textblobgeometrychange.cpp

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/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BD-style license that can be
 * found in the LICENSE file.
 */
 
#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkSurfaceProps.h"
#include "include/core/SkTextBlob.h"
#include "include/core/SkTypeface.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
 
// This tests that we don't try to reuse textblobs from the GPU textblob cache across pixel geometry
// changes when we have LCD.  crbug/486744
namespace skiagm {
class TextBlobGeometryChange : public GM {
public:
    TextBlobGeometryChange() { }
 
protected:
    SkString getName() const override { return SkString("textblobgeometrychange"); }
 
    SkISize getISize() override { return SkISize::Make(kWidth, kHeight); }
 
    void onDraw(SkCanvas* canvas) override {
        const char text[] = "Hamburgefons";
 
        SkFont font(ToolUtils::DefaultPortableTypeface(), 20);
        font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
 
        SkTextBlobBuilder builder;
 
        ToolUtils::add_to_text_blob(&builder, text, font, 10, 10);
 
        sk_sp<SkTextBlob> blob(builder.make());
 
        SkImageInfo info = SkImageInfo::MakeN32Premul(200, 200);
        SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
        auto           surface = ToolUtils::makeSurface(canvas, info, &props);
        SkCanvas* c = surface->getCanvas();
 
        // LCD text on white background
        SkRect rect = SkRect::MakeLTRB(0.f, 0.f, SkIntToScalar(kWidth), kHeight / 2.f);
        SkPaint rectPaint;
        rectPaint.setColor(0xffffffff);
        canvas->drawRect(rect, rectPaint);
        canvas->drawTextBlob(blob, 10, 50, SkPaint());
 
        // This should not look garbled since we should disable LCD text in this case
        // (i.e., unknown pixel geometry)
        c->clear(0x00ffffff);
        c->drawTextBlob(blob, 10, 150, SkPaint());
        surface->draw(canvas, 0, 0);
    }
 
private:
    inline static constexpr int kWidth = 200;
    inline static constexpr int kHeight = 200;
 
    using INHERITED = GM;
};
 
//////////////////////////////////////////////////////////////////////////////
 
DEF_GM(return new TextBlobGeometryChange;)
}  // namespace skiagm