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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/render/cpdf_type3cache.h"
#include <map>
#include <memory>
#include <utility>
#include "core/fpdfapi/font/cpdf_type3char.h"
#include "core/fpdfapi/font/cpdf_type3font.h"
#include "core/fpdfapi/render/cpdf_type3glyphs.h"
#include "core/fxge/fx_dib.h"
#include "core/fxge/fx_font.h"
#include "third_party/base/ptr_util.h"
namespace {
struct CPDF_UniqueKeyGen {
void Generate(int count, ...);
int m_KeyLen;
char m_Key[128];
};
void CPDF_UniqueKeyGen::Generate(int count, ...) {
va_list argList;
va_start(argList, count);
for (int i = 0; i < count; i++) {
int p = va_arg(argList, int);
(reinterpret_cast<uint32_t*>(m_Key))[i] = p;
}
va_end(argList);
m_KeyLen = count * sizeof(uint32_t);
}
bool IsScanLine1bpp(uint8_t* pBuf, int width) {
int size = width / 8;
for (int i = 0; i < size; i++) {
if (pBuf[i])
return true;
}
return (width % 8) && (pBuf[width / 8] & (0xff << (8 - width % 8)));
}
bool IsScanLine8bpp(uint8_t* pBuf, int width) {
for (int i = 0; i < width; i++) {
if (pBuf[i] > 0x40)
return true;
}
return false;
}
int DetectFirstLastScan(const RetainPtr<CFX_DIBitmap>& pBitmap, bool bFirst) {
int height = pBitmap->GetHeight();
int pitch = pBitmap->GetPitch();
int width = pBitmap->GetWidth();
int bpp = pBitmap->GetBPP();
if (bpp > 8)
width *= bpp / 8;
uint8_t* pBuf = pBitmap->GetBuffer();
int line = bFirst ? 0 : height - 1;
int line_step = bFirst ? 1 : -1;
int line_end = bFirst ? height : -1;
while (line != line_end) {
if (bpp == 1) {
if (IsScanLine1bpp(pBuf + line * pitch, width))
return line;
} else {
if (IsScanLine8bpp(pBuf + line * pitch, width))
return line;
}
line += line_step;
}
return -1;
}
} // namespace
CPDF_Type3Cache::CPDF_Type3Cache(CPDF_Type3Font* pFont) : m_pFont(pFont) {}
CPDF_Type3Cache::~CPDF_Type3Cache() {}
CFX_GlyphBitmap* CPDF_Type3Cache::LoadGlyph(uint32_t charcode,
const CFX_Matrix* pMatrix) {
CPDF_UniqueKeyGen keygen;
keygen.Generate(
4, FXSYS_round(pMatrix->a * 10000), FXSYS_round(pMatrix->b * 10000),
FXSYS_round(pMatrix->c * 10000), FXSYS_round(pMatrix->d * 10000));
ByteString FaceGlyphsKey(keygen.m_Key, keygen.m_KeyLen);
CPDF_Type3Glyphs* pSizeCache;
auto it = m_SizeMap.find(FaceGlyphsKey);
if (it == m_SizeMap.end()) {
auto pNew = pdfium::MakeUnique<CPDF_Type3Glyphs>();
pSizeCache = pNew.get();
m_SizeMap[FaceGlyphsKey] = std::move(pNew);
} else {
pSizeCache = it->second.get();
}
auto it2 = pSizeCache->m_GlyphMap.find(charcode);
if (it2 != pSizeCache->m_GlyphMap.end())
return it2->second.get();
std::unique_ptr<CFX_GlyphBitmap> pNewBitmap =
RenderGlyph(pSizeCache, charcode, pMatrix);
CFX_GlyphBitmap* pGlyphBitmap = pNewBitmap.get();
pSizeCache->m_GlyphMap[charcode] = std::move(pNewBitmap);
return pGlyphBitmap;
}
std::unique_ptr<CFX_GlyphBitmap> CPDF_Type3Cache::RenderGlyph(
CPDF_Type3Glyphs* pSize,
uint32_t charcode,
const CFX_Matrix* pMatrix) {
const CPDF_Type3Char* pChar = m_pFont->LoadChar(charcode);
if (!pChar || !pChar->GetBitmap())
return nullptr;
CFX_Matrix text_matrix(pMatrix->a, pMatrix->b, pMatrix->c, pMatrix->d, 0, 0);
CFX_Matrix image_matrix = pChar->matrix();
image_matrix.Concat(text_matrix);
RetainPtr<CFX_DIBitmap> pBitmap = pChar->GetBitmap();
RetainPtr<CFX_DIBitmap> pResBitmap;
int left = 0;
int top = 0;
if (fabs(image_matrix.b) < fabs(image_matrix.a) / 100 &&
fabs(image_matrix.c) < fabs(image_matrix.d) / 100) {
int top_line = DetectFirstLastScan(pBitmap, true);
int bottom_line = DetectFirstLastScan(pBitmap, false);
if (top_line == 0 && bottom_line == pBitmap->GetHeight() - 1) {
float top_y = image_matrix.d + image_matrix.f;
float bottom_y = image_matrix.f;
bool bFlipped = top_y > bottom_y;
if (bFlipped)
std::swap(top_y, bottom_y);
std::tie(top_line, bottom_line) = pSize->AdjustBlue(top_y, bottom_y);
pResBitmap = pBitmap->StretchTo(
static_cast<int>(image_matrix.a),
static_cast<int>(bFlipped ? top_line - bottom_line
: bottom_line - top_line),
0, nullptr);
top = top_line;
if (image_matrix.a < 0)
left = FXSYS_round(image_matrix.e + image_matrix.a);
else
left = FXSYS_round(image_matrix.e);
}
}
if (!pResBitmap)
pResBitmap = pBitmap->TransformTo(&image_matrix, &left, &top);
if (!pResBitmap)
return nullptr;
auto pGlyph = pdfium::MakeUnique<CFX_GlyphBitmap>();
pGlyph->m_Left = left;
pGlyph->m_Top = -top;
pGlyph->m_pBitmap->TakeOver(std::move(pResBitmap));
return pGlyph;
}
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