1 /*
2 * Copyright 2017 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/SkColorPriv.h"
13 #include "include/core/SkImage.h"
14 #include "include/core/SkImageFilter.h"
15 #include "include/core/SkImageInfo.h"
16 #include "include/core/SkPaint.h"
17 #include "include/core/SkPoint.h"
18 #include "include/core/SkRect.h"
19 #include "include/core/SkRefCnt.h"
20 #include "include/core/SkSize.h"
21 #include "include/core/SkString.h"
22 #include "include/core/SkSurface.h"
23 #include "include/core/SkTypes.h"
24 #include "include/effects/SkImageFilters.h"
25 #include "include/gpu/GrTypes.h"
26
27 #include <utility>
28
29 class GrContext;
30
make_image(GrContext * context,int size,GrSurfaceOrigin origin)31 static sk_sp<SkImage> make_image(GrContext* context, int size, GrSurfaceOrigin origin) {
32 if (context) {
33 SkImageInfo ii = SkImageInfo::Make(size, size, kN32_SkColorType, kPremul_SkAlphaType);
34 sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(context, SkBudgeted::kYes, ii, 0,
35 origin, nullptr));
36 if (surf) {
37 SkCanvas* canvas = surf->getCanvas();
38
39 canvas->clear(SK_ColorRED);
40 const struct {
41 SkPoint fPt;
42 SkColor fColor;
43 } rec[] = {
44 { { 1.5f, 1.5f }, SK_ColorGREEN },
45 { { 2.5f, 1.5f }, SK_ColorBLUE },
46 { { 1.5f, 2.5f }, SK_ColorCYAN },
47 { { 2.5f, 2.5f }, SK_ColorGRAY },
48 };
49 SkPaint paint;
50 for (const auto& r : rec) {
51 paint.setColor(r.fColor);
52 canvas->drawPoints(SkCanvas::kPoints_PointMode, 1, &r.fPt, paint);
53 }
54 return surf->makeImageSnapshot();
55 }
56 }
57
58 SkBitmap bm;
59 bm.allocN32Pixels(size, size);
60 bm.eraseColor(SK_ColorRED);
61 *bm.getAddr32(1, 1) = SkPackARGB32(0xFF, 0x00, 0xFF, 0x00);
62 *bm.getAddr32(2, 1) = SkPackARGB32(0xFF, 0x00, 0x00, 0xFF);
63 *bm.getAddr32(1, 2) = SkPackARGB32(0xFF, 0x00, 0xFF, 0xFF);
64 *bm.getAddr32(2, 2) = SkPackARGB32(0xFF, 0x88, 0x88, 0x88);
65 return SkImage::MakeFromBitmap(bm);
66 }
67
68 /*
69 * This GM creates an image with a 2x2:
70 * Green | Blue
71 * ------------
72 * Cyan | Gray
73 * block of pixels in one corner of a 33x33 field. The 'srcRect' feature of the
74 * SkMagnifierImageFilter is then used to blow it up with different inset border widths.
75 *
76 * In GPU-mode we wind up drawing 4 rects:
77 *
78 * BottomLeft origin + 1-wide inset | TopLeft origin + 1-wide inset
79 * ----------------------------------------------------------------
80 * BottomLeft origin + 7-wide inset | TopLeft origin + 7-wide inset
81 *
82 * In Raster-mode the source origin isn't used.
83 */
84 class SimpleMagnificationGM : public skiagm::GM {
85 public:
SimpleMagnificationGM()86 SimpleMagnificationGM() {
87 this->setBGColor(0xFFCCCCCC);
88 }
89
90 protected:
onShortName()91 SkString onShortName() override {
92 return SkString("simple-magnification");
93 }
94
onISize()95 SkISize onISize() override {
96 return SkISize::Make(3*kPad+2*kImgSize, 3*kPad+2*kImgSize);
97 }
98
draw(SkCanvas * canvas,sk_sp<SkImage> image,const SkIPoint & offset,int inset)99 void draw(SkCanvas* canvas, sk_sp<SkImage> image, const SkIPoint& offset, int inset) {
100 sk_sp<SkImageFilter> imgSrc(SkImageFilters::Image(std::move(image)));
101
102 SkRect srcRect = SkRect::MakeXYWH(1.0f, 1.0f, 2.0f, 2.0f);
103 sk_sp<SkImageFilter> magFilter(SkImageFilters::Magnifier(srcRect, inset, imgSrc));
104
105 SkPaint paint;
106 paint.setImageFilter(std::move(magFilter));
107
108 canvas->save();
109 canvas->translate(offset.fX, offset.fY);
110 SkRect rect = SkRect::MakeWH(kImgSize, kImgSize);
111 canvas->drawRect(rect, paint);
112
113 canvas->restore();
114 }
115
onDraw(SkCanvas * canvas,SkString * errorMsg)116 DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
117 GrContext* context = canvas->getGrContext();
118
119 sk_sp<SkImage> bottomLImg = make_image(context, kImgSize, kBottomLeft_GrSurfaceOrigin);
120 sk_sp<SkImage> topLImg = make_image(context, kImgSize, kTopLeft_GrSurfaceOrigin);
121 if (!bottomLImg || !topLImg) {
122 *errorMsg = "Could not load images. Did you forget to set the resourcePath?";
123 return DrawResult::kFail;
124 }
125
126 int bigOffset = 2 * kPad + kImgSize;
127
128 this->draw(canvas, bottomLImg, SkIPoint::Make(kPad, kPad), 1);
129 this->draw(canvas, topLImg, SkIPoint::Make(bigOffset, kPad), 1);
130 this->draw(canvas, bottomLImg, SkIPoint::Make(kPad, bigOffset), 7);
131 this->draw(canvas, topLImg, SkIPoint::Make(bigOffset, bigOffset), 7);
132 return DrawResult::kOk;
133 }
134
135 private:
136 static const int kImgSize = 33;
137 static const int kPad = 2;
138
139 typedef skiagm::GM INHERITED;
140 };
141
142 //////////////////////////////////////////////////////////////////////////////
143
144 DEF_GM(return new SimpleMagnificationGM;)
145