src/third_party/skia/gm/imagefilterscropexpand.cpp

   1 /*
   2  * Copyright 2014 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 "SkCanvas.h"
  10 #include "SkColorFilter.h"
  11 #include "SkColorPriv.h"
  12 #include "SkShader.h"
  13
  14 #include "SkBitmapSource.h"
  15 #include "SkBlurImageFilter.h"
  16 #include "SkColorMatrixFilter.h"
  17 #include "SkDisplacementMapEffect.h"
  18 #include "SkDropShadowImageFilter.h"
  19 #include "SkGradientShader.h"
  20 #include "SkMorphologyImageFilter.h"
  21 #include "SkColorFilterImageFilter.h"
  22 #include "SkMergeImageFilter.h"
  23 #include "SkOffsetImageFilter.h"
  24
  25 ///////////////////////////////////////////////////////////////////////////////
  26
  27 class ImageFiltersCropExpandGM : public skiagm::GM {
  28 public:
  29     ImageFiltersCropExpandGM () {}
  30
  31 protected:
  32
  33     virtual SkString onShortName() {
  34         return SkString("imagefilterscropexpand");
  35     }
  36
  37     virtual SkISize onISize() { return SkISize::Make(570, 650); }
  38
  39     void make_checkerboard(SkBitmap* bitmap) {
  40         bitmap->allocN32Pixels(64, 64);
  41         SkCanvas canvas(*bitmap);
  42         canvas.clear(0xFFFF0000);
  43         SkPaint darkPaint;
  44         darkPaint.setColor(0xFF404040);
  45         SkPaint lightPaint;
  46         lightPaint.setColor(0xFFA0A0A0);
  47         for (int y = 8; y < 48; y += 16) {
  48             for (int x = 8; x < 48; x += 16) {
  49                 canvas.save();
  50                 canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
  51                 canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
  52                 canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
  53                 canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
  54                 canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
  55                 canvas.restore();
  56             }
  57         }
  58     }
  59
  60     void make_gradient_circle(int width, int height, SkBitmap* bitmap) {
  61         SkScalar x = SkIntToScalar(width / 2);
  62         SkScalar y = SkIntToScalar(height / 2);
  63         SkScalar radius = SkMinScalar(x, y) * 0.8f;
  64         bitmap->allocN32Pixels(width, height);
  65         SkCanvas canvas(*bitmap);
  66         canvas.clear(0x00000000);
  67         SkColor colors[2];
  68         colors[0] = SK_ColorWHITE;
  69         colors[1] = SK_ColorBLACK;
  70         SkAutoTUnref<SkShader> shader(
  71             SkGradientShader::CreateRadial(SkPoint::Make(x, y), radius, colors, NULL, 2,
  72                                            SkShader::kClamp_TileMode)
  73         );
  74         SkPaint paint;
  75         paint.setShader(shader);
  76         canvas.drawCircle(x, y, radius, paint);
  77     }
  78
  79     static void draw(SkCanvas* canvas, const SkBitmap& bitmap, const SkRect& rect, SkImageFilter* filter) {
  80         SkPaint paint;
  81         paint.setImageFilter(filter)->unref();
  82         canvas->saveLayer(&rect, &paint);
  83         canvas->drawBitmap(bitmap, 0, 0);
  84         canvas->restore();
  85
  86         SkPaint strokePaint;
  87         strokePaint.setColor(0xFFFF0000);
  88         strokePaint.setStyle(SkPaint::kStroke_Style);
  89         canvas->drawRect(rect, strokePaint);
  90
  91         canvas->translate(SkIntToScalar(80), 0);
  92     }
  93
  94     virtual void onDraw(SkCanvas* canvas) {
  95         SkAutoTUnref<SkColorFilter> cf(
  96             SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
  97         SkImageFilter::CropRect crop_rect(
  98             SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)),
  99             SkImageFilter::CropRect::kHasAll_CropEdge);
 100
 101         SkBitmap gradient_circle, checkerboard;
 102         make_gradient_circle(64, 64, &gradient_circle);
 103         make_checkerboard(&checkerboard);
 104
 105         SkAutoTUnref<SkImageFilter> gradient_circle_source(
 106             SkBitmapSource::Create(gradient_circle));
 107         SkAutoTUnref<SkImageFilter> noop_cropped(
 108             SkOffsetImageFilter::Create(0, 0, NULL, &crop_rect));
 109         SkScalar sk255 = SkIntToScalar(255);
 110         SkScalar matrix[20] = { 1, 0, 0, 0, 0,
 111                                 0, 1, 0, 0, sk255,
 112                                 0, 0, 1, 0, 0,
 113                                 0, 0, 0, 0, sk255 };
 114         SkAutoTUnref<SkColorFilter> cf_alpha_trans(SkColorMatrixFilter::Create(matrix));
 115
 116         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
 117         SkScalar MARGIN = SkIntToScalar(12);
 118
 119         SkIRect bounds;
 120         r.roundOut(&bounds);
 121
 122         SkPaint paint;
 123         canvas->translate(MARGIN, MARGIN);
 124         for (int outset = -15; outset <= 20; outset += 5) {
 125             canvas->save();
 126             SkRect rect = crop_rect.rect();
 127             rect.outset(SkIntToScalar(outset),
 128                         SkIntToScalar(outset));
 129             SkImageFilter::CropRect big_rect(rect, SkImageFilter::CropRect::kHasAll_CropEdge);
 130
 131             draw(canvas, checkerboard, rect, SkColorFilterImageFilter::Create(
 132                 cf_alpha_trans, noop_cropped.get(), &big_rect));
 133
 134             draw(canvas, checkerboard, rect, SkBlurImageFilter::Create(
 135                 8.0f, 8.0f, noop_cropped.get(), &big_rect));
 136
 137             draw(canvas, checkerboard, rect, SkDilateImageFilter::Create(
 138                 2, 2, noop_cropped.get(), &big_rect));
 139
 140             draw(canvas, checkerboard, rect, SkErodeImageFilter::Create(
 141                 2, 2, noop_cropped.get(), &big_rect));
 142
 143             draw(canvas, checkerboard, rect, SkDropShadowImageFilter::Create(
 144                 SkIntToScalar(10), SkIntToScalar(10), SkIntToScalar(3), SkIntToScalar(3),
 145                 SK_ColorBLUE, SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
 146                 noop_cropped.get(), &big_rect, 0));
 147
 148             draw(canvas, checkerboard, rect, SkDisplacementMapEffect::Create(
 149                 SkDisplacementMapEffect::kR_ChannelSelectorType,
 150                 SkDisplacementMapEffect::kR_ChannelSelectorType,
 151                 SkIntToScalar(12),
 152                 gradient_circle_source.get(),
 153                 noop_cropped.get(),
 154                 &big_rect));
 155
 156             draw(canvas, checkerboard, rect, SkOffsetImageFilter::Create(
 157                 SkIntToScalar(-8), SkIntToScalar(16), noop_cropped.get(), &big_rect));
 158
 159             canvas->restore();
 160             canvas->translate(0, SkIntToScalar(80));
 161         }
 162     }
 163
 164 private:
 165     typedef GM INHERITED;
 166 };
 167
 168 ///////////////////////////////////////////////////////////////////////////////
 169
 170 static skiagm::GM* MyFactory(void*) { return new ImageFiltersCropExpandGM; }
 171 static skiagm::GMRegistry reg(MyFactory);