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      1 /*
      2  * Copyright (C) 2011 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 #ifndef ANDROID_HWUI_DRAW_GL_INFO_H
     18 #define ANDROID_HWUI_DRAW_GL_INFO_H
     19 
     20 namespace android {
     21 namespace uirenderer {
     22 
     23 /**
     24  * Structure used by OpenGLRenderer::callDrawGLFunction() to pass and
     25  * receive data from OpenGL functors.
     26  */
     27 struct DrawGlInfo {
     28     // Input: current clip rect
     29     int clipLeft;
     30     int clipTop;
     31     int clipRight;
     32     int clipBottom;
     33 
     34     // Input: current width/height of destination surface
     35     int width;
     36     int height;
     37 
     38     // Input: is the render target an FBO
     39     bool isLayer;
     40 
     41     // Input: current transform matrix, in OpenGL format
     42     float transform[16];
     43 
     44     // Output: dirty region to redraw
     45     float dirtyLeft;
     46     float dirtyTop;
     47     float dirtyRight;
     48     float dirtyBottom;
     49 
     50     /**
     51      * Values used as the "what" parameter of the functor.
     52      */
     53     enum Mode {
     54         // Indicates that the functor is called to perform a draw
     55         kModeDraw,
     56         // Indicates the the functor is called only to perform
     57         // processing and that no draw should be attempted
     58         kModeProcess,
     59         // Same as kModeProcess, however there is no GL context because it was
     60         // lost or destroyed
     61         kModeProcessNoContext,
     62         // Invoked every time the UI thread pushes over a frame to the render thread
     63         // *and the owning view has a dirty display list*. This is a signal to sync
     64         // any data that needs to be shared between the UI thread and the render thread.
     65         // During this time the UI thread is blocked.
     66         kModeSync
     67     };
     68 
     69     /**
     70      * Values used by OpenGL functors to tell the framework
     71      * what to do next.
     72      */
     73     enum Status {
     74         // The functor is done
     75         kStatusDone = 0x0,
     76         // DisplayList actually issued GL drawing commands.
     77         // This is used to signal the HardwareRenderer that the
     78         // buffers should be flipped - otherwise, there were no
     79         // changes to the buffer, so no need to flip. Some hardware
     80         // has issues with stale buffer contents when no GL
     81         // commands are issued.
     82         kStatusDrew = 0x4
     83     };
     84 };  // struct DrawGlInfo
     85 
     86 };  // namespace uirenderer
     87 };  // namespace android
     88 
     89 #endif  // ANDROID_HWUI_DRAW_GL_INFO_H
     90