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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkImage.h"
13 #include "include/core/SkImageFilter.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkRefCnt.h"
17 #include "include/core/SkScalar.h"
18 #include "include/core/SkSize.h"
19 #include "include/core/SkString.h"
20 #include "include/effects/SkImageFilters.h"
21 #include "tools/ToolUtils.h"
22
23 #include <utility>
24
25 // This GM exercises the SkImageSource ImageFilter class.
26
fill_rect_filtered(SkCanvas * canvas,const SkRect & clipRect,sk_sp<SkImageFilter> filter)27 static void fill_rect_filtered(SkCanvas* canvas,
28 const SkRect& clipRect,
29 sk_sp<SkImageFilter> filter) {
30 SkPaint paint;
31 paint.setImageFilter(std::move(filter));
32 canvas->save();
33 canvas->clipRect(clipRect);
34 canvas->drawPaint(paint);
35 canvas->restore();
36 }
37
38 class ImageSourceGM : public skiagm::GM {
39 public:
ImageSourceGM()40 ImageSourceGM() { }
41
42 protected:
onShortName()43 SkString onShortName() override {
44 return SkString("imagesource");
45 }
46
onISize()47 SkISize onISize() override { return SkISize::Make(500, 150); }
48
onOnceBeforeDraw()49 void onOnceBeforeDraw() override {
50 fImage = ToolUtils::create_string_image(100, 100, 0xFFFFFFFF, 20, 70, 96, "e");
51 }
52
onDraw(SkCanvas * canvas)53 void onDraw(SkCanvas* canvas) override {
54 canvas->clear(SK_ColorBLACK);
55
56 const SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
57 const SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
58 const SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100);
59 const SkRect bounds = SkRect::MakeIWH(fImage->width(), fImage->height());
60 const SkSamplingOptions sampling({1/3.0f, 1/3.0f});
61
62 {
63 // Draw an unscaled bitmap.
64 sk_sp<SkImageFilter> imageSource(SkImageFilters::Image(fImage));
65 fill_rect_filtered(canvas, clipRect, std::move(imageSource));
66 canvas->translate(SkIntToScalar(100), 0);
67 }
68 {
69 // Draw an unscaled subset of the source bitmap (srcRect -> srcRect).
70 sk_sp<SkImageFilter> imageSourceSrcRect(
71 SkImageFilters::Image(fImage, srcRect, srcRect, sampling));
72 fill_rect_filtered(canvas, clipRect, std::move(imageSourceSrcRect));
73 canvas->translate(SkIntToScalar(100), 0);
74 }
75 {
76 // Draw a subset of the bitmap scaled to a destination rect (srcRect -> dstRect).
77 sk_sp<SkImageFilter> imageSourceSrcRectDstRect(
78 SkImageFilters::Image(fImage, srcRect, dstRect, sampling));
79 fill_rect_filtered(canvas, clipRect, std::move(imageSourceSrcRectDstRect));
80 canvas->translate(SkIntToScalar(100), 0);
81 }
82 {
83 // Draw the entire bitmap scaled to a destination rect (bounds -> dstRect).
84 sk_sp<SkImageFilter> imageSourceDstRectOnly(
85 SkImageFilters::Image(fImage, bounds, dstRect, sampling));
86 fill_rect_filtered(canvas, clipRect, std::move(imageSourceDstRectOnly));
87 canvas->translate(SkIntToScalar(100), 0);
88 }
89 }
90
91 private:
92 sk_sp<SkImage> fImage;
93 using INHERITED = GM;
94 };
95
96 ///////////////////////////////////////////////////////////////////////////////
97
98 DEF_GM( return new ImageSourceGM; )
99