blending modes layer are not exported well if resolution is high

[qgib]

Author Name: Regis Haubourg (@haubourg)
Original Redmine Issue: 7926
Affected QGIS version: master

Assignee: Vincent Mora

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High,
when exporting a composer in raster mode (A0 or A1), when asking for higher dpi, layers with blending mode are not rendered.
I have a A1 composition , export is ok in up to 220 dpi. When asking 250 or higher, I loose those layers
With A0 same composition, the threshold is lower 50 dpi is KO.

See attached screenshot.

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• bug_blending_export.jpg (Regis Haubourg)

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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Regis, this might be "fixed" by this bed65cb

The above introduces a warning message when running out of memory while exporting to image. Could you check and confirm?

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• category_id was configured as 33

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Nathan Woodrow (@NathanW2)

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Regis can we get a update on this if you are still having the same issue.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Nathan Woodrow wrote:

Regis can we get a update on this if you are still having the same issue.

isn't this another side of the printing memory issue on Windows? See for example #14667 (comment)

[qgib]

Author Name: Hugo Mercier (@mhugo)

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Reproduced on a Windows 32 bits. Can't reproduce on a Linux 64 bits.
Not sure yet if it is related to #14667
Seems related to a memory issue.

Working on it

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• assigned_to_id was configured as Hugo Mercier
• status_id was changed from Feedback to In Progress

[qgib]

Author Name: Vincent Mora (@vmora)

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We found the problem with Hugo in QgsMapRenderer::render where an image could not be allocated (too big). The fix is here:

#776

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• status_id was changed from In Progress to Resolved
• assigned_to_id was changed from Hugo Mercier to Vincent Mora
• resolution was changed from to fixed
• pull_request_patch_supplied was changed from 0 to 1

[qgib]

Author Name: Nathan Woodrow (@NathanW2)

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Fixed in changeset "812d1ed1d8fe4f9b38d54160beed034bd57e0ae9".

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• status_id was changed from Resolved to Closed

[qgib]

Author Name: Vincent Mora (@vmora)

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Bug fixed thanks to fundings from Agence de l'Eau Adour-Garonne.