Printing: Take the PDF rotation into account when printing on Mac.
Derived from worksheet attached to https://code.google.com/p/chromium/issues/detail?id=369206#c17 BUG=369206 TEST=Manual, see bug. Review URL: https://codereview.chromium.org/611693002 Cr-Commit-Position: refs/heads/master@{#297114}
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@ -40,6 +40,39 @@ namespace {
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base::LazyInstance<base::ThreadLocalPointer<struct __CFSet> >::Leaky
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thread_pdf_docs = LAZY_INSTANCE_INITIALIZER;
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// Rotate a page by |num_rotations| * 90 degrees, counter-clockwise.
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void RotatePage(CGContextRef context, const CGRect rect, int num_rotations) {
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switch (num_rotations) {
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case 0:
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break;
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case 1:
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// After rotating by 90 degrees with the axis at the origin, the page
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// content is now "off screen". Shift it right to move it back on screen.
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CGContextTranslateCTM(context, rect.size.width, 0);
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// Rotates counter-clockwise by 90 degrees.
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CGContextRotateCTM(context, M_PI_2);
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break;
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case 2:
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// After rotating by 180 degrees with the axis at the origin, the page
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// content is now "off screen". Shift it right and up to move it back on
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// screen.
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CGContextTranslateCTM(context, rect.size.width, rect.size.height);
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// Rotates counter-clockwise by 90 degrees.
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CGContextRotateCTM(context, M_PI);
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break;
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case 3:
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// After rotating by 270 degrees with the axis at the origin, the page
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// content is now "off screen". Shift it right to move it back on screen.
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CGContextTranslateCTM(context, 0, rect.size.height);
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// Rotates counter-clockwise by 90 degrees.
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CGContextRotateCTM(context, -M_PI_2);
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break;
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default:
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NOTREACHED();
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break;
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};
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}
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} // namespace
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namespace printing {
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@ -182,6 +215,7 @@ bool PdfMetafileCg::RenderPage(unsigned int page_number,
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}
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CGPDFPageRef pdf_page = CGPDFDocumentGetPage(pdf_doc, page_number);
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CGRect source_rect = CGPDFPageGetBoxRect(pdf_page, kCGPDFCropBox);
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int pdf_src_rotation = CGPDFPageGetRotationAngle(pdf_page);
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float scaling_factor = 1.0;
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const bool source_is_landscape =
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(source_rect.size.width > source_rect.size.height);
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@ -224,13 +258,21 @@ bool PdfMetafileCg::RenderPage(unsigned int page_number,
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// i.e. the origin offset translation happens first.
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// Origin is at bottom-left.
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CGContextTranslateCTM(context, x_offset, y_offset);
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int num_rotations = 0;
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if (rotate) {
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// After rotating by 90 degrees with the axis at the origin, the page
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// content is now "off screen". Shift it right to move it back on screen.
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CGContextTranslateCTM(context, rect.size.width, 0);
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// Rotates counter-clockwise by 90 degrees.
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CGContextRotateCTM(context, M_PI_2);
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if (pdf_src_rotation == 0 || pdf_src_rotation == 270) {
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num_rotations = 1;
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} else {
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num_rotations = 3;
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}
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} else {
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if (pdf_src_rotation == 180 || pdf_src_rotation == 270) {
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num_rotations = 2;
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}
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}
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RotatePage(context, rect, num_rotations);
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CGContextScaleCTM(context, scaling_factor, scaling_factor);
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CGContextTranslateCTM(context, x_origin_offset, y_origin_offset);
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