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skia2/gm/polygonoffset.cpp
John Stiles acf7164587 Fix cases of variable shadowing in /gm/. 
If we manage to fix all the existing cases of variable shadowing, we
could enable -Wshadow.

Change-Id: I905459bf0bbaa205da7dc59e1910e345bed2af51
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/438538
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2021-08-13 03:35:15 +00:00

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/*
* Copyright 2018 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/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
#include "include/private/SkTDArray.h"
#include "src/utils/SkPolyUtils.h"
#include "tools/ToolUtils.h"
#include <functional>
#include <memory>
static void create_ngon(int n, SkPoint* pts, SkScalar w, SkScalar h, SkPathDirection dir) {
float angleStep = 360.0f / n, angle = 0.0f;
if ((n % 2) == 1) {
angle = angleStep/2.0f;
}
if (SkPathDirection::kCCW == dir) {
angle = -angle;
angleStep = -angleStep;
}
for (int i = 0; i < n; ++i) {
pts[i].fX = -SkScalarSin(SkDegreesToRadians(angle)) * w;
pts[i].fY = SkScalarCos(SkDegreesToRadians(angle)) * h;
angle += angleStep;
}
}
namespace PolygonOffsetData {
// narrow rect
const SkPoint gPoints0[] = {
{ -1.5f, -50.0f },
{ 1.5f, -50.0f },
{ 1.5f, 50.0f },
{ -1.5f, 50.0f }
};
// narrow rect on an angle
const SkPoint gPoints1[] = {
{ -50.0f, -49.0f },
{ -49.0f, -50.0f },
{ 50.0f, 49.0f },
{ 49.0f, 50.0f }
};
// trap - narrow on top - wide on bottom
const SkPoint gPoints2[] = {
{ -10.0f, -50.0f },
{ 10.0f, -50.0f },
{ 50.0f, 50.0f },
{ -50.0f, 50.0f }
};
// wide skewed rect
const SkPoint gPoints3[] = {
{ -50.0f, -50.0f },
{ 0.0f, -50.0f },
{ 50.0f, 50.0f },
{ 0.0f, 50.0f }
};
// thin rect with colinear-ish lines
const SkPoint gPoints4[] = {
{ -6.0f, -50.0f },
{ 4.0f, -50.0f },
{ 5.0f, -25.0f },
{ 6.0f, 0.0f },
{ 5.0f, 25.0f },
{ 4.0f, 50.0f },
{ -4.0f, 50.0f }
};
// degenerate
const SkPoint gPoints5[] = {
{ -0.025f, -0.025f },
{ 0.025f, -0.025f },
{ 0.025f, 0.025f },
{ -0.025f, 0.025f }
};
// Quad with near coincident point
const SkPoint gPoints6[] = {
{ -20.0f, -13.0f },
{ -20.0f, -13.05f },
{ 20.0f, -13.0f },
{ 20.0f, 27.0f }
};
// thin rect with colinear lines
const SkPoint gPoints7[] = {
{ -10.0f, -50.0f },
{ 10.0f, -50.0f },
{ 10.0f, -20.0f },
{ 10.0f, 0.0f },
{ 10.0f, 35.0f },
{ 10.0f, 50.0f },
{ -10.0f, 50.0f }
};
// capped teardrop
const SkPoint gPoints8[] = {
{ 50.00f, 50.00f },
{ 0.00f, 50.00f },
{ -15.45f, 47.55f },
{ -29.39f, 40.45f },
{ -40.45f, 29.39f },
{ -47.55f, 15.45f },
{ -50.00f, 0.00f },
{ -47.55f, -15.45f },
{ -40.45f, -29.39f },
{ -29.39f, -40.45f },
{ -15.45f, -47.55f },
{ 0.00f, -50.00f },
{ 50.00f, -50.00f }
};
// teardrop
const SkPoint gPoints9[] = {
{ 4.39f, 40.45f },
{ -9.55f, 47.55f },
{ -25.00f, 50.00f },
{ -40.45f, 47.55f },
{ -54.39f, 40.45f },
{ -65.45f, 29.39f },
{ -72.55f, 15.45f },
{ -75.00f, 0.00f },
{ -72.55f, -15.45f },
{ -65.45f, -29.39f },
{ -54.39f, -40.45f },
{ -40.45f, -47.55f },
{ -25.0f, -50.0f },
{ -9.55f, -47.55f },
{ 4.39f, -40.45f },
{ 75.00f, 0.00f }
};
// clipped triangle
const SkPoint gPoints10[] = {
{ -10.0f, -50.0f },
{ 10.0f, -50.0f },
{ 50.0f, 31.0f },
{ 40.0f, 50.0f },
{ -40.0f, 50.0f },
{ -50.0f, 31.0f },
};
// tab
const SkPoint gPoints11[] = {
{ -45, -25 },
{ 45, -25 },
{ 45, 25 },
{ 20, 25 },
{ 19.6157f, 25.f + 3.9018f },
{ 18.4776f, 25.f + 7.6537f },
{ 16.6294f, 25.f + 11.1114f },
{ 14.1421f, 25.f + 14.1421f },
{ 11.1114f, 25.f + 16.6294f },
{ 7.6537f, 25.f + 18.4776f },
{ 3.9018f, 25.f + 19.6157f },
{ 0, 45.f },
{ -3.9018f, 25.f + 19.6157f },
{ -7.6537f, 25.f + 18.4776f },
{ -11.1114f, 25.f + 16.6294f },
{ -14.1421f, 25.f + 14.1421f },
{ -16.6294f, 25.f + 11.1114f },
{ -18.4776f, 25.f + 7.6537f },
{ -19.6157f, 25.f + 3.9018f },
{ -20, 25 },
{ -45, 25 }
};
// star of david
const SkPoint gPoints12[] = {
{ 0.0f, -50.0f },
{ 14.43f, -25.0f },
{ 43.30f, -25.0f },
{ 28.86f, 0.0f },
{ 43.30f, 25.0f },
{ 14.43f, 25.0f },
{ 0.0f, 50.0f },
{ -14.43f, 25.0f },
{ -43.30f, 25.0f },
{ -28.86f, 0.0f },
{ -43.30f, -25.0f },
{ -14.43f, -25.0f },
};
// notch
const SkScalar kBottom = 25.f;
const SkPoint gPoints13[] = {
{ -50, kBottom - 50.f },
{ 50, kBottom - 50.f },
{ 50, kBottom },
{ 20, kBottom },
{ 19.6157f, kBottom - 3.9018f },
{ 18.4776f, kBottom - 7.6537f },
{ 16.6294f, kBottom - 11.1114f },
{ 14.1421f, kBottom - 14.1421f },
{ 11.1114f, kBottom - 16.6294f },
{ 7.6537f, kBottom - 18.4776f },
{ 3.9018f, kBottom - 19.6157f },
{ 0, kBottom - 20.f },
{ -3.9018f, kBottom - 19.6157f },
{ -7.6537f, kBottom - 18.4776f },
{ -11.1114f, kBottom - 16.6294f },
{ -14.1421f, kBottom - 14.1421f },
{ -16.6294f, kBottom - 11.1114f },
{ -18.4776f, kBottom - 7.6537f },
{ -19.6157f, kBottom - 3.9018f },
{ -20, kBottom },
{ -50, kBottom }
};
// crown
const SkPoint gPoints14[] = {
{ -40, -39 },
{ 40, -39 },
{ 40, -20 },
{ 30, 40 },
{ 20, -20 },
{ 10, 40 },
{ 0, -20 },
{ -10, 40 },
{ -20, -20 },
{ -30, 40 },
{ -40, -20 }
};
// dumbbell
const SkPoint gPoints15[] = {
{ -26, -3 },
{ -24, -6.2f },
{ -22.5f, -8 },
{ -20, -9.9f },
{ -17.5f, -10.3f },
{ -15, -10.9f },
{ -12.5f, -10.2f },
{ -10, -9.7f },
{ -7.5f, -8.1f },
{ -5, -7.7f },
{ -2.5f, -7.4f },
{ 0, -7.7f },
{ 3, -9 },
{ 6.5f, -11.5f },
{ 10.6f, -14 },
{ 14, -15.2f },
{ 17, -15.5f },
{ 20, -15.2f },
{ 23.4f, -14 },
{ 27.5f, -11.5f },
{ 30, -8 },
{ 32, -4 },
{ 32.5f, 0 },
{ 32, 4 },
{ 30, 8 },
{ 27.5f, 11.5f },
{ 23.4f, 14 },
{ 20, 15.2f },
{ 17, 15.5f },
{ 14, 15.2f },
{ 10.6f, 14 },
{ 6.5f, 11.5f },
{ 3, 9 },
{ 0, 7.7f },
{ -2.5f, 7.4f },
{ -5, 7.7f },
{ -7.5f, 8.1f },
{ -10, 9.7f },
{ -12.5f, 10.2f },
{ -15, 10.9f },
{ -17.5f, 10.3f },
{ -20, 9.9f },
{ -22.5f, 8 },
{ -24, 6.2f },
{ -26, 3 },
{ -26.5f, 0 }
};
// truncated dumbbell
// (checks winding computation in OffsetSimplePolygon)
const SkPoint gPoints16[] = {
{ -15 + 3, -9 },
{ -15 + 6.5f, -11.5f },
{ -15 + 10.6f, -14 },
{ -15 + 14, -15.2f },
{ -15 + 17, -15.5f },
{ -15 + 20, -15.2f },
{ -15 + 23.4f, -14 },
{ -15 + 27.5f, -11.5f },
{ -15 + 30, -8 },
{ -15 + 32, -4 },
{ -15 + 32.5f, 0 },
{ -15 + 32, 4 },
{ -15 + 30, 8 },
{ -15 + 27.5f, 11.5f },
{ -15 + 23.4f, 14 },
{ -15 + 20, 15.2f },
{ -15 + 17, 15.5f },
{ -15 + 14, 15.2f },
{ -15 + 10.6f, 14 },
{ -15 + 6.5f, 11.5f },
{ -15 + 3, 9 },
};
// square notch
// (to detect segment-segment intersection)
const SkPoint gPoints17[] = {
{ -50, kBottom - 50.f },
{ 50, kBottom - 50.f },
{ 50, kBottom },
{ 20, kBottom },
{ 20, kBottom - 20.f },
{ -20, kBottom - 20.f },
{ -20, kBottom },
{ -50, kBottom }
};
// box with Peano curve
const SkPoint gPoints18[] = {
{ 0, 0 },
{ 0, -12 },
{ -6, -12 },
{ -6, 0 },
{ -12, 0 },
{ -12, -12},
{ -18, -12},
{ -18, 18},
{ -12, 18},
{-12, 6},
{-6, 6},
{-6, 36},
{-12, 36},
{-12, 24},
{-18, 24},
{-18, 36},
{-24, 36},
{-24, 24},
{-30, 24},
{-30, 36},
{-36, 36},
{-36, 6},
{-30, 6},
{-30, 18},
{-24, 18},
{-24, -12},
{-30, -12},
{-30, 0},
{-36, 0},
{-36, -36},
{36, -36},
{36, 36},
{12, 36},
{12, 24},
{6, 24},
{6, 36},
{0, 36},
{0, 6},
{6, 6},
{6, 18},
{12, 18},
{12, -12},
{6, -12},
{6, 0}
};
const SkPoint* gConvexPoints[] = {
gPoints0, gPoints1, gPoints2, gPoints3, gPoints4, gPoints5, gPoints6,
gPoints7, gPoints8, gPoints9, gPoints10,
};
const size_t gConvexSizes[] = {
SK_ARRAY_COUNT(gPoints0),
SK_ARRAY_COUNT(gPoints1),
SK_ARRAY_COUNT(gPoints2),
SK_ARRAY_COUNT(gPoints3),
SK_ARRAY_COUNT(gPoints4),
SK_ARRAY_COUNT(gPoints5),
SK_ARRAY_COUNT(gPoints6),
SK_ARRAY_COUNT(gPoints7),
SK_ARRAY_COUNT(gPoints8),
SK_ARRAY_COUNT(gPoints9),
SK_ARRAY_COUNT(gPoints10),
};
static_assert(SK_ARRAY_COUNT(gConvexSizes) == SK_ARRAY_COUNT(gConvexPoints), "array_mismatch");
const SkPoint* gSimplePoints[] = {
gPoints0, gPoints1, gPoints2, gPoints4, gPoints5, gPoints7,
gPoints8, gPoints11, gPoints12, gPoints13, gPoints14, gPoints15,
gPoints16, gPoints17, gPoints18,
};
const size_t gSimpleSizes[] = {
SK_ARRAY_COUNT(gPoints0),
SK_ARRAY_COUNT(gPoints1),
SK_ARRAY_COUNT(gPoints2),
SK_ARRAY_COUNT(gPoints4),
SK_ARRAY_COUNT(gPoints5),
SK_ARRAY_COUNT(gPoints7),
SK_ARRAY_COUNT(gPoints8),
SK_ARRAY_COUNT(gPoints11),
SK_ARRAY_COUNT(gPoints12),
SK_ARRAY_COUNT(gPoints13),
SK_ARRAY_COUNT(gPoints14),
SK_ARRAY_COUNT(gPoints15),
SK_ARRAY_COUNT(gPoints16),
SK_ARRAY_COUNT(gPoints17),
SK_ARRAY_COUNT(gPoints18),
};
static_assert(SK_ARRAY_COUNT(gSimpleSizes) == SK_ARRAY_COUNT(gSimplePoints), "array_mismatch");
} // namespace PolygonOffsetData
namespace skiagm {
// This GM is intended to exercise the offsetting of polygons
// When fVariableOffset is true it will skew the offset by x,
// to test perspective and other variable offset functions
class PolygonOffsetGM : public GM {
public:
PolygonOffsetGM(bool convexOnly)
: fConvexOnly(convexOnly) {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
if (fConvexOnly) {
return SkString("convex-polygon-inset");
} else {
return SkString("simple-polygon-offset");
}
}
SkISize onISize() override { return SkISize::Make(kGMWidth, kGMHeight); }
bool runAsBench() const override { return true; }
static void GetConvexPolygon(int index, SkPathDirection dir,
std::unique_ptr<SkPoint[]>* data, int* numPts) {
if (index < (int)SK_ARRAY_COUNT(PolygonOffsetData::gConvexPoints)) {
// manually specified
*numPts = (int)PolygonOffsetData::gConvexSizes[index];
*data = std::make_unique<SkPoint[]>(*numPts);
if (SkPathDirection::kCW == dir) {
for (int i = 0; i < *numPts; ++i) {
(*data)[i] = PolygonOffsetData::gConvexPoints[index][i];
}
} else {
for (int i = 0; i < *numPts; ++i) {
(*data)[i] = PolygonOffsetData::gConvexPoints[index][*numPts - i - 1];
}
}
} else {
// procedurally generated
SkScalar width = kMaxPathHeight / 2;
SkScalar height = kMaxPathHeight / 2;
int numPtsArray[] = { 3, 4, 5, 5, 6, 8, 8, 20, 100 };
size_t arrayIndex = index - SK_ARRAY_COUNT(PolygonOffsetData::gConvexPoints);
SkASSERT(arrayIndex < SK_ARRAY_COUNT(numPtsArray));
*numPts = numPtsArray[arrayIndex];
if (arrayIndex == 3 || arrayIndex == 6) {
// squashed pentagon and octagon
width = kMaxPathHeight / 5;
}
*data = std::make_unique<SkPoint[]>(*numPts);
create_ngon(*numPts, data->get(), width, height, dir);
}
}
static void GetSimplePolygon(int index, SkPathDirection dir,
std::unique_ptr<SkPoint[]>* data, int* numPts) {
if (index < (int)SK_ARRAY_COUNT(PolygonOffsetData::gSimplePoints)) {
// manually specified
*numPts = (int)PolygonOffsetData::gSimpleSizes[index];
*data = std::make_unique<SkPoint[]>(*numPts);
if (SkPathDirection::kCW == dir) {
for (int i = 0; i < *numPts; ++i) {
(*data)[i] = PolygonOffsetData::gSimplePoints[index][i];
}
} else {
for (int i = 0; i < *numPts; ++i) {
(*data)[i] = PolygonOffsetData::gSimplePoints[index][*numPts - i - 1];
}
}
} else {
// procedurally generated
SkScalar width = kMaxPathHeight / 2;
SkScalar height = kMaxPathHeight / 2;
int numPtsArray[] = { 5, 7, 8, 20, 100 };
size_t arrayIndex = index - SK_ARRAY_COUNT(PolygonOffsetData::gSimplePoints);
arrayIndex = std::min(arrayIndex, SK_ARRAY_COUNT(numPtsArray) - 1);
SkASSERT(arrayIndex < SK_ARRAY_COUNT(numPtsArray));
*numPts = numPtsArray[arrayIndex];
// squash horizontally
width = kMaxPathHeight / 5;
*data = std::make_unique<SkPoint[]>(*numPts);
create_ngon(*numPts, data->get(), width, height, dir);
}
}
// Draw a single polygon with insets and potentially outsets
void drawPolygon(SkCanvas* canvas, int index, SkPoint* position) {
SkPoint center;
{
std::unique_ptr<SkPoint[]> data(nullptr);
int numPts;
if (fConvexOnly) {
GetConvexPolygon(index, SkPathDirection::kCW, &data, &numPts);
} else {
GetSimplePolygon(index, SkPathDirection::kCW, &data, &numPts);
}
SkRect bounds;
bounds.setBounds(data.get(), numPts);
if (!fConvexOnly) {
bounds.outset(kMaxOutset, kMaxOutset);
}
if (position->fX + bounds.width() > kGMWidth) {
position->fX = 0;
position->fY += kMaxPathHeight;
}
center = { position->fX + SkScalarHalf(bounds.width()), position->fY };
position->fX += bounds.width();
}
const SkPathDirection dirs[2] = { SkPathDirection::kCW, SkPathDirection::kCCW };
const float insets[] = { 5, 10, 15, 20, 25, 30, 35, 40 };
const float offsets[] = { 2, 5, 9, 14, 20, 27, 35, 44, -2, -5, -9 };
const SkColor colors[] = { 0xFF901313, 0xFF8D6214, 0xFF698B14, 0xFF1C8914,
0xFF148755, 0xFF146C84, 0xFF142482, 0xFF4A1480,
0xFF901313, 0xFF8D6214, 0xFF698B14 };
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(1);
std::unique_ptr<SkPoint[]> data(nullptr);
int numPts;
if (fConvexOnly) {
GetConvexPolygon(index, dirs[index % 2], &data, &numPts);
} else {
GetSimplePolygon(index, dirs[index % 2], &data, &numPts);
}
{
SkPath path;
path.moveTo(data.get()[0]);
for (int i = 1; i < numPts; ++i) {
path.lineTo(data.get()[i]);
}
path.close();
canvas->save();
canvas->translate(center.fX, center.fY);
canvas->drawPath(path, paint);
canvas->restore();
}
SkTDArray<SkPoint> offsetPoly;
size_t count = fConvexOnly ? SK_ARRAY_COUNT(insets) : SK_ARRAY_COUNT(offsets);
for (size_t i = 0; i < count; ++i) {
SkScalar offset = fConvexOnly ? insets[i] : offsets[i];
std::function<SkScalar(const SkPoint&)> offsetFunc;
bool result;
if (fConvexOnly) {
result = SkInsetConvexPolygon(data.get(), numPts, offset, &offsetPoly);
} else {
SkRect bounds;
bounds.setBoundsCheck(data.get(), numPts);
result = SkOffsetSimplePolygon(data.get(), numPts, bounds, offset, &offsetPoly);
}
if (result) {
SkPath path;
path.moveTo(offsetPoly[0]);
for (int j = 1; j < offsetPoly.count(); ++j) {
path.lineTo(offsetPoly[j]);
}
path.close();
paint.setColor(ToolUtils::color_to_565(colors[i]));
canvas->save();
canvas->translate(center.fX, center.fY);
canvas->drawPath(path, paint);
canvas->restore();
}
}
}
void onDraw(SkCanvas* canvas) override {
// the right edge of the last drawn path
SkPoint offset = { 0, SkScalarHalf(kMaxPathHeight) };
if (!fConvexOnly) {
offset.fY += kMaxOutset;
}
for (int i = 0; i < kNumPaths; ++i) {
this->drawPolygon(canvas, i, &offset);
}
}
private:
static constexpr int kNumPaths = 20;
static constexpr int kMaxPathHeight = 100;
static constexpr int kMaxOutset = 16;
static constexpr int kGMWidth = 512;
static constexpr int kGMHeight = 512;
bool fConvexOnly;
using INHERITED = GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new PolygonOffsetGM(true);)
DEF_GM(return new PolygonOffsetGM(false);)
} // namespace skiagm
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