tarsin
d30379251d
Skia use SKMemoryStream to read file mapping data SKMemoryStream always use memcpy to emulate posix read stream behaviour, cannot take advantages of file mapping reading * https://github.com/google/skia/blob/1f193df9b393d50da39570dab77a0bb5d28ec8ef/src/core/SkStream.cpp#L335
64 lines
2.1 KiB
Kotlin
64 lines
2.1 KiB
Kotlin
/*
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* Copyright 2022 Tarsin Norbin
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*
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* This file is part of EhViewer
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*
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* EhViewer is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* EhViewer is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with EhViewer.
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* If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.hippo
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import android.content.Context
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import android.graphics.ImageDecoder
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import android.net.Uri
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import com.hippo.image.Image
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import java.nio.ByteBuffer
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class UriArchiveAccessor(ctx: Context, uri: Uri) {
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val pfd by lazy { ctx.contentResolver.openFileDescriptor(uri, "r")!! }
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fun open(): Int {
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return openArchive(pfd.fd, pfd.statSize)
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}
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private external fun openArchive(fd: Int, size: Long): Int
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private external fun extractToByteBuffer(index: Int): ByteBuffer?
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external fun extractToFd(index: Int, fd: Int)
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external fun getFilename(index: Int): String
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external fun needPassword(): Boolean
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external fun providePassword(str: String): Boolean
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private external fun closeArchive()
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fun close() {
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closeArchive()
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pfd.close()
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}
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fun getImageSource(index: Int): Image.CloseableSource? {
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val buffer = extractToByteBuffer(index)
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buffer ?: return null
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check(buffer.isDirect)
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Image.rewriteGifSource(buffer)
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val source = ImageDecoder.createSource(buffer)
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return object : Image.CloseableSource {
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override val source: ImageDecoder.Source
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get() = source
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override fun close() {
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releaseByteBuffer(buffer)
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}
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}
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}
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companion object {
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@JvmStatic
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private external fun releaseByteBuffer(buffer: ByteBuffer)
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}
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} |