Printing: Move some printing code out of pdf/ and into printing/.

printing/pdf_transform.h

Index: printing/pdf_transform.h
diff --git a/printing/pdf_transform.h b/printing/pdf_transform.h
new file mode 100644
index 0000000000000000000000000000000000000000..2cc244b17406fc7b9607adf10447ce3d7ae99f41
--- /dev/null
+++ b/printing/pdf_transform.h
@@ -0,0 +1,104 @@
+// Copyright 2015 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_PDF_TRANSFORM_H_
+#define PRINTING_PDF_TRANSFORM_H_
+
+#include "printing/printing_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace printing {
+
+// A rect struct for use with FPDF bounding box functions.
+// With PDFs, origin is bottom-left.
+struct PRINTING_EXPORT ClipBox {
+  float left;
+  float right;
+  float top;
+  float bottom;
+};
+
+// Calculate the scale factor between |content_rect| and a page of size
+// |src_width| x |src_height|.
+//
+// |content_rect| specifies the printable area of the destination page, with
+// origin at left-bottom. Values are in points.
+// |src_width| specifies the source page width in points.
+// |src_height| specifies the source page height in points.
+// |rotated| True if source page is rotated 90 degree or 270 degree.
+PRINTING_EXPORT double CalculateScaleFactor(const gfx::Rect& content_rect,
+                                            double src_width,
+                                            double src_height,
+                                            bool rotated);
+
+// Make the default size to be letter size (8.5" X 11"). We are just following
+// the PDFium way of handling these corner cases. PDFium always consider
+// US-Letter as the default page size.
+PRINTING_EXPORT void SetDefaultClipBox(bool rotated, ClipBox* clip_box);
+
+// Set the media box and/or crop box as needed. If both boxes are there, then
+// nothing needs to be done. If one box is missing, then fill it with the value
+// from the other box. If both boxes are missing, then they both get the default
+// value from SetDefaultClipBox(), based on |rotated|.
+PRINTING_EXPORT void CalculateMediaBoxAndCropBox(bool rotated,
+                                                 bool has_media_box,
+                                                 bool has_crop_box,
+                                                 printing::ClipBox* media_box,
+                                                 printing::ClipBox* crop_box);
+
+// Compute source clip box boundaries based on the crop box / media box of
+// source page and scale factor.
+// Returns the computed source clip box values.
+//
+// |media_box| The PDF's media box.
+// |crop_box| The PDF's crop box.
+PRINTING_EXPORT ClipBox CalculateClipBoxBoundary(const ClipBox& media_box,
+                                                 const ClipBox& crop_box);
+
+// Scale |box| by |scale_factor|.
+PRINTING_EXPORT void ScaleClipBox(double scale_factor, ClipBox* box);
+
+// Calculate the clip box translation offset for a page that does need to be
+// scaled. All parameters are in points.
+//
+// |content_rect| specifies the printable area of the destination page, with
+// origin at left-bottom.
+// |source_clip_box| specifies the source clip box positions, relative to
+// origin at left-bottom.
+// |offset_x| and |offset_y| will contain the final translation offsets for the
+// source clip box, relative to origin at left-bottom.
+PRINTING_EXPORT void CalculateScaledClipBoxOffset(
+    const gfx::Rect& content_rect,
+    const ClipBox& source_clip_box,
+    double* offset_x,
+    double* offset_y);
+
+// Calculate the clip box offset for a page that does not need to be scaled.
+// All parameters are in points.
+//
+// |content_rect| specifies the printable area of the destination page, with
+// origin at left-bottom.
+// |rotation| specifies the source page rotation values which are N / 90
+// degrees.
+// |page_width| specifies the screen destination page width.
+// |page_height| specifies the screen destination page height.
+// |source_clip_box| specifies the source clip box positions, relative to origin
+// at left-bottom.
+// |offset_x| and |offset_y| will contain the final translation offsets for the
+// source clip box, relative to origin at left-bottom.
+PRINTING_EXPORT void CalculateNonScaledClipBoxOffset(
+    const gfx::Rect& content_rect,
+    int rotation,
+    int page_width,
+    int page_height,
+    const ClipBox& source_clip_box,
+    double* offset_x,
+    double* offset_y);
+
+}  // namespace printing
+
+#endif  // PRINTING_PDF_TRANSFORM_H_