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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/thumbnail/generator/android/thumbnail_generator.h"
#include <memory>
#include "base/android/jni_string.h"
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
#include "base/threading/thread_restrictions.h"
#include "chrome/browser/thumbnail/generator/android/thumbnail_media_parser.h"
#include "chrome/browser/thumbnail/generator/thumbnail_util.h"
#include "content/public/browser/browser_thread.h"
#include "ui/gfx/android/java_bitmap.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "chrome/browser/thumbnail/generator/jni_headers/ThumbnailGenerator_jni.h"
class SkBitmap;
using base::android::JavaParamRef;
using base::android::ScopedJavaGlobalRef;
namespace {
void ForwardJavaCallback(const ScopedJavaGlobalRef<jobject>& java_delegate,
const ScopedJavaGlobalRef<jstring>& content_id,
int icon_size,
const ScopedJavaGlobalRef<jobject>& callback,
SkBitmap thumbnail) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
JNIEnv* env = base::android::AttachCurrentThread();
Java_ThumbnailGenerator_onThumbnailRetrieved(
env, java_delegate, content_id, icon_size,
thumbnail.drawsNothing() ? nullptr : gfx::ConvertToJavaBitmap(thumbnail),
callback);
}
void OnThumbnailScaled(base::OnceCallback<void(SkBitmap)> java_callback,
SkBitmap scaled_thumbnail) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
std::move(java_callback).Run(std::move(scaled_thumbnail));
}
} // namespace
ThumbnailGenerator::ThumbnailGenerator(const JavaParamRef<jobject>& jobj)
: java_delegate_(jobj) {
DCHECK(!jobj.is_null());
}
ThumbnailGenerator::~ThumbnailGenerator() = default;
void ThumbnailGenerator::Destroy(JNIEnv* env,
const JavaParamRef<jobject>& jobj) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
delete this;
}
void ThumbnailGenerator::OnImageThumbnailRetrieved(
base::OnceCallback<void(SkBitmap)> java_callback,
const SkBitmap& thumbnail) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Send the bitmap back to Java-land.
std::move(java_callback).Run(std::move(thumbnail));
}
void ThumbnailGenerator::OnVideoThumbnailRetrieved(
base::OnceCallback<void(SkBitmap)> java_callback,
int icon_size,
std::unique_ptr<ThumbnailMediaParser> parser,
bool success,
chrome::mojom::MediaMetadataPtr media_metadata,
SkBitmap thumbnail) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Scale the bitmap before sending back to Java.
ScaleDownBitmap(icon_size, std::move(thumbnail),
base::BindOnce(&OnThumbnailScaled, std::move(java_callback)));
// We want to delete |parser| but can't do it immediately because current
// stack contains functions that belong to ThumbnailMediaParser and the
// VideoDecoder that the parser owens. This would cause use-after-free.
// That's why |parser|'s destruction is postponed till the current task
// is completed and the call stack doesn't have frames referencing memory
// owned by |parser|
base::SequencedTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE,
std::move(parser));
}
void ThumbnailGenerator::RetrieveThumbnail(
JNIEnv* env,
const JavaParamRef<jobject>& jobj,
const JavaParamRef<jstring>& jcontent_id,
const JavaParamRef<jstring>& jfile_path,
const JavaParamRef<jstring>& jmime_type,
jint icon_size,
const JavaParamRef<jobject>& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
base::FilePath file_path = base::FilePath::FromUTF8Unsafe(
base::android::ConvertJavaStringToUTF8(env, jfile_path));
std::string mime_type =
jmime_type.is_null()
? ""
: base::android::ConvertJavaStringToUTF8(env, jmime_type);
// Bind everything passed back to Java.
auto java_callback =
base::BindOnce(&ForwardJavaCallback, java_delegate_,
ScopedJavaGlobalRef<jstring>(jcontent_id), icon_size,
ScopedJavaGlobalRef<jobject>(callback));
// Retrieve video thumbnail.
if (base::StartsWith(mime_type, "video/",
base::CompareCase::INSENSITIVE_ASCII)) {
auto parser = ThumbnailMediaParser::Create(mime_type, file_path);
auto* const parser_ptr = parser.get();
parser_ptr->Start(
base::BindOnce(&ThumbnailGenerator::OnVideoThumbnailRetrieved,
weak_factory_.GetWeakPtr(), std::move(java_callback),
icon_size, std::move(parser)));
return;
}
// Retrieve image thumbnail.
auto request = std::make_unique<ImageThumbnailRequest>(
icon_size,
base::BindOnce(&ThumbnailGenerator::OnImageThumbnailRetrieved,
weak_factory_.GetWeakPtr(), std::move(java_callback)));
request->Start(file_path);
// Dropping ownership of |request| here because it will clean itself up once
// the started request finishes.
request.release();
}
// static
static jlong JNI_ThumbnailGenerator_Init(JNIEnv* env,
const JavaParamRef<jobject>& jobj) {
return reinterpret_cast<intptr_t>(new ThumbnailGenerator(jobj));
}
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