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