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, 12 insertions, 12 deletions

diff --git a/fpdfsdk/fpdf_progressive.cpp b/fpdfsdk/fpdf_progressive.cpp
index 2411869904..c52f3707cc 100644
--- a/fpdfsdk/fpdf_progressive.cpp
+++ b/fpdfsdk/fpdf_progressive.cpp
@@ -30,15 +30,15 @@ static_assert(CPDF_ProgressiveRenderer::Done == FPDF_RENDER_DONE,
 static_assert(CPDF_ProgressiveRenderer::Failed == FPDF_RENDER_FAILED,
               "CPDF_ProgressiveRenderer::Failed value mismatch");
 
-DLLEXPORT int STDCALL FPDF_RenderPageBitmap_Start(FPDF_BITMAP bitmap,
-                                                  FPDF_PAGE page,
-                                                  int start_x,
-                                                  int start_y,
-                                                  int size_x,
-                                                  int size_y,
-                                                  int rotate,
-                                                  int flags,
-                                                  IFSDK_PAUSE* pause) {
+FPDF_EXPORT int FPDF_CALLCONV FPDF_RenderPageBitmap_Start(FPDF_BITMAP bitmap,
+                                                          FPDF_PAGE page,
+                                                          int start_x,
+                                                          int start_y,
+                                                          int size_x,
+                                                          int size_y,
+                                                          int rotate,
+                                                          int flags,
+                                                          IFSDK_PAUSE* pause) {
   if (!bitmap || !pause || pause->version != 1)
     return FPDF_RENDER_FAILED;
 
@@ -71,8 +71,8 @@ DLLEXPORT int STDCALL FPDF_RenderPageBitmap_Start(FPDF_BITMAP bitmap,
   return FPDF_RENDER_FAILED;
 }
 
-DLLEXPORT int STDCALL FPDF_RenderPage_Continue(FPDF_PAGE page,
-                                               IFSDK_PAUSE* pause) {
+FPDF_EXPORT int FPDF_CALLCONV FPDF_RenderPage_Continue(FPDF_PAGE page,
+                                                       IFSDK_PAUSE* pause) {
   if (!pause || pause->version != 1)
     return FPDF_RENDER_FAILED;
 
@@ -95,7 +95,7 @@ DLLEXPORT int STDCALL FPDF_RenderPage_Continue(FPDF_PAGE page,
   return FPDF_RENDER_FAILED;
 }
 
-DLLEXPORT void STDCALL FPDF_RenderPage_Close(FPDF_PAGE page) {
+FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPage_Close(FPDF_PAGE page) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (pPage) {
 #ifdef _SKIA_SUPPORT_PATHS_