Export a function from the PDF plugin to get the dimensions of a PDF page.

pdf/pdf.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "pdf/pdf.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
@@ skipping 181 matching lines @@
   scoped_ptr<chrome_pdf::PDFEngineExports> engine_exports(
       chrome_pdf::PDFEngineExports::Create());
   bool ret = engine_exports->GetPDFDocInfo(
       pdf_buffer, buffer_size, page_count, max_page_width);
   if (!g_sdk_initialized_via_pepper) {
     chrome_pdf::ShutdownSDK();
   }
   return ret;
 }
 
+// Gets the dimensions of a specific page in a document.
+// |pdf_buffer| is the buffer that contains the entire PDF document to be
+//     rendered.
+// |pdf_buffer_size| is the size of the pdf_buffer in bytes.

[Lei Zhang, 2014/07/09 21:59:51]

the pdf_buffer -> |pdf_buffer|

[ivandavid, 2014/07/09 22:53:40]

Done.

+// |page_number| is the page number that the function will get the dimensions
+//     of.
+// |width| is the output for the width of the page in points.
+// |height| is the output for the height of the page in points.
+// Returns false if the document or the page number are not valid.

[Dan Beam, 2014/07/09 22:18:21]

^ I'd say put this doc comment on the interface

[ivandavid, 2014/07/09 22:53:40]

OK. I put the comment in pdf_engine.h PDFEngineExports. I also moved over all
the other comments, since it would be inconsistent. The other comments is what I
went off of when writing this one. I also removed the comment that said where to
look for the code and I did this for all of the PDFEngineExports functions to be
consistent, since some of them had it and some of them didn't.

+PDF_USED PP_EXPORT
+bool GetPDFPageSizeByIndex(const void* pdf_buffer,
+                           int pdf_buffer_size, int page_number,
+                           double* width, double* height) {
+  if (!g_sdk_initialized_via_pepper) {
+    void* data = NULL;
+#if defined(OS_WIN)
+    data = g_hmodule;
+#endif
+    if (!chrome_pdf::InitializeSDK(data))
+      return false;
+  }
+  scoped_ptr<chrome_pdf::PDFEngineExports> engine_exports(
+      chrome_pdf::PDFEngineExports::Create());
+  bool ret = engine_exports->GetPDFPageSizeByIndex(
+      pdf_buffer, pdf_buffer_size, page_number, width, height);
+  if (!g_sdk_initialized_via_pepper)
+    chrome_pdf::ShutdownSDK();
+  return ret;
+}
+
 // Renders PDF page into 4-byte per pixel BGRA color bitmap.
 // |pdf_buffer| is the buffer that contains the entire PDF document to be
 //     rendered.
 // |pdf_buffer_size| is the size of pdf_buffer in bytes.
 // |page_number| is the 0-based index of the page to be rendered.
 // |bitmap_buffer| is the output buffer for bitmap.
 // |bitmap_width| is the width of the output bitmap.
 // |bitmap_height| is the height of the output bitmap.
 // |dpi| is the resolutions.
 // |autorotate| specifies whether the final image should be rotated to match
@@ skipping 23 matching lines @@
       autorotate);
   bool ret = engine_exports->RenderPDFPageToBitmap(
       pdf_buffer, pdf_buffer_size, page_number, settings, bitmap_buffer);
   if (!g_sdk_initialized_via_pepper) {
     chrome_pdf::ShutdownSDK();
   }
   return ret;
 }
 
 }  // extern "C"