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