Add FPDFText_GetTextRenderMode() API

This allows deciding if FPDFPageObj_GetFillColor() or
FPDFPageObj_GetStrokeColor() should be used to get the effective color
of a text object.

Change-Id: Ic6e99a9eb8512b164756da8b5fcd8cd7771271ae
Reviewed-on: https://pdfium-review.googlesource.com/36750
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

3 files changed, 55 insertions, 0 deletions

diff --git a/fpdfsdk/fpdf_edit_embeddertest.cpp b/fpdfsdk/fpdf_edit_embeddertest.cpp
index 9464417da1..445b0cc6b9 100644
--- a/fpdfsdk/fpdf_edit_embeddertest.cpp
+++ b/fpdfsdk/fpdf_edit_embeddertest.cpp
@@ -1487,6 +1487,23 @@ TEST_F(FPDFEditEmbeddertest, AddStandardFontText) {
   FPDF_ClosePage(page);
 }
 
+TEST_F(FPDFEditEmbeddertest, TestGetTextRenderMode) {
+  EXPECT_TRUE(OpenDocument("text_render_mode.pdf"));
+  FPDF_PAGE page = LoadPage(0);
+  ASSERT_TRUE(page);
+  ASSERT_EQ(2, FPDFPage_CountObjects(page));
+
+  ASSERT_EQ(-1, FPDFText_GetTextRenderMode(nullptr));
+
+  FPDF_PAGEOBJECT fill = FPDFPage_GetObject(page, 0);
+  ASSERT_EQ(FPDF_TEXTRENDERMODE_FILL, FPDFText_GetTextRenderMode(fill));
+
+  FPDF_PAGEOBJECT stroke = FPDFPage_GetObject(page, 1);
+  ASSERT_EQ(FPDF_TEXTRENDERMODE_STROKE, FPDFText_GetTextRenderMode(stroke));
+
+  UnloadPage(page);
+}
+
 // Tests adding text from standard font using FPDFText_LoadStandardFont.
 TEST_F(FPDFEditEmbeddertest, AddStandardFontText2) {
   // Start with a blank page
diff --git a/fpdfsdk/fpdf_edittext.cpp b/fpdfsdk/fpdf_edittext.cpp
index 3115e2a16e..c552d615e4 100644
--- a/fpdfsdk/fpdf_edittext.cpp
+++ b/fpdfsdk/fpdf_edittext.cpp
@@ -14,6 +14,7 @@
 #include "core/fpdfapi/font/cpdf_type1font.h"
 #include "core/fpdfapi/page/cpdf_docpagedata.h"
 #include "core/fpdfapi/page/cpdf_textobject.h"
+#include "core/fpdfapi/page/cpdf_textstate.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_document.h"
@@ -27,6 +28,31 @@
 #include "fpdfsdk/cpdfsdk_helpers.h"
 #include "public/fpdf_edit.h"
 
+// These checks are here because core/ and public/ cannot depend on each other.
+static_assert(static_cast<int>(TextRenderingMode::MODE_FILL) ==
+                  FPDF_TEXTRENDERMODE_FILL,
+              "TextRenderingMode::MODE_FILL value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_STROKE) ==
+                  FPDF_TEXTRENDERMODE_STROKE,
+              "TextRenderingMode::MODE_STROKE value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_FILL_STROKE) ==
+                  FPDF_TEXTRENDERMODE_FILL_STROKE,
+              "TextRenderingMode::MODE_FILL_STROKE value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_INVISIBLE) ==
+                  FPDF_TEXTRENDERMODE_INVISIBLE,
+              "TextRenderingMode::MODE_INVISIBLE value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_FILL_CLIP) ==
+                  FPDF_TEXTRENDERMODE_FILL_CLIP,
+              "TextRenderingMode::MODE_FILL_CLIP value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_STROKE_CLIP) ==
+                  FPDF_TEXTRENDERMODE_STROKE_CLIP,
+              "TextRenderingMode::MODE_STROKE_CLIP value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_FILL_STROKE_CLIP) ==
+                  FPDF_TEXTRENDERMODE_FILL_STROKE_CLIP,
+              "TextRenderingMode::MODE_FILL_STROKE_CLIP value mismatch");
+static_assert(static_cast<int>(TextRenderingMode::MODE_CLIP) ==
+                  FPDF_TEXTRENDERMODE_CLIP,
+              "TextRenderingMode::MODE_CLIP value mismatch");
 namespace {
 
 CPDF_Dictionary* LoadFontDesc(CPDF_Document* pDoc,
@@ -545,3 +571,14 @@ FPDFPageObj_CreateTextObj(FPDF_DOCUMENT document,
   pTextObj->DefaultStates();
   return FPDFPageObjectFromCPDFPageObject(pTextObj.release());
 }
+
+FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetTextRenderMode(FPDF_PAGEOBJECT text) {
+  if (!text)
+    return -1;
+
+  CPDF_TextObject* pTextObj = CPDFTextObjectFromFPDFPageObject(text);
+  if (!pTextObj)
+    return -1;
+
+  return static_cast<int>(pTextObj->m_TextState.GetTextMode());
+}
diff --git a/fpdfsdk/fpdf_view_c_api_test.c b/fpdfsdk/fpdf_view_c_api_test.c
index 997423a4a8..1837b58e2a 100644
--- a/fpdfsdk/fpdf_view_c_api_test.c
+++ b/fpdfsdk/fpdf_view_c_api_test.c
@@ -197,6 +197,7 @@ int CheckPDFiumCApi() {
     CHK(FPDFPath_SetStrokeWidth);
     CHK(FPDFTextObj_GetFontSize);
     CHK(FPDFText_GetMatrix);
+    CHK(FPDFText_GetTextRenderMode);
     CHK(FPDFText_LoadFont);
     CHK(FPDFText_LoadStandardFont);
     CHK(FPDFText_SetFillColor);