Add public API for creating a Type1 font

Given a stream of data, we create a type1 font and fill up the required
dictionary entries according to PDF spec 1.7. Table 5.8 describes Type 1 font
dictionaries, and Table 5.19 describes font descriptors.

BUG=pdfium:667

Change-Id: I571b09fb533467d77ed0104e613726387aec1f87
Reviewed-on: https://pdfium-review.googlesource.com/2835
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/fpdfsdk/fpdfedit_embeddertest.cpp b/fpdfsdk/fpdfedit_embeddertest.cpp
index f877617b49..53554a1822 100644
--- a/fpdfsdk/fpdfedit_embeddertest.cpp
+++ b/fpdfsdk/fpdfedit_embeddertest.cpp
@@ -5,8 +5,11 @@
 #include <memory>
 #include <string>
 
+#include "core/fpdfapi/font/cpdf_font.h"
 #include "core/fpdfapi/page/cpdf_page.h"
+#include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_stream.h"
 #include "core/fxcrt/fx_system.h"
 #include "fpdfsdk/fsdk_define.h"
 #include "public/fpdf_edit.h"
@@ -440,3 +443,63 @@ TEST_F(FPDFEditEmbeddertest, DoubleGenerating) {
   FPDF_ClosePage(page);
   FPDF_CloseDocument(doc);
 }
+
+TEST_F(FPDFEditEmbeddertest, Type1Font) {
+  // Create a new document
+  FPDF_DOCUMENT doc = FPDF_CreateNewDocument();
+  CPDF_Document* document = reinterpret_cast<CPDF_Document*>(doc);
+
+  // Get Times New Roman Bold as a Type 1 font
+  CPDF_Font* times_bold = CPDF_Font::GetStockFont(document, "Times-Bold");
+  uint8_t* data = times_bold->m_Font.GetFontData();
+  uint32_t size = times_bold->m_Font.GetSize();
+  FPDF_FONT font = FPDFText_LoadType1Font(doc, data, size);
+  ASSERT_TRUE(font);
+  CPDF_Font* type1_font = reinterpret_cast<CPDF_Font*>(font);
+  EXPECT_TRUE(type1_font->IsType1Font());
+
+  // Check that the font dictionary has the required keys according to the spec
+  CPDF_Dictionary* font_dict = type1_font->GetFontDict();
+  EXPECT_EQ("Font", font_dict->GetStringFor("Type"));
+  EXPECT_EQ("Type1", font_dict->GetStringFor("Subtype"));
+  EXPECT_EQ("Times New Roman Bold", font_dict->GetStringFor("BaseFont"));
+  ASSERT_TRUE(font_dict->KeyExist("FirstChar"));
+  ASSERT_TRUE(font_dict->KeyExist("LastChar"));
+  EXPECT_EQ(32, font_dict->GetIntegerFor("FirstChar"));
+  EXPECT_EQ(65532, font_dict->GetIntegerFor("LastChar"));
+  ASSERT_TRUE(font_dict->KeyExist("Widths"));
+  CPDF_Array* widths_array = font_dict->GetArrayFor("Widths");
+  EXPECT_EQ(65501U, widths_array->GetCount());
+  EXPECT_EQ(250, widths_array->GetNumberAt(0));
+  EXPECT_EQ(0, widths_array->GetNumberAt(8172));
+  EXPECT_EQ(1000, widths_array->GetNumberAt(65500));
+  ASSERT_TRUE(font_dict->KeyExist("FontDescriptor"));
+  CPDF_Dictionary* font_desc = font_dict->GetDictFor("FontDescriptor");
+  EXPECT_EQ("FontDescriptor", font_desc->GetStringFor("Type"));
+  EXPECT_EQ(font_dict->GetStringFor("BaseFont"),
+            font_desc->GetStringFor("FontName"));
+
+  // Check that the font descriptor has the required keys according to the spec
+  ASSERT_TRUE(font_desc->KeyExist("Flags"));
+  int font_flags = font_desc->GetIntegerFor("Flags");
+  EXPECT_TRUE(font_flags & FXFONT_BOLD);
+  EXPECT_TRUE(font_flags & FXFONT_NONSYMBOLIC);
+  ASSERT_TRUE(font_desc->KeyExist("FontBBox"));
+  EXPECT_EQ(4U, font_desc->GetArrayFor("FontBBox")->GetCount());
+  EXPECT_TRUE(font_desc->KeyExist("ItalicAngle"));
+  EXPECT_TRUE(font_desc->KeyExist("Ascent"));
+  EXPECT_TRUE(font_desc->KeyExist("Descent"));
+  EXPECT_TRUE(font_desc->KeyExist("CapHeight"));
+  EXPECT_TRUE(font_desc->KeyExist("StemV"));
+  ASSERT_TRUE(font_desc->KeyExist("FontFile"));
+
+  // Check that the font stream is the one that was provided
+  CPDF_Stream* font_stream = font_desc->GetStreamFor("FontFile");
+  ASSERT_EQ(size, font_stream->GetRawSize());
+  uint8_t* stream_data = font_stream->GetRawData();
+  for (size_t i = 0; i < size; i++)
+    EXPECT_EQ(data[i], stream_data[i]);
+
+  // Close document
+  FPDF_CloseDocument(doc);
+}