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Diffstat (limited to 'src/pdf_pane.zig')
| -rw-r--r-- | src/pdf_pane.zig | 2763 |
1 files changed, 0 insertions, 2763 deletions
diff --git a/src/pdf_pane.zig b/src/pdf_pane.zig deleted file mode 100644 index 8f163488..00000000 --- a/src/pdf_pane.zig +++ /dev/null @@ -1,2763 +0,0 @@ -//! PDF panes: MuPDF-owned document state, continuous layout, navigation, -//! search/selection/outline behavior, raster reconciliation, native placement, -//! and the direct input/render seam to the shared Pardes grid. -//! Cross-pane placement and output ownership remain in pardes.zig. -const std = @import("std"); -const pardes = @import("pardes.zig"); -const image = @import("image.zig"); -const config = @import("config.zig"); -const file_pane = @import("file_pane.zig"); -const look = @import("look.zig"); -const modal = @import("modal.zig"); -const output_pane = @import("output_pane.zig"); -const tracy = @import("tracy.zig"); -const normal_input = @import("normal_input.zig"); - -pub const enabled = @import("pardes_config").mupdf; -pub const pdf = if (enabled) @import("mupdf") else struct { - pub const PageSize = struct { width: f32, height: f32 }; - pub const Raster = struct { - width: usize = 0, - height: usize = 0, - stride: usize = 0, - len: usize = 0, - pub const Band = struct { y: usize = 0, height: usize = 0, len: usize = 0 }; - pub fn wholePage(_: @This()) Band { - return .{}; - } - pub fn band(_: @This(), _: usize, _: usize) Band { - return .{}; - } - }; -}; -pub const Point = if (enabled) pdf.Point else void; -pub const Quad = if (enabled) pdf.Quad else void; -pub const Document = if (enabled) pdf.Document else opaque {}; -pub const OutlineInternalDestination = if (enabled) pdf.OutlineInternalDestination else void; -const raster_max = 256; -const raster_spare = 4; -pub const page_gap_px: u32 = 8; -const band_grain: usize = 64; - -pub const FitMode = if (enabled) enum { width, height } else void; -pub const TintMode = if (enabled) pdf.TintMode else void; -pub const TintColors = if (enabled) pdf.TintColors else void; -pub const RenderRequest = if (enabled) pdf.RenderRequest else void; - -/// Dump records must remain recognizable as PDFs even in a build without -/// MuPDF, where Look deliberately treats them as ordinary files. -pub fn isPath(path: []const u8) bool { - return std.ascii.endsWithIgnoreCase(path, ".pdf"); -} - -test "PDF dump paths are recognized independent of MuPDF support" { - try std.testing.expect(isPath("manual.pdf")); - try std.testing.expect(isPath("MANUAL.PDF")); - try std.testing.expect(!isPath("manual.pdf.txt")); - try std.testing.expect(!isPath("pdf")); -} - -pub const RasterPolicy = struct { - dpi: u16, - max_dimension: u16, - match_viewport: bool, -}; - -/// Recover the dynamic PDF prefix written by older version-1 dumps. Fit and -/// tint intentionally start fresh on restore, so matching the newly generated -/// prefix cannot recover a custom tail; the stable PdfSections marker and the -/// exact path delimit the old prefix without parsing renderer state. -pub fn legacySavedPrefix(path: []const u8, saved_tag: []const u8) ?[]const u8 { - if (!std.mem.startsWith(u8, saved_tag, "pdf ")) return null; - const marker = " PdfSections "; - const marker_at = std.mem.indexOf(u8, saved_tag, marker) orelse return null; - const path_at = marker_at + marker.len; - if (!std.mem.startsWith(u8, saved_tag[path_at..], path)) return null; - return saved_tag[0 .. path_at + path.len]; -} - -test "legacy PDF prefix is delimited by its stable marker and exact path" { - const path = "/tmp/a document.pdf"; - const tag = "pdf 2/9 height PdfFit full PdfTint PdfSections " ++ path ++ " Keep Del"; - try std.testing.expectEqualStrings( - "pdf 2/9 height PdfFit full PdfTint PdfSections " ++ path, - legacySavedPrefix(path, tag).?, - ); -} - -pub const TintKey = if (enabled) struct { - mode: TintMode, - colors: pdf.TintColors, - - pub fn eql(a: @This(), b: @This()) bool { - return a.mode == b.mode and - (a.mode == .disabled or std.meta.eql(a.colors, b.colors)); - } -} else void; - -pub const Highlight = if (enabled) pdf.Highlight else void; -pub const Highlights = if (enabled) struct { - items: []const Highlight, - /// Hover items occupy [0..active_start); search/selection follow them. - active_start: usize, - hover_page: ?usize, - - pub fn forPage(highlights: @This(), page: usize, active_page: usize) []const Highlight { - const hover = highlights.items[0..highlights.active_start]; - if (page == active_page) - return if (highlights.hover_page == page) - highlights.items - else - highlights.items[highlights.active_start..]; - return if (highlights.hover_page == page) hover else &.{}; - } -} else void; - -pub const HighlightInput = if (enabled) struct { - hover_quads: []const Quad = &.{}, - hover_page: ?usize = null, - hover_color: [3]u8, - selection_color: [3]u8, -} else void; - -pub fn buildHighlights( - state: *const State, - arena: std.mem.Allocator, - input: HighlightInput, -) !Highlights { - if (comptime !enabled) return; - const search_len = if (state.search_results) |results| results.quads.len else 0; - const selection_len = if (state.selection) |selection| selection.quads.len else 0; - const active_start = input.hover_quads.len; - const highlights = try arena.alloc(Highlight, active_start + search_len + selection_len); - var n: usize = 0; - for (input.hover_quads) |quad| { - highlights[n] = pdf.Highlight.init( - quad, - .{ input.hover_color[0], input.hover_color[1], input.hover_color[2], 0x2c }, - .custom, - ); - n += 1; - } - if (state.search_results) |results| { - for (results.quads) |item| { - highlights[n] = pdf.Highlight.init( - item.quad, - .{ 0xff, 0xd5, 0x4f, 0x70 }, - .search, - ); - n += 1; - } - } - if (state.selection) |selection| { - for (selection.quads) |quad| { - highlights[n] = pdf.Highlight.init( - quad, - .{ input.selection_color[0], input.selection_color[1], input.selection_color[2], 0x78 }, - .selection, - ); - n += 1; - } - } - return .{ .items = highlights, .active_start = active_start, .hover_page = input.hover_page }; -} - -pub const Raster = if (enabled) struct { - valid: bool = false, - page: usize = 0, - rgba: []u8 = &.{}, - /// Full page shape; rgba contains only the band below. - iw: usize = 0, - ih: usize = 0, - band_y: usize = 0, - band_h: usize = 0, - request: pdf.RenderRequest = .{}, - request_valid: bool = false, - tried: bool = false, - decorated: bool = false, - tint_key: ?TintKey = null, - revision: u32 = 0, -} else void; - -pub const SectionsOutput = if (enabled) struct { - pane: usize, - serial: u32, - revision: u32, -} else void; - -pub const SelectionUpdate = enum { failed, stationary, unchanged, changed }; - -/// Plain owned state for one PDF pane. Document navigation, search, selection, -/// layout and raster behavior live beside it; Pardes retains only cross-pane -/// focus/dispatch, cell rectangles and surface attachment. -pub const State = if (enabled) struct { - path: []u8, - document: Document, - page: usize = 0, - page_count: usize, - page_sizes: []pdf.PageSize, - page_starts: []u64, - page_heights: []u32, - document_height: u64 = 0, - layout_viewport_w: u32 = 0, - layout_viewport_h: u32 = 0, - layout_fit: FitMode = .width, - layout_valid: bool = false, - document_scroll_y: f64 = 0, - scroll_to_page_pending: bool = true, - rasters: [raster_max]Raster = undefined, - rasters_len: usize = 0, - spare: [raster_spare][]u8 = @splat(&.{}), - spare_len: usize = 0, - layout_anchor_pending: bool = false, - layout_anchor_page: usize = 0, - layout_anchor_fraction: f64 = 0, - next_raster_revision: u32 = 0, - scroll_travel: f64 = 0, - fit: FitMode = .width, - tint: TintMode = .filtered, - pan_x: u16 = 0, - pan_y: u16 = 0, - highlights_dirty: bool = false, - search_reveal_pending: bool = false, - search_results: ?pdf.SearchResults = null, - selection: ?pdf.Selection = null, - selection_text: []u8 = &.{}, - selection_anchor: ?Point = null, - selection_head: ?Point = null, - drag_anchor: ?Point = null, - drag_head: ?Point = null, - text: []u8 = &.{}, - text_tried: bool = false, - text_scroll: usize = 0, - text_scroll_clamp_pending: bool = false, - search_query: []u8 = &.{}, - search_hit: usize = 0, - reveal_viewport_w: u32 = 0, - reveal_viewport_h: u32 = 0, - reveal_fit: FitMode = .width, - reveal_viewport_valid: bool = false, - outline: ?pdf.Outline = null, - outline_tried: bool = false, - sections_output: ?SectionsOutput = null, - outline_reveal_pending: ?pdf.OutlineInternalDestination = null, - - pub fn open(gpa: std.mem.Allocator, path: []const u8, page_one_based: usize) !@This() { - var document = try Document.open(path); - errdefer document.deinit(); - const page_sizes = try gpa.alloc(pdf.PageSize, document.pages); - errdefer gpa.free(page_sizes); - for (page_sizes, 0..) |*size, page| size.* = try document.pageSize(page); - const page_starts = try gpa.alloc(u64, document.pages); - errdefer gpa.free(page_starts); - const page_heights = try gpa.alloc(u32, document.pages); - errdefer gpa.free(page_heights); - const owned_path = try gpa.dupe(u8, path); - errdefer gpa.free(owned_path); - return .{ - .path = owned_path, - .document = document, - .page = if (page_one_based > 0) - @min(page_one_based - 1, document.pages - 1) - else - 0, - .page_count = document.pages, - .page_sizes = page_sizes, - .page_starts = page_starts, - .page_heights = page_heights, - }; - } - - /// Reopen the file behind this pane without exposing a half-reloaded - /// document. MuPDF owns document-derived objects (pages, text, outlines, - /// selections and rendered pixels), so a live reload replaces the whole - /// State and carries over only user-facing view/configuration data. - pub fn reload(state: *@This(), gpa: std.mem.Allocator) !void { - const preserve_anchor = !state.scroll_to_page_pending and - (state.layout_anchor_pending or - (state.layout_valid and state.page_count > 0 and state.document_height > 0)); - var anchor_page: usize = state.layout_anchor_page; - var anchor_fraction: f64 = state.layout_anchor_fraction; - if (preserve_anchor and !state.layout_anchor_pending) { - anchor_page = pageAtOffset(state, state.document_scroll_y); - const start: f64 = @floatFromInt(state.page_starts[anchor_page]); - const height: f64 = @floatFromInt(@max(@as(u32, 1), state.page_heights[anchor_page])); - anchor_fraction = std.math.clamp( - (state.document_scroll_y - start) / height, - 0, - 1, - ); - } - - var fresh = try @This().open(gpa, state.path, state.page + 1); - errdefer fresh.deinit(gpa); - if (state.search_query.len > 0) - fresh.search_query = try gpa.dupe(u8, state.search_query); - - fresh.fit = state.fit; - fresh.tint = state.tint; - fresh.pan_x = state.pan_x; - fresh.pan_y = state.pan_y; - fresh.text_scroll = state.text_scroll; - fresh.text_scroll_clamp_pending = true; - fresh.search_hit = state.search_hit; - fresh.highlights_dirty = fresh.search_query.len > 0; - fresh.search_reveal_pending = state.search_reveal_pending; - // A retained query is still active, but a reload is not a new request - // to center its hit. Preserve the viewport observation so only a real - // viewport/fit change re-arms revealSearch on the next frame. - fresh.reveal_viewport_w = state.reveal_viewport_w; - fresh.reveal_viewport_h = state.reveal_viewport_h; - fresh.reveal_fit = state.reveal_fit; - fresh.reveal_viewport_valid = state.reveal_viewport_valid; - // Revisions are part of the backend texture key. Resetting this counter - // while the pane serial stays live can alias a cached pre-reload page. - fresh.next_raster_revision = state.next_raster_revision; - fresh.sections_output = state.sections_output; - if (preserve_anchor) { - fresh.scroll_to_page_pending = false; - fresh.layout_anchor_pending = true; - fresh.layout_anchor_page = anchor_page; - fresh.layout_anchor_fraction = anchor_fraction; - } - - var old = state.*; - state.* = fresh; - old.deinit(gpa); - } - - pub fn invalidateRaster(state: *@This(), page: usize) void { - if (rasterForPage(state, page)) |raster| raster.tried = false; - } - - pub fn invalidateAllRasters(state: *@This()) void { - for (state.rasters[0..state.rasters_len]) |*raster| { - if (raster.valid) raster.tried = false; - } - } - - fn retireRgba(state: *@This(), gpa: std.mem.Allocator, rgba: []u8) void { - if (rgba.len == 0) return; - if (state.spare_len == state.spare.len) return gpa.free(rgba); - state.spare[state.spare_len] = rgba; - state.spare_len += 1; - } - - fn retireRaster(state: *@This(), gpa: std.mem.Allocator, raster: *Raster) void { - state.retireRgba(gpa, raster.rgba); - raster.* = .{}; - } - - fn claimRgba(state: *@This(), gpa: std.mem.Allocator, bytes: usize) ?[]u8 { - for (state.spare[0..state.spare_len], 0..) |candidate, index| { - if (candidate.len != bytes) continue; - state.spare_len -= 1; - state.spare[index] = state.spare[state.spare_len]; - return candidate; - } - return gpa.alloc(u8, bytes) catch null; - } - - fn trimSpares(state: *@This(), gpa: std.mem.Allocator) void { - while (state.spare_len > 1) { - state.spare_len -= 1; - gpa.free(state.spare[state.spare_len]); - } - } - - fn dropSearchResults(state: *@This(), gpa: std.mem.Allocator) void { - if (state.search_results) |*results| results.deinit(gpa); - state.search_results = null; - } - - fn dropSelection(state: *@This(), gpa: std.mem.Allocator) void { - if (state.selection) |*selection| selection.deinit(gpa); - state.selection = null; - if (state.selection_text.len > 0) gpa.free(state.selection_text); - state.selection_text = &.{}; - state.selection_anchor = null; - state.selection_head = null; - } - - /// Transactionally replace the word-snapped selection and its owned text. - /// `stationary` is reserved for the UI's pre-probe drag check; this state - /// operation returns only failed, unchanged, or changed. - pub fn setSelection( - state: *@This(), - gpa: std.mem.Allocator, - start: Point, - end: Point, - invalidate_raster: bool, - ) SelectionUpdate { - if (state.selection != null and - state.selection_anchor != null and state.selection_head != null and - state.selection_anchor.?.x == start.x and state.selection_anchor.?.y == start.y and - state.selection_head.?.x == end.x and state.selection_head.?.y == end.y) return .unchanged; - var selection = state.document.select(gpa, state.page, start, end) catch return .failed; - const text = state.document.copySelection( - gpa, - state.page, - selection.start, - selection.end, - ) catch { - selection.deinit(gpa); - return .failed; - }; - - state.dropSelection(gpa); - state.selection = selection; - state.selection_text = text; - state.selection_anchor = start; - state.selection_head = end; - if (invalidate_raster) state.invalidateRaster(state.page); - return .changed; - } - - pub fn clearDrag(state: *@This()) void { - state.drag_anchor = null; - state.drag_head = null; - } - - pub fn clearSelection(state: *@This(), gpa: std.mem.Allocator) void { - const changed = state.selection != null or state.selection_text.len > 0; - state.dropSelection(gpa); - if (changed) state.invalidateRaster(state.page); - } - - /// Escape's cancel: everything transient a reader can SEE — the mouse - /// selection and the search overlay — and nothing that says WHERE in the - /// document they are. Page, scroll, fit and tint are what the pane is, not - /// chrome. Allocation-free, so it cannot half-cancel. - pub fn cancelChrome(state: *@This(), gpa: std.mem.Allocator) void { - state.clearDrag(); - state.clearSelection(gpa); - if (state.search_query.len == 0) return; - state.dropSearchQuery(gpa); - state.invalidateRaster(state.page); - } - - fn invalidatePage(state: *@This(), gpa: std.mem.Allocator) void { - state.dropSearchResults(gpa); - state.dropSelection(gpa); - state.clearDrag(); - if (state.text.len > 0) gpa.free(state.text); - state.text = &.{}; - state.text_tried = false; - state.text_scroll = 0; - state.text_scroll_clamp_pending = false; - state.highlights_dirty = state.search_query.len > 0; - state.search_reveal_pending = state.search_query.len > 0; - state.search_hit = 0; - } - - /// Forget the query, its hits, and every flag derived from them. Shared by - /// the cancel above and by the replacement below, which owns new bytes the - /// caller allocated before anything here was dropped. - fn dropSearchQuery(state: *@This(), gpa: std.mem.Allocator) void { - if (state.search_query.len > 0) gpa.free(state.search_query); - state.search_query = &.{}; - state.search_hit = 0; - state.dropSearchResults(gpa); - state.highlights_dirty = false; - state.search_reveal_pending = false; - } - - pub fn setSearchQuery(state: *@This(), gpa: std.mem.Allocator, query: []const u8) !void { - if (std.mem.eql(u8, state.search_query, query)) return; - const owned = try gpa.dupe(u8, query); - state.dropSearchQuery(gpa); - state.search_query = owned; - state.highlights_dirty = query.len > 0; - state.search_reveal_pending = query.len > 0; - state.invalidateRaster(state.page); - } - - pub fn ensureText(state: *@This(), gpa: std.mem.Allocator) []const u8 { - if (!state.text_tried) { - state.text_tried = true; - state.text = state.document.pageText(gpa, state.page) catch &.{}; - } - if (state.text_scroll_clamp_pending) { - const lines = std.mem.count(u8, state.text, "\n") + 1; - state.text_scroll = @min(state.text_scroll, lines - 1); - state.text_scroll_clamp_pending = false; - } - return state.text; - } - - pub fn resolveSearch(state: *@This(), gpa: std.mem.Allocator) void { - if (!state.highlights_dirty) return; - state.highlights_dirty = false; - state.dropSearchResults(gpa); - if (state.search_query.len == 0) return; - const results = state.document.search(gpa, state.page, state.search_query) catch return; - state.search_hit = if (results.hit_count == 0) - 0 - else - @min(state.search_hit, results.hit_count - 1); - state.search_results = results; - } - - pub fn ensureOutline(state: *@This(), gpa: std.mem.Allocator) ?*const pdf.Outline { - if (!state.outline_tried) { - state.outline_tried = true; - state.outline = state.document.outline(gpa) catch null; - } - return if (state.outline) |*outline| outline else null; - } - - pub fn renderSections( - state: *@This(), - pdf_gpa: std.mem.Allocator, - output_gpa: std.mem.Allocator, - ) ![]u8 { - const entries: []const pdf.OutlineEntry = if (state.ensureOutline(pdf_gpa)) |outline| - outline.entries - else - &.{}; - return SectionRows.render(output_gpa, state.path, entries); - } - - pub fn sectionDestination( - state: *@This(), - gpa: std.mem.Allocator, - ordinal: usize, - ) ?pdf.OutlineDestination { - const outline = state.ensureOutline(gpa) orelse return null; - return SectionRows.resolve(outline.entries, ordinal); - } - - /// Apply the one-based page/hit location encoded in a PDF search row. - /// Returns whether host pane cursor chrome must be reset. - pub fn focusLocation( - state: *@This(), - gpa: std.mem.Allocator, - line: usize, - column: usize, - ) bool { - const changed = line > 0 and state.activatePage(gpa, line - 1, true); - if (column > 0 and state.search_query.len > 0) { - state.search_hit = column - 1; - state.search_reveal_pending = true; - } - return changed; - } - - /// Change the document page while leaving pane cursor/selection chrome to - /// the UI adapter. Returns whether that pane-local chrome must be reset. - pub fn activatePage( - state: *@This(), - gpa: std.mem.Allocator, - page: usize, - reveal: bool, - ) bool { - state.outline_reveal_pending = null; - const next = @min(page, state.page_count -| 1); - const changed = next != state.page; - if (changed) { - state.invalidatePage(gpa); - state.page = next; - } - if (reveal) { - state.scroll_to_page_pending = true; - if (state.layout_valid) { - state.document_scroll_y = @floatFromInt(state.page_starts[next]); - state.scroll_to_page_pending = false; - } - } else { - state.search_reveal_pending = false; - } - return changed; - } - - pub fn toggleFit(state: *@This()) void { - state.fit = if (state.fit == .width) .height else .width; - state.pan_x = 0; - state.pan_y = 0; - state.layout_valid = false; - state.scroll_to_page_pending = true; - state.search_reveal_pending = state.search_query.len > 0; - } - - pub fn toggleTint(state: *@This()) void { - state.tint = state.tint.next(); - state.invalidateAllRasters(); - } - - pub fn queueOutlineReveal( - state: *@This(), - destination: pdf.OutlineInternalDestination, - ) void { - state.scroll_to_page_pending = false; - state.layout_anchor_pending = false; - state.outline_reveal_pending = destination; - } - - pub fn deinit(state: *@This(), gpa: std.mem.Allocator) void { - gpa.free(state.path); - for (state.rasters[0..state.rasters_len]) |raster| - if (raster.rgba.len > 0) gpa.free(raster.rgba); - for (state.spare[0..state.spare_len]) |rgba| gpa.free(rgba); - gpa.free(state.page_sizes); - gpa.free(state.page_starts); - gpa.free(state.page_heights); - if (state.text.len > 0) gpa.free(state.text); - if (state.search_query.len > 0) gpa.free(state.search_query); - if (state.search_results) |*results| results.deinit(gpa); - if (state.selection) |*selection| selection.deinit(gpa); - if (state.selection_text.len > 0) gpa.free(state.selection_text); - if (state.outline) |*outline| outline.deinit(gpa); - state.document.deinit(); - state.* = undefined; - } -} else void; - -test "feature-off PDF state is zero-sized" { - if (!enabled) try std.testing.expectEqual(@as(usize, 0), @sizeOf(State)); -} - -pub const SearchOutput = struct { - bytes: usize = 0, - rows: usize = 0, - anchor: ?usize = null, -}; - -pub fn textLines( - state: *State, - gpa: std.mem.Allocator, - arena: std.mem.Allocator, -) ![]const []const u8 { - if (comptime !enabled) return &.{}; - const page_text = state.ensureText(gpa); - const lines = try arena.alloc([]const u8, std.mem.count(u8, page_text, "\n") + 1); - var it = std.mem.splitScalar(u8, page_text, '\n'); - var n: usize = 0; - while (it.next()) |line| : (n += 1) lines[n] = line; - return lines; -} - -pub fn visibleText( - state: *State, - gpa: std.mem.Allocator, - arena: std.mem.Allocator, - max_rows: usize, -) ![]const u8 { - if (comptime !enabled) return ""; - const page_text = state.ensureText(gpa); - var start: usize = 0; - for (0..state.text_scroll) |_| { - const newline = std.mem.indexOfScalarPos(u8, page_text, start, '\n') orelse - return arena.dupe(u8, ""); - start = newline + 1; - } - if (max_rows == 0) return arena.dupe(u8, ""); - - var end = start; - var row: usize = 0; - while (row < max_rows) : (row += 1) { - const newline = std.mem.indexOfScalarPos(u8, page_text, end, '\n') orelse { - end = page_text.len; - break; - }; - if (row + 1 == max_rows) { - end = newline; - break; - } - end = newline + 1; - } - return arena.dupe(u8, page_text[start..end]); -} - -/// Materialize exact MuPDF logical hits as `path:PAGE:HIT query` rows. The -/// same hit numbering drives persistent highlights and later reveal actions. -pub fn searchRows( - state: *State, - gpa: std.mem.Allocator, - arena: std.mem.Allocator, - pattern: []const u8, - from_cursor: bool, - out: []u8, -) !SearchOutput { - if (comptime !enabled) return .{}; - try state.setSearchQuery(gpa, pattern); - const shown = std.fs.path.basename(state.path); - var result: SearchOutput = .{}; - const max_hits = 512; - var snippet_len = @min(pattern.len, 200); - while (snippet_len > 0 and snippet_len < pattern.len and pattern[snippet_len] & 0xc0 == 0x80) - snippet_len -= 1; - const snippet = pattern[0..snippet_len]; - for (0..state.page_count) |page| { - if (result.rows >= max_hits) break; - var found = try state.document.search(gpa, page, pattern); - defer found.deinit(gpa); - - const cursor_hit: ?usize = if (from_cursor and page == state.page) cursor: { - const selection = state.selection orelse break :cursor null; - for (found.quads) |item| { - const q = item.quad; - const center: Point = .{ - .x = (q.ul.x + q.ur.x + q.ll.x + q.lr.x) / 4, - .y = (q.ul.y + q.ur.y + q.ll.y + q.lr.y) / 4, - }; - if (selection.contains(center)) break :cursor item.hit; - } - break :cursor null; - } else null; - - for (0..found.hit_count) |hit_index| { - if (result.rows >= max_hits) break; - const line = try std.fmt.allocPrint(arena, "{s}:{d}:{d} {s}\n", .{ - shown, page + 1, hit_index + 1, snippet, - }); - if (line.len > out.len - result.bytes) return result; - if (from_cursor and - (page < state.page or - (page == state.page and cursor_hit != null and hit_index <= cursor_hit.?))) - result.anchor = result.rows; - @memcpy(out[result.bytes..][0..line.len], line); - result.bytes += line.len; - result.rows += 1; - } - } - return result; -} - -pub const Viewport = struct { pixel_w: u32, pixel_h: u32 }; -pub const VisiblePages = struct { first: usize = 0, len: usize = 0 }; -pub const PanAxis = enum { horizontal, vertical }; -pub const PanResult = enum { moved, edge, unavailable }; -pub const ScrollResult = struct { active_page: usize }; -pub const CellPixels = struct { w: u16, h: u16 }; -pub const NormalHost = enum { - none, - leader, - command_line, - search, - search_forward, - search_backward, -}; -pub const NormalResult = struct { - host: NormalHost = .none, - page_changed: bool = false, -}; - -const PlacedGeometry = struct { - geometry: image.NativeGeometry, - pixel_offset_y: f32, -}; - -pub const PlacedRaster = if (enabled) struct { - page: usize, - revision: u32, - fit: FitMode, - pan_x: u16, - geometry: image.NativeGeometry, - pixel_offset_y: f32, - rgba: []const u8, - width: usize, - band_height: usize, -} else void; - -const VisibleRows = struct { - base: image.NativeGeometry, - y0: u32, - y1: u32, - dst_y: u32, - dst_h: u32, - pixel_offset_y: f32, -}; - -pub fn renderRequest(viewport: Viewport, policy: RasterPolicy) RenderRequest { - if (comptime !enabled) return; - return .{ - .dpi = policy.dpi, - .minimum_width = if (policy.match_viewport) viewport.pixel_w else 0, - .minimum_height = if (policy.match_viewport) viewport.pixel_h else 0, - .max_dimension = policy.max_dimension, - }; -} - -fn pageHeight(size: pdf.PageSize, viewport: Viewport, fit: FitMode) u32 { - if (comptime !enabled) return 0; - if (fit == .height) return viewport.pixel_h; - const scaled = @as(f64, @floatFromInt(viewport.pixel_w)) * - @as(f64, size.height) / @as(f64, size.width); - return @max(1, @as(u32, @intFromFloat(@min( - @as(f64, @floatFromInt(std.math.maxInt(u32))), - @round(scaled), - )))); -} - -fn pageAtOffset(state: *const State, offset: f64) usize { - if (comptime !enabled) return 0; - const y: u64 = @intFromFloat(std.math.clamp( - @floor(offset), - 0, - @as(f64, @floatFromInt(state.document_height -| 1)), - )); - var lo: usize = 0; - var hi: usize = state.page_count; - while (lo + 1 < hi) { - const mid = lo + (hi - lo) / 2; - if (state.page_starts[mid] <= y) lo = mid else hi = mid; - } - const end = state.page_starts[lo] + state.page_heights[lo]; - return if (y >= end and lo + 1 < state.page_count) lo + 1 else lo; -} - -fn pageVisible(state: *const State, page: usize, viewport: Viewport) bool { - if (comptime !enabled) return false; - const top = @as(f64, @floatFromInt(state.page_starts[page])) - state.document_scroll_y; - const bottom = top + @as(f64, @floatFromInt(state.page_heights[page])); - return bottom > 0 and top < @as(f64, @floatFromInt(viewport.pixel_h)); -} - -pub fn visiblePages(state: *const State, viewport: Viewport) VisiblePages { - if (comptime !enabled) return .{}; - var out: VisiblePages = .{}; - var page = pageAtOffset(state, state.document_scroll_y); - if (page > 0 and pageVisible(state, page - 1, viewport)) page -= 1; - out.first = page; - while (page < state.page_count) : (page += 1) { - const top = @as(f64, @floatFromInt(state.page_starts[page])) - state.document_scroll_y; - if (top >= @as(f64, @floatFromInt(viewport.pixel_h))) break; - if (pageVisible(state, page, viewport)) out.len += 1; - } - return out; -} - -fn visibleContains(visible: VisiblePages, page: usize) bool { - return page >= visible.first and page - visible.first < visible.len; -} - -pub fn rasterForPage(state: *State, page: usize) ?*Raster { - if (comptime !enabled) return null; - for (state.rasters[0..state.rasters_len]) |*raster| - if (raster.valid and raster.page == page) return raster; - return null; -} - -fn rasterForPageConst(state: *const State, page: usize) ?*const Raster { - if (comptime !enabled) return null; - for (state.rasters[0..state.rasters_len]) |*raster| - if (raster.valid and raster.page == page) return raster; - return null; -} - -fn visibleRows( - state: *const State, - viewport: Viewport, - page: usize, - iw: usize, - ih: usize, -) ?VisibleRows { - if (comptime !enabled) return null; - const page_h = state.page_heights[page]; - const base = image.nativeGeometry( - iw, - ih, - viewport.pixel_w, - page_h, - switch (state.fit) { - .width => .width, - .height => .height, - }, - state.pan_x, - 0, - ) orelse return null; - if (base.dst.h == 0 or base.src.h == 0) return null; - - const scroll_floor = @floor(state.document_scroll_y); - const fractional: f32 = @floatCast(state.document_scroll_y - scroll_floor); - const scroll_i: i64 = @intFromFloat(@min( - scroll_floor, - @as(f64, @floatFromInt(std.math.maxInt(i64))), - )); - const start_i: i64 = @intCast(@min( - state.page_starts[page], - @as(u64, std.math.maxInt(i64)), - )); - const full_y = start_i - scroll_i + @as(i64, base.dst.y); - const full_bottom = full_y + @as(i64, base.dst.h); - const visible_y = @max(@as(i64, 0), full_y); - const visible_bottom = @min(@as(i64, viewport.pixel_h), full_bottom); - if (visible_bottom <= visible_y) return null; - - const rel_y0: u64 = @intCast(visible_y - full_y); - const rel_y1: u64 = @intCast(visible_bottom - full_y); - const src_y0: u32 = base.src.y + @as(u32, @intCast( - rel_y0 * base.src.h / base.dst.h, - )); - const src_y1: u32 = base.src.y + @as(u32, @intCast(@min( - @as(u64, base.src.h), - (rel_y1 * base.src.h + base.dst.h - 1) / base.dst.h, - ))); - if (src_y1 <= src_y0) return null; - return .{ - .base = base, - .y0 = src_y0, - .y1 = src_y1, - .dst_y = @intCast(visible_y), - .dst_h = @intCast(visible_bottom - visible_y), - .pixel_offset_y = -fractional, - }; -} - -fn placedGeometry( - state: *const State, - raster: *const Raster, - viewport: Viewport, - page: usize, -) ?PlacedGeometry { - if (comptime !enabled) return null; - const rows = visibleRows(state, viewport, page, raster.iw, raster.ih) orelse return null; - const band_y: u32 = @intCast(raster.band_y); - const band_end: u32 = @intCast(raster.band_y + raster.band_h); - if (rows.y0 < band_y or rows.y1 > band_end) return null; - return .{ - .geometry = .{ - .src = .{ - .x = rows.base.src.x, - .y = rows.y0 - band_y, - .w = rows.base.src.w, - .h = rows.y1 - rows.y0, - }, - .dst = .{ - .x = rows.base.dst.x, - .y = rows.dst_y, - .w = rows.base.dst.w, - .h = rows.dst_h, - }, - }, - .pixel_offset_y = rows.pixel_offset_y, - }; -} - -pub fn placedRaster(state: *const State, viewport: Viewport, page: usize) ?PlacedRaster { - if (comptime !enabled) return null; - const raster = rasterForPageConst(state, page) orelse return null; - if (raster.rgba.len == 0) return null; - const placed = placedGeometry(state, raster, viewport, page) orelse return null; - return .{ - .page = page, - .revision = raster.revision, - .fit = state.fit, - .pan_x = state.pan_x, - .geometry = placed.geometry, - .pixel_offset_y = placed.pixel_offset_y, - .rgba = raster.rgba, - .width = raster.iw, - .band_height = raster.band_h, - }; -} - -pub fn activeGeometry(state: *const State, viewport: Viewport) ?image.NativeGeometry { - if (comptime !enabled) return null; - const raster = rasterForPageConst(state, state.page) orelse return null; - const placed = placedGeometry(state, raster, viewport, state.page) orelse return null; - return placed.geometry; -} - -pub fn pageAtViewportY(state: *const State, local_y: f64) ?usize { - if (comptime !enabled) return null; - if (!state.layout_valid or !std.math.isFinite(local_y) or local_y < 0) return null; - const document_y = state.document_scroll_y + local_y; - const page = pageAtOffset(state, document_y); - const start: f64 = @floatFromInt(state.page_starts[page]); - if (document_y < start or - document_y >= start + @as(f64, @floatFromInt(state.page_heights[page]))) return null; - return page; -} - -pub fn pageReady(state: *const State, viewport: Viewport, page: usize) bool { - if (comptime !enabled) return false; - return placedRaster(state, viewport, page) != null; -} - -pub fn nativeReady(state: *const State, viewport: Viewport) bool { - if (comptime !enabled) return false; - for (state.rasters[0..state.rasters_len]) |*raster| { - if (raster.valid and raster.rgba.len > 0 and - placedGeometry(state, raster, viewport, raster.page) != null) return true; - } - return false; -} - -pub fn pointAtPage( - state: *const State, - viewport: Viewport, - page: usize, - px: i64, - py: i64, - clamp_to_page: bool, -) ?Point { - if (comptime !enabled) return null; - const raster = rasterForPageConst(state, page) orelse return null; - if (raster.rgba.len == 0) return null; - const placed = placedGeometry(state, raster, viewport, page) orelse return null; - return pointAtGeometry( - placed.geometry, - placed.pixel_offset_y, - raster.iw, - raster.ih, - raster.band_y, - px, - py, - clamp_to_page, - ); -} - -fn slotShape(slot: *const Raster) pdf.Raster { - const stride = slot.iw * 4; - return .{ .width = slot.iw, .height = slot.ih, .stride = stride, .len = stride * slot.ih }; -} - -fn flinging(state: *const State, viewport: Viewport) bool { - if (comptime !enabled) return false; - return state.scroll_travel >= @as(f64, @floatFromInt(viewport.pixel_h)); -} - -fn wantedBand( - state: *const State, - viewport: Viewport, - page: usize, - shape: pdf.Raster, - is_flinging: bool, -) pdf.Raster.Band { - if (!is_flinging) return shape.wholePage(); - const rows = visibleRows(state, viewport, page, shape.width, shape.height) orelse - return shape.wholePage(); - const first = (@as(usize, rows.y0) / band_grain) * band_grain; - const last = std.math.divCeil(usize, @as(usize, rows.y1), band_grain) catch - return shape.wholePage(); - return shape.band(first, last * band_grain - first); -} - -/// Keep exactly the visible page rasters resident and refresh only stale or -/// uncovered bands. Rendering is transactional: existing pixels remain -/// presentable until a replacement is fully rendered and tinted. -fn reconcile( - state: *State, - gpa: std.mem.Allocator, - request: RenderRequest, - tint_key: TintKey, - highlights: Highlights, - visible: VisiblePages, - viewport: Viewport, -) void { - if (comptime !enabled) return; - const tz = tracy.zone(@src(), "pdf.reconcile"); - defer tz.end(); - - // Remove first so arriving pages can claim departing page buffers. Only - // the final visible set can be seen, so a fling skips crossed-over pages. - var index: usize = 0; - while (index < state.rasters_len) { - if (visibleContains(visible, state.rasters[index].page)) { - index += 1; - continue; - } - state.retireRaster(gpa, &state.rasters[index]); - state.rasters_len -= 1; - if (index != state.rasters_len) - state.rasters[index] = state.rasters[state.rasters_len]; - } - - const is_flinging = flinging(state, viewport); - var page = visible.first; - const end = visible.first + visible.len; - while (page < end) : (page += 1) { - var raster = rasterForPage(state, page); - if (raster == null) { - if (state.rasters_len == state.rasters.len) continue; - state.rasters[state.rasters_len] = .{ .valid = true, .page = page }; - state.rasters_len += 1; - raster = &state.rasters[state.rasters_len - 1]; - } - const slot = raster.?; - const page_highlights = highlights.forPage(page, state.page); - const decorated = page_highlights.len > 0; - const stale = !slot.tried or !slot.request_valid or - !slot.request.eql(request) or slot.decorated != decorated or - slot.tint_key == null or !slot.tint_key.?.eql(tint_key) or - slot.rgba.len == 0 or slot.band_h == 0; - const uncovered = !stale and uncovered: { - const want = wantedBand(state, viewport, page, slotShape(slot), is_flinging); - break :uncovered slot.band_y > want.y or - slot.band_y + slot.band_h < want.y + want.height; - }; - if (!stale and !uncovered) continue; - - slot.tried = true; - slot.request = request; - slot.request_valid = true; - const shape_or_null = shape: { - const tz_measure = tracy.zone(@src(), "pdf.measure"); - defer tz_measure.end(); - break :shape state.document.measureRenderAt(page, request) catch null; - }; - const shape = shape_or_null orelse continue; - const want = wantedBand(state, viewport, page, shape, is_flinging); - const fresh = state.claimRgba(gpa, want.len) orelse continue; - const filled = filled: { - { - const tz_render = tracy.zone(@src(), "pdf.render_into"); - defer tz_render.end(); - state.document.renderIntoAt( - page, - request, - shape, - want, - page_highlights, - fresh, - ) catch break :filled false; - } - const tz_tint = tracy.zone(@src(), "pdf.tint"); - defer tz_tint.end(); - pdf.tintRgba(fresh, tint_key.mode, tint_key.colors) catch - break :filled false; - break :filled true; - }; - if (!filled) { - state.retireRgba(gpa, fresh); - continue; - } - - state.retireRgba(gpa, slot.rgba); - slot.rgba = fresh; - slot.iw = shape.width; - slot.ih = shape.height; - slot.band_y = want.y; - slot.band_h = want.height; - slot.decorated = decorated; - slot.tint_key = tint_key; - state.next_raster_revision +%= 1; - if (state.next_raster_revision == 0) state.next_raster_revision = 1; - slot.revision = state.next_raster_revision; - } - state.trimSpares(gpa); -} - -/// Resolve all pane-owned render decisions for one surface frame. The caller -/// supplies only backend policy, theme-derived tint/highlight colors, and the -/// viewport; it then transports the returned visible placements to Surface. -pub fn renderFrame( - state: *State, - gpa: std.mem.Allocator, - arena: std.mem.Allocator, - viewport: Viewport, - policy: RasterPolicy, - tint_key: TintKey, - highlight_input: HighlightInput, -) VisiblePages { - if (comptime !enabled) return .{}; - ensureLayout(state, viewport); - state.resolveSearch(gpa); - const highlights = buildHighlights(state, arena, highlight_input) catch Highlights{ - .items = &.{}, - .active_start = 0, - .hover_page = null, - }; - const request = renderRequest(viewport, policy); - var visible = visiblePages(state, viewport); - reconcile(state, gpa, request, tint_key, highlights, visible, viewport); - - rearmSearchReveal(state, viewport); - revealSearch(state, viewport, activeGeometry(state, viewport)); - visible = visiblePages(state, viewport); - reconcile(state, gpa, request, tint_key, highlights, visible, viewport); - return visible; -} - -pub fn normalizedPixel(value: f32, dimension: usize) u32 { - const scaled = std.math.clamp(value, 0, 1) * @as(f32, @floatFromInt(dimension)); - return @intCast(@min(dimension - 1, @as(usize, @intFromFloat(scaled)))); -} - -pub fn scaledStep(base: u32, count: u32) u32 { - return @intCast(@min( - @as(u64, std.math.maxInt(u32)), - @as(u64, base) * @max(@as(u64, 1), count), - )); -} - -pub fn scrollDocument(state: *State, viewport: Viewport, delta_pixels: f64) ?ScrollResult { - if (comptime !enabled) return null; - if (!std.math.isFinite(delta_pixels) or delta_pixels == 0) return null; - const max_scroll = @as(f64, @floatFromInt(state.document_height -| viewport.pixel_h)); - const next = std.math.clamp(state.document_scroll_y + delta_pixels, 0, max_scroll); - if (next == state.document_scroll_y) return null; - state.scroll_travel += @abs(next - state.document_scroll_y); - state.document_scroll_y = next; - return .{ .active_page = pageAtOffset(state, next) }; -} - -pub fn panPixels( - state: *State, - geometry: image.NativeGeometry, - axis: PanAxis, - direction: i8, - display_pixels: u32, -) PanResult { - if (comptime !enabled) return .unavailable; - const raster = rasterForPage(state, state.page) orelse return .unavailable; - const source_full: u32 = @intCast(switch (axis) { - .horizontal => raster.iw, - .vertical => raster.ih, - }); - const crop = switch (axis) { - .horizontal => geometry.src.w, - .vertical => geometry.src.h, - }; - const source_at = switch (axis) { - .horizontal => geometry.src.x, - .vertical => geometry.src.y, - }; - const displayed = @max(@as(u32, 1), switch (axis) { - .horizontal => geometry.dst.w, - .vertical => geometry.dst.h, - }); - const overflow = source_full -| crop; - if (overflow == 0 or - (direction < 0 and source_at == 0) or - (direction > 0 and source_at >= overflow)) return .edge; - - const source_step = @max( - @as(u64, 1), - (@as(u64, display_pixels) * @as(u64, crop) + displayed - 1) / displayed, - ); - const normalized_step: u32 = @intCast(@min( - @as(u64, std.math.maxInt(u16)), - @max( - @as(u64, 1), - (source_step * std.math.maxInt(u16) + overflow - 1) / overflow, - ), - )); - const position = switch (axis) { - .horizontal => &state.pan_x, - .vertical => &state.pan_y, - }; - if (direction > 0) { - position.* = @intCast(@min( - @as(u32, std.math.maxInt(u16)), - @as(u32, position.*) + normalized_step, - )); - } else { - position.* -|= @intCast(normalized_step); - } - return .moved; -} - -fn setHorizontalEdge(state: *State, geometry: image.NativeGeometry, end: bool) void { - if (comptime !enabled) return; - const raster = rasterForPage(state, state.page) orelse return; - if (raster.iw <= geometry.src.w) return; - state.pan_x = if (end) std.math.maxInt(u16) else 0; -} - -fn rearmSearchReveal(state: *State, viewport: Viewport) void { - if (comptime !enabled) return; - if (state.search_query.len == 0) return; - if (!state.reveal_viewport_valid or - state.reveal_viewport_w != viewport.pixel_w or - state.reveal_viewport_h != viewport.pixel_h or - state.reveal_fit != state.fit) - state.search_reveal_pending = true; -} - -pub fn revealSearch( - state: *State, - viewport: Viewport, - geometry: ?image.NativeGeometry, -) void { - if (comptime !enabled) return; - if (!state.search_reveal_pending) return; - state.reveal_viewport_w = viewport.pixel_w; - state.reveal_viewport_h = viewport.pixel_h; - state.reveal_fit = state.fit; - state.reveal_viewport_valid = true; - const results = state.search_results orelse { - state.search_reveal_pending = false; - return; - }; - if (results.hit_count == 0 or results.quads.len == 0) { - state.search_reveal_pending = false; - return; - } - state.search_hit = @min(state.search_hit, results.hit_count - 1); - const q = for (results.quads) |item| { - if (item.hit == state.search_hit) break item.quad; - } else { - state.search_reveal_pending = false; - return; - }; - state.search_reveal_pending = false; - const center_x = (q.ul.x + q.ur.x + q.ll.x + q.lr.x) / 4; - const center_y = (q.ul.y + q.ur.y + q.ll.y + q.lr.y) / 4; - if (state.fit == .width) { - ensureLayout(state, viewport); - const page_y = @as(f64, @floatFromInt(state.page_starts[state.page])) + - @as(f64, center_y) * @as(f64, @floatFromInt(state.page_heights[state.page])); - const wanted = page_y - @as(f64, @floatFromInt(viewport.pixel_h)) / 2; - const max_scroll = @as(f64, @floatFromInt(state.document_height -| viewport.pixel_h)); - state.document_scroll_y = std.math.clamp(wanted, 0, max_scroll); - return; - } - const placed = geometry orelse return; - const raster = rasterForPage(state, state.page) orelse return; - const full: u32 = @intCast(raster.iw); - const at = normalizedPixel(center_x, raster.iw); - if (at >= placed.src.x and at < placed.src.x + placed.src.w) return; - const overflow = full -| placed.src.w; - if (overflow == 0) return; - const wanted = @min(overflow, at -| placed.src.w / 2); - state.pan_x = @intCast( - (@as(u64, wanted) * std.math.maxInt(u16) + overflow / 2) / overflow, - ); -} - -pub fn stepPage(state: *State, gpa: std.mem.Allocator, delta: i64) bool { - const current: i64 = @intCast(state.page); - const last: i64 = @intCast(state.page_count -| 1); - return state.activatePage( - gpa, - @intCast(std.math.clamp(current + delta, 0, last)), - true, - ); -} - -fn scrollNormal( - state: *State, - gpa: std.mem.Allocator, - viewport: ?Viewport, - delta_pixels: f64, -) bool { - const view = viewport orelse return false; - ensureLayout(state, view); - const result = scrollDocument(state, view, delta_pixels) orelse return false; - return result.active_page != state.page and - state.activatePage(gpa, result.active_page, false); -} - -fn moveRows( - state: *State, - gpa: std.mem.Allocator, - native_images: bool, - viewport: ?Viewport, - cell_pixels: CellPixels, - direction: i8, - count: u32, -) bool { - if (!native_images) { - const pages: i64 = @intCast(@max(@as(u32, 1), count)); - return stepPage(state, gpa, if (direction > 0) pages else -pages); - } - return scrollNormal( - state, - gpa, - viewport, - @as(f64, @floatFromInt(scaledStep(cell_pixels.h, count))) * direction, - ); -} - -fn movePage( - state: *State, - gpa: std.mem.Allocator, - native_images: bool, - viewport: ?Viewport, - cell_pixels: CellPixels, - direction: i8, - kind: normal_input.Page, - count: u32, -) bool { - if (!native_images) { - const pages: i64 = @intCast(@max(@as(u32, 1), count)); - return stepPage(state, gpa, if (direction > 0) pages else -pages); - } - const base: u32 = switch (kind) { - .half_down, .half_up => if (viewport) |view| - @max(@as(u32, 1), view.pixel_h / 2) - else - cell_pixels.h, - .down, .up => if (viewport) |view| view.pixel_h else cell_pixels.h, - }; - return scrollNormal( - state, - gpa, - viewport, - @as(f64, @floatFromInt(scaledStep(base, count))) * direction, - ); -} - -/// Apply the PDF-owned portion of one parsed normal-mode action. The result -/// carries only host UI work; document page/search/pan/scroll state is updated -/// here directly from plain inputs. -pub fn applyNormal( - state: *State, - gpa: std.mem.Allocator, - semantic: normal_input.Action, - native_images: bool, - cell_pixels: CellPixels, - viewport: ?Viewport, - geometry: ?image.NativeGeometry, -) NormalResult { - if (comptime !enabled) return .{}; - var result: NormalResult = .{}; - switch (semantic) { - // Escape stays in the document and cancels what is drawn over it. The - // way OUT of a PDF is Shift-Escape, which the host takes before this - // parse ever runs — a reader who pressed Escape to drop a selection - // was not asking to be moved to another pane. - .escape => state.cancelChrome(gpa), - .move => |move| switch (move.motion) { - .down => result.page_changed = moveRows( - state, - gpa, - native_images, - viewport, - cell_pixels, - 1, - move.count, - ), - .up => result.page_changed = moveRows( - state, - gpa, - native_images, - viewport, - cell_pixels, - -1, - move.count, - ), - .left => if (native_images) if (geometry) |placed| { - _ = panPixels(state, placed, .horizontal, -1, scaledStep(cell_pixels.w, move.count)); - }, - .right => if (native_images) if (geometry) |placed| { - _ = panPixels(state, placed, .horizontal, 1, scaledStep(cell_pixels.w, move.count)); - }, - else => {}, - }, - .goto => |go| switch (go.target) { - .file_start => result.page_changed = state.activatePage( - gpa, - if (go.explicit_count) go.count -| 1 else 0, - true, - ), - .last_line => result.page_changed = state.activatePage(gpa, state.page_count -| 1, true), - .line_start, .first_nonws => if (native_images) if (geometry) |placed| - setHorizontalEdge(state, placed, false), - .line_end => if (native_images) if (geometry) |placed| - setHorizontalEdge(state, placed, true), - .line_down => result.page_changed = moveRows( - state, - gpa, - native_images, - viewport, - cell_pixels, - 1, - go.count, - ), - .line_up => result.page_changed = moveRows( - state, - gpa, - native_images, - viewport, - cell_pixels, - -1, - go.count, - ), - else => {}, - }, - .line => |line| switch (line) { - .start, .first_nonws => if (native_images) if (geometry) |placed| - setHorizontalEdge(state, placed, false), - .end => if (native_images) if (geometry) |placed| - setHorizontalEdge(state, placed, true), - }, - .goto_line => |go| { - if (go.explicit) - result.page_changed = state.activatePage(gpa, go.count -| 1, true); - }, - .page => |page| result.page_changed = switch (page.kind) { - .half_down, .down => movePage( - state, - gpa, - native_images, - viewport, - cell_pixels, - 1, - page.kind, - page.count, - ), - .half_up, .up => movePage( - state, - gpa, - native_images, - viewport, - cell_pixels, - -1, - page.kind, - page.count, - ), - }, - .view => |view| result.page_changed = switch (view) { - .scroll_down => moveRows(state, gpa, native_images, viewport, cell_pixels, 1, 1), - .scroll_up => moveRows(state, gpa, native_images, viewport, cell_pixels, -1, 1), - else => false, - }, - .leader => result.host = .leader, - .command_line => result.host = .command_line, - .search => result.host = .search, - .search_step => |direction| result.host = if (direction == .forward) - .search_forward - else - .search_backward, - else => {}, - } - return result; -} - -pub fn captureLayoutAnchor(state: *State) void { - if (comptime !enabled) return; - if (!state.layout_valid or state.page_count == 0 or state.document_height == 0) return; - const page = pageAtOffset(state, state.document_scroll_y); - const start: f64 = @floatFromInt(state.page_starts[page]); - const height: f64 = @floatFromInt(@max(@as(u32, 1), state.page_heights[page])); - state.layout_anchor_page = page; - state.layout_anchor_fraction = std.math.clamp((state.document_scroll_y - start) / height, 0, 1); - state.layout_anchor_pending = true; -} - -fn consumeOutlineReveal(state: *State, viewport: Viewport) void { - const destination = state.outline_reveal_pending orelse return; - state.outline_reveal_pending = null; - const page = @min(destination.page, state.page_count -| 1); - const size = state.page_sizes[page]; - const raw_y = destination.y orelse 0; - const y = if (std.math.isFinite(raw_y)) std.math.clamp(raw_y, 0, size.height) else 0; - state.document_scroll_y = @as(f64, @floatFromInt(state.page_starts[page])) + - @as(f64, y) / @as(f64, size.height) * @as(f64, @floatFromInt(state.page_heights[page])); - - if (destination.x) |raw_x| if (state.fit == .height and std.math.isFinite(raw_x)) { - const display_width = @as(f64, @floatFromInt(viewport.pixel_h)) * - @as(f64, size.width) / @as(f64, size.height); - const viewport_width: f64 = @floatFromInt(viewport.pixel_w); - if (display_width > viewport_width) { - const x = std.math.clamp(raw_x, 0, size.width); - const target = @as(f64, x) / @as(f64, size.width) * display_width; - const overflow = display_width - viewport_width; - const wanted = std.math.clamp(target - viewport_width / 2, 0, overflow); - state.pan_x = @intFromFloat(@round( - wanted / overflow * @as(f64, std.math.maxInt(u16)), - )); - } - }; - state.search_reveal_pending = false; - state.reveal_viewport_w = viewport.pixel_w; - state.reveal_viewport_h = viewport.pixel_h; - state.reveal_fit = state.fit; - state.reveal_viewport_valid = true; -} - -pub fn ensureLayout(state: *State, viewport: Viewport) void { - if (comptime !enabled) return; - const tz = tracy.zone(@src(), "pdf.ensure_layout"); - defer tz.end(); - if (state.layout_valid and !state.scroll_to_page_pending and - !state.layout_anchor_pending and - (state.layout_viewport_w != viewport.pixel_w or - state.layout_viewport_h != viewport.pixel_h)) captureLayoutAnchor(state); - if (!state.layout_valid or state.layout_viewport_w != viewport.pixel_w or - state.layout_viewport_h != viewport.pixel_h or state.layout_fit != state.fit) - { - var at: u64 = 0; - for (state.page_sizes, 0..) |size, page| { - state.page_starts[page] = at; - const height = pageHeight(size, viewport, state.fit); - state.page_heights[page] = height; - at = std.math.add(u64, at, height) catch std.math.maxInt(u64); - if (page + 1 < state.page_count) - at = std.math.add(u64, at, page_gap_px) catch std.math.maxInt(u64); - } - state.document_height = at; - state.layout_viewport_w = viewport.pixel_w; - state.layout_viewport_h = viewport.pixel_h; - state.layout_fit = state.fit; - state.layout_valid = true; - if (state.scroll_to_page_pending) { - state.document_scroll_y = @floatFromInt(state.page_starts[state.page]); - state.scroll_to_page_pending = false; - state.layout_anchor_pending = false; - } else if (state.layout_anchor_pending) { - const page = @min(state.layout_anchor_page, state.page_count -| 1); - state.document_scroll_y = @as(f64, @floatFromInt(state.page_starts[page])) + - state.layout_anchor_fraction * @as(f64, @floatFromInt(state.page_heights[page])); - state.layout_anchor_pending = false; - } - } - consumeOutlineReveal(state, viewport); - const max_scroll = @as(f64, @floatFromInt(state.document_height -| viewport.pixel_h)); - state.document_scroll_y = std.math.clamp(state.document_scroll_y, 0, max_scroll); -} - -/// The owned result of asking MuPDF for the word at one page-space point. -/// It deliberately carries no pane state: callers may retain it for a hover -/// or consume it for Look without installing a user selection or activating a -/// page. Quads and text have separate lifetimes in MuPDF, and remain separate -/// here rather than making a transient hover impersonate `pdf.Selection`. -pub const WordProbe = if (enabled) struct { - page: usize, - quads: []pdf.Quad, - text: []u8, - - pub fn deinit(probe: *@This(), gpa: std.mem.Allocator) void { - gpa.free(probe.quads); - gpa.free(probe.text); - probe.* = undefined; - } -} else void; - -/// Complete state of one native PDF pointer gesture. Core stores this beside -/// its generic drag routing; every PDF-specific transition is implemented by -/// pointerStart/pointerUpdate/pointerRelease below. The feature-off spelling -/// is deliberately empty so a build without MuPDF carries no latent UI state. -pub const PointerDrag = if (enabled) struct { - native: bool = false, - /// Right-button Look probes this cell on release without borrowing or - /// replacing the pane's persistent MuPDF selection. - word_at: ?struct { col: u16, row: u16 } = null, - /// Drag updates keep selection geometry/text live, but their expensive - /// baked raster highlight is committed once on release. - selection_changed: bool = false, -} else struct {}; - -pub const PointerAction = enum { look, exec }; - -/// Plain post-transaction work for the core. `text` is either pane-owned -/// selection text or a slice owned by `probe`; both stay valid through the -/// immediate builtin dispatch. Only the independent probe allocation is -/// released afterward, so Exec may delete the source pane safely. -pub const PointerRelease = if (enabled) struct { - action: ?PointerAction = null, - text: []const u8 = &.{}, - probe: ?WordProbe = null, - - pub fn deinit(release: *@This(), gpa: std.mem.Allocator) void { - if (release.probe) |*probe| probe.deinit(gpa); - release.* = undefined; - } -} else struct { - pub fn deinit(_: *@This(), _: std.mem.Allocator) void {} -}; - -/// Word-snap a point and copy its text without changing document or UI state. -/// Empty MuPDF selections are reported as `null`; every non-null result owns -/// both slices and must be deinitialized by the caller. -pub fn probeWord( - document: *Document, - gpa: std.mem.Allocator, - page: usize, - point: if (enabled) pdf.Point else void, -) !?WordProbe { - if (comptime !enabled) return null; - var selection = try document.select(gpa, page, point, point); - errdefer selection.deinit(gpa); - const text = try document.copySelection(gpa, page, selection.start, selection.end); - errdefer gpa.free(text); - if (selection.quads.len == 0 or text.len == 0) { - selection.deinit(gpa); - gpa.free(text); - return null; - } - // Transfer the quad allocation out of Selection. There is intentionally - // no Selection.deinit on this success path: WordProbe is now its owner. - return .{ .page = page, .quads = selection.quads, .text = text }; -} - -/// Invert the exact native placement of one retained raster band. The -/// destination is shifted by `pixel_offset_y` at presentation time, while its -/// source y is local to the retained band; both adjustments happen here before -/// returning normalized full-page coordinates. -pub fn pointAtGeometry( - geometry: image.NativeGeometry, - pixel_offset_y: f32, - full_width: usize, - full_height: usize, - band_y: usize, - pixel_x: i64, - pixel_y: i64, - clamp_to_page: bool, -) ?Point { - if (comptime !enabled) return null; - if (full_width == 0 or full_height == 0 or - geometry.src.w == 0 or geometry.src.h == 0 or - geometry.dst.w == 0 or geometry.dst.h == 0) return null; - - const left: f64 = @floatFromInt(geometry.dst.x); - const top: f64 = @floatFromInt(geometry.dst.y); - const right = left + @as(f64, @floatFromInt(geometry.dst.w)); - const bottom = top + @as(f64, @floatFromInt(geometry.dst.h)); - var x: f64 = @floatFromInt(pixel_x); - var y: f64 = @as(f64, @floatFromInt(pixel_y)) - @as(f64, pixel_offset_y); - if (clamp_to_page) { - // Half-open rectangles: keep a clamped point infinitesimally inside - // the last presented pixel instead of letting it become `right`. - const epsilon = 1.0 / 1024.0; - x = std.math.clamp(x, left, @max(left, right - epsilon)); - y = std.math.clamp(y, top, @max(top, bottom - epsilon)); - } else if (x < left or x >= right or y < top or y >= bottom) { - return null; - } - - const source_x_f = @as(f64, @floatFromInt(geometry.src.x)) + - (x - left) * @as(f64, @floatFromInt(geometry.src.w)) / - @as(f64, @floatFromInt(geometry.dst.w)); - const source_y_f = @as(f64, @floatFromInt(geometry.src.y)) + - (y - top) * @as(f64, @floatFromInt(geometry.src.h)) / - @as(f64, @floatFromInt(geometry.dst.h)); - const source_x: usize = @min(full_width - 1, @as(usize, @intFromFloat(@floor(source_x_f)))); - const band_source_y: usize = @intFromFloat(@floor(source_y_f)); - const source_y = @min(full_height - 1, band_y + band_source_y); - return .{ - .x = (@as(f32, @floatFromInt(source_x)) + 0.5) / - @as(f32, @floatFromInt(full_width)), - .y = (@as(f32, @floatFromInt(source_y)) + 0.5) / - @as(f32, @floatFromInt(full_height)), - }; -} - -// ---- core seam ---------------------------------------------------------- -// -// These functions own everything a pane does because its payload is a PDF. -// Pardes supplies the shared layout rectangle, allocators and Surface; this -// module changes the PDF state and paints its native attachments directly. -// Cross-pane placement remains a tiny Pardes primitive; the PDF-specific -// +PdfSections ownership and Look adapter live here beside their state. - -pub fn openPane( - core: *pardes.Pardes, - id: usize, - path: []const u8, - page_one_based: usize, -) !*pardes.Pane { - if (comptime !enabled) return error.PdfDisabled; - var state = try State.open(core.pdf_gpa, path, page_one_based); - errdefer state.deinit(core.pdf_gpa); - const pane = try core.newDocPane(id); - pane.pdf = state; - pane.cur_pinned = true; - core.emit(.{ .watch = .{ .pane = @intCast(id), .on = true } }); - return pane; -} - -/// Release a PDF payload while its pane slot is still installed, so the host -/// can retire the corresponding directory watch before that id is reused. -pub fn deinitPane(core: *pardes.Pardes, pane: *pardes.Pane, state: *State) void { - if (comptime !enabled) return; - for (core.panes, 0..) |slot, id| { - if (slot == pane) core.emit(.{ .watch = .{ .pane = @intCast(id), .on = false } }); - } - state.deinit(core.pdf_gpa); -} - -/// Reopen one live pane after its watched path changed. MuPDF deliberately -/// reopens the pathname so it can retain random access without requiring a -/// native watcher to allocate and copy the whole document first. -pub fn reloadPane( - core: *pardes.Pardes, - pane: *pardes.Pane, -) !void { - if (comptime !enabled) return error.PdfDisabled; - const state = &(pane.pdf orelse return error.MissingPdfState); - try state.reload(core.pdf_gpa); - resetPageChrome(pane); -} - -pub fn isSectionsOutput(pane: *const pardes.Pane) bool { - if (comptime !enabled) return false; - const file = pane.file orelse return false; - const output = file.output orelse return false; - return switch (output.from) { - .cmd => |builtin| builtin == .PdfSections, - else => false, - }; -} - -/// Refresh the exact generated outline buffer owned by this document. Content -/// revision is the ownership boundary: once a user edits it, live reload must -/// never overwrite it even if the slot and origin still look familiar. -fn refreshCleanSections(core: *pardes.Pardes, state: *State) void { - if (comptime !enabled) return; - const remembered = state.sections_output orelse return; - if (remembered.pane >= core.panes.len) return; - const result = core.panes[remembered.pane] orelse return; - if (result.serial != remembered.serial or !isSectionsOutput(result)) return; - const file = &result.file.?; - if (file.revision != remembered.revision) return; - - const content = state.renderSections(core.pdf_gpa, core.gpa) catch { - state.sections_output = null; - return; - }; - if (std.mem.eql(u8, file.content, content)) { - core.gpa.free(content); - return; - } - core.invalidateLookHover(remembered.pane); - file_pane.setContent(core, file, content); - const rows = file_pane.lineCount(file.content); - file.scroll = @min(file.scroll, rows - 1); - const row = @min(@as(usize, @intCast(@max(0, result.cur_row))), rows - 1); - result.cur_row = @intCast(row); - result.cur_col = @intCast(@min( - @as(usize, @intCast(@max(0, result.cur_col))), - modal.lineSlice(file.content, row).len, - )); - result.msel.active = false; - result.vsel.active = false; - result.nsel = 0; - state.sections_output.?.revision = file.revision; -} - -/// One successful watched-path transaction, including every piece of derived -/// PDF output. The caller owns generic update bookkeeping and status text. -pub fn reloadWatched( - core: *pardes.Pardes, - pane: *pardes.Pane, -) !void { - try reloadPane(core, pane); - refreshCleanSections(core, &pane.pdf.?); -} - -fn rearmCleanSections( - core: *pardes.Pardes, - id: usize, - pane: *pardes.Pane, - state: *State, -) bool { - const remembered = state.sections_output orelse return false; - if (remembered.pane >= core.panes.len) return false; - const result = core.panes[remembered.pane] orelse return false; - if (result.serial != remembered.serial or !isSectionsOutput(result)) return false; - const file = &result.file.?; - if (file.revision != remembered.revision) return false; - - file.scroll = 0; - result.cur_row = 0; - result.cur_col = 0; - result.msel.active = false; - result.vsel.active = false; - result.nsel = 0; - pane.search_pane = remembered.pane; - pane.search_row = null; - core.armLookWalk(remembered.pane); - core.active = id; - return true; -} - -/// Lazily materialise this pane's cached outline as a location list. All -/// PDF-specific ownership stays here; Pardes contributes only placement. -pub fn openSections(core: *pardes.Pardes, id: usize) void { - if (comptime !enabled) return; - const pane = core.panes[id] orelse return; - const state = &(pane.pdf orelse return); - if (rearmCleanSections(core, id, pane, state)) return; - const content = state.renderSections(core.pdf_gpa, core.gpa) catch return; - - const free = core.freeSlot() orelse { - core.gpa.free(content); - return; - }; - const dir = std.fs.path.dirname(state.path) orelse "/"; - const result = output_pane.open( - core, - free, - dir, - .{ .cmd = .PdfSections }, - "", - content, - ) catch { - core.gpa.free(content); - return; - }; - state.sections_output = .{ - .pane = free, - .serial = result.serial, - .revision = result.file.?.revision, - }; - core.placeDoc(id, free, result); - core.computeGeom(); - core.active = id; - pane.search_pane = free; - pane.search_row = null; - core.armLookWalk(free); -} - -const SectionsOwner = struct { - id: usize, - pane: *pardes.Pane, - state: *State, -}; - -/// Reverse the state-side ownership token. Merely having +PdfSections origin -/// is insufficient: an output may outlive its document, and duplicate panes -/// may legitimately have the same pathname. -fn sectionsOwner(core: *pardes.Pardes, output_id: usize) ?SectionsOwner { - const output = core.panes[output_id] orelse return null; - if (!isSectionsOutput(output)) return null; - const file = output.file.?; - for (core.panes, 0..) |slot, id| { - const pane = slot orelse continue; - const state = if (pane.pdf) |*pdf_state| pdf_state else continue; - const token = state.sections_output orelse continue; - if (token.pane == output_id and token.serial == output.serial and - token.revision == file.revision) - return .{ .id = id, .pane = pane, .state = state }; - } - return null; -} - -/// Interpret the ordinal column used only by a live, exact +PdfSections -/// output. Stale/orphaned outputs are consumed inertly rather than resolving -/// their old ordinal against a different document generation. -pub fn lookSection( - core: *pardes.Pardes, - output_id: usize, - path: []const u8, - at: look.Spot, -) bool { - if (comptime !enabled) return false; - const output = core.panes[output_id] orelse return false; - if (!isSectionsOutput(output)) return false; - if (at.line == 0 or at.col == 0 or at.end_line != 0 or - !look.isPdfPath(path)) return false; - const owner = sectionsOwner(core, output_id) orelse return true; - - var joined_path: [4096]u8 = undefined; - const output_dir = std.fs.path.dirname(output.file.?.path) orelse "/"; - const separator = if (std.mem.endsWith(u8, output_dir, "/")) "" else "/"; - const target_path = if (std.fs.path.isAbsolute(path)) - path - else - std.fmt.bufPrint(&joined_path, "{s}{s}{s}", .{ output_dir, separator, path }) catch return true; - if (!std.mem.eql(u8, owner.state.path, target_path)) return true; - - const destination = owner.state.sectionDestination(core.pdf_gpa, at.col - 1) orelse return true; - switch (destination) { - .internal => |internal| revealOutlineDestination(core, owner.pane, internal), - .external => |uri| if (uri.len <= 256) core.emit(.{ .open_link = .from(uri) }), - .none => unreachable, - } - core.active = owner.id; - return true; -} - -pub fn resetPageChrome(pane: *pardes.Pane) void { - pane.cur_row = 0; - pane.cur_col = 0; - pane.vsel.active = false; - pane.msel.active = false; - pane.nsel = 0; -} - -pub fn activatePage( - core: *pardes.Pardes, - pane: *pardes.Pane, - page: usize, - reveal: bool, -) void { - if (comptime !enabled) return; - const state = &(pane.pdf orelse return); - if (state.activatePage(core.pdf_gpa, page, reveal)) resetPageChrome(pane); -} - -pub fn revealOutlineDestination( - core: *pardes.Pardes, - pane: *pardes.Pane, - destination: OutlineInternalDestination, -) void { - if (comptime !enabled) return; - activatePage(core, pane, destination.page, false); - const state = &pane.pdf.?; - state.queueOutlineReveal(destination); - // Consume immediately when geometry already exists; otherwise the PDF - // draw pass consumes the same value after the next layout transaction. - _ = ensurePaneLayout(core, pane); -} - -pub fn setPage(core: *pardes.Pardes, pane: *pardes.Pane, page: usize) void { - activatePage(core, pane, page, true); -} - -pub fn toggleFit(pane: *pardes.Pane) void { - if (comptime !enabled) return; - const state = &(pane.pdf orelse return); - state.toggleFit(); -} - -pub fn toggleTint(pane: *pardes.Pane) void { - if (comptime !enabled) return; - const state = &(pane.pdf orelse return); - state.toggleTint(); -} - -pub fn stepPanePage(core: *pardes.Pardes, pane: *pardes.Pane, delta: i64) void { - if (comptime !enabled) return; - const state = &(pane.pdf orelse return); - if (stepPage(state, core.pdf_gpa, delta)) resetPageChrome(pane); -} - -pub fn paneViewport(core: *const pardes.Pardes, pane: *const pardes.Pane) ?Viewport { - if (comptime !enabled) return null; - const rect = for (core.panes, 0..) |slot, id| { - if (slot == pane) break core.rects[id]; - } else return null; - const cols = rect.w -| config.GUTTER; - const rows = rect.h -| pardes.BOX_H; - if (cols == 0 or rows == 0) return null; - return .{ - .pixel_w = @as(u32, cols) * @as(u32, core.cell_pixels.w), - .pixel_h = @as(u32, rows) * @as(u32, core.cell_pixels.h), - }; -} - -pub fn ensurePaneLayout(core: *pardes.Pardes, pane: *pardes.Pane) ?Viewport { - if (comptime !enabled) return null; - const state = &(pane.pdf orelse return null); - const view = paneViewport(core, pane) orelse return null; - ensureLayout(state, view); - return view; -} - -pub fn tintColors(core: *const pardes.Pardes) TintColors { - if (comptime !enabled) return; - const theme = core.theme(); - return .{ - .background = theme.bg orelse theme.tag_bg, - .foreground = theme.fg orelse theme.tag_fg, - }; -} - -pub fn paneGeometry(core: *const pardes.Pardes, pane: *const pardes.Pane) ?image.NativeGeometry { - if (comptime !enabled) return null; - const state = if (pane.pdf) |*view| view else return null; - const view = paneViewport(core, pane) orelse return null; - return activeGeometry(state, view); -} - -pub fn pageAtGridRow(core: *const pardes.Pardes, pane: *const pardes.Pane, row: u16) ?usize { - if (comptime !enabled) return null; - const state = pane.pdf orelse return null; - const rect = for (core.panes, 0..) |slot, id| { - if (slot == pane) break core.rects[id]; - } else return null; - const body_y = if (core.settings.tag_bottom) rect.y else rect.y + pardes.BOX_H; - if (row < body_y or row >= body_y + (rect.h -| pardes.BOX_H)) return null; - const local_y = @as(f64, @floatFromInt( - @as(u32, row - body_y) * core.cell_pixels.h + core.cell_pixels.h / 2, - )); - return pageAtViewportY(&state, local_y); -} - -pub fn paneNativeReady(core: *const pardes.Pardes, pane: *const pardes.Pane) bool { - if (comptime !enabled) return false; - if (!core.native_images) return false; - const state = if (pane.pdf) |*view| view else return false; - const view = paneViewport(core, pane) orelse return false; - return nativeReady(state, view); -} - -pub fn nativePageAtGridRow( - core: *const pardes.Pardes, - pane: *const pardes.Pane, - row: u16, -) ?usize { - if (comptime !enabled) return null; - if (!core.native_images) return null; - const state = if (pane.pdf) |*view| view else return null; - const page = pageAtGridRow(core, pane, row) orelse return null; - const view = paneViewport(core, pane) orelse return null; - if (!pageReady(state, view, page)) return null; - return page; -} - -pub fn pointAt( - core: *const pardes.Pardes, - pane: *const pardes.Pane, - col: u16, - row: u16, - clamp_to_page: bool, -) ?Point { - if (comptime !enabled) return null; - const state = pane.pdf orelse return null; - return panePointAtPage(core, pane, state.page, col, row, clamp_to_page); -} - -pub fn panePointAtPage( - core: *const pardes.Pardes, - pane: *const pardes.Pane, - page: usize, - col: u16, - row: u16, - clamp_to_page: bool, -) ?Point { - if (comptime !enabled) return null; - const state = if (pane.pdf) |*view| view else return null; - const view = paneViewport(core, pane) orelse return null; - const rect = for (core.panes, 0..) |slot, id| { - if (slot == pane) break core.rects[id]; - } else return null; - const body_x = @as(i64, rect.x + config.GUTTER); - const body_y = @as(i64, if (core.settings.tag_bottom) rect.y else rect.y + pardes.BOX_H); - const px = (@as(i64, col) - body_x) * core.cell_pixels.w + core.cell_pixels.w / 2; - const py = (@as(i64, row) - body_y) * core.cell_pixels.h + core.cell_pixels.h / 2; - return pointAtPage(state, view, page, px, py, clamp_to_page); -} - -pub fn probeAt( - core: *pardes.Pardes, - pane: *pardes.Pane, - col: u16, - row: u16, -) ?WordProbe { - if (comptime !enabled) return null; - const page = nativePageAtGridRow(core, pane, row) orelse return null; - const point = panePointAtPage(core, pane, page, col, row, false) orelse return null; - const state = &(pane.pdf orelse return null); - return probeWord(&state.document, core.pdf_gpa, page, point) catch null; -} - -pub fn beginDrag( - core: *pardes.Pardes, - pane: *pardes.Pane, - col: u16, - row: u16, - snap_word: bool, -) bool { - if (comptime !enabled) return false; - const hit_page = pageAtGridRow(core, pane, row) orelse return false; - if (hit_page != pane.pdf.?.page) activatePage(core, pane, hit_page, false); - const state = &pane.pdf.?; - state.clearDrag(); - const point = pointAt(core, pane, col, row, false) orelse return false; - state.drag_anchor = point; - state.drag_head = point; - if (!snap_word) return true; - if (state.selection) |selection| if (selection.contains(point)) return true; - if (state.setSelection(core.pdf_gpa, point, point, true) == .failed) { - // Preserve the old selection transactionally, but never let an - // outside click execute its stale text. - state.clearDrag(); - return false; - } - return true; -} - -pub fn beginSelection( - core: *pardes.Pardes, - pane: *pardes.Pane, - col: u16, - row: u16, -) bool { - return beginDrag(core, pane, col, row, true); -} - -pub fn updateSelection( - core: *pardes.Pardes, - pane: *pardes.Pane, - col: u16, - row: u16, - invalidate_raster: bool, -) SelectionUpdate { - if (comptime !enabled) return .failed; - const state = &(pane.pdf orelse return .failed); - const anchor = state.drag_anchor orelse return .failed; - const point = pointAt(core, pane, col, row, true) orelse return .failed; - if (state.drag_head) |head| if (head.x == point.x and head.y == point.y) return .stationary; - const result = state.setSelection(core.pdf_gpa, anchor, point, invalidate_raster); - if (result != .failed) state.drag_head = point; - return result; -} - -/// Begin the native portion of a generic pointer gesture. Tag clicks and PDF -/// panes without a presentable raster remain ordinary grid gestures. A Look -/// click defers its side-effect-free word probe until release; select/Exec -/// establish the persistent selection transaction immediately. -pub fn pointerStart( - core: *pardes.Pardes, - pane: *pardes.Pane, - button: pardes.Mouse.Button, - col: u16, - row: u16, - on_tag: bool, -) PointerDrag { - if (comptime !enabled) return .{}; - if (on_tag or !paneNativeReady(core, pane)) return .{}; - var drag: PointerDrag = .{ .native = true }; - if (button == config.look_button) { - drag.word_at = .{ .col = col, .row = row }; - } else if (button == config.select_button) { - _ = beginDrag(core, pane, col, row, false); - } else if (button == config.exec_button) { - _ = beginDrag(core, pane, col, row, true); - } - return drag; -} - -/// Advance selection state without baking a new raster. A right-click stays a -/// pure word probe until it crosses into a second grid cell; at that point it -/// becomes the same native selection drag as Exec. -pub fn pointerUpdate( - drag: *PointerDrag, - core: *pardes.Pardes, - pane: *pardes.Pane, - col: u16, - row: u16, -) void { - if (comptime !enabled) return; - if (!drag.native) return; - if (drag.word_at) |at| { - if (col == at.col and row == at.row) return; - if (!beginDrag(core, pane, at.col, at.row, false)) { - drag.word_at = null; - return; - } - switch (updateSelection(core, pane, col, row, false)) { - .failed => { - drag.word_at = null; - pane.pdf.?.clearDrag(); - }, - // Adjacent grid cells can still address one raster pixel. Keep - // click mode and retry farther out. - .stationary => {}, - .unchanged => drag.word_at = null, - .changed => { - drag.word_at = null; - drag.selection_changed = true; - }, - } - return; - } - switch (updateSelection(core, pane, col, row, false)) { - .failed => pane.pdf.?.clearDrag(), - .stationary, .unchanged => {}, - .changed => drag.selection_changed = true, - } -} - -/// Cancel a native gesture before release (the acme 2-3 / 3-2 chord). Word -/// probes own nothing until release; changed selections still need their one -/// raster commit before their transient anchors are dropped. -pub fn pointerCancel(pane: *pardes.Pane, drag: PointerDrag) void { - if (comptime !enabled) return; - if (drag.native) if (pane.pdf) |*state| { - if (drag.selection_changed) state.invalidateRaster(state.page); - state.clearDrag(); - }; -} - -/// Finalize every pane mutation before returning command work to the core. -/// The caller may dispatch `action` immediately and then call deinit; no path -/// after this function needs the source pane to remain alive. -pub fn pointerRelease( - core: *pardes.Pardes, - pane: *pardes.Pane, - drag: PointerDrag, - button: pardes.Mouse.Button, - chorded: bool, -) PointerRelease { - if (comptime !enabled) return .{}; - const state = &(pane.pdf orelse return .{}); - const slot = @intFromEnum(button); - const grid_selection = pane.sel[slot]; - pane.sel[slot].state = .none; // native quads, not projected text cells - - // Drag updates changed live geometry/text while leaving baked pixels - // stable. Commit exactly once before any chord/Exec/Look can clear state. - if (drag.selection_changed) state.invalidateRaster(state.page); - if (chorded) { - state.clearDrag(); - return .{}; - } - if (drag.word_at) |at| { - const maybe_probe = probeAt(core, pane, at.col, at.row); - state.clearDrag(); - const probe = maybe_probe orelse return .{}; - // A neighboring visible page becomes current before Look dispatch. - // WordProbe owns its text/quads independently of that state change. - if (probe.page != state.page) activatePage(core, pane, probe.page, false); - const text = probe.text; - return .{ .action = .look, .text = text, .probe = probe }; - } - if (button == config.select_button) { - const dragged = grid_selection.c0 != grid_selection.c1 or - grid_selection.r0 != grid_selection.r1; - if (!dragged) state.clearSelection(core.pdf_gpa); - pane.cur_pinned = true; - pane.mode = .normal; - pane.msel.active = false; - pane.vsel.active = false; - pane.pending = 0; - pane.nsel = 0; - state.clearDrag(); - return .{}; - } - if (state.drag_anchor == null or state.selection_text.len == 0) { - state.clearDrag(); - return .{}; - } - const text = state.selection_text; - state.clearDrag(); - return .{ - .action = if (button == config.look_button) .look else .exec, - .text = text, - }; -} - -pub fn highlightInput( - core: *pardes.Pardes, - pane_id: usize, - pane: *const pardes.Pane, -) HighlightInput { - if (comptime !enabled) return; - const hover_quads: []const Quad = if (core.pdf_hover_preview) |preview| - if (preview.pane == pane_id and preview.serial == pane.serial) - preview.probe.quads - else - &.{} - else - &.{}; - const hover_page = if (hover_quads.len > 0) core.pdf_hover_preview.?.probe.page else null; - const selection_color = core.theme().sel_bg; - return .{ - .hover_quads = hover_quads, - .hover_page = hover_page, - .hover_color = selection_color, - .selection_color = selection_color, - }; -} - -pub fn panPane( - core: *pardes.Pardes, - pane: *pardes.Pane, - axis: PanAxis, - direction: i8, - display_pixels: u32, -) PanResult { - if (comptime !enabled) return .unavailable; - const placed = paneGeometry(core, pane) orelse return .unavailable; - const state = &(pane.pdf orelse return .unavailable); - return panPixels(state, placed, axis, direction, display_pixels); -} - -pub fn scrollPane(core: *pardes.Pardes, pane: *pardes.Pane, delta_pixels: f64) bool { - if (comptime !enabled) return false; - const tz = tracy.zone(@src(), "pdf.scroll_notch"); - defer tz.end(); - const state = &(pane.pdf orelse return false); - const view = ensurePaneLayout(core, pane) orelse return false; - const result = scrollDocument(state, view, delta_pixels) orelse return false; - if (result.active_page != state.page) activatePage(core, pane, result.active_page, false); - return true; -} - -pub fn verticalWheel(core: *pardes.Pardes, pane: *pardes.Pane, direction: i8) void { - if (comptime !enabled) return; - if (!core.native_images) return stepPanePage(core, pane, direction); - const rows: u32 = @intCast(@max(1, config.wheel_rows)); - const pixels = scaledStep(core.cell_pixels.h, rows); - _ = scrollPane(core, pane, @as(f64, @floatFromInt(pixels)) * direction); -} - -pub fn horizontalWheel(core: *pardes.Pardes, pane: *pardes.Pane, direction: i8) void { - if (comptime !enabled) return; - const state = pane.pdf orelse return; - if (!core.native_images or state.fit != .height) return; - const cols: u32 = @intCast(@max(1, config.wheel_cols)); - _ = panPane(core, pane, .horizontal, direction, scaledStep(core.cell_pixels.w, cols)); -} - -/// Render every visible page attachment and the PDF-owned scrollbar. The -/// canonical text body remains the core's fallback when native pixels are -/// unavailable, so false means renderPane should continue normally. -pub fn draw( - core: *pardes.Pardes, - pane: *pardes.Pane, - rect: pardes.Rect, - pane_id: usize, - text_x: u16, - text_width: u16, -) bool { - if (comptime !enabled) return false; - if (!core.native_images or rect.h <= pardes.BOX_H) return false; - const state = &(pane.pdf orelse return false); - const view = paneViewport(core, pane) orelse return false; - const key = TintKey{ .mode = state.tint, .colors = tintColors(core) }; - const visible = renderFrame( - state, - core.pdf_gpa, - core.scratch.allocator(), - view, - pardes.pdf_raster_policy, - key, - highlightInput(core, pane_id, pane), - ); - var placed_any = false; - var page = visible.first; - const visible_end = visible.first + visible.len; - while (page < visible_end) : (page += 1) { - const placed = placedRaster(state, view, page) orelse continue; - if (!core.appendImagePlace(.{ - .pane = @intCast(pane_id), - .serial = pane.serial, - .native = .{ - .revision = placed.revision, - .page = @intCast(placed.page), - .fit = switch (placed.fit) { - .width => .width, - .height => .height, - }, - .pan_x = placed.pan_x, - .geometry = placed.geometry, - .pixel_offset_y = placed.pixel_offset_y, - }, - .x = text_x, - .y = if (core.settings.tag_bottom) rect.y else rect.y + pardes.BOX_H, - .w = text_width, - .h = rect.h - pardes.BOX_H, - .rgba = placed.rgba, - .iw = placed.width, - // The texture contains the retained band, not the full page. - .ih = placed.band_height, - })) break; - placed_any = true; - } - if (!placed_any) return false; - - // This frame has spent the motion used to choose its raster band. - state.scroll_travel = 0; - const body_y = if (core.settings.tag_bottom) rect.y else rect.y + pardes.BOX_H; - const chrome = core.chromeTheme(); - const theme = core.theme(); - const pane_bg: pardes.Color = if (theme.bg) |color| .{ .rgb = color } else .default; - core.surface.fill(rect.x, body_y, 1, rect.h -| pardes.BOX_H, .{ .bg = .{ .rgb = chrome.scroll_track } }); - core.surface.fill(rect.x + 1, body_y, 1, rect.h -| pardes.BOX_H, .{ .bg = pane_bg }); - - const track_h: usize = rect.h - pardes.BOX_H; - const total = @max(@as(u64, 1), state.document_height); - const len = @max( - @as(usize, 1), - @as(usize, @intCast(@min( - @as(u64, track_h), - @as(u64, track_h) * view.pixel_h / total, - ))), - ); - const offset: u64 = @intFromFloat(@floor(state.document_scroll_y)); - const pos: usize = @intCast(@min( - @as(u64, track_h -| 1), - @as(u64, track_h) * offset / total, - )); - var y = pos; - while (y < track_h and y < pos + len) : (y += 1) - core.surface.fill( - rect.x, - body_y + @as(u16, @intCast(y)), - 1, - 1, - .{ .bg = .{ .rgb = chrome.scroll_thumb } }, - ); - return true; -} - -pub const SectionRows = if (enabled) struct { - pub fn usableDestination(destination: pdf.OutlineDestination) ?pdf.OutlineDestination { - return switch (destination) { - .internal => destination, - .external => |uri| if (safeHttpUri(uri)) destination else null, - .none => null, - }; - } - - fn safeHttpUri(uri: []const u8) bool { - // Effect.open_link is inline and cannot carry a larger URL. Omitting - // it here is preferable to rendering a row which can never act. - if (uri.len > 256) return false; - var has_scheme = false; - for (config.url_schemes) |scheme| { - if (std.mem.startsWith(u8, uri, scheme)) { - has_scheme = true; - break; - } - } - if (!has_scheme) return false; - for (uri) |byte| if (byte <= 0x20 or byte == 0x7f) return false; - return true; - } - - /// A structural node goes to the first later DFS entry still below it - /// which carries a usable destination. Nodes with their own unusable URI - /// are not structural: omit them instead of silently changing their link. - pub fn resolve(entries: []const pdf.OutlineEntry, ordinal: usize) ?pdf.OutlineDestination { - if (ordinal >= entries.len) return null; - const entry = entries[ordinal]; - if (entry.destination != .none) return usableDestination(entry.destination); - var i = ordinal + 1; - while (i < entries.len and entries[i].depth > entry.depth) : (i += 1) - if (usableDestination(entries[i].destination)) |destination| return destination; - return null; - } - - /// Resolve every rendered row in one DFS pass. `resolve` above stays the - /// public single-ordinal policy used by Look; bulk materialisation avoids - /// rescanning the same descendant chain for every structural ancestor. - /// The one-usize-per-entry table is transient (64 KiB at MuPDF's 8192 - /// outline-item limit) and stores source ordinals, so URI slices continue - /// to borrow from the document-owned outline instead of being copied. - pub fn resolveOrdinals( - gpa: std.mem.Allocator, - entries: []const pdf.OutlineEntry, - ) ![]usize { - const unresolved = std.math.maxInt(usize); - const ordinals = try gpa.alloc(usize, entries.len); - @memset(ordinals, unresolved); - - const Pending = struct { depth: u8, ordinal: usize }; - // OutlineEntry.depth is u8. A valid DFS path therefore cannot hold - // more than 256 simultaneously unresolved ancestors, independent of - // the tighter limit enforced by the MuPDF bridge. - var pending: [256]Pending = undefined; - var pending_len: usize = 0; - for (entries, 0..) |entry, ordinal| { - while (pending_len > 0 and pending[pending_len - 1].depth >= entry.depth) - pending_len -= 1; - - if (usableDestination(entry.destination) != null) { - ordinals[ordinal] = ordinal; - for (pending[0..pending_len]) |ancestor| - ordinals[ancestor.ordinal] = ordinal; - pending_len = 0; - } else if (entry.destination == .none) { - pending[pending_len] = .{ .depth = entry.depth, .ordinal = ordinal }; - pending_len += 1; - } - } - return ordinals; - } - - fn cleanTitle(out: ?[]u8, title: ?[]const u8) usize { - const raw = title orelse { - if (out) |buf| @memcpy(buf[0..10], "[untitled]"); - return 10; - }; - var at: usize = 0; - var i: usize = 0; - var wrote = false; - var pending_space = false; - while (i < raw.len) { - const n: usize = std.unicode.utf8ByteSequenceLength(raw[i]) catch { - pending_space = wrote; - i += 1; - continue; - }; - if (i + n > raw.len) { - pending_space = wrote; - break; - } - const cp = std.unicode.utf8Decode(raw[i .. i + n]) catch { - pending_space = wrote; - i += n; - continue; - }; - const whitespace_or_control = cp <= 0x20 or cp == 0x7f or - (cp >= 0x80 and cp <= 0x9f) or cp == 0x2028 or cp == 0x2029; - if (whitespace_or_control) { - pending_space = wrote; - } else { - if (pending_space) { - if (out) |buf| buf[at] = ' '; - at += 1; - } - if (out) |buf| @memcpy(buf[at..][0..n], raw[i .. i + n]); - at += n; - wrote = true; - pending_space = false; - } - i += n; - } - if (!wrote) { - if (out) |buf| @memcpy(buf[0..13], "[empty title]"); - return 13; - } - return at; - } - - pub fn render(gpa: std.mem.Allocator, path: []const u8, entries: []const pdf.OutlineEntry) ![]u8 { - const target = std.fs.path.basename(path); - const ordinals = try resolveOrdinals(gpa, entries); - defer gpa.free(ordinals); - var total: usize = 0; - for (entries, 0..) |entry, ordinal| { - const resolved = ordinals[ordinal]; - if (resolved == std.math.maxInt(usize)) continue; - const destination = usableDestination(entries[resolved].destination) orelse unreachable; - total += switch (destination) { - .internal => |internal| std.fmt.count("{s}:{d}:{d} ", .{ target, internal.page + 1, ordinal + 1 }), - .external => |uri| std.fmt.count("{s} ", .{uri}), - .none => unreachable, - }; - total += @as(usize, entry.depth) * 2 + cleanTitle(null, entry.title) + 1; - } - const out = try gpa.alloc(u8, total); - errdefer gpa.free(out); - var at: usize = 0; - for (entries, 0..) |entry, ordinal| { - const resolved = ordinals[ordinal]; - if (resolved == std.math.maxInt(usize)) continue; - const destination = usableDestination(entries[resolved].destination) orelse unreachable; - const prefix = switch (destination) { - .internal => |internal| try std.fmt.bufPrint(out[at..], "{s}:{d}:{d} ", .{ target, internal.page + 1, ordinal + 1 }), - .external => |uri| try std.fmt.bufPrint(out[at..], "{s} ", .{uri}), - .none => unreachable, - }; - at += prefix.len; - const indent = @as(usize, entry.depth) * 2; - @memset(out[at..][0..indent], ' '); - at += indent; - at += cleanTitle(out[at..], entry.title); - out[at] = '\n'; - at += 1; - } - return out; - } -} else struct {}; - -test "PDF section rows preserve DFS ordinals and sanitise hierarchy" { - if (!enabled) return; - const entries = [_]pdf.OutlineEntry{ - .{ .depth = 0, .title = null, .is_open = true, .flags = 0, .color = @splat(0), .destination = .none }, - .{ .depth = 1, .title = " Child\n\tTitle\x01 Café \u{2028} Next ", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .internal = .{ .page = 2, .x = 12, .y = 34 } } }, - .{ .depth = 0, .title = "", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .internal = .{ .page = 0, .x = null, .y = null } } }, - .{ .depth = 0, .title = "External", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .external = "https://example.com/manual" } }, - .{ .depth = 0, .title = "Dead branch", .is_open = false, .flags = 0, .color = @splat(0), .destination = .none }, - .{ .depth = 0, .title = "Unsafe", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .external = "javascript:alert" } }, - .{ .depth = 0, .title = "Linked branch", .is_open = true, .flags = 0, .color = @splat(0), .destination = .none }, - .{ .depth = 1, .title = "Deep link", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .external = "https://example.com/deep" } }, - }; - const rows = try SectionRows.render(std.testing.allocator, "/tmp/manual.pdf", &entries); - defer std.testing.allocator.free(rows); - try std.testing.expectEqualStrings( - "manual.pdf:3:1 [untitled]\n" ++ - "manual.pdf:3:2 Child Title Café Next\n" ++ - "manual.pdf:1:3 [empty title]\n" ++ - "https://example.com/manual External\n" ++ - "https://example.com/deep Linked branch\n" ++ - "https://example.com/deep Deep link\n", - rows, - ); - try std.testing.expect(SectionRows.resolve(&entries, 4) == null); - try std.testing.expect(SectionRows.resolve(&entries, 5) == null); - const resolved = try SectionRows.resolveOrdinals(std.testing.allocator, &entries); - defer std.testing.allocator.free(resolved); - for (entries, 0..) |_, ordinal| { - const single = SectionRows.resolve(&entries, ordinal); - if (resolved[ordinal] == std.math.maxInt(usize)) { - try std.testing.expect(single == null); - } else { - const bulk = SectionRows.usableDestination(entries[resolved[ordinal]].destination) orelse - return error.MissingBulkPdfSectionDestination; - try std.testing.expect(single != null); - try std.testing.expect(std.meta.eql(single.?, bulk)); - } - } - - // Every allocation site in the ordinal table and output growth remains - // atomic: the testing allocator sees each induced failure cleaned up - // before the first index at which the whole render can succeed. - var rendered = false; - for (0..64) |fail_index| { - var failing = std.testing.FailingAllocator.init(std.testing.allocator, .{ - .fail_index = fail_index, - }); - const failure_gpa = failing.allocator(); - const attempt = SectionRows.render(failure_gpa, "/tmp/manual.pdf", &entries) catch |err| { - try std.testing.expectEqual(error.OutOfMemory, err); - continue; - }; - failure_gpa.free(attempt); - rendered = true; - break; - } - try std.testing.expect(rendered); -} - -test "bulk PDF section resolution matches single Look policy across DFS boundaries" { - if (!enabled) return; - const entries = [_]pdf.OutlineEntry{ - .{ .depth = 0, .title = "Resolved root", .is_open = true, .flags = 0, .color = @splat(0), .destination = .none }, - .{ .depth = 1, .title = "Unsafe branch", .is_open = true, .flags = 0, .color = @splat(0), .destination = .{ .external = "javascript:unsafe" } }, - .{ .depth = 2, .title = "Safe grandchild", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .internal = .{ .page = 1, .x = 4, .y = 8 } } }, - .{ .depth = 1, .title = "Unresolved child", .is_open = false, .flags = 0, .color = @splat(0), .destination = .none }, - .{ .depth = 1, .title = "Sibling", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .internal = .{ .page = 2, .x = null, .y = null } } }, - .{ .depth = 0, .title = "Unresolved root", .is_open = false, .flags = 0, .color = @splat(0), .destination = .none }, - .{ .depth = 0, .title = "Next root", .is_open = false, .flags = 0, .color = @splat(0), .destination = .{ .internal = .{ .page = 3, .x = null, .y = null } } }, - }; - const bulk = try SectionRows.resolveOrdinals(std.testing.allocator, &entries); - defer std.testing.allocator.free(bulk); - const none = std.math.maxInt(usize); - try std.testing.expectEqualSlices(usize, &.{ 2, none, 2, none, 4, none, 6 }, bulk); - for (entries, 0..) |_, ordinal| { - const single = SectionRows.resolve(&entries, ordinal); - if (bulk[ordinal] == none) { - try std.testing.expect(single == null); - } else { - const destination = SectionRows.usableDestination(entries[bulk[ordinal]].destination) orelse - return error.MissingBoundaryPdfSectionDestination; - try std.testing.expect(single != null); - try std.testing.expect(std.meta.eql(single.?, destination)); - } - } -} - -test "PDF word probe owns quads and text without a selection object" { - if (comptime !enabled) return; - var document = try Document.open("docs/design.pdf"); - defer document.deinit(); - var found = try document.search(std.testing.allocator, 0, "Pardes"); - defer found.deinit(std.testing.allocator); - const quad = found.quads[0].quad; - const point = Point{ - .x = (quad.ul.x + quad.ur.x + quad.ll.x + quad.lr.x) / 4, - .y = (quad.ul.y + quad.ur.y + quad.ll.y + quad.lr.y) / 4, - }; - - // Exactly one shared probe exercises the primitive used by both UI paths; - // click-vs-hover equivalence belongs to production structure, not a second - // test that can only restate this MuPDF result. - var probe = (try probeWord(&document, std.testing.allocator, 0, point)) orelse - return error.MissingPdfWordProbe; - defer probe.deinit(std.testing.allocator); - try std.testing.expectEqual(@as(usize, 0), probe.page); - try std.testing.expect(probe.quads.len > 0); - try std.testing.expect(std.ascii.indexOfIgnoreCase(probe.text, "Pardes") != null); -} - -test "PDF point mapping restores band origin and fractional placement" { - if (comptime !enabled) return; - const point = pointAtGeometry( - .{ - .src = .{ .x = 20, .y = 10, .w = 40, .h = 20 }, - .dst = .{ .x = 100, .y = 30, .w = 80, .h = 20 }, - }, - -0.5, - 200, - 200, - 80, - 120, - 34, - false, - ) orelse return error.MissingPdfMappedPoint; - // x: src 30; y: band 80 + local src 14. The returned coordinates address - // pixel centers, matching MuPDF's normalized page-space contract. - try std.testing.expectApproxEqAbs(@as(f32, 30.5 / 200.0), point.x, 0.000_001); - try std.testing.expectApproxEqAbs(@as(f32, 94.5 / 200.0), point.y, 0.000_001); -} |