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---------------------------------------------------------------------- 

----------------------------------------------------------------------
 Modified Files:
 	ChangeLog app/pixel_region.c
	Optimized pixel_region_{get,set}_{row,col}
 ----------------------------------------------------------------------
This commit is contained in:
jaycox 1998-07-25 11:24:09 +00:00
parent d95ac866e6
commit 8ac24a56d9
3 changed files with 75 additions and 28 deletions
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5
ChangeLog
View File

@ -1,3 +1,8 @@
Sat Jul 25 04:11:31 PDT 1998 Jay Cox <jaycox@earthlink.net>
* app/pixel_region.c: optimized pixel_region_[gs]et_row,
minor optimization to pixel_region_[gs]et_col
Sat Jul 25 11:09:58 BST 1998 Adam D. Moss <adam@gimp.org>
* app/convert.c: Convert-to-indexed now remembers the last

49
app/base/pixel-region.c
View File

@ -135,6 +135,7 @@ pixel_region_get_row (PR, x, y, w, data, subsample)
int end;
int boundary;
int b;
int npixels;
end = x + w;
@ -144,16 +145,28 @@ pixel_region_get_row (PR, x, y, w, data, subsample)
{
tile = tile_manager_get_tile (PR->tiles, x, y, 0, TRUE, FALSE);
tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
boundary = x + (tile->ewidth - (x % TILE_WIDTH));
inc = subsample * tile->bpp;
npixels = tile->ewidth - (x % TILE_WIDTH);
for ( ; x < end && x < boundary; x += subsample)
if ((x + npixels) > end) /* make sure we don't write past the end */
npixels = end - x;
if (subsample == 1) /* optimize for the common case */
{
memcpy(data, tile_data, tile->bpp*npixels);
data += tile->bpp*npixels;
x += npixels;
}
else
{
boundary = x + npixels;
inc = subsample * tile->bpp;
for ( ; x < boundary; x += subsample)
{
for (b = 0; b < tile->bpp; b++)
*data++ = tile_data[b];
tile_data += inc;
}
}
tile_release (tile, FALSE);
}
}
@ -169,8 +182,7 @@ pixel_region_set_row (PR, x, y, w, data)
Tile *tile;
unsigned char *tile_data;
int end;
int boundary;
int b;
int npixels;
end = x + w;
@ -180,13 +192,16 @@ pixel_region_set_row (PR, x, y, w, data)
{
tile = tile_manager_get_tile (PR->tiles, x, y, 0, TRUE, TRUE);
tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
boundary = x + (tile->ewidth - (x % TILE_WIDTH));
for ( ; x < end && x < boundary; x++)
{
for (b = 0; b < tile->bpp; b++)
*tile_data++ = *data++;
}
npixels = tile->ewidth - (x % TILE_WIDTH);
if ((x + npixels) > end) /* make sure we don't write past the end */
npixels = end - x;
memcpy(tile_data, data, tile->bpp*npixels);
data += tile->bpp*npixels;
x += npixels;
tile_release (tile, TRUE);
}
@ -217,9 +232,12 @@ pixel_region_get_col (PR, x, y, h, data, subsample)
tile = tile_manager_get_tile (PR->tiles, x, y, 0, TRUE, FALSE);
tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
boundary = y + (tile->eheight - (y % TILE_HEIGHT));
if (boundary > end) /* make sure we don't write past the end */
boundary = end;
inc = subsample * tile->bpp * tile->ewidth;
for ( ; y < end && y < boundary; y += subsample)
for ( ; y < boundary; y += subsample)
{
for (b = 0; b < tile->bpp; b++)
*data++ = tile_data[b];
@ -256,7 +274,10 @@ pixel_region_set_col (PR, x, y, h, data)
boundary = y + (tile->eheight - (y % TILE_HEIGHT));
inc = tile->bpp * tile->ewidth;
for ( ; y < end && y < boundary; y++)
if (boundary > end) /* make sure we don't write past the end */
boundary = end;
for ( ; y < boundary; y++)
{
for (b = 0; b < tile->bpp; b++)
tile_data[b] = *data++;

49
app/pixel_region.c
View File

@ -135,6 +135,7 @@ pixel_region_get_row (PR, x, y, w, data, subsample)
int end;
int boundary;
int b;
int npixels;
end = x + w;
@ -144,16 +145,28 @@ pixel_region_get_row (PR, x, y, w, data, subsample)
{
tile = tile_manager_get_tile (PR->tiles, x, y, 0, TRUE, FALSE);
tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
boundary = x + (tile->ewidth - (x % TILE_WIDTH));
inc = subsample * tile->bpp;
npixels = tile->ewidth - (x % TILE_WIDTH);
for ( ; x < end && x < boundary; x += subsample)
if ((x + npixels) > end) /* make sure we don't write past the end */
npixels = end - x;
if (subsample == 1) /* optimize for the common case */
{
memcpy(data, tile_data, tile->bpp*npixels);
data += tile->bpp*npixels;
x += npixels;
}
else
{
boundary = x + npixels;
inc = subsample * tile->bpp;
for ( ; x < boundary; x += subsample)
{
for (b = 0; b < tile->bpp; b++)
*data++ = tile_data[b];
tile_data += inc;
}
}
tile_release (tile, FALSE);
}
}
@ -169,8 +182,7 @@ pixel_region_set_row (PR, x, y, w, data)
Tile *tile;
unsigned char *tile_data;
int end;
int boundary;
int b;
int npixels;
end = x + w;
@ -180,13 +192,16 @@ pixel_region_set_row (PR, x, y, w, data)
{
tile = tile_manager_get_tile (PR->tiles, x, y, 0, TRUE, TRUE);
tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
boundary = x + (tile->ewidth - (x % TILE_WIDTH));
for ( ; x < end && x < boundary; x++)
{
for (b = 0; b < tile->bpp; b++)
*tile_data++ = *data++;
}
npixels = tile->ewidth - (x % TILE_WIDTH);
if ((x + npixels) > end) /* make sure we don't write past the end */
npixels = end - x;
memcpy(tile_data, data, tile->bpp*npixels);
data += tile->bpp*npixels;
x += npixels;
tile_release (tile, TRUE);
}
@ -217,9 +232,12 @@ pixel_region_get_col (PR, x, y, h, data, subsample)
tile = tile_manager_get_tile (PR->tiles, x, y, 0, TRUE, FALSE);
tile_data = tile->data + tile->bpp * (tile->ewidth * (y % TILE_HEIGHT) + (x % TILE_WIDTH));
boundary = y + (tile->eheight - (y % TILE_HEIGHT));
if (boundary > end) /* make sure we don't write past the end */
boundary = end;
inc = subsample * tile->bpp * tile->ewidth;
for ( ; y < end && y < boundary; y += subsample)
for ( ; y < boundary; y += subsample)
{
for (b = 0; b < tile->bpp; b++)
*data++ = tile_data[b];
@ -256,7 +274,10 @@ pixel_region_set_col (PR, x, y, h, data)
boundary = y + (tile->eheight - (y % TILE_HEIGHT));
inc = tile->bpp * tile->ewidth;
for ( ; y < end && y < boundary; y++)
if (boundary > end) /* make sure we don't write past the end */
boundary = end;
for ( ; y < boundary; y++)
{
for (b = 0; b < tile->bpp; b++)
tile_data[b] = *data++;