gm/morphology.cpp

   1 /*
   2  * Copyright 2012 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 "SkMorphologyImageFilter.h"
  11
  12 #define WIDTH 700
  13 #define HEIGHT 560
  14
  15 namespace skiagm {
  16
  17 class MorphologyGM : public GM {
  18 public:
  19     MorphologyGM() {
  20         this->setBGColor(0xFF000000);
  21     }
  22
  23 protected:
  24     SkString onShortName() override {
  25         return SkString("morphology");
  26     }
  27
  28     void onOnceBeforeDraw() override {
  29         fBitmap.allocN32Pixels(135, 135);
  30         SkCanvas canvas(fBitmap);
  31         canvas.clear(0x0);
  32         SkPaint paint;
  33         paint.setAntiAlias(true);
  34         sk_tool_utils::set_portable_typeface(&paint);
  35         const char* str1 = "ABC";
  36         const char* str2 = "XYZ";
  37         paint.setColor(0xFFFFFFFF);
  38         paint.setTextSize(64);
  39         canvas.drawString(str1, 10, 55, paint);
  40         canvas.drawString(str2, 10, 110, paint);
  41     }
  42
  43     SkISize onISize() override {
  44         return SkISize::Make(WIDTH, HEIGHT);
  45     }
  46
  47     void drawClippedBitmap(SkCanvas* canvas, const SkPaint& paint, int x, int y) {
  48         canvas->save();
  49         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
  50         canvas->clipRect(SkRect::MakeWH(
  51           SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
  52         canvas->drawBitmap(fBitmap, 0, 0, &paint);
  53         canvas->restore();
  54     }
  55
  56     void onDraw(SkCanvas* canvas) override {
  57         struct {
  58             int fWidth, fHeight;
  59             int fRadiusX, fRadiusY;
  60         } samples[] = {
  61             { 140, 140,   0,   0 },
  62             { 140, 140,   0,   2 },
  63             { 140, 140,   2,   0 },
  64             { 140, 140,   2,   2 },
  65             {  24,  24,  25,  25 },
  66         };
  67         SkPaint paint;
  68         SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(25, 20, 100, 80));
  69
  70         for (unsigned j = 0; j < 4; ++j) {
  71             for (unsigned i = 0; i < SK_ARRAY_COUNT(samples); ++i) {
  72                 const SkImageFilter::CropRect* cr = j & 0x02 ? &cropRect : nullptr;
  73                 if (j & 0x01) {
  74                     paint.setImageFilter(SkErodeImageFilter::Make(samples[i].fRadiusX,
  75                                                                   samples[i].fRadiusY,
  76                                                                   nullptr,
  77                                                                   cr));
  78                 } else {
  79                     paint.setImageFilter(SkDilateImageFilter::Make(samples[i].fRadiusX,
  80                                                                    samples[i].fRadiusY,
  81                                                                    nullptr,
  82                                                                    cr));
  83                 }
  84                 this->drawClippedBitmap(canvas, paint, i * 140, j * 140);
  85             }
  86         }
  87     }
  88
  89 private:
  90     SkBitmap fBitmap;
  91
  92     typedef GM INHERITED;
  93 };
  94
  95 //////////////////////////////////////////////////////////////////////////////
  96
  97 DEF_GM(return new MorphologyGM;)
  98
  99 }