gm/imagefiltersstroked.cpp

   1 /*
   2  * Copyright 2015 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 "SkDropShadowImageFilter.h"
  11 #include "SkOffsetImageFilter.h"
  12 #include "SkScalar.h"
  13 #include "gm.h"
  14
  15 #define RESIZE_FACTOR_X SkIntToScalar(2)
  16 #define RESIZE_FACTOR_Y SkIntToScalar(5)
  17
  18 namespace skiagm {
  19
  20 class ImageFiltersStrokedGM : public GM {
  21 public:
  22     ImageFiltersStrokedGM() {
  23         this->setBGColor(0x00000000);
  24     }
  25
  26 protected:
  27
  28     SkString onShortName() override {
  29         return SkString("imagefiltersstroked");
  30     }
  31
  32     SkISize onISize() override {
  33         return SkISize::Make(860, 500);
  34     }
  35
  36     static void draw_circle(SkCanvas* canvas, const SkRect& r, const SkPaint& paint) {
  37         canvas->drawCircle(r.centerX(), r.centerY(),
  38                            r.width() * 2 / 5, paint);
  39     }
  40
  41     static void draw_line(SkCanvas* canvas, const SkRect& r, const SkPaint& paint) {
  42         canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, paint);
  43     }
  44
  45     static void draw_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& paint) {
  46         canvas->drawRect(r, paint);
  47     }
  48
  49     void onDraw(SkCanvas* canvas) override {
  50         void (*drawProc[])(SkCanvas*, const SkRect&, const SkPaint&) = {
  51             draw_line, draw_rect, draw_circle,
  52         };
  53
  54         canvas->clear(SK_ColorBLACK);
  55
  56         SkMatrix resizeMatrix;
  57         resizeMatrix.setScale(RESIZE_FACTOR_X, RESIZE_FACTOR_Y);
  58
  59         sk_sp<SkImageFilter> filters[] = {
  60             SkBlurImageFilter::Make(5, 5, nullptr),
  61             SkDropShadowImageFilter::Make(10, 10, 3, 3, SK_ColorGREEN,
  62                 SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
  63                 nullptr),
  64             SkOffsetImageFilter::Make(-16, 32, nullptr),
  65             SkImageFilter::MakeMatrixFilter(resizeMatrix, kNone_SkFilterQuality, nullptr),
  66         };
  67
  68         SkRect r = SkRect::MakeWH(64, 64);
  69         SkScalar margin = 32;
  70         SkPaint paint;
  71         paint.setColor(SK_ColorWHITE);
  72         paint.setAntiAlias(true);
  73         paint.setStrokeWidth(10);
  74         paint.setStyle(SkPaint::kStroke_Style);
  75         paint.setTextSize(48);
  76         paint.setTextAlign(SkPaint::kCenter_Align);
  77
  78         for (size_t i = 0; i < SK_ARRAY_COUNT(drawProc); ++i) {
  79             canvas->translate(0, margin);
  80             canvas->save();
  81             for (size_t j = 0; j < SK_ARRAY_COUNT(filters); ++j) {
  82                 canvas->translate(margin, 0);
  83                 canvas->save();
  84                 if (2 == j) {
  85                     canvas->translate(16, -32);
  86                 } else if (3 == j) {
  87                     canvas->scale(SkScalarInvert(RESIZE_FACTOR_X),
  88                                   SkScalarInvert(RESIZE_FACTOR_Y));
  89                 }
  90                 paint.setImageFilter(filters[j]);
  91                 drawProc[i](canvas, r, paint);
  92                 canvas->restore();
  93                 canvas->translate(r.width() + margin, 0);
  94             }
  95             canvas->restore();
  96             canvas->translate(0, r.height());
  97         }
  98     }
  99
 100 private:
 101     typedef GM INHERITED;
 102 };
 103
 104 //////////////////////////////////////////////////////////////////////////////
 105
 106 DEF_GM(return new ImageFiltersStrokedGM;)
 107
 108 }