LayerDim.cpp revision 0d1561275e80073807ac04728951782d943f8882 
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
30namespace android {
31// ---------------------------------------------------------------------------
32
33bool LayerDim::sUseTexture;
34GLuint LayerDim::sTexId;
35EGLImageKHR LayerDim::sImage;
36int32_t LayerDim::sWidth;
37int32_t LayerDim::sHeight;
38
39// ---------------------------------------------------------------------------
40
41LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
42        const sp<Client>& client)
43    : LayerBaseClient(flinger, display, client)
44{
45}
46
47void 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
56LayerDim::~LayerDim()
57{
58}
59
60void 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
71        if (s.alpha == 0xFF) {
72            glDisable(GL_BLEND);
73        } else {
74            glEnable(GL_BLEND);
75            glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
76        }
77
78        glColor4f(0, 0, 0, alpha);
79
80#if defined(GL_OES_EGL_image_external)
81        if (GLExtensions::getInstance().haveTextureExternal()) {
82            glDisable(GL_TEXTURE_EXTERNAL_OES);
83        }
84#endif
85        glDisable(GL_TEXTURE_2D);
86
87        GLshort w = sWidth;
88        GLshort h = sHeight;
89        const GLshort vertices[4][2] = {
90                { 0, 0 },
91                { 0, h },
92                { w, h },
93                { w, 0 }
94        };
95        glVertexPointer(2, GL_SHORT, 0, vertices);
96
97        while (it != end) {
98            const Rect& r = *it++;
99            const GLint sy = fbHeight - (r.top + r.height());
100            glScissor(r.left, sy, r.width(), r.height());
101            glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
102        }
103    }
104    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
105}
106
107// ---------------------------------------------------------------------------
108
109}; // namespace android
110