gm/bitmapsource.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
  10 #include "SkBitmapSource.h"
  11
  12 // This GM exercises the SkBitmapSource ImageFilter class.
  13
  14 class BitmapSourceGM : public skiagm::GM {
  15 public:
  16     BitmapSourceGM() {
  17     }
  18
  19 protected:
  20     SkString onShortName() override {
  21         return SkString("bitmapsource");
  22     }
  23
  24     void makeBitmap() {
  25         fBitmap.allocN32Pixels(100, 100);
  26         SkCanvas canvas(fBitmap);
  27         canvas.clear(0x00000000);
  28         SkPaint paint;
  29         paint.setAntiAlias(true);
  30         sk_tool_utils::set_portable_typeface(&paint);
  31         paint.setColor(0xFFFFFFFF);
  32         paint.setTextSize(SkIntToScalar(96));
  33         const char* str = "e";
  34         canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
  35     }
  36
  37     SkISize onISize() override { return SkISize::Make(500, 150); }
  38
  39     void onOnceBeforeDraw() override {
  40         this->makeBitmap();
  41     }
  42
  43     static void fillRectFiltered(SkCanvas* canvas, const SkRect& clipRect, SkImageFilter* filter) {
  44         SkPaint paint;
  45         paint.setImageFilter(filter);
  46         canvas->save();
  47         canvas->clipRect(clipRect);
  48         canvas->drawPaint(paint);
  49         canvas->restore();
  50     }
  51
  52     void onDraw(SkCanvas* canvas) override {
  53         canvas->clear(0x00000000);
  54         {
  55             SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
  56             SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
  57             SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100);
  58             SkRect bounds;
  59             fBitmap.getBounds(&bounds);
  60             SkAutoTUnref<SkImageFilter> bitmapSource(SkBitmapSource::Create(fBitmap));
  61             SkAutoTUnref<SkImageFilter> bitmapSourceSrcRect(SkBitmapSource::Create(fBitmap, srcRect, srcRect));
  62             SkAutoTUnref<SkImageFilter> bitmapSourceSrcRectDstRect(SkBitmapSource::Create(fBitmap, srcRect, dstRect));
  63             SkAutoTUnref<SkImageFilter> bitmapSourceDstRectOnly(SkBitmapSource::Create(fBitmap, bounds, dstRect));
  64
  65             // Draw an unscaled bitmap.
  66             fillRectFiltered(canvas, clipRect, bitmapSource);
  67             canvas->translate(SkIntToScalar(100), 0);
  68
  69             // Draw an unscaled subset of the source bitmap (srcRect -> srcRect).
  70             fillRectFiltered(canvas, clipRect, bitmapSourceSrcRect);
  71             canvas->translate(SkIntToScalar(100), 0);
  72
  73             // Draw a subset of the bitmap scaled to a destination rect (srcRect -> dstRect).
  74             fillRectFiltered(canvas, clipRect, bitmapSourceSrcRectDstRect);
  75             canvas->translate(SkIntToScalar(100), 0);
  76
  77             // Draw the entire bitmap scaled to a destination rect (bounds -> dstRect).
  78             fillRectFiltered(canvas, clipRect, bitmapSourceDstRectOnly);
  79             canvas->translate(SkIntToScalar(100), 0);
  80         }
  81     }
  82
  83 private:
  84     SkBitmap fBitmap;
  85     typedef GM INHERITED;
  86 };
  87
  88 ///////////////////////////////////////////////////////////////////////////////
  89
  90 DEF_GM( return new BitmapSourceGM; )