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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 "SkImage.h"
     11 #include "SkImageSource.h"
     12 
     13 // This GM exercises the SkImageSource ImageFilter class.
     14 
     15 class ImageSourceGM : public skiagm::GM {
     16 public:
     17     ImageSourceGM() { }
     18 
     19 protected:
     20     SkString onShortName() override {
     21         return SkString("imagesource");
     22     }
     23 
     24     SkISize onISize() override { return SkISize::Make(500, 150); }
     25 
     26     void onOnceBeforeDraw() override {
     27         SkBitmap bm = sk_tool_utils::create_string_bitmap(100, 100, 0xFFFFFFFF, 20, 70, 96, "e");
     28         fImage.reset(SkImage::NewFromBitmap(bm));
     29     }
     30 
     31     static void FillRectFiltered(SkCanvas* canvas, const SkRect& clipRect, SkImageFilter* filter) {
     32         SkPaint paint;
     33         paint.setImageFilter(filter);
     34         canvas->save();
     35         canvas->clipRect(clipRect);
     36         canvas->drawPaint(paint);
     37         canvas->restore();
     38     }
     39 
     40     void onDraw(SkCanvas* canvas) override {
     41         canvas->clear(SK_ColorBLACK);
     42         {
     43             SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
     44             SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
     45             SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100);
     46             SkRect bounds = SkRect::MakeIWH(fImage->width(), fImage->height());
     47             SkAutoTUnref<SkImageFilter> imageSource(SkImageSource::Create(fImage));
     48             SkAutoTUnref<SkImageFilter> imageSourceSrcRect(
     49                 SkImageSource::Create(fImage, srcRect, srcRect, kHigh_SkFilterQuality));
     50             SkAutoTUnref<SkImageFilter> imageSourceSrcRectDstRect(
     51                 SkImageSource::Create(fImage, srcRect, dstRect, kHigh_SkFilterQuality));
     52             SkAutoTUnref<SkImageFilter> imageSourceDstRectOnly(
     53                 SkImageSource::Create(fImage, bounds, dstRect, kHigh_SkFilterQuality));
     54 
     55             // Draw an unscaled bitmap.
     56             FillRectFiltered(canvas, clipRect, imageSource);
     57             canvas->translate(SkIntToScalar(100), 0);
     58 
     59             // Draw an unscaled subset of the source bitmap (srcRect -> srcRect).
     60             FillRectFiltered(canvas, clipRect, imageSourceSrcRect);
     61             canvas->translate(SkIntToScalar(100), 0);
     62 
     63             // Draw a subset of the bitmap scaled to a destination rect (srcRect -> dstRect).
     64             FillRectFiltered(canvas, clipRect, imageSourceSrcRectDstRect);
     65             canvas->translate(SkIntToScalar(100), 0);
     66 
     67             // Draw the entire bitmap scaled to a destination rect (bounds -> dstRect).
     68             FillRectFiltered(canvas, clipRect, imageSourceDstRectOnly);
     69             canvas->translate(SkIntToScalar(100), 0);
     70         }
     71     }
     72 
     73 private:
     74     SkAutoTUnref<SkImage> fImage;
     75     typedef GM INHERITED;
     76 };
     77 
     78 ///////////////////////////////////////////////////////////////////////////////
     79 
     80 DEF_GM( return new ImageSourceGM; )
     81