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further simplified the code path that is executed when a brush is scaled

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2008-08-26  Sven Neumann  <sven@gimp.org>

	* app/paint-funcs/scale-region.c: further simplified the code 
path
	that is executed when a brush is scaled up. We don't need to 
scale
	in several steps here.


svn path=/trunk/; revision=26780
This commit is contained in:
Sven Neumann
2008-08-26 19:52:35 +00:00
committed by Sven Neumann
parent 8499f5e247
commit ad4eb2f528
2 changed files with 11 additions and 179 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2008-08-26 Sven Neumann <sven@gimp.org>
* app/paint-funcs/scale-region.c: further simplified the code path
that is executed when a brush is scaled up. We don't need to scale
in several steps here.
2008-08-26 Sven Neumann <sven@gimp.org>
* app/paint-funcs/scale-region.c: removed some unused parameters

176
app/paint-funcs/scale-region.c
View File

@ -62,9 +62,6 @@ static void scale (TileManager *srcTM,
gpointer progress_data,
gint *progress,
gint max_progress);
static void scale_pr (PixelRegion *srcPR,
PixelRegion *dstPR);
static void interpolate_nearest (TileManager *srcTM,
const gint x0,
const gint y0,
@ -104,12 +101,6 @@ static void interpolate_lanczos3 (PixelSurround *surround,
const gint bytes,
guchar *pixel,
const gfloat *kernel_lookup);
static void decimate_average_pr (PixelRegion *srcPR,
const gint x0,
const gint y0,
const gint x1,
const gint y1,
guchar *pixel);
static void interpolate_bilinear_pr (PixelRegion *srcPR,
const gint x0,
const gint y0,
@ -320,143 +311,6 @@ scale_determine_progress (PixelRegion *srcPR,
return tiles;
}
static void
scale_region_buffer (PixelRegion *srcPR,
PixelRegion *dstPR)
{
PixelRegion tmpPR0;
PixelRegion tmpPR1;
const gint bytes = srcPR->bytes;
gint width = srcPR->w;
gint height = srcPR->h;
gint levelx = 0;
gint levely = 0;
/* determine scaling levels */
scale_determine_levels (srcPR, dstPR, &levelx, &levely);
pixel_region_init_data (&tmpPR0,
g_memdup (srcPR->data, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
while (levelx < 0 && levely < 0)
{
width <<= 1;
height <<= 1;
pixel_region_init_data (&tmpPR1,
g_new (guchar, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
scale_pr (&tmpPR0, &tmpPR1);
g_free (tmpPR0.data);
pixel_region_init_data (&tmpPR0,
tmpPR1.data,
bytes, width * bytes, 0, 0, width, height);
levelx++;
levely++;
}
while (levelx < 0)
{
width <<= 1;
pixel_region_init_data (&tmpPR1,
g_new (guchar, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
scale_pr (&tmpPR0, &tmpPR1);
g_free (tmpPR0.data);
pixel_region_init_data (&tmpPR0,
tmpPR1.data,
bytes, width * bytes, 0, 0, width, height);
levelx++;
}
while (levely < 0)
{
height <<= 1;
pixel_region_init_data (&tmpPR1,
g_new (guchar, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
scale_pr (&tmpPR0, &tmpPR1);
g_free (tmpPR0.data);
pixel_region_init_data (&tmpPR0,
tmpPR1.data,
bytes, width * bytes, 0, 0, width, height);
levely++;
}
while (levelx > 0 && levely > 0)
{
width >>= 1;
height >>= 1;
pixel_region_init_data (&tmpPR1,
g_new (guchar, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
scale_pr (&tmpPR0, &tmpPR1);
g_free (tmpPR0.data);
pixel_region_init_data (&tmpPR0,
tmpPR1.data,
bytes, width * bytes, 0, 0, width, height);
levelx--;
levely--;
}
while (levelx > 0)
{
width <<= 1;
pixel_region_init_data (&tmpPR1,
g_new (guchar, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
scale_pr (&tmpPR0, &tmpPR1);
g_free (tmpPR0.data);
pixel_region_init_data (&tmpPR0,
tmpPR1.data,
bytes, width * bytes, 0, 0, width, height);
levelx--;
}
while (levely > 0)
{
height <<= 1;
pixel_region_init_data (&tmpPR1,
g_new (guchar, width * height * bytes),
bytes, width * bytes, 0, 0, width, height);
scale_pr (&tmpPR0, &tmpPR1);
g_free (tmpPR0.data);
pixel_region_init_data (&tmpPR0,
tmpPR1.data,
bytes, width * bytes, 0, 0, width, height);
levely--;
}
scale_pr (&tmpPR0, dstPR);
g_free (tmpPR0.data);
return;
}
static void
scale_region_tile (PixelRegion *srcPR,
PixelRegion *dstPR,
@ -1528,7 +1382,7 @@ interpolate_lanczos3 (PixelSurround *surround,
}
static void
scale_pr (PixelRegion *srcPR,
scale_region_buffer (PixelRegion *srcPR,
PixelRegion *dstPR)
{
const gdouble scalex = (gdouble) dstPR->w / (gdouble) srcPR->w;
@ -1538,8 +1392,6 @@ scale_pr (PixelRegion *srcPR,
const gint bytes = srcPR->bytes;
const gint dst_width = dstPR->w;
const gint dst_height = dstPR->h;
const gboolean decimate = (src_width == 2 * dst_width ||
src_height == 2 * dst_height);
guchar *pixel = dstPR->data;
gint x, y;
@ -1561,40 +1413,14 @@ scale_pr (PixelRegion *srcPR,
sx1 = (sx1 < src_width - 1) ? sx1 : src_width - 1;
xfrac = xfrac - sx0;
if (decimate)
{
decimate_average_pr (srcPR, sx0, sy0, sx1, sy1, pixel);
}
else
{
interpolate_bilinear_pr (srcPR,
sx0, sy0, sx1, sy1, xfrac, yfrac,
pixel);
}
pixel += bytes;
}
}
}
static void
decimate_average_pr (PixelRegion *srcPR,
const gint x0,
const gint y0,
const gint x1,
const gint y1,
guchar *pixel)
{
const gint bytes = srcPR->bytes;
const gint width = srcPR->w;
guchar *p1 = srcPR->data + (y0 * width + x0) * bytes;
guchar *p2 = srcPR->data + (y0 * width + x1) * bytes;
guchar *p3 = srcPR->data + (y1 * width + x0) * bytes;
guchar *p4 = srcPR->data + (y1 * width + x1) * bytes;
pixel_average (p1, p2, p3, p4, pixel, bytes);
}
static void
interpolate_bilinear_pr (PixelRegion *srcPR,
const gint x0,