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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 <stdio.h>
     18 #include <assert.h>
     19 
     20 #include <ui/PixelFormat.h>
     21 
     22 #include "jni.h"
     23 #include "JNIHelp.h"
     24 #include <android_runtime/AndroidRuntime.h>
     25 #include <utils/misc.h>
     26 
     27 // ----------------------------------------------------------------------------
     28 
     29 namespace android {
     30 
     31 // ----------------------------------------------------------------------------
     32 
     33 struct offsets_t {
     34     jfieldID bytesPerPixel;
     35     jfieldID bitsPerPixel;
     36 };
     37 
     38 static offsets_t offsets;
     39 
     40 // ----------------------------------------------------------------------------
     41 
     42 static void android_graphics_getPixelFormatInfo(
     43         JNIEnv* env, jobject clazz, jint format, jobject pixelFormatObject)
     44 {
     45     PixelFormatInfo info;
     46     status_t err;
     47 
     48     // we need this for backward compatibility with PixelFormat's
     49     // deprecated constants
     50     switch (format) {
     51     case HAL_PIXEL_FORMAT_YCbCr_422_SP:
     52         // defined as the bytes per pixel of the Y plane
     53         info.bytesPerPixel = 1;
     54         info.bitsPerPixel = 16;
     55         goto done;
     56     case HAL_PIXEL_FORMAT_YCrCb_420_SP:
     57         // defined as the bytes per pixel of the Y plane
     58         info.bytesPerPixel = 1;
     59         info.bitsPerPixel = 12;
     60         goto done;
     61     case HAL_PIXEL_FORMAT_YCbCr_422_I:
     62         // defined as the bytes per pixel of the Y plane
     63         info.bytesPerPixel = 1;
     64         info.bitsPerPixel = 16;
     65         goto done;
     66     }
     67 
     68     err = getPixelFormatInfo(format, &info);
     69     if (err < 0) {
     70         jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
     71         return;
     72     }
     73 
     74 done:
     75     env->SetIntField(pixelFormatObject, offsets.bytesPerPixel, info.bytesPerPixel);
     76     env->SetIntField(pixelFormatObject, offsets.bitsPerPixel,  info.bitsPerPixel);
     77 }
     78 // ----------------------------------------------------------------------------
     79 
     80 const char* const kClassPathName = "android/graphics/PixelFormat";
     81 
     82 static void nativeClassInit(JNIEnv* env, jclass clazz);
     83 
     84 static JNINativeMethod gMethods[] = {
     85     {   "nativeClassInit", "()V",
     86         (void*)nativeClassInit },
     87 	{   "getPixelFormatInfo", "(ILandroid/graphics/PixelFormat;)V",
     88         (void*)android_graphics_getPixelFormatInfo
     89     }
     90 };
     91 
     92 void nativeClassInit(JNIEnv* env, jclass clazz)
     93 {
     94     offsets.bytesPerPixel = env->GetFieldID(clazz, "bytesPerPixel", "I");
     95     offsets.bitsPerPixel  = env->GetFieldID(clazz, "bitsPerPixel", "I");
     96 }
     97 
     98 int register_android_graphics_PixelFormat(JNIEnv* env)
     99 {
    100     return AndroidRuntime::registerNativeMethods(env,
    101             kClassPathName, gMethods, NELEM(gMethods));
    102 }
    103 
    104 };
    105