external/pdfium/extractpatterns.patch

--- core/fpdfapi/page/cpdf_pattern.h	2025-10-17 15:44:08.393532043 +0100
+++ core/fpdfapi/page/cpdf_pattern.h	2025-10-17 15:44:12.020459390 +0100
@@ -26,6 +26,7 @@
   virtual CPDF_ShadingPattern* AsShadingPattern();
 
   const CFX_Matrix& pattern_to_form() const { return pattern_to_form_; }
+  RetainPtr<CPDF_Object> pattern_obj() const { return pattern_obj_; }
 
  protected:
   CPDF_Pattern(CPDF_Document* doc,
@@ -35,7 +36,6 @@
 
   // All the getters that return pointers return non-NULL pointers.
   CPDF_Document* document() const { return document_; }
-  RetainPtr<CPDF_Object> pattern_obj() const { return pattern_obj_; }
   const CFX_Matrix& parent_matrix() const { return parent_matrix_; }
 
   void SetPatternToFormMatrix();
--- fpdfsdk/fpdf_edittext.cpp	2025-10-17 15:44:08.410532151 +0100
+++ fpdfsdk/fpdf_edittext.cpp	2025-10-17 15:55:18.804847559 +0100
@@ -13,6 +13,9 @@
 #include "core/fpdfapi/font/cpdf_cidfont.h"
 #include "core/fpdfapi/font/cpdf_font.h"
 #include "core/fpdfapi/page/cpdf_docpagedata.h"
+#include "core/fpdfapi/page/cpdf_form.h"
+#include "core/fpdfapi/page/cpdf_pathobject.h"
+#include "core/fpdfapi/page/cpdf_tilingpattern.h"
 #include "core/fpdfapi/page/cpdf_textobject.h"
 #include "core/fpdfapi/page/cpdf_textstate.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
@@ -834,6 +835,108 @@
   return FPDFBitmapFromCFXDIBitmap(result_bitmap.Leak());
 }
 
+FPDF_BITMAP
+FPDFPageObj_GetRenderedPattern(CPDF_Pattern& pattern,
+                               CPDF_Document& doc,
+                               CPDF_PageObject& pageObj,
+                               CPDF_Page* optional_page) {
+  CPDF_TilingPattern* pTilingPattern = pattern.AsTilingPattern();
+  if (!pTilingPattern)
+      return nullptr;
+  const std::unique_ptr<CPDF_Form> pPatternForm = pTilingPattern->Load(&pageObj);
+  if (!pPatternForm)
+    return nullptr;
+  RetainPtr<const CPDF_Dictionary> pDict = pattern.pattern_obj()->GetDict();
+  CFX_FloatRect pattern_bbox = pDict->GetRectFor("BBox");
+
+  // `rect` has to use integer values. Round up as needed.
+  const FX_RECT rect = pattern_bbox.GetOuterRect();
+  if (rect.IsEmpty())
+    return nullptr;
+
+  auto result_bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+  if (!result_bitmap->Create(rect.Width(), rect.Height(),
+                             FXDIB_Format::kBgra)) {
+    return nullptr;
+  }
+  CFX_FloatRect cell_bbox = pattern.pattern_to_form().TransformRect(pattern_bbox);
+  CFX_FloatRect bitmap_rect(0.0f, 0.0f, rect.Width(), rect.Height());
+  CFX_Matrix mtPattern2Bitmap;
+  mtPattern2Bitmap.MatchRect(bitmap_rect, cell_bbox);
+
+  CFX_DefaultRenderDevice bitmap_device;
+  bitmap_device.AttachWithBackdropAndGroupKnockout(
+      result_bitmap, /*pBackdropBitmap=*/nullptr, /*bGroupKnockout=*/true);
+
+  CPDF_RenderOptions options;
+  if (!pTilingPattern->colored())
+    options.SetColorMode(CPDF_RenderOptions::kAlpha);
+  options.GetOptions().bForceHalftone = true;
+
+  CPDF_RenderContext context(&doc, nullptr, nullptr);
+  context.AppendLayer(pPatternForm.get(), mtPattern2Bitmap);
+  context.Render(&bitmap_device, nullptr, &options, nullptr);
+
+  CHECK(!result_bitmap->IsPremultiplied());
+
+  // Caller takes ownership.
+  return FPDFBitmapFromCFXDIBitmap(result_bitmap.Leak());
+}
+
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV
+FPDFPageObj_GetRenderedStrokePattern(FPDF_DOCUMENT document,
+                                     FPDF_PAGE page,
+                                     FPDF_PAGEOBJECT page_object) {
+  CPDF_Document* doc = CPDFDocumentFromFPDFDocument(document);
+  if (!doc)
+    return nullptr;
+
+  CPDF_Page* optional_page = CPDFPageFromFPDFPage(page);
+  if (optional_page && optional_page->GetDocument() != doc)
+    return nullptr;
+
+  CPDF_PageObject* object = CPDFPageObjectFromFPDFPageObject(page_object);
+  if (!object)
+    return nullptr;
+
+  const CPDF_Color* stroke = object->color_state().GetStrokeColor();
+  if (!stroke || !stroke->IsPattern())
+    return nullptr;
+
+  RetainPtr<CPDF_Pattern> pattern = stroke->GetPattern();
+  if (!pattern)
+    return nullptr;
+
+  return FPDFPageObj_GetRenderedPattern(*pattern, *doc, *object, optional_page);
+}
+
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV
+FPDFPageObj_GetRenderedFillPattern(FPDF_DOCUMENT document,
+                                   FPDF_PAGE page,
+                                   FPDF_PAGEOBJECT page_object) {
+  CPDF_Document* doc = CPDFDocumentFromFPDFDocument(document);
+  if (!doc)
+    return nullptr;
+
+  CPDF_Page* optional_page = CPDFPageFromFPDFPage(page);
+  if (optional_page && optional_page->GetDocument() != doc)
+    return nullptr;
+
+  CPDF_PageObject* object = CPDFPageObjectFromFPDFPageObject(page_object);
+  if (!object)
+    return nullptr;
+
+  const CPDF_Color* fill = object->color_state().GetFillColor();
+  if (!fill || !fill->IsPattern())
+    return nullptr;
+
+  RetainPtr<CPDF_Pattern> pattern = fill->GetPattern();
+  if (!pattern)
+    return nullptr;
+
+  return FPDFPageObj_GetRenderedPattern(*pattern, *doc, *object, optional_page);
+}
+
 FPDF_EXPORT void FPDF_CALLCONV FPDFFont_Close(FPDF_FONT font) {
   // Take back ownership from caller and release.
   RetainPtr<CPDF_Font>().Unleak(CPDFFontFromFPDFFont(font));
--- public/fpdf_edit.h	2025-10-17 15:44:08.415888612 +0100
+++ public/fpdf_edit.h	2025-10-17 15:44:12.022555158 +0100
@@ -1417,6 +1417,41 @@
                               float scale);
 
 // Experimental API.
+// Get a bitmap rasterization of the stroke pattern of |page object|.
+// To render correctly, the caller must provide the |document| associated with
+// |page_object|. If there is a |page| associated with |page_object|, the
+// caller should provide that as well.  The returned bitmap will be owned by
+// the caller, and FPDFBitmap_Destroy() must be called on the returned bitmap
+// when it is no longer needed.
+//
+//   document     - handle to a document associated with |page_object|.
+//   page         - handle to an optional page associated with |page_object|.
+//   page_object - handle to a page object.
+//
+// Returns the bitmap or NULL if the stroke is not a pattern or on failure.
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV
+FPDFPageObj_GetRenderedStrokePattern(FPDF_DOCUMENT document,
+                                     FPDF_PAGE page,
+                                     FPDF_PAGEOBJECT page_object);
+
+// Get a bitmap rasterization of the fill pattern of |page object|.
+// To render correctly, the caller must provide the |document| associated with
+// |page_object|. If there is a |page| associated with |page_object|, the
+// caller should provide that as well.  The returned bitmap will be owned by
+// the caller, and FPDFBitmap_Destroy() must be called on the returned bitmap
+// when it is no longer needed.
+//
+//   document     - handle to a document associated with |page_object|.
+//   page         - handle to an optional page associated with |page_object|.
+//   page_object - handle to a page object.
+//
+// Returns the bitmap or NULL if the fill is not a pattern or on failure.
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV
+FPDFPageObj_GetRenderedFillPattern(FPDF_DOCUMENT document,
+                                   FPDF_PAGE page,
+                                   FPDF_PAGEOBJECT page_object);
+
+// Experimental API.
 // Get the font of a text object.
 //
 // text - the handle to the text object.