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      1 /*
      2  * Copyright (C) 2009 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 <android/bitmap.h>
     18 #include <GraphicsJNI.h>
     19 
     20 int AndroidBitmap_getInfo(JNIEnv* env, jobject jbitmap,
     21                           AndroidBitmapInfo* info) {
     22     if (NULL == env || NULL == jbitmap) {
     23         return ANDROID_BITMAP_RESULT_BAD_PARAMETER;
     24     }
     25 
     26     SkBitmap* bm = GraphicsJNI::getNativeBitmap(env, jbitmap);
     27     if (NULL == bm) {
     28         return ANDROID_BITMAP_RESULT_JNI_EXCEPTION;
     29     }
     30 
     31     if (info) {
     32         info->width     = bm->width();
     33         info->height    = bm->height();
     34         info->stride    = bm->rowBytes();
     35         info->flags     = 0;
     36 
     37         switch (bm->colorType()) {
     38             case kN32_SkColorType:
     39                 info->format = ANDROID_BITMAP_FORMAT_RGBA_8888;
     40                 break;
     41             case kRGB_565_SkColorType:
     42                 info->format = ANDROID_BITMAP_FORMAT_RGB_565;
     43                 break;
     44             case kARGB_4444_SkColorType:
     45                 info->format = ANDROID_BITMAP_FORMAT_RGBA_4444;
     46                 break;
     47             case kAlpha_8_SkColorType:
     48                 info->format = ANDROID_BITMAP_FORMAT_A_8;
     49                 break;
     50             default:
     51                 info->format = ANDROID_BITMAP_FORMAT_NONE;
     52                 break;
     53         }
     54     }
     55     return ANDROID_BITMAP_RESULT_SUCCESS;
     56 }
     57 
     58 int AndroidBitmap_lockPixels(JNIEnv* env, jobject jbitmap, void** addrPtr) {
     59     if (NULL == env || NULL == jbitmap) {
     60         return ANDROID_BITMAP_RESULT_BAD_PARAMETER;
     61     }
     62 
     63     SkBitmap* bm = GraphicsJNI::getNativeBitmap(env, jbitmap);
     64     if (NULL == bm) {
     65         return ANDROID_BITMAP_RESULT_JNI_EXCEPTION;
     66     }
     67 
     68     bm->lockPixels();
     69     void* addr = bm->getPixels();
     70     if (NULL == addr) {
     71         bm->unlockPixels();
     72         return ANDROID_BITMAP_RESULT_ALLOCATION_FAILED;
     73     }
     74 
     75     if (addrPtr) {
     76         *addrPtr = addr;
     77     }
     78     return ANDROID_BITMAP_RESULT_SUCCESS;
     79 }
     80 
     81 int AndroidBitmap_unlockPixels(JNIEnv* env, jobject jbitmap) {
     82     if (NULL == env || NULL == jbitmap) {
     83         return ANDROID_BITMAP_RESULT_BAD_PARAMETER;
     84     }
     85 
     86     SkBitmap* bm = GraphicsJNI::getNativeBitmap(env, jbitmap);
     87     if (NULL == bm) {
     88         return ANDROID_BITMAP_RESULT_JNI_EXCEPTION;
     89     }
     90 
     91     // notifyPixelsChanged() needs be called to apply writes to GL-backed
     92     // bitmaps.  Note that this will slow down read-only accesses to the
     93     // bitmaps, but the NDK methods are primarily intended to be used for
     94     // writes.
     95     bm->notifyPixelsChanged();
     96 
     97     bm->unlockPixels();
     98     return ANDROID_BITMAP_RESULT_SUCCESS;
     99 }
    100 
    101