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print_settings_initializer_win.cc
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print_settings_initializer_win.cc
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// Copyright (c) 2011 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 "printing/print_settings_initializer_win.h"
#include <windows.h>
#include "printing/print_settings.h"
namespace printing {
namespace {
bool HasEscapeSupprt(HDC hdc, DWORD escape) {
const char* ptr = reinterpret_cast<const char*>(&escape);
return ExtEscape(hdc, QUERYESCSUPPORT, sizeof(escape), ptr, 0, nullptr) > 0;
}
bool IsTechnology(HDC hdc, const char* technology) {
if (::GetDeviceCaps(hdc, TECHNOLOGY) != DT_RASPRINTER)
return false;
// If postscript, try to query Postscript Identify and then set to
// postscript mode before calling any more ExtEscape functions. Otherwise,
// PSLEVEL query will not work.
if (strcmp(technology, "PostScript") == 0 &&
HasEscapeSupprt(hdc, POSTSCRIPT_IDENTIFY)) {
DWORD mode = PSIDENT_PSCENTRIC;
const char* ptr = reinterpret_cast<const char*>(&mode);
ExtEscape(hdc, POSTSCRIPT_IDENTIFY, sizeof(DWORD), ptr, 0, nullptr);
return true;
}
if (!HasEscapeSupprt(hdc, GETTECHNOLOGY))
return false;
char buf[256];
memset(buf, 0, sizeof(buf));
if (ExtEscape(hdc, GETTECHNOLOGY, 0, nullptr, sizeof(buf) - 1, buf) <= 0)
return false;
return strcmp(buf, technology) == 0;
}
bool IsPrinterPostScript(HDC hdc, int* level) {
static constexpr char kPostScriptDriver[] = "PostScript";
if (!IsTechnology(hdc, kPostScriptDriver)) {
return false;
}
// Query the PS Level if possible.
if (HasEscapeSupprt(hdc, GET_PS_FEATURESETTING)) {
constexpr int param = FEATURESETTING_PSLEVEL;
const char* param_char_ptr = reinterpret_cast<const char*>(¶m);
int param_out = -1;
char* param_out_char_ptr = reinterpret_cast<char*>(¶m_out);
if (ExtEscape(hdc, GET_PS_FEATURESETTING, sizeof(param), param_char_ptr,
sizeof(param_out), param_out_char_ptr) > 0) {
if (param_out < 2 || param_out > 3)
return false;
*level = param_out;
return true;
}
}
// If it looks like a PS printer.
if (HasEscapeSupprt(hdc, POSTSCRIPT_PASSTHROUGH) &&
HasEscapeSupprt(hdc, POSTSCRIPT_DATA)) {
*level = 2;
return true;
}
return false;
}
bool IsPrinterXPS(HDC hdc) {
static constexpr char kXPSDriver[] =
"http://schemas.microsoft.com/xps/2005/06";
return IsTechnology(hdc, kXPSDriver);
}
} // namespace
// static
void PrintSettingsInitializerWin::InitPrintSettings(
HDC hdc,
const DEVMODE& dev_mode,
PrintSettings* print_settings) {
DCHECK(hdc);
DCHECK(print_settings);
print_settings->SetOrientation(dev_mode.dmOrientation == DMORIENT_LANDSCAPE);
int dpi = GetDeviceCaps(hdc, LOGPIXELSX);
print_settings->set_dpi(dpi);
const int kAlphaCaps = SB_CONST_ALPHA | SB_PIXEL_ALPHA;
print_settings->set_supports_alpha_blend(
(GetDeviceCaps(hdc, SHADEBLENDCAPS) & kAlphaCaps) == kAlphaCaps);
// No printer device is known to advertise different dpi in X and Y axis; even
// the fax device using the 200x100 dpi setting. It's ought to break so many
// applications that it's not even needed to care about. Blink doesn't support
// different dpi settings in X and Y axis.
DCHECK_EQ(dpi, GetDeviceCaps(hdc, LOGPIXELSY));
DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORX), 0);
DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORY), 0);
// Initialize |page_setup_device_units_|.
gfx::Size physical_size_device_units(GetDeviceCaps(hdc, PHYSICALWIDTH),
GetDeviceCaps(hdc, PHYSICALHEIGHT));
gfx::Rect printable_area_device_units(GetDeviceCaps(hdc, PHYSICALOFFSETX),
GetDeviceCaps(hdc, PHYSICALOFFSETY),
GetDeviceCaps(hdc, HORZRES),
GetDeviceCaps(hdc, VERTRES));
// Sanity check the printable_area: we've seen crashes caused by a printable
// area rect of 0, 0, 0, 0, so it seems some drivers don't set it.
if (printable_area_device_units.IsEmpty() ||
!gfx::Rect(physical_size_device_units).Contains(
printable_area_device_units)) {
printable_area_device_units = gfx::Rect(physical_size_device_units);
}
DCHECK_EQ(print_settings->device_units_per_inch(), dpi);
print_settings->SetPrinterPrintableArea(physical_size_device_units,
printable_area_device_units,
false);
// Check for postscript first so that we can change the mode with the
// first command.
int level;
if (IsPrinterPostScript(hdc, &level)) {
if (level == 2) {
print_settings->set_printer_type(
PrintSettings::PrinterType::TYPE_POSTSCRIPT_LEVEL2);
return;
}
DCHECK_EQ(3, level);
print_settings->set_printer_type(
PrintSettings::PrinterType::TYPE_POSTSCRIPT_LEVEL3);
return;
}
if (IsPrinterXPS(hdc)) {
print_settings->set_printer_type(PrintSettings::PrinterType::TYPE_XPS);
return;
}
print_settings->set_printer_type(PrintSettings::PrinterType::TYPE_NONE);
}
} // namespace printing