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