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
33 namespace android {
34 // ---------------------------------------------------------------------------
35
LayerDim(SurfaceFlinger * flinger,const sp<Client> & client)36 LayerDim::LayerDim(SurfaceFlinger* flinger, const sp<Client>& client)
37 : LayerBaseClient(flinger, client)
38 {
39 }
40
~LayerDim()41 LayerDim::~LayerDim()
42 {
43 }
44
onDraw(const sp<const DisplayDevice> & hw,const Region & clip) const45 void LayerDim::onDraw(const sp<const DisplayDevice>& hw, const Region& clip) const
46 {
47 const State& s(drawingState());
48 if (s.alpha>0) {
49 const GLfloat alpha = s.alpha/255.0f;
50 const uint32_t fbHeight = hw->getHeight();
51 glDisable(GL_TEXTURE_EXTERNAL_OES);
52 glDisable(GL_TEXTURE_2D);
53
54 if (s.alpha == 0xFF) {
55 glDisable(GL_BLEND);
56 } else {
57 glEnable(GL_BLEND);
58 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
59 }
60
61 glColor4f(0, 0, 0, alpha);
62
63 LayerMesh mesh;
64 computeGeometry(hw, &mesh);
65
66 glVertexPointer(2, GL_FLOAT, 0, mesh.getVertices());
67 glDrawArrays(GL_TRIANGLE_FAN, 0, mesh.getVertexCount());
68
69 glDisable(GL_BLEND);
70 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
71 }
72 }
73
74 // ---------------------------------------------------------------------------
75
76 }; // namespace android
77