76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
#include <jni.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <linux/fb.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "TestJNI.h"
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int fbfd = -1;
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char *fbp = nullptr;
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struct fb_var_screeninfo vinfo;
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struct fb_fix_screeninfo finfo;
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JNIEXPORT void JNICALL Java_org_warp_picalculator_TestJNI_disposeDisplayBuffer(JNIEnv *env, jobject thisObj)
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{
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if (fbp != nullptr) {
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munmap(fbp, finfo.smem_len);
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fbp = nullptr;
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}
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if (fbfd != -1) {
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close(fbfd);
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fbfd = -1;
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}
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return;
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}
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JNIEXPORT jobject JNICALL Java_org_warp_picalculator_TestJNI_getDisplayBuffer(JNIEnv *env, jobject thisObj)
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{
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syslog(LOG_INFO, "[JNI NATIVE] INIT");
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fbfd = open("/dev/fb1", O_RDWR);
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if (fbfd == -1) {
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syslog(LOG_ERR, "Unable to open secondary display");
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return NULL;
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}
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if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
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syslog(LOG_ERR, "Unable to get secondary display information");
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return NULL;
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}
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if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {
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syslog(LOG_ERR, "Unable to get secondary display information");
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return NULL;
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}
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syslog(LOG_INFO, "Second display is %d x %d %dbps\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);
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fbp = (char*) mmap(0, finfo.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
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if (fbp <= 0) {
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syslog(LOG_ERR, "Unable to create mamory mapping");
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close(fbfd);
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return NULL;
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}
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char* class_name = "org/warp/picalculator/MmapByteBuffer";
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jclass clz = env->FindClass(class_name);
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if (clz == NULL) {
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printf("Error, could not find class '%s'\n", class_name);
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return NULL;
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}
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char* signature = "(IIILjava/nio/ByteBuffer;)V";
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jmethodID constructor = env->GetMethodID( clz, "<init>", signature);
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if (constructor == NULL) {
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printf("Error, could not find constructor %s %s\n", class_name, signature);
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return NULL;
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}
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syslog(LOG_INFO, "[JNI NATIVE] DONE");
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return env->NewObject(clz, constructor, fbfd, fbp, finfo.smem_len,
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env->NewDirectByteBuffer(fbp, finfo.smem_len));
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}
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