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      1 
      2 /*
      3  * Copyright 2014 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include "gm.h"
     10 
     11 #include "SkBitmap.h"
     12 #include "SkGradientShader.h"
     13 #include "SkTLList.h"
     14 
     15 static SkBitmap make_bmp(int w, int h) {
     16     SkBitmap bmp;
     17     bmp.allocN32Pixels(w, h, true);
     18 
     19     SkCanvas canvas(bmp);
     20     SkScalar wScalar = SkIntToScalar(w);
     21     SkScalar hScalar = SkIntToScalar(h);
     22 
     23     SkPoint     pt = { wScalar / 2, hScalar / 2 };
     24 
     25     SkScalar    radius = 3 * SkMaxScalar(wScalar, hScalar);
     26 
     27     SkColor     colors[] = { SK_ColorDKGRAY, 0xFF222255,
     28                              0xFF331133, 0xFF884422,
     29                              0xFF000022, SK_ColorWHITE,
     30                              0xFFAABBCC};
     31 
     32     SkScalar    pos[] = {0,
     33                          SK_Scalar1 / 6,
     34                          2 * SK_Scalar1 / 6,
     35                          3 * SK_Scalar1 / 6,
     36                          4 * SK_Scalar1 / 6,
     37                          5 * SK_Scalar1 / 6,
     38                          SK_Scalar1};
     39 
     40     SkPaint paint;
     41     SkRect rect = SkRect::MakeWH(wScalar, hScalar);
     42     SkMatrix mat = SkMatrix::I();
     43     for (int i = 0; i < 4; ++i) {
     44         paint.setShader(SkGradientShader::CreateRadial(
     45                         pt, radius,
     46                         colors, pos,
     47                         SK_ARRAY_COUNT(colors),
     48                         SkShader::kRepeat_TileMode,
     49                         0, &mat))->unref();
     50         canvas.drawRect(rect, paint);
     51         rect.inset(wScalar / 8, hScalar / 8);
     52         mat.preTranslate(6 * wScalar, 6 * hScalar);
     53         mat.postScale(SK_Scalar1 / 3, SK_Scalar1 / 3);
     54     }
     55 
     56     paint.setAntiAlias(true);
     57     sk_tool_utils::set_portable_typeface(&paint);
     58     paint.setTextSize(wScalar / 2.2f);
     59     paint.setShader(0);
     60     paint.setColor(SK_ColorLTGRAY);
     61     static const char kTxt[] = "Skia";
     62     SkPoint texPos = { wScalar / 17, hScalar / 2 + paint.getTextSize() / 2.5f };
     63     canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
     64     paint.setColor(SK_ColorBLACK);
     65     paint.setStyle(SkPaint::kStroke_Style);
     66     paint.setStrokeWidth(SK_Scalar1);
     67     canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
     68     return bmp;
     69 }
     70 
     71 namespace skiagm {
     72 /**
     73  * This GM tests convex polygon clips.
     74  */
     75 class ConvexPolyClip : public GM {
     76 public:
     77     ConvexPolyClip() {
     78         this->setBGColor(0xFFFFFFFF);
     79     }
     80 
     81 protected:
     82     virtual SkString onShortName() SK_OVERRIDE {
     83         return SkString("convex_poly_clip");
     84     }
     85 
     86     virtual SkISize onISize() SK_OVERRIDE {
     87         // When benchmarking the saveLayer set of draws is skipped.
     88         int w = 435;
     89         if (kBench_Mode != this->getMode()) {
     90             w *= 2;
     91         }
     92         return SkISize::Make(w, 540);
     93     }
     94 
     95     virtual void onOnceBeforeDraw() SK_OVERRIDE {
     96         SkPath tri;
     97         tri.moveTo(5.f, 5.f);
     98         tri.lineTo(100.f, 20.f);
     99         tri.lineTo(15.f, 100.f);
    100 
    101         fClips.addToTail()->setPath(tri);
    102 
    103         SkPath hexagon;
    104         static const SkScalar kRadius = 45.f;
    105         const SkPoint center = { kRadius, kRadius };
    106         for (int i = 0; i < 6; ++i) {
    107             SkScalar angle = 2 * SK_ScalarPI * i / 6;
    108             SkPoint point;
    109             point.fY = SkScalarSinCos(angle, &point.fX);
    110             point.scale(kRadius);
    111             point = center + point;
    112             if (0 == i) {
    113                 hexagon.moveTo(point);
    114             } else {
    115                 hexagon.lineTo(point);
    116             }
    117         }
    118         fClips.addToTail()->setPath(hexagon);
    119 
    120         SkMatrix scaleM;
    121         scaleM.setScale(1.1f, 0.4f, kRadius, kRadius);
    122         hexagon.transform(scaleM);
    123         fClips.addToTail()->setPath(hexagon);
    124 
    125         fClips.addToTail()->setRect(SkRect::MakeXYWH(8.3f, 11.6f, 78.2f, 72.6f));
    126 
    127         SkPath rotRect;
    128         SkRect rect = SkRect::MakeLTRB(10.f, 12.f, 80.f, 86.f);
    129         rotRect.addRect(rect);
    130         SkMatrix rotM;
    131         rotM.setRotate(23.f, rect.centerX(), rect.centerY());
    132         rotRect.transform(rotM);
    133         fClips.addToTail()->setPath(rotRect);
    134 
    135         fBmp = make_bmp(100, 100);
    136     }
    137 
    138     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
    139         SkScalar y = 0;
    140         static const SkScalar kMargin = 10.f;
    141 
    142         SkPaint bgPaint;
    143         bgPaint.setAlpha(0x15);
    144         SkISize size = canvas->getDeviceSize();
    145         SkRect dstRect = SkRect::MakeWH(SkIntToScalar(size.fWidth),
    146                                         SkIntToScalar(size.fHeight));
    147         canvas->drawBitmapRectToRect(fBmp, NULL, dstRect, &bgPaint);
    148 
    149         static const char kTxt[] = "Clip Me!";
    150         SkPaint txtPaint;
    151         txtPaint.setTextSize(23.f);
    152         txtPaint.setAntiAlias(true);
    153         sk_tool_utils::set_portable_typeface(&txtPaint);
    154         txtPaint.setColor(SK_ColorDKGRAY);
    155         SkScalar textW = txtPaint.measureText(kTxt, SK_ARRAY_COUNT(kTxt)-1);
    156 
    157         SkScalar startX = 0;
    158         int testLayers = kBench_Mode != this->getMode();
    159         for (int doLayer = 0; doLayer <= testLayers; ++doLayer) {
    160             for (SkTLList<Clip>::Iter iter(fClips, SkTLList<Clip>::Iter::kHead_IterStart);
    161                  iter.get();
    162                  iter.next()) {
    163                 const Clip* clip = iter.get();
    164                 SkScalar x = startX;
    165                 for (int aa = 0; aa < 2; ++aa) {
    166                     if (doLayer) {
    167                         SkRect bounds;
    168                         clip->getBounds(&bounds);
    169                         bounds.outset(2, 2);
    170                         bounds.offset(x, y);
    171                         canvas->saveLayer(&bounds, NULL);
    172                     } else {
    173                         canvas->save();
    174                     }
    175                     canvas->translate(x, y);
    176                     clip->setOnCanvas(canvas, SkRegion::kIntersect_Op, SkToBool(aa));
    177                     canvas->drawBitmap(fBmp, 0, 0);
    178                     canvas->restore();
    179                     x += fBmp.width() + kMargin;
    180                 }
    181                 for (int aa = 0; aa < 2; ++aa) {
    182 
    183                     SkPaint clipOutlinePaint;
    184                     clipOutlinePaint.setAntiAlias(true);
    185                     clipOutlinePaint.setColor(0x50505050);
    186                     clipOutlinePaint.setStyle(SkPaint::kStroke_Style);
    187                     clipOutlinePaint.setStrokeWidth(0);
    188 
    189                     if (doLayer) {
    190                         SkRect bounds;
    191                         clip->getBounds(&bounds);
    192                         bounds.outset(2, 2);
    193                         bounds.offset(x, y);
    194                         canvas->saveLayer(&bounds, NULL);
    195                     } else {
    196                         canvas->save();
    197                     }
    198                     canvas->translate(x, y);
    199                     SkPath closedClipPath;
    200                     clip->asClosedPath(&closedClipPath);
    201                     canvas->drawPath(closedClipPath, clipOutlinePaint);
    202                     clip->setOnCanvas(canvas, SkRegion::kIntersect_Op, SkToBool(aa));
    203                     canvas->scale(1.f, 1.8f);
    204                     canvas->drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1,
    205                                      0, 1.5f * txtPaint.getTextSize(),
    206                                      txtPaint);
    207                     canvas->restore();
    208                     x += textW + 2 * kMargin;
    209                 }
    210                 y += fBmp.height() + kMargin;
    211             }
    212             y = 0;
    213             startX += 2 * fBmp.width() + SkScalarCeilToInt(2 * textW) + 6 * kMargin;
    214         }
    215     }
    216 
    217     virtual uint32_t onGetFlags() const {
    218         return kAsBench_Flag | kSkipTiled_Flag;
    219     }
    220 
    221 private:
    222     class Clip {
    223     public:
    224         enum ClipType {
    225             kNone_ClipType,
    226             kPath_ClipType,
    227             kRect_ClipType
    228         };
    229 
    230         Clip () : fClipType(kNone_ClipType) {}
    231 
    232         void setOnCanvas(SkCanvas* canvas, SkRegion::Op op, bool aa) const {
    233             switch (fClipType) {
    234                 case kPath_ClipType:
    235                     canvas->clipPath(fPath, op, aa);
    236                     break;
    237                 case kRect_ClipType:
    238                     canvas->clipRect(fRect, op, aa);
    239                     break;
    240                 case kNone_ClipType:
    241                     SkDEBUGFAIL("Uninitialized Clip.");
    242                     break;
    243             }
    244         }
    245 
    246         void asClosedPath(SkPath* path) const {
    247             switch (fClipType) {
    248                 case kPath_ClipType:
    249                     *path = fPath;
    250                     path->close();
    251                     break;
    252                 case kRect_ClipType:
    253                     path->reset();
    254                     path->addRect(fRect);
    255                     break;
    256                 case kNone_ClipType:
    257                     SkDEBUGFAIL("Uninitialized Clip.");
    258                     break;
    259             }
    260         }
    261 
    262         void setPath(const SkPath& path) {
    263             fClipType = kPath_ClipType;
    264             fPath = path;
    265         }
    266 
    267         void setRect(const SkRect& rect) {
    268             fClipType = kRect_ClipType;
    269             fRect = rect;
    270             fPath.reset();
    271         }
    272 
    273         ClipType getType() const { return fClipType; }
    274 
    275         void getBounds(SkRect* bounds) const {
    276             switch (fClipType) {
    277                 case kPath_ClipType:
    278                     *bounds = fPath.getBounds();
    279                     break;
    280                 case kRect_ClipType:
    281                     *bounds = fRect;
    282                     break;
    283                 case kNone_ClipType:
    284                     SkDEBUGFAIL("Uninitialized Clip.");
    285                     break;
    286             }
    287         }
    288 
    289     private:
    290         ClipType fClipType;
    291         SkPath fPath;
    292         SkRect fRect;
    293     };
    294 
    295     SkTLList<Clip>   fClips;
    296     SkBitmap         fBmp;
    297 
    298     typedef GM INHERITED;
    299 };
    300 
    301 DEF_GM( return SkNEW(ConvexPolyClip); )
    302 
    303 }
    304