svx: support importing forms from PDFs

Still missing the context matrix transformations.

Change-Id: Id9457c6475463127d3bc444f36fa373a6ec8fcb6
(cherry picked from commit 08e2c68e)

external/pdfium/0010-svx-support-importing-forms-from-PDFs.patch.2

+From 636f92aac24f0accfbce910c9153d5479e097e5f Mon Sep 17 00:00:00 2001
+From: Ashod Nakashian <ashod.nakashian@collabora.co.uk>
+Date: Tue, 5 Jun 2018 11:34:38 +0200
+Subject: [PATCH 10/14] svx: support importing forms from PDFs
+
+---
+ pdfium/fpdfsdk/cpdfsdk_helpers.h |  5 +++++
+ pdfium/fpdfsdk/fpdf_editpage.cpp | 30 ++++++++++++++++++++++++++++++
+ pdfium/public/fpdf_edit.h        | 17 +++++++++++++++++
+ 3 files changed, 52 insertions(+)
+
+diff --git a/pdfium/fpdfsdk/cpdfsdk_helpers.h b/pdfium/fpdfsdk/cpdfsdk_helpers.h
+index 13362cf..477bb74 100644
+--- a/pdfium/fpdfsdk/cpdfsdk_helpers.h
++++ b/pdfium/fpdfsdk/cpdfsdk_helpers.h
+@@ -209,6 +209,11 @@ inline CPDF_TextObject* CPDFTextObjectFromFPDFPageObject(
+   return reinterpret_cast<CPDF_TextObject*>(page_object);
+ }
+ 
++inline CPDF_FormObject* CPDFFormObjectFromFPDFPageObject(
++    FPDF_PAGEOBJECT page_object) {
++  return reinterpret_cast<CPDF_FormObject*>(page_object);
++}
++
+ ByteString CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string);
+ 
+ #ifdef PDF_ENABLE_XFA
+diff --git a/pdfium/fpdfsdk/fpdf_editpage.cpp b/pdfium/fpdfsdk/fpdf_editpage.cpp
+index 9c353a4..bf68250 100644
+--- a/pdfium/fpdfsdk/fpdf_editpage.cpp
++++ b/pdfium/fpdfsdk/fpdf_editpage.cpp
+@@ -780,3 +780,33 @@ FPDFTextObj_GetColor(FPDF_PAGEOBJECT text_object,
+ 
+   return true;
+ }
++
++FPDF_EXPORT int FPDF_CALLCONV
++FPDFFormObj_CountSubObjects(FPDF_PAGEOBJECT form_object)
++{
++  CPDF_FormObject* pFrmObj = CPDFFormObjectFromFPDFPageObject(form_object);
++  if (pFrmObj)
++  {
++    const CPDF_PageObjectList* pObjectList = pFrmObj->form()->GetPageObjectList();
++    if (pObjectList)
++        return pObjectList->size();
++  }
++
++  return 0;
++}
++
++FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
++FPDFFormObj_GetSubObject(FPDF_PAGEOBJECT form_object, int index)
++{
++  CPDF_FormObject* pFrmObj = CPDFFormObjectFromFPDFPageObject(form_object);
++  if (pFrmObj)
++  {
++    const CFX_Matrix& matrix = pFrmObj->form_matrix();
++    fprintf(stderr, "Form matrix a: %f, b: %f, c: %f, d: %f, e: %f, f: %f\n", matrix.a, matrix.b, matrix.c, matrix.d, matrix.e, matrix.f);
++    const CPDF_PageObjectList* pObjectList = pFrmObj->form()->GetPageObjectList();
++    if (pObjectList)
++        return pObjectList->GetPageObjectByIndex(index);
++  }
++
++  return nullptr;
++}
+diff --git a/pdfium/public/fpdf_edit.h b/pdfium/public/fpdf_edit.h
+index 4264ccd..ca76954 100644
+--- a/pdfium/public/fpdf_edit.h
++++ b/pdfium/public/fpdf_edit.h
+@@ -1081,6 +1081,23 @@ FPDFTextObj_GetColor(FPDF_PAGEOBJECT text_object,
+                      unsigned int* B,
+                      unsigned int* A);
+ 
++// Get number of page objects inside the form object.
++//
++// form_object - Handle to a form object. Returned by FPDFPage_GetObject.
++// Return value:
++// The number of the page objects.
++FPDF_EXPORT int FPDF_CALLCONV
++FPDFFormObj_CountSubObjects(FPDF_PAGEOBJECT form_object);
++
++// Get the page object from a form object.
++//
++// form_object - Handle to a form object. Returned by FPDFPage_GetObject.
++// index - The index of a page object.
++// Return value:
++// The handle of the page object. Null for failed.
++FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
++FPDFFormObj_GetSubObject(FPDF_PAGEOBJECT form_object, int index);
++
+ #ifdef __cplusplus
+ }  // extern "C"
+ #endif  // __cplusplus
+-- 
+2.16.3
+

external/pdfium/UnpackedTarball_pdfium.mk

@@ -23,6 +23,7 @@ pdfium_patches += 0006-svx-improve-path-importing-from-PDF.patch.2
 pdfium_patches += 0007-svx-improved-text-importing-from-PDF.patch.2
 pdfium_patches += 0008-svx-correct-the-positioning-of-PDF-Paths-and-the-str.patch.2
 pdfium_patches += 0009-svx-support-color-text-for-imported-PDFs.patch.2
+pdfium_patches += 0010-svx-support-importing-forms-from-PDFs.patch.2
 
 $(eval $(call gb_UnpackedTarball_UnpackedTarball,pdfium))
 

svx/source/svdraw/svdpdf.cxx

@@ -229,32 +229,7 @@ void ImpSdrPdfImport::DoLoopActions(SvdProgressInfo* pProgrInfo, sal_uInt32* pAc
         for (int nPageObjectIndex = 0; nPageObjectIndex < nPageObjectCount; ++nPageObjectIndex)
         {
             FPDF_PAGEOBJECT pPageObject = FPDFPage_GetObject(pPdfPage, nPageObjectIndex);
-            if (pPageObject == nullptr)
-                continue;
-
-            const int nPageObjectType = FPDFPageObj_GetType(pPageObject);
-            switch (nPageObjectType)
-            {
-                case FPDF_PAGEOBJ_TEXT:
-                    ImportText(pPageObject, nPageObjectIndex);
-                    break;
-                case FPDF_PAGEOBJ_PATH:
-                    ImportPath(pPageObject, nPageObjectIndex);
-                    break;
-                case FPDF_PAGEOBJ_IMAGE:
-                    ImportImage(pPageObject, nPageObjectIndex);
-                    break;
-                case FPDF_PAGEOBJ_SHADING:
-                    SAL_WARN("sd.filter", "Got page object SHADING: " << nPageObjectIndex);
-                    break;
-                case FPDF_PAGEOBJ_FORM:
-                    SAL_WARN("sd.filter", "Got page object FORM: " << nPageObjectIndex);
-                    break;
-                default:
-                    SAL_WARN("sd.filter", "Unknown PDF page object type: "
-                                              << nPageObjectType << ": " << nPageObjectIndex);
-                    break;
-            }
+            ImportPdfObject(pPageObject, nPageObjectIndex);
         }
 
 #if 0
@@ -1015,6 +990,49 @@ void ImpSdrPdfImport::checkClip()
 }
 
 bool ImpSdrPdfImport::isClip() const { return !maClip.getB2DRange().isEmpty(); }
+
+void ImpSdrPdfImport::ImportPdfObject(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex)
+{
+    if (pPageObject == nullptr)
+        return;
+
+    const int nPageObjectType = FPDFPageObj_GetType(pPageObject);
+    switch (nPageObjectType)
+    {
+        case FPDF_PAGEOBJ_TEXT:
+            ImportText(pPageObject, nPageObjectIndex);
+            break;
+        case FPDF_PAGEOBJ_PATH:
+            ImportPath(pPageObject, nPageObjectIndex);
+            break;
+        case FPDF_PAGEOBJ_IMAGE:
+            ImportImage(pPageObject, nPageObjectIndex);
+            break;
+        case FPDF_PAGEOBJ_SHADING:
+            SAL_WARN("sd.filter", "Got page object SHADING: " << nPageObjectIndex);
+            break;
+        case FPDF_PAGEOBJ_FORM:
+            ImportForm(pPageObject, nPageObjectIndex);
+            break;
+        default:
+            SAL_WARN("sd.filter", "Unknown PDF page object #" << nPageObjectIndex
+                                                              << " of type: " << nPageObjectType);
+            break;
+    }
+}
+
+void ImpSdrPdfImport::ImportForm(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex)
+{
+    SAL_WARN("sd.filter", "Got page object FORM: " << nPageObjectIndex);
+
+    const int nCount = FPDFFormObj_CountSubObjects(pPageObject);
+    for (int nIndex = 0; nIndex < nCount; ++nIndex)
+    {
+        FPDF_PAGEOBJECT pFormObject = FPDFFormObj_GetSubObject(pPageObject, nIndex);
+        ImportPdfObject(pFormObject, -1);
+    }
+}
+
 void ImpSdrPdfImport::ImportText(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex)
 {
     SAL_WARN("sd.filter", "Got page object TEXT: " << nPageObjectIndex);

svx/source/svdraw/svdpdf.hxx

@@ -100,13 +100,14 @@ class ImpSdrPdfImport final
     void checkClip();
     bool isClip() const;
 
+    void ImportPdfObject(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex);
+    void ImportForm(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex);
     void ImportImage(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex);
-    void SetupPageScale(const double dPageWidth, const double dPageHeight);
-
     void ImportPath(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex);
-
     void ImportText(FPDF_PAGEOBJECT pPageObject, int nPageObjectIndex);
     void ImportText(const Point& rPos, const Size& rSize, const OUString& rStr);
+
+    void SetupPageScale(const double dPageWidth, const double dPageHeight);
     void SetAttributes(SdrObject* pObj, bool bForceTextAttr = false);
     void InsertObj(SdrObject* pObj, bool bScale = true);
     void MapScaling();