[poppler] [PATCH] Arthur backend fixes; poppler-qt4 direct rendering

Pino Toscano pino at kde.org
Fri Nov 5 17:08:51 PDT 2010


Alle lunedì 1 novembre 2010, Matthias Fauconneau ha scritto:
> The first patch contains two easy fixes for Arthur :
> - font rendering (transforming the glyph path and not only the glyph
> origin).
> - image rendering (alpha was set to zero).

- try to avoid mixing indentation and actual code changes, they make 
reviewing the changes a bit difficult
- using QImage::scanLine() can be not that fast, especially if called 
repeately. much better if you iterate "by row" manually yourself of the 
image buffer
- in the past I had issues with Format_RGB32 and the alpha pixels not 
being totally opaque (ie 0xff): you can just use ARGB32 for both the 
cases (creating the QImage out of the if(), and on stack) and reset to 
0xff the alpha values

> The second patch expose the QPainter interface directly through a
> renderToPainter method which use an existing painter instead of
> creating an image.

I'm not sure to like the implementation of basically making (again) a 
rendering method specific to a backend, with a generic method...
Anyway, for renderToPainter:
- it should check for the painter pointer (if 0)
- it should have a parameter of a flag type for options for the "painter 
  way" rendering
- it should by default save+restore the painter, to avoid messying a
  caller-owned painter; the flag parameter proposed above should have an 
  enum saying to avoid this save/restore job (similar to QGraphicsItem);
  renderToImag should use this enum value, of course
- "renderToPainter(&painter,xres,yres,x,y,w,h,rotate);"
  please add spaces after commas

Pino Toscano
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