Bug 1665618. Fallback to allowing printing in color on failure to get printer capabilities. r=bobowen

Differential Revision: https://phabricator.services.mozilla.com/D90546

widget/nsPrintSettingsImpl.h

@@ -28,7 +28,10 @@ namespace mozilla {
 struct PrintSettingsInitializer {
   nsString mPrinter;
   PaperInfo mPaperInfo;
-  bool mPrintInColor = false;
+  // If we fail to obtain printer capabilities, being given the option to print
+  // in color to your monochrome printer is a lot less annoying than not being
+  // given the option to print in color to your color printer.
+  bool mPrintInColor = true;
   int mResolution = 0;
 #ifdef XP_WIN
   CopyableTArray<uint8_t> mDevmodeWStorage;

widget/nsPrinterCUPS.cpp

@@ -101,7 +101,6 @@ PrintSettingsInitializer nsPrinterCUPS::DefaultSettings() const {
                                     CUPS_MEDIA_FLAGS_DEFAULT, &media);
 
   if (!hasDefaultMedia) {
-    Nothing();
     return PrintSettingsInitializer{
         std::move(printerName),
         PaperInfo(),
@@ -184,10 +183,11 @@ bool nsPrinterCUPS::SupportsColor() const {
   // results for CUPS_PRINT_COLOR_MODE.
   // See https://bugzilla.mozilla.org/show_bug.cgi?id=1660658#c15
   if (!IsCUPSVersionAtLeast(2, 2, 0)) {
-    return true;
+    return true;  // See comment for PrintSettingsInitializer.mPrintInColor
   }
-  return Supports(CUPS_PRINT_COLOR_MODE, CUPS_PRINT_COLOR_MODE_COLOR) ||
-         Supports(CUPS_PRINT_COLOR_MODE, CUPS_PRINT_COLOR_MODE_AUTO);
+  return Supports(CUPS_PRINT_COLOR_MODE, CUPS_PRINT_COLOR_MODE_AUTO) ||
+         Supports(CUPS_PRINT_COLOR_MODE, CUPS_PRINT_COLOR_MODE_COLOR) ||
+         !Supports(CUPS_PRINT_COLOR_MODE, CUPS_PRINT_COLOR_MODE_MONOCHROME);
 }
 
 bool nsPrinterCUPS::SupportsCollation() const {

widget/windows/nsPrinterWin.cpp

@@ -71,7 +71,7 @@ PrintSettingsInitializer nsPrinterWin::DefaultSettings() const {
   SizeDouble paperSize{8.5 * 72.0, 11.0 * 72.0};
   gfx::MarginDouble margin;
   int resolution = 0;
-  bool color = false;
+  bool color = true;
 
   nsTArray<uint8_t> devmodeWStorage;
   bool success = WithDefaultDevMode(
@@ -105,8 +105,10 @@ PrintSettingsInitializer nsPrinterWin::DefaultSettings() const {
 
         // Using Y to match existing code for print scaling calculations.
         resolution = GetDeviceCaps(printerDc, LOGPIXELSY);
-        color =
-            (devmode->dmFields & DM_COLOR) && devmode->dmColor == DMCOLOR_COLOR;
+        if (devmode->dmFields & DM_COLOR) {
+          // See comment for PrintSettingsInitializer.mPrintInColor
+          color = devmode->dmColor != DMCOLOR_MONOCHROME;
+        }
         return true;
       });