clip_error.cpp

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/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#include "gm/gm.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkMaskFilter.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/SkTextBlob.h"
#include "include/core/SkTypeface.h"
#include "src/core/SkBlurMask.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
 
#include <string.h>
 
#define WIDTH 800
#define HEIGHT 800
 
static void draw_text(SkCanvas* canvas, sk_sp<SkTextBlob> blob,
                      const SkPaint& paint, const SkPaint& blurPaint,
                      const SkPaint& clearPaint) {
    canvas->save();
    canvas->clipRect(SkRect::MakeLTRB(0, 0, 1081, 665));
    canvas->drawRect(SkRect::MakeLTRB(0, 0, 1081, 665), clearPaint);
    // draw as blurred to push glyph to be too large for atlas
    canvas->drawTextBlob(blob, 0, 256, blurPaint);
    canvas->drawTextBlob(blob, 0, 477, paint);
    canvas->restore();
}
 
// This test ensures that glyphs that are too large for the atlas
// are both translated and clipped correctly.
class ClipErrorGM : public skiagm::GM {
public:
    ClipErrorGM() {}
 
protected:
    SkString getName() const override { return SkString("cliperror"); }
 
    SkISize getISize() override { return SkISize::Make(WIDTH, HEIGHT); }
 
    void onDraw(SkCanvas* canvas) override {
        SkPaint paint;
        paint.setAntiAlias(true);
 
        SkFont font(ToolUtils::DefaultPortableTypeface(), 256);
 
        // setup up maskfilter
        const SkScalar kSigma = SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(50));
 
        SkPaint blurPaint(paint);
        blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, kSigma));
 
        const char text[] = "hambur";
        auto blob = SkTextBlob::MakeFromText(text, strlen(text), font);
 
        SkPaint clearPaint(paint);
        clearPaint.setColor(SK_ColorWHITE);
 
        canvas->save();
        canvas->translate(0, 0);
        canvas->clipRect(SkRect::MakeLTRB(0, 0, WIDTH, 256));
        draw_text(canvas, blob, paint, blurPaint, clearPaint);
        canvas->restore();
 
        canvas->save();
        canvas->translate(0, 256);
        canvas->clipRect(SkRect::MakeLTRB(0, 256, WIDTH, 510));
        draw_text(canvas, blob, paint, blurPaint, clearPaint);
        canvas->restore();
    }
 
private:
    using INHERITED = skiagm::GM;
};
 
DEF_GM(return new ClipErrorGM;)