Extract with_bitmap_content

Signed-off-by: Dude so hot <djohn@fbi.gov>

app/src/main/rust/src/image/qr_code.rs

@@ -1,15 +1,14 @@
-use crate::{get_bitmap_handle, jni_throwing};
-use anyhow::{anyhow, Result};
+use crate::{jni_throwing, with_bitmap_content};
+use anyhow::{Ok, Result};
 use bardecoder::decode::Decode;
 use bardecoder::default_builder;
 use bardecoder::extract::QRExtractor;
 use bardecoder::util::qr::{QRData, QRError};
-use image::{GenericImageView, ImageBuffer, Rgba};
+use image::{GenericImageView, Rgba};
 use jni::objects::JClass;
 use jni::sys::{jboolean, jobject};
 use jni::JNIEnv;
 use jni_fn::jni_fn;
-use std::ptr::slice_from_raw_parts;
 
 #[allow(dead_code)]
 struct Nothing {}
@@ -33,15 +32,7 @@ where
 #[allow(non_snake_case)]
 #[jni_fn("com.hippo.ehviewer.image.ImageKt")]
 pub fn hasQrCode(mut env: JNIEnv, _class: JClass, object: jobject) -> jboolean {
-    let handle = get_bitmap_handle(&mut env, object);
-    jni_throwing(&mut env, |_| {
-        let bitmap_info = handle.info()?;
-        let (width, height) = (bitmap_info.width(), bitmap_info.height());
-        let ptr = handle.lock_pixels()? as *const u8;
-        let buffer = unsafe { &*slice_from_raw_parts(ptr, (width * height * 4) as usize) };
-        let image = ImageBuffer::from_raw(width, height, buffer);
-        let result = image.map(|img| detect_image_ad(&img));
-        handle.unlock_pixels()?;
-        Ok(result.ok_or(anyhow!("Internal Error!"))? as jboolean)
+    jni_throwing(&mut env, |env| {
+        with_bitmap_content(env, object, |image| Ok(detect_image_ad(image) as jboolean))
     })
 }

app/src/main/rust/src/lib.rs

@@ -1,6 +1,7 @@
 mod image;
 mod parser;
 
+use ::image::{ImageBuffer, Rgba};
 use android_logger::Config;
 use anyhow::{anyhow, ensure, Result};
 use jni::objects::JByteBuffer;
@@ -11,7 +12,7 @@ use ndk::bitmap::Bitmap;
 use serde::Serialize;
 use std::ffi::c_void;
 use std::io::Cursor;
-use std::ptr::slice_from_raw_parts_mut;
+use std::ptr::{slice_from_raw_parts, slice_from_raw_parts_mut};
 use std::str::from_utf8_unchecked;
 use tl::ParserOptions;
 use tl::{Bytes, Node, NodeHandle, Parser, VDom};
@@ -141,6 +142,23 @@ fn query_childs_first_match_attr<'a>(
     get_node_handle_attr(&iter.next()?, parser, attr)
 }
 
+fn with_bitmap_content<F, R>(env: &mut JNIEnv, bitmap: jobject, f: F) -> Result<R>
+where
+    F: FnOnce(&ImageBuffer<Rgba<u8>, &[u8]>) -> Result<R>,
+{
+    let handle = get_bitmap_handle(env, bitmap);
+    let info = handle.info()?;
+    let (width, height) = (info.width(), info.height());
+    let ptr = handle.lock_pixels()? as *const u8;
+    let buffer = unsafe { &*slice_from_raw_parts(ptr, (width * height * 4) as usize) };
+    let image = ImageBuffer::from_raw(width, height, buffer);
+    let result = image
+        .ok_or(anyhow!("Image buffer not RGBA8888!!!"))
+        .and_then(|img| f(&img));
+    handle.unlock_pixels()?;
+    result
+}
+
 fn get_bitmap_handle(env: &mut JNIEnv, bitmap: jobject) -> Bitmap {
     unsafe { Bitmap::from_jni(env.get_raw(), bitmap) }
 }