filterbitmap.cpp revision bfefc7c95fc0e8ebd5000c68f6d16e1a3ea0e71e 
1/*
2 * Copyright 2011 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 "SkGradientShader.h"
10
11#include "SkTypeface.h"
12#include "SkImageDecoder.h"
13#include "SkStream.h"
14
15static void setTypeface(SkPaint* paint, const char name[], SkTypeface::Style style) {
16    SkSafeUnref(paint->setTypeface(SkTypeface::CreateFromName(name, style)));
17}
18
19static SkSize computeSize(const SkBitmap& bm, const SkMatrix& mat) {
20    SkRect bounds = SkRect::MakeWH(SkIntToScalar(bm.width()),
21                                   SkIntToScalar(bm.height()));
22    mat.mapRect(&bounds);
23    return SkSize::Make(bounds.width(), bounds.height());
24}
25
26static void draw_row(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat, SkScalar dx) {
27    SkPaint paint;
28
29    SkAutoCanvasRestore acr(canvas, true);
30
31    canvas->drawBitmapMatrix(bm, mat, &paint);
32
33    paint.setFilterLevel(SkPaint::kLow_FilterLevel);
34    canvas->translate(dx, 0);
35    canvas->drawBitmapMatrix(bm, mat, &paint);
36
37    paint.setFilterLevel(SkPaint::kMedium_FilterLevel);
38    canvas->translate(dx, 0);
39    canvas->drawBitmapMatrix(bm, mat, &paint);
40
41    paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
42    canvas->translate(dx, 0);
43    canvas->drawBitmapMatrix(bm, mat, &paint);
44}
45
46class FilterBitmapGM : public skiagm::GM {
47    void onOnceBeforeDraw() {
48
49        this->makeBitmap();
50
51        SkScalar cx = SkScalarHalf(fBM.width());
52        SkScalar cy = SkScalarHalf(fBM.height());
53        SkScalar scale = this->getScale();
54
55        // these two matrices use a scale factor configured by the subclass
56        fMatrix[0].setScale(scale, scale);
57        fMatrix[1].setRotate(30, cx, cy); fMatrix[1].postScale(scale, scale);
58
59        // up/down scaling mix
60        fMatrix[2].setScale(0.7f, 1.05f);
61    }
62
63public:
64    SkBitmap    fBM;
65    SkMatrix    fMatrix[3];
66    SkString    fName;
67
68    FilterBitmapGM()
69    {
70        this->setBGColor(0xFFDDDDDD);
71    }
72
73protected:
74    virtual uint32_t onGetFlags() const SK_OVERRIDE {
75        return kSkipTiled_Flag;
76    }
77
78    virtual SkString onShortName() SK_OVERRIDE {
79        return fName;
80    }
81
82    virtual SkISize onISize() SK_OVERRIDE {
83        return SkISize::Make(1024, 768);
84    }
85
86    virtual void makeBitmap() = 0;
87    virtual SkScalar getScale() = 0;
88
89    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
90
91        canvas->translate(10, 10);
92        for (size_t i = 0; i < SK_ARRAY_COUNT(fMatrix); ++i) {
93            SkSize size = computeSize(fBM, fMatrix[i]);
94            size.fWidth += 20;
95            size.fHeight += 20;
96
97            draw_row(canvas, fBM, fMatrix[i], size.fWidth);
98            canvas->translate(0, size.fHeight);
99        }
100    }
101
102private:
103    typedef skiagm::GM INHERITED;
104};
105
106class FilterBitmapTextGM: public FilterBitmapGM {
107  public:
108      FilterBitmapTextGM(float textSize)
109      : fTextSize(textSize)
110        {
111            fName.printf("filterbitmap_text_%.2fpt", fTextSize);
112        }
113
114  protected:
115      float fTextSize;
116
117      SkScalar getScale() SK_OVERRIDE {
118          return 32.f/fTextSize;
119      }
120
121      void makeBitmap() SK_OVERRIDE {
122          fBM.allocN32Pixels(int(fTextSize * 8), int(fTextSize * 6));
123          SkCanvas canvas(fBM);
124          canvas.drawColor(SK_ColorWHITE);
125
126          SkPaint paint;
127          paint.setAntiAlias(true);
128          paint.setSubpixelText(true);
129          paint.setTextSize(fTextSize);
130
131          setTypeface(&paint, "Times", SkTypeface::kNormal);
132          canvas.drawText("Hamburgefons", 12, fTextSize/2, 1.2f*fTextSize, paint);
133          setTypeface(&paint, "Times", SkTypeface::kBold);
134          canvas.drawText("Hamburgefons", 12, fTextSize/2, 2.4f*fTextSize, paint);
135          setTypeface(&paint, "Times", SkTypeface::kItalic);
136          canvas.drawText("Hamburgefons", 12, fTextSize/2, 3.6f*fTextSize, paint);
137          setTypeface(&paint, "Times", SkTypeface::kBoldItalic);
138          canvas.drawText("Hamburgefons", 12, fTextSize/2, 4.8f*fTextSize, paint);
139      }
140  private:
141      typedef FilterBitmapGM INHERITED;
142};
143
144class FilterBitmapCheckerboardGM: public FilterBitmapGM {
145  public:
146      FilterBitmapCheckerboardGM(int size, int num_checks)
147      : fSize(size), fNumChecks(num_checks)
148        {
149            fName.printf("filterbitmap_checkerboard_%d_%d", fSize, fNumChecks);
150        }
151
152  protected:
153      int fSize;
154      int fNumChecks;
155
156      SkScalar getScale() SK_OVERRIDE {
157          return 192.f/fSize;
158      }
159
160      void makeBitmap() SK_OVERRIDE {
161          fBM.allocN32Pixels(fSize, fSize);
162          for (int y = 0; y < fSize; y ++) {
163              for (int x = 0; x < fSize; x ++) {
164                  SkPMColor* s = fBM.getAddr32(x, y);
165                  int cx = (x * fNumChecks) / fSize;
166                  int cy = (y * fNumChecks) / fSize;
167                  if ((cx+cy)%2) {
168                      *s = 0xFFFFFFFF;
169                  } else {
170                      *s = 0xFF000000;
171                  }
172              }
173          }
174      }
175  private:
176      typedef FilterBitmapGM INHERITED;
177};
178
179class FilterBitmapImageGM: public FilterBitmapGM {
180  public:
181      FilterBitmapImageGM(const char filename[])
182      : fFilename(filename)
183        {
184            fName.printf("filterbitmap_image_%s", filename);
185        }
186
187  protected:
188      SkString fFilename;
189      int fSize;
190
191      SkScalar getScale() SK_OVERRIDE {
192          return 192.f/fSize;
193      }
194
195      void makeBitmap() SK_OVERRIDE {
196          SkString path(skiagm::GM::gResourcePath);
197          path.append("/");
198          path.append(fFilename);
199
200          SkImageDecoder *codec = NULL;
201          SkFILEStream stream(path.c_str());
202          if (stream.isValid()) {
203              codec = SkImageDecoder::Factory(&stream);
204          }
205          if (codec) {
206              stream.rewind();
207              codec->decode(&stream, &fBM, kN32_SkColorType, SkImageDecoder::kDecodePixels_Mode);
208              SkDELETE(codec);
209          } else {
210              fBM.allocN32Pixels(1, 1);
211              *(fBM.getAddr32(0,0)) = 0xFF0000FF; // red == bad
212          }
213          fSize = fBM.height();
214      }
215  private:
216      typedef FilterBitmapGM INHERITED;
217};
218
219//////////////////////////////////////////////////////////////////////////////
220
221DEF_GM( return new FilterBitmapTextGM(3); )
222DEF_GM( return new FilterBitmapTextGM(7); )
223DEF_GM( return new FilterBitmapTextGM(10); )
224DEF_GM( return new FilterBitmapCheckerboardGM(4,4); )
225DEF_GM( return new FilterBitmapCheckerboardGM(32,32); )
226DEF_GM( return new FilterBitmapCheckerboardGM(32,8); )
227DEF_GM( return new FilterBitmapCheckerboardGM(32,2); )
228DEF_GM( return new FilterBitmapCheckerboardGM(192,192); )
229DEF_GM( return new FilterBitmapImageGM("mandrill_16.png"); )
230DEF_GM( return new FilterBitmapImageGM("mandrill_32.png"); )
231DEF_GM( return new FilterBitmapImageGM("mandrill_64.png"); )
232DEF_GM( return new FilterBitmapImageGM("mandrill_128.png"); )
233DEF_GM( return new FilterBitmapImageGM("mandrill_256.png"); )
234DEF_GM( return new FilterBitmapImageGM("mandrill_512.png"); )
235