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Greyscale library: Assembler optimised update for coldfire, ~73% speedup when using IRAM, ~35% speedup without IRAM. Slight optimisation for other targets as well.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16482 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-03-02 17:05:00 +00:00
parent 1509faf618
commit 52e1f81599
4 changed files with 149 additions and 4 deletions
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19
apps/plugins/lib/grey_draw.c
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@ -586,11 +586,17 @@ void grey_ub_clear_display(void)
#endif
}
/* Assembler optimised helper function for copying a single line to the
* greyvalue buffer. */
void _grey_line1(int width, unsigned char *dst, const unsigned char *src,
const unsigned char *lut);
/* Draw a partial greyscale bitmap, canonical format */
void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
int stride, int x, int y, int width, int height)
{
int yc, ye;
unsigned char *dst;
/* nothing to draw? */
if ((width <= 0) || (height <= 0) || (x >= _grey_info.width)
@ -618,16 +624,22 @@ void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
src += _GREY_MULUQ(stride, src_y) + src_x; /* move starting point */
yc = y;
ye = y + height;
dst = _grey_info.values + (x << _GREY_BSHIFT);
do
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
int idx = _GREY_MULUQ(_grey_info.width, yc) + x;
int idx = _GREY_MULUQ(_grey_info.width, yc);
#else
int idx = _GREY_MULUQ(_grey_info.width, yc & ~_GREY_BMASK)
+ (x << _GREY_BSHIFT) + (~yc & _GREY_BMASK);
+ (~yc & _GREY_BMASK);
#endif /* LCD_PIXELFORMAT */
unsigned char *dst_row = _grey_info.values + idx;
#if (LCD_PIXELFORMAT == VERTICAL_PACKING) && (LCD_DEPTH == 2) \
&& defined(CPU_COLDFIRE)
_grey_line1(width, dst + idx, src, _grey_info.gvalue);
#else
unsigned char *dst_row = dst + idx;
const unsigned char *src_row = src;
const unsigned char *src_end = src + width;
@ -637,6 +649,7 @@ void grey_ub_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
dst_row += _GREY_BSIZE;
}
while (src_row < src_end);
#endif
src += stride;
}