From dc7ec035a6962b788e75f4beaa4cf8fbddd83d39 Mon Sep 17 00:00:00 2001
From: thestig <thestig@chromium.org>
Date: Mon, 21 Nov 2016 15:32:52 -0800
Subject: Add a regression test for rasterizing PDFs.

BUG=chromium:667012

Review-Url: https://codereview.chromium.org/2508203007
---
 fpdfsdk/fpdfedit_embeddertest.cpp |  82 ++++++++++++++++++++++++++++++++++++++
 testing/resources/black.pdf       | Bin 0 -> 923 bytes
 2 files changed, 82 insertions(+)
 create mode 100644 testing/resources/black.pdf

diff --git a/fpdfsdk/fpdfedit_embeddertest.cpp b/fpdfsdk/fpdfedit_embeddertest.cpp
index 1f96b89677..40bed3a565 100644
--- a/fpdfsdk/fpdfedit_embeddertest.cpp
+++ b/fpdfsdk/fpdfedit_embeddertest.cpp
@@ -15,6 +15,7 @@
 class FPDFEditEmbeddertest : public EmbedderTest, public TestSaver {};
 
 namespace {
+
 const char kExpectedPDF[] =
     "%PDF-1.7\r\n"
     "%\xA1\xB3\xC5\xD7\r\n"
@@ -54,6 +55,23 @@ const char kExpectedPDF[] =
     "startxref\r\n"
     "379\r\n"
     "%%EOF\r\n";
+
+int GetBlockFromString(void* param,
+                       unsigned long pos,
+                       unsigned char* buf,
+                       unsigned long size) {
+  std::string* new_file = static_cast<std::string*>(param);
+  if (!new_file || pos + size < pos)
+    return 0;
+
+  unsigned long file_size = new_file->size();
+  if (pos + size > file_size)
+    return 0;
+
+  memcpy(buf, new_file->data() + pos, size);
+  return 1;
+}
+
 }  // namespace
 
 TEST_F(FPDFEditEmbeddertest, EmptyCreation) {
@@ -71,3 +89,67 @@ TEST_F(FPDFEditEmbeddertest, EmptyCreation) {
                           std::string(kExpectedPDF, sizeof(kExpectedPDF))));
   FPDF_ClosePage(page);
 }
+
+// Regression test for https://crbug.com/667012
+TEST_F(FPDFEditEmbeddertest, RasterizePDF) {
+  const char kAllBlackMd5sum[] = "5708fc5c4a8bd0abde99c8e8f0390615";
+
+  // Get the bitmap for the original document/
+  FPDF_BITMAP orig_bitmap;
+  {
+    EXPECT_TRUE(OpenDocument("black.pdf"));
+    FPDF_PAGE orig_page = LoadPage(0);
+    EXPECT_NE(nullptr, orig_page);
+    orig_bitmap = RenderPage(orig_page);
+    CompareBitmap(orig_bitmap, 612, 792, kAllBlackMd5sum);
+    UnloadPage(orig_page);
+  }
+
+  // Create a new document from |orig_bitmap| and save it.
+  {
+    FPDF_DOCUMENT temp_doc = FPDF_CreateNewDocument();
+    FPDF_PAGE temp_page = FPDFPage_New(temp_doc, 0, 612, 792);
+
+    // Add the bitmap to an image object and add the image object to the output
+    // page.
+    FPDF_PAGEOBJECT temp_img = FPDFPageObj_NewImgeObj(temp_doc);
+    EXPECT_TRUE(FPDFImageObj_SetBitmap(&temp_page, 1, temp_img, orig_bitmap));
+    EXPECT_TRUE(FPDFImageObj_SetMatrix(temp_img, 612, 0, 0, 792, 0, 0));
+    FPDFPage_InsertObject(temp_page, temp_img);
+    EXPECT_TRUE(FPDFPage_GenerateContent(temp_page));
+    EXPECT_TRUE(FPDF_SaveAsCopy(temp_doc, this, 0));
+    FPDF_ClosePage(temp_page);
+    FPDF_CloseDocument(temp_doc);
+  }
+  FPDFBitmap_Destroy(orig_bitmap);
+
+  // Get the generated content. Make sure it is at least as big as the original
+  // PDF.
+  std::string new_file = GetString();
+  EXPECT_GT(new_file.size(), 923U);
+
+  // Read |new_file| in, and verify its rendered bitmap.
+  {
+    FPDF_FILEACCESS file_access;
+    memset(&file_access, 0, sizeof(file_access));
+    file_access.m_FileLen = new_file.size();
+    file_access.m_GetBlock = GetBlockFromString;
+    file_access.m_Param = &new_file;
+
+    FPDF_DOCUMENT new_doc = FPDF_LoadCustomDocument(&file_access, nullptr);
+    EXPECT_EQ(1, FPDF_GetPageCount(document_));
+    FPDF_PAGE new_page = FPDF_LoadPage(new_doc, 0);
+    EXPECT_NE(nullptr, new_page);
+    int width = static_cast<int>(FPDF_GetPageWidth(new_page));
+    int height = static_cast<int>(FPDF_GetPageHeight(new_page));
+    int alpha = FPDFPage_HasTransparency(new_page) ? 1 : 0;
+    FPDF_BITMAP new_bitmap = FPDFBitmap_Create(width, height, alpha);
+    FPDF_DWORD fill_color = alpha ? 0x00000000 : 0xFFFFFFFF;
+    FPDFBitmap_FillRect(new_bitmap, 0, 0, width, height, fill_color);
+    FPDF_RenderPageBitmap(new_bitmap, new_page, 0, 0, width, height, 0, 0);
+    CompareBitmap(new_bitmap, 612, 792, kAllBlackMd5sum);
+    FPDF_ClosePage(new_page);
+    FPDF_CloseDocument(new_doc);
+    FPDFBitmap_Destroy(new_bitmap);
+  }
+}
diff --git a/testing/resources/black.pdf b/testing/resources/black.pdf
new file mode 100644
index 0000000000..8513d9f3fd
Binary files /dev/null and b/testing/resources/black.pdf differ
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