xref: /third_party/skia/gm/clip_error.cpp (revision cb93a386) 
1/*
2 * Copyright 2016 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/gm.h"
9#include "include/core/SkBlurTypes.h"
10#include "include/core/SkCanvas.h"
11#include "include/core/SkColor.h"
12#include "include/core/SkFont.h"
13#include "include/core/SkMaskFilter.h"
14#include "include/core/SkPaint.h"
15#include "include/core/SkRect.h"
16#include "include/core/SkRefCnt.h"
17#include "include/core/SkScalar.h"
18#include "include/core/SkSize.h"
19#include "include/core/SkString.h"
20#include "include/core/SkTextBlob.h"
21#include "include/core/SkTypeface.h"
22#include "src/core/SkBlurMask.h"
23#include "tools/ToolUtils.h"
24
25#include <string.h>
26
27#define WIDTH 800
28#define HEIGHT 800
29
30static void draw_text(SkCanvas* canvas, sk_sp<SkTextBlob> blob,
31                      const SkPaint& paint, const SkPaint& blurPaint,
32                      const SkPaint& clearPaint) {
33    canvas->save();
34    canvas->clipRect(SkRect::MakeLTRB(0, 0, 1081, 665));
35    canvas->drawRect(SkRect::MakeLTRB(0, 0, 1081, 665), clearPaint);
36    // draw as blurred to push glyph to be too large for atlas
37    canvas->drawTextBlob(blob, 0, 256, blurPaint);
38    canvas->drawTextBlob(blob, 0, 477, paint);
39    canvas->restore();
40}
41
42// This test ensures that glyphs that are too large for the atlas
43// are both translated and clipped correctly.
44class ClipErrorGM : public skiagm::GM {
45public:
46    ClipErrorGM() {}
47
48protected:
49    SkString onShortName() override { return SkString("cliperror"); }
50
51    SkISize onISize() override { return SkISize::Make(WIDTH, HEIGHT); }
52
53    void onDraw(SkCanvas* canvas) override {
54        SkPaint paint;
55        paint.setAntiAlias(true);
56
57        SkFont font(ToolUtils::create_portable_typeface(), 256);
58
59        // setup up maskfilter
60        const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(50));
61
62        SkPaint blurPaint(paint);
63        blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, kSigma));
64
65        const char text[] = "hambur";
66        auto blob = SkTextBlob::MakeFromText(text, strlen(text), font);
67
68        SkPaint clearPaint(paint);
69        clearPaint.setColor(SK_ColorWHITE);
70
71        canvas->save();
72        canvas->translate(0, 0);
73        canvas->clipRect(SkRect::MakeLTRB(0, 0, WIDTH, 256));
74        draw_text(canvas, blob, paint, blurPaint, clearPaint);
75        canvas->restore();
76
77        canvas->save();
78        canvas->translate(0, 256);
79        canvas->clipRect(SkRect::MakeLTRB(0, 256, WIDTH, 510));
80        draw_text(canvas, blob, paint, blurPaint, clearPaint);
81        canvas->restore();
82    }
83
84private:
85    using INHERITED = skiagm::GM;
86};
87
88DEF_GM(return new ClipErrorGM;)
89