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      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 
     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 
     30 FXTEXT_GLYPHPOS::FXTEXT_GLYPHPOS() : m_pGlyph(nullptr) {}
     31 
     32 FXTEXT_GLYPHPOS::FXTEXT_GLYPHPOS(const FXTEXT_GLYPHPOS&) = default;
     33 
     34 FXTEXT_GLYPHPOS::~FXTEXT_GLYPHPOS(){};
     35 
     36 ScopedFontTransform::ScopedFontTransform(FT_Face face, FXFT_Matrix* matrix)
     37     : m_Face(face) {
     38   FXFT_Set_Transform(m_Face, matrix, 0);
     39 }
     40 
     41 ScopedFontTransform::~ScopedFontTransform() {
     42   ResetTransform(m_Face);
     43 }
     44 
     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