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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrRectBatchFactory.h"
#include "GrAAStrokeRectBatch.h"
#include "SkStrokeRec.h"
namespace GrRectBatchFactory {
GrDrawBatch* CreateAAStroke(GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkRect& devRect,
const SkStrokeRec& stroke) {
SkVector devStrokeSize;
SkScalar width = stroke.getWidth();
if (width > 0) {
devStrokeSize.set(width, width);
viewMatrix.mapVectors(&devStrokeSize, 1);
devStrokeSize.setAbs(devStrokeSize);
} else {
devStrokeSize.set(SK_Scalar1, SK_Scalar1);
}
const SkScalar dx = devStrokeSize.fX;
const SkScalar dy = devStrokeSize.fY;
const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);
SkRect devOutside(devRect);
devOutside.outset(rx, ry);
bool miterStroke = true;
// For hairlines, make bevel and round joins appear the same as mitered ones.
// small miter limit means right angles show bevel...
if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
stroke.getMiter() < SK_ScalarSqrt2)) {
miterStroke = false;
}
SkRect devInside(devRect);
devInside.inset(rx, ry);
// If we have a degenerate stroking rect(ie the stroke is larger than inner rect) then we
// make a degenerate inside rect to avoid double hitting. We will also jam all of the points
// together when we render these rects.
SkScalar spare;
{
SkScalar w = devRect.width() - dx;
SkScalar h = devRect.height() - dy;
spare = SkTMin(w, h);
}
bool degenerate = spare <= 0;
if (degenerate) {
devInside.fLeft = devInside.fRight = devRect.centerX();
devInside.fTop = devInside.fBottom = devRect.centerY();
}
SkRect devOutsideAssist(devRect);
// For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
// to draw the outer of the rect. Because there are 8 vertices on the outer
// edge, while vertex number of inner edge is 4, the same as miter-stroke.
if (!miterStroke) {
devOutside.inset(0, ry);
devOutsideAssist.outset(0, ry);
}
return GrAAStrokeRectBatch::Create(color, viewMatrix, devOutside, devOutsideAssist, devInside,
miterStroke, degenerate);
}
GrDrawBatch* CreateAAFillNestedRects(GrColor color,
const SkMatrix& viewMatrix,
const SkRect rects[2]) {
SkASSERT(viewMatrix.rectStaysRect());
SkASSERT(!rects[0].isEmpty() && !rects[1].isEmpty());
SkRect devOutside, devInside;
viewMatrix.mapRect(&devOutside, rects[0]);
viewMatrix.mapRect(&devInside, rects[1]);
return GrAAStrokeRectBatch::Create(color, viewMatrix, devOutside, devOutside, devInside, true,
devInside.isEmpty());
}
};
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