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// Copyright 2011 The Chromium Authors
// 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 "base/check_op.h"
#include "base/compiler_specific.h"
#include "printing/backend/win_helper.h"
#include "printing/mojom/print.mojom.h"
#include "printing/print_settings.h"
#include "printing/printing_utils.h"
namespace printing {
namespace {
bool HasEscapeSupport(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 (!HasEscapeSupport(hdc, GETTECHNOLOGY))
return false;
char buf[256];
UNSAFE_TODO(memset(buf, 0, sizeof(buf)));
if (ExtEscape(hdc, GETTECHNOLOGY, 0, nullptr, sizeof(buf) - 1, buf) <= 0)
return false;
return UNSAFE_TODO(strcmp(buf, technology)) == 0;
}
void SetPrinterToGdiMode(HDC hdc) {
// Try to set to GDI centric mode
DWORD mode = PSIDENT_GDICENTRIC;
const char* ptr = reinterpret_cast<const char*>(&mode);
ExtEscape(hdc, POSTSCRIPT_IDENTIFY, sizeof(DWORD), ptr, 0, nullptr);
}
int GetPrinterPostScriptLevel(HDC hdc) {
constexpr int param = FEATURESETTING_PSLEVEL;
const char* param_char_ptr = reinterpret_cast<const char*>(¶m);
int param_out = 0;
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) {
return param_out;
}
return 0;
}
bool IsPrinterPostScript(HDC hdc, int* level) {
static constexpr char kPostScriptDriver[] = "PostScript";
// If printer does not support POSTSCRIPT_IDENTIFY, it cannot be set to GDI
// mode to check the language level supported. See if it looks like a
// postscript printer and supports the postscript functions that are
// supported in compatability mode. If so set to level 2 postscript.
if (!HasEscapeSupport(hdc, POSTSCRIPT_IDENTIFY)) {
if (!IsTechnology(hdc, kPostScriptDriver))
return false;
if (!HasEscapeSupport(hdc, POSTSCRIPT_PASSTHROUGH) ||
!HasEscapeSupport(hdc, POSTSCRIPT_DATA)) {
return false;
}
*level = 2;
return true;
}
// Printer supports POSTSCRIPT_IDENTIFY so we can assume it has a postscript
// driver. Set the printer to GDI mode in order to query the postscript
// level. Use GDI mode instead of PostScript mode so that if level detection
// fails or returns language level < 2 we can fall back to normal printing.
// Note: This escape must be called before other escapes.
SetPrinterToGdiMode(hdc);
if (!HasEscapeSupport(hdc, GET_PS_FEATURESETTING)) {
// Can't query the level, use level 2 to be safe
*level = 2;
return true;
}
// Get the language level. If invalid or < 2, return false to set printer to
// normal printing mode.
*level = GetPrinterPostScriptLevel(hdc);
return *level == 2 || *level == 3;
}
bool IsPrinterXPS(HDC hdc) {
static constexpr char kXPSDriver[] =
"http://schemas.microsoft.com/xps/2005/06";
return IsTechnology(hdc, kXPSDriver);
}
bool IsPrinterTextOnly(HDC hdc) {
return ::GetDeviceCaps(hdc, TECHNOLOGY) == DT_CHARSTREAM;
}
} // 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_x = GetDeviceCaps(hdc, LOGPIXELSX);
int dpi_y = GetDeviceCaps(hdc, LOGPIXELSY);
print_settings->set_dpi_xy(dpi_x, dpi_y);
int dpi = print_settings->dpi();
DCHECK_EQ(print_settings->device_units_per_inch(), dpi);
DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORX), 0);
DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORY), 0);
// Blink doesn't support different dpi settings in X and Y axis. However,
// some printers use them. So, to avoid a bad page calculation, scale page
// size components based on the dpi in the appropriate dimension.
gfx::Size physical_size_scaled(
GetDeviceCaps(hdc, PHYSICALWIDTH) * dpi / dpi_x,
GetDeviceCaps(hdc, PHYSICALHEIGHT) * dpi / dpi_y);
gfx::Rect printable_area_device_units = GetPrintableAreaDeviceUnits(hdc);
gfx::Rect printable_area_scaled =
gfx::Rect(printable_area_device_units.x() * dpi / dpi_x,
printable_area_device_units.y() * dpi / dpi_y,
printable_area_device_units.width() * dpi / dpi_x,
printable_area_device_units.height() * dpi / dpi_y);
print_settings->SetPrinterPrintableArea(physical_size_scaled,
printable_area_scaled, false);
print_settings->set_color(IsDevModeWithColor(&dev_mode)
? mojom::ColorModel::kColor
: mojom::ColorModel::kGray);
// 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_language_type(
mojom::PrinterLanguageType::kPostscriptLevel2);
return;
}
DCHECK_EQ(3, level);
print_settings->set_printer_language_type(
mojom::PrinterLanguageType::kPostscriptLevel3);
return;
}
// Detects the generic / text only driver.
if (IsPrinterTextOnly(hdc)) {
print_settings->set_printer_language_type(
mojom::PrinterLanguageType::kTextOnly);
return;
}
if (IsPrinterXPS(hdc)) {
print_settings->set_printer_language_type(mojom::PrinterLanguageType::kXps);
return;
}
print_settings->set_printer_language_type(mojom::PrinterLanguageType::kNone);
}
} // namespace printing
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