1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "BackdropFilterDrawable.h"
18
19 #include <SkImage.h>
20 #include <SkSurface.h>
21
22 #include "RenderNode.h"
23 #include "RenderNodeDrawable.h"
24 #ifdef __ANDROID__
25 #include "include/gpu/ganesh/SkImageGanesh.h"
26 #endif
27
28 namespace android {
29 namespace uirenderer {
30 namespace skiapipeline {
31
onDraw(SkCanvas * canvas)32 void BackdropFilterDrawable::onDraw(SkCanvas* canvas) {
33 const RenderProperties& properties = mTargetRenderNode->properties();
34 auto* backdropFilter = properties.layerProperties().getBackdropImageFilter();
35 auto* surface = canvas->getSurface();
36 if (!backdropFilter || !surface) {
37 return;
38 }
39
40 SkRect srcBounds = SkRect::MakeWH(properties.getWidth(), properties.getHeight());
41
42 float alphaMultiplier = 1.0f;
43 RenderNodeDrawable::setViewProperties(properties, canvas, &alphaMultiplier, true);
44 SkPaint paint;
45 paint.setAlpha(properties.layerProperties().alpha() * alphaMultiplier);
46
47 SkRect surfaceSubset;
48 canvas->getTotalMatrix().mapRect(&surfaceSubset, srcBounds);
49 if (!surfaceSubset.intersect(SkRect::MakeWH(surface->width(), surface->height()))) {
50 return;
51 }
52
53 auto backdropImage = surface->makeImageSnapshot(surfaceSubset.roundOut());
54
55 SkIRect imageBounds = SkIRect::MakeWH(backdropImage->width(), backdropImage->height());
56 SkIPoint offset;
57 SkIRect imageSubset;
58
59 #ifdef __ANDROID__
60 if (canvas->recordingContext()) {
61 backdropImage =
62 SkImages::MakeWithFilter(canvas->recordingContext(), backdropImage, backdropFilter,
63 imageBounds, imageBounds, &imageSubset, &offset);
64 } else
65 #endif
66 {
67 backdropImage = SkImages::MakeWithFilter(backdropImage, backdropFilter, imageBounds,
68 imageBounds, &imageSubset, &offset);
69 }
70
71 canvas->save();
72 canvas->resetMatrix();
73 canvas->drawImageRect(backdropImage, SkRect::Make(imageSubset), surfaceSubset,
74 SkSamplingOptions(SkFilterMode::kLinear), &paint,
75 SkCanvas::kFast_SrcRectConstraint);
76 canvas->restore();
77 }
78
79 } // namespace skiapipeline
80 } // namespace uirenderer
81 } // namespace android
82