textblobgeometrychange.cpp revision 944876f2745a62a839e49275daf93a0329372e67 
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
10#include "SkCanvas.h"
11#include "SkSurface.h"
12#include "SkTextBlob.h"
13
14// This tests that we don't try to reuse textblobs from the GPU textblob cache across pixel geometry
15// changes when we have LCD.  crbug/486744
16namespace skiagm {
17class TextBlobGeometryChange : public GM {
18public:
19    TextBlobGeometryChange() { }
20
21protected:
22    SkString onShortName() override {
23        return SkString("textblobgeometrychange");
24    }
25
26    SkISize onISize() override {
27        return SkISize::Make(kWidth, kHeight);
28    }
29
30    void onDraw(SkCanvas* canvas) override {
31        const char text[] = "Hamburgefons";
32
33        SkPaint paint;
34        sk_tool_utils::set_portable_typeface(&paint);
35        paint.setTextSize(20);
36        paint.setAntiAlias(true);
37        paint.setLCDRenderText(true);
38
39        SkTextBlobBuilder builder;
40
41        sk_tool_utils::add_to_text_blob(&builder, text, paint, 10, 10);
42
43        SkAutoTUnref<const SkTextBlob> blob(builder.build());
44
45        SkImageInfo info = SkImageInfo::MakeN32(200, 200, kPremul_SkAlphaType,
46                                                sk_ref_sp(canvas->imageInfo().colorSpace()));
47        SkSurfaceProps canvasProps(SkSurfaceProps::kLegacyFontHost_InitType);
48        uint32_t gammaCorrect = canvas->getProps(&canvasProps)
49            ? canvasProps.flags() & SkSurfaceProps::kGammaCorrect_Flag : 0;
50        SkSurfaceProps props(gammaCorrect, kUnknown_SkPixelGeometry);
51        auto surface = canvas->makeSurface(info, &props);
52        if (!surface) {
53            surface = SkSurface::MakeRaster(info, &props);
54        }
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.get(), 10, 50, paint);
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.get(), 10, 150, paint);
68        surface->draw(canvas, 0, 0, nullptr);
69    }
70
71private:
72    static const int kWidth = 200;
73    static const int kHeight = 200;
74
75    typedef GM INHERITED;
76};
77
78//////////////////////////////////////////////////////////////////////////////
79
80DEF_GM(return new TextBlobGeometryChange;)
81}
82