LayerDrawable.cpp revision 45ec62ba72c5017fae7d8baab20bfb0d4c99c627 
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 "GlLayer.h"
18#include "LayerDrawable.h"
19#include "VkLayer.h"
20
21#include "SkColorFilter.h"
22#include "SkSurface.h"
23#include "gl/GrGLTypes.h"
24
25namespace android {
26namespace uirenderer {
27namespace skiapipeline {
28
29void LayerDrawable::onDraw(SkCanvas* canvas) {
30    DrawLayer(canvas->getGrContext(), canvas, mLayer.get());
31}
32
33bool LayerDrawable::DrawLayer(GrContext* context, SkCanvas* canvas, Layer* layer) {
34    // transform the matrix based on the layer
35    int saveCount = -1;
36    if (!layer->getTransform().isIdentity()) {
37        saveCount = canvas->save();
38        SkMatrix transform;
39        layer->getTransform().copyTo(transform);
40        canvas->concat(transform);
41    }
42
43    sk_sp<SkImage> layerImage;
44    if (layer->getApi() == Layer::Api::OpenGL) {
45        GlLayer* glLayer = static_cast<GlLayer*>(layer);
46        GrGLTextureInfo externalTexture;
47        externalTexture.fTarget = glLayer->getRenderTarget();
48        externalTexture.fID = glLayer->getTextureId();
49        GrBackendTextureDesc textureDescription;
50        textureDescription.fWidth = glLayer->getWidth();
51        textureDescription.fHeight = glLayer->getHeight();
52        textureDescription.fConfig = kRGBA_8888_GrPixelConfig;
53        textureDescription.fOrigin = kTopLeft_GrSurfaceOrigin;
54        textureDescription.fTextureHandle = reinterpret_cast<GrBackendObject>(&externalTexture);
55        layerImage = SkImage::MakeFromTexture(context, textureDescription);
56    } else {
57        SkASSERT(layer->getApi() == Layer::Api::Vulkan);
58        VkLayer* vkLayer = static_cast<VkLayer*>(layer);
59        canvas->clear(SK_ColorGREEN);
60        layerImage = vkLayer->getImage();
61    }
62
63    if (layerImage) {
64        SkPaint paint;
65        paint.setAlpha(layer->getAlpha());
66        paint.setBlendMode(layer->getMode());
67        paint.setColorFilter(sk_ref_sp(layer->getColorFilter()));
68        canvas->drawImage(layerImage, 0, 0, &paint);
69    }
70    // restore the original matrix
71    if (saveCount >= 0) {
72        canvas->restoreToCount(saveCount);
73    }
74
75    return layerImage;
76}
77
78}; // namespace skiapipeline
79}; // namespace uirenderer
80}; // namespace android
81