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/render/cpdf_type3cache.h"
8
9 #include <map>
10 #include <memory>
11 #include <utility>
12
13 #include "core/fpdfapi/font/cpdf_type3char.h"
14 #include "core/fpdfapi/font/cpdf_type3font.h"
15 #include "core/fpdfapi/render/cpdf_type3glyphmap.h"
16 #include "core/fxcrt/fx_coordinates.h"
17 #include "core/fxcrt/fx_safe_types.h"
18 #include "core/fxge/cfx_glyphbitmap.h"
19 #include "core/fxge/dib/cfx_dibitmap.h"
20 #include "core/fxge/fx_dib.h"
21 #include "third_party/base/ptr_util.h"
22
23 namespace {
24
25 struct CPDF_UniqueKeyGen {
26 void Generate(int count, ...);
27
28 int m_KeyLen;
29 char m_Key[128];
30 };
31
Generate(int count,...)32 void CPDF_UniqueKeyGen::Generate(int count, ...) {
33 va_list argList;
34 va_start(argList, count);
35 for (int i = 0; i < count; i++) {
36 int p = va_arg(argList, int);
37 (reinterpret_cast<uint32_t*>(m_Key))[i] = p;
38 }
39 va_end(argList);
40 m_KeyLen = count * sizeof(uint32_t);
41 }
42
IsScanLine1bpp(uint8_t * pBuf,int width)43 bool IsScanLine1bpp(uint8_t* pBuf, int width) {
44 int size = width / 8;
45 for (int i = 0; i < size; i++) {
46 if (pBuf[i])
47 return true;
48 }
49 return (width % 8) && (pBuf[width / 8] & (0xff << (8 - width % 8)));
50 }
51
IsScanLine8bpp(uint8_t * pBuf,int width)52 bool IsScanLine8bpp(uint8_t* pBuf, int width) {
53 for (int i = 0; i < width; i++) {
54 if (pBuf[i] > 0x40)
55 return true;
56 }
57 return false;
58 }
59
DetectFirstLastScan(const RetainPtr<CFX_DIBitmap> & pBitmap,bool bFirst)60 int DetectFirstLastScan(const RetainPtr<CFX_DIBitmap>& pBitmap, bool bFirst) {
61 int height = pBitmap->GetHeight();
62 int pitch = pBitmap->GetPitch();
63 int width = pBitmap->GetWidth();
64 int bpp = pBitmap->GetBPP();
65 if (bpp > 8)
66 width *= bpp / 8;
67 uint8_t* pBuf = pBitmap->GetBuffer();
68 int line = bFirst ? 0 : height - 1;
69 int line_step = bFirst ? 1 : -1;
70 int line_end = bFirst ? height : -1;
71 while (line != line_end) {
72 if (bpp == 1) {
73 if (IsScanLine1bpp(pBuf + line * pitch, width))
74 return line;
75 } else {
76 if (IsScanLine8bpp(pBuf + line * pitch, width))
77 return line;
78 }
79 line += line_step;
80 }
81 return -1;
82 }
83
84 } // namespace
85
CPDF_Type3Cache(CPDF_Type3Font * pFont)86 CPDF_Type3Cache::CPDF_Type3Cache(CPDF_Type3Font* pFont) : m_pFont(pFont) {}
87
88 CPDF_Type3Cache::~CPDF_Type3Cache() = default;
89
LoadGlyph(uint32_t charcode,const CFX_Matrix * pMatrix)90 const CFX_GlyphBitmap* CPDF_Type3Cache::LoadGlyph(uint32_t charcode,
91 const CFX_Matrix* pMatrix) {
92 CPDF_UniqueKeyGen keygen;
93 keygen.Generate(
94 4, FXSYS_roundf(pMatrix->a * 10000), FXSYS_roundf(pMatrix->b * 10000),
95 FXSYS_roundf(pMatrix->c * 10000), FXSYS_roundf(pMatrix->d * 10000));
96 ByteString FaceGlyphsKey(keygen.m_Key, keygen.m_KeyLen);
97 CPDF_Type3GlyphMap* pSizeCache;
98 auto it = m_SizeMap.find(FaceGlyphsKey);
99 if (it == m_SizeMap.end()) {
100 auto pNew = pdfium::MakeUnique<CPDF_Type3GlyphMap>();
101 pSizeCache = pNew.get();
102 m_SizeMap[FaceGlyphsKey] = std::move(pNew);
103 } else {
104 pSizeCache = it->second.get();
105 }
106 const CFX_GlyphBitmap* pExisting = pSizeCache->GetBitmap(charcode);
107 if (pExisting)
108 return pExisting;
109
110 std::unique_ptr<CFX_GlyphBitmap> pNewBitmap =
111 RenderGlyph(pSizeCache, charcode, pMatrix);
112 CFX_GlyphBitmap* pGlyphBitmap = pNewBitmap.get();
113 pSizeCache->SetBitmap(charcode, std::move(pNewBitmap));
114 return pGlyphBitmap;
115 }
116
RenderGlyph(CPDF_Type3GlyphMap * pSize,uint32_t charcode,const CFX_Matrix * pMatrix)117 std::unique_ptr<CFX_GlyphBitmap> CPDF_Type3Cache::RenderGlyph(
118 CPDF_Type3GlyphMap* pSize,
119 uint32_t charcode,
120 const CFX_Matrix* pMatrix) {
121 const CPDF_Type3Char* pChar = m_pFont->LoadChar(charcode);
122 if (!pChar || !pChar->GetBitmap())
123 return nullptr;
124
125 CFX_Matrix text_matrix(pMatrix->a, pMatrix->b, pMatrix->c, pMatrix->d, 0, 0);
126 CFX_Matrix image_matrix = pChar->matrix() * text_matrix;
127
128 RetainPtr<CFX_DIBitmap> pBitmap = pChar->GetBitmap();
129 RetainPtr<CFX_DIBitmap> pResBitmap;
130 int left = 0;
131 int top = 0;
132 if (fabs(image_matrix.b) < fabs(image_matrix.a) / 100 &&
133 fabs(image_matrix.c) < fabs(image_matrix.d) / 100) {
134 int top_line = DetectFirstLastScan(pBitmap, true);
135 int bottom_line = DetectFirstLastScan(pBitmap, false);
136 if (top_line == 0 && bottom_line == pBitmap->GetHeight() - 1) {
137 float top_y = image_matrix.d + image_matrix.f;
138 float bottom_y = image_matrix.f;
139 bool bFlipped = top_y > bottom_y;
140 if (bFlipped)
141 std::swap(top_y, bottom_y);
142 std::tie(top_line, bottom_line) = pSize->AdjustBlue(top_y, bottom_y);
143 FX_SAFE_INT32 safe_height = bFlipped ? top_line : bottom_line;
144 safe_height -= bFlipped ? bottom_line : top_line;
145 if (!safe_height.IsValid())
146 return nullptr;
147
148 pResBitmap = pBitmap->StretchTo(static_cast<int>(image_matrix.a),
149 safe_height.ValueOrDie(),
150 FXDIB_ResampleOptions(), nullptr);
151 top = top_line;
152 if (image_matrix.a < 0)
153 left = FXSYS_roundf(image_matrix.e + image_matrix.a);
154 else
155 left = FXSYS_roundf(image_matrix.e);
156 }
157 }
158 if (!pResBitmap)
159 pResBitmap = pBitmap->TransformTo(image_matrix, &left, &top);
160 if (!pResBitmap)
161 return nullptr;
162
163 auto pGlyph = pdfium::MakeUnique<CFX_GlyphBitmap>(left, -top);
164 pGlyph->GetBitmap()->TakeOver(std::move(pResBitmap));
165 return pGlyph;
166 }
167