submodule/skia/gm/textblobgeometrychange.cpp

   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/gm.h"
   9 #include "include/core/SkCanvas.h"
  10 #include "include/core/SkFont.h"
  11 #include "include/core/SkImageInfo.h"
  12 #include "include/core/SkPaint.h"
  13 #include "include/core/SkRect.h"
  14 #include "include/core/SkRefCnt.h"
  15 #include "include/core/SkScalar.h"
  16 #include "include/core/SkSize.h"
  17 #include "include/core/SkString.h"
  18 #include "include/core/SkSurface.h"
  19 #include "include/core/SkSurfaceProps.h"
  20 #include "include/core/SkTextBlob.h"
  21 #include "include/core/SkTypeface.h"
  22 #include "tools/ToolUtils.h"
  23
  24 // This tests that we don't try to reuse textblobs from the GPU textblob cache across pixel geometry
  25 // changes when we have LCD.  crbug/486744
  26 namespace skiagm {
  27 class TextBlobGeometryChange : public GM {
  28 public:
  29     TextBlobGeometryChange() { }
  30
  31 protected:
  32     SkString onShortName() override {
  33         return SkString("textblobgeometrychange");
  34     }
  35
  36     SkISize onISize() override {
  37         return SkISize::Make(kWidth, kHeight);
  38     }
  39
  40     void onDraw(SkCanvas* canvas) override {
  41         const char text[] = "Hamburgefons";
  42
  43         SkFont font(ToolUtils::create_portable_typeface(), 20);
  44         font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
  45
  46         SkTextBlobBuilder builder;
  47
  48         ToolUtils::add_to_text_blob(&builder, text, font, 10, 10);
  49
  50         sk_sp<SkTextBlob> blob(builder.make());
  51
  52         SkImageInfo info = SkImageInfo::MakeN32Premul(200, 200);
  53         SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
  54         auto           surface = ToolUtils::makeSurface(canvas, info, &props);
  55         SkCanvas* c = surface->getCanvas();
  56
  57         // LCD text on white background
  58         SkRect rect = SkRect::MakeLTRB(0.f, 0.f, SkIntToScalar(kWidth), kHeight / 2.f);
  59         SkPaint rectPaint;
  60         rectPaint.setColor(0xffffffff);
  61         canvas->drawRect(rect, rectPaint);
  62         canvas->drawTextBlob(blob, 10, 50, SkPaint());
  63
  64         // This should not look garbled since we should disable LCD text in this case
  65         // (i.e., unknown pixel geometry)
  66         c->clear(0x00ffffff);
  67         c->drawTextBlob(blob, 10, 150, SkPaint());
  68         surface->draw(canvas, 0, 0);
  69     }
  70
  71 private:
  72     inline static constexpr int kWidth = 200;
  73     inline static constexpr int kHeight = 200;
  74
  75     using INHERITED = GM;
  76 };
  77
  78 //////////////////////////////////////////////////////////////////////////////
  79
  80 DEF_GM(return new TextBlobGeometryChange;)
  81 }  // namespace skiagm