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      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 
     10 #include "SkBitmapSource.h"
     11 
     12 // This GM exercises the SkBitmapSource ImageFilter class.
     13 
     14 class BitmapSourceGM : public skiagm::GM {
     15 public:
     16     BitmapSourceGM() {
     17     }
     18 
     19 protected:
     20     virtual SkString onShortName() SK_OVERRIDE {
     21         return SkString("bitmapsource");
     22     }
     23 
     24     void makeBitmap() {
     25         fBitmap.allocN32Pixels(100, 100);
     26         SkCanvas canvas(fBitmap);
     27         canvas.clear(0x00000000);
     28         SkPaint paint;
     29         paint.setAntiAlias(true);
     30         paint.setColor(0xFFFFFFFF);
     31         paint.setTextSize(SkIntToScalar(96));
     32         const char* str = "e";
     33         canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
     34     }
     35 
     36     virtual SkISize onISize() SK_OVERRIDE { return SkISize::Make(500, 150); }
     37 
     38     virtual void onOnceBeforeDraw() SK_OVERRIDE {
     39         this->makeBitmap();
     40     }
     41 
     42     static void fillRectFiltered(SkCanvas* canvas, const SkRect& clipRect, SkImageFilter* filter) {
     43         SkPaint paint;
     44         paint.setImageFilter(filter);
     45         canvas->save();
     46         canvas->clipRect(clipRect);
     47         canvas->drawPaint(paint);
     48         canvas->restore();
     49     }
     50 
     51     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     52         canvas->clear(0x00000000);
     53         {
     54             SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
     55             SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
     56             SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100);
     57             SkRect bounds;
     58             fBitmap.getBounds(&bounds);
     59             SkAutoTUnref<SkImageFilter> bitmapSource(SkBitmapSource::Create(fBitmap));
     60             SkAutoTUnref<SkImageFilter> bitmapSourceSrcRect(SkBitmapSource::Create(fBitmap, srcRect, srcRect));
     61             SkAutoTUnref<SkImageFilter> bitmapSourceSrcRectDstRect(SkBitmapSource::Create(fBitmap, srcRect, dstRect));
     62             SkAutoTUnref<SkImageFilter> bitmapSourceDstRectOnly(SkBitmapSource::Create(fBitmap, bounds, dstRect));
     63 
     64             // Draw an unscaled bitmap.
     65             fillRectFiltered(canvas, clipRect, bitmapSource);
     66             canvas->translate(SkIntToScalar(100), 0);
     67 
     68             // Draw an unscaled subset of the source bitmap (srcRect -> srcRect).
     69             fillRectFiltered(canvas, clipRect, bitmapSourceSrcRect);
     70             canvas->translate(SkIntToScalar(100), 0);
     71 
     72             // Draw a subset of the bitmap scaled to a destination rect (srcRect -> dstRect).
     73             fillRectFiltered(canvas, clipRect, bitmapSourceSrcRectDstRect);
     74             canvas->translate(SkIntToScalar(100), 0);
     75 
     76             // Draw the entire bitmap scaled to a destination rect (bounds -> dstRect).
     77             fillRectFiltered(canvas, clipRect, bitmapSourceDstRectOnly);
     78             canvas->translate(SkIntToScalar(100), 0);
     79         }
     80     }
     81 
     82 private:
     83     SkBitmap fBitmap;
     84     typedef GM INHERITED;
     85 };
     86 
     87 ///////////////////////////////////////////////////////////////////////////////
     88 
     89 DEF_GM( return new BitmapSourceGM; )
     90