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      1 /*
      2  * Copyright 2016 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 "sk_tool_utils.h"
     10 #include "SkBlurImageFilter.h"
     11 #include "SkCanvas.h"
     12 #include "SkColorFilter.h"
     13 #include "SkColorFilterImageFilter.h"
     14 #include "SkDropShadowImageFilter.h"
     15 #include "SkSurface.h"
     16 
     17 ///////////////////////////////////////////////////////////////////////////////
     18 
     19 static void show_bounds(SkCanvas* canvas, const SkIRect& subset, const SkIRect& clip) {
     20     SkIRect rects[] { subset, clip };
     21     SkColor colors[] { SK_ColorRED, SK_ColorBLUE };
     22 
     23     SkPaint paint;
     24     paint.setStyle(SkPaint::kStroke_Style);
     25 
     26     for (size_t i = 0; i < SK_ARRAY_COUNT(rects); ++i) {
     27         paint.setColor(colors[i]);
     28         canvas->drawRect(SkRect::Make(rects[i]), paint);
     29     }
     30 }
     31 
     32 // In this GM, we're going to feed the inner portion of a 100x100 checkboard
     33 // (i.e., strip off a 25-wide border) through the makeWithFilter method.
     34 // We'll then draw the appropriate subset of the result to the screen at the
     35 // given offset.
     36 class ImageMakeWithFilterGM : public skiagm::GM {
     37 public:
     38     ImageMakeWithFilterGM () {}
     39 
     40 protected:
     41     SkString onShortName() override {
     42         return SkString("imagemakewithfilter");
     43     }
     44 
     45     SkISize onISize() override { return SkISize::Make(440, 530); }
     46 
     47     void onDraw(SkCanvas* canvas) override {
     48         auto cf = SkColorFilter::MakeModeFilter(SK_ColorGREEN, SkBlendMode::kSrc);
     49         sk_sp<SkImageFilter> filters[] = {
     50             SkColorFilterImageFilter::Make(std::move(cf), nullptr),
     51             SkBlurImageFilter::Make(2.0f, 2.0f, nullptr),
     52             SkDropShadowImageFilter::Make(
     53                 10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
     54                 SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
     55                 nullptr),
     56         };
     57 
     58         SkIRect clipBounds[] {
     59             { -20, -20, 100, 100 },
     60             {   0,   0,  75,  75 },
     61             {  20,  20, 100, 100 },
     62             { -20, -20,  50,  50 },
     63             {  20,  20,  50,  50 },
     64         };
     65 
     66         SkImageInfo info = SkImageInfo::MakeN32(100, 100, kPremul_SkAlphaType);
     67         SkScalar MARGIN = SkIntToScalar(40);
     68         SkScalar DX = info.width() + MARGIN;
     69         SkScalar DY = info.height() + MARGIN;
     70 
     71         canvas->translate(MARGIN, MARGIN);
     72 
     73         sk_sp<SkSurface> surface = sk_tool_utils::makeSurface(canvas, info);
     74         sk_tool_utils::draw_checkerboard(surface->getCanvas());
     75         sk_sp<SkImage> source = surface->makeImageSnapshot();
     76 
     77         for (auto clipBound : clipBounds) {
     78             canvas->save();
     79             for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
     80                 SkIRect subset = SkIRect::MakeXYWH(25, 25, 50, 50);
     81                 SkIRect outSubset;
     82                 SkIPoint offset;
     83                 sk_sp<SkImage> result = source->makeWithFilter(filters[i].get(), subset, clipBound,
     84                                                                &outSubset, &offset);
     85                 SkASSERT(result);
     86                 SkASSERT(source->isTextureBacked() == result->isTextureBacked());
     87                 result = result->makeSubset(outSubset);
     88                 canvas->drawImage(result.get(), SkIntToScalar(offset.fX), SkIntToScalar(offset.fY));
     89                 show_bounds(canvas, SkIRect::MakeXYWH(offset.x(), offset.y(), outSubset.width(),
     90                                                       outSubset.height()), clipBound);
     91                 canvas->translate(DX, 0);
     92             }
     93             canvas->restore();
     94             canvas->translate(0, DY);
     95         }
     96     }
     97 
     98 private:
     99     typedef GM INHERITED;
    100 };
    101 DEF_GM( return new ImageMakeWithFilterGM; )
    102