LayerDim.cpp revision bce26daaaf4ea245ccb09d75a378d294e518d945 
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
33LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
34        const sp<Client>& client)
35    : LayerBaseClient(flinger, display, client)
36{
37}
38
39LayerDim::~LayerDim()
40{
41}
42
43void 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_DITHER);
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#if defined(GL_OES_EGL_image_external)
64        if (GLExtensions::getInstance().haveTextureExternal()) {
65            glDisable(GL_TEXTURE_EXTERNAL_OES);
66        }
67#endif
68        glDisable(GL_TEXTURE_2D);
69
70        glVertexPointer(2, GL_FLOAT, 0, mVertices);
71
72        while (it != end) {
73            const Rect& r = *it++;
74            const GLint sy = fbHeight - (r.top + r.height());
75            glScissor(r.left, sy, r.width(), r.height());
76            glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
77        }
78    }
79    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
80}
81
82// ---------------------------------------------------------------------------
83
84}; // namespace android
85