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Add BGI Image decode support

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Fix DSC decompress
This commit is contained in:
lifegpc
2025-06-12 21:52:01 +08:00
parent 8bed66d4f1
commit 242d501af5
13 changed files with 395 additions and 14 deletions
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4
src/ext/io.rs
View File

@@ -1040,14 +1040,14 @@ impl<'a> CPeek for MemReaderRef<'a> {
fn cpeek(&self, buf: &mut [u8]) -> Result<usize> {
let len = self.data.len();
let bytes_to_read = std::cmp::min(buf.len(), len - self.pos);
buf.copy_from_slice(&self.data[self.pos..self.pos + bytes_to_read]);
buf[..bytes_to_read].copy_from_slice(&self.data[self.pos..self.pos + bytes_to_read]);
Ok(bytes_to_read)
}
fn cpeek_at(&self, offset: usize, buf: &mut [u8]) -> Result<usize> {
let len = self.data.len();
let bytes_to_read = std::cmp::min(buf.len(), len - offset);
buf.copy_from_slice(&self.data[offset..offset + bytes_to_read]);
buf[..bytes_to_read].copy_from_slice(&self.data[offset..offset + bytes_to_read]);
Ok(bytes_to_read)
}
}

22
src/ext/vec.rs
View File

@@ -4,17 +4,21 @@ pub trait VecExt<T> {
}
impl<T: Copy> VecExt<T> for Vec<T> {
fn copy_overlapped(&mut self, src: usize, dst: usize, len: usize) {
let src = src.min(self.len());
let dst = dst.min(self.len());
if src < dst {
let max_count = len.min(dst - src);
for i in 0..max_count {
self[dst + i] = self[src + i];
fn copy_overlapped(&mut self, src: usize, dst: usize, mut len: usize) {
let mut src = src.min(self.len());
let mut dst = dst.min(self.len());
if dst > src {
while len > 0 {
let preceding = (dst - src).min(len);
for i in 0..preceding {
self[dst + i] = self[src + i];
}
len -= preceding;
src += preceding;
dst += preceding;
}
} else {
let max_count = len.min(src - dst);
for i in (0..max_count).rev() {
for i in 0..len {
self[dst + i] = self[src + i];
}
}