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skia2/gm/convexpolyclip.cpp
mtklein dbfd7ab108 Replace a lot of 'static const' with 'constexpr' or 'const'. 
'static const' means, there must be at most one of these, and initialize it at
compile time if possible or runtime if necessary.  This leads to unexpected
code execution, and TSAN* will complain about races on the guard variables.

Generally 'constexpr' or 'const' are better choices.  Neither can cause races:
they're either intialized at compile time (constexpr) or intialized each time
independently (const).

This CL prefers constexpr where possible, and uses const where not.  It even
prefers constexpr over const where they don't make a difference... I want to have
lots of examples of constexpr for people to see and mimic.

The scoped-to-class static has nothing to do with any of this, and is not changed.

* Not yet on the bots, which use an older TSAN.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300623005

Review-Url: https://codereview.chromium.org/2300623005
2016-09-01 11:24:54 -07:00

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/*
* Copyright 2014 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 "SkBitmap.h"
#include "SkGradientShader.h"
#include "SkPath.h"
#include "SkTLList.h"
static SkBitmap make_bmp(int w, int h) {
SkBitmap bmp;
bmp.allocN32Pixels(w, h, true);
SkCanvas canvas(bmp);
SkScalar wScalar = SkIntToScalar(w);
SkScalar hScalar = SkIntToScalar(h);
SkPoint pt = { wScalar / 2, hScalar / 2 };
SkScalar radius = 3 * SkMaxScalar(wScalar, hScalar);
SkColor colors[] = { sk_tool_utils::color_to_565(SK_ColorDKGRAY),
sk_tool_utils::color_to_565(0xFF222255),
sk_tool_utils::color_to_565(0xFF331133),
sk_tool_utils::color_to_565(0xFF884422),
sk_tool_utils::color_to_565(0xFF000022), SK_ColorWHITE,
sk_tool_utils::color_to_565(0xFFAABBCC) };
SkScalar pos[] = {0,
SK_Scalar1 / 6,
2 * SK_Scalar1 / 6,
3 * SK_Scalar1 / 6,
4 * SK_Scalar1 / 6,
5 * SK_Scalar1 / 6,
SK_Scalar1};
SkPaint paint;
SkRect rect = SkRect::MakeWH(wScalar, hScalar);
SkMatrix mat = SkMatrix::I();
for (int i = 0; i < 4; ++i) {
paint.setShader(SkGradientShader::MakeRadial(
pt, radius,
colors, pos,
SK_ARRAY_COUNT(colors),
SkShader::kRepeat_TileMode,
0, &mat));
canvas.drawRect(rect, paint);
rect.inset(wScalar / 8, hScalar / 8);
mat.preTranslate(6 * wScalar, 6 * hScalar);
mat.postScale(SK_Scalar1 / 3, SK_Scalar1 / 3);
}
paint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&paint);
paint.setTextSize(wScalar / 2.2f);
paint.setShader(0);
paint.setColor(sk_tool_utils::color_to_565(SK_ColorLTGRAY));
constexpr char kTxt[] = "Skia";
SkPoint texPos = { wScalar / 17, hScalar / 2 + paint.getTextSize() / 2.5f };
canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
paint.setColor(SK_ColorBLACK);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SK_Scalar1);
canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
return bmp;
}
namespace skiagm {
/**
* This GM tests convex polygon clips.
*/
class ConvexPolyClip : public GM {
public:
ConvexPolyClip() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString("convex_poly_clip");
}
SkISize onISize() override {
// When benchmarking the saveLayer set of draws is skipped.
int w = 435;
if (kBench_Mode != this->getMode()) {
w *= 2;
}
return SkISize::Make(w, 540);
}
void onOnceBeforeDraw() override {
SkPath tri;
tri.moveTo(5.f, 5.f);
tri.lineTo(100.f, 20.f);
tri.lineTo(15.f, 100.f);
fClips.addToTail()->setPath(tri);
SkPath hexagon;
constexpr SkScalar kRadius = 45.f;
const SkPoint center = { kRadius, kRadius };
for (int i = 0; i < 6; ++i) {
SkScalar angle = 2 * SK_ScalarPI * i / 6;
SkPoint point;
point.fY = SkScalarSinCos(angle, &point.fX);
point.scale(kRadius);
point = center + point;
if (0 == i) {
hexagon.moveTo(point);
} else {
hexagon.lineTo(point);
}
}
fClips.addToTail()->setPath(hexagon);
SkMatrix scaleM;
scaleM.setScale(1.1f, 0.4f, kRadius, kRadius);
hexagon.transform(scaleM);
fClips.addToTail()->setPath(hexagon);
fClips.addToTail()->setRect(SkRect::MakeXYWH(8.3f, 11.6f, 78.2f, 72.6f));
SkPath rotRect;
SkRect rect = SkRect::MakeLTRB(10.f, 12.f, 80.f, 86.f);
rotRect.addRect(rect);
SkMatrix rotM;
rotM.setRotate(23.f, rect.centerX(), rect.centerY());
rotRect.transform(rotM);
fClips.addToTail()->setPath(rotRect);
fBmp = make_bmp(100, 100);
}
void onDraw(SkCanvas* canvas) override {
SkScalar y = 0;
constexpr SkScalar kMargin = 10.f;
SkPaint bgPaint;
bgPaint.setAlpha(0x15);
SkISize size = canvas->getDeviceSize();
canvas->drawBitmapRect(fBmp, SkRect::MakeIWH(size.fWidth, size.fHeight), &bgPaint);
constexpr char kTxt[] = "Clip Me!";
SkPaint txtPaint;
txtPaint.setTextSize(23.f);
txtPaint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&txtPaint);
txtPaint.setColor(sk_tool_utils::color_to_565(SK_ColorDKGRAY));
SkScalar textW = txtPaint.measureText(kTxt, SK_ARRAY_COUNT(kTxt)-1);
SkScalar startX = 0;
int testLayers = kBench_Mode != this->getMode();
for (int doLayer = 0; doLayer <= testLayers; ++doLayer) {
for (ClipList::Iter iter(fClips, ClipList::Iter::kHead_IterStart);
iter.get();
iter.next()) {
const Clip* clip = iter.get();
SkScalar x = startX;
for (int aa = 0; aa < 2; ++aa) {
if (doLayer) {
SkRect bounds;
clip->getBounds(&bounds);
bounds.outset(2, 2);
bounds.offset(x, y);
canvas->saveLayer(&bounds, nullptr);
} else {
canvas->save();
}
canvas->translate(x, y);
clip->setOnCanvas(canvas, SkRegion::kIntersect_Op, SkToBool(aa));
canvas->drawBitmap(fBmp, 0, 0);
canvas->restore();
x += fBmp.width() + kMargin;
}
for (int aa = 0; aa < 2; ++aa) {
SkPaint clipOutlinePaint;
clipOutlinePaint.setAntiAlias(true);
clipOutlinePaint.setColor(0x50505050);
clipOutlinePaint.setStyle(SkPaint::kStroke_Style);
clipOutlinePaint.setStrokeWidth(0);
if (doLayer) {
SkRect bounds;
clip->getBounds(&bounds);
bounds.outset(2, 2);
bounds.offset(x, y);
canvas->saveLayer(&bounds, nullptr);
} else {
canvas->save();
}
canvas->translate(x, y);
SkPath closedClipPath;
clip->asClosedPath(&closedClipPath);
canvas->drawPath(closedClipPath, clipOutlinePaint);
clip->setOnCanvas(canvas, SkRegion::kIntersect_Op, SkToBool(aa));
canvas->scale(1.f, 1.8f);
canvas->drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1,
0, 1.5f * txtPaint.getTextSize(),
txtPaint);
canvas->restore();
x += textW + 2 * kMargin;
}
y += fBmp.height() + kMargin;
}
y = 0;
startX += 2 * fBmp.width() + SkScalarCeilToInt(2 * textW) + 6 * kMargin;
}
}
bool runAsBench() const override { return true; }
private:
class Clip {
public:
enum ClipType {
kNone_ClipType,
kPath_ClipType,
kRect_ClipType
};
Clip () : fClipType(kNone_ClipType) {}
void setOnCanvas(SkCanvas* canvas, SkRegion::Op op, bool aa) const {
switch (fClipType) {
case kPath_ClipType:
canvas->clipPath(fPath, op, aa);
break;
case kRect_ClipType:
canvas->clipRect(fRect, op, aa);
break;
case kNone_ClipType:
SkDEBUGFAIL("Uninitialized Clip.");
break;
}
}
void asClosedPath(SkPath* path) const {
switch (fClipType) {
case kPath_ClipType:
*path = fPath;
path->close();
break;
case kRect_ClipType:
path->reset();
path->addRect(fRect);
break;
case kNone_ClipType:
SkDEBUGFAIL("Uninitialized Clip.");
break;
}
}
void setPath(const SkPath& path) {
fClipType = kPath_ClipType;
fPath = path;
}
void setRect(const SkRect& rect) {
fClipType = kRect_ClipType;
fRect = rect;
fPath.reset();
}
ClipType getType() const { return fClipType; }
void getBounds(SkRect* bounds) const {
switch (fClipType) {
case kPath_ClipType:
*bounds = fPath.getBounds();
break;
case kRect_ClipType:
*bounds = fRect;
break;
case kNone_ClipType:
SkDEBUGFAIL("Uninitialized Clip.");
break;
}
}
private:
ClipType fClipType;
SkPath fPath;
SkRect fRect;
};
typedef SkTLList<Clip, 1> ClipList;
ClipList fClips;
SkBitmap fBmp;
typedef GM INHERITED;
};
DEF_GM(return new ConvexPolyClip;)
}
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