src/core/SkMaskFilter.cpp

/* libs/graphics/sgl/SkMaskFilter.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
*/

#include "SkMaskFilter.h"
#include "SkBlitter.h"
#include "SkBounder.h"
#include "SkBuffer.h"
#include "SkDraw.h"
#include "SkRegion.h"

bool SkMaskFilter::filterMask(SkMask*, const SkMask&, const SkMatrix&, SkIPoint*)
{
    return false;
}

bool SkMaskFilter::filterPath(const SkPath& devPath, const SkMatrix& matrix,
                              const SkRegion& clip, SkBounder* bounder,
                              SkBlitter* blitter)
{
    SkMask  srcM, dstM;

    if (!SkDraw::DrawToMask(devPath, &clip.getBounds(), this, &matrix, &srcM,
                            SkMask::kComputeBoundsAndRenderImage_CreateMode))
    {
        return false;
    }

    SkAutoMaskImage autoSrc(&srcM, false);

    if (!this->filterMask(&dstM, srcM, matrix, NULL))
        return false;

    SkAutoMaskImage         autoDst(&dstM, false);
    SkRegion::Cliperator    clipper(clip, dstM.fBounds);

    if (!clipper.done() && (bounder == NULL || bounder->doIRect(dstM.fBounds)))
    {
        const SkIRect& cr = clipper.rect();
        do {
            blitter->blitMask(dstM, cr);
            clipper.next();
        } while (!clipper.done());
    }

    return true;
}