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
33 bool LayerDim::sUseTexture;
34 GLuint LayerDim::sTexId;
35 EGLImageKHR LayerDim::sImage;
36 int32_t LayerDim::sWidth;
37 int32_t LayerDim::sHeight;
38
39 // ---------------------------------------------------------------------------
40
LayerDim(SurfaceFlinger * flinger,DisplayID display,const sp<Client> & client)41 LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
42 const sp<Client>& client)
43 : LayerBaseClient(flinger, display, client)
44 {
45 }
46
initDimmer(SurfaceFlinger * flinger,uint32_t w,uint32_t h)47 void LayerDim::initDimmer(SurfaceFlinger* flinger, uint32_t w, uint32_t h)
48 {
49 sTexId = -1;
50 sImage = EGL_NO_IMAGE_KHR;
51 sWidth = w;
52 sHeight = h;
53 sUseTexture = false;
54 }
55
~LayerDim()56 LayerDim::~LayerDim()
57 {
58 }
59
onDraw(const Region & clip) const60 void LayerDim::onDraw(const Region& clip) const
61 {
62 const State& s(drawingState());
63 Region::const_iterator it = clip.begin();
64 Region::const_iterator const end = clip.end();
65 if (s.alpha>0 && (it != end)) {
66 const DisplayHardware& hw(graphicPlane(0).displayHardware());
67 const GLfloat alpha = s.alpha/255.0f;
68 const uint32_t fbHeight = hw.getHeight();
69 glDisable(GL_DITHER);
70 glEnable(GL_BLEND);
71 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
72 glColor4f(0, 0, 0, alpha);
73
74 #if defined(GL_OES_EGL_image_external)
75 if (GLExtensions::getInstance().haveTextureExternal()) {
76 glDisable(GL_TEXTURE_EXTERNAL_OES);
77 }
78 #endif
79 glDisable(GL_TEXTURE_2D);
80
81 GLshort w = sWidth;
82 GLshort h = sHeight;
83 const GLshort vertices[4][2] = {
84 { 0, 0 },
85 { 0, h },
86 { w, h },
87 { w, 0 }
88 };
89 glVertexPointer(2, GL_SHORT, 0, vertices);
90
91 while (it != end) {
92 const Rect& r = *it++;
93 const GLint sy = fbHeight - (r.top + r.height());
94 glScissor(r.left, sy, r.width(), r.height());
95 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
96 }
97 }
98 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
99 }
100
101 // ---------------------------------------------------------------------------
102
103 }; // namespace android
104