LayerDim.cpp revision 4297734c1156fd8ede7e9c61b1e439f9e1c18cd9 
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 <GLES/gl.h>
22#include <GLES/glext.h>
23
24#include <utils/Errors.h>
25#include <utils/Log.h>
26
27#include <ui/GraphicBuffer.h>
28
29#include "LayerDim.h"
30#include "SurfaceFlinger.h"
31#include "DisplayDevice.h"
32
33namespace android {
34// ---------------------------------------------------------------------------
35
36LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
37        const sp<Client>& client)
38    : LayerBaseClient(flinger, display, client)
39{
40}
41
42LayerDim::~LayerDim()
43{
44}
45
46void LayerDim::onDraw(const sp<const DisplayDevice>& hw, const Region& clip) const
47{
48    const State& s(drawingState());
49    if (s.alpha>0) {
50        const GLfloat alpha = s.alpha/255.0f;
51        const uint32_t fbHeight = hw->getHeight();
52        glDisable(GL_TEXTURE_EXTERNAL_OES);
53        glDisable(GL_TEXTURE_2D);
54
55        if (s.alpha == 0xFF) {
56            glDisable(GL_BLEND);
57        } else {
58            glEnable(GL_BLEND);
59            glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
60        }
61
62        glColor4f(0, 0, 0, alpha);
63
64        LayerMesh mesh;
65        computeGeometry(hw, &mesh);
66
67        glVertexPointer(2, GL_FLOAT, 0, mesh.getVertices());
68        glDrawArrays(GL_TRIANGLE_FAN, 0, mesh.getVertexCount());
69
70        glDisable(GL_BLEND);
71        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
72    }
73}
74
75// ---------------------------------------------------------------------------
76
77}; // namespace android
78