xref: /aosp_15_r20/external/skia/gm/clip_error.cpp (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17)
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 #include "tools/fonts/FontToolUtils.h"
25 
26 #include <string.h>
27 
28 #define WIDTH 800
29 #define HEIGHT 800
30 
draw_text(SkCanvas * canvas,sk_sp<SkTextBlob> blob,const SkPaint & paint,const SkPaint & blurPaint,const SkPaint & clearPaint)31 static void draw_text(SkCanvas* canvas, sk_sp<SkTextBlob> blob,
32                       const SkPaint& paint, const SkPaint& blurPaint,
33                       const SkPaint& clearPaint) {
34     canvas->save();
35     canvas->clipRect(SkRect::MakeLTRB(0, 0, 1081, 665));
36     canvas->drawRect(SkRect::MakeLTRB(0, 0, 1081, 665), clearPaint);
37     // draw as blurred to push glyph to be too large for atlas
38     canvas->drawTextBlob(blob, 0, 256, blurPaint);
39     canvas->drawTextBlob(blob, 0, 477, paint);
40     canvas->restore();
41 }
42 
43 // This test ensures that glyphs that are too large for the atlas
44 // are both translated and clipped correctly.
45 class ClipErrorGM : public skiagm::GM {
46 public:
ClipErrorGM()47     ClipErrorGM() {}
48 
49 protected:
getName() const50     SkString getName() const override { return SkString("cliperror"); }
51 
getISize()52     SkISize getISize() override { return SkISize::Make(WIDTH, HEIGHT); }
53 
onDraw(SkCanvas * canvas)54     void onDraw(SkCanvas* canvas) override {
55         SkPaint paint;
56         paint.setAntiAlias(true);
57 
58         SkFont font(ToolUtils::DefaultPortableTypeface(), 256);
59 
60         // setup up maskfilter
61         const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(50));
62 
63         SkPaint blurPaint(paint);
64         blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, kSigma));
65 
66         const char text[] = "hambur";
67         auto blob = SkTextBlob::MakeFromText(text, strlen(text), font);
68 
69         SkPaint clearPaint(paint);
70         clearPaint.setColor(SK_ColorWHITE);
71 
72         canvas->save();
73         canvas->translate(0, 0);
74         canvas->clipRect(SkRect::MakeLTRB(0, 0, WIDTH, 256));
75         draw_text(canvas, blob, paint, blurPaint, clearPaint);
76         canvas->restore();
77 
78         canvas->save();
79         canvas->translate(0, 256);
80         canvas->clipRect(SkRect::MakeLTRB(0, 256, WIDTH, 510));
81         draw_text(canvas, blob, paint, blurPaint, clearPaint);
82         canvas->restore();
83     }
84 
85 private:
86     using INHERITED = skiagm::GM;
87 };
88 
89 DEF_GM(return new ClipErrorGM;)
90