LayerDim.cpp revision be48137beb68893870c26b7f8c59eac5d0bf517a 
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
33const uint32_t LayerDim::typeInfo = LayerBaseClient::typeInfo | 0x10;
34const char* const LayerDim::typeID = "LayerDim";
35
36bool LayerDim::sUseTexture;
37GLuint LayerDim::sTexId;
38EGLImageKHR LayerDim::sImage;
39int32_t LayerDim::sWidth;
40int32_t LayerDim::sHeight;
41
42// ---------------------------------------------------------------------------
43
44LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
45        const sp<Client>& client, int32_t i)
46    : LayerBaseClient(flinger, display, client, i)
47{
48}
49
50void LayerDim::initDimmer(SurfaceFlinger* flinger, uint32_t w, uint32_t h)
51{
52    sTexId = -1;
53    sImage = EGL_NO_IMAGE_KHR;
54    sWidth = w;
55    sHeight = h;
56    sUseTexture = false;
57
58#if defined(DIM_WITH_TEXTURE) && defined(EGL_ANDROID_image_native_buffer)
59
60#warning "using a texture to implement LayerDim"
61
62    /* On some h/w like msm7K, it is faster to use a texture because the
63     * software renderer will defer to copybit, for this to work we need to
64     * use an EGLImage texture so copybit can actually make use of it.
65     * This burns a full-screen worth of graphic memory.
66     */
67
68    const DisplayHardware& hw(flinger->graphicPlane(0).displayHardware());
69    uint32_t flags = hw.getFlags();
70
71    if (LIKELY(flags & DisplayHardware::DIRECT_TEXTURE)) {
72        sp<GraphicBuffer> buffer = new GraphicBuffer(w, h, PIXEL_FORMAT_RGB_565,
73                 GraphicBuffer::USAGE_SW_WRITE_OFTEN |
74                 GraphicBuffer::USAGE_HW_TEXTURE);
75
76        android_native_buffer_t* clientBuf = buffer->getNativeBuffer();
77
78        glGenTextures(1, &sTexId);
79        glBindTexture(GL_TEXTURE_2D, sTexId);
80
81        EGLDisplay dpy = eglGetCurrentDisplay();
82        sImage = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
83                EGL_NATIVE_BUFFER_ANDROID, (EGLClientBuffer)clientBuf, 0);
84        if (sImage == EGL_NO_IMAGE_KHR) {
85            LOGE("eglCreateImageKHR() failed. err=0x%4x", eglGetError());
86            return;
87        }
88
89        glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)sImage);
90        GLint error = glGetError();
91        if (error != GL_NO_ERROR) {
92            eglDestroyImageKHR(dpy, sImage);
93            LOGE("glEGLImageTargetTexture2DOES() failed. err=0x%4x", error);
94            return;
95        }
96
97        // initialize the texture with zeros
98        GGLSurface t;
99        buffer->lock(&t, GRALLOC_USAGE_SW_WRITE_OFTEN);
100        memset(t.data, 0, t.stride * t.height * 2);
101        buffer->unlock();
102        sUseTexture = true;
103    }
104#endif
105}
106
107LayerDim::~LayerDim()
108{
109}
110
111void LayerDim::onDraw(const Region& clip) const
112{
113    const State& s(drawingState());
114    Region::const_iterator it = clip.begin();
115    Region::const_iterator const end = clip.end();
116    if (s.alpha>0 && (it != end)) {
117        const DisplayHardware& hw(graphicPlane(0).displayHardware());
118        const GGLfixed alpha = (s.alpha << 16)/255;
119        const uint32_t fbHeight = hw.getHeight();
120        glDisable(GL_DITHER);
121        glEnable(GL_BLEND);
122        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
123        glColor4x(0, 0, 0, alpha);
124
125#if defined(DIM_WITH_TEXTURE) && defined(EGL_ANDROID_image_native_buffer)
126        if (sUseTexture) {
127            glBindTexture(GL_TEXTURE_2D, sTexId);
128            glEnable(GL_TEXTURE_2D);
129            glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
130            const GLshort texCoords[4][2] = {
131                    { 0,  0 },
132                    { 0,  1 },
133                    { 1,  1 },
134                    { 1,  0 }
135            };
136            glMatrixMode(GL_TEXTURE);
137            glLoadIdentity();
138            glEnableClientState(GL_TEXTURE_COORD_ARRAY);
139            glTexCoordPointer(2, GL_SHORT, 0, texCoords);
140        } else
141#endif
142        {
143            glDisable(GL_TEXTURE_2D);
144        }
145
146        GLshort w = sWidth;
147        GLshort h = sHeight;
148        const GLshort vertices[4][2] = {
149                { 0, 0 },
150                { 0, h },
151                { w, h },
152                { w, 0 }
153        };
154        glVertexPointer(2, GL_SHORT, 0, vertices);
155
156        while (it != end) {
157            const Rect& r = *it++;
158            const GLint sy = fbHeight - (r.top + r.height());
159            glScissor(r.left, sy, r.width(), r.height());
160            glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
161        }
162    }
163    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
164}
165
166// ---------------------------------------------------------------------------
167
168}; // namespace android
169