Basic APIs and tests for extracting and setting annotation paths

1. Added APIs for retrieving existing annotation paths and setting
annotation paths.
    * Added an embedder test testing all the new functions.

Bug=pdfium:737

Change-Id: Ic451bcd3be488261baf2182549c4238b887b219e
Reviewed-on: https://pdfium-review.googlesource.com/6676
Commit-Queue: Jane Liu <janeliulwq@google.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

2 files changed, 15 insertions, 10 deletions

diff --git a/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp b/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
index 369c2a81ff..18bcbf909d 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
+++ b/core/fpdfapi/edit/cpdf_pagecontentgenerator.cpp
@@ -209,6 +209,9 @@ void CPDF_PageContentGenerator::ProcessImage(std::ostringstream* buf,
 void CPDF_PageContentGenerator::ProcessPath(std::ostringstream* buf,
                                             CPDF_PathObject* pPathObj) {
   ProcessGraphics(buf, pPathObj);
+
+  *buf << pPathObj->m_Matrix << " cm ";
+
   auto& pPoints = pPathObj->m_Path.GetPoints();
   if (pPathObj->m_Path.IsRect()) {
     CFX_PointF diff = pPoints[2].m_Point - pPoints[0].m_Point;
diff --git a/core/fpdfapi/edit/cpdf_pagecontentgenerator_unittest.cpp b/core/fpdfapi/edit/cpdf_pagecontentgenerator_unittest.cpp
index ef186666f1..62b10c9149 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentgenerator_unittest.cpp
+++ b/core/fpdfapi/edit/cpdf_pagecontentgenerator_unittest.cpp
@@ -58,7 +58,7 @@ TEST_F(CPDF_PageContentGeneratorTest, ProcessRect) {
   CPDF_PageContentGenerator generator(pTestPage.get());
   std::ostringstream buf;
   TestProcessPath(&generator, &buf, pPathObj.get());
-  EXPECT_EQ("q 10 5 3 25 re B* Q\n", CFX_ByteString(buf));
+  EXPECT_EQ("q 1 0 0 1 0 0 cm 10 5 3 25 re B* Q\n", CFX_ByteString(buf));
 
   pPathObj = pdfium::MakeUnique<CPDF_PathObject>();
   pPathObj->m_Path.AppendPoint(CFX_PointF(0, 0), FXPT_TYPE::MoveTo, false);
@@ -71,7 +71,7 @@ TEST_F(CPDF_PageContentGeneratorTest, ProcessRect) {
   buf.str("");
 
   TestProcessPath(&generator, &buf, pPathObj.get());
-  EXPECT_EQ("q 0 0 5.2 3.78 re n Q\n", CFX_ByteString(buf));
+  EXPECT_EQ("q 1 0 0 1 0 0 cm 0 0 5.2 3.78 re n Q\n", CFX_ByteString(buf));
 }
 
 TEST_F(CPDF_PageContentGeneratorTest, ProcessPath) {
@@ -103,8 +103,8 @@ TEST_F(CPDF_PageContentGeneratorTest, ProcessPath) {
   std::ostringstream buf;
   TestProcessPath(&generator, &buf, pPathObj.get());
   EXPECT_EQ(
-      "q 3.102 4.67 m 5.45 0.29 l 4.24 3.15 4.65 2.98 3.456 0.24 c 10.6 11.15 "
-      "l 11 12.5 l 11.46 12.67 11.84 12.96 12 13.64 c h f Q\n",
+      "q 1 0 0 1 0 0 cm 3.102 4.67 m 5.45 0.29 l 4.24 3.15 4.65 2.98 3.456 0.24"
+      " c 10.6 11.15 l 11 12.5 l 11.46 12.67 11.84 12.96 12 13.64 c h f Q\n",
       CFX_ByteString(buf));
 }
 
@@ -137,10 +137,11 @@ TEST_F(CPDF_PageContentGeneratorTest, ProcessGraphics) {
   // Color RGB values used are integers divided by 255.
   EXPECT_EQ("q 0.501961 0.701961 0.34902 rg 1 0.901961 0 RG /",
             pathString.Left(48));
-  EXPECT_EQ(" gs 1 2 m 3 4 l 5 6 l h B Q\n", pathString.Right(28));
-  ASSERT_TRUE(pathString.GetLength() > 76);
+  EXPECT_EQ(" gs 1 0 0 1 0 0 cm 1 2 m 3 4 l 5 6 l h B Q\n",
+            pathString.Right(43));
+  ASSERT_TRUE(pathString.GetLength() > 91);
   CPDF_Dictionary* externalGS = TestGetResource(
-      &generator, "ExtGState", pathString.Mid(48, pathString.GetLength() - 76));
+      &generator, "ExtGState", pathString.Mid(48, pathString.GetLength() - 91));
   ASSERT_TRUE(externalGS);
   EXPECT_EQ(0.5f, externalGS->GetNumberFor("ca"));
   EXPECT_EQ(0.8f, externalGS->GetNumberFor("CA"));
@@ -152,7 +153,8 @@ TEST_F(CPDF_PageContentGeneratorTest, ProcessGraphics) {
   CFX_ByteString pathString2(buf);
   EXPECT_EQ("q 0.501961 0.701961 0.34902 rg 1 0.901961 0 RG 10.5 w /",
             pathString2.Left(55));
-  EXPECT_EQ(" gs 1 2 m 3 4 l 5 6 l h B Q\n", pathString2.Right(28));
+  EXPECT_EQ(" gs 1 0 0 1 0 0 cm 1 2 m 3 4 l 5 6 l h B Q\n",
+            pathString2.Right(43));
 
   // Compare with the previous (should use same dictionary for gs)
   EXPECT_EQ(pathString.GetLength() + 7, pathString2.GetLength());
@@ -302,8 +304,8 @@ TEST_F(CPDF_PageContentGeneratorTest, ProcessFormWithPath) {
   pDoc->CreateNewDoc();
   auto pDict = pdfium::MakeUnique<CPDF_Dictionary>();
   const char content[] =
-      "q 3.102 4.67 m 5.45 0.29 l 4.24 3.15 4.65 2.98 3.456 0.24 c 3.102 4.67 "
-      "l h f Q\n";
+      "q 1 0 0 1 0 0 cm 3.102 4.67 m 5.45 0.29 l 4.24 3.15 4.65 2.98 3.456 "
+      "0.24 c 3.102 4.67 l h f Q\n";
   size_t buf_len = FX_ArraySize(content);
   std::unique_ptr<uint8_t, FxFreeDeleter> buf(FX_Alloc(uint8_t, buf_len));
   memcpy(buf.get(), content, buf_len);