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