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 94 matching lines @@
 }  // namespace chrome_pdf
 
 extern "C" {
 
 // TODO(sanjeevr): It might make sense to provide more stateful wrappers over
 // the internal PDF SDK (such as LoadDocument, LoadPage etc). Determine if we
 // need to provide this.
 // Wrapper exports over the PDF engine that can be used by an external module
 // such as Chrome (since Chrome cannot directly pull in PDFium sources).
 #if defined(OS_WIN)
-// |pdf_buffer| is the buffer that contains the entire PDF document to be
-//     rendered.
-// |buffer_size| is the size of pdf_buffer in bytes.
-// |page_number| is the 0-based index of the page to be rendered.
-// |dc| is the device context to render into.
-// |dpi_x| and |dpi_y| are the x and y resolutions respectively. If either value
-//     is -1, the dpi from the DC will be used.
-// |bounds_origin_x|, |bounds_origin_y|, |bounds_width| and |bounds_height|
-//     specify a bounds rectangle within the DC in which to render the PDF page.
-// |fit_to_bounds| specifies whether the output should be shrunk to fit the
-//     supplied bounds if the page size is larger than the bounds in any
-//     dimension. If this is false, parts of the PDF page that lie outside the
-//     bounds will be clipped.
-// |stretch_to_bounds| specifies whether the output should be stretched to fit
-//     the supplied bounds if the page size is smaller than the bounds in any
-//     dimension.
-// If both |fit_to_bounds| and |stretch_to_bounds| are true, then
-//     |fit_to_bounds| is honored first.
-// |keep_aspect_ratio| If any scaling is to be done is true, this flag specifies
-//     whether the original aspect ratio of the page should be preserved while
-//     scaling.
-// |center_in_bounds| specifies whether the final image (after any scaling is
-//     done) should be centered within the given bounds.
-// |autorotate| specifies whether the final image should be rotated to match
-//     the output bound.
-// Returns false if the document or the page number are not valid.
 PP_EXPORT bool RenderPDFPageToDC(const void* pdf_buffer,
                                  int buffer_size,
                                  int page_number,
                                  HDC dc,
                                  int dpi_x,
                                  int dpi_y,
                                  int bounds_origin_x,
                                  int bounds_origin_y,
                                  int bounds_width,
                                  int bounds_height,
@@ skipping 17 matching lines @@
   bool ret = engine_exports->RenderPDFPageToDC(pdf_buffer, buffer_size,
                                                page_number, settings, dc);
   if (!g_sdk_initialized_via_pepper) {
     chrome_pdf::ShutdownSDK();
   }
   return ret;
 }
 
 #endif  // OS_WIN
 
-// |page_count| and |max_page_width| are optional and can be NULL.
-// Returns false if the document is not valid.
 PDF_USED PP_EXPORT
 bool GetPDFDocInfo(const void* pdf_buffer,
                    int buffer_size, int* page_count,
                    double* max_page_width) {
   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->GetPDFDocInfo(
       pdf_buffer, buffer_size, page_count, max_page_width);
   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
-//     the output bound.
-// Returns false if the document or the page number are not valid.
+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;
+}
+
 PDF_USED PP_EXPORT
 bool RenderPDFPageToBitmap(const void* pdf_buffer,
                            int pdf_buffer_size,
                            int page_number,
                            void* bitmap_buffer,
                            int bitmap_width,
                            int bitmap_height,
                            int dpi,
                            bool autorotate) {
   if (!g_sdk_initialized_via_pepper) {
@@ skipping 11 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"