gm/imagesource.cpp

   1 /*
   2  * Copyright 2013 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
  11 #include "SkImage.h"
  12 #include "SkImageSource.h"
  13
  14 // This GM exercises the SkImageSource ImageFilter class.
  15
  16 static void fill_rect_filtered(SkCanvas* canvas,
  17                                const SkRect& clipRect,
  18                                sk_sp<SkImageFilter> filter) {
  19     SkPaint paint;
  20     paint.setImageFilter(std::move(filter));
  21     canvas->save();
  22     canvas->clipRect(clipRect);
  23     canvas->drawPaint(paint);
  24     canvas->restore();
  25 }
  26
  27 class ImageSourceGM : public skiagm::GM {
  28 public:
  29     ImageSourceGM() { }
  30
  31 protected:
  32     SkString onShortName() override {
  33         return SkString("imagesource");
  34     }
  35
  36     SkISize onISize() override { return SkISize::Make(500, 150); }
  37
  38     void onOnceBeforeDraw() override {
  39         SkBitmap bm = sk_tool_utils::create_string_bitmap(100, 100, 0xFFFFFFFF, 20, 70, 96, "e");
  40         fImage = SkImage::MakeFromBitmap(bm);
  41     }
  42
  43     void onDraw(SkCanvas* canvas) override {
  44         canvas->clear(SK_ColorBLACK);
  45
  46         const SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
  47         const SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
  48         const SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100);
  49         const SkRect bounds = SkRect::MakeIWH(fImage->width(), fImage->height());
  50
  51         {
  52             // Draw an unscaled bitmap.
  53             sk_sp<SkImageFilter> imageSource(SkImageSource::Make(fImage));
  54             fill_rect_filtered(canvas, clipRect, std::move(imageSource));
  55             canvas->translate(SkIntToScalar(100), 0);
  56         }
  57         {
  58             // Draw an unscaled subset of the source bitmap (srcRect -> srcRect).
  59             sk_sp<SkImageFilter> imageSourceSrcRect(
  60                 SkImageSource::Make(fImage, srcRect, srcRect, kHigh_SkFilterQuality));
  61             fill_rect_filtered(canvas, clipRect, std::move(imageSourceSrcRect));
  62             canvas->translate(SkIntToScalar(100), 0);
  63         }
  64         {
  65             // Draw a subset of the bitmap scaled to a destination rect (srcRect -> dstRect).
  66             sk_sp<SkImageFilter> imageSourceSrcRectDstRect(
  67                 SkImageSource::Make(fImage, srcRect, dstRect, kHigh_SkFilterQuality));
  68             fill_rect_filtered(canvas, clipRect, std::move(imageSourceSrcRectDstRect));
  69             canvas->translate(SkIntToScalar(100), 0);
  70         }
  71         {
  72             // Draw the entire bitmap scaled to a destination rect (bounds -> dstRect).
  73             sk_sp<SkImageFilter> imageSourceDstRectOnly(
  74                 SkImageSource::Make(fImage, bounds, dstRect, kHigh_SkFilterQuality));
  75             fill_rect_filtered(canvas, clipRect, std::move(imageSourceDstRectOnly));
  76             canvas->translate(SkIntToScalar(100), 0);
  77         }
  78     }
  79
  80 private:
  81     sk_sp<SkImage> fImage;
  82     typedef GM INHERITED;
  83 };
  84
  85 ///////////////////////////////////////////////////////////////////////////////
  86
  87 DEF_GM( return new ImageSourceGM; )