/*
* 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 "SkAnimTimer.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkCornerPathEffect.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 "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkXfermode.h"
#include "SkStream.h"
#include "SkXMLParser.h"
#include "SkColorPriv.h"
#include "SkImageDecoder.h"
static SkRandom gRand;
static void generate_pts(SkPoint pts[], int count, int w, int h) {
for (int i = 0; i < count; i++) {
pts[i].set(gRand.nextUScalar1() * 3 * w - SkIntToScalar(w),
gRand.nextUScalar1() * 3 * h - SkIntToScalar(h));
}
}
static bool check_zeros(const SkPMColor pixels[], int count, int skip) {
for (int i = 0; i < count; i++) {
if (*pixels) {
return false;
}
pixels += skip;
}
return true;
}
static bool check_bitmap_margin(const SkBitmap& bm, int margin) {
size_t rb = bm.rowBytes();
for (int i = 0; i < margin; i++) {
if (!check_zeros(bm.getAddr32(0, i), bm.width(), 1)) {
return false;
}
int bottom = bm.height() - i - 1;
if (!check_zeros(bm.getAddr32(0, bottom), bm.width(), 1)) {
return false;
}
// left column
if (!check_zeros(bm.getAddr32(i, 0), bm.height(), SkToInt(rb >> 2))) {
return false;
}
int right = bm.width() - margin + i;
if (!check_zeros(bm.getAddr32(right, 0), bm.height(),
SkToInt(rb >> 2))) {
return false;
}
}
return true;
}
#define WIDTH 620
#define HEIGHT 460
#define MARGIN 10
static void line_proc(SkCanvas* canvas, const SkPaint& paint,
const SkBitmap& bm) {
const int N = 2;
SkPoint pts[N];
for (int i = 0; i < 400; i++) {
generate_pts(pts, N, WIDTH, HEIGHT);
canvas->drawLine(pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY, paint);
if (!check_bitmap_margin(bm, MARGIN)) {
SkDebugf("---- hairline failure (%g %g) (%g %g)\n",
pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY);
break;
}
}
}
static void poly_proc(SkCanvas* canvas, const SkPaint& paint,
const SkBitmap& bm) {
const int N = 8;
SkPoint pts[N];
for (int i = 0; i < 50; i++) {
generate_pts(pts, N, WIDTH, HEIGHT);
SkPath path;
path.moveTo(pts[0]);
for (int j = 1; j < N; j++) {
path.lineTo(pts[j]);
}
canvas->drawPath(path, paint);
}
}
static SkPoint ave(const SkPoint& a, const SkPoint& b) {
SkPoint c = a + b;
c.fX = SkScalarHalf(c.fX);
c.fY = SkScalarHalf(c.fY);
return c;
}
static void quad_proc(SkCanvas* canvas, const SkPaint& paint,
const SkBitmap& bm) {
const int N = 30;
SkPoint pts[N];
for (int i = 0; i < 10; i++) {
generate_pts(pts, N, WIDTH, HEIGHT);
SkPath path;
path.moveTo(pts[0]);
for (int j = 1; j < N - 2; j++) {
path.quadTo(pts[j], ave(pts[j], pts[j+1]));
}
path.quadTo(pts[N - 2], pts[N - 1]);
canvas->drawPath(path, paint);
}
}
static void add_cubic(SkPath* path, const SkPoint& mid, const SkPoint& end) {
SkPoint start;
path->getLastPt(&start);
path->cubicTo(ave(start, mid), ave(mid, end), end);
}
static void cube_proc(SkCanvas* canvas, const SkPaint& paint,
const SkBitmap& bm) {
const int N = 30;
SkPoint pts[N];
for (int i = 0; i < 10; i++) {
generate_pts(pts, N, WIDTH, HEIGHT);
SkPath path;
path.moveTo(pts[0]);
for (int j = 1; j < N - 2; j++) {
add_cubic(&path, pts[j], ave(pts[j], pts[j+1]));
}
add_cubic(&path, pts[N - 2], pts[N - 1]);
canvas->drawPath(path, paint);
}
}
typedef void (*HairProc)(SkCanvas*, const SkPaint&, const SkBitmap&);
static const struct {
const char* fName;
HairProc fProc;
} gProcs[] = {
{ "line", line_proc },
{ "poly", poly_proc },
{ "quad", quad_proc },
{ "cube", cube_proc },
};
static int cycle_hairproc_index(int index) {
return (index + 1) % SK_ARRAY_COUNT(gProcs);
}
class HairlineView : public SampleView {
SkMSec fNow;
int fProcIndex;
bool fDoAA;
public:
HairlineView() {
fProcIndex = 0;
fDoAA = true;
fNow = 0;
}
protected:
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SkString str;
str.printf("Hair-%s", gProcs[fProcIndex].fName);
SampleCode::TitleR(evt, str.c_str());
return true;
}
return this->INHERITED::onQuery(evt);
}
void show_bitmaps(SkCanvas* canvas, const SkBitmap& b0, const SkBitmap& b1,
const SkIRect& inset) {
canvas->drawBitmap(b0, 0, 0, nullptr);
canvas->drawBitmap(b1, SkIntToScalar(b0.width()), 0, nullptr);
}
void onDrawContent(SkCanvas* canvas) override {
gRand.setSeed(fNow);
SkBitmap bm, bm2;
bm.allocN32Pixels(WIDTH + MARGIN*2, HEIGHT + MARGIN*2);
// this will erase our margin, which we want to always stay 0
bm.eraseColor(SK_ColorTRANSPARENT);
bm2.installPixels(SkImageInfo::MakeN32Premul(WIDTH, HEIGHT),
bm.getAddr32(MARGIN, MARGIN), bm.rowBytes());
SkCanvas c2(bm2);
SkPaint paint;
paint.setAntiAlias(fDoAA);
paint.setStyle(SkPaint::kStroke_Style);
bm2.eraseColor(SK_ColorTRANSPARENT);
gProcs[fProcIndex].fProc(&c2, paint, bm);
canvas->drawBitmap(bm2, SkIntToScalar(10), SkIntToScalar(10), nullptr);
}
bool onAnimate(const SkAnimTimer&) override {
if (fDoAA) {
fProcIndex = cycle_hairproc_index(fProcIndex);
// todo: signal that we want to rebuild our TITLE
}
fDoAA = !fDoAA;
return true;
}
SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
fDoAA = !fDoAA;
this->inval(nullptr);
return this->INHERITED::onFindClickHandler(x, y, modi);
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new HairlineView; }
static SkViewRegister reg(MyFactory);