1 // Copyright 2016 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #include "core/fpdfapi/font/cpdf_type3char.h"
8 
9 #include <utility>
10 
11 #include "core/fpdfapi/page/cpdf_form.h"
12 #include "core/fpdfapi/page/cpdf_image.h"
13 #include "core/fpdfapi/page/cpdf_imageobject.h"
14 #include "core/fpdfapi/page/cpdf_pageobject.h"
15 #include "core/fxge/dib/cfx_dibitmap.h"
16 #include "core/fxge/fx_dib.h"
17 
18 namespace {
19 
20 constexpr float kTextUnitInGlyphUnit = 1000.0f;
21 
22 }  // namespace
23 
CPDF_Type3Char(std::unique_ptr<CPDF_Form> pForm)24 CPDF_Type3Char::CPDF_Type3Char(std::unique_ptr<CPDF_Form> pForm)
25     : m_pForm(std::move(pForm)) {}
26 
~CPDF_Type3Char()27 CPDF_Type3Char::~CPDF_Type3Char() {}
28 
29 // static
TextUnitToGlyphUnit(float fTextUnit)30 float CPDF_Type3Char::TextUnitToGlyphUnit(float fTextUnit) {
31   return fTextUnit * kTextUnitInGlyphUnit;
32 }
33 
34 // static
TextUnitRectToGlyphUnitRect(CFX_FloatRect * pRect)35 void CPDF_Type3Char::TextUnitRectToGlyphUnitRect(CFX_FloatRect* pRect) {
36   pRect->Scale(kTextUnitInGlyphUnit);
37 }
38 
LoadBitmap(CPDF_RenderContext * pContext)39 bool CPDF_Type3Char::LoadBitmap(CPDF_RenderContext* pContext) {
40   if (m_pBitmap || !m_pForm)
41     return true;
42 
43   if (m_pForm->GetPageObjectList()->size() != 1 || m_bColored)
44     return false;
45 
46   auto& pPageObj = m_pForm->GetPageObjectList()->front();
47   if (!pPageObj->IsImage())
48     return false;
49 
50   m_ImageMatrix = pPageObj->AsImage()->matrix();
51   {
52     // |pSource| actually gets assigned a CPDF_DIBSource, which has pointers
53     // into objects owned by |m_pForm|. Make sure it is out of scope before
54     // clearing the form.
55     RetainPtr<CFX_DIBSource> pSource =
56         pPageObj->AsImage()->GetImage()->LoadDIBSource();
57 
58     // Clone() is non-virtual, and can't be overloaded by CPDF_DIBSource to
59     // return a clone of the subclass as one would typically expect from a
60     // such a method. Instead, it only clones the CFX_DIBSource, none of whose
61     // members point to objects owned by the form. As a result, |m_pBitmap|
62     // may outlive |m_pForm|.
63     if (pSource)
64       m_pBitmap = pSource->Clone(nullptr);
65   }
66   m_pForm.reset();
67   return true;
68 }
69 
InitializeFromStreamData(bool bColored,const float * pData)70 void CPDF_Type3Char::InitializeFromStreamData(bool bColored,
71                                               const float* pData) {
72   m_bColored = bColored;
73   m_Width = FXSYS_round(TextUnitToGlyphUnit(pData[0]));
74   m_BBox.left = FXSYS_round(TextUnitToGlyphUnit(pData[2]));
75   m_BBox.bottom = FXSYS_round(TextUnitToGlyphUnit(pData[3]));
76   m_BBox.right = FXSYS_round(TextUnitToGlyphUnit(pData[4]));
77   m_BBox.top = FXSYS_round(TextUnitToGlyphUnit(pData[5]));
78 }
79 
Transform(const CFX_Matrix & matrix)80 void CPDF_Type3Char::Transform(const CFX_Matrix& matrix) {
81   m_Width = m_Width * matrix.GetXUnit() + 0.5f;
82 
83   CFX_FloatRect char_rect;
84   if (m_BBox.right <= m_BBox.left || m_BBox.bottom >= m_BBox.top) {
85     char_rect = form()->CalcBoundingBox();
86     TextUnitRectToGlyphUnitRect(&char_rect);
87   } else {
88     char_rect = CFX_FloatRect(m_BBox);
89   }
90 
91   m_BBox = matrix.TransformRect(char_rect).ToRoundedFxRect();
92 }
93 
ResetForm()94 void CPDF_Type3Char::ResetForm() {
95   m_pForm.reset();
96 }
97 
GetBitmap()98 RetainPtr<CFX_DIBitmap> CPDF_Type3Char::GetBitmap() {
99   return m_pBitmap;
100 }
101 
GetBitmap() const102 const RetainPtr<CFX_DIBitmap>& CPDF_Type3Char::GetBitmap() const {
103   return m_pBitmap;
104 }
105