5f4a754ea6
Change-Id: I8450193a6033e8b4262c1f23929a9b3d964a785a Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225550 Commit-Queue: Hal Canary <halcanary@google.com> Reviewed-by: Ben Wagner <bungeman@google.com>
510 lines
15 KiB
C++
510 lines
15 KiB
C++
/*
|
|
* 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/SkColorFilter.h"
|
|
#include "include/core/SkColorPriv.h"
|
|
#include "include/core/SkContourMeasure.h"
|
|
#include "include/core/SkGraphics.h"
|
|
#include "include/core/SkPath.h"
|
|
#include "include/core/SkRegion.h"
|
|
#include "include/core/SkShader.h"
|
|
#include "include/core/SkStream.h"
|
|
#include "include/core/SkTime.h"
|
|
#include "include/core/SkTypeface.h"
|
|
#include "include/core/SkVertices.h"
|
|
#include "include/effects/SkGradientShader.h"
|
|
#include "include/effects/SkOpPathEffect.h"
|
|
#include "include/private/SkTDArray.h"
|
|
#include "include/utils/SkRandom.h"
|
|
#include "samplecode/DecodeFile.h"
|
|
#include "samplecode/Sample.h"
|
|
#include "src/core/SkGeometry.h"
|
|
#include "src/core/SkOSFile.h"
|
|
#include "src/utils/SkUTF.h"
|
|
#include "tools/Resources.h"
|
|
#include "tools/timer/AnimTimer.h"
|
|
|
|
namespace {
|
|
static sk_sp<SkShader> make_shader0(SkIPoint* size) {
|
|
SkBitmap bm;
|
|
decode_file(GetResourceAsData("images/dog.jpg"), &bm);
|
|
*size = SkIPoint{bm.width(), bm.height()};
|
|
return bm.makeShader();
|
|
}
|
|
|
|
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), SkTileMode::kMirror);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static constexpr SkScalar DX = 20;
|
|
static constexpr SkScalar DY = 0;
|
|
static constexpr SkScalar kS = 50;
|
|
static constexpr SkScalar kT = 40;
|
|
|
|
struct PatchView : public Sample {
|
|
sk_sp<SkShader> fShader0;
|
|
sk_sp<SkShader> fShader1;
|
|
SkScalar fAngle = 0;
|
|
SkIPoint fSize0 = {0, 0},
|
|
fSize1 = {0, 0};
|
|
SkPoint fPts[12] = {
|
|
{kS * 0, kT * 1},
|
|
{kS * 1, kT * 1},
|
|
{kS * 2, kT * 1},
|
|
{kS * 3, kT * 1},
|
|
{kS * 3, kT * 2},
|
|
{kS * 3, kT * 3},
|
|
{kS * 3, kT * 4},
|
|
{kS * 2, kT * 4},
|
|
{kS * 1, kT * 4},
|
|
{kS * 0, kT * 4},
|
|
{kS * 0, kT * 3},
|
|
{kS * 0, kT * 2},
|
|
};
|
|
|
|
void onOnceBeforeDraw() override {
|
|
fShader0 = make_shader0(&fSize0);
|
|
fSize1 = fSize0;
|
|
if (fSize0.fX == 0 || fSize0.fY == 0) {
|
|
fSize1.set(2, 2);
|
|
}
|
|
fShader1 = make_shader1(fSize1);
|
|
this->setBGColor(SK_ColorGRAY);
|
|
}
|
|
|
|
SkString name() override { return SkString("Patch"); }
|
|
|
|
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);
|
|
{
|
|
SkMatrix m;
|
|
m.setSkew(1, 0);
|
|
paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
|
|
}
|
|
{
|
|
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 AnimTimer& 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;
|
|
};
|
|
} // namespace
|
|
DEF_SAMPLE( return new PatchView(); )
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
namespace {
|
|
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 {
|
|
enum { N = 100 };
|
|
SkPath fPath;
|
|
sk_sp<SkVertices> fVertices[N];
|
|
SkPaint fSkeletonP, fStrokeP, fVertsP;
|
|
bool fDirty = true;
|
|
|
|
public:
|
|
PseudoInkView() {
|
|
fSkeletonP.setStyle(SkPaint::kStroke_Style);
|
|
fSkeletonP.setAntiAlias(true);
|
|
|
|
fStrokeP.setStyle(SkPaint::kStroke_Style);
|
|
fStrokeP.setStrokeWidth(30);
|
|
fStrokeP.setColor(0x44888888);
|
|
}
|
|
|
|
protected:
|
|
SkString name() override { return SkString("PseudoInk"); }
|
|
|
|
bool onAnimate(const AnimTimer& timer) override { return true; }
|
|
|
|
void onDrawContent(SkCanvas* canvas) override {
|
|
if (fDirty) {
|
|
for (int i = 0; i < N; ++i) {
|
|
fVertices[i] = make_verts(fPath, 30);
|
|
}
|
|
fDirty = false;
|
|
}
|
|
for (int i = 0; i < N; ++i) {
|
|
canvas->drawVertices(fVertices[i], SkBlendMode::kSrc, fVertsP);
|
|
canvas->translate(1, 1);
|
|
}
|
|
// 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);
|
|
fDirty = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
typedef Sample INHERITED;
|
|
};
|
|
} // namespace
|
|
DEF_SAMPLE( return new PseudoInkView(); )
|
|
|
|
namespace {
|
|
// Show stroking options using patheffects (and pathops)
|
|
// and why strokeandfill is a hacks
|
|
class ManyStrokesView : public Sample {
|
|
SkPath fPath;
|
|
sk_sp<SkPathEffect> fPE[6];
|
|
|
|
public:
|
|
ManyStrokesView() {
|
|
fPE[0] = SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap);
|
|
|
|
auto p0 = SkStrokePathEffect::Make(25, SkPaint::kRound_Join, SkPaint::kRound_Cap);
|
|
auto p1 = SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap);
|
|
fPE[1] = SkMergePathEffect::Make(p0, p1, SkPathOp::kDifference_SkPathOp);
|
|
|
|
fPE[2] = SkMergePathEffect::Make(nullptr, p1, SkPathOp::kDifference_SkPathOp);
|
|
fPE[3] = SkMergePathEffect::Make(nullptr, p1, SkPathOp::kUnion_SkPathOp);
|
|
fPE[4] = SkMergePathEffect::Make(p0, nullptr, SkPathOp::kDifference_SkPathOp);
|
|
fPE[5] = SkMergePathEffect::Make(p0, nullptr, SkPathOp::kIntersect_SkPathOp);
|
|
}
|
|
|
|
protected:
|
|
SkString name() override { return SkString("ManyStrokes"); }
|
|
|
|
bool onAnimate(const AnimTimer& timer) override { return true; }
|
|
|
|
void dodraw(SkCanvas* canvas, sk_sp<SkPathEffect> pe, SkScalar x, SkScalar y,
|
|
const SkPaint* ptr = nullptr) {
|
|
SkPaint paint;
|
|
paint.setAntiAlias(true);
|
|
paint.setPathEffect(pe);
|
|
canvas->save();
|
|
canvas->translate(x, y);
|
|
canvas->drawPath(fPath, ptr ? *ptr : paint);
|
|
|
|
paint.setPathEffect(nullptr);
|
|
paint.setStyle(SkPaint::kStroke_Style);
|
|
paint.setColor(SK_ColorGREEN);
|
|
canvas->drawPath(fPath, paint);
|
|
|
|
canvas->restore();
|
|
}
|
|
|
|
void onDrawContent(SkCanvas* canvas) override {
|
|
SkPaint p;
|
|
p.setColor(0);
|
|
this->dodraw(canvas, nullptr, 0, 0, &p);
|
|
|
|
this->dodraw(canvas, fPE[0], 300, 0);
|
|
this->dodraw(canvas, fPE[1], 0, 300);
|
|
this->dodraw(canvas, fPE[2], 300, 300);
|
|
this->dodraw(canvas, fPE[3], 600, 300);
|
|
this->dodraw(canvas, fPE[4], 900, 0);
|
|
this->dodraw(canvas, fPE[5], 900, 300);
|
|
|
|
p.setColor(SK_ColorBLACK);
|
|
p.setStyle(SkPaint::kStrokeAndFill_Style);
|
|
p.setStrokeJoin(SkPaint::kRound_Join);
|
|
p.setStrokeCap(SkPaint::kRound_Cap);
|
|
p.setStrokeWidth(20);
|
|
this->dodraw(canvas, nullptr, 600, 0, &p);
|
|
}
|
|
|
|
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);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
typedef Sample INHERITED;
|
|
};
|
|
} // namespace
|
|
DEF_SAMPLE( return new ManyStrokesView(); )
|