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      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