Added options to save pages into BMP and EMF on Windows.

samples/pdfium_test.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 <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <list>
 #include <string>
 #include <utility>
 
 #include "../fpdfsdk/include/fpdf_dataavail.h"
 #include "../fpdfsdk/include/fpdf_ext.h"
 #include "../fpdfsdk/include/fpdfformfill.h"
 #include "../fpdfsdk/include/fpdftext.h"
 #include "../fpdfsdk/include/fpdfview.h"
 #include "v8/include/v8.h"
 
 #ifdef _WIN32
   #define snprintf _snprintf
 #endif
 
-static void WritePpm(const char* pdf_name, int num,
-                     const char* buffer, int stride, int width, int height) {
+enum OutputFormat {
+  OUTPUT_NONE,
+  OUTPUT_PPM,
+#ifdef _WIN32
+  OUTPUT_BMP,
+  OUTPUT_EMF,
+#endif
+};
+
+static void WritePpm(const char* pdf_name, int num, const void* buffer_void,
+                     int stride, int width, int height) {
+  const char* buffer = reinterpret_cast<const char*>(buffer_void);
+
   if (stride < 0 || width < 0 || height < 0)
     return;
   if (height > 0 && width > INT_MAX / height)
     return;
   int out_len = width * height;
   if (out_len > INT_MAX / 3)
     return;
   out_len *= 3;
 
   char filename[256];
@@ skipping 17 matching lines @@
         // B
         dest_line[(w * 3) + 2] = src_line[w * 4];
       }
     }
     fwrite(result, out_len, 1, fp);
     delete [] result;
   }
   fclose(fp);
 }
 
+#ifdef _WIN32
+static void WriteBmp(const char* pdf_name, int num, const void* buffer,
+                     int stride, int width, int height) {
+  if (stride < 0 || width < 0 || height < 0)
+    return;
+  if (height > 0 && width > INT_MAX / height)
+    return;
+  int out_len = stride * height;
+  if (out_len > INT_MAX / 3)
+    return;
+
+  char filename[256];
+  snprintf(filename, sizeof(filename), "%s.%d.bmp", pdf_name, num);
+  FILE* fp = fopen(filename, "wb");
+  if (!fp)
+    return;
+
+  BITMAPINFO bmi = {0};
+  bmi.bmiHeader.biSize = sizeof(bmi) - sizeof(RGBQUAD);
+  bmi.bmiHeader.biWidth = width;
+  bmi.bmiHeader.biHeight = -height;  // top-down image
+  bmi.bmiHeader.biPlanes = 1;
+  bmi.bmiHeader.biBitCount = 32;
+  bmi.bmiHeader.biCompression = BI_RGB;
+  bmi.bmiHeader.biSizeImage = 0;
+
+  BITMAPFILEHEADER file_header = {0};
+  file_header.bfType = 0x4d42;
+  file_header.bfSize = sizeof(file_header) + bmi.bmiHeader.biSize + out_len;
+  file_header.bfOffBits = file_header.bfSize - out_len;
+
+  fwrite(&file_header, sizeof(file_header), 1, fp);
+  fwrite(&bmi, bmi.bmiHeader.biSize, 1, fp);
+  fwrite(buffer, out_len, 1, fp);
+  fclose(fp);
+}
+
+HDC CreatePageMetafile(const char* pdf_name, int num, int width, int height) {
+  char filename[256];
+  snprintf(filename, sizeof(filename), "%s.%d_%dx%d.emf", pdf_name, num, width,
+           height);
+  return CreateEnhMetaFileA(NULL, filename, NULL, NULL);
+}
+#endif
+
 int Form_Alert(IPDF_JSPLATFORM*, FPDF_WIDESTRING, FPDF_WIDESTRING, int, int) {
   printf("Form_Alert called.\n");
   return 0;
 }
 
 void Unsupported_Handler(UNSUPPORT_INFO*, int type) {
   std::string feature = "Unknown";
   switch (type) {
     case FPDF_UNSP_DOC_XFAFORM:
       feature = "XFA";
@@ skipping 29 matching lines @@
     case FPDF_UNSP_ANNOT_SCREEN_RICHMEDIA:
       feature = "Screen";
       break;
     case FPDF_UNSP_ANNOT_SIG:
       feature = "Digital_Signature";
       break;
   }
   printf("Unsupported feature: %s.\n", feature.c_str());
 }
 
-bool ParseCommandLine(int argc, const char* argv[], bool* write_images,
+bool ParseCommandLine(int argc, const char* argv[], OutputFormat* output_format,
                       std::list<const char*>* files) {
-  *write_images = false;
+  *output_format = OUTPUT_NONE;
   files->clear();
 
   int cur_arg = 1;
-  if (cur_arg < argc &&
-      strcmp(argv[cur_arg], "--write_images") == 0) {
-    *write_images = true;
+  if (cur_arg < argc) {
+    if (strcmp(argv[cur_arg], "--ppm") == 0)
+      *output_format = OUTPUT_PPM;
+#ifdef _WIN32
+    if (strcmp(argv[cur_arg], "--emf") == 0)
+      *output_format = OUTPUT_EMF;
+    if (strcmp(argv[cur_arg], "--bmp") == 0)
+      *output_format = OUTPUT_BMP;
+#endif
     cur_arg++;
   }
 
   if (cur_arg >= argc)
     return false;
 
   for (int i = cur_arg; i < argc; i++)
     files->push_back(argv[i]);
 
   return true;
@@ skipping 20 matching lines @@
 }
 
 bool Is_Data_Avail(FX_FILEAVAIL* pThis, size_t offset, size_t size) {
   return true;
 }
 
 void Add_Segment(FX_DOWNLOADHINTS* pThis, size_t offset, size_t size) {
 }
 
 void RenderPdf(const char* name, const char* pBuf, size_t len,
-               bool write_images) {
+               OutputFormat format) {
   printf("Rendering PDF file %s.\n", name);
 
   IPDF_JSPLATFORM platform_callbacks;
   memset(&platform_callbacks, '\0', sizeof(platform_callbacks));
   platform_callbacks.version = 1;
   platform_callbacks.app_alert = Form_Alert;
 
   FPDF_FORMFILLINFO form_callbacks;
   memset(&form_callbacks, '\0', sizeof(form_callbacks));
   form_callbacks.version = 1;
@@ skipping 54 matching lines @@
     FORM_OnAfterLoadPage(page, form);
     FORM_DoPageAAction(page, form, FPDFPAGE_AACTION_OPEN);
 
     int width = static_cast<int>(FPDF_GetPageWidth(page));
     int height = static_cast<int>(FPDF_GetPageHeight(page));
     FPDF_BITMAP bitmap = FPDFBitmap_Create(width, height, 0);
     FPDFBitmap_FillRect(bitmap, 0, 0, width, height, 0xFFFFFFFF);
 
     FPDF_RenderPageBitmap(bitmap, page, 0, 0, width, height, 0, 0);
     FPDF_FFLDraw(form, bitmap, page, 0, 0, width, height, 0, 0);
-    if (write_images) {
-      const char* buffer = reinterpret_cast<const char*>(
-          FPDFBitmap_GetBuffer(bitmap));
-      int stride = FPDFBitmap_GetStride(bitmap);
-      WritePpm(name, i, buffer, stride, width, height);
+    int stride = FPDFBitmap_GetStride(bitmap);
+    const char* buffer =
+        reinterpret_cast<const char*>(FPDFBitmap_GetBuffer(bitmap));
+
+    switch(format) {
+#ifdef _WIN32
+      case OUTPUT_BMP:
+        WriteBmp(name, i, buffer, stride, width, height);
+        break;
+#endif
+      case OUTPUT_PPM:
+        WritePpm(name, i, buffer, stride, width, height);
+        break;
+      default:
+        break;
     }
 
     FPDFBitmap_Destroy(bitmap);
 
+#ifdef _WIN32
+    HDC dc = (format == OUTPUT_EMF) ?
+             CreatePageMetafile(name, i, width, height) :
+             CreateEnhMetaFile(NULL, NULL, NULL, NULL);
+    FPDF_RenderPage(dc, page, 0, 0, width, height,
+                    0, FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
+    DeleteEnhMetaFile(CloseEnhMetaFile(dc));

[Bo Xu, 2014/07/22 23:13:48]

It seems we won't do anything when (format == OUTPUT_BMP), what about the
following to eliminate the FPDF_RenderPage call when format==OUTPUT_BMP

if (format == OUTPUT_EMF)
{
    HDC dc = CreatePageMetafile(name, i, width, height);
    FPDF_RenderPage(dc, page, 0, 0, width, height,
                    0, FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
    DeleteEnhMetaFile(CloseEnhMetaFile(dc));
}

Also, I checked the output emf file, it is not exactly the same as the bmp,
corner is cropped.

[Vitaly Buka (NO REVIEWS), 2014/07/22 23:24:46]

Actually idea was to call that code just like it done for images.
if no switches are there, it still renders bitmap.

But I can change as you suggesting.
How exactly this cropped?
This could be cropped to match your screen resolution
what do you see if you call FPDF_RenderPage(dc, page, 0, 0, 500, 500, ?

+#endif
+
     FORM_DoPageAAction(page, form, FPDFPAGE_AACTION_CLOSE);
     FORM_OnBeforeClosePage(page, form);
     FPDFText_ClosePage(text_page);
     FPDF_ClosePage(page);
   }
 
   FORM_DoDocumentAAction(form, FPDFDOC_AACTION_WC);
   FPDFDOC_ExitFormFillEnviroument(form);
   FPDF_CloseDocument(doc);
   FPDFAvail_Destroy(pdf_avail);
 
   printf("Loaded, parsed and rendered %d pages.\n", page_count);
 }
 
 int main(int argc, const char* argv[]) {
   v8::V8::InitializeICU();
-  bool write_images = false;
+  OutputFormat format = OUTPUT_NONE;
   std::list<const char*> files;
-  if (!ParseCommandLine(argc, argv, &write_images, &files)) {
-    printf("Usage is: test [--write_images] /path/to/pdf\n");
-    printf("--write_images - to write page images <pdf-name>.<page-number>.ppm\n");
+  if (!ParseCommandLine(argc, argv, &format, &files)) {
+    printf("Usage: pdfium_test [OPTIONS] [FILE]\n");
+    printf("--ppm    write page images <pdf-name>.<page-number>.ppm\n");
+#ifdef _WIN32
+    printf("--bmp    write page images <pdf-name>.<page-number>.bmp\n");
+    printf("--emf    write page meta files <pdf-name>.<page-number>.emf\n");
+#endif
     return 1;
   }
 
   FPDF_InitLibrary(NULL);
 
   UNSUPPORT_INFO unsuppored_info;
   memset(&unsuppored_info, '\0', sizeof(unsuppored_info));
   unsuppored_info.version = 1;
   unsuppored_info.FSDK_UnSupport_Handler = Unsupported_Handler;
 
   FSDK_SetUnSpObjProcessHandler(&unsuppored_info);
 
   while (!files.empty()) {
     const char* filename = files.front();
     files.pop_front();
     FILE* file = fopen(filename, "rb");
     if (!file) {
       fprintf(stderr, "Failed to open: %s\n", filename);
       continue;
     }
     (void) fseek(file, 0, SEEK_END);
     size_t len = ftell(file);
     (void) fseek(file, 0, SEEK_SET);
     char* pBuf = (char*) malloc(len);
     size_t ret = fread(pBuf, 1, len, file);
     (void) fclose(file);
     if (ret != len) {
       fprintf(stderr, "Failed to read: %s\n", filename);
     } else {
-      RenderPdf(filename, pBuf, len, write_images);
+      RenderPdf(filename, pBuf, len, format);
     }
     free(pBuf);
   }
 
   FPDF_DestroyLibrary();
 
   return 0;
 }
-