skbug1719.cpp File Reference

#include "gm/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkScalar.h"

Go to the source code of this file.

Functions
	DEF_SIMPLE_GM_BG (skbug1719, canvas, 300, 100, 0xFF303030)

Function Documentation

DEF_SIMPLE_GM_BG()

DEF_SIMPLE_GM_BG	(	skbug1719	,
		canvas	,
		300	,
		100	,
		0xFF303030
	)

This test exercises bug 1719. An anti-aliased blurred path is rendered through a soft clip. On the GPU a scratch texture was used to hold the original path mask as well as the blurred path result. The same texture is then incorrectly used to generate the soft clip mask for the draw. Thus the same texture is used for both the blur mask and soft mask in a single draw.

The correct image should look like a thin stroked round rect.

Definition at line 26 of file skbug1719.cpp.

                                                          {
        canvas->translate(SkIntToScalar(-800), SkIntToScalar(-650));
 
        // The data is lifted from an SKP that exhibited the bug.
 
        // This is a round rect.
        SkPath clipPath;
        clipPath.moveTo(832.f, 654.f);
        clipPath.lineTo(1034.f, 654.f);
        clipPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
        clipPath.lineTo(1042.f, 724.f);
        clipPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
        clipPath.lineTo(832.f, 732.f);
        clipPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
        clipPath.lineTo(824.f, 662.f);
        clipPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
        clipPath.close();
 
        // This is a round rect nested inside a rect.
        SkPath drawPath;
        drawPath.moveTo(823.f, 653.f);
        drawPath.lineTo(1043.f, 653.f);
        drawPath.lineTo(1043.f, 733.f);
        drawPath.lineTo(823.f, 733.f);
        drawPath.lineTo(823.f, 653.f);
        drawPath.close();
        drawPath.moveTo(832.f, 654.f);
        drawPath.lineTo(1034.f, 654.f);
        drawPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
        drawPath.lineTo(1042.f, 724.f);
        drawPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
        drawPath.lineTo(832.f, 732.f);
        drawPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
        drawPath.lineTo(824.f, 662.f);
        drawPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
        drawPath.close();
        drawPath.setFillType(SkPathFillType::kEvenOdd);
 
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setColor(0xFF000000);
        paint.setMaskFilter(
            SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 0.78867501f));
        paint.setColorFilter(SkColorFilters::Blend(0xBFFFFFFF, SkBlendMode::kSrcIn));
 
        canvas->clipPath(clipPath, true);
        canvas->drawPath(drawPath, paint);
}