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#include "SkBitmap.h"
10#include "SkCanvas.h"
11#include "SkColor.h"
12#include "SkShader.h"
13
14namespace skiagm {
15
16// This GM draws a 3x3 grid (with the center element excluded) of rectangles
17// filled with a bitmap shader. The bitmap shader is transformed so that the
18// pattern cell is at the center (excluded) region.
19//
20// In Repeat and Mirror mode, this tests that the bitmap shader still draws
21// even though the pattern cell is outside the clip.
22//
23// In Clamp mode, this tests that the clamp is handled properly. For PDF,
24// (and possibly other exported formats) this also "tests" that the image itself
25// is not stored (well, you'll need to open it up with an external tool to
26// verify that).
27
28static SkBitmap create_bitmap() {
29    SkBitmap bmp;
30    bmp.allocN32Pixels(2, 2);
31    uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
32    pixels[0] = SkPreMultiplyColor(SK_ColorRED);
33    pixels[1] = SkPreMultiplyColor(SK_ColorGREEN);
34    pixels[2] = SkPreMultiplyColor(SK_ColorBLACK);
35    pixels[3] = SkPreMultiplyColor(SK_ColorBLUE);
36
37    return bmp;
38}
39
40static const SkScalar RECT_SIZE = 64;
41static const SkScalar SLIDE_SIZE = 300;
42
43class ClippedBitmapShadersGM : public GM {
44public:
45    ClippedBitmapShadersGM(SkShader::TileMode mode, bool hq=false)
46    : fMode(mode), fHQ(hq) {
47    }
48
49protected:
50    SkShader::TileMode fMode;
51    bool fHQ;
52
53    virtual SkString onShortName() {
54        SkString descriptor;
55        switch (fMode) {
56            case SkShader::kRepeat_TileMode:
57                descriptor = "tile";
58            break;
59            case SkShader::kMirror_TileMode:
60                descriptor = "mirror";
61            break;
62            case SkShader::kClamp_TileMode:
63                descriptor = "clamp";
64            break;
65            default:
66                SkASSERT(false);
67        }
68        descriptor.prepend("clipped-bitmap-shaders-");
69        if (fHQ) {
70            descriptor.append("-hq");
71        }
72        return descriptor;
73    }
74
75    virtual SkISize onISize() {
76        return SkISize::Make(300, 300);
77    }
78
79    virtual void onDraw(SkCanvas* canvas) {
80        SkBitmap bmp = create_bitmap();
81        SkMatrix s;
82        s.reset();
83        s.setScale(8, 8);
84        s.postTranslate(SLIDE_SIZE / 2, SLIDE_SIZE / 2);
85        SkShader* shader = SkShader::CreateBitmapShader(
86                bmp, fMode, fMode, &s);
87
88        SkPaint paint;
89        paint.setShader(shader)->unref();
90
91        if (fHQ) {
92            paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
93        }
94
95        SkScalar margin = (SLIDE_SIZE / 3 - RECT_SIZE) / 2;
96        for (int i = 0; i < 3; i++) {
97            SkScalar yOrigin = SLIDE_SIZE / 3 * i + margin;
98            for (int j = 0; j < 3; j++) {
99                SkScalar xOrigin = SLIDE_SIZE / 3 * j + margin;
100                if (i == 1 && j == 1) {
101                    continue;   // skip center element
102                }
103                SkRect rect = SkRect::MakeXYWH(xOrigin, yOrigin,
104                                               RECT_SIZE, RECT_SIZE);
105                canvas->save();
106                canvas->clipRect(rect);
107                canvas->drawRect(rect, paint);
108                canvas->restore();
109            }
110        }
111    }
112
113private:
114    typedef GM INHERITED;
115};
116
117//////////////////////////////////////////////////////////////////////////////
118
119DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode); )
120DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode); )
121DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode); )
122
123DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode, true); )
124DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode, true); )
125DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode, true); )
126
127
128}
129