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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_X SkIntToScalar(2)
     27 #define RESIZE_FACTOR_Y SkIntToScalar(5)
     28 
     29 static sk_sp<SkImage> make_gradient_circle(int width, int height) {
     30     SkScalar x = SkIntToScalar(width / 2);
     31     SkScalar y = SkIntToScalar(height / 2);
     32     SkScalar radius = SkMinScalar(x, y) * 0.8f;
     33     auto surface(SkSurface::MakeRasterN32Premul(width, height));
     34     SkCanvas* canvas = surface->getCanvas();
     35     canvas->clear(0x00000000);
     36     SkColor colors[2];
     37     colors[0] = SK_ColorWHITE;
     38     colors[1] = SK_ColorBLACK;
     39     SkPaint paint;
     40     paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr,
     41         2, SkShader::kClamp_TileMode));
     42     canvas->drawCircle(x, y, radius, paint);
     43     return surface->makeImageSnapshot();
     44 }
     45 
     46 static void draw_clipped_filter(SkCanvas* canvas, sk_sp<SkImageFilter> filter, size_t i,
     47                                 const SkRect& primBounds, const SkRect& clipBounds) {
     48     SkPaint paint;
     49     paint.setColor(SK_ColorWHITE);
     50     paint.setImageFilter(std::move(filter));
     51     paint.setAntiAlias(true);
     52     canvas->save();
     53     canvas->clipRect(clipBounds);
     54     if (5 == i) {
     55         canvas->translate(SkIntToScalar(16), SkIntToScalar(-32));
     56     } else if (6 == i) {
     57         canvas->scale(SkScalarInvert(RESIZE_FACTOR_X), SkScalarInvert(RESIZE_FACTOR_Y));
     58     }
     59     canvas->drawCircle(primBounds.centerX(), primBounds.centerY(),
     60                        primBounds.width() * 2 / 5, paint);
     61     canvas->restore();
     62 }
     63 
     64 namespace skiagm {
     65 
     66 class ImageFiltersClippedGM : public GM {
     67 public:
     68     ImageFiltersClippedGM() {
     69         this->setBGColor(0x00000000);
     70     }
     71 
     72 protected:
     73     SkString onShortName() override {
     74         return SkString("imagefiltersclipped");
     75     }
     76 
     77     SkISize onISize() override {
     78         return SkISize::Make(860, 500);
     79     }
     80 
     81     void onOnceBeforeDraw() override {
     82         fCheckerboard = SkImage::MakeFromBitmap
     83             (sk_tool_utils::create_checkerboard_bitmap(64, 64, 0xFFA0A0A0, 0xFF404040, 8));
     84         fGradientCircle = make_gradient_circle(64, 64);
     85     }
     86 
     87     void onDraw(SkCanvas* canvas) override {
     88         canvas->clear(SK_ColorBLACK);
     89 
     90         sk_sp<SkImageFilter> gradient(SkImageSource::Make(fGradientCircle));
     91         sk_sp<SkImageFilter> checkerboard(SkImageSource::Make(fCheckerboard));
     92         SkMatrix resizeMatrix;
     93         resizeMatrix.setScale(RESIZE_FACTOR_X, RESIZE_FACTOR_Y);
     94         SkPoint3 pointLocation = SkPoint3::Make(32, 32, SkIntToScalar(10));
     95 
     96         sk_sp<SkImageFilter> filters[] = {
     97             SkBlurImageFilter::Make(SkIntToScalar(12), SkIntToScalar(12), nullptr),
     98             SkDropShadowImageFilter::Make(
     99                                     SkIntToScalar(10), SkIntToScalar(10),
    100                                     SkIntToScalar(3), SkIntToScalar(3), SK_ColorGREEN,
    101                                     SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
    102                                     nullptr),
    103             SkDisplacementMapEffect::Make(SkDisplacementMapEffect::kR_ChannelSelectorType,
    104                                           SkDisplacementMapEffect::kR_ChannelSelectorType,
    105                                           SkIntToScalar(12),
    106                                           std::move(gradient),
    107                                           checkerboard),
    108             SkDilateImageFilter::Make(2, 2, checkerboard),
    109             SkErodeImageFilter::Make(2, 2, checkerboard),
    110             SkOffsetImageFilter::Make(SkIntToScalar(-16), SkIntToScalar(32), nullptr),
    111             SkImageFilter::MakeMatrixFilter(resizeMatrix, kNone_SkFilterQuality, nullptr),
    112             SkLightingImageFilter::MakePointLitDiffuse(pointLocation, SK_ColorWHITE, SK_Scalar1,
    113                                                        SkIntToScalar(2), checkerboard),
    114 
    115         };
    116 
    117         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
    118         SkScalar margin = SkIntToScalar(16);
    119         SkRect bounds = r;
    120         bounds.outset(margin, margin);
    121 
    122         canvas->save();
    123         for (int xOffset = 0; xOffset < 80; xOffset += 16) {
    124             canvas->save();
    125             bounds.fLeft = SkIntToScalar(xOffset);
    126             for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
    127                 draw_clipped_filter(canvas, filters[i], i, r, bounds);
    128                 canvas->translate(r.width() + margin, 0);
    129             }
    130             canvas->restore();
    131             canvas->translate(0, r.height() + margin);
    132         }
    133         canvas->restore();
    134 
    135         SkPaint noisePaint;
    136         noisePaint.setShader(SkPerlinNoiseShader::MakeFractalNoise(0.1f, 0.05f, 1, 0));
    137 
    138         sk_sp<SkImageFilter> rectFilter(SkPaintImageFilter::Make(noisePaint));
    139         canvas->translate(SK_ARRAY_COUNT(filters)*(r.width() + margin), 0);
    140         for (int xOffset = 0; xOffset < 80; xOffset += 16) {
    141             bounds.fLeft = SkIntToScalar(xOffset);
    142             draw_clipped_filter(canvas, rectFilter, 0, r, bounds);
    143             canvas->translate(0, r.height() + margin);
    144         }
    145     }
    146 
    147 private:
    148     sk_sp<SkImage> fCheckerboard, fGradientCircle;
    149 
    150     typedef GM INHERITED;
    151 };
    152 
    153 //////////////////////////////////////////////////////////////////////////////
    154 
    155 DEF_GM(return new ImageFiltersClippedGM;)
    156 }
    157