submodule/skia/gm/ninepatchstretch.cpp

   1 /*
   2  * Copyright 2011 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/gm.h"
   9 #include "include/core/SkBitmap.h"
  10 #include "include/core/SkCanvas.h"
  11 #include "include/core/SkImage.h"
  12 #include "include/core/SkImageInfo.h"
  13 #include "include/core/SkPaint.h"
  14 #include "include/core/SkRect.h"
  15 #include "include/core/SkRefCnt.h"
  16 #include "include/core/SkScalar.h"
  17 #include "include/core/SkSize.h"
  18 #include "include/core/SkString.h"
  19 #include "include/core/SkSurface.h"
  20 #include "tools/ToolUtils.h"
  21
  22 static sk_sp<SkSurface> make_surface(SkCanvas* root, int N) {
  23     SkImageInfo info = SkImageInfo::MakeN32Premul(N, N);
  24     return ToolUtils::makeSurface(root, info);
  25 }
  26
  27 static sk_sp<SkImage> make_image(SkCanvas* root, SkIRect* center) {
  28     const int kFixed = 28;
  29     const int kStretchy = 8;
  30     const int kSize = 2*kFixed + kStretchy;
  31
  32     auto surface(make_surface(root, kSize));
  33     SkCanvas* canvas = surface->getCanvas();
  34
  35     SkRect r = SkRect::MakeWH(SkIntToScalar(kSize), SkIntToScalar(kSize));
  36     const SkScalar strokeWidth = SkIntToScalar(6);
  37     const SkScalar radius = SkIntToScalar(kFixed) - strokeWidth/2;
  38
  39     center->setXYWH(kFixed, kFixed, kStretchy, kStretchy);
  40
  41     SkPaint paint;
  42     paint.setAntiAlias(true);
  43
  44     paint.setColor(0xFFFF0000);
  45     canvas->drawRoundRect(r, radius, radius, paint);
  46     r.setXYWH(SkIntToScalar(kFixed), 0, SkIntToScalar(kStretchy), SkIntToScalar(kSize));
  47     paint.setColor(0x8800FF00);
  48     canvas->drawRect(r, paint);
  49     r.setXYWH(0, SkIntToScalar(kFixed), SkIntToScalar(kSize), SkIntToScalar(kStretchy));
  50     paint.setColor(0x880000FF);
  51     canvas->drawRect(r, paint);
  52
  53     return surface->makeImageSnapshot();
  54 }
  55
  56 class NinePatchStretchGM : public skiagm::GM {
  57 public:
  58     sk_sp<SkImage>  fImage;
  59     SkIRect         fCenter;
  60
  61     NinePatchStretchGM() {}
  62
  63 protected:
  64     SkString onShortName() override {
  65         return SkString("ninepatch-stretch");
  66     }
  67
  68     SkISize onISize() override {
  69         return SkISize::Make(760, 800);
  70     }
  71
  72     void onDraw(SkCanvas* canvas) override {
  73         if (!fImage || !fImage->isValid(canvas->recordingContext())) {
  74             fImage = make_image(canvas, &fCenter);
  75         }
  76
  77         // amount of bm that should not be stretched (unless we have to)
  78         const SkScalar fixed = SkIntToScalar(fImage->width() - fCenter.width());
  79
  80         const SkSize size[] = {
  81             { fixed * 4 / 5, fixed * 4 / 5 },   // shrink in both axes
  82             { fixed * 4 / 5, fixed * 4 },       // shrink in X
  83             { fixed * 4,     fixed * 4 / 5 },   // shrink in Y
  84             { fixed * 4,     fixed * 4 }
  85         };
  86
  87         canvas->drawImage(fImage, 10, 10);
  88
  89         SkScalar x = SkIntToScalar(100);
  90         SkScalar y = SkIntToScalar(100);
  91
  92         SkPaint paint;
  93         for (auto fm : {SkFilterMode::kLinear, SkFilterMode::kNearest}) {
  94             for (int iy = 0; iy < 2; ++iy) {
  95                 for (int ix = 0; ix < 2; ++ix) {
  96                     int i = ix * 2 + iy;
  97                     SkRect r = SkRect::MakeXYWH(x + ix * fixed, y + iy * fixed,
  98                                                 size[i].width(), size[i].height());
  99                     canvas->drawImageNine(fImage.get(), fCenter, r, fm);
 100                 }
 101             }
 102             canvas->translate(0, 400);
 103         }
 104     }
 105
 106 private:
 107     using INHERITED = skiagm::GM;
 108 };
 109 DEF_GM( return new NinePatchStretchGM; )