Add FPDFText_GetMatrix() API

This is similar to FPDFPath_GetMatrix(), but works on text, not path
objects.

Change-Id: If268362b7fa4398124b953e0e2225074523f5f65
Reviewed-on: https://pdfium-review.googlesource.com/35434
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/fpdfsdk/fpdf_edittext.cpp b/fpdfsdk/fpdf_edittext.cpp
index 8186d8d894..a927e16e14 100644
--- a/fpdfsdk/fpdf_edittext.cpp
+++ b/fpdfsdk/fpdf_edittext.cpp
@@ -394,6 +394,11 @@ CPDF_Font* LoadCompositeFont(CPDF_Document* pDoc,
   return pDoc->LoadFont(fontDict);
 }
 
+CPDF_TextObject* CPDFTextObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object) {
+  auto* obj = CPDFPageObjectFromFPDFPageObject(page_object);
+  return obj ? obj->AsText() : nullptr;
+}
+
 }  // namespace
 
 FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
@@ -481,6 +486,31 @@ FPDFText_SetFillColor(FPDF_PAGEOBJECT text_object,
   return FPDFPageObj_SetFillColor(text_object, R, G, B, A);
 }
 
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetMatrix(FPDF_PAGEOBJECT text,
+                                                       double* a,
+                                                       double* b,
+                                                       double* c,
+                                                       double* d,
+                                                       double* e,
+                                                       double* f) {
+  if (!text || !a || !b || !c || !d || !e || !f)
+    return false;
+
+  CPDF_TextObject* pTextObj = CPDFTextObjectFromFPDFPageObject(text);
+  if (!pTextObj)
+    return false;
+
+  CFX_Matrix text_matrix = pTextObj->GetTextMatrix();
+  *a = text_matrix.a;
+  *b = text_matrix.b;
+  *c = text_matrix.c;
+  *d = text_matrix.d;
+  *e = text_matrix.e;
+  *f = text_matrix.f;
+
+  return true;
+}
+
 FPDF_EXPORT void FPDF_CALLCONV FPDFFont_Close(FPDF_FONT font) {
   CPDF_Font* pFont = CPDFFontFromFPDFFont(font);
   if (!pFont)