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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/fpdfdoc/cpdf_defaultappearance.h"
#include <algorithm>
#include <vector>
#include "core/fpdfapi/parser/cpdf_simple_parser.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fxge/cfx_color.h"
namespace {
// Find the token and its |nParams| parameters from the start of data,
// and move the current position to the start of those parameters.
bool FindTagParamFromStart(CPDF_SimpleParser* parser,
const ByteStringView& token,
int nParams) {
nParams++;
std::vector<uint32_t> pBuf(nParams);
int buf_index = 0;
int buf_count = 0;
parser->SetCurPos(0);
while (1) {
pBuf[buf_index++] = parser->GetCurPos();
if (buf_index == nParams)
buf_index = 0;
buf_count++;
if (buf_count > nParams)
buf_count = nParams;
ByteStringView word = parser->GetWord();
if (word.IsEmpty())
return false;
if (word == token) {
if (buf_count < nParams)
continue;
parser->SetCurPos(pBuf[buf_index]);
return true;
}
}
return false;
}
} // namespace
Optional<ByteString> CPDF_DefaultAppearance::GetFont(float* fFontSize) {
*fFontSize = 0.0f;
if (m_csDA.IsEmpty())
return {};
ByteString csFontNameTag;
CPDF_SimpleParser syntax(m_csDA.AsStringView().span());
if (FindTagParamFromStart(&syntax, "Tf", 2)) {
csFontNameTag = ByteString(syntax.GetWord());
csFontNameTag.Delete(0, 1);
*fFontSize = FX_atof(syntax.GetWord());
}
return {PDF_NameDecode(csFontNameTag.AsStringView())};
}
Optional<CFX_Color::Type> CPDF_DefaultAppearance::GetColor(float fc[4]) {
for (int c = 0; c < 4; c++)
fc[c] = 0;
if (m_csDA.IsEmpty())
return {};
CPDF_SimpleParser syntax(m_csDA.AsStringView().span());
if (FindTagParamFromStart(&syntax, "g", 1)) {
fc[0] = FX_atof(syntax.GetWord());
return {CFX_Color::kGray};
}
if (FindTagParamFromStart(&syntax, "rg", 3)) {
fc[0] = FX_atof(syntax.GetWord());
fc[1] = FX_atof(syntax.GetWord());
fc[2] = FX_atof(syntax.GetWord());
return {CFX_Color::kRGB};
}
if (FindTagParamFromStart(&syntax, "k", 4)) {
fc[0] = FX_atof(syntax.GetWord());
fc[1] = FX_atof(syntax.GetWord());
fc[2] = FX_atof(syntax.GetWord());
fc[3] = FX_atof(syntax.GetWord());
return {CFX_Color::kCMYK};
}
return {};
}
std::pair<Optional<CFX_Color::Type>, FX_ARGB>
CPDF_DefaultAppearance::GetColor() {
float values[4];
Optional<CFX_Color::Type> type = GetColor(values);
if (!type)
return {type, 0};
if (*type == CFX_Color::kGray) {
int g = static_cast<int>(values[0] * 255 + 0.5f);
return {type, ArgbEncode(255, g, g, g)};
}
if (*type == CFX_Color::kRGB) {
int r = static_cast<int>(values[0] * 255 + 0.5f);
int g = static_cast<int>(values[1] * 255 + 0.5f);
int b = static_cast<int>(values[2] * 255 + 0.5f);
return {type, ArgbEncode(255, r, g, b)};
}
if (*type == CFX_Color::kCMYK) {
float r = 1.0f - std::min(1.0f, values[0] + values[3]);
float g = 1.0f - std::min(1.0f, values[1] + values[3]);
float b = 1.0f - std::min(1.0f, values[2] + values[3]);
return {type, ArgbEncode(255, static_cast<int>(r * 255 + 0.5f),
static_cast<int>(g * 255 + 0.5f),
static_cast<int>(b * 255 + 0.5f))};
}
NOTREACHED();
return {{}, 0};
}
bool CPDF_DefaultAppearance::FindTagParamFromStartForTesting(
CPDF_SimpleParser* parser,
const ByteStringView& token,
int nParams) {
return FindTagParamFromStart(parser, token, nParams);
}
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