Add TransFormWithClipAndSave embedder test.
Further exercise FPDFPage_TransFormWithClip() and make sure it renders
correctly upon saving. This test also uncovers a bug with the effect of
FPDFPage_TransFormWithClip() on the in-memory document.
BUG=pdfium:1328
Change-Id: I3317c868540cb22547c344c2875bce1155eb68ed
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/56233
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/fpdf_transformpage_embeddertest.cpp b/fpdfsdk/fpdf_transformpage_embeddertest.cpp
index 212649c..db8e516 100644
--- a/fpdfsdk/fpdf_transformpage_embeddertest.cpp
+++ b/fpdfsdk/fpdf_transformpage_embeddertest.cpp
@@ -393,3 +393,60 @@
UnloadPage(page);
}
+
+TEST_F(FPDFTransformEmbedderTest, TransFormWithClipAndSave) {
+ const char kOriginalMD5[] = "0a90de37f52127619c3dfb642b5fa2fe";
+ const char kShrunkMD5[] = "f4136cc9209207ab60eb8381a3df2e69";
+
+ {
+ ASSERT_TRUE(OpenDocument("rectangles.pdf"));
+ FPDF_PAGE page = LoadPage(0);
+ ASSERT_TRUE(page);
+
+ {
+ // Render the page as is.
+ const int page_width = static_cast<int>(FPDF_GetPageWidth(page));
+ const int page_height = static_cast<int>(FPDF_GetPageHeight(page));
+ EXPECT_EQ(200, page_width);
+ EXPECT_EQ(300, page_height);
+ ScopedFPDFBitmap bitmap = RenderLoadedPage(page);
+ CompareBitmap(bitmap.get(), page_width, page_height, kOriginalMD5);
+ }
+
+ {
+ // Render the page after transforming.
+ // Note that the change should affect the rendering, but does not.
+ // It should behaves just like the case below, rather than the case above.
+ // TODO(bug_1328): The checksum below should be |kShrunkMD5|.
+ const FS_MATRIX half_matrix{0.5, 0, 0, 0.5, 0, 0};
+ EXPECT_TRUE(FPDFPage_TransFormWithClip(page, &half_matrix, nullptr));
+ const int page_width = static_cast<int>(FPDF_GetPageWidth(page));
+ const int page_height = static_cast<int>(FPDF_GetPageHeight(page));
+ EXPECT_EQ(200, page_width);
+ EXPECT_EQ(300, page_height);
+ ScopedFPDFBitmap bitmap = RenderLoadedPage(page);
+ CompareBitmap(bitmap.get(), page_width, page_height, kOriginalMD5);
+ }
+
+ UnloadPage(page);
+ }
+
+ {
+ // Save a copy, open the copy, and render it.
+ // Note that it renders the transform.
+ EXPECT_TRUE(FPDF_SaveAsCopy(document(), this, 0));
+ ASSERT_TRUE(OpenSavedDocument());
+ FPDF_PAGE saved_page = LoadSavedPage(0);
+ ASSERT_TRUE(saved_page);
+
+ const int page_width = static_cast<int>(FPDF_GetPageWidth(saved_page));
+ const int page_height = static_cast<int>(FPDF_GetPageHeight(saved_page));
+ EXPECT_EQ(200, page_width);
+ EXPECT_EQ(300, page_height);
+ ScopedFPDFBitmap bitmap = RenderSavedPage(saved_page);
+ CompareBitmap(bitmap.get(), page_width, page_height, kShrunkMD5);
+
+ CloseSavedPage(saved_page);
+ CloseSavedDocument();
+ }
+}
