Connect the right metafiles for print preview on Linux and Windows.

+ Remove the NativeMetafileFactory since we can't just use preview flag.
+ Update each Metafile constructor site to use PreviewMetafile or NativeMetafileImpl.
+ Fix misc. problems blocking pdf generation on Windows.
+ Rename the metafile interface.

BUG=NONE
TEST=NONE

Review URL: http://codereview.chromium.org/6826027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81161 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 151 insertions, 0 deletions

diff --git a/printing/metafile.h b/printing/metafile.h
new file mode 100644
index 0000000..264c8fe
--- /dev/null
+++ b/printing/metafile.h
@@ -0,0 +1,151 @@
+// 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.
+
+#ifndef PRINTING_METAFILE_H_
+#define PRINTING_METAFILE_H_
+
+#include "base/basictypes.h"
+#include "build/build_config.h"
+#include "ui/gfx/native_widget_types.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_MACOSX)
+#include <ApplicationServices/ApplicationServices.h>
+#include <CoreFoundation/CoreFoundation.h>
+#include "base/mac/scoped_cftyperef.h"
+#endif
+
+class FilePath;
+
+namespace gfx {
+class Point;
+class Rect;
+class Size;
+}
+
+namespace skia {
+class PlatformDevice;
+}
+
+#if defined(OS_CHROMEOS)
+namespace base {
+class  FileDescriptor;
+}
+#endif
+
+namespace printing {
+
+// This class creates a graphics context that renders into a data stream
+// (usually PDF or EMF).
+class Metafile {
+ public:
+  virtual ~Metafile() {}
+
+  // Initializes a fresh new metafile for rendering. Returns false on failure.
+  // Note: It should only be called from within the renderer process to allocate
+  // rendering resources.
+  virtual bool Init() = 0;
+
+  // Initializes the metafile with the data in |src_buffer|. Returns true
+  // on success.
+  // Note: It should only be called from within the browser process.
+  virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size) = 0;
+
+  // This method calls StartPage and then returns an appropriate
+  // VectorPlatformDevice implementation bound to the context created by
+  // StartPage or NULL on error.
+  virtual skia::PlatformDevice* StartPageForVectorCanvas(
+      const gfx::Size& page_size, const gfx::Point& content_origin,
+      const float& scale_factor) = 0;
+
+  // Prepares a context for rendering a new page at the specified
+  // |content_origin| with the given |page_size| and a |scale_factor| to use for
+  // the drawing. The units are in points (=1/72 in). Returns true on success.
+  virtual bool StartPage(const gfx::Size& page_size,
+                         const gfx::Point& content_origin,
+                         const float& scale_factor) = 0;
+
+  // Closes the current page and destroys the context used in rendering that
+  // page. The results of current page will be appended into the underlying
+  // data stream. Returns true on success.
+  virtual bool FinishPage() = 0;
+
+  // Closes the metafile. No further rendering is allowed (the current page
+  // is implicitly closed).
+  virtual bool FinishDocument() = 0;
+
+  // Returns the size of the underlying data stream. Only valid after Close()
+  // has been called.
+  virtual uint32 GetDataSize() const = 0;
+
+  // Copies the first |dst_buffer_size| bytes of the underlying data stream into
+  // |dst_buffer|. This function should ONLY be called after Close() is invoked.
+  // Returns true if the copy succeeds.
+  virtual bool GetData(void* dst_buffer, uint32 dst_buffer_size) const = 0;
+
+  // Saves the underlying data to the given file. This function should ONLY be
+  // called after the metafile is closed. Returns true if writing succeeded.
+  virtual bool SaveTo(const FilePath& file_path) const = 0;
+
+  // Returns the bounds of the given page. Pages use a 1-based index.
+  virtual gfx::Rect GetPageBounds(unsigned int page_number) const = 0;
+  virtual unsigned int GetPageCount() const = 0;
+
+  // Get the context for rendering to the PDF.
+  virtual gfx::NativeDrawingContext context() const = 0;
+
+#if defined(OS_WIN)
+  // "Plays" the EMF buffer in a HDC. It is the same effect as calling the
+  // original GDI function that were called when recording the EMF. |rect| is in
+  // "logical units" and is optional. If |rect| is NULL, the natural EMF bounds
+  // are used.
+  // Note: Windows has been known to have stack buffer overflow in its GDI
+  // functions, whether used directly or indirectly through precompiled EMF
+  // data. We have to accept the risk here. Since it is used only for printing,
+  // it requires user intervention.
+  virtual bool Playback(gfx::NativeDrawingContext hdc,
+                        const RECT* rect) const = 0;
+
+  // The slow version of Playback(). It enumerates all the records and play them
+  // back in the HDC. The trick is that it skip over the records known to have
+  // issue with some printers. See Emf::Record::SafePlayback implementation for
+  // details.
+  virtual bool SafePlayback(gfx::NativeDrawingContext hdc) const = 0;
+
+  virtual HENHMETAFILE emf() const = 0;
+#elif defined(OS_MACOSX)
+  // Renders the given page into |rect| in the given context.
+  // Pages use a 1-based index. The rendering uses the following arguments
+  // to determine scaling and translation factors.
+  // |shrink_to_fit| specifies whether the output should be shrunk to fit the
+  // supplied |rect| if the page size is larger than |rect| in any dimension.
+  // If this is false, parts of the PDF page that lie outside the bounds will be
+  // clipped.
+  // |stretch_to_fit| specifies whether the output should be stretched to fit
+  // the supplied bounds if the page size is smaller than |rect| in all
+  // dimensions.
+  // |center_horizontally| specifies whether the final image (after any scaling
+  // is done) should be centered horizontally within the given |rect|.
+  // |center_vertically| specifies whether the final image (after any scaling
+  // is done) should be centered vertically within the given |rect|.
+  // Note that all scaling preserves the original aspect ratio of the page.
+  virtual bool RenderPage(unsigned int page_number,
+                          gfx::NativeDrawingContext context,
+                          const CGRect rect,
+                          bool shrink_to_fit,
+                          bool stretch_to_fit,
+                          bool center_horizontally,
+                          bool center_vertically) const = 0;
+#elif defined(OS_CHROMEOS)
+  // Saves the underlying data to the file associated with fd. This function
+  // should ONLY be called after the metafile is closed.
+  // Returns true if writing succeeded.
+  virtual bool SaveToFD(const base::FileDescriptor& fd) const = 0;
+#endif  // if defined(OS_CHROMEOS)
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_METAFILE_H_