gm/clip_error.cpp

   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;)