len0rd/rockbox
1
0
Fork 1
mirror of https://github.com/Rockbox/rockbox.git synced 2025-10-13 18:17:39 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Use pre-multiplication in scaler to save one multiply per color component on ARM and Coldfire, at the cost of an extra add/shift in the horizontal scaler to reduce values to a workable range. SH-1 retains the same basic math, as

Browse source 
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
This commit is contained in:
Andrew Mahone 2009-05-26 20:00:47 +00:00
parent c4ed88f593
commit 92785b8f2f
5 changed files with 356 additions and 212 deletions
Download patch file Download diff file Expand all files Collapse all files

2
apps/plugins/lib/grey_draw.c
View file

@ -733,7 +733,7 @@ static void output_row_grey_32(uint32_t row, void * row_in,
uint32_t *qp = (uint32_t*)row_in;
uint8_t *dest = (uint8_t*)ctx->bm->data + ctx->bm->width * row;
for (col = 0; col < ctx->bm->width; col++)
*dest++ = SC_MUL((*qp++) + ctx->round,ctx->divisor);
*dest++ = SC_OUT(*qp++, ctx);
}
static unsigned int get_size_grey(struct bitmap *bm)