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skia2/samplecode/SamplePatch.cpp
Mike Reed 72542816ca add sample for retained vertices 
Bug: skia:
Change-Id: I79d9aa533af3f912017b83cec59c23859a822dd9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/197241
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
2019-03-05 15:47:03 +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 "DecodeFile.h"
#include "Sample.h"
#include "SkAnimTimer.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUTF.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkVertices.h"
#include "SkOSFile.h"
#include "SkStream.h"
#include "SkGeometry.h" // private include :(
static sk_sp<SkShader> make_shader0(SkIPoint* size) {
SkBitmap bm;
// decode_file("/skimages/progressivejpg.jpg", &bm);
decode_file("/skimages/logo.png", &bm);
size->set(bm.width(), bm.height());
return SkShader::MakeBitmapShader(bm, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode);
}
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,
SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode);
}
///////////////////////////////////////////////////////////////////////////////
class Patch {
public:
Patch() { sk_bzero(fPts, sizeof(fPts)); }
~Patch() {}
void setPatch(const SkPoint pts[12]) {
memcpy(fPts, pts, 12 * sizeof(SkPoint));
fPts[12] = pts[0]; // the last shall be first
}
void setBounds(int w, int h) { fW = w; fH = h; }
void draw(SkCanvas*, const SkPaint&, int segsU, int segsV,
bool doTextures, bool doColors);
private:
SkPoint fPts[13];
int fW, fH;
};
static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) {
SkScalar t = 0;
SkScalar dt = SK_Scalar1 / segs;
samples[0] = cubic[0];
for (int i = 1; i < segs; i++) {
t += dt;
SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr);
}
}
static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv,
SkPoint* pt) {
const int TL = 0;
const int TR = nu;
const int BR = TR + nv;
const int BL = BR + nu;
SkScalar u = SkIntToScalar(iu) / nu;
SkScalar v = SkIntToScalar(iv) / nv;
SkScalar uv = u * v;
SkScalar Uv = (1 - u) * v;
SkScalar uV = u * (1 - v);
SkScalar UV = (1 - u) * (1 - v);
SkScalar x0 = UV * edge[TL].fX + uV * edge[TR].fX + Uv * edge[BL].fX + uv * edge[BR].fX;
SkScalar y0 = UV * edge[TL].fY + uV * edge[TR].fY + Uv * edge[BL].fY + uv * edge[BR].fY;
SkScalar x = (1 - v) * edge[TL+iu].fX + u * edge[TR+iv].fX +
v * edge[BR+nu-iu].fX + (1 - u) * edge[BL+nv-iv].fX - x0;
SkScalar y = (1 - v) * edge[TL+iu].fY + u * edge[TR+iv].fY +
v * edge[BR+nu-iu].fY + (1 - u) * edge[BL+nv-iv].fY - y0;
pt->set(x, y);
}
static SkColor make_color(SkScalar s, SkScalar t) {
return SkColorSetARGB(0xFF, SkUnitScalarClampToByte(s), SkUnitScalarClampToByte(t), 0);
}
void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
bool doTextures, bool doColors) {
if (nu < 1 || nv < 1) {
return;
}
int i, npts = (nu + nv) * 2;
SkAutoSTMalloc<16, SkPoint> storage(npts + 1);
SkPoint* edge0 = storage.get();
SkPoint* edge1 = edge0 + nu;
SkPoint* edge2 = edge1 + nv;
SkPoint* edge3 = edge2 + nu;
// evaluate the edge points
eval_patch_edge(fPts + 0, edge0, nu);
eval_patch_edge(fPts + 3, edge1, nv);
eval_patch_edge(fPts + 6, edge2, nu);
eval_patch_edge(fPts + 9, edge3, nv);
edge3[nv] = edge0[0]; // the last shall be first
for (i = 0; i < npts; i++) {
// canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint);
}
int row, vertCount = (nu + 1) * (nv + 1);
SkAutoTMalloc<SkPoint> vertStorage(vertCount);
SkPoint* verts = vertStorage.get();
// first row
memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint));
// rows
SkPoint* r = verts;
for (row = 1; row < nv; row++) {
r += nu + 1;
r[0] = edge3[nv - row];
for (int col = 1; col < nu; col++) {
eval_sheet(edge0, nu, nv, col, row, &r[col]);
}
r[nu] = edge1[row];
}
// last row
SkPoint* last = verts + nv * (nu + 1);
for (i = 0; i <= nu; i++) {
last[i] = edge2[nu - i];
}
// canvas->drawPoints(verts, vertCount, paint);
int stripCount = (nu + 1) * 2;
SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2);
SkAutoTMalloc<SkColor> colorStorage(stripCount);
SkPoint* strip = stripStorage.get();
SkPoint* tex = strip + stripCount;
SkColor* colors = colorStorage.get();
SkScalar t = 0;
const SkScalar ds = SK_Scalar1 * fW / nu;
const SkScalar dt = SK_Scalar1 * fH / nv;
r = verts;
for (row = 0; row < nv; row++) {
SkPoint* upper = r;
SkPoint* lower = r + nu + 1;
r = lower;
SkScalar s = 0;
for (i = 0; i <= nu; i++) {
strip[i*2 + 0] = *upper++;
strip[i*2 + 1] = *lower++;
tex[i*2 + 0].set(s, t);
tex[i*2 + 1].set(s, t + dt);
colors[i*2 + 0] = make_color(s/fW, t/fH);
colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH);
s += ds;
}
t += dt;
canvas->drawVertices(SkVertices::MakeCopy(SkVertices::kTriangleStrip_VertexMode, stripCount,
strip, doTextures ? tex : nullptr,
doColors ? colors : nullptr),
SkBlendMode::kModulate, paint);
}
}
static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
Patch* patch) {
SkAutoCanvasRestore ar(canvas, true);
patch->draw(canvas, paint, nu, nv, false, false);
canvas->translate(SkIntToScalar(180), 0);
patch->draw(canvas, paint, nu, nv, true, false);
canvas->translate(SkIntToScalar(180), 0);
patch->draw(canvas, paint, nu, nv, false, true);
canvas->translate(SkIntToScalar(180), 0);
patch->draw(canvas, paint, nu, nv, true, true);
}
const SkScalar DX = 20;
const SkScalar DY = 0;
class PatchView : public Sample {
SkScalar fAngle;
sk_sp<SkShader> fShader0;
sk_sp<SkShader> fShader1;
SkIPoint fSize0, fSize1;
SkPoint fPts[12];
public:
PatchView() : fAngle(0) {
fShader0 = make_shader0(&fSize0);
fSize1 = fSize0;
if (fSize0.fX == 0 || fSize0.fY == 0) {
fSize1.set(2, 2);
}
fShader1 = make_shader1(fSize1);
const SkScalar S = SkIntToScalar(50);
const SkScalar T = SkIntToScalar(40);
fPts[0].set(S*0, T);
fPts[1].set(S*1, T);
fPts[2].set(S*2, T);
fPts[3].set(S*3, T);
fPts[4].set(S*3, T*2);
fPts[5].set(S*3, T*3);
fPts[6].set(S*3, T*4);
fPts[7].set(S*2, T*4);
fPts[8].set(S*1, T*4);
fPts[9].set(S*0, T*4);
fPts[10].set(S*0, T*3);
fPts[11].set(S*0, T*2);
this->setBGColor(SK_ColorGRAY);
}
protected:
bool onQuery(Sample::Event* evt) override {
if (Sample::TitleQ(*evt)) {
Sample::TitleR(evt, "Patch");
return true;
}
return this->INHERITED::onQuery(evt);
}
void onDrawContent(SkCanvas* canvas) override {
const int nu = 10;
const int nv = 10;
SkPaint paint;
paint.setDither(true);
paint.setFilterQuality(kLow_SkFilterQuality);
canvas->translate(DX, DY);
Patch patch;
paint.setShader(fShader0);
if (fSize0.fX == 0) {
fSize0.fX = 1;
}
if (fSize0.fY == 0) {
fSize0.fY = 1;
}
patch.setBounds(fSize0.fX, fSize0.fY);
patch.setPatch(fPts);
drawpatches(canvas, paint, nu, nv, &patch);
paint.setShader(nullptr);
paint.setAntiAlias(true);
paint.setStrokeWidth(SkIntToScalar(5));
canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint);
canvas->translate(0, SkIntToScalar(300));
paint.setAntiAlias(false);
paint.setShader(fShader1);
if (true) {
SkMatrix m;
m.setSkew(1, 0);
paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
}
if (true) {
SkMatrix m;
m.setRotate(fAngle);
paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
}
patch.setBounds(fSize1.fX, fSize1.fY);
drawpatches(canvas, paint, nu, nv, &patch);
}
bool onAnimate(const SkAnimTimer& timer) override {
fAngle = timer.scaled(60, 360);
return true;
}
class PtClick : public Click {
public:
int fIndex;
PtClick(Sample* view, int index) : Click(view), fIndex(index) {}
};
static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) {
return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5);
}
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
x -= DX;
y -= DY;
for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
if (hittest(fPts[i], x, y)) {
return new PtClick(this, (int)i);
}
}
return this->INHERITED::onFindClickHandler(x, y, modi);
}
bool onClick(Click* click) override {
fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY);
return true;
}
private:
typedef Sample INHERITED;
};
DEF_SAMPLE( return new PatchView(); )
//////////////////////////////////////////////////////////////////////////////
#include "SkContourMeasure.h"
#include "SkTDArray.h"
static sk_sp<SkVertices> make_verts(const SkPath& path, SkScalar width) {
auto meas = SkContourMeasureIter(path, false).next();
if (!meas) {
return nullptr;
}
const SkPoint src[2] = {
{ 0, -width/2 }, { 0, width/2 },
};
SkTDArray<SkPoint> pts;
const SkScalar step = 2;
for (SkScalar distance = 0; distance < meas->length(); distance += step) {
SkMatrix mx;
if (!meas->getMatrix(distance, &mx)) {
continue;
}
SkPoint* dst = pts.append(2);
mx.mapPoints(dst, src, 2);
}
int vertCount = pts.count();
int indexCount = 0; // no texture
unsigned flags = SkVertices::kHasColors_BuilderFlag |
SkVertices::kIsNonVolatile_BuilderFlag;
SkVertices::Builder builder(SkVertices::kTriangleStrip_VertexMode,
vertCount, indexCount, flags);
memcpy(builder.positions(), pts.begin(), vertCount * sizeof(SkPoint));
SkRandom rand;
for (int i = 0; i < vertCount; ++i) {
builder.colors()[i] = rand.nextU() | 0xFF000000;
}
SkDebugf("vert count = %d\n", vertCount);
return builder.detach();
}
class PseudoInkView : public Sample {
SkPath fPath;
sk_sp<SkVertices> fVertices;
SkPaint fSkeletonP, fStrokeP, fVertsP;
public:
PseudoInkView() {
fSkeletonP.setStyle(SkPaint::kStroke_Style);
fSkeletonP.setAntiAlias(true);
fStrokeP.setStyle(SkPaint::kStroke_Style);
fStrokeP.setStrokeWidth(30);
fStrokeP.setColor(0x44888888);
}
protected:
bool onQuery(Sample::Event* evt) override {
if (Sample::TitleQ(*evt)) {
Sample::TitleR(evt, "PseudoInk");
return true;
}
return this->INHERITED::onQuery(evt);
}
bool onAnimate(const SkAnimTimer& timer) override {
return true;
}
void onDrawContent(SkCanvas* canvas) override {
if (!fVertices) {
fVertices = make_verts(fPath, 30);
}
for (int i = 0; i < 10; ++i) {
canvas->drawVertices(fVertices, SkBlendMode::kSrc, fVertsP);
canvas->translate(10, 10);
}
// canvas->drawPath(fPath, fStrokeP);
// canvas->drawPath(fPath, fSkeletonP);
}
Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
Click* click = new Click(this);
fPath.reset();
fPath.moveTo(x, y);
return click;
}
bool onClick(Click* click) override {
switch (click->fState) {
case Click::kMoved_State:
fPath.lineTo(click->fCurr);
fVertices.reset();
break;
default:
break;
}
return true;
}
private:
typedef Sample INHERITED;
};
DEF_SAMPLE( return new PseudoInkView(); )
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