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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 "sk_tool_utils.h"
      9 #include "SkBitmapSource.h"
     10 #include "SkOffsetImageFilter.h"
     11 #include "gm.h"
     12 
     13 #define WIDTH 600
     14 #define HEIGHT 100
     15 #define MARGIN 12
     16 
     17 namespace skiagm {
     18 
     19 class OffsetImageFilterGM : public GM {
     20 public:
     21     OffsetImageFilterGM() : fInitialized(false) {
     22         this->setBGColor(0xFF000000);
     23     }
     24 
     25 protected:
     26     virtual SkString onShortName() {
     27         return SkString("offsetimagefilter");
     28     }
     29 
     30     void make_bitmap() {
     31         fBitmap.allocN32Pixels(80, 80);
     32         SkCanvas canvas(fBitmap);
     33         canvas.clear(0x00000000);
     34         SkPaint paint;
     35         paint.setAntiAlias(true);
     36         sk_tool_utils::set_portable_typeface(&paint);
     37         paint.setColor(0xD000D000);
     38         paint.setTextSize(SkIntToScalar(96));
     39         const char* str = "e";
     40         canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
     41     }
     42 
     43     virtual SkISize onISize() {
     44         return SkISize::Make(WIDTH, HEIGHT);
     45     }
     46 
     47     void drawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, SkScalar scale, const SkIRect& cropRect) {
     48         canvas->save();
     49         SkRect clipRect = SkRect::MakeWH(
     50             SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
     51         canvas->clipRect(clipRect);
     52         canvas->scale(scale, scale);
     53         canvas->drawBitmap(bitmap, 0, 0, &paint);
     54         canvas->restore();
     55         SkPaint strokePaint;
     56         strokePaint.setStyle(SkPaint::kStroke_Style);
     57         strokePaint.setColor(SK_ColorRED);
     58 
     59         // Draw a boundary rect around the intersection of the clip rect
     60         // and crop rect.
     61         SkMatrix scaleMatrix;
     62         scaleMatrix.setScale(scale, scale);
     63         SkRect cropRectFloat;
     64         scaleMatrix.mapRect(&cropRectFloat, SkRect::Make(cropRect));
     65         if (clipRect.intersect(cropRectFloat)) {
     66             canvas->drawRect(clipRect, strokePaint);
     67         }
     68     }
     69 
     70     virtual void onDraw(SkCanvas* canvas) {
     71         if (!fInitialized) {
     72             make_bitmap();
     73 
     74             fCheckerboard.allocN32Pixels(80, 80);
     75             SkCanvas checkerboardCanvas(fCheckerboard);
     76             sk_tool_utils::draw_checkerboard(&checkerboardCanvas, 0xFFA0A0A0, 0xFF404040, 8);
     77 
     78             fInitialized = true;
     79         }
     80         canvas->clear(SK_ColorBLACK);
     81         SkPaint paint;
     82 
     83         for (int i = 0; i < 4; i++) {
     84             SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
     85             SkIRect cropRect = SkIRect::MakeXYWH(i * 12,
     86                                                  i * 8,
     87                                                  bitmap->width() - i * 8,
     88                                                  bitmap->height() - i * 12);
     89             SkImageFilter::CropRect rect(SkRect::Make(cropRect));
     90             SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
     91             SkScalar dx = SkIntToScalar(i*5);
     92             SkScalar dy = SkIntToScalar(i*10);
     93             SkAutoTUnref<SkImageFilter> filter(
     94                 SkOffsetImageFilter::Create(dx, dy, tileInput, &rect));
     95             paint.setImageFilter(filter);
     96             drawClippedBitmap(canvas, *bitmap, paint, SK_Scalar1, cropRect);
     97             canvas->translate(SkIntToScalar(bitmap->width() + MARGIN), 0);
     98         }
     99 
    100         SkIRect cropRect = SkIRect::MakeXYWH(0, 0, 100, 100);
    101         SkImageFilter::CropRect rect(SkRect::Make(cropRect));
    102         SkAutoTUnref<SkImageFilter> filter(
    103             SkOffsetImageFilter::Create(SkIntToScalar(-5), SkIntToScalar(-10), NULL, &rect));
    104         paint.setImageFilter(filter);
    105         drawClippedBitmap(canvas, fBitmap, paint, SkIntToScalar(2), cropRect);
    106     }
    107 private:
    108     typedef GM INHERITED;
    109     SkBitmap fBitmap, fCheckerboard;
    110     bool fInitialized;
    111 };
    112 
    113 //////////////////////////////////////////////////////////////////////////////
    114 
    115 static GM* MyFactory(void*) { return new OffsetImageFilterGM; }
    116 static GMRegistry reg(MyFactory);
    117 
    118 }
    119