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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 "SkOffsetImageFilter.h"
     10 #include "SkBitmapSource.h"
     11 
     12 #define WIDTH 600
     13 #define HEIGHT 100
     14 #define MARGIN 12
     15 
     16 namespace skiagm {
     17 
     18 class OffsetImageFilterGM : public GM {
     19 public:
     20     OffsetImageFilterGM() : fInitialized(false) {
     21         this->setBGColor(0xFF000000);
     22     }
     23 
     24 protected:
     25     virtual SkString onShortName() {
     26         return SkString("offsetimagefilter");
     27     }
     28 
     29     void make_bitmap() {
     30         fBitmap.allocN32Pixels(80, 80);
     31         SkCanvas canvas(fBitmap);
     32         canvas.clear(0x00000000);
     33         SkPaint paint;
     34         paint.setAntiAlias(true);
     35         paint.setColor(0xD000D000);
     36         paint.setTextSize(SkIntToScalar(96));
     37         const char* str = "e";
     38         canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
     39     }
     40 
     41     void make_checkerboard() {
     42         fCheckerboard.allocN32Pixels(80, 80);
     43         SkCanvas canvas(fCheckerboard);
     44         canvas.clear(0x00000000);
     45         SkPaint darkPaint;
     46         darkPaint.setColor(0xFF404040);
     47         SkPaint lightPaint;
     48         lightPaint.setColor(0xFFA0A0A0);
     49         for (int y = 0; y < 80; y += 16) {
     50           for (int x = 0; x < 80; x += 16) {
     51             canvas.save();
     52             canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
     53             canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
     54             canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
     55             canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
     56             canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
     57             canvas.restore();
     58           }
     59         }
     60     }
     61 
     62     virtual SkISize onISize() {
     63         return SkISize::Make(WIDTH, HEIGHT);
     64     }
     65 
     66     void drawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, SkScalar scale, const SkIRect& cropRect) {
     67         canvas->save();
     68         SkRect clipRect = SkRect::MakeWH(
     69             SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
     70         canvas->clipRect(clipRect);
     71         canvas->scale(scale, scale);
     72         canvas->drawBitmap(bitmap, 0, 0, &paint);
     73         canvas->restore();
     74         SkPaint strokePaint;
     75         strokePaint.setStyle(SkPaint::kStroke_Style);
     76         strokePaint.setColor(SK_ColorRED);
     77 
     78         // Draw a boundary rect around the intersection of the clip rect
     79         // and crop rect.
     80         SkMatrix scaleMatrix;
     81         scaleMatrix.setScale(scale, scale);
     82         SkRect cropRectFloat;
     83         scaleMatrix.mapRect(&cropRectFloat, SkRect::Make(cropRect));
     84         clipRect.intersect(cropRectFloat);
     85         canvas->drawRect(clipRect, strokePaint);
     86     }
     87 
     88     virtual void onDraw(SkCanvas* canvas) {
     89         if (!fInitialized) {
     90             make_bitmap();
     91             make_checkerboard();
     92             fInitialized = true;
     93         }
     94         canvas->clear(0x00000000);
     95         SkPaint paint;
     96 
     97         for (int i = 0; i < 4; i++) {
     98             SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
     99             SkIRect cropRect = SkIRect::MakeXYWH(i * 12,
    100                                                  i * 8,
    101                                                  bitmap->width() - i * 8,
    102                                                  bitmap->height() - i * 12);
    103             SkImageFilter::CropRect rect(SkRect::Make(cropRect));
    104             SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
    105             SkScalar dx = SkIntToScalar(i*5);
    106             SkScalar dy = SkIntToScalar(i*10);
    107             SkAutoTUnref<SkImageFilter> filter(
    108                 SkOffsetImageFilter::Create(dx, dy, tileInput, &rect));
    109             paint.setImageFilter(filter);
    110             drawClippedBitmap(canvas, *bitmap, paint, SK_Scalar1, cropRect);
    111             canvas->translate(SkIntToScalar(bitmap->width() + MARGIN), 0);
    112         }
    113 
    114         SkIRect cropRect = SkIRect::MakeXYWH(0, 0, 100, 100);
    115         SkImageFilter::CropRect rect(SkRect::Make(cropRect));
    116         SkAutoTUnref<SkImageFilter> filter(
    117             SkOffsetImageFilter::Create(SkIntToScalar(-5), SkIntToScalar(-10), NULL, &rect));
    118         paint.setImageFilter(filter);
    119         drawClippedBitmap(canvas, fBitmap, paint, SkIntToScalar(2), cropRect);
    120     }
    121 private:
    122     typedef GM INHERITED;
    123     SkBitmap fBitmap, fCheckerboard;
    124     bool fInitialized;
    125 };
    126 
    127 //////////////////////////////////////////////////////////////////////////////
    128 
    129 static GM* MyFactory(void*) { return new OffsetImageFilterGM; }
    130 static GMRegistry reg(MyFactory);
    131 
    132 }
    133