Now 32bit BMPs with alpha channel can be up- and downscaled without losing
transparency information.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30938 a1c6a512-1295-4272-9138-f99709370657
the use of 16x16->32 hardware multiplication in the earlier scaler stages saves more than removing the 32x32->40 multiply to descale output.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21091 a1c6a512-1295-4272-9138-f99709370657
on sh, use 8.24 fixed-point C math for final division in scaler
on coldfire, use 8.32 fixed-point via emac
on other architectures, use 8.32 fixed-point C math
use shift-and-add to divide when adjusting scale factors in pictureflow
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19802 a1c6a512-1295-4272-9138-f99709370657
wrapper C files in pluginlib renamed to the same name as the core files they
wrap
pluginlib-only init functions for resize and bmp moved into the wrapper files,
and declared in the associated header files
API() macro removed entirely, in favor of a core-only header file that
redefines core function names to use a plugin_api pointer
some unnecessary uses of PLUGIN in apps/recorder/bmp.c removed
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19712 a1c6a512-1295-4272-9138-f99709370657
pluginlib for use with greylib, and add source for a test scaled bmp
viewer using greylib.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19593 a1c6a512-1295-4272-9138-f99709370657
Macros for calculating size needed for bitmap load and scaling, so that
these can be compile-time constant when their inputs are.
Reduce size of bayer dither by chopping all but first row of dither
matrix, and replacing 2D lookup with 1D lookup and small calculation.
Move some functions not related to actual bmp file loading out of bmp.c.
A smaller brightness() for mono targets, and a higher-quality one for
greyscale targets, both replacing the division by 10 with a shift.
Port of the linear and area scalers to greyscale targets, this costs
some binsize but produces better output even when dithered to 2bpp.
Move duplicated row output code from inside vertical scalers to a
separate row output function.
Move some multiplies out of the line scaler, for a small speedup and
code size reduction, as well as a small improvement in accuracy for the
upscaling case.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19592 a1c6a512-1295-4272-9138-f99709370657
