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applied some simple but effective optimizations to

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2001-08-19  Sven Neumann  <sven@gimp.org>

	* pixops/pixops.c: applied some simple but effective optimizations
	to pixops_composite_nearest() and pixops_composite_color_nearest().
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Sven Neumann 2001-08-19 10:48:24 +00:00 committed by Sven Neumann
parent 112eb9b2e5
commit 8b89f18577
2 changed files with 72 additions and 48 deletions
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5
gdk-pixbuf/ChangeLog
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@ -1,3 +1,8 @@
2001-08-19 Sven Neumann <sven@gimp.org>
* pixops/pixops.c: applied some simple but effective optimizations
to pixops_composite_nearest() and pixops_composite_color_nearest().
2001-08-07 Sven Neumann <sven@gimp.org> 2001-08-07 Sven Neumann <sven@gimp.org>
* gdk-pixbuf.c (gdk_pixbuf_fill): a comment asked to optimize this * gdk-pixbuf.c (gdk_pixbuf_fill): a comment asked to optimize this

115
gdk-pixbuf/pixops/pixops.c
View File

@ -176,37 +176,39 @@ pixops_composite_nearest (guchar *dest_buf,
else else
a0 = overall_alpha; a0 = overall_alpha;
if (dest_has_alpha) switch (a0)
{ {
unsigned int w0 = 0xff * a0; case 0:
unsigned int w1 = (0xff - a0) * dest[3]; break;
unsigned int w = w0 + w1; case 255:
dest[0] = p[0];
dest[1] = p[1];
dest[2] = p[2];
if (dest_has_alpha)
dest[3] = 0xff;
break;
default:
if (dest_has_alpha)
{
unsigned int w0 = 0xff * a0;
unsigned int w1 = (0xff - a0) * dest[3];
unsigned int w = w0 + w1;
if (w != 0)
{
dest[0] = (w0 * p[0] + w1 * dest[0]) / w; dest[0] = (w0 * p[0] + w1 * dest[0]) / w;
dest[1] = (w0 * p[1] + w1 * dest[1]) / w; dest[1] = (w0 * p[1] + w1 * dest[1]) / w;
dest[2] = (w0 * p[2] + w1 * dest[2]) / w; dest[2] = (w0 * p[2] + w1 * dest[2]) / w;
dest[3] = w / 0xff; dest[3] = w / 0xff;
} }
else else
{ {
dest[0] = 0; unsigned int a1 = 0xff - a0;
dest[1] = 0;
dest[2] = 0; dest[0] = (a0 * p[0] + a1 * dest[0]) / 0xff;
dest[3] = 0; dest[1] = (a0 * p[1] + a1 * dest[1]) / 0xff;
} dest[2] = (a0 * p[2] + a1 * dest[2]) / 0xff;
} }
else break;
{ }
dest[0] = (a0 * p[0] + (0xff - a0) * dest[0]) / 0xff;
dest[1] = (a0 * p[1] + (0xff - a0) * dest[1]) / 0xff;
dest[2] = (a0 * p[2] + (0xff - a0) * dest[2]) / 0xff;
if (dest_channels == 4)
dest[3] = 0xff;
}
dest += dest_channels; dest += dest_channels;
x += x_step; x += x_step;
} }
@ -283,31 +285,48 @@ pixops_composite_color_nearest (guchar *dest_buf,
else else
a0 = overall_alpha; a0 = overall_alpha;
if (a0 == 255) switch (a0)
{ {
case 0:
if (((j + check_x) >> check_shift) & 1)
{
dest[0] = r2;
dest[1] = g2;
dest[2] = b2;
}
else
{
dest[0] = r1;
dest[1] = g1;
dest[2] = b1;
}
break;
case 255:
dest[0] = p[0]; dest[0] = p[0];
dest[1] = p[1]; dest[1] = p[1];
dest[2] = p[2]; dest[2] = p[2];
} break;
else default:
if (((j + check_x) >> check_shift) & 1) if (((j + check_x) >> check_shift) & 1)
{ {
tmp = ((int) p[0] - r2) * a0; tmp = ((int) p[0] - r2) * a0;
dest[0] = r2 + ((tmp + (tmp >> 8) + 0x80) >> 8); dest[0] = r2 + ((tmp + (tmp >> 8) + 0x80) >> 8);
tmp = ((int) p[1] - g2) * a0; tmp = ((int) p[1] - g2) * a0;
dest[1] = g2 + ((tmp + (tmp >> 8) + 0x80) >> 8); dest[1] = g2 + ((tmp + (tmp >> 8) + 0x80) >> 8);
tmp = ((int) p[2] - b2) * a0; tmp = ((int) p[2] - b2) * a0;
dest[2] = b2 + ((tmp + (tmp >> 8) + 0x80) >> 8); dest[2] = b2 + ((tmp + (tmp >> 8) + 0x80) >> 8);
} }
else else
{ {
tmp = ((int) p[0] - r1) * a0; tmp = ((int) p[0] - r1) * a0;
dest[0] = r1 + ((tmp + (tmp >> 8) + 0x80) >> 8); dest[0] = r1 + ((tmp + (tmp >> 8) + 0x80) >> 8);
tmp = ((int) p[1] - g1) * a0; tmp = ((int) p[1] - g1) * a0;
dest[1] = g1 + ((tmp + (tmp >> 8) + 0x80) >> 8); dest[1] = g1 + ((tmp + (tmp >> 8) + 0x80) >> 8);
tmp = ((int) p[2] - b1) * a0; tmp = ((int) p[2] - b1) * a0;
dest[2] = b1 + ((tmp + (tmp >> 8) + 0x80) >> 8); dest[2] = b1 + ((tmp + (tmp >> 8) + 0x80) >> 8);
} }
break;
}
if (dest_channels == 4) if (dest_channels == 4)
dest[3] = 0xff; dest[3] = 0xff;