| Summary: | Circular shading is pixelated | ||
|---|---|---|---|
| Product: | poppler | Reporter: | dave lepore <dave.lepore> |
| Component: | general | Assignee: | poppler-bugs <poppler-bugs> |
| Status: | RESOLVED FIXED | QA Contact: | |
| Severity: | normal | ||
| Priority: | medium | CC: | obscurans |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
pixelated circular shading
pixelated circular shading Implement cairo function shading |
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Created attachment 112209 [details]
pixelated circular shading
Created attachment 112285 [details] [review] Implement cairo function shading The pdf contains a function based shading. Gfx subdivides the shading then draws each cell with a solid color resulting in a pixelated appearance for both cairo and splash. This could be fixed by reducing the size of each cell to 1 pixel. However this could significantly increase rendering time as the function has to be evaluated for each pixel. The better fix is to interpolate the colors in each cell instead of using solid fills. I've fixed this for the cairo backend by using cairo mesh gradients to interpolate the colors in each cell. I should also point out that the conical gradient in this particular pdf could have been created with a type 6 shading (coons patch meshes). This would produce a better result and does not rely on evaluating a type 4 PostScript calculator function. Pushed, sorry for the delay reviewing this. Thanks! |
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Created attachment 112208 [details] pixelated circular shading When the attached pdf is opened with a poppler based viewer the circular shading is rendered in a pixelated fashion, while in other viewer it looks smooth.