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 Region::const_iterator it = clip.begin();
47 Region::const_iterator const end = clip.end();
48 if (s.alpha>0 && (it != end)) {
49 const DisplayHardware& hw(graphicPlane(0).displayHardware());
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 glVertexPointer(2, GL_FLOAT, 0, mVertices);
65
66 while (it != end) {
67 const Rect& r = *it++;
68 const GLint sy = fbHeight - (r.top + r.height());
69 glScissor(r.left, sy, r.width(), r.height());
70 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
71 }
72 glDisable(GL_BLEND);
73 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
74 }
75 }
76
77 // ---------------------------------------------------------------------------
78
79 }; // namespace android
80