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 41 LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display, 42 const sp<Client>& client) 43 : LayerBaseClient(flinger, display, client) 44 { 45 } 46 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 56 LayerDim::~LayerDim() 57 { 58 } 59 60 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