419 lines
13 KiB
C++
419 lines
13 KiB
C++
#include "SampleCode.h"
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#include "SkView.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 "SkImageDecoder.h"
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#include "SkPath.h"
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#include "SkPorterDuff.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 "SkUtils.h"
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#include "SkXfermode.h"
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#include "SkShaderExtras.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 "SkImageRef.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 void drawtriangle(SkCanvas* canvas, const SkPaint& paint,
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const SkPoint pts[3]) {
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SkPath path;
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path.moveTo(pts[0]);
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path.lineTo(pts[1]);
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path.lineTo(pts[2]);
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canvas->drawPath(path, paint);
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}
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static SkShader* make_shader0(SkIPoint* size) {
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SkBitmap bm;
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// SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm);
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SkImageDecoder::DecodeFile("/skimages/beach.jpg", &bm);
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size->set(bm.width(), bm.height());
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return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode,
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SkShader::kClamp_TileMode);
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}
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static SkShader* make_shader1(const SkIPoint& size) {
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SkPoint pts[] = { 0, 0, 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::CreateLinear(pts, colors, NULL,
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SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode, NULL);
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}
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///////////////////////////////////////////////////////////////////////////////
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class Patch {
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public:
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Patch() { 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], NULL, NULL);
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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 = SkScalarMul(u, v);
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SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v);
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SkScalar uV = SkScalarMul(u, SK_Scalar1 - v);
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SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v);
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SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) +
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SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX);
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SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) +
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SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY);
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SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) +
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SkScalarMul(u, edge[TR+iv].fX) +
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SkScalarMul(v, edge[BR+nu-iu].fX) +
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SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0;
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SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) +
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SkScalarMul(u, edge[TR+iv].fY) +
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SkScalarMul(v, edge[BR+nu-iu].fY) +
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SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0;
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pt->set(x, y);
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}
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static int ScalarTo255(SkScalar v) {
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int scale = SkScalarToFixed(v) >> 8;
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if (scale < 0) {
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scale = 0;
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} else if (scale > 255) {
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scale = 255;
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}
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return scale;
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}
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static SkColor make_color(SkScalar s, SkScalar t) {
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int cs = ScalarTo255(s);
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int ct = ScalarTo255(t);
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return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 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(SkCanvas::kTriangleStrip_VertexMode, stripCount,
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strip, doTextures ? tex : NULL,
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doColors ? colors : NULL, NULL,
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NULL, 0, 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, 10, 10, false, false);
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canvas->translate(SkIntToScalar(300), 0);
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patch->draw(canvas, paint, 10, 10, true, false);
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canvas->translate(SkIntToScalar(300), 0);
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patch->draw(canvas, paint, 10, 10, false, true);
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canvas->translate(SkIntToScalar(300), 0);
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patch->draw(canvas, paint, 10, 10, true, true);
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}
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class PatchView : public SkView {
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SkShader* fShader0;
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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() {
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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(90);
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const SkScalar T = SkIntToScalar(64);
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fPts[0].set(S*1, T);
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fPts[1].set(S*2, T);
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fPts[2].set(S*3, T);
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fPts[3].set(S*4, T);
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fPts[4].set(S*4, T*2);
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fPts[5].set(S*4, T*3);
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fPts[6].set(S*4, T*4);
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fPts[7].set(S*3, T*4);
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fPts[8].set(S*2, T*4);
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fPts[9].set(S*1, T*4);
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fPts[10].set(S*1, T*3);
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fPts[11].set(S*1, T*2);
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}
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virtual ~PatchView() {
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fShader0->safeUnref();
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fShader1->safeUnref();
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt))
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{
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SkString str("Patch");
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SampleCode::TitleR(evt, str.c_str());
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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 drawBG(SkCanvas* canvas) {
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canvas->drawColor(SK_ColorGRAY);
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(canvas);
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SkPaint paint;
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paint.setDither(true);
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paint.setFilterBitmap(true);
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if (false) {
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SkPath p;
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p.moveTo(0, 0);
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p.lineTo(SkIntToScalar(30000), SkIntToScalar(30000));
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(4));
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paint.setAntiAlias(true);
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canvas->scale(SkIntToScalar(3), SkIntToScalar(3));
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canvas->drawPath(p, paint);
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return;
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}
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if (false) {
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for (int dy = -1; dy <= 2; dy++) {
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canvas->save();
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if (dy == 2) {
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canvas->translate(0, SK_Scalar1/2);
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} else {
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canvas->translate(0, SkIntToScalar(dy)/100);
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}
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SkBitmap bm;
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bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
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bm.allocPixels();
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SkCanvas c(bm);
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SkRect r = { 0, 0, 20*SK_Scalar1, SK_Scalar1 };
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for (int y = 0; y < 20; y++) {
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SkPaint p;
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p.setARGB(0xFF, y*5&0xFF, y*13&0xFF, y*29&0xFF);
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c.drawRect(r, p);
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r.offset(0, SK_Scalar1);
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}
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SkIRect src;
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SkRect dst;
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static const int srcPts[] = {
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// 2, 0, 15, 2,
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2, 2, 15, 16,
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17, 2, 2, 16,
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19, 2, 1, 16,
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// 2, 18, 15, 2
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};
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static const double dstPts[] = {
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// 7, 262 15, 24.5,
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7, 286.5, 15, 16,
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22, 286.5, 5, 16,
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27, 286.5, 1, 16,
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// 7, 302.5, 15, 24.5
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};
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SkPaint p;
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// p.setFilterBitmap(true);
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const int* s = srcPts;
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const double* d = dstPts;
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for (int i = 0; i < 3; i++) {
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src.set(s[0], s[1], s[0]+s[2], s[1]+s[3]);
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dst.set(SkDoubleToScalar(d[0]),
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SkDoubleToScalar(d[1]),
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SkDoubleToScalar(d[0]+d[2]),
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SkDoubleToScalar(d[1]+d[3]));
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canvas->drawBitmapRect(bm, &src, dst, &p);
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canvas->translate(SkDoubleToScalar(1), 0);
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s += 4;
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d += 4;
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(32), 0);
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}
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return;
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}
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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, 10, 10, &patch);
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paint.setShader(NULL);
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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),
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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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patch.setBounds(fSize1.fX, fSize1.fY);
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drawpatches(canvas, paint, 10, 10, &patch);
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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(SkView* 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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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
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for (int 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, i);
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}
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}
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return this->INHERITED::onFindClickHandler(x, y);
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}
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virtual bool onClick(Click* click) {
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fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY);
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this->inval(NULL);
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return true;
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}
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private:
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typedef SkView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new PatchView; }
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static SkViewRegister reg(MyFactory);
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