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skia2/samplecode/SamplePatch.cpp
caryclark@google.com 02939ce4bd fix warnings on Mac in ssamplecode 
Fix these class of warnings:
- unused functions
- unused locals
- sign mismatch
- missing function prototypes
- missing newline at end of file
- 64 to 32 bit truncation

The changes prefer to link in dead code in the debug build
with 'if (false)' than to comment it out, but trivial cases
are commented out or sometimes deleted if it appears to be
a copy/paste error.
Review URL: https://codereview.appspot.com/6301044

git-svn-id: http://skia.googlecode.com/svn/trunk@4183 2bbb7eff-a529-9590-31e7-b0007b416f81
2012-06-06 12:09:51 +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 "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkPath.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 SkShader* make_shader0(SkIPoint* size) {
SkBitmap bm;
// SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm);
SkImageDecoder::DecodeFile("/skimages/logo.png", &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() { 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], 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(180), 0);
patch->draw(canvas, paint, 10, 10, true, false);
canvas->translate(SkIntToScalar(180), 0);
patch->draw(canvas, paint, 10, 10, false, true);
canvas->translate(SkIntToScalar(180), 0);
patch->draw(canvas, paint, 10, 10, true, true);
}
class PatchView : public SampleView {
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(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);
}
virtual ~PatchView() {
SkSafeUnref(fShader0);
SkSafeUnref(fShader1);
}
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);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPaint paint;
paint.setDither(true);
paint.setFilterBitmap(true);
canvas->translate(SkIntToScalar(20), 0);
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 (size_t 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 SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new PatchView; }
static SkViewRegister reg(MyFactory);
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