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+/* 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/. */
+
+use crate::api::TileSize;
+use crate::api::units::*;
+use crate::segment::EdgeAaSegmentMask;
+use euclid::{point2, size2};
+use std::i32;
+use std::ops::Range;
+
+/// If repetitions are far enough apart that only one is within
+/// the primitive rect, then we can simplify the parameters and
+/// treat the primitive as not repeated.
+/// This can let us avoid unnecessary work later to handle some
+/// of the parameters.
+pub fn simplify_repeated_primitive(
+ stretch_size: &LayoutSize,
+ tile_spacing: &mut LayoutSize,
+ prim_rect: &mut LayoutRect,
+) {
+ let stride = *stretch_size + *tile_spacing;
+
+ if stride.width >= prim_rect.size.width {
+ tile_spacing.width = 0.0;
+ prim_rect.size.width = f32::min(prim_rect.size.width, stretch_size.width);
+ }
+ if stride.height >= prim_rect.size.height {
+ tile_spacing.height = 0.0;
+ prim_rect.size.height = f32::min(prim_rect.size.height, stretch_size.height);
+ }
+}
+
+pub struct Repetition {
+ pub origin: LayoutPoint,
+ pub edge_flags: EdgeAaSegmentMask,
+}
+
+pub struct RepetitionIterator {
+ current_x: i32,
+ x_count: i32,
+ current_y: i32,
+ y_count: i32,
+ row_flags: EdgeAaSegmentMask,
+ current_origin: LayoutPoint,
+ initial_origin: LayoutPoint,
+ stride: LayoutSize,
+}
+
+impl Iterator for RepetitionIterator {
+ type Item = Repetition;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ if self.current_x == self.x_count {
+ self.current_y += 1;
+ if self.current_y >= self.y_count {
+ return None;
+ }
+ self.current_x = 0;
+
+ self.row_flags = EdgeAaSegmentMask::empty();
+ if self.current_y == self.y_count - 1 {
+ self.row_flags |= EdgeAaSegmentMask::BOTTOM;
+ }
+
+ self.current_origin.x = self.initial_origin.x;
+ self.current_origin.y += self.stride.height;
+ }
+
+ let mut edge_flags = self.row_flags;
+ if self.current_x == 0 {
+ edge_flags |= EdgeAaSegmentMask::LEFT;
+ }
+
+ if self.current_x == self.x_count - 1 {
+ edge_flags |= EdgeAaSegmentMask::RIGHT;
+ }
+
+ let repetition = Repetition {
+ origin: self.current_origin,
+ edge_flags,
+ };
+
+ self.current_origin.x += self.stride.width;
+ self.current_x += 1;
+
+ Some(repetition)
+ }
+}
+
+pub fn repetitions(
+ prim_rect: &LayoutRect,
+ visible_rect: &LayoutRect,
+ stride: LayoutSize,
+) -> RepetitionIterator {
+ assert!(stride.width > 0.0);
+ assert!(stride.height > 0.0);
+
+ let visible_rect = match prim_rect.intersection(&visible_rect) {
+ Some(rect) => rect,
+ None => {
+ return RepetitionIterator {
+ current_origin: LayoutPoint::zero(),
+ initial_origin: LayoutPoint::zero(),
+ current_x: 0,
+ current_y: 0,
+ x_count: 0,
+ y_count: 0,
+ stride,
+ row_flags: EdgeAaSegmentMask::empty(),
+ }
+ }
+ };
+
+ let nx = if visible_rect.origin.x > prim_rect.origin.x {
+ f32::floor((visible_rect.origin.x - prim_rect.origin.x) / stride.width)
+ } else {
+ 0.0
+ };
+
+ let ny = if visible_rect.origin.y > prim_rect.origin.y {
+ f32::floor((visible_rect.origin.y - prim_rect.origin.y) / stride.height)
+ } else {
+ 0.0
+ };
+
+ let x0 = prim_rect.origin.x + nx * stride.width;
+ let y0 = prim_rect.origin.y + ny * stride.height;
+
+ let x_most = visible_rect.max_x();
+ let y_most = visible_rect.max_y();
+
+ let x_count = f32::ceil((x_most - x0) / stride.width) as i32;
+ let y_count = f32::ceil((y_most - y0) / stride.height) as i32;
+
+ let mut row_flags = EdgeAaSegmentMask::TOP;
+ if y_count == 1 {
+ row_flags |= EdgeAaSegmentMask::BOTTOM;
+ }
+
+ RepetitionIterator {
+ current_origin: LayoutPoint::new(x0, y0),
+ initial_origin: LayoutPoint::new(x0, y0),
+ current_x: 0,
+ current_y: 0,
+ x_count,
+ y_count,
+ row_flags,
+ stride,
+ }
+}
+
+#[derive(Debug)]
+pub struct Tile {
+ pub rect: LayoutRect,
+ pub offset: TileOffset,
+ pub edge_flags: EdgeAaSegmentMask,
+}
+
+#[derive(Debug)]
+pub struct TileIteratorExtent {
+ /// Range of visible tiles to iterate over in number of tiles.
+ tile_range: Range<i32>,
+ /// Range of tiles of the full image including tiles that are culled out.
+ image_tiles: Range<i32>,
+ /// Size of the first tile in layout space.
+ first_tile_layout_size: f32,
+ /// Size of the last tile in layout space.
+ last_tile_layout_size: f32,
+ /// Position of blob point (0, 0) in layout space.
+ layout_tiling_origin: f32,
+ /// Position of the top-left corner of the primitive rect in layout space.
+ layout_prim_start: f32,
+}
+
+#[derive(Debug)]
+pub struct TileIterator {
+ current_tile: TileOffset,
+ x: TileIteratorExtent,
+ y: TileIteratorExtent,
+ regular_tile_size: LayoutSize,
+}
+
+impl Iterator for TileIterator {
+ type Item = Tile;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ // If we reach the end of a row, reset to the beginning of the next row.
+ if self.current_tile.x >= self.x.tile_range.end {
+ self.current_tile.y += 1;
+ self.current_tile.x = self.x.tile_range.start;
+ }
+
+ // Stop iterating if we reach the last tile. We may start here if there
+ // were no tiles to iterate over.
+ if self.current_tile.x >= self.x.tile_range.end || self.current_tile.y >= self.y.tile_range.end {
+ return None;
+ }
+
+ let tile_offset = self.current_tile;
+
+ let mut segment_rect = LayoutRect {
+ origin: LayoutPoint::new(
+ self.x.layout_tiling_origin + tile_offset.x as f32 * self.regular_tile_size.width,
+ self.y.layout_tiling_origin + tile_offset.y as f32 * self.regular_tile_size.height,
+ ),
+ size: self.regular_tile_size,
+ };
+
+ let mut edge_flags = EdgeAaSegmentMask::empty();
+
+ if tile_offset.x == self.x.image_tiles.start {
+ edge_flags |= EdgeAaSegmentMask::LEFT;
+ segment_rect.size.width = self.x.first_tile_layout_size;
+ segment_rect.origin.x = self.x.layout_prim_start;
+ }
+ if tile_offset.x == self.x.image_tiles.end - 1 {
+ edge_flags |= EdgeAaSegmentMask::RIGHT;
+ segment_rect.size.width = self.x.last_tile_layout_size;
+ }
+
+ if tile_offset.y == self.y.image_tiles.start {
+ segment_rect.size.height = self.y.first_tile_layout_size;
+ segment_rect.origin.y = self.y.layout_prim_start;
+ edge_flags |= EdgeAaSegmentMask::TOP;
+ }
+ if tile_offset.y == self.y.image_tiles.end - 1 {
+ segment_rect.size.height = self.y.last_tile_layout_size;
+ edge_flags |= EdgeAaSegmentMask::BOTTOM;
+ }
+
+ assert!(tile_offset.y < self.y.tile_range.end);
+ let tile = Tile {
+ rect: segment_rect,
+ offset: tile_offset,
+ edge_flags,
+ };
+
+ self.current_tile.x += 1;
+
+ Some(tile)
+ }
+}
+
+pub fn tiles(
+ prim_rect: &LayoutRect,
+ visible_rect: &LayoutRect,
+ image_rect: &DeviceIntRect,
+ device_tile_size: i32,
+) -> TileIterator {
+ // The image resource is tiled. We have to generate an image primitive
+ // for each tile.
+ // We need to do this because the image is broken up into smaller tiles in the texture
+ // cache and the image shader is not able to work with this type of sparse representation.
+
+ // The tiling logic works as follows:
+ //
+ // +-#################-+ -+
+ // | #//| | |//# | | image size
+ // | #//| | |//# | |
+ // +-#--+----+----+--#-+ | -+
+ // | #//| | |//# | | | regular tile size
+ // | #//| | |//# | | |
+ // +-#--+----+----+--#-+ | -+-+
+ // | #//|////|////|//# | | | "leftover" height
+ // | ################# | -+ ---+
+ // +----+----+----+----+
+ //
+ // In the ascii diagram above, a large image is split into tiles of almost regular size.
+ // The tiles on the edges (hatched in the diagram) can be smaller than the regular tiles
+ // and are handled separately in the code (we'll call them boundary tiles).
+ //
+ // Each generated segment corresponds to a tile in the texture cache, with the
+ // assumption that the boundary tiles are sized to fit their own irregular size in the
+ // texture cache.
+ //
+ // Because we can have very large virtual images we iterate over the visible portion of
+ // the image in layer space instead of iterating over all device tiles.
+
+ let visible_rect = match prim_rect.intersection(&visible_rect) {
+ Some(rect) => rect,
+ None => {
+ return TileIterator {
+ current_tile: TileOffset::zero(),
+ x: TileIteratorExtent {
+ tile_range: 0..0,
+ image_tiles: 0..0,
+ first_tile_layout_size: 0.0,
+ last_tile_layout_size: 0.0,
+ layout_tiling_origin: 0.0,
+ layout_prim_start: prim_rect.origin.x,
+ },
+ y: TileIteratorExtent {
+ tile_range: 0..0,
+ image_tiles: 0..0,
+ first_tile_layout_size: 0.0,
+ last_tile_layout_size: 0.0,
+ layout_tiling_origin: 0.0,
+ layout_prim_start: prim_rect.origin.y,
+ },
+ regular_tile_size: LayoutSize::zero(),
+ }
+ }
+ };
+
+ // Size of regular tiles in layout space.
+ let layout_tile_size = LayoutSize::new(
+ device_tile_size as f32 / image_rect.size.width as f32 * prim_rect.size.width,
+ device_tile_size as f32 / image_rect.size.height as f32 * prim_rect.size.height,
+ );
+
+ // The decomposition logic is exactly the same on each axis so we reduce
+ // this to a 1-dimensional problem in an attempt to make the code simpler.
+
+ let x_extent = tiles_1d(
+ layout_tile_size.width,
+ visible_rect.x_range(),
+ prim_rect.min_x(),
+ image_rect.x_range(),
+ device_tile_size,
+ );
+
+ let y_extent = tiles_1d(
+ layout_tile_size.height,
+ visible_rect.y_range(),
+ prim_rect.min_y(),
+ image_rect.y_range(),
+ device_tile_size,
+ );
+
+ TileIterator {
+ current_tile: point2(
+ x_extent.tile_range.start,
+ y_extent.tile_range.start,
+ ),
+ x: x_extent,
+ y: y_extent,
+ regular_tile_size: layout_tile_size,
+ }
+}
+
+/// Decompose tiles along an arbitrary axis.
+///
+/// This does most of the heavy lifting needed for `tiles` but in a single dimension for
+/// the sake of simplicity since the problem is independent on the x and y axes.
+fn tiles_1d(
+ layout_tile_size: f32,
+ layout_visible_range: Range<f32>,
+ layout_prim_start: f32,
+ device_image_range: Range<i32>,
+ device_tile_size: i32,
+) -> TileIteratorExtent {
+ // A few sanity checks.
+ debug_assert!(layout_tile_size > 0.0);
+ debug_assert!(layout_visible_range.end >= layout_visible_range.start);
+ debug_assert!(device_image_range.end > device_image_range.start);
+ debug_assert!(device_tile_size > 0);
+
+ // Sizes of the boundary tiles in pixels.
+ let first_tile_device_size = first_tile_size_1d(&device_image_range, device_tile_size);
+ let last_tile_device_size = last_tile_size_1d(&device_image_range, device_tile_size);
+
+ // [start..end[ Range of tiles of this row/column (in number of tiles) without
+ // taking culling into account.
+ let image_tiles = tile_range_1d(&device_image_range, device_tile_size);
+
+ // Layout offset of tile (0, 0) with respect to the top-left corner of the display item.
+ let layout_offset = device_image_range.start as f32 * layout_tile_size / device_tile_size as f32;
+ // Position in layout space of tile (0, 0).
+ let layout_tiling_origin = layout_prim_start - layout_offset;
+
+ // [start..end[ Range of the visible tiles (because of culling).
+ let visible_tiles_start = f32::floor((layout_visible_range.start - layout_tiling_origin) / layout_tile_size) as i32;
+ let visible_tiles_end = f32::ceil((layout_visible_range.end - layout_tiling_origin) / layout_tile_size) as i32;
+
+ // Combine the above two to get the tiles in the image that are visible this frame.
+ let mut tiles_start = i32::max(image_tiles.start, visible_tiles_start);
+ let tiles_end = i32::min(image_tiles.end, visible_tiles_end);
+ if tiles_start > tiles_end {
+ tiles_start = tiles_end;
+ }
+
+ // The size in layout space of the boundary tiles.
+ let first_tile_layout_size = if tiles_start == image_tiles.start {
+ first_tile_device_size as f32 * layout_tile_size / device_tile_size as f32
+ } else {
+ // boundary tile was culled out, so the new first tile is a regularly sized tile.
+ layout_tile_size
+ };
+
+ // Same here.
+ let last_tile_layout_size = if tiles_end == image_tiles.end {
+ last_tile_device_size as f32 * layout_tile_size / device_tile_size as f32
+ } else {
+ layout_tile_size
+ };
+
+ TileIteratorExtent {
+ tile_range: tiles_start..tiles_end,
+ image_tiles,
+ first_tile_layout_size,
+ last_tile_layout_size,
+ layout_tiling_origin,
+ layout_prim_start,
+ }
+}
+
+/// Compute the range of tiles (in number of tiles) that intersect the provided
+/// image range (in pixels) in an arbitrary dimension.
+///
+/// ```ignore
+///
+/// 0
+/// :
+/// #-+---+---+---+---+---+--#
+/// # | | | | | | #
+/// #-+---+---+---+---+---+--#
+/// ^ : ^
+///
+/// +------------------------+ image_range
+/// +---+ regular_tile_size
+///
+/// ```
+fn tile_range_1d(
+ image_range: &Range<i32>,
+ regular_tile_size: i32,
+) -> Range<i32> {
+ // Integer division truncates towards zero so with negative values if the first/last
+ // tile isn't a full tile we can get offset by one which we account for here.
+
+ let mut start = image_range.start / regular_tile_size;
+ if image_range.start % regular_tile_size < 0 {
+ start -= 1;
+ }
+
+ let mut end = image_range.end / regular_tile_size;
+ if image_range.end % regular_tile_size > 0 {
+ end += 1;
+ }
+
+ start..end
+}
+
+// Sizes of the first boundary tile in pixels.
+//
+// It can be smaller than the regular tile size if the image is not a multiple
+// of the regular tile size.
+fn first_tile_size_1d(
+ image_range: &Range<i32>,
+ regular_tile_size: i32,
+) -> i32 {
+ // We have to account for how the % operation behaves for negative values.
+ let image_size = image_range.end - image_range.start;
+ i32::min(
+ match image_range.start % regular_tile_size {
+ // . #------+------+ .
+ // . #//////| | .
+ 0 => regular_tile_size,
+ // (zero) -> 0 . #--+------+ .
+ // . . #//| | .
+ // %(m): ~~>
+ m if m > 0 => regular_tile_size - m,
+ // . . #--+------+ 0 <- (zero)
+ // . . #//| | .
+ // %(m): <~~
+ m => -m,
+ },
+ image_size
+ )
+}
+
+// Sizes of the last boundary tile in pixels.
+//
+// It can be smaller than the regular tile size if the image is not a multiple
+// of the regular tile size.
+fn last_tile_size_1d(
+ image_range: &Range<i32>,
+ regular_tile_size: i32,
+) -> i32 {
+ // We have to account for how the modulo operation behaves for negative values.
+ let image_size = image_range.end - image_range.start;
+ i32::min(
+ match image_range.end % regular_tile_size {
+ // +------+------# .
+ // tiles: . | |//////# .
+ 0 => regular_tile_size,
+ // . +------+--# . 0 <- (zero)
+ // . | |//# . .
+ // modulo (m): <~~
+ m if m < 0 => regular_tile_size + m,
+ // (zero) -> 0 +------+--# . .
+ // . | |//# . .
+ // modulo (m): ~~>
+ m => m,
+ },
+ image_size,
+ )
+}
+
+pub fn compute_tile_rect(
+ image_rect: &DeviceIntRect,
+ regular_tile_size: TileSize,
+ tile: TileOffset,
+) -> DeviceIntRect {
+ let regular_tile_size = regular_tile_size as i32;
+ DeviceIntRect {
+ origin: point2(
+ compute_tile_origin_1d(image_rect.x_range(), regular_tile_size, tile.x as i32),
+ compute_tile_origin_1d(image_rect.y_range(), regular_tile_size, tile.y as i32),
+ ),
+ size: size2(
+ compute_tile_size_1d(image_rect.x_range(), regular_tile_size, tile.x as i32),
+ compute_tile_size_1d(image_rect.y_range(), regular_tile_size, tile.y as i32),
+ ),
+ }
+}
+
+fn compute_tile_origin_1d(
+ img_range: Range<i32>,
+ regular_tile_size: i32,
+ tile_offset: i32,
+) -> i32 {
+ let tile_range = tile_range_1d(&img_range, regular_tile_size);
+ if tile_offset == tile_range.start {
+ img_range.start
+ } else {
+ tile_offset * regular_tile_size
+ }
+}
+
+// Compute the width and height in pixels of a tile depending on its position in the image.
+pub fn compute_tile_size(
+ image_rect: &DeviceIntRect,
+ regular_tile_size: TileSize,
+ tile: TileOffset,
+) -> DeviceIntSize {
+ let regular_tile_size = regular_tile_size as i32;
+ size2(
+ compute_tile_size_1d(image_rect.x_range(), regular_tile_size, tile.x as i32),
+ compute_tile_size_1d(image_rect.y_range(), regular_tile_size, tile.y as i32),
+ )
+}
+
+fn compute_tile_size_1d(
+ img_range: Range<i32>,
+ regular_tile_size: i32,
+ tile_offset: i32,
+) -> i32 {
+ let tile_range = tile_range_1d(&img_range, regular_tile_size);
+
+ // Most tiles are going to have base_size as width and height,
+ // except for tiles around the edges that are shrunk to fit the image data.
+ let actual_size = if tile_offset == tile_range.start {
+ first_tile_size_1d(&img_range, regular_tile_size)
+ } else if tile_offset == tile_range.end - 1 {
+ last_tile_size_1d(&img_range, regular_tile_size)
+ } else {
+ regular_tile_size
+ };
+
+ assert!(actual_size > 0);
+
+ actual_size
+}
+
+pub fn compute_tile_range(
+ visible_area: &DeviceIntRect,
+ tile_size: u16,
+) -> TileRange {
+ let tile_size = tile_size as i32;
+ let x_range = tile_range_1d(&visible_area.x_range(), tile_size);
+ let y_range = tile_range_1d(&visible_area.y_range(), tile_size);
+
+ TileRange {
+ origin: point2(x_range.start, y_range.start),
+ size: size2(x_range.end - x_range.start, y_range.end - y_range.start),
+ }
+}
+
+pub fn for_each_tile_in_range(
+ range: &TileRange,
+ mut callback: impl FnMut(TileOffset),
+) {
+ for y in range.y_range() {
+ for x in range.x_range() {
+ callback(point2(x, y));
+ }
+ }
+}
+
+pub fn compute_valid_tiles_if_bounds_change(
+ prev_rect: &DeviceIntRect,
+ new_rect: &DeviceIntRect,
+ tile_size: u16,
+) -> Option<TileRange> {
+ let intersection = match prev_rect.intersection(new_rect) {
+ Some(rect) => rect,
+ None => {
+ return Some(TileRange::zero());
+ }
+ };
+
+ let left = prev_rect.min_x() != new_rect.min_x();
+ let right = prev_rect.max_x() != new_rect.max_x();
+ let top = prev_rect.min_y() != new_rect.min_y();
+ let bottom = prev_rect.max_y() != new_rect.max_y();
+
+ if !left && !right && !top && !bottom {
+ // Bounds have not changed.
+ return None;
+ }
+
+ let tw = 1.0 / (tile_size as f32);
+ let th = 1.0 / (tile_size as f32);
+
+ let tiles = intersection
+ .cast::<f32>()
+ .scale(tw, th);
+
+ let min_x = if left { f32::ceil(tiles.min_x()) } else { f32::floor(tiles.min_x()) };
+ let min_y = if top { f32::ceil(tiles.min_y()) } else { f32::floor(tiles.min_y()) };
+ let max_x = if right { f32::floor(tiles.max_x()) } else { f32::ceil(tiles.max_x()) };
+ let max_y = if bottom { f32::floor(tiles.max_y()) } else { f32::ceil(tiles.max_y()) };
+
+ Some(TileRange {
+ origin: point2(min_x as i32, min_y as i32),
+ size: size2((max_x - min_x) as i32, (max_y - min_y) as i32),
+ })
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use std::collections::HashSet;
+ use euclid::rect;
+
+ // this checks some additional invariants
+ fn checked_for_each_tile(
+ prim_rect: &LayoutRect,
+ visible_rect: &LayoutRect,
+ device_image_rect: &DeviceIntRect,
+ device_tile_size: i32,
+ callback: &mut dyn FnMut(&LayoutRect, TileOffset, EdgeAaSegmentMask),
+ ) {
+ let mut coverage = LayoutRect::zero();
+ let mut seen_tiles = HashSet::new();
+ for tile in tiles(
+ prim_rect,
+ visible_rect,
+ device_image_rect,
+ device_tile_size,
+ ) {
+ // make sure we don't get sent duplicate tiles
+ assert!(!seen_tiles.contains(&tile.offset));
+ seen_tiles.insert(tile.offset);
+ coverage = coverage.union(&tile.rect);
+ assert!(prim_rect.contains_rect(&tile.rect));
+ callback(&tile.rect, tile.offset, tile.edge_flags);
+ }
+ assert!(prim_rect.contains_rect(&coverage));
+ assert!(coverage.contains_rect(&visible_rect.intersection(&prim_rect).unwrap_or(LayoutRect::zero())));
+ }
+
+ #[test]
+ fn basic() {
+ let mut count = 0;
+ checked_for_each_tile(&rect(0., 0., 1000., 1000.),
+ &rect(75., 75., 400., 400.),
+ &rect(0, 0, 400, 400),
+ 36,
+ &mut |_tile_rect, _tile_offset, _tile_flags| {
+ count += 1;
+ },
+ );
+ assert_eq!(count, 36);
+ }
+
+ #[test]
+ fn empty() {
+ let mut count = 0;
+ checked_for_each_tile(&rect(0., 0., 74., 74.),
+ &rect(75., 75., 400., 400.),
+ &rect(0, 0, 400, 400),
+ 36,
+ &mut |_tile_rect, _tile_offset, _tile_flags| {
+ count += 1;
+ },
+ );
+ assert_eq!(count, 0);
+ }
+
+ #[test]
+ fn test_tiles_1d() {
+ // Exactly one full tile at positive offset.
+ let result = tiles_1d(64.0, -10000.0..10000.0, 0.0, 0..64, 64);
+ assert_eq!(result.tile_range.start, 0);
+ assert_eq!(result.tile_range.end, 1);
+ assert_eq!(result.first_tile_layout_size, 64.0);
+ assert_eq!(result.last_tile_layout_size, 64.0);
+
+ // Exactly one full tile at negative offset.
+ let result = tiles_1d(64.0, -10000.0..10000.0, -64.0, -64..0, 64);
+ assert_eq!(result.tile_range.start, -1);
+ assert_eq!(result.tile_range.end, 0);
+ assert_eq!(result.first_tile_layout_size, 64.0);
+ assert_eq!(result.last_tile_layout_size, 64.0);
+
+ // Two full tiles at negative and positive offsets.
+ let result = tiles_1d(64.0, -10000.0..10000.0, -64.0, -64..64, 64);
+ assert_eq!(result.tile_range.start, -1);
+ assert_eq!(result.tile_range.end, 1);
+ assert_eq!(result.first_tile_layout_size, 64.0);
+ assert_eq!(result.last_tile_layout_size, 64.0);
+
+ // One partial tile at positive offset, non-zero origin, culled out.
+ let result = tiles_1d(64.0, -100.0..10.0, 64.0, 64..310, 64);
+ assert_eq!(result.tile_range.start, result.tile_range.end);
+
+ // Two tiles at negative and positive offsets, one of which is culled out.
+ // The remaining tile is partially culled but it should still generate a full tile.
+ let result = tiles_1d(64.0, 10.0..10000.0, -64.0, -64..64, 64);
+ assert_eq!(result.tile_range.start, 0);
+ assert_eq!(result.tile_range.end, 1);
+ assert_eq!(result.first_tile_layout_size, 64.0);
+ assert_eq!(result.last_tile_layout_size, 64.0);
+ let result = tiles_1d(64.0, -10000.0..-10.0, -64.0, -64..64, 64);
+ assert_eq!(result.tile_range.start, -1);
+ assert_eq!(result.tile_range.end, 0);
+ assert_eq!(result.first_tile_layout_size, 64.0);
+ assert_eq!(result.last_tile_layout_size, 64.0);
+
+ // Stretched tile in layout space device tile size is 64 and layout tile size is 128.
+ // So the resulting tile sizes in layout space should be multiplied by two.
+ let result = tiles_1d(128.0, -10000.0..10000.0, -64.0, -64..32, 64);
+ assert_eq!(result.tile_range.start, -1);
+ assert_eq!(result.tile_range.end, 1);
+ assert_eq!(result.first_tile_layout_size, 128.0);
+ assert_eq!(result.last_tile_layout_size, 64.0);
+
+ // Two visible tiles (the rest is culled out).
+ let result = tiles_1d(10.0, 0.0..20.0, 0.0, 0..64, 64);
+ assert_eq!(result.tile_range.start, 0);
+ assert_eq!(result.tile_range.end, 1);
+ assert_eq!(result.first_tile_layout_size, 10.0);
+ assert_eq!(result.last_tile_layout_size, 10.0);
+
+ // Two visible tiles at negative layout offsets (the rest is culled out).
+ let result = tiles_1d(10.0, -20.0..0.0, -20.0, 0..64, 64);
+ assert_eq!(result.tile_range.start, 0);
+ assert_eq!(result.tile_range.end, 1);
+ assert_eq!(result.first_tile_layout_size, 10.0);
+ assert_eq!(result.last_tile_layout_size, 10.0);
+ }
+
+ #[test]
+ fn test_tile_range_1d() {
+ assert_eq!(tile_range_1d(&(0..256), 256), 0..1);
+ assert_eq!(tile_range_1d(&(0..257), 256), 0..2);
+ assert_eq!(tile_range_1d(&(-1..257), 256), -1..2);
+ assert_eq!(tile_range_1d(&(-256..256), 256), -1..1);
+ assert_eq!(tile_range_1d(&(-20..-10), 6), -4..-1);
+ assert_eq!(tile_range_1d(&(20..100), 256), 0..1);
+ }
+
+ #[test]
+ fn test_first_last_tile_size_1d() {
+ assert_eq!(first_tile_size_1d(&(0..10), 64), 10);
+ assert_eq!(first_tile_size_1d(&(-20..0), 64), 20);
+
+ assert_eq!(last_tile_size_1d(&(0..10), 64), 10);
+ assert_eq!(last_tile_size_1d(&(-20..0), 64), 20);
+ }
+
+ #[test]
+ fn doubly_partial_tiles() {
+ // In the following tests the image is a single tile and none of the sides of the tile
+ // align with the tile grid.
+ // This can only happen when we have a single non-aligned partial tile and no regular
+ // tiles.
+ assert_eq!(first_tile_size_1d(&(300..310), 64), 10);
+ assert_eq!(first_tile_size_1d(&(-20..-10), 64), 10);
+
+ assert_eq!(last_tile_size_1d(&(300..310), 64), 10);
+ assert_eq!(last_tile_size_1d(&(-20..-10), 64), 10);
+
+
+ // One partial tile at positve offset, non-zero origin.
+ let result = tiles_1d(64.0, -10000.0..10000.0, 0.0, 300..310, 64);
+ assert_eq!(result.tile_range.start, 4);
+ assert_eq!(result.tile_range.end, 5);
+ assert_eq!(result.first_tile_layout_size, 10.0);
+ assert_eq!(result.last_tile_layout_size, 10.0);
+ }
+
+ #[test]
+ fn smaller_than_tile_size_at_origin() {
+ let r = compute_tile_rect(
+ &rect(0, 0, 80, 80),
+ 256,
+ point2(0, 0),
+ );
+
+ assert_eq!(r, rect(0, 0, 80, 80));
+ }
+
+ #[test]
+ fn smaller_than_tile_size_with_offset() {
+ let r = compute_tile_rect(
+ &rect(20, 20, 80, 80),
+ 256,
+ point2(0, 0),
+ );
+
+ assert_eq!(r, rect(20, 20, 80, 80));
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 03:26:41 +0000