LayerDim.cpp revision 1b03149f3533db04e72e088d3fdd09d0087ca594 
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.h"
29
30namespace android {
31// ---------------------------------------------------------------------------
32
33LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
34        const sp<Client>& client)
35    : LayerBaseClient(flinger, display, client)
36{
37}
38
39LayerDim::~LayerDim()
40{
41}
42
43void LayerDim::onDraw(const DisplayHardware& hw, const Region& clip) const
44{
45    const State& s(drawingState());
46    if (s.alpha>0) {
47        const GLfloat alpha = s.alpha/255.0f;
48        const uint32_t fbHeight = hw.getHeight();
49        glDisable(GL_TEXTURE_EXTERNAL_OES);
50        glDisable(GL_TEXTURE_2D);
51
52        if (s.alpha == 0xFF) {
53            glDisable(GL_BLEND);
54        } else {
55            glEnable(GL_BLEND);
56            glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
57        }
58
59        glColor4f(0, 0, 0, alpha);
60
61        glVertexPointer(2, GL_FLOAT, 0, mVertices);
62        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
63
64        glDisable(GL_BLEND);
65        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
66    }
67}
68
69// ---------------------------------------------------------------------------
70
71}; // namespace android
72