Add a build target and a proper export header for shared library builds.

This CL adds support for Chromium's component build feature to pdfium.

The export header stub in fpdfview.h is expanded to match Chromium's
export mechanisms and patterns (fixes pdfium:825).

A component/shared library build can be triggered by adding

is_component_build = true

as a gn argument. Please note that setting this will also affect some
of pdfiums dependencies like v8, which will be build as components
too.

Additionally, this CL provides a "pdf_source_set" template which
dynamically enables the use of "source_set" when building a complete
static library or a shared library to reduce build time.

When testing this it is recommended to only build the pdfium target as
most of pdfiums test rely on non-public functions which aren't exported
by the shared library.

Bug: pdfium:825,pdfium:826
Change-Id: Icedc538ec535e11d1e53c4d5fabc8c064b275752
Reviewed-on: https://pdfium-review.googlesource.com/8970
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 32 insertions, 31 deletions

diff --git a/fpdfsdk/fpdf_transformpage.cpp b/fpdfsdk/fpdf_transformpage.cpp
index b419ad1fb2..93df594618 100644
--- a/fpdfsdk/fpdf_transformpage.cpp
+++ b/fpdfsdk/fpdf_transformpage.cpp
@@ -56,11 +56,11 @@ bool GetBoundingBox(CPDF_Page* page,
 
 }  // namespace
 
-DLLEXPORT void STDCALL FPDFPage_SetMediaBox(FPDF_PAGE page,
-                                            float left,
-                                            float bottom,
-                                            float right,
-                                            float top) {
+FPDF_EXPORT void FPDF_CALLCONV FPDFPage_SetMediaBox(FPDF_PAGE page,
+                                                    float left,
+                                                    float bottom,
+                                                    float right,
+                                                    float top) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;
@@ -68,11 +68,11 @@ DLLEXPORT void STDCALL FPDFPage_SetMediaBox(FPDF_PAGE page,
   SetBoundingBox(pPage, "MediaBox", left, bottom, right, top);
 }
 
-DLLEXPORT void STDCALL FPDFPage_SetCropBox(FPDF_PAGE page,
-                                           float left,
-                                           float bottom,
-                                           float right,
-                                           float top) {
+FPDF_EXPORT void FPDF_CALLCONV FPDFPage_SetCropBox(FPDF_PAGE page,
+                                                   float left,
+                                                   float bottom,
+                                                   float right,
+                                                   float top) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;
@@ -80,27 +80,28 @@ DLLEXPORT void STDCALL FPDFPage_SetCropBox(FPDF_PAGE page,
   SetBoundingBox(pPage, "CropBox", left, bottom, right, top);
 }
 
-DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GetMediaBox(FPDF_PAGE page,
-                                                 float* left,
-                                                 float* bottom,
-                                                 float* right,
-                                                 float* top) {
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_GetMediaBox(FPDF_PAGE page,
+                                                         float* left,
+                                                         float* bottom,
+                                                         float* right,
+                                                         float* top) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   return pPage && GetBoundingBox(pPage, "MediaBox", left, bottom, right, top);
 }
 
-DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GetCropBox(FPDF_PAGE page,
-                                                float* left,
-                                                float* bottom,
-                                                float* right,
-                                                float* top) {
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_GetCropBox(FPDF_PAGE page,
+                                                        float* left,
+                                                        float* bottom,
+                                                        float* right,
+                                                        float* top) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   return pPage && GetBoundingBox(pPage, "CropBox", left, bottom, right, top);
 }
 
-DLLEXPORT FPDF_BOOL STDCALL FPDFPage_TransFormWithClip(FPDF_PAGE page,
-                                                       FS_MATRIX* matrix,
-                                                       FS_RECTF* clipRect) {
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
+FPDFPage_TransFormWithClip(FPDF_PAGE page,
+                           FS_MATRIX* matrix,
+                           FS_RECTF* clipRect) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return false;
@@ -197,7 +198,7 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFPage_TransFormWithClip(FPDF_PAGE page,
   return true;
 }
 
-DLLEXPORT void STDCALL
+FPDF_EXPORT void FPDF_CALLCONV
 FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,
                               double a,
                               double b,
@@ -217,10 +218,10 @@ FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,
   pPageObj->TransformGeneralState(matrix);
 }
 
-DLLEXPORT FPDF_CLIPPATH STDCALL FPDF_CreateClipPath(float left,
-                                                    float bottom,
-                                                    float right,
-                                                    float top) {
+FPDF_EXPORT FPDF_CLIPPATH FPDF_CALLCONV FPDF_CreateClipPath(float left,
+                                                            float bottom,
+                                                            float right,
+                                                            float top) {
   CPDF_Path Path;
   Path.AppendRect(left, bottom, right, top);
 
@@ -229,7 +230,7 @@ DLLEXPORT FPDF_CLIPPATH STDCALL FPDF_CreateClipPath(float left,
   return pNewClipPath.release();  // Caller takes ownership.
 }
 
-DLLEXPORT void STDCALL FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath) {
+FPDF_EXPORT void FPDF_CALLCONV FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath) {
   // Take ownership back from caller and destroy.
   std::unique_ptr<CPDF_ClipPath>(static_cast<CPDF_ClipPath*>(clipPath));
 }
@@ -271,8 +272,8 @@ void OutputPath(std::ostringstream& buf, CPDF_Path path) {
   }
 }
 
-DLLEXPORT void STDCALL FPDFPage_InsertClipPath(FPDF_PAGE page,
-                                               FPDF_CLIPPATH clipPath) {
+FPDF_EXPORT void FPDF_CALLCONV FPDFPage_InsertClipPath(FPDF_PAGE page,
+                                                       FPDF_CLIPPATH clipPath) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;