Make FPDF_FormHandle be represented as an incomplete type.chromium/3510

Make consistent with other public API types.

Introduce CPDFSDKFormFillEnvironmentFromFPDFFormHandle() and
FPDFFormHandleFromCPDFSDKFormFillEnvironment() helper functions.
Use these to kill off some casts in the process.

Change-Id: I6230ecdb4cecd03076f5e24c8cc49c45ad694da7
Reviewed-on: https://pdfium-review.googlesource.com/39250
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/fpdfsdk/cpdfsdk_helpers.h b/fpdfsdk/cpdfsdk_helpers.h
index 4fd85cfc72..5de947afdf 100644
--- a/fpdfsdk/cpdfsdk_helpers.h
+++ b/fpdfsdk/cpdfsdk_helpers.h
@@ -38,6 +38,7 @@ class CPDF_StructElement;
 class CPDF_StructTree;
 class CPDF_TextPage;
 class CPDF_TextPageFind;
+class CPDFSDK_FormFillEnvironment;
 class IPDFSDK_PauseAdapter;
 class FX_PATHPOINT;
 
@@ -197,6 +198,15 @@ inline CPDF_TextPageFind* CPDFTextPageFindFromFPDFSchHandle(
   return reinterpret_cast<CPDF_TextPageFind*>(handle);
 }
 
+inline FPDF_FORMHANDLE FPDFFormHandleFromCPDFSDKFormFillEnvironment(
+    CPDFSDK_FormFillEnvironment* handle) {
+  return reinterpret_cast<FPDF_FORMHANDLE>(handle);
+}
+inline CPDFSDK_FormFillEnvironment*
+CPDFSDKFormFillEnvironmentFromFPDFFormHandle(FPDF_FORMHANDLE handle) {
+  return reinterpret_cast<CPDFSDK_FormFillEnvironment*>(handle);
+}
+
 ByteString CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string);
 
 #ifdef PDF_ENABLE_XFA