1 // Copyright 2014 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 <algorithm>
8 #include <limits>
9 #include <vector>
10
11 #include "core/fxcrt/fx_safe_types.h"
12 #include "core/fxge/cfx_pathdata.h"
13 #include "core/fxge/fx_font.h"
14 #include "core/fxge/fx_freetype.h"
15 #include "core/fxge/ifx_renderdevicedriver.h"
16
17 namespace {
18
ResetTransform(FT_Face face)19 void ResetTransform(FT_Face face) {
20 FXFT_Matrix matrix;
21 matrix.xx = 0x10000L;
22 matrix.xy = 0;
23 matrix.yx = 0;
24 matrix.yy = 0x10000L;
25 FXFT_Set_Transform(face, &matrix, 0);
26 }
27
28 } // namespace
29
FXTEXT_GLYPHPOS()30 FXTEXT_GLYPHPOS::FXTEXT_GLYPHPOS() : m_pGlyph(nullptr) {}
31
32 FXTEXT_GLYPHPOS::FXTEXT_GLYPHPOS(const FXTEXT_GLYPHPOS&) = default;
33
~FXTEXT_GLYPHPOS()34 FXTEXT_GLYPHPOS::~FXTEXT_GLYPHPOS(){};
35
ScopedFontTransform(FT_Face face,FXFT_Matrix * matrix)36 ScopedFontTransform::ScopedFontTransform(FT_Face face, FXFT_Matrix* matrix)
37 : m_Face(face) {
38 FXFT_Set_Transform(m_Face, matrix, 0);
39 }
40
~ScopedFontTransform()41 ScopedFontTransform::~ScopedFontTransform() {
42 ResetTransform(m_Face);
43 }
44
FXGE_GetGlyphsBBox(const std::vector<FXTEXT_GLYPHPOS> & glyphs,int anti_alias,float retinaScaleX,float retinaScaleY)45 FX_RECT FXGE_GetGlyphsBBox(const std::vector<FXTEXT_GLYPHPOS>& glyphs,
46 int anti_alias,
47 float retinaScaleX,
48 float retinaScaleY) {
49 FX_RECT rect(0, 0, 0, 0);
50 bool bStarted = false;
51 for (const FXTEXT_GLYPHPOS& glyph : glyphs) {
52 const CFX_GlyphBitmap* pGlyph = glyph.m_pGlyph;
53 if (!pGlyph)
54 continue;
55
56 FX_SAFE_INT32 char_left = glyph.m_Origin.x;
57 char_left += pGlyph->m_Left;
58 if (!char_left.IsValid())
59 continue;
60
61 FX_SAFE_INT32 char_width = pGlyph->m_pBitmap->GetWidth();
62 char_width /= retinaScaleX;
63 if (anti_alias == FXFT_RENDER_MODE_LCD)
64 char_width /= 3;
65 if (!char_width.IsValid())
66 continue;
67
68 FX_SAFE_INT32 char_right = char_left + char_width;
69 if (!char_right.IsValid())
70 continue;
71
72 FX_SAFE_INT32 char_top = glyph.m_Origin.y;
73 char_top -= pGlyph->m_Top;
74 if (!char_top.IsValid())
75 continue;
76
77 FX_SAFE_INT32 char_height = pGlyph->m_pBitmap->GetHeight();
78 char_height /= retinaScaleY;
79 if (!char_height.IsValid())
80 continue;
81
82 FX_SAFE_INT32 char_bottom = char_top + char_height;
83 if (!char_bottom.IsValid())
84 continue;
85
86 if (bStarted) {
87 rect.left = pdfium::base::ValueOrDieForType<int32_t>(
88 pdfium::base::CheckMin(rect.left, char_left));
89 rect.right = pdfium::base::ValueOrDieForType<int32_t>(
90 pdfium::base::CheckMax(rect.right, char_right));
91 rect.top = pdfium::base::ValueOrDieForType<int32_t>(
92 pdfium::base::CheckMin(rect.top, char_top));
93 rect.bottom = pdfium::base::ValueOrDieForType<int32_t>(
94 pdfium::base::CheckMax(rect.bottom, char_bottom));
95 continue;
96 }
97
98 rect.left = char_left.ValueOrDie();
99 rect.right = char_right.ValueOrDie();
100 rect.top = char_top.ValueOrDie();
101 rect.bottom = char_bottom.ValueOrDie();
102 bStarted = true;
103 }
104 return rect;
105 }
106