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 "GLFunctorDrawable.h"
18#include "GlFunctorLifecycleListener.h"
19#include "RenderNode.h"
20#include "SkClipStack.h"
21#include <private/hwui/DrawGlInfo.h>
22#include <GrContext.h>
23
24namespace android {
25namespace uirenderer {
26namespace skiapipeline {
27
28GLFunctorDrawable::~GLFunctorDrawable() {
29    if(mListener.get() != nullptr) {
30        mListener->onGlFunctorReleased(mFunctor);
31    }
32}
33
34void GLFunctorDrawable::syncFunctor() const {
35    (*mFunctor)(DrawGlInfo::kModeSync, nullptr);
36}
37
38static void setScissor(int viewportHeight, const SkIRect& clip) {
39    SkASSERT(!clip.isEmpty());
40    // transform to Y-flipped GL space, and prevent negatives
41    GLint y = viewportHeight - clip.fBottom;
42    GLint height = (viewportHeight - clip.fTop) - y;
43    glScissor(clip.fLeft, y, clip.width(), height);
44}
45
46void GLFunctorDrawable::onDraw(SkCanvas* canvas) {
47    if (canvas->getGrContext() == nullptr) {
48        SkDEBUGF(("Attempting to draw GLFunctor into an unsupported surface"));
49        return;
50    }
51
52    canvas->flush();
53
54    if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaVulkan) {
55        canvas->clear(SK_ColorRED);
56        return;
57    }
58
59    SkImageInfo canvasInfo = canvas->imageInfo();
60    SkMatrix44 mat4(canvas->getTotalMatrix());
61
62    SkIRect ibounds = canvas->getDeviceClipBounds();
63
64    DrawGlInfo info;
65    info.clipLeft = ibounds.fLeft;
66    info.clipTop = ibounds.fTop;
67    info.clipRight = ibounds.fRight;
68    info.clipBottom = ibounds.fBottom;
69    //   info.isLayer = hasLayer();
70    info.isLayer = false;
71    info.width = canvasInfo.width();
72    info.height = canvasInfo.height();
73    mat4.asColMajorf(&info.transform[0]);
74
75    //apply a simple clip with a scissor or a complex clip with a stencil
76    SkRegion clipRegion;
77    canvas->temporary_internal_getRgnClip(&clipRegion);
78    if (CC_UNLIKELY(clipRegion.isComplex())) {
79        //It is only a temporary solution to use a scissor to draw the stencil.
80        //There is a bug 31489986 to implement efficiently non-rectangular clips.
81        glDisable(GL_SCISSOR_TEST);
82        glDisable(GL_STENCIL_TEST);
83        glStencilMask(0xff);
84        glClearStencil(0);
85        glClear(GL_STENCIL_BUFFER_BIT);
86        glEnable(GL_SCISSOR_TEST);
87        SkRegion::Cliperator it(clipRegion, ibounds);
88        while (!it.done()) {
89            setScissor(info.height, it.rect());
90            glClearStencil(0x1);
91            glClear(GL_STENCIL_BUFFER_BIT);
92            it.next();
93        }
94        glDisable(GL_SCISSOR_TEST);
95        glStencilFunc(GL_EQUAL, 0x1, 0xff);
96        glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
97        glEnable(GL_STENCIL_TEST);
98    } else if (clipRegion.isEmpty()) {
99        glDisable(GL_STENCIL_TEST);
100        glDisable(GL_SCISSOR_TEST);
101    } else {
102        glDisable(GL_STENCIL_TEST);
103        glEnable(GL_SCISSOR_TEST);
104        setScissor(info.height, clipRegion.getBounds());
105    }
106
107    (*mFunctor)(DrawGlInfo::kModeDraw, &info);
108
109    canvas->getGrContext()->resetContext();
110 }
111
112}; // namespace skiapipeline
113}; // namespace uirenderer
114}; // namespace android
115