417 lines
13 KiB
C++
417 lines
13 KiB
C++
|
#include "SampleCode.h"
|
||
|
|
#include "SkView.h"
|
||
|
|
#include "SkCanvas.h"
|
||
|
|
#include "SkGradientShader.h"
|
||
|
|
#include "SkGraphics.h"
|
||
|
|
#include "SkImageDecoder.h"
|
||
|
|
#include "SkPath.h"
|
||
|
|
#include "SkPorterDuff.h"
|
||
|
|
#include "SkRandom.h"
|
||
|
|
#include "SkRegion.h"
|
||
|
|
#include "SkShader.h"
|
||
|
|
#include "SkUtils.h"
|
||
|
|
#include "SkXfermode.h"
|
||
|
|
#include "SkColorPriv.h"
|
||
|
|
#include "SkColorFilter.h"
|
||
|
|
#include "SkTime.h"
|
||
|
|
#include "SkTypeface.h"
|
||
|
|
|
||
|
|
#include "SkOSFile.h"
|
||
|
|
#include "SkStream.h"
|
||
|
|
|
||
|
|
#include "SkGeometry.h" // private include :(
|
||
|
|
|
||
|
|
static void drawtriangle(SkCanvas* canvas, const SkPaint& paint,
|
||
|
|
const SkPoint pts[3]) {
|
||
|
|
SkPath path;
|
||
|
|
|
||
|
|
path.moveTo(pts[0]);
|
||
|
|
path.lineTo(pts[1]);
|
||
|
|
path.lineTo(pts[2]);
|
||
|
|
|
||
|
|
canvas->drawPath(path, paint);
|
||
|
|
}
|
||
|
|
|
||
|
|
static SkShader* make_shader0(SkIPoint* size) {
|
||
|
|
SkBitmap bm;
|
||
|
|
|
||
|
|
// SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm);
|
||
|
|
SkImageDecoder::DecodeFile("/skimages/beach.jpg", &bm);
|
||
|
|
size->set(bm.width(), bm.height());
|
||
|
|
return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode,
|
||
|
|
SkShader::kClamp_TileMode);
|
||
|
|
}
|
||
|
|
|
||
|
|
static 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::CreateLinear(pts, colors, NULL,
|
||
|
|
SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
class Patch {
|
||
|
|
public:
|
||
|
|
Patch() { 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], NULL, NULL);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
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 = SkScalarMul(u, v);
|
||
|
|
SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v);
|
||
|
|
SkScalar uV = SkScalarMul(u, SK_Scalar1 - v);
|
||
|
|
SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v);
|
||
|
|
|
||
|
|
SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) +
|
||
|
|
SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX);
|
||
|
|
SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) +
|
||
|
|
SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY);
|
||
|
|
|
||
|
|
SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) +
|
||
|
|
SkScalarMul(u, edge[TR+iv].fX) +
|
||
|
|
SkScalarMul(v, edge[BR+nu-iu].fX) +
|
||
|
|
SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0;
|
||
|
|
SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) +
|
||
|
|
SkScalarMul(u, edge[TR+iv].fY) +
|
||
|
|
SkScalarMul(v, edge[BR+nu-iu].fY) +
|
||
|
|
SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0;
|
||
|
|
pt->set(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ScalarTo255(SkScalar v) {
|
||
|
|
int scale = SkScalarToFixed(v) >> 8;
|
||
|
|
if (scale < 0) {
|
||
|
|
scale = 0;
|
||
|
|
} else if (scale > 255) {
|
||
|
|
scale = 255;
|
||
|
|
}
|
||
|
|
return scale;
|
||
|
|
}
|
||
|
|
|
||
|
|
static SkColor make_color(SkScalar s, SkScalar t) {
|
||
|
|
int cs = ScalarTo255(s);
|
||
|
|
int ct = ScalarTo255(t);
|
||
|
|
return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 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(SkCanvas::kTriangleStrip_VertexMode, stripCount,
|
||
|
|
strip, doTextures ? tex : NULL,
|
||
|
|
doColors ? colors : NULL, NULL,
|
||
|
|
NULL, 0, paint);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
|
||
|
|
Patch* patch) {
|
||
|
|
|
||
|
|
SkAutoCanvasRestore ar(canvas, true);
|
||
|
|
|
||
|
|
patch->draw(canvas, paint, 10, 10, false, false);
|
||
|
|
canvas->translate(SkIntToScalar(300), 0);
|
||
|
|
patch->draw(canvas, paint, 10, 10, true, false);
|
||
|
|
canvas->translate(SkIntToScalar(300), 0);
|
||
|
|
patch->draw(canvas, paint, 10, 10, false, true);
|
||
|
|
canvas->translate(SkIntToScalar(300), 0);
|
||
|
|
patch->draw(canvas, paint, 10, 10, true, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
class PatchView : public SkView {
|
||
|
|
SkShader* fShader0;
|
||
|
|
SkShader* fShader1;
|
||
|
|
SkIPoint fSize0, fSize1;
|
||
|
|
SkPoint fPts[12];
|
||
|
|
|
||
|
|
public:
|
||
|
|
PatchView() {
|
||
|
|
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(90);
|
||
|
|
const SkScalar T = SkIntToScalar(64);
|
||
|
|
fPts[0].set(S*1, T);
|
||
|
|
fPts[1].set(S*2, T);
|
||
|
|
fPts[2].set(S*3, T);
|
||
|
|
fPts[3].set(S*4, T);
|
||
|
|
fPts[4].set(S*4, T*2);
|
||
|
|
fPts[5].set(S*4, T*3);
|
||
|
|
fPts[6].set(S*4, T*4);
|
||
|
|
fPts[7].set(S*3, T*4);
|
||
|
|
fPts[8].set(S*2, T*4);
|
||
|
|
fPts[9].set(S*1, T*4);
|
||
|
|
fPts[10].set(S*1, T*3);
|
||
|
|
fPts[11].set(S*1, T*2);
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual ~PatchView() {
|
||
|
|
fShader0->safeUnref();
|
||
|
|
fShader1->safeUnref();
|
||
|
|
}
|
||
|
|
|
||
|
|
protected:
|
||
|
|
// overrides from SkEventSink
|
||
|
|
virtual bool onQuery(SkEvent* evt) {
|
||
|
|
if (SampleCode::TitleQ(*evt))
|
||
|
|
{
|
||
|
|
SkString str("Patch");
|
||
|
|
SampleCode::TitleR(evt, str.c_str());
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return this->INHERITED::onQuery(evt);
|
||
|
|
}
|
||
|
|
|
||
|
|
void drawBG(SkCanvas* canvas) {
|
||
|
|
canvas->drawColor(SK_ColorGRAY);
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual void onDraw(SkCanvas* canvas) {
|
||
|
|
this->drawBG(canvas);
|
||
|
|
|
||
|
|
SkPaint paint;
|
||
|
|
paint.setDither(true);
|
||
|
|
paint.setFilterBitmap(true);
|
||
|
|
|
||
|
|
if (false) {
|
||
|
|
SkPath p;
|
||
|
|
p.moveTo(0, 0);
|
||
|
|
p.lineTo(SkIntToScalar(30000), SkIntToScalar(30000));
|
||
|
|
paint.setStyle(SkPaint::kStroke_Style);
|
||
|
|
paint.setStrokeWidth(SkIntToScalar(4));
|
||
|
|
paint.setAntiAlias(true);
|
||
|
|
canvas->scale(SkIntToScalar(3), SkIntToScalar(3));
|
||
|
|
canvas->drawPath(p, paint);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (false) {
|
||
|
|
for (int dy = -1; dy <= 2; dy++) {
|
||
|
|
canvas->save();
|
||
|
|
if (dy == 2) {
|
||
|
|
canvas->translate(0, SK_Scalar1/2);
|
||
|
|
} else {
|
||
|
|
canvas->translate(0, SkIntToScalar(dy)/100);
|
||
|
|
}
|
||
|
|
|
||
|
|
SkBitmap bm;
|
||
|
|
bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
|
||
|
|
bm.allocPixels();
|
||
|
|
SkCanvas c(bm);
|
||
|
|
SkRect r = { 0, 0, 20*SK_Scalar1, SK_Scalar1 };
|
||
|
|
for (int y = 0; y < 20; y++) {
|
||
|
|
SkPaint p;
|
||
|
|
p.setARGB(0xFF, y*5&0xFF, y*13&0xFF, y*29&0xFF);
|
||
|
|
c.drawRect(r, p);
|
||
|
|
r.offset(0, SK_Scalar1);
|
||
|
|
}
|
||
|
|
SkIRect src;
|
||
|
|
SkRect dst;
|
||
|
|
|
||
|
|
static const int srcPts[] = {
|
||
|
|
// 2, 0, 15, 2,
|
||
|
|
2, 2, 15, 16,
|
||
|
|
17, 2, 2, 16,
|
||
|
|
19, 2, 1, 16,
|
||
|
|
// 2, 18, 15, 2
|
||
|
|
};
|
||
|
|
static const double dstPts[] = {
|
||
|
|
// 7, 262 15, 24.5,
|
||
|
|
7, 286.5, 15, 16,
|
||
|
|
22, 286.5, 5, 16,
|
||
|
|
27, 286.5, 1, 16,
|
||
|
|
// 7, 302.5, 15, 24.5
|
||
|
|
};
|
||
|
|
|
||
|
|
SkPaint p;
|
||
|
|
// p.setFilterBitmap(true);
|
||
|
|
const int* s = srcPts;
|
||
|
|
const double* d = dstPts;
|
||
|
|
for (int i = 0; i < 3; i++) {
|
||
|
|
src.set(s[0], s[1], s[0]+s[2], s[1]+s[3]);
|
||
|
|
dst.set(SkDoubleToScalar(d[0]),
|
||
|
|
SkDoubleToScalar(d[1]),
|
||
|
|
SkDoubleToScalar(d[0]+d[2]),
|
||
|
|
SkDoubleToScalar(d[1]+d[3]));
|
||
|
|
canvas->drawBitmapRect(bm, &src, dst, &p);
|
||
|
|
canvas->translate(SkDoubleToScalar(1), 0);
|
||
|
|
s += 4;
|
||
|
|
d += 4;
|
||
|
|
}
|
||
|
|
canvas->restore();
|
||
|
|
canvas->translate(SkIntToScalar(32), 0);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
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, 10, 10, &patch);
|
||
|
|
|
||
|
|
paint.setShader(NULL);
|
||
|
|
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);
|
||
|
|
patch.setBounds(fSize1.fX, fSize1.fY);
|
||
|
|
drawpatches(canvas, paint, 10, 10, &patch);
|
||
|
|
}
|
||
|
|
|
||
|
|
class PtClick : public Click {
|
||
|
|
public:
|
||
|
|
int fIndex;
|
||
|
|
PtClick(SkView* 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
|
||
|
|
for (int i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
|
||
|
|
if (hittest(fPts[i], x, y)) {
|
||
|
|
return new PtClick(this, i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return this->INHERITED::onFindClickHandler(x, y);
|
||
|
|
}
|
||
|
|
|
||
|
|
virtual bool onClick(Click* click) {
|
||
|
|
fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY);
|
||
|
|
this->inval(NULL);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
typedef SkView INHERITED;
|
||
|
|
};
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
static SkView* MyFactory() { return new PatchView; }
|
||
|
|
static SkViewRegister reg(MyFactory);
|
||
|
|
|