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swrenderer: Fix drawing of tiled svg

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This fixes drawing the background of the live preview with the software
renderer.

The problem was that when a svg image is tiled (and the svg is not
pre-rendered), we would render the svg in a duffer the size of the
target. But that's not the size at which it should be rendered as it is
going to be tiled over this surface.

Too big images are not supported by the software renderer, it would
panic in overflows in diverse places. So this also fixes panics
This commit is contained in:
Olivier Goffart 2024-12-05 16:45:35 +01:00
parent eab8952729
commit ff8aff6ab4
1 changed files with 8 additions and 2 deletions
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10
internal/core/software_renderer.rs
View file

@ -1368,9 +1368,15 @@ impl<'a, T: ProcessScene> SceneBuilder<'a, T> {
let Some(clipped_target) = physical_clip.intersection(&target_rect) else {
return;
};
if let Some(buffer) = image_inner.render_to_buffer(Some(target_rect.size.cast())) {
let orig = image_inner.size().cast::<f32>();
let svg_target_size = if tiled.is_some() {
euclid::size2(orig.width * source_to_target_x, orig.height * source_to_target_y)
.cast()
} else {
target_rect.size.cast()
};
if let Some(buffer) = image_inner.render_to_buffer(Some(svg_target_size)) {
let buf_size = buffer.size().cast::<f32>();
let orig = image_inner.size().cast::<f32>();
let dx =
Fixed::from_f32(buf_size.width / orig.width / source_to_target_x).unwrap();
let dy = Fixed::from_f32(buf_size.height / orig.height / source_to_target_y)