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
10 #include "SkReadBuffer.h"
11 #include "SkSpecialImage.h"
12 #include "SkWriteBuffer.h"
13
Make(sk_sp<SkImageFilter> outer,sk_sp<SkImageFilter> inner)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
computeFastBounds(const SkRect & src) const26 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
onFilterImage(SkSpecialImage * source,const Context & ctx,SkIPoint * offset) const33 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
onFilterBounds(const SkIRect & src,const SkMatrix & ctm,MapDirection direction) const64 SkIRect SkComposeImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
65 MapDirection direction) const {
66 SkImageFilter* outer = this->getInput(0);
67 SkImageFilter* inner = this->getInput(1);
68
69 return outer->filterBounds(inner->filterBounds(src, ctm, direction), ctm, direction);
70 }
71
CreateProc(SkReadBuffer & buffer)72 sk_sp<SkFlattenable> SkComposeImageFilter::CreateProc(SkReadBuffer& buffer) {
73 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
74 return SkComposeImageFilter::Make(common.getInput(0), common.getInput(1));
75 }
76
77 #ifndef SK_IGNORE_TO_STRING
toString(SkString * str) const78 void SkComposeImageFilter::toString(SkString* str) const {
79 SkImageFilter* outer = getInput(0);
80 SkImageFilter* inner = getInput(1);
81
82 str->appendf("SkComposeImageFilter: (");
83
84 str->appendf("outer: ");
85 outer->toString(str);
86
87 str->appendf("inner: ");
88 inner->toString(str);
89
90 str->appendf(")");
91 }
92 #endif
93