vendor: import KillerPDF 1.7.5 source (GPL-3.0) as the base for MMD PDF

2026-08-27 06:58:22 +02:00
commit 532485a830
577 changed files with 149058 additions and 0 deletions
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+using PdfPigDoc = UglyToad.PdfPig.PdfDocument;
+
+namespace KillerPDF.Services
+{
+    // ============================================================
+    // Image placement extraction for the display dark mode (#135
+    // follow-up: pictures keep their real colors while the page
+    // inverts). Pure functions over an OPEN PdfPig document - the
+    // caller owns the open/dispose, because a held handle on the
+    // temp file would block the save-time file swap.
+    // ============================================================
+    internal static class PdfImages
+    {
+        /// <summary>
+        /// The page's image bounding boxes as fractions of the unrotated page, top-left origin
+        /// (PdfPig reports PDF points, bottom-left origin - the same y-flip the annotation
+        /// pipeline uses). Fractional so one cached set serves every render resolution, and
+        /// computed against the UNROTATED page because the render sites apply the display
+        /// inversion before the pixel-buffer rotation. pageIndex is 0-based (PdfPig is 1-based).
+        /// </summary>
+        internal static BitmapHelpers.FracRect[] GetFracRects(PdfPigDoc doc, int pageIndex)
+        {
+            var page = doc.GetPage(pageIndex + 1);
+            double pw = page.Width, ph = page.Height;
+            if (pw <= 0 || ph <= 0) return [];
+
+            var list = new List<BitmapHelpers.FracRect>();
+            foreach (var img in page.GetImages())
+            {
+                var b = img.BoundingBox;   // Bounds is obsolete in current PdfPig
+                double l = b.Left / pw, r = b.Right / pw;
+                double t = (ph - b.Top) / ph, bo = (ph - b.Bottom) / ph;
+                if (r < l) { var tmp = l; l = r; r = tmp; }
+                if (bo < t) { var tmp = t; t = bo; bo = tmp; }
+                l = Clamp01(l); r = Clamp01(r);
+                t = Clamp01(t); bo = Clamp01(bo);
+                if (r - l <= 0 || bo - t <= 0) continue;   // degenerate or fully off-page
+                list.Add(new BitmapHelpers.FracRect(l, t, r, bo));
+            }
+            return list.ToArray();
+        }
+
+        private static double Clamp01(double v) => v < 0 ? 0 : (v > 1 ? 1 : v);
+    }
+}