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