1 files changed, 273 insertions, 0 deletions
diff --git a/chromium/third_party/skia/samplecode/SampleHairline.cpp b/chromium/third_party/skia/samplecode/SampleHairline.cpp
new file mode 100644
index 00000000000..807a319e803
--- /dev/null
+++ b/chromium/third_party/skia/samplecode/SampleHairline.cpp
@@ -0,0 +1,273 @@
+/*
+ * 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 "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 test_chromium_9005() {
+    SkBitmap bm;
+    bm.allocN32Pixels(800, 600);
+
+    SkCanvas canvas(bm);
+
+    SkPoint pt0 = { 799.33374f, 1.2360189f };
+    SkPoint pt1 = { 808.49969f, -7.4338055f };
+
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    canvas.drawLine(pt0.fX, pt0.fY, pt1.fX, pt1.fY, paint);
+}
+
+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() {
+        fCounter = 0;
+        fProcIndex = 0;
+        fDoAA = true;
+        fNow = 0;
+    }
+
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        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, NULL);
+        canvas->drawBitmap(b1, SkIntToScalar(b0.width()), 0, NULL);
+    }
+
+    int fCounter;
+
+    virtual void onDrawContent(SkCanvas* canvas) {
+        gRand.setSeed(fNow);
+
+        if (false) { // avoid bit rot, suppress warning
+            test_chromium_9005();
+        }
+
+        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), NULL);
+
+        SkMSec now = SampleCode::GetAnimTime();
+        if (fNow != now) {
+            fNow = now;
+            fCounter += 1;
+            fDoAA = !fDoAA;
+            if (fCounter > 50) {
+                fProcIndex = cycle_hairproc_index(fProcIndex);
+                // todo: signal that we want to rebuild our TITLE
+                fCounter = 0;
+            }
+            this->inval(NULL);
+        }
+    }
+
+    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
+                                              unsigned modi) {
+        fDoAA = !fDoAA;
+        this->inval(NULL);
+        return this->INHERITED::onFindClickHandler(x, y, modi);
+    }
+
+
+private:
+    typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new HairlineView; }
+static SkViewRegister reg(MyFactory);