1 /*
2 * Copyright (C) 2007 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 <stdlib.h>
18 #include <stdint.h>
19 #include <sys/types.h>
20
21 #include <utils/Errors.h>
22 #include <utils/Log.h>
23
24 #include <ui/GraphicBuffer.h>
25
26 #include "LayerDim.h"
27 #include "SurfaceFlinger.h"
28 #include "DisplayHardware/DisplayHardware.h"
29
30 namespace android {
31 // ---------------------------------------------------------------------------
32
LayerDim(SurfaceFlinger * flinger,DisplayID display,const sp<Client> & client)33 LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
34 const sp<Client>& client)
35 : LayerBaseClient(flinger, display, client)
36 {
37 }
38
~LayerDim()39 LayerDim::~LayerDim()
40 {
41 }
42
onDraw(const Region & clip) const43 void LayerDim::onDraw(const Region& clip) const
44 {
45 const State& s(drawingState());
46 if (s.alpha>0) {
47 const DisplayHardware& hw(graphicPlane(0).displayHardware());
48 const GLfloat alpha = s.alpha/255.0f;
49 const uint32_t fbHeight = hw.getHeight();
50 glDisable(GL_TEXTURE_EXTERNAL_OES);
51 glDisable(GL_TEXTURE_2D);
52
53 if (s.alpha == 0xFF) {
54 glDisable(GL_BLEND);
55 } else {
56 glEnable(GL_BLEND);
57 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
58 }
59
60 glColor4f(0, 0, 0, alpha);
61
62 glVertexPointer(2, GL_FLOAT, 0, mVertices);
63 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
64
65 glDisable(GL_BLEND);
66 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
67 }
68 }
69
70 // ---------------------------------------------------------------------------
71
72 }; // namespace android
73