downsamplebitmap.cpp revision 36352bf5e38f45a70ee4f4fc132a38048d38206d 
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
10#include "Resources.h"
11#include "SkGradientShader.h"
12#include "SkTypeface.h"
13#include "SkImageDecoder.h"
14#include "SkStream.h"
15#include "SkPaint.h"
16
17static void make_checker(SkBitmap* bm, int size, int numChecks) {
18    bm->allocN32Pixels(size, size);
19    for (int y = 0; y < size; ++y) {
20        for (int x = 0; x < size; ++x) {
21            SkPMColor* s = bm->getAddr32(x, y);
22            int cx = (x * numChecks) / size;
23            int cy = (y * numChecks) / size;
24            if ((cx+cy)%2) {
25                *s = 0xFFFFFFFF;
26            } else {
27                *s = 0xFF000000;
28            }
29        }
30    }
31}
32
33static void setTypeface(SkPaint* paint, const char name[], SkTypeface::Style style) {
34    sk_tool_utils::set_portable_typeface(paint, name, style);
35}
36
37class DownsampleBitmapGM : public skiagm::GM {
38public:
39    SkBitmap    fBM;
40    SkString    fName;
41    bool        fBitmapMade;
42    SkFilterQuality fFilterQuality;
43
44    DownsampleBitmapGM(SkFilterQuality filterQuality)
45        : fFilterQuality(filterQuality)
46    {
47        this->setBGColor(0xFFDDDDDD);
48        fBitmapMade = false;
49    }
50
51    const char* filterQualityToString() {
52        static const char *filterQualityNames[] = {
53            "none", "low", "medium", "high"
54        };
55        return filterQualityNames[fFilterQuality];
56    }
57
58protected:
59
60    SkString onShortName() override {
61        return fName;
62    }
63
64    SkISize onISize() override {
65        make_bitmap_wrapper();
66        return SkISize::Make(fBM.width(), 4 * fBM.height());
67    }
68
69    void make_bitmap_wrapper() {
70        if (!fBitmapMade) {
71            fBitmapMade = true;
72            make_bitmap();
73        }
74    }
75
76    virtual void make_bitmap() = 0;
77
78    void onDraw(SkCanvas* canvas) override {
79        make_bitmap_wrapper();
80
81        int curY = 0;
82        int curHeight;
83        float curScale = 1;
84        do {
85
86            SkMatrix matrix;
87            matrix.setScale( curScale, curScale );
88
89            SkPaint paint;
90            paint.setFilterQuality(fFilterQuality);
91
92            canvas->save();
93            canvas->translate(0, (SkScalar)curY);
94            canvas->concat(matrix);
95            canvas->drawBitmap(fBM, 0, 0, &paint);
96            canvas->restore();
97
98            curHeight = (int) (fBM.height() * curScale + 2);
99            curY += curHeight;
100            curScale *= 0.75f;
101        } while (curHeight >= 2 && curY < 4*fBM.height());
102    }
103
104private:
105    typedef skiagm::GM INHERITED;
106};
107
108class DownsampleBitmapTextGM: public DownsampleBitmapGM {
109  public:
110      DownsampleBitmapTextGM(float textSize, SkFilterQuality filterQuality)
111      : INHERITED(filterQuality), fTextSize(textSize)
112        {
113            fName.printf("downsamplebitmap_text_%s_%.2fpt", this->filterQualityToString(), fTextSize);
114        }
115
116  protected:
117      float fTextSize;
118
119      void make_bitmap() override {
120          fBM.allocN32Pixels(int(fTextSize * 8), int(fTextSize * 6));
121          SkCanvas canvas(fBM);
122          canvas.drawColor(SK_ColorWHITE);
123
124          SkPaint paint;
125          paint.setAntiAlias(true);
126          paint.setSubpixelText(true);
127          paint.setTextSize(fTextSize);
128
129          setTypeface(&paint, "Times", SkTypeface::kNormal);
130          canvas.drawText("Hamburgefons", 12, fTextSize/2, 1.2f*fTextSize, paint);
131          setTypeface(&paint, "Times", SkTypeface::kBold);
132          canvas.drawText("Hamburgefons", 12, fTextSize/2, 2.4f*fTextSize, paint);
133          setTypeface(&paint, "Times", SkTypeface::kItalic);
134          canvas.drawText("Hamburgefons", 12, fTextSize/2, 3.6f*fTextSize, paint);
135          setTypeface(&paint, "Times", SkTypeface::kBoldItalic);
136          canvas.drawText("Hamburgefons", 12, fTextSize/2, 4.8f*fTextSize, paint);
137      }
138  private:
139      typedef DownsampleBitmapGM INHERITED;
140};
141
142class DownsampleBitmapCheckerboardGM: public DownsampleBitmapGM {
143  public:
144      DownsampleBitmapCheckerboardGM(int size, int numChecks, SkFilterQuality filterQuality)
145      : INHERITED(filterQuality), fSize(size), fNumChecks(numChecks)
146        {
147            fName.printf("downsamplebitmap_checkerboard_%s_%d_%d", this->filterQualityToString(), fSize, fNumChecks);
148        }
149
150  protected:
151      int fSize;
152      int fNumChecks;
153
154      void make_bitmap() override {
155          make_checker(&fBM, fSize, fNumChecks);
156      }
157  private:
158      typedef DownsampleBitmapGM INHERITED;
159};
160
161class DownsampleBitmapImageGM: public DownsampleBitmapGM {
162  public:
163      DownsampleBitmapImageGM(const char filename[], SkFilterQuality filterQuality)
164      : INHERITED(filterQuality), fFilename(filename)
165        {
166            fName.printf("downsamplebitmap_image_%s_%s", this->filterQualityToString(), filename);
167        }
168
169  protected:
170      SkString fFilename;
171      int fSize;
172
173      void make_bitmap() override {
174          SkImageDecoder* codec = NULL;
175          SkString resourcePath = GetResourcePath(fFilename.c_str());
176          SkFILEStream stream(resourcePath.c_str());
177          if (stream.isValid()) {
178              codec = SkImageDecoder::Factory(&stream);
179          }
180          if (codec) {
181              stream.rewind();
182              codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
183              SkDELETE(codec);
184          } else {
185              fBM.allocN32Pixels(1, 1);
186              *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
187          }
188          fSize = fBM.height();
189      }
190  private:
191      typedef DownsampleBitmapGM INHERITED;
192};
193
194#include "SkMipMap.h"
195
196static void release_mipmap(void*, void* context) {
197    ((SkMipMap*)context)->unref();
198}
199
200class ShowMipLevels : public skiagm::GM {
201public:
202    SkBitmap    fBM;
203
204    ShowMipLevels() {
205        this->setBGColor(0xFFDDDDDD);
206        make_checker(&fBM, 512, 256);
207    }
208
209protected:
210
211    SkString onShortName() override {
212        return SkString("showmiplevels");
213    }
214
215    SkISize onISize() override {
216        return SkISize::Make(fBM.width() + 8, 2 * fBM.height() + 80);
217    }
218
219    void onDraw(SkCanvas* canvas) override {
220        SkScalar x = 4;
221        SkScalar y = 4;
222        canvas->drawBitmap(fBM, x, y, NULL);
223        y += fBM.height() + 4;
224
225        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(fBM, NULL));
226
227        SkMipMap::Level level;
228        SkScalar scale = 0.5f;
229        while (mm->extractLevel(scale, &level)) {
230            SkImageInfo info = SkImageInfo::MakeN32Premul(level.fWidth, level.fHeight);
231            SkBitmap bm;
232            bm.installPixels(info, level.fPixels, level.fRowBytes, NULL,
233                             &release_mipmap, (void*)(SkRef(mm.get())));
234            bm.setImmutable();
235            canvas->drawBitmap(bm, x, y, NULL);
236            y += bm.height() + 4;
237            scale /= 2;
238            if (info.width() == 1 || info.height() == 1) {
239                break;
240            }
241        }
242    }
243
244private:
245    typedef skiagm::GM INHERITED;
246};
247DEF_GM( return new ShowMipLevels; )
248
249//////////////////////////////////////////////////////////////////////////////
250
251DEF_GM( return new DownsampleBitmapTextGM(72, kHigh_SkFilterQuality); )
252DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kHigh_SkFilterQuality); )
253DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kHigh_SkFilterQuality); )
254DEF_GM( return new DownsampleBitmapImageGM("mandrill_132x132_12x12.astc",
255                                            kHigh_SkFilterQuality); )
256
257DEF_GM( return new DownsampleBitmapTextGM(72, kMedium_SkFilterQuality); )
258DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kMedium_SkFilterQuality); )
259DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kMedium_SkFilterQuality); )
260DEF_GM( return new DownsampleBitmapImageGM("mandrill_132x132_12x12.astc",
261                                           kMedium_SkFilterQuality); )
262
263DEF_GM( return new DownsampleBitmapTextGM(72, kLow_SkFilterQuality); )
264DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kLow_SkFilterQuality); )
265DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kLow_SkFilterQuality); )
266DEF_GM( return new DownsampleBitmapImageGM("mandrill_132x132_12x12.astc",
267                                           kLow_SkFilterQuality); )
268
269DEF_GM( return new DownsampleBitmapTextGM(72, kNone_SkFilterQuality); )
270DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kNone_SkFilterQuality); )
271DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kNone_SkFilterQuality); )
272DEF_GM( return new DownsampleBitmapImageGM("mandrill_132x132_12x12.astc",
273                                           kNone_SkFilterQuality); )
274