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skia2/samplecode/SampleSlides.cpp
Herb Derby 73e6a66146 Replace SK_ARRAY_COUNT with std::size() for skia/samplecode 
Change-Id: Ibfa2c0efa3e4addf21aa400e3d323675ac0185ef
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551886
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2022-06-22 14:02:56 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkPaint.h"
#include "include/core/SkVertices.h"
#include "include/effects/SkGradientShader.h"
#include "samplecode/Sample.h"
#include "src/core/SkBlurMask.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
#include "tools/ToolUtils.h"
#define BG_COLOR 0xFFDDDDDD
typedef void (*SlideProc)(SkCanvas*);
///////////////////////////////////////////////////////////////////////////////
#include "include/effects/Sk1DPathEffect.h"
#include "include/effects/Sk2DPathEffect.h"
#include "include/effects/SkCornerPathEffect.h"
#include "include/effects/SkDashPathEffect.h"
#include "include/effects/SkDiscretePathEffect.h"
static void compose_pe(SkPaint* paint) {
SkPathEffect* pe = paint->getPathEffect();
sk_sp<SkPathEffect> corner = SkCornerPathEffect::Make(25);
sk_sp<SkPathEffect> compose;
if (pe) {
compose = SkPathEffect::MakeCompose(sk_ref_sp(pe), corner);
} else {
compose = corner;
}
paint->setPathEffect(compose);
}
static void hair_pe(SkPaint* paint) {
paint->setStrokeWidth(0);
}
static void hair2_pe(SkPaint* paint) {
paint->setStrokeWidth(0);
compose_pe(paint);
}
static void stroke_pe(SkPaint* paint) {
paint->setStrokeWidth(12);
compose_pe(paint);
}
static void dash_pe(SkPaint* paint) {
SkScalar inter[] = { 20, 10, 10, 10 };
paint->setStrokeWidth(12);
paint->setPathEffect(SkDashPathEffect::Make(inter, std::size(inter), 0));
compose_pe(paint);
}
static const int gXY[] = {
4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
};
static void scale(SkPath* path, SkScalar scale) {
SkMatrix m;
m.setScale(scale, scale);
path->transform(m);
}
static void one_d_pe(SkPaint* paint) {
SkPath path;
path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
for (unsigned i = 2; i < std::size(gXY); i += 2)
path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
path.close();
path.offset(SkIntToScalar(-6), 0);
scale(&path, 1.5f);
paint->setPathEffect(SkPath1DPathEffect::Make(path, SkIntToScalar(21), 0,
SkPath1DPathEffect::kRotate_Style));
compose_pe(paint);
}
typedef void (*PE_Proc)(SkPaint*);
static const PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
static void fill_pe(SkPaint* paint) {
paint->setStyle(SkPaint::kFill_Style);
paint->setPathEffect(nullptr);
}
static void discrete_pe(SkPaint* paint) {
paint->setPathEffect(SkDiscretePathEffect::Make(10, 4));
}
static sk_sp<SkPathEffect> MakeTileEffect() {
SkMatrix m;
m.setScale(SkIntToScalar(12), SkIntToScalar(12));
SkPath path;
path.addCircle(0, 0, SkIntToScalar(5));
return SkPath2DPathEffect::Make(m, path);
}
static void tile_pe(SkPaint* paint) {
paint->setPathEffect(MakeTileEffect());
}
static const PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
static void patheffect_slide(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
SkPath path;
path.moveTo(20, 20);
path.lineTo(70, 120);
path.lineTo(120, 30);
path.lineTo(170, 80);
path.lineTo(240, 50);
size_t i;
canvas->save();
for (i = 0; i < std::size(gPE); i++) {
gPE[i](&paint);
canvas->drawPath(path, paint);
canvas->translate(0, 75);
}
canvas->restore();
path.reset();
SkRect r = { 0, 0, 250, 120 };
path.addOval(r, SkPathDirection::kCW);
r.inset(50, 50);
path.addRect(r, SkPathDirection::kCCW);
canvas->translate(320, 20);
for (i = 0; i < std::size(gPE2); i++) {
gPE2[i](&paint);
canvas->drawPath(path, paint);
canvas->translate(0, 160);
}
}
///////////////////////////////////////////////////////////////////////////////
#include "include/effects/SkGradientShader.h"
struct GradData {
int fCount;
const SkColor* fColors;
const SkScalar* fPos;
};
static const SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
};
static const SkScalar gPos0[] = { 0, SK_Scalar1 };
static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
static const SkScalar gPos2[] = {
0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
};
static const GradData gGradData[] = {
{ 2, gColors, nullptr },
{ 2, gColors, gPos0 },
{ 2, gColors, gPos1 },
{ 5, gColors, nullptr },
{ 5, gColors, gPos2 }
};
static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
}
static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::MakeRadial(center, center.fX, data.fColors,
data.fPos, data.fCount, tm);
}
static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
}
static sk_sp<SkShader> Make2Conical(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
SkPoint center0, center1;
center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
return SkGradientShader::MakeTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm);
}
typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkTileMode);
static const GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Conical
};
static void gradient_slide(SkCanvas* canvas) {
SkPoint pts[2] = {
{ 0, 0 },
{ SkIntToScalar(100), SkIntToScalar(100) }
};
SkTileMode tm = SkTileMode::kClamp;
SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
SkPaint paint;
paint.setAntiAlias(true);
paint.setDither(true);
canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
for (size_t i = 0; i < std::size(gGradData); i++) {
canvas->save();
for (size_t j = 0; j < std::size(gGradMakers); j++) {
paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
canvas->drawRect(r, paint);
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
}
///////////////////////////////////////////////////////////////////////////////
#include "include/core/SkStream.h"
#include "include/utils/SkRandom.h"
#include "samplecode/DecodeFile.h"
#include "src/core/SkOSFile.h"
static sk_sp<SkShader> make_shader0(SkIPoint* size) {
SkBitmap bm;
decode_file("/skimages/logo.gif", &bm);
size->set(bm.width(), bm.height());
return bm.makeShader(SkSamplingOptions(SkFilterMode::kLinear));
}
static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
SkPoint pts[] = { { 0, 0 },
{ SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
return SkGradientShader::MakeLinear(pts, colors, nullptr,
std::size(colors), SkTileMode::kMirror);
}
class Rec {
public:
SkVertices::VertexMode fMode;
int fCount;
SkPoint* fVerts;
SkPoint* fTexs;
Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
~Rec() { delete[] fVerts; delete[] fTexs; }
};
static void make_tris(Rec* rec) {
int n = 10;
SkRandom rand;
rec->fMode = SkVertices::kTriangles_VertexMode;
rec->fCount = n * 3;
rec->fVerts = new SkPoint[rec->fCount];
for (int i = 0; i < n; i++) {
SkPoint* v = &rec->fVerts[i*3];
for (int j = 0; j < 3; j++) {
v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
}
}
}
static void make_fan(Rec* rec, int texWidth, int texHeight) {
const SkScalar tx = SkIntToScalar(texWidth);
const SkScalar ty = SkIntToScalar(texHeight);
const int n = 24;
rec->fMode = SkVertices::kTriangleFan_VertexMode;
rec->fCount = n + 2;
rec->fVerts = new SkPoint[rec->fCount];
rec->fTexs = new SkPoint[rec->fCount];
SkPoint* v = rec->fVerts;
SkPoint* t = rec->fTexs;
v[0].set(0, 0);
t[0].set(0, 0);
for (int i = 0; i < n; i++) {
SkScalar r = SK_ScalarPI * 2 * i / n,
sin = SkScalarSin(r),
cos = SkScalarCos(r);
v[i+1].set(cos, sin);
t[i+1].set(i*tx/n, ty);
}
v[n+1] = v[1];
t[n+1].set(tx, ty);
SkMatrix m;
m.setScale(SkIntToScalar(100), SkIntToScalar(100));
m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
m.mapPoints(v, rec->fCount);
}
static void make_strip(Rec* rec, int texWidth, int texHeight) {
const SkScalar tx = SkIntToScalar(texWidth);
const SkScalar ty = SkIntToScalar(texHeight);
const int n = 24;
rec->fMode = SkVertices::kTriangleStrip_VertexMode;
rec->fCount = 2 * (n + 1);
rec->fVerts = new SkPoint[rec->fCount];
rec->fTexs = new SkPoint[rec->fCount];
SkPoint* v = rec->fVerts;
SkPoint* t = rec->fTexs;
for (int i = 0; i < n; i++) {
SkScalar r = SK_ScalarPI * 2 * i / n,
sin = SkScalarSin(r),
cos = SkScalarCos(r);
v[i*2 + 0].set(cos/2, sin/2);
v[i*2 + 1].set(cos, sin);
t[i*2 + 0].set(tx * i / n, ty);
t[i*2 + 1].set(tx * i / n, 0);
}
v[2*n + 0] = v[0];
v[2*n + 1] = v[1];
t[2*n + 0].set(tx, ty);
t[2*n + 1].set(tx, 0);
SkMatrix m;
m.setScale(SkIntToScalar(100), SkIntToScalar(100));
m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
m.mapPoints(v, rec->fCount);
}
static void mesh_slide(SkCanvas* canvas) {
Rec fRecs[3];
SkIPoint size;
auto fShader0 = make_shader0(&size);
auto fShader1 = make_shader1(size);
make_strip(&fRecs[0], size.fX, size.fY);
make_fan(&fRecs[1], size.fX, size.fY);
make_tris(&fRecs[2]);
SkPaint paint;
paint.setDither(true);
for (size_t i = 0; i < std::size(fRecs); i++) {
auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount,
fRecs[i].fVerts, fRecs[i].fTexs, nullptr);
canvas->save();
paint.setShader(nullptr);
canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
canvas->translate(SkIntToScalar(210), 0);
paint.setShader(fShader0);
canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
canvas->translate(SkIntToScalar(210), 0);
paint.setShader(fShader1);
canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
canvas->restore();
canvas->translate(0, SkIntToScalar(250));
}
}
///////////////////////////////////////////////////////////////////////////////
#include "include/core/SkTypeface.h"
///////////////////////////////////////////////////////////////////////////////
#include "include/core/SkImageEncoder.h"
static const SlideProc gProc[] = {
patheffect_slide,
gradient_slide,
mesh_slide,
};
class SlideView : public Sample {
int fIndex;
bool fOnce;
public:
SlideView() {
fOnce = false;
}
void init() {
if (fOnce) {
return;
}
fOnce = true;
fIndex = 0;
SkBitmap bm;
bm.allocN32Pixels(1024, 768);
SkCanvas canvas(bm);
SkScalar s = SkIntToScalar(1024) / 640;
canvas.scale(s, s);
for (size_t i = 0; i < std::size(gProc); i++) {
canvas.save();
canvas.drawColor(BG_COLOR);
gProc[i](&canvas);
canvas.restore();
SkString str;
str.printf("/skimages/slide_%zu.png", i);
ToolUtils::EncodeImageToFile(str.c_str(), bm, SkEncodedImageFormat::kPNG, 100);
}
this->setBGColor(BG_COLOR);
}
protected:
SkString name() override { return SkString("Slides"); }
void onDrawContent(SkCanvas* canvas) override {
this->init();
gProc[fIndex](canvas);
}
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
this->init();
fIndex = (fIndex + 1) % std::size(gProc);
return nullptr;
}
private:
using INHERITED = Sample;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new SlideView(); )
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