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:
TextBlobGeometryChange()20     TextBlobGeometryChange() { }
21 
22 protected:
onShortName()23     SkString onShortName() override {
24         return SkString("textblobgeometrychange");
25     }
26 
onISize()27     SkISize onISize() override {
28         return SkISize::Make(kWidth, kHeight);
29     }
30 
onDraw(SkCanvas * canvas)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