gm/imageblurtiled.cpp

   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 "gm.h"
   9 #include "sk_tool_utils.h"
  10 #include "SkBlurImageFilter.h"
  11 #include "SkRandom.h"
  12
  13 #define WIDTH 640
  14 #define HEIGHT 480
  15
  16 namespace skiagm {
  17
  18 class ImageBlurTiledGM : public GM {
  19 public:
  20     ImageBlurTiledGM(SkScalar sigmaX, SkScalar sigmaY)
  21         : fSigmaX(sigmaX), fSigmaY(sigmaY) {
  22     }
  23
  24 protected:
  25     SkString onShortName() override {
  26         return SkString("imageblurtiled");
  27     }
  28
  29     SkISize onISize() override {
  30         return SkISize::Make(WIDTH, HEIGHT);
  31     }
  32
  33     void onDraw(SkCanvas* canvas) override {
  34         SkPaint paint;
  35         paint.setImageFilter(SkBlurImageFilter::Make(fSigmaX, fSigmaY, nullptr));
  36         const SkScalar tileSize = SkIntToScalar(128);
  37         SkRect bounds = canvas->getLocalClipBounds();
  38         for (SkScalar y = bounds.top(); y < bounds.bottom(); y += tileSize) {
  39             for (SkScalar x = bounds.left(); x < bounds.right(); x += tileSize) {
  40                 canvas->save();
  41                 canvas->clipRect(SkRect::MakeXYWH(x, y, tileSize, tileSize));
  42                 canvas->saveLayer(nullptr, &paint);
  43                 const char* str[] = {
  44                     "The quick",
  45                     "brown fox",
  46                     "jumped over",
  47                     "the lazy dog.",
  48                 };
  49                 SkPaint textPaint;
  50                 textPaint.setAntiAlias(true);
  51                 sk_tool_utils::set_portable_typeface(&textPaint);
  52                 textPaint.setTextSize(SkIntToScalar(100));
  53                 int posY = 0;
  54                 for (unsigned i = 0; i < SK_ARRAY_COUNT(str); i++) {
  55                     posY += 100;
  56                     canvas->drawString(str[i], SkIntToScalar(0),
  57                                      SkIntToScalar(posY), textPaint);
  58                 }
  59                 canvas->restore();
  60                 canvas->restore();
  61             }
  62         }
  63     }
  64
  65 private:
  66     SkScalar fSigmaX;
  67     SkScalar fSigmaY;
  68
  69     typedef GM INHERITED;
  70 };
  71
  72 //////////////////////////////////////////////////////////////////////////////
  73
  74 DEF_GM(return new  ImageBlurTiledGM(3.0f, 3.0f);)
  75
  76 }