LayerDrawable.cpp revision 021693b967a2c5556dddd183eb0247df4079e1ad 
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 "gl/GrGLTypes.h"
19
20namespace android {
21namespace uirenderer {
22namespace skiapipeline {
23
24void LayerDrawable::onDraw(SkCanvas* canvas) {
25    // transform the matrix based on the layer
26    int saveCount = -1;
27    if (!mLayer->getTransform().isIdentity()) {
28        saveCount = canvas->save();
29        SkMatrix transform;
30        mLayer->getTransform().copyTo(transform);
31        canvas->concat(transform);
32    }
33    GrGLTextureInfo externalTexture;
34    externalTexture.fTarget = mLayer->getRenderTarget();
35    externalTexture.fID = mLayer->getTextureId();
36    GrContext* context = canvas->getGrContext();
37    GrBackendTextureDesc textureDescription;
38    textureDescription.fWidth = mLayer->getWidth();
39    textureDescription.fHeight = mLayer->getHeight();
40    textureDescription.fConfig = kRGBA_8888_GrPixelConfig;
41    textureDescription.fOrigin = kTopLeft_GrSurfaceOrigin;
42    textureDescription.fTextureHandle = reinterpret_cast<GrBackendObject>(&externalTexture);
43    sk_sp<SkImage> layerImage(SkImage::NewFromTexture(context, textureDescription));
44    if (layerImage) {
45        SkPaint paint;
46        paint.setAlpha(mLayer->getAlpha());
47        paint.setBlendMode(mLayer->getMode());
48        paint.setColorFilter(mLayer->getColorFilter());
49        canvas->drawImage(layerImage, 0, 0, &paint);
50    }
51    // restore the original matrix
52    if (saveCount >= 0) {
53        canvas->restoreToCount(saveCount);
54    }
55}
56
57}; // namespace skiapipeline
58}; // namespace uirenderer
59}; // namespace android
60