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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         SkPaint paint;
     35         sk_tool_utils::set_portable_typeface(&paint);
     36         paint.setTextSize(20);
     37         paint.setAntiAlias(true);
     38         paint.setLCDRenderText(true);
     39 
     40         SkTextBlobBuilder builder;
     41 
     42         sk_tool_utils::add_to_text_blob(&builder, text, paint, 10, 10);
     43 
     44         sk_sp<SkTextBlob> blob(builder.make());
     45 
     46         SkImageInfo info = SkImageInfo::MakeN32Premul(200, 200);
     47         SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
     48         auto surface = sk_tool_utils::makeSurface(canvas, info, &props);
     49         SkCanvas* c = surface->getCanvas();
     50 
     51         // LCD text on white background
     52         SkRect rect = SkRect::MakeLTRB(0.f, 0.f, SkIntToScalar(kWidth), kHeight / 2.f);
     53         SkPaint rectPaint;
     54         rectPaint.setColor(0xffffffff);
     55         canvas->drawRect(rect, rectPaint);
     56         canvas->drawTextBlob(blob, 10, 50, paint);
     57 
     58         // This should not look garbled since we should disable LCD text in this case
     59         // (i.e., unknown pixel geometry)
     60         c->clear(0x00ffffff);
     61         c->drawTextBlob(blob, 10, 150, paint);
     62         surface->draw(canvas, 0, 0, nullptr);
     63     }
     64 
     65 private:
     66     static constexpr int kWidth = 200;
     67     static constexpr int kHeight = 200;
     68 
     69     typedef GM INHERITED;
     70 };
     71 
     72 //////////////////////////////////////////////////////////////////////////////
     73 
     74 DEF_GM(return new TextBlobGeometryChange;)
     75 }
     76