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      1 /*
      2  * Copyright (C) 2010 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 <errno.h>
     18 #include <fcntl.h>
     19 #include <malloc.h>
     20 #include <string.h>
     21 
     22 #include <cutils/atomic.h>
     23 #include <log/log.h>
     24 
     25 #include <hardware/hardware.h>
     26 #include <hardware/hwcomposer.h>
     27 
     28 #include <EGL/egl.h>
     29 
     30 /*****************************************************************************/
     31 
     32 struct hwc_context_t {
     33     hwc_composer_device_1_t device;
     34     /* our private state goes below here */
     35 };
     36 
     37 static int hwc_device_open(const struct hw_module_t* module, const char* name,
     38         struct hw_device_t** device);
     39 
     40 static struct hw_module_methods_t hwc_module_methods = {
     41     .open = hwc_device_open
     42 };
     43 
     44 hwc_module_t HAL_MODULE_INFO_SYM = {
     45     .common = {
     46         .tag = HARDWARE_MODULE_TAG,
     47         .version_major = 1,
     48         .version_minor = 0,
     49         .id = HWC_HARDWARE_MODULE_ID,
     50         .name = "Sample hwcomposer module",
     51         .author = "The Android Open Source Project",
     52         .methods = &hwc_module_methods,
     53     }
     54 };
     55 
     56 /*****************************************************************************/
     57 
     58 #if 0
     59 static void dump_layer(hwc_layer_1_t const* l) {
     60     ALOGD("\ttype=%d, flags=%08x, handle=%p, tr=%02x, blend=%04x, {%d,%d,%d,%d}, {%d,%d,%d,%d}",
     61             l->compositionType, l->flags, l->handle, l->transform, l->blending,
     62             l->sourceCrop.left,
     63             l->sourceCrop.top,
     64             l->sourceCrop.right,
     65             l->sourceCrop.bottom,
     66             l->displayFrame.left,
     67             l->displayFrame.top,
     68             l->displayFrame.right,
     69             l->displayFrame.bottom);
     70 }
     71 #endif
     72 
     73 static int hwc_prepare(hwc_composer_device_1_t * /*dev*/,
     74         size_t /*numDisplays*/, hwc_display_contents_1_t** displays) {
     75     if (displays && (displays[0]->flags & HWC_GEOMETRY_CHANGED)) {
     76         for (size_t i=0 ; i<displays[0]->numHwLayers ; i++) {
     77             //dump_layer(&list->hwLayers[i]);
     78             displays[0]->hwLayers[i].compositionType = HWC_FRAMEBUFFER;
     79         }
     80     }
     81     return 0;
     82 }
     83 
     84 static int hwc_set(hwc_composer_device_1_t * /*dev*/,
     85         size_t /*numDisplays*/, hwc_display_contents_1_t** displays)
     86 {
     87     //for (size_t i=0 ; i<list->numHwLayers ; i++) {
     88     //    dump_layer(&list->hwLayers[i]);
     89     //}
     90 
     91     EGLBoolean success = eglSwapBuffers((EGLDisplay)displays[0]->dpy,
     92             (EGLSurface)displays[0]->sur);
     93     if (!success) {
     94         return HWC_EGL_ERROR;
     95     }
     96     return 0;
     97 }
     98 
     99 static int hwc_device_close(struct hw_device_t *dev)
    100 {
    101     struct hwc_context_t* ctx = (struct hwc_context_t*)dev;
    102     if (ctx) {
    103         free(ctx);
    104     }
    105     return 0;
    106 }
    107 
    108 /*****************************************************************************/
    109 
    110 static int hwc_device_open(const struct hw_module_t* module, const char* name,
    111         struct hw_device_t** device)
    112 {
    113     int status = -EINVAL;
    114     if (!strcmp(name, HWC_HARDWARE_COMPOSER)) {
    115         struct hwc_context_t *dev;
    116         dev = (hwc_context_t*)malloc(sizeof(*dev));
    117 
    118         /* initialize our state here */
    119         memset(dev, 0, sizeof(*dev));
    120 
    121         /* initialize the procs */
    122         dev->device.common.tag = HARDWARE_DEVICE_TAG;
    123         dev->device.common.version = HWC_DEVICE_API_VERSION_1_0;
    124         dev->device.common.module = const_cast<hw_module_t*>(module);
    125         dev->device.common.close = hwc_device_close;
    126 
    127         dev->device.prepare = hwc_prepare;
    128         dev->device.set = hwc_set;
    129 
    130         *device = &dev->device.common;
    131         status = 0;
    132     }
    133     return status;
    134 }
    135