LayerDrawable.cpp revision c4fbada76aa840105553b2c2bce2204e673d2983 
1/*
2 * Copyright (C) 2016 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 "LayerDrawable.h"
18#include "SkColorFilter.h"
19#include "gl/GrGLTypes.h"
20
21namespace android {
22namespace uirenderer {
23namespace skiapipeline {
24
25void LayerDrawable::onDraw(SkCanvas* canvas) {
26    DrawLayer(canvas->getGrContext(), canvas, mLayer.get());
27}
28
29bool LayerDrawable::DrawLayer(GrContext* context, SkCanvas* canvas, Layer* layer) {
30    // transform the matrix based on the layer
31    int saveCount = -1;
32    if (!layer->getTransform().isIdentity()) {
33        saveCount = canvas->save();
34        SkMatrix transform;
35        layer->getTransform().copyTo(transform);
36        canvas->concat(transform);
37    }
38    GrGLTextureInfo externalTexture;
39    externalTexture.fTarget = layer->getRenderTarget();
40    externalTexture.fID = layer->getTextureId();
41    GrBackendTextureDesc textureDescription;
42    textureDescription.fWidth = layer->getWidth();
43    textureDescription.fHeight = layer->getHeight();
44    textureDescription.fConfig = kRGBA_8888_GrPixelConfig;
45    textureDescription.fOrigin = kTopLeft_GrSurfaceOrigin;
46    textureDescription.fTextureHandle = reinterpret_cast<GrBackendObject>(&externalTexture);
47    sk_sp<SkImage> layerImage = SkImage::MakeFromTexture(context, textureDescription);
48    if (layerImage) {
49        SkPaint paint;
50        paint.setAlpha(layer->getAlpha());
51        paint.setBlendMode(layer->getMode());
52        paint.setColorFilter(sk_ref_sp(layer->getColorFilter()));
53        canvas->drawImage(layerImage, 0, 0, &paint);
54    }
55    // restore the original matrix
56    if (saveCount >= 0) {
57        canvas->restoreToCount(saveCount);
58    }
59
60    return layerImage;
61}
62
63}; // namespace skiapipeline
64}; // namespace uirenderer
65}; // namespace android
66