gm/spritebitmap.cpp

   1 /*
   2  * Copyright 2013 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "gm.h"
   9 #include "SkCanvas.h"
  10 #include "SkBlurImageFilter.h"
  11
  12 static void make_bm(SkBitmap* bm) {
  13     bm->allocN32Pixels(100, 100);
  14     bm->eraseColor(SK_ColorBLUE);
  15
  16     SkCanvas canvas(*bm);
  17     SkPaint paint;
  18     paint.setAntiAlias(true);
  19     paint.setColor(SK_ColorRED);
  20     canvas.drawCircle(50, 50, 50, paint);
  21 }
  22
  23 static void draw_2_bitmaps(SkCanvas* canvas, const SkBitmap& bm, bool doClip,
  24                            int dx, int dy, SkImageFilter* filter = NULL) {
  25     SkAutoCanvasRestore acr(canvas, true);
  26     SkPaint paint;
  27
  28     SkRect clipR = SkRect::MakeXYWH(SkIntToScalar(dx),
  29                                     SkIntToScalar(dy),
  30                                     SkIntToScalar(bm.width()),
  31                                     SkIntToScalar(bm.height()));
  32
  33     paint.setImageFilter(filter);
  34     clipR.inset(5, 5);
  35
  36     if (doClip) {
  37         canvas->save();
  38         canvas->clipRect(clipR);
  39     }
  40     canvas->drawSprite(bm, dx, dy, &paint);
  41     if (doClip) {
  42         canvas->restore();
  43     }
  44
  45     canvas->translate(SkIntToScalar(bm.width() + 20), 0);
  46
  47     if (doClip) {
  48         canvas->save();
  49         canvas->clipRect(clipR);
  50     }
  51     canvas->drawBitmap(bm, SkIntToScalar(dx), SkIntToScalar(dy), &paint);
  52     if (doClip) {
  53         canvas->restore();
  54     }
  55 }
  56
  57 /**
  58  *  Compare output of drawSprite and drawBitmap (esp. clipping and imagefilters)
  59  */
  60 class SpriteBitmapGM : public skiagm::GM {
  61 public:
  62     SpriteBitmapGM() {}
  63
  64 protected:
  65
  66     SkString onShortName() override {
  67         return SkString("spritebitmap");
  68     }
  69
  70     SkISize onISize() override {
  71         return SkISize::Make(640, 480);
  72     }
  73
  74     void onDraw(SkCanvas* canvas) override {
  75         SkBitmap bm;
  76         make_bm(&bm);
  77
  78         int dx = 10;
  79         int dy = 10;
  80
  81         SkScalar sigma = 8;
  82         SkAutoTUnref<SkImageFilter> filter(SkBlurImageFilter::Create(sigma, sigma));
  83
  84         draw_2_bitmaps(canvas, bm, false, dx, dy);
  85         dy += bm.height() + 20;
  86         draw_2_bitmaps(canvas, bm, false, dx, dy, filter);
  87         dy += bm.height() + 20;
  88         draw_2_bitmaps(canvas, bm, true, dx, dy);
  89         dy += bm.height() + 20;
  90         draw_2_bitmaps(canvas, bm, true, dx, dy, filter);
  91     }
  92
  93 private:
  94     typedef GM INHERITED;
  95 };
  96
  97 //////////////////////////////////////////////////////////////////////////////
  98
  99 DEF_GM( return new SpriteBitmapGM; )