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