Open Source Computer Vision Library
https://opencv.org/
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81 lines
1.9 KiB
81 lines
1.9 KiB
#include <jni.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* |
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* Class: org_opencv_utils |
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* Method: nBitmapToMat(Bitmap b) |
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* Signature: (L)J |
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*/ |
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JNIEXPORT jlong JNICALL Java_org_opencv_utils_nBitmapToMat |
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(JNIEnv *, jclass, jobject); |
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/* |
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* Class: org_opencv_utils |
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* Method: nBitmapToMat(long m, Bitmap b) |
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* Signature: (JL)Z |
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*/ |
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JNIEXPORT jboolean JNICALL Java_org_opencv_utils_nMatToBitmap |
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(JNIEnv *, jclass, jlong, jobject); |
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#ifdef __cplusplus |
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} |
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#endif |
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#include "opencv2/core/core.hpp" |
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#include <android/bitmap.h> |
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JNIEXPORT jlong JNICALL Java_org_opencv_utils_nBitmapToMat |
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(JNIEnv * env, jclass cls, jobject bitmap) |
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{ |
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AndroidBitmapInfo info; |
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void* pixels; |
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cv::Mat* m = NULL; |
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if ( AndroidBitmap_getInfo(env, bitmap, &info) < 0 ) |
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return 0; // can't get info |
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if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) |
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return 0; // incompatible format |
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if ( AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0 ) |
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return 0; // can't get pixels |
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m = new cv::Mat(info.height, info.width, CV_8UC4); |
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memcpy(m->data, pixels, info.height * info.width * 4); |
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AndroidBitmap_unlockPixels(env, bitmap); |
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return (jlong)m; |
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} |
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JNIEXPORT jboolean JNICALL Java_org_opencv_utils_nMatToBitmap |
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(JNIEnv * env, jclass cls, jlong m, jobject bitmap) |
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{ |
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AndroidBitmapInfo info; |
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void* pixels; |
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cv::Mat* mat = (cv::Mat*) m; |
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if ( m == 0 ) |
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return false; // no native Mat behind |
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if ( AndroidBitmap_getInfo(env, bitmap, &info) < 0 ) |
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return false; // can't get info |
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if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) |
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return false; // incompatible format |
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if ( AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0 ) |
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return false; // can't get pixels |
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memcpy(pixels, mat->data, info.height * info.width * 4); |
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AndroidBitmap_unlockPixels(env, bitmap); |
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return true; |
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}
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