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      1 /*
      2  * Copyright 2015 Google Inc.
      3  *
      4  * Use of this source code is governed by a BD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "sk_tool_utils.h"
     10 
     11 #include "SkCanvas.h"
     12 #include "SkSurface.h"
     13 #include "SkTextBlob.h"
     14 
     15 // This tests that we don't try to reuse textblobs from the GPU textblob cache across pixel geometry
     16 // changes when we have LCD.  crbug/486744
     17 namespace skiagm {
     18 class TextBlobGeometryChange : public GM {
     19 public:
     20     TextBlobGeometryChange() { }
     21 
     22 protected:
     23     SkString onShortName() override {
     24         return SkString("textblobgeometrychange");
     25     }
     26 
     27     SkISize onISize() override {
     28         return SkISize::Make(kWidth, kHeight);
     29     }
     30 
     31     void onDraw(SkCanvas* canvas) override {
     32         const char text[] = "Hamburgefons";
     33 
     34         SkFont font(sk_tool_utils::create_portable_typeface(), 20);
     35         font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
     36 
     37         SkTextBlobBuilder builder;
     38 
     39         sk_tool_utils::add_to_text_blob(&builder, text, font, 10, 10);
     40 
     41         sk_sp<SkTextBlob> blob(builder.make());
     42 
     43         SkImageInfo info = SkImageInfo::MakeN32Premul(200, 200);
     44         SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
     45         auto surface = sk_tool_utils::makeSurface(canvas, info, &props);
     46         SkCanvas* c = surface->getCanvas();
     47 
     48         // LCD text on white background
     49         SkRect rect = SkRect::MakeLTRB(0.f, 0.f, SkIntToScalar(kWidth), kHeight / 2.f);
     50         SkPaint rectPaint;
     51         rectPaint.setColor(0xffffffff);
     52         canvas->drawRect(rect, rectPaint);
     53         canvas->drawTextBlob(blob, 10, 50, SkPaint());
     54 
     55         // This should not look garbled since we should disable LCD text in this case
     56         // (i.e., unknown pixel geometry)
     57         c->clear(0x00ffffff);
     58         c->drawTextBlob(blob, 10, 150, SkPaint());
     59         surface->draw(canvas, 0, 0, nullptr);
     60     }
     61 
     62 private:
     63     static constexpr int kWidth = 200;
     64     static constexpr int kHeight = 200;
     65 
     66     typedef GM INHERITED;
     67 };
     68 
     69 //////////////////////////////////////////////////////////////////////////////
     70 
     71 DEF_GM(return new TextBlobGeometryChange;)
     72 }
     73