feat(android): add native bitmap utils

wrappers/android/mynteye/libmynteye/src/main/cpp/mynteye/impl/frame_impl.hpp

@@ -39,6 +39,10 @@ class FrameImpl : public Frame {
     return std::vector<uint8_t>(frame_->data(), frame_->data() + frame_->size());
   }
 
+  frame_t RawFrame() const {
+    return frame_;
+  }
+
  private:
   frame_t frame_;
 };

wrappers/android/mynteye/libmynteye/src/main/cpp/mynteye/impl/util/jni_util.cpp

@@ -0,0 +1,117 @@
+#include <android/bitmap.h>
+#include <android/log.h>
+#include <jni.h>
+
+#ifndef LOG_TAG
+#define LOG_TAG "native"
+#endif
+
+#define LOGI(...) \
+  ((void)__android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__))
+#define LOGW(...) \
+  ((void)__android_log_print(ANDROID_LOG_WARN, LOG_TAG, __VA_ARGS__))
+#define LOGE(...) \
+  ((void)__android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__))
+
+#include "NativeFrame.hpp"
+
+#include "frame_impl.hpp"
+
+// BitmapUtils
+
+// RGBA
+typedef struct {
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+  uint8_t a;
+} rgba_t;
+
+void copyPixelsGray(std::uint8_t *from, rgba_t *to, uint32_t n);
+void copyPixelsBGR3(std::uint8_t *from, rgba_t *to, uint32_t n);
+void copyPixelsRGB3(std::uint8_t *from, rgba_t *to, uint32_t n);
+
+void copyPixels(mynteye_jni::FrameImpl::frame_t from, rgba_t *to,
+    const AndroidBitmapInfo &info) {
+  if (info.width != from->width() || info.height != from->height()) {
+    LOGE("Frame size is not same");
+    return;
+  }
+  uint32_t n = info.width * info.height;
+  switch (from->format()) {
+    case MYNTEYE_NAMESPACE::Format::GREY:
+      copyPixelsGray(from->data(), to, n);
+      return;
+    case MYNTEYE_NAMESPACE::Format::BGR888:
+      copyPixelsBGR3(from->data(), to, n);
+      return;
+    case MYNTEYE_NAMESPACE::Format::RGB888:
+      copyPixelsRGB3(from->data(), to, n);
+      return;
+    case MYNTEYE_NAMESPACE::Format::YUYV:
+    default:
+      LOGE("Frame format is not supported");
+      return;
+  }
+}
+
+CJNIEXPORT void JNICALL Java_com_slightech_mynteye_util_BitmapUtils_copyPixels(
+    JNIEnv *env, jclass clazz, jobject j_frame, jobject bitmap) {
+  auto frame = ::djinni_generated::NativeFrame::toCpp(env, j_frame);
+  // LOGI("frame format: %dx%d", frame->Width(), frame->Height());
+  auto frame_raw = std::dynamic_pointer_cast<mynteye_jni::FrameImpl>(frame)->RawFrame();
+
+  AndroidBitmapInfo info;
+  int result;
+  if ((result = AndroidBitmap_getInfo(env, bitmap, &info)) < 0) {
+    LOGE("AndroidBitmap_getInfo() failed, error=%d", result);
+    return;
+  }
+  if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
+    LOGE("Bitmap format is not RGBA_8888!");
+    return;
+  }
+
+  void *pixels;
+  if ((result = AndroidBitmap_lockPixels(env, bitmap, &pixels)) < 0) {
+    LOGE("AndroidBitmap_lockPixels() failed, error=%d", result);
+  }
+  rgba_t *rgba_pixels = static_cast<rgba_t*>(pixels);
+
+  copyPixels(frame_raw, rgba_pixels, info);
+
+  AndroidBitmap_unlockPixels(env, bitmap);
+}
+
+void copyPixelsGray(std::uint8_t *from, rgba_t *to, uint32_t n) {
+  for (uint32_t i = 0; i < n; ++i) {
+    std::uint8_t &gray = from[i];
+    rgba_t &rgba = to[i];
+    rgba.r = gray;
+    rgba.g = gray;
+    rgba.b = gray;
+    rgba.a = 255;
+  }
+}
+
+void copyPixelsBGR3(std::uint8_t *from, rgba_t *to, uint32_t n) {
+  for (uint32_t i = 0; i < n; ++i) {
+    std::uint8_t *bgr = from + (i*3);
+    rgba_t &rgba = to[i];
+    rgba.r = *(bgr + 2);
+    rgba.g = *(bgr + 1);
+    rgba.b = *(bgr);
+    rgba.a = 255;
+  }
+}
+
+void copyPixelsRGB3(std::uint8_t *from, rgba_t *to, uint32_t n) {
+  for (uint32_t i = 0; i < n; ++i) {
+    std::uint8_t *rgb = from + (i*3);
+    rgba_t &rgba = to[i];
+    rgba.r = *(rgb);
+    rgba.g = *(rgb + 1);
+    rgba.b = *(rgb + 2);
+    rgba.a = 255;
+  }
+}

wrappers/android/mynteye/libmynteye/src/main/java/com/slightech/mynteye/util/BitmapUtils.java

@@ -0,0 +1,10 @@
+package com.slightech.mynteye.util;
+
+import android.graphics.Bitmap;
+import com.slightech.mynteye.Frame;
+
+public class BitmapUtils {
+
+  public static native void copyPixels(Frame from, Bitmap to);
+
+}