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      1 /*
      2  * Copyright 2015 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 
      9 /*
     10  * Tests overlapping LCD text
     11  */
     12 
     13 #include "gm.h"
     14 #include "SkCanvas.h"
     15 #include "SkSurface.h"
     16 #include "SkTextBlob.h"
     17 
     18 namespace skiagm {
     19 
     20 static const int kWidth = 750;
     21 static const int kHeight = 750;
     22 
     23 class LcdOverlapGM : public skiagm::GM {
     24 public:
     25     LcdOverlapGM() {
     26         const int kPointSize = 25;
     27         fTextHeight = SkIntToScalar(kPointSize);
     28     }
     29 
     30 protected:
     31     SkString onShortName() override {
     32         return SkString("lcdoverlap");
     33     }
     34 
     35     void onOnceBeforeDraw() override {
     36         // build text blob
     37         SkTextBlobBuilder builder;
     38 
     39         SkPaint paint;
     40         sk_tool_utils::set_portable_typeface(&paint);
     41         paint.setTextSize(32);
     42         const char* text = "able was I ere I saw elba";
     43         paint.setAntiAlias(true);
     44         paint.setSubpixelText(true);
     45         paint.setLCDRenderText(true);
     46         sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, 0);
     47         fBlob.reset(builder.build());
     48     }
     49 
     50     SkISize onISize() override { return SkISize::Make(kWidth, kHeight); }
     51 
     52     void drawTestCase(SkCanvas* canvas, SkScalar x, SkScalar y, SkXfermode::Mode mode,
     53                       SkXfermode::Mode mode2) {
     54         const SkColor colors[] {
     55                 SK_ColorRED,
     56                 SK_ColorGREEN,
     57                 SK_ColorBLUE,
     58                 SK_ColorYELLOW,
     59                 SK_ColorCYAN,
     60                 SK_ColorMAGENTA,
     61         };
     62 
     63         SkAutoTUnref<SkXfermode> xfermode(SkXfermode::Create(mode));
     64         SkAutoTUnref<SkXfermode> xfermode2(SkXfermode::Create(mode2));
     65         for (size_t i = 0; i < SK_ARRAY_COUNT(colors); i++) {
     66             canvas->save();
     67             canvas->translate(x, y);
     68             canvas->rotate(360.0f / SK_ARRAY_COUNT(colors) * i);
     69             canvas->translate(-fBlob->bounds().width() / 2.0f + 0.5f, 0);
     70 
     71             SkPaint textPaint;
     72             textPaint.setColor(colors[i]);
     73             textPaint.setXfermode(i % 2 == 0 ? xfermode : xfermode2);
     74             canvas->drawTextBlob(fBlob, 0, 0, textPaint);
     75             canvas->restore();
     76         }
     77     }
     78 
     79     void onDraw(SkCanvas* canvas) override {
     80         SkScalar offsetX = kWidth / 4.0f;
     81         SkScalar offsetY = kHeight / 4.0f;
     82         drawTestCase(canvas, offsetX, offsetY,  SkXfermode::kSrc_Mode, SkXfermode::kSrc_Mode);
     83         drawTestCase(canvas, 3 * offsetX, offsetY,  SkXfermode::kSrcOver_Mode,
     84                      SkXfermode::kSrcOver_Mode);
     85         drawTestCase(canvas, offsetX, 3 * offsetY,  SkXfermode::kHardLight_Mode,
     86                      SkXfermode::kLuminosity_Mode);
     87         drawTestCase(canvas, 3 * offsetX, 3 * offsetY,  SkXfermode::kSrcOver_Mode,
     88                      SkXfermode::kSrc_Mode);
     89     }
     90 
     91 private:
     92     SkScalar fTextHeight;
     93     SkAutoTUnref<const SkTextBlob> fBlob;
     94     typedef skiagm::GM INHERITED;
     95 };
     96 
     97 //////////////////////////////////////////////////////////////////////////////
     98 
     99 DEF_GM( return new LcdOverlapGM; )
    100 }
    101