Add Postscript Printing

chrome/utility/printing_handler.cc

Index: chrome/utility/printing_handler.cc
diff --git a/chrome/utility/printing_handler.cc b/chrome/utility/printing_handler.cc
index 390cd39b2f6b26e023c3e1418966cfba17c690a7..35dc231ea1d7948d5a827f3a05ac9896e43a1fc4 100644
--- a/chrome/utility/printing_handler.cc
+++ b/chrome/utility/printing_handler.cc
@@ -89,8 +89,16 @@ void PrintingHandler::OnRenderPDFPagesToMetafile(
     IPC::PlatformFileForTransit pdf_transit,
     const PdfRenderSettings& settings) {
   pdf_rendering_settings_ = settings;
+  chrome_pdf::SetPDFPostscriptPrintingLevel(0);  // Not using postscript.
   chrome_pdf::SetPDFUseGDIPrinting(pdf_rendering_settings_.mode ==
                                    PdfRenderSettings::Mode::GDI_TEXT);
+  if (pdf_rendering_settings_.mode ==
+      PdfRenderSettings::Mode::POSTSCRIPT_LEVEL2) {
+    chrome_pdf::SetPDFPostscriptPrintingLevel(2);
+  } else if (pdf_rendering_settings_.mode ==
+             PdfRenderSettings::Mode::POSTSCRIPT_LEVEL3) {
+    chrome_pdf::SetPDFPostscriptPrintingLevel(3);
+  }
   base::File pdf_file = IPC::PlatformFileForTransitToFile(pdf_transit);
   int page_count = LoadPDF(std::move(pdf_file));
   Send(
@@ -102,8 +110,17 @@ void PrintingHandler::OnRenderPDFPagesToMetafileGetPage(
     IPC::PlatformFileForTransit output_file) {
   base::File emf_file = IPC::PlatformFileForTransitToFile(output_file);
   float scale_factor = 1.0f;
-  bool success =
-      RenderPdfPageToMetafile(page_number, std::move(emf_file), &scale_factor);
+  bool success = false;
+  if (pdf_rendering_settings_.mode ==
+          PdfRenderSettings::Mode::POSTSCRIPT_LEVEL2 ||
+      pdf_rendering_settings_.mode ==
+          PdfRenderSettings::Mode::POSTSCRIPT_LEVEL3) {
+    success = RenderPdfPageToPostScript(page_number, std::move(emf_file));

[Nico, 2017/01/31 20:17:42]

add comment why scale factor of 1 is always right in this case

[rbpotter, 2017/02/01 01:09:00]

Done.

+  } else {
+    success = RenderPdfPageToMetafile(page_number, std::move(emf_file),
+                                      &scale_factor);
+  }
+
   Send(new ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageDone(
       success, scale_factor));
 }
@@ -112,7 +129,7 @@ void PrintingHandler::OnRenderPDFPagesToMetafileStop() {
   ReleaseProcessIfNeeded();
 }
 
-#endif  // OS_WIN
+#endif  // defined(OS_WIN)
 
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 void PrintingHandler::OnRenderPDFPagesToPWGRaster(
@@ -130,7 +147,7 @@ void PrintingHandler::OnRenderPDFPagesToPWGRaster(
   }
   ReleaseProcessIfNeeded();
 }
-#endif  // ENABLE_PRINT_PREVIEW
+#endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
 
 #if defined(OS_WIN)
 int PrintingHandler::LoadPDF(base::File pdf_file) {
@@ -185,6 +202,30 @@ bool PrintingHandler::RenderPdfPageToMetafile(int page_number,
   metafile.FinishDocument();
   return metafile.SaveTo(&output_file);
 }
+
+bool PrintingHandler::RenderPdfPageToPostScript(int page_number,
+                                                base::File output_file) {
+  Emf metafile;
+  metafile.Init();

[Nico, 2017/01/31 20:17:41]

this function looks identical to RenderPdfPageToMetafile except that this
function here looks at pdf_rendering_settings_.offsets while the other one does
some scaling. why the difference? why the duplication?

[rbpotter, 2017/02/01 01:09:00]

I merged these two to eliminate the duplication.
The difference is because the postscript driver does not use the
metafile size since it outputs postscript rather than metafile.
Instead it uses the printable area directly. So we do not need to
scale the HDC to match the metafile, and we need to send the physical
offsets from the printer.

+
+  // The underlying metafile is of type Emf and ignores the arguments passed
+  // to StartPage.
+  metafile.StartPage(gfx::Size(), gfx::Rect(), 1);
+  if (!chrome_pdf::RenderPDFPageToDC(
+          &pdf_data_.front(), pdf_data_.size(), page_number, metafile.context(),
+          pdf_rendering_settings_.dpi, pdf_rendering_settings_.area.x() -
+                                           pdf_rendering_settings_.offsets.x(),
+          pdf_rendering_settings_.area.y() -
+              pdf_rendering_settings_.offsets.y(),
+          pdf_rendering_settings_.area.width(),
+          pdf_rendering_settings_.area.height(), true, false, true, true,
+          pdf_rendering_settings_.autorotate)) {
+    return false;
+  }
+  metafile.FinishPage();
+  metafile.FinishDocument();
+  return metafile.SaveTo(&output_file);
+}
 #endif  // defined(OS_WIN)
 
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
@@ -309,6 +350,6 @@ void PrintingHandler::OnGetPrinterSemanticCapsAndDefaults(
   }
   ReleaseProcessIfNeeded();
 }
-#endif  // ENABLE_PRINT_PREVIEW
+#endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
 
 }  // namespace printing