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      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 "SkOffsetImageFilter.h"
     13 #include "SkReadBuffer.h"
     14 #include "SkWriteBuffer.h"
     15 #include "SkMatrix.h"
     16 #include "SkPaint.h"
     17 #include "SkShader.h"
     18 #include "SkValidationUtils.h"
     19 
     20 SkImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect,
     21                                          SkImageFilter* input) {
     22     if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
     23         return nullptr;
     24     }
     25     if (srcRect.width() == dstRect.width() && srcRect.height() == dstRect.height()) {
     26         SkRect ir = dstRect;
     27         if (!ir.intersect(srcRect)) {
     28             return SkSafeRef(input);
     29         }
     30         CropRect cropRect(ir);
     31         return SkOffsetImageFilter::Create(dstRect.x() - srcRect.x(),
     32                                            dstRect.y() - srcRect.y(),
     33                                            input, &cropRect);
     34     }
     35     return new SkTileImageFilter(srcRect, dstRect, input);
     36 }
     37 
     38 bool SkTileImageFilter::onFilterImageDeprecated(Proxy* proxy, const SkBitmap& src,
     39                                                 const Context& ctx,
     40                                                 SkBitmap* dst, SkIPoint* offset) const {
     41     SkBitmap source = src;
     42     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     43     if (!this->filterInputDeprecated(0, proxy, src, ctx, &source, &srcOffset)) {
     44         return false;
     45     }
     46 
     47     SkRect dstRect;
     48     ctx.ctm().mapRect(&dstRect, fDstRect);
     49     if (!dstRect.intersect(SkRect::Make(ctx.clipBounds()))) {
     50         offset->fX = offset->fY = 0;
     51         return true;
     52     }
     53     const SkIRect dstIRect = dstRect.roundOut();
     54     int w = dstIRect.width();
     55     int h = dstIRect.height();
     56     if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
     57         return false;
     58     }
     59 
     60     SkRect srcRect;
     61     ctx.ctm().mapRect(&srcRect, fSrcRect);
     62     SkIRect srcIRect;
     63     srcRect.roundOut(&srcIRect);
     64     srcIRect.offset(-srcOffset);
     65     SkBitmap subset;
     66     SkIRect srcBounds;
     67     source.getBounds(&srcBounds);
     68 
     69     if (!SkIRect::Intersects(srcIRect, srcBounds)) {
     70         offset->fX = offset->fY = 0;
     71         return true;
     72     }
     73     if (srcBounds.contains(srcIRect)) {
     74         if (!source.extractSubset(&subset, srcIRect)) {
     75             return false;
     76         }
     77     } else {
     78         SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(srcIRect.width(),
     79                                                               srcIRect.height(),
     80                                                               kPossible_TileUsage));
     81         if (!device) {
     82             return false;
     83         }
     84         SkCanvas canvas(device);
     85         canvas.drawBitmap(src, SkIntToScalar(srcOffset.x()),
     86                                SkIntToScalar(srcOffset.y()));
     87         subset = device->accessBitmap(false);
     88     }
     89     SkASSERT(subset.width() == srcIRect.width());
     90     SkASSERT(subset.height() == srcIRect.height());
     91 
     92     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
     93     if (nullptr == device.get()) {
     94         return false;
     95     }
     96     SkCanvas canvas(device);
     97     SkPaint paint;
     98     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     99 
    100     SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset,
    101                                   SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
    102     paint.setShader(shader);
    103     canvas.translate(-dstRect.fLeft, -dstRect.fTop);
    104     canvas.drawRect(dstRect, paint);
    105     *dst = device->accessBitmap(false);
    106     offset->fX = dstIRect.fLeft;
    107     offset->fY = dstIRect.fTop;
    108     return true;
    109 }
    110 
    111 void SkTileImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
    112                                           SkIRect* dst, MapDirection direction) const {
    113     SkRect rect = kReverse_MapDirection == direction ? fSrcRect : fDstRect;
    114     ctm.mapRect(&rect);
    115     rect.roundOut(dst);
    116 }
    117 
    118 bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
    119                                        SkIRect* dst, MapDirection direction) const {
    120     // Don't recurse into inputs.
    121     *dst = src;
    122     return true;
    123 }
    124 
    125 void SkTileImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
    126     *dst = fDstRect;
    127 }
    128 
    129 SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) {
    130     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
    131     SkRect src, dst;
    132     buffer.readRect(&src);
    133     buffer.readRect(&dst);
    134     return Create(src, dst, common.getInput(0));
    135 }
    136 
    137 void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
    138     this->INHERITED::flatten(buffer);
    139     buffer.writeRect(fSrcRect);
    140     buffer.writeRect(fDstRect);
    141 }
    142 
    143 #ifndef SK_IGNORE_TO_STRING
    144 void SkTileImageFilter::toString(SkString* str) const {
    145     str->appendf("SkTileImageFilter: (");
    146     str->appendf("src: %.2f %.2f %.2f %.2f",
    147                  fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom);
    148     str->appendf(" dst: %.2f %.2f %.2f %.2f",
    149                  fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
    150     if (this->getInput(0)) {
    151         str->appendf("input: (");
    152         this->getInput(0)->toString(str);
    153         str->appendf(")");
    154     }
    155     str->append(")");
    156 }
    157 #endif
    158