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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 
fill_rect_filtered(SkCanvas * canvas,const SkRect & clipRect,sk_sp<SkImageFilter> filter)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:
ImageSourceGM()29     ImageSourceGM() { }
30 
31 protected:
onShortName()32     SkString onShortName() override {
33         return SkString("imagesource");
34     }
35 
onISize()36     SkISize onISize() override { return SkISize::Make(500, 150); }
37 
onOnceBeforeDraw()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 
onDraw(SkCanvas * canvas)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; )
88