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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfapi/font/cpdf_type3font.h"
#include <algorithm>
#include <utility>
#include "core/fpdfapi/font/cpdf_type3char.h"
#include "core/fpdfapi/page/cpdf_form.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 "third_party/base/stl_util.h"
namespace {
constexpr int kMaxType3FormLevel = 4;
} // namespace
CPDF_Type3Font::CPDF_Type3Font() {
memset(m_CharWidthL, 0, sizeof(m_CharWidthL));
}
CPDF_Type3Font::~CPDF_Type3Font() {}
bool CPDF_Type3Font::IsType3Font() const {
return true;
}
const CPDF_Type3Font* CPDF_Type3Font::AsType3Font() const {
return this;
}
CPDF_Type3Font* CPDF_Type3Font::AsType3Font() {
return this;
}
bool CPDF_Type3Font::Load() {
m_pFontResources = m_pFontDict->GetDictFor("Resources");
CPDF_Array* pMatrix = m_pFontDict->GetArrayFor("FontMatrix");
float xscale = 1.0f;
float yscale = 1.0f;
if (pMatrix) {
m_FontMatrix = pMatrix->GetMatrix();
xscale = m_FontMatrix.a;
yscale = m_FontMatrix.d;
}
CPDF_Array* pBBox = m_pFontDict->GetArrayFor("FontBBox");
if (pBBox) {
CFX_FloatRect box(
pBBox->GetNumberAt(0) * xscale, pBBox->GetNumberAt(1) * yscale,
pBBox->GetNumberAt(2) * xscale, pBBox->GetNumberAt(3) * yscale);
CPDF_Type3Char::TextUnitRectToGlyphUnitRect(&box);
m_FontBBox = box.ToFxRect();
}
static constexpr size_t kCharLimit = FX_ArraySize(m_CharWidthL);
int StartChar = m_pFontDict->GetIntegerFor("FirstChar");
if (StartChar >= 0 && static_cast<size_t>(StartChar) < kCharLimit) {
CPDF_Array* pWidthArray = m_pFontDict->GetArrayFor("Widths");
if (pWidthArray) {
size_t count = std::min(pWidthArray->GetCount(), kCharLimit);
count = std::min(count, kCharLimit - StartChar);
for (size_t i = 0; i < count; i++) {
m_CharWidthL[StartChar + i] =
FXSYS_round(CPDF_Type3Char::TextUnitToGlyphUnit(
pWidthArray->GetNumberAt(i) * xscale));
}
}
}
m_pCharProcs = m_pFontDict->GetDictFor("CharProcs");
CPDF_Object* pEncoding = m_pFontDict->GetDirectObjectFor("Encoding");
if (pEncoding)
LoadPDFEncoding(pEncoding, m_BaseEncoding, &m_CharNames, false, false);
return true;
}
void CPDF_Type3Font::LoadGlyphMap() {}
void CPDF_Type3Font::CheckType3FontMetrics() {
CheckFontMetrics();
}
CPDF_Type3Char* CPDF_Type3Font::LoadChar(uint32_t charcode) {
if (m_CharLoadingDepth >= kMaxType3FormLevel)
return nullptr;
auto it = m_CacheMap.find(charcode);
if (it != m_CacheMap.end())
return it->second.get();
const char* name = GetAdobeCharName(m_BaseEncoding, m_CharNames, charcode);
if (!name)
return nullptr;
CPDF_Stream* pStream =
ToStream(m_pCharProcs ? m_pCharProcs->GetDirectObjectFor(name) : nullptr);
if (!pStream)
return nullptr;
auto pNewChar =
pdfium::MakeUnique<CPDF_Type3Char>(pdfium::MakeUnique<CPDF_Form>(
m_pDocument.Get(),
m_pFontResources ? m_pFontResources.Get() : m_pPageResources.Get(),
pStream, nullptr));
// This can trigger recursion into this method. The content of |m_CacheMap|
// can change as a result. Thus after it returns, check the cache again for
// a cache hit.
m_CharLoadingDepth++;
pNewChar->form()->ParseContentWithParams(nullptr, nullptr, pNewChar.get(),
nullptr);
m_CharLoadingDepth--;
it = m_CacheMap.find(charcode);
if (it != m_CacheMap.end())
return it->second.get();
pNewChar->Transform(m_FontMatrix);
m_CacheMap[charcode] = std::move(pNewChar);
CPDF_Type3Char* pCachedChar = m_CacheMap[charcode].get();
if (pCachedChar->form()->GetPageObjectList()->empty())
pCachedChar->ResetForm();
return pCachedChar;
}
int CPDF_Type3Font::GetCharWidthF(uint32_t charcode) {
if (charcode >= FX_ArraySize(m_CharWidthL))
charcode = 0;
if (m_CharWidthL[charcode])
return m_CharWidthL[charcode];
const CPDF_Type3Char* pChar = LoadChar(charcode);
return pChar ? pChar->width() : 0;
}
FX_RECT CPDF_Type3Font::GetCharBBox(uint32_t charcode) {
FX_RECT ret;
const CPDF_Type3Char* pChar = LoadChar(charcode);
if (pChar)
ret = pChar->bbox();
return ret;
}
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