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>
diff --git a/fpdfsdk/fpdfedittext.cpp b/fpdfsdk/fpdfedittext.cpp
index 79ca310..8bf0a0a 100644
--- a/fpdfsdk/fpdfedittext.cpp
+++ b/fpdfsdk/fpdfedittext.cpp
@@ -2,12 +2,23 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-#include "public/fpdf_edit.h"
+#include <utility>
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_font.h"
+#include "core/fpdfapi/font/cpdf_type1font.h"
#include "core/fpdfapi/page/cpdf_textobject.h"
+#include "core/fpdfapi/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/parser/cpdf_name.h"
+#include "core/fpdfapi/parser/cpdf_number.h"
+#include "core/fpdfapi/parser/cpdf_reference.h"
+#include "core/fpdfapi/parser/cpdf_stream.h"
+#include "core/fxge/cfx_fontmgr.h"
+#include "core/fxge/fx_font.h"
#include "fpdfsdk/fsdk_define.h"
+#include "public/fpdf_edit.h"
DLLEXPORT FPDF_PAGEOBJECT STDCALL FPDFPageObj_NewTextObj(FPDF_DOCUMENT document,
FPDF_BYTESTRING font,
@@ -35,4 +46,87 @@
auto pTextObj = reinterpret_cast<CPDF_TextObject*>(text_object);
pTextObj->SetText(CFX_ByteString(text));
return true;
-}
\ No newline at end of file
+}
+
+DLLEXPORT FPDF_FONT STDCALL FPDFText_LoadType1Font(FPDF_DOCUMENT document,
+ const uint8_t* data,
+ uint32_t size) {
+ CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+ if (!pDoc || !data || size == 0)
+ return nullptr;
+
+ auto pFont = pdfium::MakeUnique<CFX_Font>();
+
+ // TODO(npm): Maybe use FT_Get_X11_Font_Format to check format?
+ if (!pFont->LoadEmbedded(data, size))
+ return nullptr;
+
+ CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
+ fontDict->SetNewFor<CPDF_Name>("Type", "Font");
+ fontDict->SetNewFor<CPDF_Name>("Subtype", "Type1");
+ CFX_ByteString name = pFont->GetFaceName();
+ if (name.IsEmpty())
+ name = "Unnamed";
+ fontDict->SetNewFor<CPDF_Name>("BaseFont", name);
+
+ uint32_t glyphIndex;
+ int currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
+ fontDict->SetNewFor<CPDF_Number>("FirstChar", currentChar);
+ int nextChar;
+ CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
+ while (true) {
+ int width = pFont->GetGlyphWidth(glyphIndex);
+ widthsArray->AddNew<CPDF_Number>(width);
+ nextChar = FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
+ if (glyphIndex == 0)
+ break;
+ for (int i = currentChar + 1; i < nextChar; i++)
+ widthsArray->AddNew<CPDF_Number>(0);
+ currentChar = nextChar;
+ }
+ fontDict->SetNewFor<CPDF_Number>("LastChar", currentChar);
+ fontDict->SetNewFor<CPDF_Reference>("Widths", pDoc, widthsArray->GetObjNum());
+ CPDF_Dictionary* fontDesc = pDoc->NewIndirect<CPDF_Dictionary>();
+ fontDesc->SetNewFor<CPDF_Name>("Type", "FontDescriptor");
+ fontDesc->SetNewFor<CPDF_Name>("FontName", name);
+ int flags = 0;
+ if (FXFT_Is_Face_fixedwidth(pFont->GetFace()))
+ flags |= FXFONT_FIXED_PITCH;
+ if (name.Find("Serif") > -1)
+ flags |= FXFONT_SERIF;
+ if (FXFT_Is_Face_Italic(pFont->GetFace()))
+ flags |= FXFONT_ITALIC;
+ if (FXFT_Is_Face_Bold(pFont->GetFace()))
+ flags |= FXFONT_BOLD;
+
+ // TODO(npm): How do I know if a Type1 font is symbolic, script, allcap,
+ // smallcap
+ flags |= FXFONT_NONSYMBOLIC;
+
+ fontDesc->SetNewFor<CPDF_Number>("Flags", flags);
+ FX_RECT bbox;
+ pFont->GetBBox(bbox);
+ auto pBBox = pdfium::MakeUnique<CPDF_Array>();
+ pBBox->AddNew<CPDF_Number>(bbox.left);
+ pBBox->AddNew<CPDF_Number>(bbox.bottom);
+ pBBox->AddNew<CPDF_Number>(bbox.right);
+ pBBox->AddNew<CPDF_Number>(bbox.top);
+ fontDesc->SetFor("FontBBox", std::move(pBBox));
+
+ // TODO(npm): calculate italic angle correctly
+ fontDesc->SetNewFor<CPDF_Number>("ItalicAngle", pFont->IsItalic() ? -12 : 0);
+
+ fontDesc->SetNewFor<CPDF_Number>("Ascent", pFont->GetAscent());
+ fontDesc->SetNewFor<CPDF_Number>("Descent", pFont->GetDescent());
+
+ // TODO(npm): calculate the capheight, stemV correctly
+ fontDesc->SetNewFor<CPDF_Number>("CapHeight", pFont->GetAscent());
+ fontDesc->SetNewFor<CPDF_Number>("StemV", pFont->IsBold() ? 120 : 70);
+
+ CPDF_Stream* pStream = pDoc->NewIndirect<CPDF_Stream>();
+ pStream->SetData(data, size);
+ fontDesc->SetNewFor<CPDF_Reference>("FontFile", pDoc, pStream->GetObjNum());
+ fontDict->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
+ fontDesc->GetObjNum());
+ return pDoc->LoadFont(fontDict);
+}