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      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 "SkBlurImageFilter.h"
      9 #include "SkColor.h"
     10 #include "SkDisplacementMapEffect.h"
     11 #include "SkDropShadowImageFilter.h"
     12 #include "SkGradientShader.h"
     13 #include "SkImage.h"
     14 #include "SkImageSource.h"
     15 #include "SkLightingImageFilter.h"
     16 #include "SkMorphologyImageFilter.h"
     17 #include "SkOffsetImageFilter.h"
     18 #include "SkPaintImageFilter.h"
     19 #include "SkPerlinNoiseShader.h"
     20 #include "SkPoint3.h"
     21 #include "SkScalar.h"
     22 #include "SkSurface.h"
     23 #include "gm.h"
     24 #include "sk_tool_utils.h"
     25 
     26 #define RESIZE_FACTOR SkIntToScalar(4)
     27 
     28 static sk_sp<SkImage> make_gradient_circle(int width, int height) {
     29     SkScalar x = SkIntToScalar(width / 2);
     30     SkScalar y = SkIntToScalar(height / 2);
     31     SkScalar radius = SkMinScalar(x, y) * 4 / 5;
     32     sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(width, height));
     33     SkCanvas* canvas = surface->getCanvas();
     34     canvas->clear(0x00000000);
     35     SkColor colors[2];
     36     colors[0] = SK_ColorWHITE;
     37     colors[1] = SK_ColorBLACK;
     38     SkPaint paint;
     39     paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr,
     40         2, SkShader::kClamp_TileMode));
     41     canvas->drawCircle(x, y, radius, paint);
     42 
     43     return surface->makeImageSnapshot();
     44 }
     45 
     46 
     47 namespace skiagm {
     48 
     49 class ImageFiltersScaledGM : public GM {
     50 public:
     51     ImageFiltersScaledGM() {
     52         this->setBGColor(0x00000000);
     53     }
     54 
     55 protected:
     56 
     57     SkString onShortName() override {
     58         return SkString("imagefiltersscaled");
     59     }
     60 
     61     SkISize onISize() override {
     62         return SkISize::Make(1428, 500);
     63     }
     64 
     65     void onOnceBeforeDraw() override {
     66         fCheckerboard = SkImage::MakeFromBitmap(
     67             sk_tool_utils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8));
     68         fGradientCircle = make_gradient_circle(64, 64);
     69     }
     70 
     71     void onDraw(SkCanvas* canvas) override {
     72         canvas->clear(SK_ColorBLACK);
     73 
     74         sk_sp<SkImageFilter> gradient(SkImageSource::Make(fGradientCircle));
     75         sk_sp<SkImageFilter> checkerboard(SkImageSource::Make(fCheckerboard));
     76 
     77         SkPaint noisePaint;
     78         noisePaint.setShader(SkPerlinNoiseShader::MakeFractalNoise(SkDoubleToScalar(0.1),
     79                                                                    SkDoubleToScalar(0.05), 1, 0));
     80 
     81         SkPoint3 pointLocation = SkPoint3::Make(0, 0, SkIntToScalar(10));
     82         SkPoint3 spotLocation = SkPoint3::Make(SkIntToScalar(-10),
     83                                                SkIntToScalar(-10),
     84                                                SkIntToScalar(20));
     85         SkPoint3 spotTarget = SkPoint3::Make(SkIntToScalar(40), SkIntToScalar(40), 0);
     86         SkScalar spotExponent = SK_Scalar1;
     87         SkScalar cutoffAngle = SkIntToScalar(15);
     88         SkScalar kd = SkIntToScalar(2);
     89         SkScalar surfaceScale = SkIntToScalar(1);
     90         SkColor white(0xFFFFFFFF);
     91         SkMatrix resizeMatrix;
     92         resizeMatrix.setScale(RESIZE_FACTOR, RESIZE_FACTOR);
     93 
     94         sk_sp<SkImageFilter> filters[] = {
     95             SkBlurImageFilter::Make(SkIntToScalar(4), SkIntToScalar(4), nullptr),
     96             SkDropShadowImageFilter::Make(
     97                                     SkIntToScalar(5), SkIntToScalar(10),
     98                                     SkIntToScalar(3), SkIntToScalar(3), SK_ColorYELLOW,
     99                                     SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
    100                                     nullptr),
    101             SkDisplacementMapEffect::Make(SkDisplacementMapEffect::kR_ChannelSelectorType,
    102                                           SkDisplacementMapEffect::kR_ChannelSelectorType,
    103                                           SkIntToScalar(12),
    104                                           std::move(gradient),
    105                                           checkerboard),
    106             SkDilateImageFilter::Make(1, 1, checkerboard),
    107             SkErodeImageFilter::Make(1, 1, checkerboard),
    108             SkOffsetImageFilter::Make(SkIntToScalar(32), 0, nullptr),
    109             SkImageFilter::MakeMatrixFilter(resizeMatrix, kNone_SkFilterQuality, nullptr),
    110             SkPaintImageFilter::Make(noisePaint),
    111             SkLightingImageFilter::MakePointLitDiffuse(pointLocation, white, surfaceScale, kd,
    112                                                        nullptr),
    113             SkLightingImageFilter::MakeSpotLitDiffuse(spotLocation, spotTarget, spotExponent,
    114                                                       cutoffAngle, white, surfaceScale, kd,
    115                                                       nullptr),
    116         };
    117 
    118         SkVector scales[] = {
    119             SkVector::Make(SkScalarInvert(2), SkScalarInvert(2)),
    120             SkVector::Make(SkIntToScalar(1), SkIntToScalar(1)),
    121             SkVector::Make(SkIntToScalar(1), SkIntToScalar(2)),
    122             SkVector::Make(SkIntToScalar(2), SkIntToScalar(1)),
    123             SkVector::Make(SkIntToScalar(2), SkIntToScalar(2)),
    124         };
    125 
    126         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
    127         SkScalar margin = SkIntToScalar(16);
    128         SkRect bounds = r;
    129         bounds.outset(margin, margin);
    130 
    131         for (size_t j = 0; j < SK_ARRAY_COUNT(scales); ++j) {
    132             canvas->save();
    133             for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
    134                 SkPaint paint;
    135                 paint.setColor(SK_ColorBLUE);
    136                 paint.setImageFilter(filters[i]);
    137                 paint.setAntiAlias(true);
    138                 canvas->save();
    139                 canvas->scale(scales[j].fX, scales[j].fY);
    140                 canvas->clipRect(r);
    141                 if (5 == i) {
    142                     canvas->translate(SkIntToScalar(-32), 0);
    143                 } else if (6 == i) {
    144                     canvas->scale(SkScalarInvert(RESIZE_FACTOR),
    145                                   SkScalarInvert(RESIZE_FACTOR));
    146                 }
    147                 canvas->drawCircle(r.centerX(), r.centerY(), r.width()*2/5, paint);
    148                 canvas->restore();
    149                 canvas->translate(r.width() * scales[j].fX + margin, 0);
    150             }
    151             canvas->restore();
    152             canvas->translate(0, r.height() * scales[j].fY + margin);
    153         }
    154     }
    155 
    156 private:
    157     sk_sp<SkImage> fCheckerboard, fGradientCircle;
    158 
    159     typedef GM INHERITED;
    160 };
    161 
    162 //////////////////////////////////////////////////////////////////////////////
    163 
    164 DEF_GM(return new ImageFiltersScaledGM;)
    165 }
    166