| // Copyright 2015 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef PDF_PDF_TRANSFORM_H_ |
| #define PDF_PDF_TRANSFORM_H_ |
| |
| namespace gfx { |
| class PointF; |
| class Rect; |
| class SizeF; |
| } // namespace gfx |
| |
| namespace chrome_pdf { |
| |
| // All the code here works in the PDF coordinate space. The origin is at the |
| // bottom-left, and all units are in points. |
| |
| // A rect struct for use with FPDF bounding box functions. |
| struct PdfRectangle { |
| float left; |
| float bottom; |
| float right; |
| float top; |
| }; |
| |
| // Calculate the scale factor between `content_rect` and a page of `src_size`. |
| // |
| // `content_rect` specifies the printable area of the destination page. |
| // `src_size` specifies the source page size. |
| // `rotated` True if source page is rotated 90 degree or 270 degree. |
| float CalculateScaleFactor(const gfx::Rect& content_rect, |
| const gfx::SizeF& src_size, |
| 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. |
| void SetDefaultClipBox(bool rotated, PdfRectangle* 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`. |
| void CalculateMediaBoxAndCropBox(bool rotated, |
| bool has_media_box, |
| bool has_crop_box, |
| PdfRectangle* media_box, |
| PdfRectangle* 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. |
| PdfRectangle CalculateClipBoxBoundary(const PdfRectangle& media_box, |
| const PdfRectangle& crop_box); |
| |
| // Scale `rect` by `scale_factor`. |
| void ScalePdfRectangle(float scale_factor, PdfRectangle* rect); |
| |
| // Calculate the clip box translation offset for a page that does need to be |
| // scaled. |
| // |
| // `content_rect` specifies the printable area of the destination page. |
| // `source_clip_box` specifies the source clip box positions, relative to the |
| // origin. |
| // Returns the final translation offsets for the source clip box, relative to |
| // the origin. |
| gfx::PointF CalculateScaledClipBoxOffset(const gfx::Rect& content_rect, |
| const PdfRectangle& source_clip_box); |
| |
| // Calculate the clip box offset for a page that does not need to be scaled. |
| // |
| // `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 the |
| // origin. |
| // Returns the final translation offsets for the source clip box, relative to |
| // the origin. |
| gfx::PointF CalculateNonScaledClipBoxOffset( |
| int rotation, |
| int page_width, |
| int page_height, |
| const PdfRectangle& source_clip_box); |
| |
| } // namespace chrome_pdf |
| |
| #endif // PDF_PDF_TRANSFORM_H_ |