1/*
2 * Copyright 2012 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 "sk_tool_utils.h"
10#include "SkImageSource.h"
11#include "SkMagnifierImageFilter.h"
12#include "SkPixelRef.h"
13#include "SkRandom.h"
14#include "SkSurface.h"
15
16#define WIDTH 500
17#define HEIGHT 500
18
19DEF_SIMPLE_GM_BG(imagemagnifier, canvas, WIDTH, HEIGHT, SK_ColorBLACK) {
20        SkPaint filterPaint;
21        filterPaint.setImageFilter(
22            SkMagnifierImageFilter::Make(
23                SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100),
24                                 SkIntToScalar(WIDTH / 2),
25                                 SkIntToScalar(HEIGHT / 2)),
26                100, nullptr));
27        canvas->saveLayer(nullptr, &filterPaint);
28        const char* str = "The quick brown fox jumped over the lazy dog.";
29        SkRandom rand;
30        for (int i = 0; i < 25; ++i) {
31            int x = rand.nextULessThan(WIDTH);
32            int y = rand.nextULessThan(HEIGHT);
33            SkPaint paint;
34            sk_tool_utils::set_portable_typeface(&paint);
35            paint.setColor(sk_tool_utils::color_to_565(rand.nextBits(24) | 0xFF000000));
36            paint.setTextSize(rand.nextRangeScalar(0, 300));
37            paint.setAntiAlias(true);
38            canvas->drawText(str, strlen(str), SkIntToScalar(x),
39                             SkIntToScalar(y), paint);
40        }
41        canvas->restore();
42}
43
44////////////////////////////////////////////////////////////////////////////////
45#define WIDTH_HEIGHT 256
46
47static sk_sp<SkImage> make_img() {
48    SkBitmap bitmap;
49    bitmap.allocN32Pixels(WIDTH_HEIGHT, WIDTH_HEIGHT);
50    SkCanvas canvas(bitmap);
51
52    canvas.clear(0x0);
53
54    SkPaint paint;
55    paint.setColor(SK_ColorBLUE);
56
57    for (float pos = 0; pos < WIDTH_HEIGHT; pos += 16) {
58        canvas.drawLine(0, pos, SkIntToScalar(WIDTH_HEIGHT), pos, paint);
59        canvas.drawLine(pos, 0, pos, SkIntToScalar(WIDTH_HEIGHT), paint);
60    }
61
62    SkBitmap result;
63    result.setInfo(SkImageInfo::MakeS32(WIDTH_HEIGHT, WIDTH_HEIGHT, kPremul_SkAlphaType));
64    result.setPixelRef(sk_ref_sp(bitmap.pixelRef()), 0, 0);
65
66    return SkImage::MakeFromBitmap(result);
67}
68
69DEF_SIMPLE_GM_BG(imagemagnifier_cropped, canvas, WIDTH_HEIGHT, WIDTH_HEIGHT, SK_ColorBLACK) {
70
71    sk_sp<SkImage> image(make_img());
72
73    sk_sp<SkImageFilter> imageSource(SkImageSource::Make(std::move(image)));
74
75    SkRect srcRect = SkRect::MakeWH(SkIntToScalar(WIDTH_HEIGHT-32),
76                                    SkIntToScalar(WIDTH_HEIGHT-32));
77    srcRect.inset(64.0f, 64.0f);
78
79    constexpr SkScalar kInset = 64.0f;
80
81    // Crop out a 16 pixel ring around the result
82    const SkRect rect = SkRect::MakeXYWH(16, 16, WIDTH_HEIGHT-32, WIDTH_HEIGHT-32);
83    SkImageFilter::CropRect cropRect(rect);
84
85    SkPaint filterPaint;
86    filterPaint.setImageFilter(SkMagnifierImageFilter::Make(srcRect, kInset,
87                                                            std::move(imageSource),
88                                                            &cropRect));
89
90    canvas->saveLayer(nullptr, &filterPaint);
91    canvas->restore();
92}
93