render PDFs as a continuous vertical page strip

1 files changed, 16 insertions, 0 deletions

diff --git a/src/pdf.zig b/src/pdf.zig
index b06c85e8..a1c05681 100644
--- a/src/pdf.zig
+++ b/src/pdf.zig
@@ -72,6 +72,11 @@ pub const Render = struct {
     height: usize,
 };
 
+pub const PageSize = struct {
+    width: f32,
+    height: f32,
+};
+
 pub const SearchQuad = struct {
     quad: Quad,
     /// Zero-based logical hit. One hit may have several oriented quads.
@@ -150,6 +155,17 @@ pub const Document = struct {
         document.* = undefined;
     }
 
+    /// Return crop/rotation-aware page dimensions without allocating pixels.
+    pub fn pageSize(document: *Document, page: usize) !PageSize {
+        const page_number = try document.checkedPage(page);
+        var size: c.pardes_pdf_page_size = std.mem.zeroes(c.pardes_pdf_page_size);
+        if (c.pardes_pdf_get_page_size(document.handle, page_number, &size) != c.PARDES_PDF_OK or
+            !std.math.isFinite(size.width) or !std.math.isFinite(size.height) or
+            size.width <= 0 or size.height <= 0)
+            return error.BadPageSize;
+        return .{ .width = size.width, .height = size.height };
+    }
+
     /// Render one zero-based page, bounded before allocation. MuPDF supplies
     /// row-strided RGB; Pardes' attachment boundary is packed straight RGBA.
     pub fn render(document: *Document, gpa: std.mem.Allocator, page: usize) !Render {