diff options
| -rw-r--r-- | printing/pdf_metafile_cg_mac.cc | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/printing/pdf_metafile_cg_mac.cc b/printing/pdf_metafile_cg_mac.cc index 47915d1..1bc1693 100644 --- a/printing/pdf_metafile_cg_mac.cc +++ b/printing/pdf_metafile_cg_mac.cc @@ -40,6 +40,39 @@ namespace { base::LazyInstance<base::ThreadLocalPointer<struct __CFSet> >::Leaky thread_pdf_docs = LAZY_INSTANCE_INITIALIZER; +// Rotate a page by |num_rotations| * 90 degrees, counter-clockwise. +void RotatePage(CGContextRef context, const CGRect rect, int num_rotations) { + switch (num_rotations) { + case 0: + break; + case 1: + // After rotating by 90 degrees with the axis at the origin, the page + // content is now "off screen". Shift it right to move it back on screen. + CGContextTranslateCTM(context, rect.size.width, 0); + // Rotates counter-clockwise by 90 degrees. + CGContextRotateCTM(context, M_PI_2); + break; + case 2: + // After rotating by 180 degrees with the axis at the origin, the page + // content is now "off screen". Shift it right and up to move it back on + // screen. + CGContextTranslateCTM(context, rect.size.width, rect.size.height); + // Rotates counter-clockwise by 90 degrees. + CGContextRotateCTM(context, M_PI); + break; + case 3: + // After rotating by 270 degrees with the axis at the origin, the page + // content is now "off screen". Shift it right to move it back on screen. + CGContextTranslateCTM(context, 0, rect.size.height); + // Rotates counter-clockwise by 90 degrees. + CGContextRotateCTM(context, -M_PI_2); + break; + default: + NOTREACHED(); + break; + }; +} + } // namespace namespace printing { @@ -182,6 +215,7 @@ bool PdfMetafileCg::RenderPage(unsigned int page_number, } CGPDFPageRef pdf_page = CGPDFDocumentGetPage(pdf_doc, page_number); CGRect source_rect = CGPDFPageGetBoxRect(pdf_page, kCGPDFCropBox); + int pdf_src_rotation = CGPDFPageGetRotationAngle(pdf_page); float scaling_factor = 1.0; const bool source_is_landscape = (source_rect.size.width > source_rect.size.height); @@ -224,13 +258,21 @@ bool PdfMetafileCg::RenderPage(unsigned int page_number, // i.e. the origin offset translation happens first. // Origin is at bottom-left. CGContextTranslateCTM(context, x_offset, y_offset); + + int num_rotations = 0; if (rotate) { - // After rotating by 90 degrees with the axis at the origin, the page - // content is now "off screen". Shift it right to move it back on screen. - CGContextTranslateCTM(context, rect.size.width, 0); - // Rotates counter-clockwise by 90 degrees. - CGContextRotateCTM(context, M_PI_2); + if (pdf_src_rotation == 0 || pdf_src_rotation == 270) { + num_rotations = 1; + } else { + num_rotations = 3; + } + } else { + if (pdf_src_rotation == 180 || pdf_src_rotation == 270) { + num_rotations = 2; + } } + RotatePage(context, rect, num_rotations); + CGContextScaleCTM(context, scaling_factor, scaling_factor); CGContextTranslateCTM(context, x_origin_offset, y_origin_offset); |