Home | History | Annotate | Download | only in effects 
      1 /*
      2  * Copyright 2013 Google Inc.
      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 "SkTileImageFilter.h"
      9 #include "SkBitmap.h"
     10 #include "SkCanvas.h"
     11 #include "SkDevice.h"
     12 #include "SkReadBuffer.h"
     13 #include "SkWriteBuffer.h"
     14 #include "SkMatrix.h"
     15 #include "SkPaint.h"
     16 #include "SkShader.h"
     17 #include "SkValidationUtils.h"
     18 
     19 SkTileImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect,
     20                                              SkImageFilter* input, uint32_t uniqueID) {
     21     if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
     22         return NULL;
     23     }
     24     return SkNEW_ARGS(SkTileImageFilter, (srcRect, dstRect, input, uniqueID));
     25 }
     26 
     27 bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
     28                                       const Context& ctx,
     29                                       SkBitmap* dst, SkIPoint* offset) const {
     30     SkBitmap source = src;
     31     SkImageFilter* input = getInput(0);
     32     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     33     if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
     34         return false;
     35     }
     36 
     37     SkRect dstRect;
     38     ctx.ctm().mapRect(&dstRect, fDstRect);
     39     SkIRect dstIRect;
     40     dstRect.roundOut(&dstIRect);
     41     int w = dstIRect.width();
     42     int h = dstIRect.height();
     43     if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
     44         return false;
     45     }
     46 
     47     SkRect srcRect;
     48     ctx.ctm().mapRect(&srcRect, fSrcRect);
     49     SkIRect srcIRect;
     50     srcRect.roundOut(&srcIRect);
     51     srcIRect.offset(-srcOffset);
     52     SkBitmap subset;
     53     SkIRect bounds;
     54     source.getBounds(&bounds);
     55 
     56     if (!srcIRect.intersect(bounds)) {
     57         offset->fX = offset->fY = 0;
     58         return true;
     59     } else if (!source.extractSubset(&subset, srcIRect)) {
     60         return false;
     61     }
     62 
     63     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
     64     if (NULL == device.get()) {
     65         return false;
     66     }
     67     SkCanvas canvas(device);
     68     SkPaint paint;
     69     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     70 
     71     SkMatrix shaderMatrix;
     72     shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX),
     73                               SkIntToScalar(srcOffset.fY));
     74     SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset,
     75                                   SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
     76                                   &shaderMatrix));
     77     paint.setShader(shader);
     78     canvas.translate(-dstRect.fLeft, -dstRect.fTop);
     79     canvas.drawRect(dstRect, paint);
     80     *dst = device->accessBitmap(false);
     81     offset->fX = dstIRect.fLeft;
     82     offset->fY = dstIRect.fTop;
     83     return true;
     84 }
     85 
     86 bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
     87                                        SkIRect* dst) const {
     88     SkRect srcRect;
     89     ctm.mapRect(&srcRect, fSrcRect);
     90     SkIRect srcIRect;
     91     srcRect.roundOut(&srcIRect);
     92     srcIRect.join(src);
     93     *dst = srcIRect;
     94     return true;
     95 }
     96 
     97 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     98 SkTileImageFilter::SkTileImageFilter(SkReadBuffer& buffer)
     99   : INHERITED(1, buffer) {
    100     buffer.readRect(&fSrcRect);
    101     buffer.readRect(&fDstRect);
    102     buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
    103 }
    104 #endif
    105 
    106 SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) {
    107     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
    108     SkRect src, dst;
    109     buffer.readRect(&src);
    110     buffer.readRect(&dst);
    111     return Create(src, dst, common.getInput(0), common.uniqueID());
    112 }
    113 
    114 void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
    115     this->INHERITED::flatten(buffer);
    116     buffer.writeRect(fSrcRect);
    117     buffer.writeRect(fDstRect);
    118 }
    119