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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/backend/win_helper.h"
- #include "printing/mojom/print.mojom.h"
- #include "printing/print_settings.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];
- memset(buf, 0, sizeof(buf));
- if (ExtEscape(hdc, GETTECHNOLOGY, 0, nullptr, sizeof(buf) - 1, buf) <= 0)
- return false;
- return 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);
- const int kAlphaCaps = SB_CONST_ALPHA | SB_PIXEL_ALPHA;
- print_settings->set_supports_alpha_blend(
- (GetDeviceCaps(hdc, SHADEBLENDCAPS) & kAlphaCaps) == kAlphaCaps);
- DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORX), 0);
- DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORY), 0);
- // Initialize `page_setup_device_units_`.
- // 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.
- int dpi = print_settings->dpi();
- gfx::Size physical_size_device_units(
- GetDeviceCaps(hdc, PHYSICALWIDTH) * dpi / dpi_x,
- GetDeviceCaps(hdc, PHYSICALHEIGHT) * dpi / dpi_y);
- gfx::Rect printable_area_device_units(
- GetDeviceCaps(hdc, PHYSICALOFFSETX) * dpi / dpi_x,
- GetDeviceCaps(hdc, PHYSICALOFFSETY) * dpi / dpi_y,
- GetDeviceCaps(hdc, HORZRES) * dpi / dpi_x,
- GetDeviceCaps(hdc, VERTRES) * dpi / dpi_y);
- // 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);
- 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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