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      1 
      2 /*
      3  * Copyright 2011 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 #include "gm.h"
      9 #include "SkShader.h"
     10 #include "SkColorPriv.h"
     11 
     12 // effects
     13 #include "SkGradientShader.h"
     14 
     15 
     16 namespace skiagm {
     17 
     18 static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
     19     bm->setConfig(config, w, h);
     20     bm->allocPixels();
     21     bm->eraseColor(0);
     22 
     23     SkCanvas    canvas(*bm);
     24 
     25     SkScalar wScalar = SkIntToScalar(w);
     26     SkScalar hScalar = SkIntToScalar(h);
     27 
     28     SkPoint     pt = { wScalar / 2, hScalar / 2 };
     29 
     30     SkScalar    radius = 4 * SkMaxScalar(wScalar, hScalar);
     31 
     32     SkColor     colors[] = { SK_ColorRED, SK_ColorYELLOW,
     33                              SK_ColorGREEN, SK_ColorMAGENTA,
     34                              SK_ColorBLUE, SK_ColorCYAN,
     35                              SK_ColorRED};
     36 
     37     SkScalar    pos[] = {0,
     38                          SK_Scalar1 / 6,
     39                          2 * SK_Scalar1 / 6,
     40                          3 * SK_Scalar1 / 6,
     41                          4 * SK_Scalar1 / 6,
     42                          5 * SK_Scalar1 / 6,
     43                          SK_Scalar1};
     44 
     45     SkPaint     paint;
     46     paint.setShader(SkGradientShader::CreateRadial(
     47                     pt, radius,
     48                     colors, pos,
     49                     SK_ARRAY_COUNT(colors),
     50                     SkShader::kRepeat_TileMode))->unref();
     51     SkRect rect = SkRect::MakeWH(wScalar, hScalar);
     52     SkMatrix mat = SkMatrix::I();
     53     for (int i = 0; i < 4; ++i) {
     54         paint.getShader()->setLocalMatrix(mat);
     55         canvas.drawRect(rect, paint);
     56         rect.inset(wScalar / 8, hScalar / 8);
     57         mat.postScale(SK_Scalar1 / 4, SK_Scalar1 / 4);
     58     }
     59 }
     60 
     61 static const int gSize = 1024;
     62 
     63 class DrawBitmapRectGM : public GM {
     64 public:
     65     DrawBitmapRectGM() {
     66     }
     67 
     68     SkBitmap    fLargeBitmap;
     69 
     70 protected:
     71     SkString onShortName() {
     72         return SkString("drawbitmaprect");
     73     }
     74 
     75     SkISize onISize() { return make_isize(gSize, gSize); }
     76 
     77     virtual void onDraw(SkCanvas* canvas) {
     78         static const int kBmpSize = 2048;
     79         if (fLargeBitmap.isNull()) {
     80             makebm(&fLargeBitmap,
     81                    SkBitmap::kARGB_8888_Config,
     82                    kBmpSize, kBmpSize);
     83         }
     84         SkRect dstRect = { 0, 0, SkIntToScalar(64), SkIntToScalar(64)};
     85         static const int kMaxSrcRectSize = 1 << (SkNextLog2(kBmpSize) + 2);
     86 
     87         static const int kPadX = 30;
     88         static const int kPadY = 40;
     89         SkPaint paint;
     90         paint.setAlpha(0x20);
     91         canvas->drawBitmapRect(fLargeBitmap, NULL,
     92                                SkRect::MakeWH(gSize * SK_Scalar1,
     93                                               gSize * SK_Scalar1),
     94                                &paint);
     95         canvas->translate(SK_Scalar1 * kPadX / 2,
     96                           SK_Scalar1 * kPadY / 2);
     97         SkPaint blackPaint;
     98         SkScalar titleHeight = SK_Scalar1 * 24;
     99         blackPaint.setColor(SK_ColorBLACK);
    100         blackPaint.setTextSize(titleHeight);
    101         blackPaint.setAntiAlias(true);
    102         SkString title;
    103         title.printf("Bitmap size: %d x %d", kBmpSize, kBmpSize);
    104         canvas->drawText(title.c_str(), title.size(), 0,
    105                          titleHeight, blackPaint);
    106 
    107         canvas->translate(0, SK_Scalar1 * kPadY / 2  + titleHeight);
    108         int rowCount = 0;
    109         canvas->save();
    110         for (int w = 1; w <= kMaxSrcRectSize; w *= 4) {
    111             for (int h = 1; h <= kMaxSrcRectSize; h *= 4) {
    112 
    113                 SkIRect srcRect = SkIRect::MakeXYWH((kBmpSize - w) / 2,
    114                                                     (kBmpSize - h) / 2,
    115                                                     w, h);
    116                 canvas->drawBitmapRect(fLargeBitmap, &srcRect, dstRect);
    117 
    118                 SkString label;
    119                 label.appendf("%d x %d", w, h);
    120                 blackPaint.setAntiAlias(true);
    121                 blackPaint.setStyle(SkPaint::kFill_Style);
    122                 blackPaint.setTextSize(SK_Scalar1 * 10);
    123                 SkScalar baseline = dstRect.height() +
    124                                     blackPaint.getTextSize() + SK_Scalar1 * 3;
    125                 canvas->drawText(label.c_str(), label.size(),
    126                                     0, baseline,
    127                                     blackPaint);
    128                 blackPaint.setStyle(SkPaint::kStroke_Style);
    129                 blackPaint.setStrokeWidth(SK_Scalar1);
    130                 blackPaint.setAntiAlias(false);
    131                 canvas->drawRect(dstRect, blackPaint);
    132 
    133                 canvas->translate(dstRect.width() + SK_Scalar1 * kPadX, 0);
    134                 ++rowCount;
    135                 if ((dstRect.width() + kPadX) * rowCount > gSize) {
    136                     canvas->restore();
    137                     canvas->translate(0, dstRect.height() + SK_Scalar1 * kPadY);
    138                     canvas->save();
    139                     rowCount = 0;
    140                 }
    141             }
    142         }
    143     }
    144 
    145 private:
    146     typedef GM INHERITED;
    147 };
    148 
    149 //////////////////////////////////////////////////////////////////////////////
    150 
    151 static GM* MyFactory(void*) { return new DrawBitmapRectGM; }
    152 static GMRegistry reg(MyFactory);
    153 
    154 }
    155 
    156