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simplify png decoding
refs: https://github.com/image-rs/image/issues/1989
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@ -11,15 +11,14 @@ use config::{AllowSquareGlyphOverflow, TextStyle};
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use euclid::num::Zero;
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use image::io::Limits;
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use image::{
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AnimationDecoder, ColorType, DynamicImage, Frame, Frames, ImageDecoder, ImageFormat,
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ImageResult,
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AnimationDecoder, DynamicImage, Frame, Frames, ImageDecoder, ImageFormat, ImageResult,
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};
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use lfucache::LfuCache;
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use once_cell::sync::Lazy;
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use ordered_float::NotNan;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::io::{Read, Seek};
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use std::io::Seek;
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use std::rc::Rc;
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use std::sync::mpsc::{sync_channel, Receiver, RecvTimeoutError, SyncSender, TryRecvError};
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use std::sync::{Arc, MutexGuard};
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@ -272,56 +271,7 @@ impl FrameDecoder {
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if decoder.is_apng() {
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decoder.apng().into_frames()
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} else {
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let size = decoder.total_bytes() as usize;
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let mut buf = vec![0u8; size];
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let (width, height) = decoder.dimensions();
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let color_type = decoder.color_type();
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let mut reader = decoder.into_reader().context("PngDecoder into_reader")?;
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reader.read(&mut buf)?;
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let buf: image::RgbaImage = match color_type {
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ColorType::Rgb8 => DynamicImage::ImageRgb8(
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image::RgbImage::from_raw(width, height, buf).ok_or_else(|| {
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anyhow::anyhow!(
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"PNG {color_type:?} {size} / {width}x{height} = {} \
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bytes per pixel",
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size / (width * height) as usize
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)
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})?,
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)
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.into_rgba8(),
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ColorType::Rgba8 => image::RgbaImage::from_raw(width, height, buf)
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.ok_or_else(|| {
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anyhow::anyhow!(
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"PNG {color_type:?} {size} / {width}x{height} = {} \
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bytes per pixel",
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size / (width * height) as usize
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)
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})?,
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ColorType::L8 => DynamicImage::ImageLuma8(
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image::ImageBuffer::<image::Luma<_>, _>::from_raw(width, height, buf)
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.ok_or_else(|| {
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anyhow::anyhow!(
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"PNG {color_type:?} {size} / {width}x{height} = {} \
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bytes per pixel",
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size / (width * height) as usize
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)
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})?,
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)
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.into_rgba8(),
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ColorType::La8 => DynamicImage::ImageLumaA8(
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image::ImageBuffer::<image::LumaA<_>, _>::from_raw(width, height, buf)
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.ok_or_else(|| {
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anyhow::anyhow!(
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"PNG {color_type:?} {size} / {width}x{height} = {} \
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bytes per pixel",
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size / (width * height) as usize
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)
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})?,
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)
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.into_rgba8(),
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_ => anyhow::bail!("unimplemented PNG conversion from {color_type:?}"),
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};
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let buf = DynamicImage::from_decoder(decoder)?.into_rgba8();
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let delay = image::Delay::from_numer_denom_ms(u32::MAX, 1);
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let frame = Frame::from_parts(buf, 0, 0, delay);
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Frames::new(Box::new(std::iter::once(ImageResult::Ok(frame))))
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