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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         sk_tool_utils::set_portable_typeface(&paint);
     36         paint.setColor(0xD000D000);
     37         paint.setTextSize(SkIntToScalar(96));
     38         const char* str = "e";
     39         canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
     40     }
     41 
     42     void make_checkerboard() {
     43         fCheckerboard.allocN32Pixels(80, 80);
     44         SkCanvas canvas(fCheckerboard);
     45         canvas.clear(0x00000000);
     46         SkPaint darkPaint;
     47         darkPaint.setColor(0xFF404040);
     48         SkPaint lightPaint;
     49         lightPaint.setColor(0xFFA0A0A0);
     50         for (int y = 0; y < 80; y += 16) {
     51           for (int x = 0; x < 80; x += 16) {
     52             canvas.save();
     53             canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
     54             canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
     55             canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
     56             canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
     57             canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
     58             canvas.restore();
     59           }
     60         }
     61     }
     62 
     63     virtual SkISize onISize() {
     64         return SkISize::Make(WIDTH, HEIGHT);
     65     }
     66 
     67     void drawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, SkScalar scale, const SkIRect& cropRect) {
     68         canvas->save();
     69         SkRect clipRect = SkRect::MakeWH(
     70             SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
     71         canvas->clipRect(clipRect);
     72         canvas->scale(scale, scale);
     73         canvas->drawBitmap(bitmap, 0, 0, &paint);
     74         canvas->restore();
     75         SkPaint strokePaint;
     76         strokePaint.setStyle(SkPaint::kStroke_Style);
     77         strokePaint.setColor(SK_ColorRED);
     78 
     79         // Draw a boundary rect around the intersection of the clip rect
     80         // and crop rect.
     81         SkMatrix scaleMatrix;
     82         scaleMatrix.setScale(scale, scale);
     83         SkRect cropRectFloat;
     84         scaleMatrix.mapRect(&cropRectFloat, SkRect::Make(cropRect));
     85         clipRect.intersect(cropRectFloat);
     86         canvas->drawRect(clipRect, strokePaint);
     87     }
     88 
     89     virtual void onDraw(SkCanvas* canvas) {
     90         if (!fInitialized) {
     91             make_bitmap();
     92             make_checkerboard();
     93             fInitialized = true;
     94         }
     95         canvas->clear(0x00000000);
     96         SkPaint paint;
     97 
     98         for (int i = 0; i < 4; i++) {
     99             SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
    100             SkIRect cropRect = SkIRect::MakeXYWH(i * 12,
    101                                                  i * 8,
    102                                                  bitmap->width() - i * 8,
    103                                                  bitmap->height() - i * 12);
    104             SkImageFilter::CropRect rect(SkRect::Make(cropRect));
    105             SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
    106             SkScalar dx = SkIntToScalar(i*5);
    107             SkScalar dy = SkIntToScalar(i*10);
    108             SkAutoTUnref<SkImageFilter> filter(
    109                 SkOffsetImageFilter::Create(dx, dy, tileInput, &rect));
    110             paint.setImageFilter(filter);
    111             drawClippedBitmap(canvas, *bitmap, paint, SK_Scalar1, cropRect);
    112             canvas->translate(SkIntToScalar(bitmap->width() + MARGIN), 0);
    113         }
    114 
    115         SkIRect cropRect = SkIRect::MakeXYWH(0, 0, 100, 100);
    116         SkImageFilter::CropRect rect(SkRect::Make(cropRect));
    117         SkAutoTUnref<SkImageFilter> filter(
    118             SkOffsetImageFilter::Create(SkIntToScalar(-5), SkIntToScalar(-10), NULL, &rect));
    119         paint.setImageFilter(filter);
    120         drawClippedBitmap(canvas, fBitmap, paint, SkIntToScalar(2), cropRect);
    121     }
    122 private:
    123     typedef GM INHERITED;
    124     SkBitmap fBitmap, fCheckerboard;
    125     bool fInitialized;
    126 };
    127 
    128 //////////////////////////////////////////////////////////////////////////////
    129 
    130 static GM* MyFactory(void*) { return new OffsetImageFilterGM; }
    131 static GMRegistry reg(MyFactory);
    132 
    133 }
    134