176933 - Print filled rectangles instead of one-color-images

Status: RESOLVED WONTFIX

(Core :: Printing: Output, enhancement)

Description

[Roland Mainz]

[This is a spin-off of bug 156933 - "draw filled rectangles instead of
one-color-images"]

From bug 156933:
-- snip --
It is quite common for HTML authors to use images (<IMG ...> tags) - mostly tiny
or 1x1 pixel size ones - to fill rectangles with a color, most often table cells
or such, but they even draw lines with that.

For a PDF writer module I implemented an extremely simple optimization that has
quite a nice effect: Before drawing an image, I simply check whether all pixels
of the image have the same color, and if so, I substitute the image by a solid
filled rectangle of the same size. This saves tremendous amounts of space,
printing- and rendering-performance for some web-pages.

Of course, such an optimization could be even more efficiently done at a
"higher" level, when reading the image for example. Then not only one output
device but all would benefit.
-- snip --

Comment 1

[Roland Mainz]

Swapping QA<--->Owner...