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fb_generic: add swidth variable, "stride in fb_pixel_t units"

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this should allow to use fb_pixel_t pointer arithmetics more often
instead of byte pointers


Origin commit data
------------------
Commit: 7c7d5f08dd
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2017-02-15 (Wed, 15 Feb 2017)
This commit is contained in:
Stefan Seyfried
2017-02-15 20:30:52 +01:00
committed by Michael Liebmann
parent 8cad1eb1a8
commit 0f4ed6c34a
8 changed files with 12 additions and 9 deletions
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3
src/driver/fb_accel_td.cpp
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@@ -156,6 +156,7 @@ void CFbAccelTD::init(const char *)
lbb = lfb; /* the memory area to draw to... */
available = fix.smem_len;
stride = fix.line_length;
swidth = stride / sizeof(fb_pixel_t);
xRes = screeninfo.xres;
yRes = screeninfo.yres;
bpp = screeninfo.bits_per_pixel;
@@ -169,7 +170,7 @@ int CFbAccelTD::setMode(unsigned int, unsigned int, unsigned int)
int needmem = stride * yRes * 2;
if (available >= needmem)
{
backbuffer = lfb + stride / sizeof(fb_pixel_t) * yRes;
backbuffer = lfb + swidth * yRes;
return 0;
}
fprintf(stderr, LOGTAG " not enough FB memory (have %d, need %d)\n", available, needmem);