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      1 
      2 /*
      3  * Copyright 2012 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "gm.h"
      9 
     10 #include "SkColorPriv.h"
     11 #include "SkShader.h"
     12 
     13 namespace skiagm {
     14 
     15 class BigMatrixGM : public GM {
     16 public:
     17     BigMatrixGM() {
     18         this->setBGColor(0xFF66AA99);
     19     }
     20 
     21 protected:
     22     virtual SkString onShortName() {
     23         return SkString("bigmatrix");
     24     }
     25 
     26     virtual SkISize onISize() {
     27         return make_isize(50, 50);
     28     }
     29 
     30     virtual void onDraw(SkCanvas* canvas) {
     31         SkMatrix m;
     32         m.reset();
     33         m.setRotate(33 * SK_Scalar1);
     34         m.postScale(3000 * SK_Scalar1, 3000 * SK_Scalar1);
     35         m.postTranslate(6000 * SK_Scalar1, -5000 * SK_Scalar1);
     36         canvas->concat(m);
     37 
     38         SkPaint paint;
     39         paint.setColor(SK_ColorRED);
     40         paint.setAntiAlias(true);
     41 
     42         bool success = m.invert(&m);
     43         SkASSERT(success);
     44         (void) success; // silence compiler :(
     45 
     46         SkPath path;
     47 
     48         SkPoint pt = {10 * SK_Scalar1, 10 * SK_Scalar1};
     49         SkScalar small = 1 / (500 * SK_Scalar1);
     50 
     51         m.mapPoints(&pt, 1);
     52         path.addCircle(pt.fX, pt.fY, small);
     53         canvas->drawPath(path, paint);
     54 
     55         pt.set(30 * SK_Scalar1, 10 * SK_Scalar1);
     56         m.mapPoints(&pt, 1);
     57         SkRect rect = {pt.fX - small, pt.fY - small,
     58                        pt.fX + small, pt.fY + small};
     59         canvas->drawRect(rect, paint);
     60 
     61         SkBitmap bmp;
     62         bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
     63         bmp.allocPixels();
     64         bmp.lockPixels();
     65         uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
     66         pixels[0] = SkPackARGB32(0xFF, 0xFF, 0x00, 0x00);
     67         pixels[1] = SkPackARGB32(0xFF, 0x00, 0xFF, 0x00);
     68         pixels[2] = SkPackARGB32(0x80, 0x00, 0x00, 0x00);
     69         pixels[3] = SkPackARGB32(0xFF, 0x00, 0x00, 0xFF);
     70         bmp.unlockPixels();
     71         pt.set(30 * SK_Scalar1, 30 * SK_Scalar1);
     72         m.mapPoints(&pt, 1);
     73         SkShader* shader = SkShader::CreateBitmapShader(
     74                                             bmp,
     75                                             SkShader::kRepeat_TileMode,
     76                                             SkShader::kRepeat_TileMode);
     77         SkMatrix s;
     78         s.reset();
     79         s.setScale(SK_Scalar1 / 1000, SK_Scalar1 / 1000);
     80         shader->setLocalMatrix(s);
     81         paint.setShader(shader)->unref();
     82         paint.setAntiAlias(false);
     83         paint.setFilterBitmap(true);
     84         rect.setLTRB(pt.fX - small, pt.fY - small,
     85                      pt.fX + small, pt.fY + small);
     86         canvas->drawRect(rect, paint);
     87     }
     88 
     89 private:
     90     typedef GM INHERITED;
     91 };
     92 
     93 //////////////////////////////////////////////////////////////////////////////
     94 
     95 static GM* MyFactory(void*) { return new BigMatrixGM; }
     96 static GMRegistry reg(MyFactory);
     97 
     98 }
     99