/src/skia/modules/sksg/src/SkSGMaskEffect.cpp
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1 | | /* |
2 | | * Copyright 2018 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 "modules/sksg/include/SkSGMaskEffect.h" |
9 | | |
10 | | #include "include/core/SkBlendMode.h" |
11 | | #include "include/core/SkCanvas.h" |
12 | | #include "include/core/SkColorFilter.h" |
13 | | #include "include/core/SkPaint.h" |
14 | | #include "include/effects/SkLumaColorFilter.h" |
15 | | #include "include/private/base/SkAssert.h" |
16 | | #include "include/private/base/SkTo.h" |
17 | | #include "modules/sksg/include/SkSGNode.h" |
18 | | |
19 | | class SkMatrix; |
20 | | struct SkPoint; |
21 | | |
22 | | namespace sksg { |
23 | | |
24 | 47.0k | static bool is_inverted(sksg::MaskEffect::Mode mode) { |
25 | 47.0k | return static_cast<uint32_t>(mode) & 1; |
26 | 47.0k | } |
27 | | |
28 | 14.1k | static bool is_luma(sksg::MaskEffect::Mode mode) { |
29 | 14.1k | return static_cast<uint32_t>(mode) & 2; |
30 | 14.1k | } |
31 | | |
32 | | MaskEffect::MaskEffect(sk_sp<RenderNode> child, sk_sp<RenderNode> mask, Mode mode) |
33 | | : INHERITED(std::move(child)) |
34 | | , fMaskNode(std::move(mask)) |
35 | 31.1k | , fMaskMode(mode) { |
36 | 31.1k | this->observeInval(fMaskNode); |
37 | 31.1k | } |
38 | | |
39 | 31.1k | MaskEffect::~MaskEffect() { |
40 | 31.1k | this->unobserveInval(fMaskNode); |
41 | 31.1k | } |
42 | | |
43 | 14.1k | void MaskEffect::onRender(SkCanvas* canvas, const RenderContext* ctx) const { |
44 | 14.1k | SkAutoCanvasRestore acr(canvas, false); |
45 | | |
46 | | // The mask mode covers two independent bits. |
47 | | // |
48 | | // - mask source controls how the mask coverage is generated: |
49 | | // * alpha => coverage = mask_alpha |
50 | | // * luma => coverage = luma(mask_rgb) |
51 | | // |
52 | | // - mask type controls how the mask coverage is interpreted: |
53 | | // * normal => coverage' = coverage |
54 | | // * inverted => coverage' = 1 - coverage |
55 | | |
56 | 14.1k | { |
57 | | // Outer layer: mask coverage stored in the alpha channel. |
58 | 14.1k | SkPaint mask_layer_paint; |
59 | 14.1k | if (ctx) { |
60 | | // Apply all optional context overrides upfront. |
61 | 10.9k | ctx->modulatePaint(canvas->getTotalMatrix(), &mask_layer_paint); |
62 | 10.9k | } |
63 | | |
64 | 14.1k | RenderContext mask_render_context; |
65 | 14.1k | if (is_luma(fMaskMode)) { |
66 | 6.16k | mask_render_context.fColorFilter = SkLumaColorFilter::Make(); |
67 | 6.16k | } |
68 | | |
69 | | // TODO: could be an A8 layer? |
70 | 14.1k | canvas->saveLayer(this->bounds(), &mask_layer_paint); |
71 | 14.1k | fMaskNode->render(canvas, &mask_render_context); |
72 | | |
73 | 14.1k | { |
74 | | // Inner layer: masked content. |
75 | 14.1k | SkPaint content_layer_paint; |
76 | 14.1k | content_layer_paint.setBlendMode(is_inverted(fMaskMode) ? SkBlendMode::kSrcOut |
77 | 14.1k | : SkBlendMode::kSrcIn); |
78 | 14.1k | canvas->saveLayer(this->bounds(), &content_layer_paint); |
79 | | |
80 | 14.1k | this->INHERITED::onRender(canvas, nullptr); |
81 | 14.1k | } |
82 | 14.1k | } |
83 | 14.1k | } |
84 | | |
85 | 0 | const RenderNode* MaskEffect::onNodeAt(const SkPoint& p) const { |
86 | 0 | const auto mask_hit = (SkToBool(fMaskNode->nodeAt(p)) == !is_inverted(fMaskMode)); |
87 | |
|
88 | 0 | if (!mask_hit) { |
89 | 0 | return nullptr; |
90 | 0 | } |
91 | | |
92 | 0 | return this->INHERITED::onNodeAt(p); |
93 | 0 | } |
94 | | |
95 | 32.8k | SkRect MaskEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) { |
96 | 32.8k | SkASSERT(this->hasInval()); |
97 | | |
98 | 32.8k | const auto maskBounds = fMaskNode->revalidate(ic, ctm); |
99 | 32.8k | auto childBounds = this->INHERITED::onRevalidate(ic, ctm); |
100 | | |
101 | 32.8k | return (is_inverted(fMaskMode) || childBounds.intersect(maskBounds)) |
102 | 32.8k | ? childBounds |
103 | 32.8k | : SkRect::MakeEmpty(); |
104 | 32.8k | } |
105 | | |
106 | | } // namespace sksg |