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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 <android_runtime/AndroidRuntime.h>
     24 #include <utils/misc.h>
     25 
     26 // ----------------------------------------------------------------------------
     27 
     28 namespace android {
     29 
     30 // ----------------------------------------------------------------------------
     31 
     32 struct offsets_t {
     33     jfieldID bytesPerPixel;
     34     jfieldID bitsPerPixel;
     35 };
     36 
     37 static offsets_t offsets;
     38 
     39 static void doThrow(JNIEnv* env, const char* exc, const char* msg = NULL)
     40 {
     41     jclass npeClazz = env->FindClass(exc);
     42     env->ThrowNew(npeClazz, msg);
     43 }
     44 
     45 // ----------------------------------------------------------------------------
     46 
     47 static void android_graphics_getPixelFormatInfo(
     48         JNIEnv* env, jobject clazz, jint format, jobject pixelFormatObject)
     49 {
     50     PixelFormatInfo info;
     51     status_t err;
     52 
     53     // we need this for backward compatibility with PixelFormat's
     54     // deprecated constants
     55     switch (format) {
     56     case HAL_PIXEL_FORMAT_YCbCr_422_SP:
     57         // defined as the bytes per pixel of the Y plane
     58         info.bytesPerPixel = 1;
     59         info.bitsPerPixel = 16;
     60         goto done;
     61     case HAL_PIXEL_FORMAT_YCrCb_420_SP:
     62         // defined as the bytes per pixel of the Y plane
     63         info.bytesPerPixel = 1;
     64         info.bitsPerPixel = 12;
     65         goto done;
     66     case HAL_PIXEL_FORMAT_YCbCr_422_I:
     67         // defined as the bytes per pixel of the Y plane
     68         info.bytesPerPixel = 1;
     69         info.bitsPerPixel = 16;
     70         goto done;
     71     }
     72 
     73     err = getPixelFormatInfo(format, &info);
     74     if (err < 0) {
     75         doThrow(env, "java/lang/IllegalArgumentException");
     76         return;
     77     }
     78 
     79 done:
     80     env->SetIntField(pixelFormatObject, offsets.bytesPerPixel, info.bytesPerPixel);
     81     env->SetIntField(pixelFormatObject, offsets.bitsPerPixel,  info.bitsPerPixel);
     82 }
     83 // ----------------------------------------------------------------------------
     84 
     85 const char* const kClassPathName = "android/graphics/PixelFormat";
     86 
     87 static void nativeClassInit(JNIEnv* env, jclass clazz);
     88 
     89 static JNINativeMethod gMethods[] = {
     90     {   "nativeClassInit", "()V",
     91         (void*)nativeClassInit },
     92 	{   "getPixelFormatInfo", "(ILandroid/graphics/PixelFormat;)V",
     93         (void*)android_graphics_getPixelFormatInfo
     94     }
     95 };
     96 
     97 void nativeClassInit(JNIEnv* env, jclass clazz)
     98 {
     99     offsets.bytesPerPixel = env->GetFieldID(clazz, "bytesPerPixel", "I");
    100     offsets.bitsPerPixel  = env->GetFieldID(clazz, "bitsPerPixel", "I");
    101 }
    102 
    103 int register_android_graphics_PixelFormat(JNIEnv* env)
    104 {
    105     return AndroidRuntime::registerNativeMethods(env,
    106             kClassPathName, gMethods, NELEM(gMethods));
    107 }
    108 
    109 };
    110