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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 #include "SkColor.h"
     10 #include "SkBicubicImageFilter.h"
     11 
     12 namespace skiagm {
     13 
     14 class BicubicGM : public GM {
     15 public:
     16     BicubicGM() : fInitialized(false) {
     17         this->setBGColor(0x00000000);
     18     }
     19 
     20 protected:
     21     virtual SkString onShortName() {
     22         return SkString("bicubicfilter");
     23     }
     24 
     25     void make_checkerboard(int width, int height) {
     26         SkASSERT(width % 2 == 0);
     27         SkASSERT(height % 2 == 0);
     28         fCheckerboard.setConfig(SkBitmap::kARGB_8888_Config, width, height);
     29         fCheckerboard.allocPixels();
     30         SkAutoLockPixels lock(fCheckerboard);
     31         for (int y = 0; y < height; y += 2) {
     32             SkPMColor* s = fCheckerboard.getAddr32(0, y);
     33             for (int x = 0; x < width; x += 2) {
     34                 *s++ = 0xFFFFFFFF;
     35                 *s++ = 0xFF000000;
     36             }
     37             s = fCheckerboard.getAddr32(0, y + 1);
     38             for (int x = 0; x < width; x += 2) {
     39                 *s++ = 0xFF000000;
     40                 *s++ = 0xFFFFFFFF;
     41             }
     42         }
     43     }
     44 
     45     virtual SkISize onISize() {
     46         return make_isize(400, 300);
     47     }
     48 
     49     virtual void onDraw(SkCanvas* canvas) {
     50         if (!fInitialized) {
     51             make_checkerboard(4, 4);
     52             fInitialized = true;
     53         }
     54         SkScalar sk32 = SkIntToScalar(32);
     55         canvas->clear(0x00000000);
     56         SkPaint bilinearPaint, bicubicPaint;
     57         SkSize scale = SkSize::Make(sk32, sk32);
     58         canvas->save();
     59         canvas->scale(sk32, sk32);
     60         bilinearPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
     61         canvas->drawBitmap(fCheckerboard, 0, 0, &bilinearPaint);
     62         canvas->restore();
     63         SkAutoTUnref<SkImageFilter> bicubic(SkBicubicImageFilter::CreateMitchell(scale));
     64         bicubicPaint.setImageFilter(bicubic);
     65         SkRect srcBounds;
     66         fCheckerboard.getBounds(&srcBounds);
     67         canvas->translate(SkIntToScalar(140), 0);
     68         canvas->saveLayer(&srcBounds, &bicubicPaint);
     69         canvas->drawBitmap(fCheckerboard, 0, 0);
     70         canvas->restore();
     71     }
     72 
     73 private:
     74     typedef GM INHERITED;
     75     SkBitmap fCheckerboard;
     76     bool fInitialized;
     77 };
     78 
     79 //////////////////////////////////////////////////////////////////////////////
     80 
     81 static GM* MyFactory(void*) { return new BicubicGM; }
     82 static GMRegistry reg(MyFactory);
     83 
     84 }
     85