bigmatrix.cpp revision 081560e3abe25c4821b79ca1465f4dbd371c4b5c 
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
13namespace skiagm {
14
15class BigMatrixGM : public GM {
16public:
17    BigMatrixGM() {
18        this->setBGColor(0xFF66AA99);
19    }
20
21protected:
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.setFilterLevel(SkPaint::kLow_FilterLevel);
84        rect.setLTRB(pt.fX - small, pt.fY - small,
85                     pt.fX + small, pt.fY + small);
86        canvas->drawRect(rect, paint);
87    }
88
89private:
90    typedef GM INHERITED;
91};
92
93//////////////////////////////////////////////////////////////////////////////
94
95static GM* MyFactory(void*) { return new BigMatrixGM; }
96static GMRegistry reg(MyFactory);
97
98}
99