From 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 03:47:29 +0200 Subject: Adding upstream version 115.8.0esr. Signed-off-by: Daniel Baumann --- gfx/wr/wrench/src/blob.rs | 213 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 213 insertions(+) create mode 100644 gfx/wr/wrench/src/blob.rs (limited to 'gfx/wr/wrench/src/blob.rs') diff --git a/gfx/wr/wrench/src/blob.rs b/gfx/wr/wrench/src/blob.rs new file mode 100644 index 0000000000..ba291a5b23 --- /dev/null +++ b/gfx/wr/wrench/src/blob.rs @@ -0,0 +1,213 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// A very basic BlobImageRasterizer that can only render a checkerboard pattern. + +use std::collections::HashMap; +use std::sync::Arc; +use std::sync::Mutex; +use webrender::api::*; +use webrender::api::units::{BlobDirtyRect, BlobToDeviceTranslation, TileOffset}; +use webrender::api::units::DeviceIntRect; + +// Serialize/deserialize the blob. + +pub fn serialize_blob(color: ColorU) -> Arc> { + Arc::new(vec![color.r, color.g, color.b, color.a]) +} + +fn deserialize_blob(blob: &[u8]) -> Result { + let mut iter = blob.iter(); + match (iter.next(), iter.next(), iter.next(), iter.next()) { + (Some(&r), Some(&g), Some(&b), Some(&a)) => Ok(ColorU::new(r, g, b, a)), + (Some(&a), None, None, None) => Ok(ColorU::new(a, a, a, a)), + _ => Err(()), + } +} + +// perform floor((x * a) / 255. + 0.5) see "Three wrongs make a right" for derivation +fn premul(x: u8, a: u8) -> u8 { + let t = (x as u32) * (a as u32) + 128; + ((t + (t >> 8)) >> 8) as u8 +} + +// This is the function that applies the deserialized drawing commands and generates +// actual image data. +fn render_blob( + color: ColorU, + descriptor: &BlobImageDescriptor, + tile: TileOffset, + _tile_size: TileSize, + dirty_rect: &BlobDirtyRect, +) -> BlobImageResult { + // Allocate storage for the result. Right now the resource cache expects the + // tiles to have have no stride or offset. + let buf_size = descriptor.rect.area() * + descriptor.format.bytes_per_pixel(); + let mut texels = vec![0u8; (buf_size) as usize]; + + // Generate a per-tile pattern to see it in the demo. For a real use case it would not + // make sense for the rendered content to depend on its tile. + let tile_checker = (tile.x % 2 == 0) != (tile.y % 2 == 0); + + let dirty_rect = dirty_rect.to_subrect_of(&descriptor.rect); + + // We want the dirty rect local to the tile rather than the whole image. + let tx: BlobToDeviceTranslation = (-descriptor.rect.min.to_vector()).into(); + + let rasterized_rect = tx.transform_box(&dirty_rect); + + for y in rasterized_rect.min.y .. rasterized_rect.max.y { + for x in rasterized_rect.min.x .. rasterized_rect.max.x { + // Apply the tile's offset. This is important: all drawing commands should be + // translated by this offset to give correct results with tiled blob images. + let x2 = x + descriptor.rect.min.x; + let y2 = y + descriptor.rect.min.y; + + // Render a simple checkerboard pattern + let checker = if (x2 % 20 >= 10) != (y2 % 20 >= 10) { + 1 + } else { + 0 + }; + // ..nested in the per-tile checkerboard pattern + let tc = if tile_checker { 0 } else { (1 - checker) * 40 }; + + match descriptor.format { + ImageFormat::BGRA8 => { + let a = color.a * checker + tc; + let pixel_offset = ((y * descriptor.rect.width() + x) * 4) as usize; + texels[pixel_offset ] = premul(color.b * checker + tc, a); + texels[pixel_offset + 1] = premul(color.g * checker + tc, a); + texels[pixel_offset + 2] = premul(color.r * checker + tc, a); + texels[pixel_offset + 3] = a; + } + ImageFormat::R8 => { + texels[(y * descriptor.rect.width() + x) as usize] = color.a * checker + tc; + } + _ => { + return Err(BlobImageError::Other( + format!("Unsupported image format {:?}", descriptor.format), + )); + } + } + } + } + + Ok(RasterizedBlobImage { + data: Arc::new(texels), + rasterized_rect, + }) +} + +/// See rawtest.rs. We use this to test that blob images are requested the right +/// amount of times. +pub struct BlobCallbacks { + pub request: Box, +} + +impl BlobCallbacks { + pub fn new() -> Self { + BlobCallbacks { request: Box::new(|_|()) } + } +} + +pub struct CheckerboardRenderer { + image_cmds: HashMap, + callbacks: Arc>, +} + +impl CheckerboardRenderer { + pub fn new(callbacks: Arc>) -> Self { + CheckerboardRenderer { + callbacks, + image_cmds: HashMap::new(), + } + } +} + +impl BlobImageHandler for CheckerboardRenderer { + fn create_similar(&self) -> Box { + Box::new(CheckerboardRenderer::new(Arc::clone(&self.callbacks))) + } + + fn add(&mut self, key: BlobImageKey, cmds: Arc, + _visible_rect: &DeviceIntRect, tile_size: TileSize) { + self.image_cmds + .insert(key, (deserialize_blob(&cmds[..]).unwrap(), tile_size)); + } + + fn update(&mut self, key: BlobImageKey, cmds: Arc, + _visible_rect: &DeviceIntRect, _dirty_rect: &BlobDirtyRect) { + // Here, updating is just replacing the current version of the commands with + // the new one (no incremental updates). + self.image_cmds.get_mut(&key).unwrap().0 = deserialize_blob(&cmds[..]).unwrap(); + } + + fn delete(&mut self, key: BlobImageKey) { + self.image_cmds.remove(&key); + } + + fn delete_font(&mut self, _key: FontKey) {} + + fn delete_font_instance(&mut self, _key: FontInstanceKey) {} + + fn clear_namespace(&mut self, _namespace: IdNamespace) {} + + fn prepare_resources( + &mut self, + _services: &dyn BlobImageResources, + requests: &[BlobImageParams], + ) { + if !requests.is_empty() { + (self.callbacks.lock().unwrap().request)(requests); + } + } + + fn create_blob_rasterizer(&mut self) -> Box { + Box::new(Rasterizer { image_cmds: self.image_cmds.clone() }) + } + + fn enable_multithreading(&mut self, _enable: bool) {} +} + +struct Command { + request: BlobImageRequest, + color: ColorU, + descriptor: BlobImageDescriptor, + tile: TileOffset, + tile_size: TileSize, + dirty_rect: BlobDirtyRect, +} + +struct Rasterizer { + image_cmds: HashMap, +} + +impl AsyncBlobImageRasterizer for Rasterizer { + fn rasterize( + &mut self, + requests: &[BlobImageParams], + _low_priority: bool + ) -> Vec<(BlobImageRequest, BlobImageResult)> { + let requests: Vec = requests.iter().map( + |item| { + let (color, tile_size) = self.image_cmds[&item.request.key]; + + Command { + request: item.request, + color, + tile_size, + tile: item.request.tile, + descriptor: item.descriptor, + dirty_rect: item.dirty_rect, + } + } + ).collect(); + + requests.iter().map(|cmd| { + (cmd.request, render_blob(cmd.color, &cmd.descriptor, cmd.tile, cmd.tile_size, &cmd.dirty_rect)) + }).collect() + } +} -- cgit v1.2.3