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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 "SkComposeImageFilter.h"
      9 #include "SkColorSpaceXformer.h"
     10 #include "SkImageFilterPriv.h"
     11 #include "SkReadBuffer.h"
     12 #include "SkSpecialImage.h"
     13 #include "SkWriteBuffer.h"
     14 
     15 sk_sp<SkImageFilter> SkComposeImageFilter::Make(sk_sp<SkImageFilter> outer,
     16                                                 sk_sp<SkImageFilter> inner) {
     17     if (!outer) {
     18         return inner;
     19     }
     20     if (!inner) {
     21         return outer;
     22     }
     23     sk_sp<SkImageFilter> inputs[2] = { std::move(outer), std::move(inner) };
     24     return sk_sp<SkImageFilter>(new SkComposeImageFilter(inputs));
     25 }
     26 
     27 SkRect SkComposeImageFilter::computeFastBounds(const SkRect& src) const {
     28     SkImageFilter* outer = this->getInput(0);
     29     SkImageFilter* inner = this->getInput(1);
     30 
     31     return outer->computeFastBounds(inner->computeFastBounds(src));
     32 }
     33 
     34 sk_sp<SkSpecialImage> SkComposeImageFilter::onFilterImage(SkSpecialImage* source,
     35                                                           const Context& ctx,
     36                                                           SkIPoint* offset) const {
     37     // The bounds passed to the inner filter must be filtered by the outer
     38     // filter, so that the inner filter produces the pixels that the outer
     39     // filter requires as input. This matters if the outer filter moves pixels.
     40     SkIRect innerClipBounds;
     41     innerClipBounds = this->getInput(0)->filterBounds(ctx.clipBounds(), ctx.ctm());
     42     Context innerContext(ctx.ctm(), innerClipBounds, ctx.cache(), ctx.outputProperties());
     43     SkIPoint innerOffset = SkIPoint::Make(0, 0);
     44     sk_sp<SkSpecialImage> inner(this->filterInput(1, source, innerContext, &innerOffset));
     45     if (!inner) {
     46         return nullptr;
     47     }
     48 
     49     SkMatrix outerMatrix(ctx.ctm());
     50     outerMatrix.postTranslate(SkIntToScalar(-innerOffset.x()), SkIntToScalar(-innerOffset.y()));
     51     SkIRect clipBounds = ctx.clipBounds();
     52     clipBounds.offset(-innerOffset.x(), -innerOffset.y());
     53     Context outerContext(outerMatrix, clipBounds, ctx.cache(), ctx.outputProperties());
     54 
     55     SkIPoint outerOffset = SkIPoint::Make(0, 0);
     56     sk_sp<SkSpecialImage> outer(this->filterInput(0, inner.get(), outerContext, &outerOffset));
     57     if (!outer) {
     58         return nullptr;
     59     }
     60 
     61     *offset = innerOffset + outerOffset;
     62     return outer;
     63 }
     64 
     65 sk_sp<SkImageFilter> SkComposeImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
     66     SkASSERT(2 == this->countInputs() && this->getInput(0) && this->getInput(1));
     67 
     68     auto input0 = xformer->apply(this->getInput(0));
     69     auto input1 = xformer->apply(this->getInput(1));
     70     if (input0.get() != this->getInput(0) || input1.get() != this->getInput(1)) {
     71         return SkComposeImageFilter::Make(std::move(input0), std::move(input1));
     72     }
     73     return this->refMe();
     74 }
     75 
     76 SkIRect SkComposeImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
     77                                              MapDirection direction) const {
     78     SkImageFilter* outer = this->getInput(0);
     79     SkImageFilter* inner = this->getInput(1);
     80 
     81     return outer->filterBounds(inner->filterBounds(src, ctm, direction), ctm, direction);
     82 }
     83 
     84 sk_sp<SkFlattenable> SkComposeImageFilter::CreateProc(SkReadBuffer& buffer) {
     85     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
     86     return SkComposeImageFilter::Make(common.getInput(0), common.getInput(1));
     87 }
     88 
     89 #ifndef SK_IGNORE_TO_STRING
     90 void SkComposeImageFilter::toString(SkString* str) const {
     91     SkImageFilter* outer = getInput(0);
     92     SkImageFilter* inner = getInput(1);
     93 
     94     str->appendf("SkComposeImageFilter: (");
     95 
     96     str->appendf("outer: ");
     97     outer->toString(str);
     98 
     99     str->appendf("inner: ");
    100     inner->toString(str);
    101 
    102     str->appendf(")");
    103 }
    104 #endif
    105