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skia2/gm/smallpaths.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 2015 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 "SkPath.h"
typedef SkScalar (*MakePathProc)(SkPath*);
static SkScalar make_triangle(SkPath* path) {
constexpr int gCoord[] = {
10, 20, 15, 5, 30, 30
};
path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
path->close();
path->offset(SkIntToScalar(10), SkIntToScalar(0));
return SkIntToScalar(30);
}
static SkScalar make_rect(SkPath* path) {
SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
SkIntToScalar(30), SkIntToScalar(30) };
path->addRect(r);
path->offset(SkIntToScalar(10), SkIntToScalar(0));
return SkIntToScalar(30);
}
static SkScalar make_oval(SkPath* path) {
SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
SkIntToScalar(30), SkIntToScalar(30) };
path->addOval(r);
path->offset(SkIntToScalar(10), SkIntToScalar(0));
return SkIntToScalar(30);
}
static SkScalar make_star(SkPath* path, int n) {
const SkScalar c = SkIntToScalar(45);
const SkScalar r = SkIntToScalar(20);
SkScalar rad = -SK_ScalarPI / 2;
const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
path->moveTo(c, c - r);
for (int i = 1; i < n; i++) {
rad += drad;
SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
path->lineTo(c + SkScalarMul(cosV, r), c + SkScalarMul(sinV, r));
}
path->close();
return r * 2 * 6 / 5;
}
static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }
static SkScalar make_three_line(SkPath* path) {
static SkScalar xOffset = 34.f;
static SkScalar yOffset = 50.f;
path->moveTo(-32.5f + xOffset, 0.0f + yOffset);
path->lineTo(32.5f + xOffset, 0.0f + yOffset);
path->moveTo(-32.5f + xOffset, 19 + yOffset);
path->lineTo(32.5f + xOffset, 19 + yOffset);
path->moveTo(-32.5f + xOffset, -19 + yOffset);
path->lineTo(32.5f + xOffset, -19 + yOffset);
path->lineTo(-32.5f + xOffset, -19 + yOffset);
path->close();
return SkIntToScalar(70);
}
static SkScalar make_arrow(SkPath* path) {
static SkScalar xOffset = 34.f;
static SkScalar yOffset = 40.f;
path->moveTo(-26.f + xOffset, 0.0f + yOffset);
path->lineTo(26.f + xOffset, 0.0f + yOffset);
path->moveTo(-28.f + xOffset, -2.4748745f + yOffset);
path->lineTo(0 + xOffset, 25.525126f + yOffset);
path->moveTo(-28.f + xOffset, 2.4748745f + yOffset);
path->lineTo(0 + xOffset, -25.525126f + yOffset);
path->lineTo(-28.f + xOffset, 2.4748745f + yOffset);
path->close();
return SkIntToScalar(70);
}
static SkScalar make_curve(SkPath* path) {
static SkScalar xOffset = -382.f;
static SkScalar yOffset = -50.f;
path->moveTo(491 + xOffset, 56 + yOffset);
path->conicTo(435.93292f + xOffset, 56.000031f + yOffset,
382.61078f + xOffset, 69.752716f + yOffset,
0.9920463f);
return SkIntToScalar(40);
}
static SkScalar make_battery(SkPath* path) {
static SkScalar xOffset = 5.f;
path->moveTo(24.67f + xOffset, 0.33000004f);
path->lineTo(8.3299999f + xOffset, 0.33000004f);
path->lineTo(8.3299999f + xOffset, 5.3299999f);
path->lineTo(0.33000004f + xOffset, 5.3299999f);
path->lineTo(0.33000004f + xOffset, 50.669998f);
path->lineTo(32.669998f + xOffset, 50.669998f);
path->lineTo(32.669998f + xOffset, 5.3299999f);
path->lineTo(24.67f + xOffset, 5.3299999f);
path->lineTo(24.67f + xOffset, 0.33000004f);
path->close();
path->moveTo(25.727224f + xOffset, 12.886665f);
path->lineTo(10.907918f + xOffset, 12.886665f);
path->lineTo(7.5166659f + xOffset, 28.683645f);
path->lineTo(14.810181f + xOffset, 28.683645f);
path->lineTo(7.7024879f + xOffset, 46.135998f);
path->lineTo(28.049999f + xOffset, 25.136419f);
path->lineTo(16.854223f + xOffset, 25.136419f);
path->lineTo(25.727224f + xOffset, 12.886665f);
path->close();
return SkIntToScalar(50);
}
static SkScalar make_battery2(SkPath* path) {
static SkScalar xOffset = 5.f;
path->moveTo(32.669998f + xOffset, 9.8640003f);
path->lineTo(0.33000004f + xOffset, 9.8640003f);
path->lineTo(0.33000004f + xOffset, 50.669998f);
path->lineTo(32.669998f + xOffset, 50.669998f);
path->lineTo(32.669998f + xOffset, 9.8640003f);
path->close();
path->moveTo(10.907918f + xOffset, 12.886665f);
path->lineTo(25.727224f + xOffset, 12.886665f);
path->lineTo(16.854223f + xOffset, 25.136419f);
path->lineTo(28.049999f + xOffset, 25.136419f);
path->lineTo(7.7024879f + xOffset, 46.135998f);
path->lineTo(14.810181f + xOffset, 28.683645f);
path->lineTo(7.5166659f + xOffset, 28.683645f);
path->lineTo(10.907918f + xOffset, 12.886665f);
path->close();
return SkIntToScalar(70);
}
constexpr MakePathProc gProcs[] = {
make_triangle,
make_rect,
make_oval,
make_star_5,
make_star_13,
make_three_line,
make_arrow,
make_curve,
make_battery,
make_battery2
};
constexpr SkScalar gWidths[] = {
2.0f,
3.0f,
4.0f,
5.0f,
6.0f,
7.0f,
7.0f,
14.0f,
0.0f,
0.0f,
};
constexpr SkScalar gMiters[] = {
2.0f,
3.0f,
3.0f,
3.0f,
4.0f,
4.0f,
4.0f,
4.0f,
4.0f,
4.0f,
};
#define N SK_ARRAY_COUNT(gProcs)
// This GM tests out drawing small paths (i.e., for Ganesh, using the Distance
// Field path renderer) which are filled, stroked and filledAndStroked. In
// particular this ensures that any cache keys in use include the stroking
// parameters.
class SmallPathsGM : public skiagm::GM {
SkPath fPath[N];
SkScalar fDY[N];
protected:
void onOnceBeforeDraw() override {
for (size_t i = 0; i < N; i++) {
fDY[i] = gProcs[i](&fPath[i]);
}
}
SkString onShortName() override {
return SkString("smallpaths");
}
SkISize onISize() override {
return SkISize::Make(640, 480);
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
// first column: filled paths
canvas->save();
for (size_t i = 0; i < N; i++) {
canvas->drawPath(fPath[i], paint);
canvas->translate(SkIntToScalar(0), fDY[i]);
}
canvas->restore();
canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
// second column: stroked paths
canvas->save();
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeCap(SkPaint::kButt_Cap);
for (size_t i = 0; i < N; i++) {
paint.setStrokeWidth(gWidths[i]);
paint.setStrokeMiter(gMiters[i]);
canvas->drawPath(fPath[i], paint);
canvas->translate(SkIntToScalar(0), fDY[i]);
}
canvas->restore();
canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
// third column: stroked paths with different widths
canvas->save();
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeCap(SkPaint::kButt_Cap);
for (size_t i = 0; i < N; i++) {
paint.setStrokeWidth(gWidths[i] + 2.0f);
paint.setStrokeMiter(gMiters[i]);
canvas->drawPath(fPath[i], paint);
canvas->translate(SkIntToScalar(0), fDY[i]);
}
canvas->restore();
canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
// fourth column: stroked and filled paths
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setStrokeCap(SkPaint::kButt_Cap);
for (size_t i = 0; i < N; i++) {
paint.setStrokeWidth(gWidths[i]);
paint.setStrokeMiter(gMiters[i]);
canvas->drawPath(fPath[i], paint);
canvas->translate(SkIntToScalar(0), fDY[i]);
}
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM(return new SmallPathsGM;)
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