NewImageJPEG always returns nullptr

Einstein
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IP: 192.168.0.71 11 years 9 months ago - 11 years 9 months ago #6701 by Einstein

Replied by Einstein on topic NewImageJPEG always returns nullptr

Code:

PDFMatrix mat = new PDFMatrix(m_scale, -m_scale, 0, m_dibh);

In which units should m_dibh be specified? I discovered that if I put my document's height converted to device-independent pixels (DIP), the generated image is positioned too low.

When trying to render a 1405 x 1987 image, with the identity matrix, the point x: 0, y: 0 in not in the left bottom corner but somewhere on the left edge.

Last edit: 11 years 9 months ago by tien4720.

radaee
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IP: 192.168.0.71 11 years 9 months ago #6703 by radaee

Replied by radaee on topic NewImageJPEG always returns nullptr

full codes like this:

Code:

m_dibw = m_scale * Page.Width;//Page.Width is in PDF coordinate.
m_dibh = m_scale * Page.Height//Page.Height is in PDF coordinate.
Matrix mat = new Matrix( m_scale, -m_scale, 0, m_dinh );

m_dib_tmp = new WriteableBitmap(m_dibw, m_dibh);
int[] pixels = m_dib_tmp.Pixels;

Page.Render(pixels, m_dibw, m_dibh, mat, true, PDFView.renderQuality);

Time to create page: 0.433 seconds