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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkPictureImageFilter.h"
      9 #include "SkDevice.h"
     10 #include "SkCanvas.h"
     11 #include "SkFlattenableBuffers.h"
     12 #include "SkValidationUtils.h"
     13 
     14 SkPictureImageFilter::SkPictureImageFilter(SkPicture* picture)
     15   : INHERITED(0, 0),
     16     fPicture(picture),
     17     fRect(SkRect::MakeWH(picture ? SkIntToScalar(picture->width()) : 0,
     18                          picture ? SkIntToScalar(picture->height()) : 0)) {
     19     SkSafeRef(fPicture);
     20 }
     21 
     22 SkPictureImageFilter::SkPictureImageFilter(SkPicture* picture, const SkRect& rect)
     23   : INHERITED(0, 0),
     24     fPicture(picture),
     25     fRect(rect) {
     26     SkSafeRef(fPicture);
     27 }
     28 
     29 SkPictureImageFilter::~SkPictureImageFilter() {
     30     SkSafeUnref(fPicture);
     31 }
     32 
     33 SkPictureImageFilter::SkPictureImageFilter(SkFlattenableReadBuffer& buffer)
     34   : INHERITED(0, buffer),
     35     fPicture(NULL) {
     36     // FIXME: unflatten picture here.
     37     buffer.readRect(&fRect);
     38 }
     39 
     40 void SkPictureImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
     41     this->INHERITED::flatten(buffer);
     42     // FIXME: flatten picture here.
     43     buffer.writeRect(fRect);
     44 }
     45 
     46 bool SkPictureImageFilter::onFilterImage(Proxy* proxy, const SkBitmap&, const SkMatrix& matrix,
     47                                    SkBitmap* result, SkIPoint* offset) {
     48     if (!fPicture) {
     49         return true;
     50     }
     51 
     52     SkRect floatBounds;
     53     SkIRect bounds;
     54     matrix.mapRect(&floatBounds, fRect);
     55     floatBounds.roundOut(&bounds);
     56 
     57     if (bounds.isEmpty()) {
     58         return true;
     59     }
     60 
     61     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
     62     if (NULL == device.get()) {
     63         return false;
     64     }
     65 
     66     SkCanvas canvas(device.get());
     67     SkPaint paint;
     68 
     69     canvas.translate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
     70     canvas.concat(matrix);
     71     canvas.drawPicture(*fPicture);
     72 
     73     *result = device.get()->accessBitmap(false);
     74     offset->fX += bounds.fLeft;
     75     offset->fY += bounds.fTop;
     76     return true;
     77 }
     78