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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/pdfium/pdfium_engine_exports.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/no_destructor.h"
#include "base/numerics/safe_conversions.h"
#include "base/optional.h"
#include "build/chromeos_buildflags.h"
#include "pdf/pdfium/pdfium_api_string_buffer_adapter.h"
#include "pdf/pdfium/pdfium_mem_buffer_file_write.h"
#include "pdf/pdfium/pdfium_print.h"
#include "printing/nup_parameters.h"
#include "printing/units.h"
#include "third_party/pdfium/public/cpp/fpdf_scopers.h"
#include "third_party/pdfium/public/fpdf_catalog.h"
#include "third_party/pdfium/public/fpdf_ppo.h"
#include "third_party/pdfium/public/fpdf_structtree.h"
#include "third_party/pdfium/public/fpdfview.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/geometry/vector2d.h"
using printing::ConvertUnitDouble;
using printing::kPointsPerInch;
namespace chrome_pdf {
namespace {
int CalculatePosition(FPDF_PAGE page,
const PDFiumEngineExports::RenderingSettings& settings,
gfx::Rect* dest) {
// settings.bounds is in terms of the max DPI. Convert page sizes to match.
const int dpi_x = settings.dpi.width();
const int dpi_y = settings.dpi.height();
const int dpi = std::max(dpi_x, dpi_y);
int page_width = static_cast<int>(
ConvertUnitDouble(FPDF_GetPageWidthF(page), kPointsPerInch, dpi));
int page_height = static_cast<int>(
ConvertUnitDouble(FPDF_GetPageHeightF(page), kPointsPerInch, dpi));
// Start by assuming that we will draw exactly to the bounds rect
// specified.
*dest = settings.bounds;
int rotate = 0; // normal orientation.
// Auto-rotate landscape pages to print correctly.
if (settings.autorotate &&
(dest->width() > dest->height()) != (page_width > page_height)) {
rotate = 3; // 90 degrees counter-clockwise.
std::swap(page_width, page_height);
}
// See if we need to scale the output
bool scale_to_bounds = false;
if (settings.fit_to_bounds &&
((page_width > dest->width()) || (page_height > dest->height()))) {
scale_to_bounds = true;
} else if (settings.stretch_to_bounds &&
((page_width < dest->width()) || (page_height < dest->height()))) {
scale_to_bounds = true;
}
if (scale_to_bounds) {
// If we need to maintain aspect ratio, calculate the actual width and
// height.
if (settings.keep_aspect_ratio) {
double scale_factor_x = page_width;
scale_factor_x /= dest->width();
double scale_factor_y = page_height;
scale_factor_y /= dest->height();
if (scale_factor_x > scale_factor_y) {
dest->set_height(page_height / scale_factor_x);
} else {
dest->set_width(page_width / scale_factor_y);
}
}
} else {
// We are not scaling to bounds. Draw in the actual page size. If the
// actual page size is larger than the bounds, the output will be
// clipped.
dest->set_width(page_width);
dest->set_height(page_height);
}
// Scale the bounds to device units if DPI is rectangular.
if (dpi_x != dpi_y) {
dest->set_width(dest->width() * dpi_x / dpi);
dest->set_height(dest->height() * dpi_y / dpi);
}
if (settings.center_in_bounds) {
gfx::Vector2d offset(
(settings.bounds.width() * dpi_x / dpi - dest->width()) / 2,
(settings.bounds.height() * dpi_y / dpi - dest->height()) / 2);
dest->Offset(offset);
}
return rotate;
}
ScopedFPDFDocument LoadPdfData(base::span<const uint8_t> pdf_buffer) {
if (!base::IsValueInRangeForNumericType<int>(pdf_buffer.size()))
return nullptr;
return ScopedFPDFDocument(
FPDF_LoadMemDocument(pdf_buffer.data(), pdf_buffer.size(), nullptr));
}
ScopedFPDFDocument CreatePdfDoc(
std::vector<base::span<const uint8_t>> input_buffers) {
if (input_buffers.empty())
return nullptr;
ScopedFPDFDocument doc(FPDF_CreateNewDocument());
size_t index = 0;
for (auto input_buffer : input_buffers) {
ScopedFPDFDocument single_page_doc = LoadPdfData(input_buffer);
if (!FPDF_ImportPages(doc.get(), single_page_doc.get(), "1", index++)) {
return nullptr;
}
}
return doc;
}
bool IsValidPrintableArea(const gfx::Size& page_size,
const gfx::Rect& printable_area) {
return !printable_area.IsEmpty() && printable_area.x() >= 0 &&
printable_area.y() >= 0 &&
printable_area.right() <= page_size.width() &&
printable_area.bottom() <= page_size.height();
}
int GetRenderFlagsFromSettings(
const PDFiumEngineExports::RenderingSettings& settings) {
int flags = FPDF_ANNOT;
if (!settings.use_color)
flags |= FPDF_GRAYSCALE;
if (settings.render_for_printing)
flags |= FPDF_PRINTING;
return flags;
}
base::Value RecursiveGetStructTree(FPDF_STRUCTELEMENT struct_elem) {
int children_count = FPDF_StructElement_CountChildren(struct_elem);
if (children_count <= 0)
return base::Value(base::Value::Type::NONE);
base::Optional<base::string16> opt_type =
CallPDFiumWideStringBufferApiAndReturnOptional(
base::BindRepeating(FPDF_StructElement_GetType, struct_elem), true);
if (!opt_type)
return base::Value(base::Value::Type::NONE);
base::Value result(base::Value::Type::DICTIONARY);
result.SetStringKey("type", *opt_type);
base::Optional<base::string16> opt_alt =
CallPDFiumWideStringBufferApiAndReturnOptional(
base::BindRepeating(FPDF_StructElement_GetAltText, struct_elem),
true);
if (opt_alt)
result.SetStringKey("alt", *opt_alt);
base::Optional<base::string16> opt_lang =
CallPDFiumWideStringBufferApiAndReturnOptional(
base::BindRepeating(FPDF_StructElement_GetLang, struct_elem), true);
if (opt_lang)
result.SetStringKey("lang", *opt_lang);
base::Value children(base::Value::Type::LIST);
for (int i = 0; i < children_count; i++) {
FPDF_STRUCTELEMENT child_elem =
FPDF_StructElement_GetChildAtIndex(struct_elem, i);
base::Value child = RecursiveGetStructTree(child_elem);
if (child.is_dict())
children.Append(std::move(child));
}
// use "~children" instead of "children" because we pretty-print the
// result of this as JSON and the keys are sorted; it's much easier to
// understand when the children are the last key.
if (!children.GetList().empty())
result.SetKey("~children", std::move(children));
return result;
}
} // namespace
PDFEngineExports::RenderingSettings::RenderingSettings(const gfx::Size& dpi,
const gfx::Rect& bounds,
bool fit_to_bounds,
bool stretch_to_bounds,
bool keep_aspect_ratio,
bool center_in_bounds,
bool autorotate,
bool use_color,
bool render_for_printing)
: dpi(dpi),
bounds(bounds),
fit_to_bounds(fit_to_bounds),
stretch_to_bounds(stretch_to_bounds),
keep_aspect_ratio(keep_aspect_ratio),
center_in_bounds(center_in_bounds),
autorotate(autorotate),
use_color(use_color),
render_for_printing(render_for_printing) {}
PDFEngineExports::RenderingSettings::RenderingSettings(
const RenderingSettings& that) = default;
PDFEngineExports* PDFEngineExports::Get() {
static base::NoDestructor<PDFiumEngineExports> exports;
return exports.get();
}
PDFiumEngineExports::PDFiumEngineExports() {}
PDFiumEngineExports::~PDFiumEngineExports() {}
#if BUILDFLAG(IS_CHROMEOS_ASH)
std::vector<uint8_t> PDFiumEngineExports::CreateFlattenedPdf(
base::span<const uint8_t> input_buffer) {
ScopedFPDFDocument doc = LoadPdfData(input_buffer);
if (!doc)
return std::vector<uint8_t>();
return PDFiumPrint::CreateFlattenedPdf(std::move(doc));
}
#endif // BUILDFLAG(IS_CHROMEOS_ASH)
#if defined(OS_WIN)
bool PDFiumEngineExports::RenderPDFPageToDC(
base::span<const uint8_t> pdf_buffer,
int page_number,
const RenderingSettings& settings,
HDC dc) {
ScopedFPDFDocument doc = LoadPdfData(pdf_buffer);
if (!doc)
return false;
ScopedFPDFPage page(FPDF_LoadPage(doc.get(), page_number));
if (!page)
return false;
RenderingSettings new_settings = settings;
// calculate the page size
if (new_settings.dpi.width() == -1)
new_settings.dpi.set_width(GetDeviceCaps(dc, LOGPIXELSX));
if (new_settings.dpi.height() == -1)
new_settings.dpi.set_height(GetDeviceCaps(dc, LOGPIXELSY));
gfx::Rect dest;
int rotate = CalculatePosition(page.get(), new_settings, &dest);
int save_state = SaveDC(dc);
// The caller wanted all drawing to happen within the bounds specified.
// Based on scale calculations, our destination rect might be larger
// than the bounds. Set the clip rect to the bounds.
IntersectClipRect(dc, settings.bounds.x(), settings.bounds.y(),
settings.bounds.x() + settings.bounds.width(),
settings.bounds.y() + settings.bounds.height());
int flags = GetRenderFlagsFromSettings(settings);
// A "temporary" hack. Some PDFs seems to render very slowly if
// FPDF_RenderPage() is directly used on a printer DC. I suspect it is
// because of the code to talk Postscript directly to the printer if
// the printer supports this. Need to discuss this with PDFium. For now,
// render to a bitmap and then blit the bitmap to the DC if we have been
// supplied a printer DC.
int device_type = GetDeviceCaps(dc, TECHNOLOGY);
if (device_type == DT_RASPRINTER || device_type == DT_PLOTTER) {
ScopedFPDFBitmap bitmap(
FPDFBitmap_Create(dest.width(), dest.height(), FPDFBitmap_BGRx));
// Clear the bitmap
FPDFBitmap_FillRect(bitmap.get(), 0, 0, dest.width(), dest.height(),
0xFFFFFFFF);
FPDF_RenderPageBitmap(bitmap.get(), page.get(), 0, 0, dest.width(),
dest.height(), rotate, flags);
int stride = FPDFBitmap_GetStride(bitmap.get());
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(bmi));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = dest.width();
bmi.bmiHeader.biHeight = -dest.height(); // top-down image
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = stride * dest.height();
StretchDIBits(dc, dest.x(), dest.y(), dest.width(), dest.height(), 0, 0,
dest.width(), dest.height(),
FPDFBitmap_GetBuffer(bitmap.get()), &bmi, DIB_RGB_COLORS,
SRCCOPY);
} else {
FPDF_RenderPage(dc, page.get(), dest.x(), dest.y(), dest.width(),
dest.height(), rotate, flags);
}
RestoreDC(dc, save_state);
return true;
}
void PDFiumEngineExports::SetPDFEnsureTypefaceCharactersAccessible(
PDFEnsureTypefaceCharactersAccessible func) {
FPDF_SetTypefaceAccessibleFunc(
reinterpret_cast<PDFiumEnsureTypefaceCharactersAccessible>(func));
}
void PDFiumEngineExports::SetPDFUseGDIPrinting(bool enable) {
FPDF_SetPrintTextWithGDI(enable);
}
void PDFiumEngineExports::SetPDFUsePrintMode(int mode) {
FPDF_SetPrintMode(mode);
}
#endif // defined(OS_WIN)
bool PDFiumEngineExports::RenderPDFPageToBitmap(
base::span<const uint8_t> pdf_buffer,
int page_number,
const RenderingSettings& settings,
void* bitmap_buffer) {
ScopedFPDFDocument doc = LoadPdfData(pdf_buffer);
if (!doc)
return false;
ScopedFPDFPage page(FPDF_LoadPage(doc.get(), page_number));
if (!page)
return false;
gfx::Rect dest;
int rotate = CalculatePosition(page.get(), settings, &dest);
ScopedFPDFBitmap bitmap(FPDFBitmap_CreateEx(
settings.bounds.width(), settings.bounds.height(), FPDFBitmap_BGRA,
bitmap_buffer, settings.bounds.width() * 4));
// Clear the bitmap
FPDFBitmap_FillRect(bitmap.get(), 0, 0, settings.bounds.width(),
settings.bounds.height(), 0xFFFFFFFF);
// Shift top-left corner of bounds to (0, 0) if it's not there.
dest.set_origin(dest.origin() - settings.bounds.OffsetFromOrigin());
FPDF_RenderPageBitmap(bitmap.get(), page.get(), dest.x(), dest.y(),
dest.width(), dest.height(), rotate,
GetRenderFlagsFromSettings(settings));
return true;
}
std::vector<uint8_t> PDFiumEngineExports::ConvertPdfPagesToNupPdf(
std::vector<base::span<const uint8_t>> input_buffers,
size_t pages_per_sheet,
const gfx::Size& page_size,
const gfx::Rect& printable_area) {
if (!IsValidPrintableArea(page_size, printable_area))
return std::vector<uint8_t>();
ScopedFPDFDocument doc = CreatePdfDoc(std::move(input_buffers));
if (!doc)
return std::vector<uint8_t>();
return PDFiumPrint::CreateNupPdf(std::move(doc), pages_per_sheet, page_size,
printable_area);
}
std::vector<uint8_t> PDFiumEngineExports::ConvertPdfDocumentToNupPdf(
base::span<const uint8_t> input_buffer,
size_t pages_per_sheet,
const gfx::Size& page_size,
const gfx::Rect& printable_area) {
if (!IsValidPrintableArea(page_size, printable_area))
return std::vector<uint8_t>();
ScopedFPDFDocument doc = LoadPdfData(input_buffer);
if (!doc)
return std::vector<uint8_t>();
return PDFiumPrint::CreateNupPdf(std::move(doc), pages_per_sheet, page_size,
printable_area);
}
bool PDFiumEngineExports::GetPDFDocInfo(base::span<const uint8_t> pdf_buffer,
int* page_count,
float* max_page_width) {
ScopedFPDFDocument doc = LoadPdfData(pdf_buffer);
if (!doc)
return false;
if (!page_count && !max_page_width)
return true;
int page_count_local = FPDF_GetPageCount(doc.get());
if (page_count)
*page_count = page_count_local;
if (max_page_width) {
*max_page_width = 0;
for (int page_number = 0; page_number < page_count_local; page_number++) {
FS_SIZEF page_size;
if (FPDF_GetPageSizeByIndexF(doc.get(), page_number, &page_size) &&
page_size.width > *max_page_width) {
*max_page_width = page_size.width;
}
}
}
return true;
}
base::Optional<bool> PDFiumEngineExports::IsPDFDocTagged(
base::span<const uint8_t> pdf_buffer) {
ScopedFPDFDocument doc = LoadPdfData(pdf_buffer);
if (!doc)
return base::nullopt;
return FPDFCatalog_IsTagged(doc.get());
}
base::Value PDFiumEngineExports::GetPDFStructTreeForPage(
base::span<const uint8_t> pdf_buffer,
int page_index) {
ScopedFPDFDocument doc = LoadPdfData(pdf_buffer);
if (!doc)
return base::Value(base::Value::Type::NONE);
ScopedFPDFPage page(FPDF_LoadPage(doc.get(), page_index));
if (!page)
return base::Value(base::Value::Type::NONE);
ScopedFPDFStructTree struct_tree(FPDF_StructTree_GetForPage(page.get()));
if (!struct_tree)
return base::Value(base::Value::Type::NONE);
// We only expect one child of the struct tree - i.e. a single root node.
int children = FPDF_StructTree_CountChildren(struct_tree.get());
if (children != 1)
return base::Value(base::Value::Type::NONE);
FPDF_STRUCTELEMENT struct_root_elem =
FPDF_StructTree_GetChildAtIndex(struct_tree.get(), 0);
if (!struct_root_elem)
return base::Value(base::Value::Type::NONE);
return RecursiveGetStructTree(struct_root_elem);
}
base::Optional<gfx::SizeF> PDFiumEngineExports::GetPDFPageSizeByIndex(
base::span<const uint8_t> pdf_buffer,
int page_number) {
ScopedFPDFDocument doc = LoadPdfData(pdf_buffer);
if (!doc)
return base::nullopt;
FS_SIZEF size;
if (!FPDF_GetPageSizeByIndexF(doc.get(), page_number, &size))
return base::nullopt;
return gfx::SizeF(size.width, size.height);
}
} // namespace chrome_pdf