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/public/fpdf_transformpage.h b/public/fpdf_transformpage.h
index 66271fcda8..f26c077bde 100644
--- a/public/fpdf_transformpage.h
+++ b/public/fpdf_transformpage.h
@@ -26,11 +26,11 @@ typedef void* FPDF_PAGEARCLOADER;
 * @param[in] top    - The top of the rectangle.
 * @retval None.
 */
-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);
 
 /**
 *  Set "CropBox" entry to the page dictionary.
@@ -41,11 +41,11 @@ DLLEXPORT void STDCALL FPDFPage_SetMediaBox(FPDF_PAGE page,
 * @param[in] top    - The top of the rectangle.
 * @retval None.
 */
-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);
 
 /**  Get "MediaBox" entry from the page dictionary.
 * @param[in] page   - Handle to a page.
@@ -59,11 +59,11 @@ DLLEXPORT void STDCALL FPDFPage_SetCropBox(FPDF_PAGE page,
 * rectangle.
 * @retval True if success,else fail.
 */
-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);
 
 /**  Get "CropBox" entry from the page dictionary.
 * @param[in] page   - Handle to a page.
@@ -77,11 +77,11 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GetMediaBox(FPDF_PAGE page,
 * rectangle.
 * @retval True if success,else fail.
 */
-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);
 
 /**
 * Transform the whole page with a specified matrix, then clip the page content
@@ -93,9 +93,10 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFPage_GetCropBox(FPDF_PAGE page,
 * @Note. This function will transform the whole page, and would take effect to
 * all the objects in the page.
 */
-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);
 
 /**
 * Transform (scale, rotate, shear, move) the clip path of page object.
@@ -109,7 +110,7 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFPage_TransFormWithClip(FPDF_PAGE page,
 * @param[in] f  - The coefficient "f" of the matrix.
 * @retval None.
 */
-DLLEXPORT void STDCALL
+FPDF_EXPORT void FPDF_CALLCONV
 FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,
                               double a,
                               double b,
@@ -127,10 +128,10 @@ FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,
 * @param[in] top    - The top of the clip box.
 * @retval a handle to the clip path.
 */
-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);
 
 /**
 * Destroy the clip path.
@@ -139,7 +140,7 @@ DLLEXPORT FPDF_CLIPPATH STDCALL FPDF_CreateClipPath(float left,
 * Destroy the clip path.
 * @retval None.
 */
-DLLEXPORT void STDCALL FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath);
+FPDF_EXPORT void FPDF_CALLCONV FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath);
 
 /**
 * Clip the page content, the page content that outside the clipping region
@@ -151,8 +152,8 @@ DLLEXPORT void STDCALL FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath);
 * array. In this way, the page content will be clipped
 * by this clip 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);
 
 #ifdef __cplusplus
 }