 0.5f), 120, center);
draw_30_60(canvas, SkRRect::kUpperLeft_Corner,
SkVector::Make(-0.5f, kRoot3Over2), 120, center);
draw_30_60(canvas, SkRRect::kLowerRight_Corner,
SkVector::Make(-kRoot3Over2, 0.5f), 120, center);
draw_30_60(canvas, SkRRect::kLowerLeft_Corner,
SkVector::Make(-0.5f, -kRoot3Over2), 120, center);
draw_30_60(canvas, SkRRect::kUpperRight_Corner,
SkVector::Make(-kRoot3Over2, -0.5f), 120, center);
draw_30_60(canvas, SkRRect::kUpperLeft_Corner,
SkVector::Make(0.5f, -kRoot3Over2), 120, center);
draw_30_60(canvas, SkRRect::kLowerRight_Corner,
SkVector::Make(kRoot3Over2, -0.5f), 120, center);
draw_45_simple(canvas, SkVector::Make(-SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2),
210, center);
draw_45_simple(canvas, SkVector::Make(SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2),
210, center);
draw_45_simple(canvas, SkVector::Make(SK_ScalarRoot2Over2, SK_ScalarRoot2Over2),
210, center);
draw_45_simple(canvas, SkVector::Make(-SK_ScalarRoot2Over2, SK_ScalarRoot2Over2),
210, center);
draw_90_simple(canvas, SkVector::Make(-1.0f, 0.0f), 160, center);
draw_90_simple(canvas, SkVector::Make(0.0f, -1.0f), 160, center);
draw_90_simple(canvas, SkVector::Make(1.0f, 0.0f), 160, center);
draw_90_simple(canvas, SkVector::Make(0.0f, 1.0f), 160, center);
}
private:
static constexpr int kWidth = 440;
static constexpr int kHeight = 440;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new OccludedRRectBlurGM;)
}
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