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M4.68: BMP export at 1 to 32 bits, Windows or OS/2, with RLE and flipped rows

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document.export {format: "bmp"} writes BMP through the raster export path:
depth 1 (black and white), 4 or 8 (a palette by reduction and dither,
optionally RLE4/RLE8), 16 (5-5-5), 24 or 32 (with alpha, a version 4
header); colorModel rgb or gray; fileFormat windows or os2 (a core header);
flipRows writes top-down rows (a negative height). Impossible combinations
are refused as bad params. Export As offers it with the bmpOptions dialog,
which keeps its choices writable together; BMP moves from read-only to read
and write (tests that used .bmp as the unwritable format now use .dwg).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-05 15:24:35 +07:00
co-authored by Claude Opus 5.5
parent d01b2fbd8a
commit f2fc8782c7
19 changed files with 668 additions and 44 deletions
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crates/render/src/encode/mod.rs
+11 -3
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@@ -1,9 +1,10 @@
//! Raster export: render a document region with [`RasterExportOptions`] (resolution, background,
//! anti-aliasing) and encode it as PNG ([`png`]: resolution in `pHYs`, Adam7 interlacing), JPEG
//! ([`jpeg`]: RGB, CMYK or grey, progressive, resolution and colour profile), lossless WebP, or
//! a palette image ([`quantize`]) as PNG-8 or [`gif`], or [`tiff`] (RGB, CMYK or grey, LZW, either
//! byte order, the profile).
//! a palette image ([`quantize`]) as PNG-8 or [`gif`], [`tiff`] (RGB, CMYK or grey, LZW, either byte
//! order, the profile), [`bmp`] (1–32 bits, RLE) or [`tga`].
pub mod bmp;
pub mod gif;
pub mod jpeg;
pub mod png;
@@ -25,6 +26,7 @@ pub enum RasterFormat {
Png8,
Gif,
Tiff,
Bmp,
}
/// How a raster export renders and encodes.
@@ -41,10 +43,12 @@ pub struct RasterExportOptions {
pub quality: u8,
/// JPEG colour model, coding and profile.
pub jpeg: jpeg::JpegOptions,
/// PNG-8 and GIF: the colour reduction.
/// PNG-8 and GIF: the colour reduction (also BMP's at 1, 4 and 8 bits).
pub palette: quantize::PaletteOptions,
/// TIFF colour model, compression, byte order and profile.
pub tiff: tiff::TiffOptions,
/// BMP layout, depth, compression and row order.
pub bmp: bmp::BmpOptions,
}
impl Default for RasterExportOptions {
@@ -58,6 +62,7 @@ impl Default for RasterExportOptions {
jpeg: jpeg::JpegOptions::default(),
palette: quantize::PaletteOptions::default(),
tiff: tiff::TiffOptions::default(),
bmp: bmp::BmpOptions::default(),
}
}
}
@@ -103,6 +108,7 @@ impl RasterExportOptions {
}
}
RasterFormat::Tiff => tiff::encode(img, self.ppi, &self.tiff),
RasterFormat::Bmp => bmp::encode(&img.to_straight(), img.width, img.height, self.ppi, &self.bmp, &self.palette),
}
}
@@ -179,6 +185,8 @@ fn drawn_bounds(n: &Node) -> Option<Rect> {
#[cfg(test)]
mod tests;
#[cfg(test)]
mod tests_bmp;
#[cfg(test)]
mod tests_jpeg;
#[cfg(test)]
mod tests_palette;