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333 lines
9.8 KiB
333 lines
9.8 KiB
/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "DecodeFile.h"
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#include "Sample.h"
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#include "SkAnimTimer.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkGraphics.h"
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#include "SkPath.h"
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#include "SkRandom.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkUTF.h"
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#include "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkTime.h"
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#include "SkTypeface.h"
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#include "SkVertices.h"
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#include "SkOSFile.h"
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#include "SkStream.h"
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#include "SkGeometry.h" // private include :(
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static sk_sp<SkShader> make_shader0(SkIPoint* size) {
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SkBitmap bm;
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// decode_file("/skimages/progressivejpg.jpg", &bm);
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decode_file("/skimages/logo.png", &bm);
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size->set(bm.width(), bm.height());
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return SkShader::MakeBitmapShader(bm, SkShader::kClamp_TileMode,
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SkShader::kClamp_TileMode);
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}
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static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
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SkPoint pts[] = { { 0, 0, },
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{ SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
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SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
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return SkGradientShader::MakeLinear(pts, colors, nullptr,
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SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode);
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}
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///////////////////////////////////////////////////////////////////////////////
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class Patch {
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public:
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Patch() { sk_bzero(fPts, sizeof(fPts)); }
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~Patch() {}
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void setPatch(const SkPoint pts[12]) {
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memcpy(fPts, pts, 12 * sizeof(SkPoint));
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fPts[12] = pts[0]; // the last shall be first
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}
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void setBounds(int w, int h) { fW = w; fH = h; }
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void draw(SkCanvas*, const SkPaint&, int segsU, int segsV,
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bool doTextures, bool doColors);
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private:
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SkPoint fPts[13];
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int fW, fH;
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};
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static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) {
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SkScalar t = 0;
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SkScalar dt = SK_Scalar1 / segs;
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samples[0] = cubic[0];
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for (int i = 1; i < segs; i++) {
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t += dt;
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SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr);
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}
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}
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static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv,
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SkPoint* pt) {
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const int TL = 0;
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const int TR = nu;
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const int BR = TR + nv;
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const int BL = BR + nu;
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SkScalar u = SkIntToScalar(iu) / nu;
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SkScalar v = SkIntToScalar(iv) / nv;
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SkScalar uv = u * v;
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SkScalar Uv = (1 - u) * v;
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SkScalar uV = u * (1 - v);
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SkScalar UV = (1 - u) * (1 - v);
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SkScalar x0 = UV * edge[TL].fX + uV * edge[TR].fX + Uv * edge[BL].fX + uv * edge[BR].fX;
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SkScalar y0 = UV * edge[TL].fY + uV * edge[TR].fY + Uv * edge[BL].fY + uv * edge[BR].fY;
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SkScalar x = (1 - v) * edge[TL+iu].fX + u * edge[TR+iv].fX +
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v * edge[BR+nu-iu].fX + (1 - u) * edge[BL+nv-iv].fX - x0;
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SkScalar y = (1 - v) * edge[TL+iu].fY + u * edge[TR+iv].fY +
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v * edge[BR+nu-iu].fY + (1 - u) * edge[BL+nv-iv].fY - y0;
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pt->set(x, y);
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}
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static SkColor make_color(SkScalar s, SkScalar t) {
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return SkColorSetARGB(0xFF, SkUnitScalarClampToByte(s), SkUnitScalarClampToByte(t), 0);
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}
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void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
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bool doTextures, bool doColors) {
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if (nu < 1 || nv < 1) {
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return;
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}
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int i, npts = (nu + nv) * 2;
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SkAutoSTMalloc<16, SkPoint> storage(npts + 1);
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SkPoint* edge0 = storage.get();
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SkPoint* edge1 = edge0 + nu;
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SkPoint* edge2 = edge1 + nv;
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SkPoint* edge3 = edge2 + nu;
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// evaluate the edge points
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eval_patch_edge(fPts + 0, edge0, nu);
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eval_patch_edge(fPts + 3, edge1, nv);
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eval_patch_edge(fPts + 6, edge2, nu);
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eval_patch_edge(fPts + 9, edge3, nv);
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edge3[nv] = edge0[0]; // the last shall be first
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for (i = 0; i < npts; i++) {
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// canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint);
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}
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int row, vertCount = (nu + 1) * (nv + 1);
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SkAutoTMalloc<SkPoint> vertStorage(vertCount);
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SkPoint* verts = vertStorage.get();
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// first row
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memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint));
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// rows
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SkPoint* r = verts;
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for (row = 1; row < nv; row++) {
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r += nu + 1;
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r[0] = edge3[nv - row];
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for (int col = 1; col < nu; col++) {
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eval_sheet(edge0, nu, nv, col, row, &r[col]);
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}
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r[nu] = edge1[row];
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}
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// last row
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SkPoint* last = verts + nv * (nu + 1);
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for (i = 0; i <= nu; i++) {
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last[i] = edge2[nu - i];
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}
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// canvas->drawPoints(verts, vertCount, paint);
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int stripCount = (nu + 1) * 2;
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SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2);
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SkAutoTMalloc<SkColor> colorStorage(stripCount);
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SkPoint* strip = stripStorage.get();
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SkPoint* tex = strip + stripCount;
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SkColor* colors = colorStorage.get();
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SkScalar t = 0;
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const SkScalar ds = SK_Scalar1 * fW / nu;
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const SkScalar dt = SK_Scalar1 * fH / nv;
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r = verts;
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for (row = 0; row < nv; row++) {
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SkPoint* upper = r;
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SkPoint* lower = r + nu + 1;
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r = lower;
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SkScalar s = 0;
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for (i = 0; i <= nu; i++) {
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strip[i*2 + 0] = *upper++;
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strip[i*2 + 1] = *lower++;
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tex[i*2 + 0].set(s, t);
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tex[i*2 + 1].set(s, t + dt);
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colors[i*2 + 0] = make_color(s/fW, t/fH);
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colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH);
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s += ds;
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}
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t += dt;
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canvas->drawVertices(SkVertices::MakeCopy(SkVertices::kTriangleStrip_VertexMode, stripCount,
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strip, doTextures ? tex : nullptr,
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doColors ? colors : nullptr),
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SkBlendMode::kModulate, paint);
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}
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}
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static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv,
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Patch* patch) {
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SkAutoCanvasRestore ar(canvas, true);
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patch->draw(canvas, paint, nu, nv, false, false);
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canvas->translate(SkIntToScalar(180), 0);
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patch->draw(canvas, paint, nu, nv, true, false);
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canvas->translate(SkIntToScalar(180), 0);
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patch->draw(canvas, paint, nu, nv, false, true);
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canvas->translate(SkIntToScalar(180), 0);
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patch->draw(canvas, paint, nu, nv, true, true);
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}
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const SkScalar DX = 20;
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const SkScalar DY = 0;
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class PatchView : public Sample {
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SkScalar fAngle;
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sk_sp<SkShader> fShader0;
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sk_sp<SkShader> fShader1;
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SkIPoint fSize0, fSize1;
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SkPoint fPts[12];
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public:
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PatchView() : fAngle(0) {
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fShader0 = make_shader0(&fSize0);
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fSize1 = fSize0;
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if (fSize0.fX == 0 || fSize0.fY == 0) {
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fSize1.set(2, 2);
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}
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fShader1 = make_shader1(fSize1);
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const SkScalar S = SkIntToScalar(50);
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const SkScalar T = SkIntToScalar(40);
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fPts[0].set(S*0, T);
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fPts[1].set(S*1, T);
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fPts[2].set(S*2, T);
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fPts[3].set(S*3, T);
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fPts[4].set(S*3, T*2);
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fPts[5].set(S*3, T*3);
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fPts[6].set(S*3, T*4);
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fPts[7].set(S*2, T*4);
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fPts[8].set(S*1, T*4);
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fPts[9].set(S*0, T*4);
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fPts[10].set(S*0, T*3);
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fPts[11].set(S*0, T*2);
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this->setBGColor(SK_ColorGRAY);
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}
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protected:
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bool onQuery(Sample::Event* evt) override {
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if (Sample::TitleQ(*evt)) {
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Sample::TitleR(evt, "Patch");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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void onDrawContent(SkCanvas* canvas) override {
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const int nu = 10;
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const int nv = 10;
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SkPaint paint;
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paint.setDither(true);
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paint.setFilterQuality(kLow_SkFilterQuality);
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canvas->translate(DX, DY);
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Patch patch;
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paint.setShader(fShader0);
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if (fSize0.fX == 0) {
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fSize0.fX = 1;
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}
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if (fSize0.fY == 0) {
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fSize0.fY = 1;
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}
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patch.setBounds(fSize0.fX, fSize0.fY);
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patch.setPatch(fPts);
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drawpatches(canvas, paint, nu, nv, &patch);
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paint.setShader(nullptr);
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paint.setAntiAlias(true);
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paint.setStrokeWidth(SkIntToScalar(5));
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canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint);
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canvas->translate(0, SkIntToScalar(300));
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paint.setAntiAlias(false);
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paint.setShader(fShader1);
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if (true) {
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SkMatrix m;
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m.setSkew(1, 0);
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paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
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}
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if (true) {
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SkMatrix m;
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m.setRotate(fAngle);
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paint.setShader(paint.getShader()->makeWithLocalMatrix(m));
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}
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patch.setBounds(fSize1.fX, fSize1.fY);
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drawpatches(canvas, paint, nu, nv, &patch);
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}
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bool onAnimate(const SkAnimTimer& timer) override {
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fAngle = timer.scaled(60, 360);
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return true;
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}
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class PtClick : public Click {
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public:
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int fIndex;
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PtClick(Sample* view, int index) : Click(view), fIndex(index) {}
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};
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static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) {
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return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5);
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}
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Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
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x -= DX;
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y -= DY;
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for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) {
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if (hittest(fPts[i], x, y)) {
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return new PtClick(this, (int)i);
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}
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}
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return this->INHERITED::onFindClickHandler(x, y, modi);
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}
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bool onClick(Click* click) override {
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fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY);
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return true;
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}
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private:
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typedef Sample INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SAMPLE( return new PatchView(); )
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