Sort out image support in reports

[nahueespinosa]

Description

When using Sphinx for PDF report generation (#20), we need to rely on ImageConverters to convert images that are not supported by the builder (pdflatex only supports PDF, PNG and JPEG image formats).

The current implementation of ImageConverter only uses the image basename to store the converted image in the images directory. This means that if we have an image with the same name in different subdirectories, the converted images will overwrite each other. See this handle function and this utility function using the basename of the source path.

Definition of Done

• Add support for SVG, PGM and other image formats to lambkin report generation process.

Additional considerations

Possible solutions:

• We can have the user specify a given output image format to lambkin during benchmark configuration, so we generate the formats supported by the builder.
• We could flatten the image paths before generating the report and use ImageConverters.
• We could submit a patch upstream and hope for the best.

[hidmic]

We could submit a patch upstream and hope for the best.

This one would be best, but yeah, I fear Sphinx release cadence.

We can have the user specify a given output image format to lambkin during benchmark configuration, so we generate the formats supported by the builder.

Now that I think of it, we should probably always generate PNGs. AFAIK it's the PDF of image formats.

[hidmic]

I think that, for the time being, switching to PNG images is probably simplest so I'll go for it.

[hidmic]

As of #35, we use PNGs everywhere.