Calculate AP for multi-line markup annotations correctly

Currently, when constructing AP for multi-line markup annotations, we
only take into account the first set of quadpoints, resulting in only
the first line of the annotation being displayed if the annotation spans
multiple lines.

This CL, initially written by Jane Liu <janeliulwq@google.com>
(https://pdfium-review.googlesource.com/12010) takes into account all
the quadpoints, so multi-line annotations can be displayed correctly.

BUG=pdfium:876

Change-Id: I8be10ee38e01eb6525ddef556df1b727189455c7
Reviewed-on: https://pdfium-review.googlesource.com/28590
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/fpdfsdk/fpdfannot_embeddertest.cpp b/fpdfsdk/fpdfannot_embeddertest.cpp
index 61cd2aae3d..b96460a395 100644
--- a/fpdfsdk/fpdfannot_embeddertest.cpp
+++ b/fpdfsdk/fpdfannot_embeddertest.cpp
@@ -45,6 +45,20 @@ TEST_F(FPDFAnnotEmbeddertest, RenderAnnotWithOnlyRolloverAP) {
   UnloadPage(page);
 }
 
+TEST_F(FPDFAnnotEmbeddertest, RenderMultilineMarkupAnnotWithoutAP) {
+  const char md5_hash[] = "76512832d88017668d9acc7aacd13dae";
+  // Open a file with two multiline markup annotations.
+  ASSERT_TRUE(OpenDocument("annotation_markup_multiline_no_ap.pdf"));
+  FPDF_PAGE page = LoadPage(0);
+  ASSERT_TRUE(page);
+
+  std::unique_ptr<void, FPDFBitmapDeleter> bitmap =
+      RenderLoadedPageWithFlags(page, FPDF_ANNOT);
+  CompareBitmap(bitmap.get(), 595, 842, md5_hash);
+
+  UnloadPage(page);
+}
+
 TEST_F(FPDFAnnotEmbeddertest, ExtractHighlightLongContent) {
   // Open a file with one annotation and load its first page.
   ASSERT_TRUE(OpenDocument("annotation_highlight_long_content.pdf"));