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1 /*
2  * Copyright 2015 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/SkColorSpace.h"
13 #include "include/core/SkData.h"
14 #include "include/core/SkEncodedImageFormat.h"
15 #include "include/core/SkImage.h"
16 #include "include/core/SkImageInfo.h"
17 #include "include/core/SkMatrix.h"
18 #include "include/core/SkPaint.h"
19 #include "include/core/SkPicture.h"
20 #include "include/core/SkPictureRecorder.h"
21 #include "include/core/SkRect.h"
22 #include "include/core/SkRefCnt.h"
23 #include "include/core/SkShader.h"
24 #include "include/core/SkSize.h"
25 #include "include/core/SkString.h"
26 #include "include/core/SkSurface.h"
27 #include "include/core/SkTileMode.h"
28 #include "include/core/SkTypes.h"
29 
30 #include <utility>
31 
draw_something(SkCanvas * canvas,const SkRect & bounds)32 static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
33     SkPaint paint;
34     paint.setAntiAlias(true);
35     paint.setColor(SK_ColorRED);
36     paint.setStyle(SkPaint::kStroke_Style);
37     paint.setStrokeWidth(10);
38     canvas->drawRect(bounds, paint);
39     paint.setStyle(SkPaint::kFill_Style);
40     paint.setColor(SK_ColorBLUE);
41     canvas->drawOval(bounds, paint);
42 }
43 
44 typedef sk_sp<SkImage> (*ImageMakerProc)(GrRecordingContext*, SkPicture*, const SkImageInfo&);
45 
make_raster(GrRecordingContext *,SkPicture * pic,const SkImageInfo & info)46 static sk_sp<SkImage> make_raster(GrRecordingContext*,
47                                   SkPicture* pic,
48                                   const SkImageInfo& info) {
49     auto surface(SkSurface::MakeRaster(info));
50     surface->getCanvas()->clear(0);
51     surface->getCanvas()->drawPicture(pic);
52     return surface->makeImageSnapshot();
53 }
54 
make_texture(GrRecordingContext * ctx,SkPicture * pic,const SkImageInfo & info)55 static sk_sp<SkImage> make_texture(GrRecordingContext* ctx,
56                                    SkPicture* pic,
57                                    const SkImageInfo& info) {
58     if (!ctx) {
59         return nullptr;
60     }
61     auto surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info));
62     if (!surface) {
63         return nullptr;
64     }
65     surface->getCanvas()->clear(0);
66     surface->getCanvas()->drawPicture(pic);
67     return surface->makeImageSnapshot();
68 }
69 
make_pict_gen(GrRecordingContext *,SkPicture * pic,const SkImageInfo & info)70 static sk_sp<SkImage> make_pict_gen(GrRecordingContext*,
71                                     SkPicture* pic,
72                                     const SkImageInfo& info) {
73     return SkImage::MakeFromPicture(sk_ref_sp(pic), info.dimensions(), nullptr, nullptr,
74                                     SkImage::BitDepth::kU8,
75                                     SkColorSpace::MakeSRGB());
76 }
77 
make_encode_gen(GrRecordingContext * ctx,SkPicture * pic,const SkImageInfo & info)78 static sk_sp<SkImage> make_encode_gen(GrRecordingContext* ctx,
79                                       SkPicture* pic,
80                                       const SkImageInfo& info) {
81     sk_sp<SkImage> src(make_raster(ctx, pic, info));
82     if (!src) {
83         return nullptr;
84     }
85     sk_sp<SkData> encoded = src->encodeToData(SkEncodedImageFormat::kPNG, 100);
86     if (!encoded) {
87         return nullptr;
88     }
89     return SkImage::MakeFromEncoded(std::move(encoded));
90 }
91 
92 const ImageMakerProc gProcs[] = {
93     make_raster,
94     make_texture,
95     make_pict_gen,
96     make_encode_gen,
97 };
98 
99 /*
100  *  Exercise drawing pictures inside an image, showing that the image version is pixelated
101  *  (correctly) when it is inside an image.
102  */
103 class ImageShaderGM : public skiagm::GM {
104     sk_sp<SkPicture> fPicture;
105 
106 public:
ImageShaderGM()107     ImageShaderGM() {}
108 
109 protected:
onShortName()110     SkString onShortName() override {
111         return SkString("image-shader");
112     }
113 
onISize()114     SkISize onISize() override {
115         return SkISize::Make(850, 450);
116     }
117 
onOnceBeforeDraw()118     void onOnceBeforeDraw() override {
119         const SkRect bounds = SkRect::MakeWH(100, 100);
120         SkPictureRecorder recorder;
121         draw_something(recorder.beginRecording(bounds), bounds);
122         fPicture = recorder.finishRecordingAsPicture();
123     }
124 
testImage(SkCanvas * canvas,SkImage * image)125     void testImage(SkCanvas* canvas, SkImage* image) {
126         SkAutoCanvasRestore acr(canvas, true);
127 
128         canvas->drawImage(image, 0, 0);
129         canvas->translate(0, 120);
130 
131         const SkTileMode tile = SkTileMode::kRepeat;
132         const SkMatrix localM = SkMatrix::Translate(-50, -50);
133         SkPaint paint;
134         paint.setShader(image->makeShader(tile, tile, SkSamplingOptions(), &localM));
135         paint.setAntiAlias(true);
136         canvas->drawCircle(50, 50, 50, paint);
137     }
138 
onDraw(SkCanvas * canvas)139     void onDraw(SkCanvas* canvas) override {
140         canvas->translate(20, 20);
141 
142         const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
143 
144         for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
145             sk_sp<SkImage> image(gProcs[i](canvas->recordingContext(), fPicture.get(), info));
146             if (image) {
147                 this->testImage(canvas, image.get());
148             }
149             canvas->translate(120, 0);
150         }
151     }
152 
153 private:
154     using INHERITED = skiagm::GM;
155 };
DEF_GM(return new ImageShaderGM;)156 DEF_GM( return new ImageShaderGM; )
157 
158 //////////////////////////////////////////////////////////////////////////////////////////////
159 
160 #include "tools/ToolUtils.h"
161 
162 static sk_sp<SkImage> make_checker_img(int w, int h, SkColor c0, SkColor c1, int size) {
163     SkBitmap bm = ToolUtils::create_checkerboard_bitmap(w, h, c0, c1, size);
164     bm.setImmutable();
165     return bm.asImage();
166 }
167 
168 DEF_SIMPLE_GM(drawimage_sampling, canvas, 500, 500) {
169     constexpr int N = 256;
170     constexpr float kScale = 1.0f/6;
171     const SkRect dst = {0, 0, kScale*N, kScale*N};
172 
173     auto img = make_checker_img(N, N, SK_ColorBLACK, SK_ColorWHITE, 7)->withDefaultMipmaps();
174     const SkRect src = SkRect::MakeIWH(img->width(), img->height());
175 
176     SkMatrix mx = SkMatrix::RectToRect(src, dst);
177 
178     SkPaint paint;
179 
180     for (auto mm : {SkMipmapMode::kNone, SkMipmapMode::kNearest, SkMipmapMode::kLinear}) {
181         for (auto fm : {SkFilterMode::kNearest, SkFilterMode::kLinear}) {
182             SkSamplingOptions sampling(fm, mm);
183 
184             canvas->save();
185 
186             canvas->save();
187             canvas->concat(mx);
188             canvas->drawImage(img.get(), 0, 0, sampling);
189             canvas->restore();
190 
191             canvas->translate(dst.width() + 4, 0);
192 
193             paint.setShader(img->makeShader(SkTileMode::kClamp, SkTileMode::kClamp, sampling, &mx));
194             canvas->drawRect(dst, paint);
195 
196             canvas->translate(dst.width() + 4, 0);
197 
198             canvas->drawImageRect(img.get(), src, dst, sampling, nullptr,
199                                   SkCanvas::kFast_SrcRectConstraint);
200             canvas->restore();
201 
202             canvas->translate(0, dst.height() + 8);
203         }
204     }
205 
206 }
207