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// Copyright 2016 The PDFium Authors
// 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_textrenderer.h"
#include <algorithm>
#include <vector>
#include "core/fpdfapi/font/cpdf_font.h"
#include "core/fpdfapi/render/charposlist.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fxge/cfx_graphstatedata.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/cfx_renderdevice.h"
#include "core/fxge/cfx_textrenderoptions.h"
#include "core/fxge/fx_font.h"
#include "core/fxge/text_char_pos.h"
namespace {
CFX_Font* GetFont(CPDF_Font* pFont, int32_t position) {
return position == -1 ? pFont->GetFont() : pFont->GetFontFallback(position);
}
CFX_TextRenderOptions GetTextRenderOptionsHelper(
const CPDF_Font* pFont,
const CPDF_RenderOptions& options) {
CFX_TextRenderOptions text_options;
if (pFont->IsCIDFont())
text_options.font_is_cid = true;
if (options.GetOptions().bNoTextSmooth)
text_options.aliasing_type = CFX_TextRenderOptions::kAliasing;
else if (options.GetOptions().bClearType)
text_options.aliasing_type = CFX_TextRenderOptions::kLcd;
if (options.GetOptions().bNoNativeText)
text_options.native_text = false;
return text_options;
}
} // namespace
// static
bool CPDF_TextRenderer::DrawTextPath(
CFX_RenderDevice* pDevice,
pdfium::span<const uint32_t> char_codes,
pdfium::span<const float> char_pos,
CPDF_Font* pFont,
float font_size,
const CFX_Matrix& mtText2User,
const CFX_Matrix* pUser2Device,
const CFX_GraphStateData* pGraphState,
FX_ARGB fill_argb,
FX_ARGB stroke_argb,
CFX_Path* pClippingPath,
const CFX_FillRenderOptions& fill_options) {
std::vector<TextCharPos> pos =
GetCharPosList(char_codes, char_pos, pFont, font_size);
if (pos.empty())
return true;
bool bDraw = true;
int32_t fontPosition = pos[0].m_FallbackFontPosition;
size_t startIndex = 0;
for (size_t i = 0; i < pos.size(); ++i) {
int32_t curFontPosition = pos[i].m_FallbackFontPosition;
if (fontPosition == curFontPosition)
continue;
CFX_Font* font = GetFont(pFont, fontPosition);
if (!pDevice->DrawTextPath(
pdfium::make_span(pos).subspan(startIndex, i - startIndex), font,
font_size, mtText2User, pUser2Device, pGraphState, fill_argb,
stroke_argb, pClippingPath, fill_options)) {
bDraw = false;
}
fontPosition = curFontPosition;
startIndex = i;
}
CFX_Font* font = GetFont(pFont, fontPosition);
if (!pDevice->DrawTextPath(pdfium::make_span(pos).subspan(startIndex), font,
font_size, mtText2User, pUser2Device, pGraphState,
fill_argb, stroke_argb, pClippingPath,
fill_options)) {
bDraw = false;
}
return bDraw;
}
// static
void CPDF_TextRenderer::DrawTextString(CFX_RenderDevice* pDevice,
float origin_x,
float origin_y,
CPDF_Font* pFont,
float font_size,
const CFX_Matrix& matrix,
const ByteString& str,
FX_ARGB fill_argb,
const CPDF_RenderOptions& options) {
if (pFont->IsType3Font())
return;
size_t nChars = pFont->CountChar(str.AsStringView());
if (nChars == 0)
return;
size_t offset = 0;
std::vector<uint32_t> codes;
std::vector<float> positions;
codes.resize(nChars);
positions.resize(nChars - 1);
float cur_pos = 0;
for (size_t i = 0; i < nChars; i++) {
codes[i] = pFont->GetNextChar(str.AsStringView(), &offset);
if (i)
positions[i - 1] = cur_pos;
cur_pos += pFont->GetCharWidthF(codes[i]) * font_size / 1000;
}
CFX_Matrix new_matrix = matrix;
new_matrix.e = origin_x;
new_matrix.f = origin_y;
DrawNormalText(pDevice, codes, positions, pFont, font_size, new_matrix,
fill_argb, options);
}
// static
bool CPDF_TextRenderer::DrawNormalText(CFX_RenderDevice* pDevice,
pdfium::span<const uint32_t> char_codes,
pdfium::span<const float> char_pos,
CPDF_Font* pFont,
float font_size,
const CFX_Matrix& mtText2Device,
FX_ARGB fill_argb,
const CPDF_RenderOptions& options) {
std::vector<TextCharPos> pos =
GetCharPosList(char_codes, char_pos, pFont, font_size);
if (pos.empty())
return true;
CFX_TextRenderOptions text_options =
GetTextRenderOptionsHelper(pFont, options);
bool bDraw = true;
int32_t fontPosition = pos[0].m_FallbackFontPosition;
size_t startIndex = 0;
for (size_t i = 0; i < pos.size(); ++i) {
int32_t curFontPosition = pos[i].m_FallbackFontPosition;
if (fontPosition == curFontPosition)
continue;
CFX_Font* font = GetFont(pFont, fontPosition);
if (!pDevice->DrawNormalText(
pdfium::make_span(pos).subspan(startIndex, i - startIndex), font,
font_size, mtText2Device, fill_argb, text_options)) {
bDraw = false;
}
fontPosition = curFontPosition;
startIndex = i;
}
CFX_Font* font = GetFont(pFont, fontPosition);
if (!pDevice->DrawNormalText(pdfium::make_span(pos).subspan(startIndex), font,
font_size, mtText2Device, fill_argb,
text_options)) {
bDraw = false;
}
return bDraw;
}