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optimized the rendering of fully opaque regions.

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2007-10-09  Sven Neumann  <sven@gimp.org>

	* app/base/tile-pyramid.c (tile_pyramid_write_quarter): optimized
	the rendering of fully opaque regions.

svn path=/trunk/; revision=23778
This commit is contained in:
Sven Neumann 2007-10-09 15:46:44 +00:00 committed by Sven Neumann
parent 7aa728b0e0
commit 161ed9623f
2 changed files with 39 additions and 18 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2007-10-09 Sven Neumann <sven@gimp.org>
* app/base/tile-pyramid.c (tile_pyramid_write_quarter): optimized
the rendering of fully opaque regions.
2007-10-09 Sven Neumann <sven@gimp.org>
* app/base/tile.[ch]

52
app/base/tile-pyramid.c
View file

@ -420,7 +420,7 @@ tile_pyramid_write_quarter (Tile *dest,
case 1:
for (x = 0; x < src_ewidth / 2; x++)
{
dst[0] = (src0[0] + src1[0] + src2[0] + src3[0]) / 4;
dst[0] = (src0[0] + src1[0] + src2[0] + src3[0]) >> 2;
dst += 1;
@ -434,19 +434,26 @@ tile_pyramid_write_quarter (Tile *dest,
case 2:
for (x = 0; x < src_ewidth / 2; x++)
{
gint a = src0[1] + src1[1] + src2[1] + src3[1];
guint a = src0[1] + src1[1] + src2[1] + src3[1];
if (a)
switch (a)
{
case 0: /* all transparent */
dst[0] = dst[1] = 0;
break;
case 1020: /* all opaque */
dst[0] = (src0[0] + src1[0] + src2[0] + src3[0]) >> 2;
dst[1] = 255;
break;
default:
dst[0] = ((src0[0] * src0[1] +
src1[0] * src1[1] +
src2[0] * src2[1] +
src3[0] * src3[1]) / a);
dst[1] = a / 4;
}
else
{
dst[0] = dst[1] = 0;
dst[1] = a >> 2;
break;
}
dst += 2;
@ -461,9 +468,9 @@ tile_pyramid_write_quarter (Tile *dest,
case 3:
for (x = 0; x < src_ewidth / 2; x++)
{
dst[0] = (src0[0] + src1[0] + src2[0] + src3[0]) / 4;
dst[1] = (src0[1] + src1[1] + src2[1] + src3[1]) / 4;
dst[2] = (src0[2] + src1[2] + src2[2] + src3[2]) / 4;
dst[0] = (src0[0] + src1[0] + src2[0] + src3[0]) >> 2;
dst[1] = (src0[1] + src1[1] + src2[1] + src3[1]) >> 2;
dst[2] = (src0[2] + src1[2] + src2[2] + src3[2]) >> 2;
dst += 3;
@ -477,10 +484,22 @@ tile_pyramid_write_quarter (Tile *dest,
case 4:
for (x = 0; x < src_ewidth / 2; x++)
{
gint a = src0[3] + src1[3] + src2[3] + src3[3];
guint a = src0[3] + src1[3] + src2[3] + src3[3];
if (a)
switch (a)
{
case 0: /* all transparent */
dst[0] = dst[1] = dst[2] = dst[3] = 0;
break;
case 1020: /* all opaque */
dst[0] = (src0[0] + src1[0] + src2[0] + src3[0]) >> 2;
dst[1] = (src0[1] + src1[1] + src2[1] + src3[1]) >> 2;
dst[2] = (src0[2] + src1[2] + src2[2] + src3[2]) >> 2;
dst[3] = 255;
break;
default:
dst[0] = ((src0[0] * src0[3] +
src1[0] * src1[3] +
src2[0] * src2[3] +
@ -493,11 +512,8 @@ tile_pyramid_write_quarter (Tile *dest,
src1[2] * src1[3] +
src2[2] * src2[3] +
src3[2] * src3[3]) / a);
dst[3] = a / 4;
}
else
{
dst[0] = dst[1] = dst[2] = dst[3] = 0;
dst[3] = a >> 2;
break;
}
dst += 4;