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|
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995-2003 Spencer Kimball, Peter Mattis, and others
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <gegl.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/pixel-region.h"
#include "base/pixel-surround.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "paint-funcs/scale-region.h"
#include "gimp-transform-region.h"
#include "gimpchannel.h"
#include "gimpcontext.h"
#include "gimpimage.h"
#include "gimppickable.h"
#include "gimpprogress.h"
/* forward function prototypes */
static void gimp_transform_region_nearest (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
const guchar *bg_color,
GimpProgress *progress);
static void gimp_transform_region_linear (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
gint recursion_level,
const guchar *bg_color,
GimpProgress *progress);
static void gimp_transform_region_cubic (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
gint recursion_level,
const guchar *bg_color,
GimpProgress *progress);
static void gimp_transform_region_lanczos (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
gint recursion_level,
const guchar *bg_color,
GimpProgress *progress);
static inline void untransform_coords (const GimpMatrix3 *m,
const gint x,
const gint y,
gdouble *tu,
gdouble *tv,
gdouble *tw);
static inline void normalize_coords (const gint coords,
const gdouble *tu,
const gdouble *tv,
const gdouble *tw,
gdouble *u,
gdouble *v);
static inline gboolean supersample_dtest (const gdouble u0,
const gdouble v0,
const gdouble u1,
const gdouble v1,
const gdouble u2,
const gdouble v2,
const gdouble u3,
const gdouble v3);
static void sample_adapt (TileManager *tm,
const gdouble xc,
const gdouble yc,
const gdouble x0,
const gdouble y0,
const gdouble x1,
const gdouble y1,
const gdouble x2,
const gdouble y2,
const gdouble x3,
const gdouble y3,
const gint level,
guchar *color,
const guchar *bg_color,
gint bpp,
gint alpha);
static void sample_linear (PixelSurround *surround,
const gdouble u,
const gdouble v,
guchar *color,
const gint bytes,
const gint alpha);
static void sample_cubic (PixelSurround *surround,
const gdouble u,
const gdouble v,
guchar *color,
const gint bytes,
const gint alpha);
static void sample_lanczos (PixelSurround *surround,
const gfloat *lanczos,
const gdouble u,
const gdouble v,
guchar *color,
const gint bytes,
const gint alpha);
/* public functions */
void
gimp_transform_region (GimpPickable *pickable,
GimpContext *context,
TileManager *orig_tiles,
gint orig_offset_x,
gint orig_offset_y,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
const GimpMatrix3 *matrix,
GimpInterpolationType interpolation_type,
gint recursion_level,
GimpProgress *progress)
{
GimpImageType pickable_type;
GimpMatrix3 m;
gint u1, v1, u2, v2; /* source bounding box */
gint alpha;
guchar bg_color[MAX_CHANNELS];
g_return_if_fail (GIMP_IS_PICKABLE (pickable));
u1 = orig_offset_x;
v1 = orig_offset_y;
u2 = u1 + tile_manager_width (orig_tiles);
v2 = v1 + tile_manager_height (orig_tiles);
m = *matrix;
gimp_matrix3_invert (&m);
/* turn interpolation off for simple transformations (e.g. rot90) */
if (gimp_matrix3_is_simple (matrix))
interpolation_type = GIMP_INTERPOLATION_NONE;
pickable_type = gimp_pickable_get_image_type (pickable);
/* Get the background color */
gimp_image_get_background (gimp_pickable_get_image (pickable), context,
pickable_type, bg_color);
switch (GIMP_IMAGE_TYPE_BASE_TYPE (pickable_type))
{
case GIMP_RGB:
bg_color[ALPHA] = TRANSPARENT_OPACITY;
alpha = ALPHA;
break;
case GIMP_GRAY:
bg_color[ALPHA_G] = TRANSPARENT_OPACITY;
alpha = ALPHA_G;
break;
case GIMP_INDEXED:
bg_color[ALPHA_I] = TRANSPARENT_OPACITY;
alpha = ALPHA_I;
/* If the image is indexed color, ignore interpolation value */
interpolation_type = GIMP_INTERPOLATION_NONE;
break;
default:
g_assert_not_reached ();
break;
}
/* "Outside" a channel is transparency, not the bg color */
if (GIMP_IS_CHANNEL (pickable))
bg_color[0] = TRANSPARENT_OPACITY;
/* setting alpha = 0 will cause the channel's value to be treated
* as alpha and the color channel loops never to be entered
*/
if (tile_manager_bpp (orig_tiles) == 1)
alpha = 0;
switch (interpolation_type)
{
case GIMP_INTERPOLATION_NONE:
gimp_transform_region_nearest (orig_tiles, destPR,
dest_x1, dest_y1, dest_x2, dest_y2,
u1, v1, u2, v2,
&m, alpha, bg_color, progress);
break;
case GIMP_INTERPOLATION_LINEAR:
gimp_transform_region_linear (orig_tiles, destPR,
dest_x1, dest_y1, dest_x2, dest_y2,
u1, v1, u2, v2,
&m, alpha, recursion_level,
bg_color, progress);
break;
case GIMP_INTERPOLATION_CUBIC:
gimp_transform_region_cubic (orig_tiles, destPR,
dest_x1, dest_y1, dest_x2, dest_y2,
u1, v1, u2, v2,
&m, alpha, recursion_level,
bg_color, progress);
break;
case GIMP_INTERPOLATION_LANCZOS:
gimp_transform_region_lanczos (orig_tiles, destPR,
dest_x1, dest_y1, dest_x2, dest_y2,
u1, v1, u2, v2,
&m, alpha, recursion_level,
bg_color, progress);
break;
}
}
static void
gimp_transform_region_nearest (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
const guchar *bg_color,
GimpProgress *progress)
{
gdouble uinc, vinc, winc; /* increments in source coordinates */
gint pixels;
gint total;
gint n;
gpointer pr;
uinc = m->coeff[0][0];
vinc = m->coeff[1][0];
winc = m->coeff[2][0];
total = destPR->w * destPR->h;
for (pr = pixel_regions_register (1, destPR), pixels = 0, n = 0;
pr != NULL;
pr = pixel_regions_process (pr), n++)
{
guchar *dest = destPR->data;
gint y;
for (y = destPR->y; y < destPR->y + destPR->h; y++)
{
gint x = dest_x1 + destPR->x;
gint width = destPR->w;
guchar *d = dest;
gdouble tu, tv, tw; /* undivided source coordinates and divisor */
/* set up inverse transform steps */
tu = uinc * (x + .5) + m->coeff[0][1] * (dest_y1 + y + .5) + m->coeff[0][2];
tv = vinc * (x + .5) + m->coeff[1][1] * (dest_y1 + y + .5) + m->coeff[1][2];
tw = winc * (x + .5) + m->coeff[2][1] * (dest_y1 + y + .5) + m->coeff[2][2];
while (width--)
{
gdouble u, v; /* source coordinates */
gint iu, iv;
/* normalize homogeneous coords */
normalize_coords (1, &tu, &tv, &tw, &u, &v);
/* EPSILON here is useful to make floating point arithmetic
* rounding errors consistent when the exact computation
* results in a 'integer and a half'
*/
#define EPSILON 1.e-5
iu = floor (u + 0.5 + EPSILON);
iv = floor (v + 0.5 + EPSILON);
/* Set the destination pixels */
if (iu >= u1 && iu < u2 &&
iv >= v1 && iv < v2)
{
tile_manager_read_pixel_data_1 (orig_tiles, iu - u1, iv - v1,
d);
d += destPR->bytes;
}
else /* not in source range */
{
gint b;
for (b = 0; b < destPR->bytes; b++)
*d++ = bg_color[b];
}
tu += uinc;
tv += vinc;
tw += winc;
}
dest += destPR->rowstride;
}
if (progress)
{
pixels += destPR->w * destPR->h;
if (n % 16 == 0)
gimp_progress_set_value (progress,
(gdouble) pixels / (gdouble) total);
}
}
}
static void
gimp_transform_region_linear (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
gint recursion_level,
const guchar *bg_color,
GimpProgress *progress)
{
PixelSurround *surround;
gdouble uinc, vinc, winc; /* increments in source coordinates */
gint pixels;
gint total;
gint n;
gpointer pr;
surround = pixel_surround_new (orig_tiles, 2, 2, PIXEL_SURROUND_BACKGROUND);
pixel_surround_set_bg (surround, bg_color);
uinc = m->coeff[0][0];
vinc = m->coeff[1][0];
winc = m->coeff[2][0];
total = destPR->w * destPR->h;
for (pr = pixel_regions_register (1, destPR), pixels = 0, n = 0;
pr != NULL;
pr = pixel_regions_process (pr), n++)
{
guchar *dest = destPR->data;
gint y;
for (y = destPR->y; y < destPR->y + destPR->h; y++)
{
guchar *d = dest;
gint width = destPR->w;
gdouble tu[5], tv[5]; /* undivided source coordinates */
gdouble tw[5]; /* divisor */
/* set up inverse transform steps */
untransform_coords (m, dest_x1 + destPR->x, dest_y1 + y, tu, tv, tw);
while (width--)
{
gdouble u[5], v[5]; /* source coordinates */
gint i;
/* normalize homogeneous coords */
normalize_coords (5, tu, tv, tw, u, v);
/* Set the destination pixels */
if (supersample_dtest (u[1], v[1], u[2], v[2],
u[3], v[3], u[4], v[4]))
{
sample_adapt (orig_tiles,
u[0] - u1, v[0] - v1,
u[1] - u1, v[1] - v1,
u[2] - u1, v[2] - v1,
u[3] - u1, v[3] - v1,
u[4] - u1, v[4] - v1,
recursion_level,
d, bg_color, destPR->bytes, alpha);
}
else
{
sample_linear (surround, u[0] - u1, v[0] - v1,
d, destPR->bytes, alpha);
}
d += destPR->bytes;
for (i = 0; i < 5; i++)
{
tu[i] += uinc;
tv[i] += vinc;
tw[i] += winc;
}
}
dest += destPR->rowstride;
}
if (progress)
{
pixels += destPR->w * destPR->h;
if (n % 16 == 0)
gimp_progress_set_value (progress,
(gdouble) pixels / (gdouble) total);
}
}
pixel_surround_destroy (surround);
}
static void
gimp_transform_region_cubic (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
gint recursion_level,
const guchar *bg_color,
GimpProgress *progress)
{
PixelSurround *surround;
gdouble uinc, vinc, winc; /* increments in source coordinates */
gint pixels;
gint total;
gint n;
gpointer pr;
surround = pixel_surround_new (orig_tiles, 4, 4, PIXEL_SURROUND_BACKGROUND);
pixel_surround_set_bg (surround, bg_color);
uinc = m->coeff[0][0];
vinc = m->coeff[1][0];
winc = m->coeff[2][0];
total = destPR->w * destPR->h;
for (pr = pixel_regions_register (1, destPR), pixels = 0, n = 0;
pr != NULL;
pr = pixel_regions_process (pr), n++)
{
guchar *dest = destPR->data;
gint y;
for (y = destPR->y; y < destPR->y + destPR->h; y++)
{
guchar *d = dest;
gint width = destPR->w;
gdouble tu[5], tv[5]; /* undivided source coordinates */
gdouble tw[5]; /* divisor */
/* set up inverse transform steps */
untransform_coords (m, dest_x1 + destPR->x, dest_y1 + y, tu, tv, tw);
while (width--)
{
gdouble u[5], v[5]; /* source coordinates */
gint i;
/* normalize homogeneous coords */
normalize_coords (5, tu, tv, tw, u, v);
if (supersample_dtest (u[1], v[1], u[2], v[2],
u[3], v[3], u[4], v[4]))
{
sample_adapt (orig_tiles,
u[0] - u1, v[0] - v1,
u[1] - u1, v[1] - v1,
u[2] - u1, v[2] - v1,
u[3] - u1, v[3] - v1,
u[4] - u1, v[4] - v1,
recursion_level,
d, bg_color, destPR->bytes, alpha);
}
else
{
sample_cubic (surround, u[0] - u1, v[0] - v1,
d, destPR->bytes, alpha);
}
d += destPR->bytes;
for (i = 0; i < 5; i++)
{
tu[i] += uinc;
tv[i] += vinc;
tw[i] += winc;
}
}
dest += destPR->rowstride;
}
if (progress)
{
pixels += destPR->w * destPR->h;
if (n % 16 == 0)
gimp_progress_set_value (progress,
(gdouble) pixels / (gdouble) total);
}
}
pixel_surround_destroy (surround);
}
static void
gimp_transform_region_lanczos (TileManager *orig_tiles,
PixelRegion *destPR,
gint dest_x1,
gint dest_y1,
gint dest_x2,
gint dest_y2,
gint u1,
gint v1,
gint u2,
gint v2,
const GimpMatrix3 *m,
gint alpha,
gint recursion_level,
const guchar *bg_color,
GimpProgress *progress)
{
PixelSurround *surround;
gfloat *lanczos; /* Lanczos lookup table */
gdouble uinc, vinc, winc; /* increments in source coordinates */
gint pixels;
gint total;
gint n;
gpointer pr;
surround = pixel_surround_new (orig_tiles,
LANCZOS_WIDTH2, LANCZOS_WIDTH2,
PIXEL_SURROUND_BACKGROUND);
pixel_surround_set_bg (surround, bg_color);
/* allocate and fill lanczos lookup table */
lanczos = create_lanczos_lookup ();
uinc = m->coeff[0][0];
vinc = m->coeff[1][0];
winc = m->coeff[2][0];
total = destPR->w * destPR->h;
for (pr = pixel_regions_register (1, destPR), pixels = 0, n = 0;
pr != NULL;
pr = pixel_regions_process (pr), n++)
{
guchar *dest = destPR->data;
gint y;
for (y = destPR->y; y < destPR->y + destPR->h; y++)
{
guchar *d = dest;
gint width = destPR->w;
gdouble tu[5], tv[5]; /* undivided source coordinates */
gdouble tw[5]; /* divisor */
/* set up inverse transform steps */
untransform_coords (m, dest_x1 + destPR->x, dest_y1 + y, tu, tv, tw);
while (width--)
{
gdouble u[5], v[5]; /* source coordinates */
gint i;
/* normalize homogeneous coords */
normalize_coords (5, tu, tv, tw, u, v);
if (supersample_dtest (u[1], v[1], u[2], v[2],
u[3], v[3], u[4], v[4]))
{
sample_adapt (orig_tiles,
u[0] - u1, v[0] - v1,
u[1] - u1, v[1] - v1,
u[2] - u1, v[2] - v1,
u[3] - u1, v[3] - v1,
u[4] - u1, v[4] - v1,
recursion_level,
d, bg_color, destPR->bytes, alpha);
}
else
{
sample_lanczos (surround, lanczos, u[0] - u1, v[0] - v1,
d, destPR->bytes, alpha);
}
d += destPR->bytes;
for (i = 0; i < 5; i++)
{
tu[i] += uinc;
tv[i] += vinc;
tw[i] += winc;
}
}
dest += destPR->rowstride;
}
if (progress)
{
pixels += destPR->w * destPR->h;
if (n % 16 == 0)
gimp_progress_set_value (progress,
(gdouble) pixels / (gdouble) total);
}
}
g_free (lanczos);
pixel_surround_destroy (surround);
}
/* private functions */
static inline void
untransform_coords (const GimpMatrix3 *m,
const gint ix,
const gint iy,
gdouble *tu,
gdouble *tv,
gdouble *tw)
{
gdouble x = ix + .5;
gdouble y = iy + .5;
tu[0] = m->coeff[0][0] * (x ) + m->coeff[0][1] * (y ) + m->coeff[0][2];
tv[0] = m->coeff[1][0] * (x ) + m->coeff[1][1] * (y ) + m->coeff[1][2];
tw[0] = m->coeff[2][0] * (x ) + m->coeff[2][1] * (y ) + m->coeff[2][2];
tu[1] = m->coeff[0][0] * (x - 1) + m->coeff[0][1] * (y ) + m->coeff[0][2];
tv[1] = m->coeff[1][0] * (x - 1) + m->coeff[1][1] * (y ) + m->coeff[1][2];
tw[1] = m->coeff[2][0] * (x - 1) + m->coeff[2][1] * (y ) + m->coeff[2][2];
tu[2] = m->coeff[0][0] * (x ) + m->coeff[0][1] * (y - 1) + m->coeff[0][2];
tv[2] = m->coeff[1][0] * (x ) + m->coeff[1][1] * (y - 1) + m->coeff[1][2];
tw[2] = m->coeff[2][0] * (x ) + m->coeff[2][1] * (y - 1) + m->coeff[2][2];
tu[3] = m->coeff[0][0] * (x + 1) + m->coeff[0][1] * (y ) + m->coeff[0][2];
tv[3] = m->coeff[1][0] * (x + 1) + m->coeff[1][1] * (y ) + m->coeff[1][2];
tw[3] = m->coeff[2][0] * (x + 1) + m->coeff[2][1] * (y ) + m->coeff[2][2];
tu[4] = m->coeff[0][0] * (x ) + m->coeff[0][1] * (y + 1) + m->coeff[0][2];
tv[4] = m->coeff[1][0] * (x ) + m->coeff[1][1] * (y + 1) + m->coeff[1][2];
tw[4] = m->coeff[2][0] * (x ) + m->coeff[2][1] * (y + 1) + m->coeff[2][2];
}
static inline void
normalize_coords (const gint coords,
const gdouble *tu,
const gdouble *tv,
const gdouble *tw,
gdouble *u,
gdouble *v)
{
gint i;
for (i = 0; i < coords; i++)
{
if (G_LIKELY (tw[i] != 0.0))
{
u[i] = tu[i] / tw[i] - .5;
v[i] = tv[i] / tw[i] - .5;
}
else
{
g_warning ("homogeneous coordinate = 0...\n");
u[i] = tu[i];
v[i] = tv[i];
}
}
}
#define BILINEAR(jk, j1k, jk1, j1k1, dx, dy) \
((1 - dy) * (jk + dx * (j1k - jk)) + \
dy * (jk1 + dx * (j1k1 - jk1)))
/* u & v are the subpixel coordinates of the point in
* the original selection's floating buffer.
* We need the two pixel coords around them:
* iu to iu + 1, iv to iv + 1
*/
static void
sample_linear (PixelSurround *surround,
const gdouble u,
const gdouble v,
guchar *color,
const gint bytes,
const gint alpha)
{
gdouble a_val, a_recip;
gint i;
const gint iu = floor (u);
const gint iv = floor (v);
gint rowstride;
gdouble du, dv;
const guchar *alphachan;
const guchar *data;
/* lock the pixel surround */
data = pixel_surround_lock (surround, iu, iv, &rowstride);
/* the fractional error */
du = u - iu;
dv = v - iv;
/* calculate alpha value of result pixel */
alphachan = &data[alpha];
a_val = BILINEAR (alphachan[0], alphachan[bytes],
alphachan[rowstride], alphachan[rowstride + bytes], du, dv);
if (a_val <= 0.0)
{
a_recip = 0.0;
color[alpha] = 0.0;
}
else if (a_val >= 255.0)
{
a_recip = 1.0 / a_val;
color[alpha] = 255;
}
else
{
a_recip = 1.0 / a_val;
color[alpha] = RINT (a_val);
}
/* for colour channels c,
* result = bilinear (c * alpha) / bilinear (alpha)
*
* never entered for alpha == 0
*/
for (i = 0; i < alpha; i++)
{
gint newval =
ROUND ((a_recip *
BILINEAR (alphachan[0] * data[i],
alphachan[bytes] * data[bytes + i],
alphachan[rowstride] * data[rowstride + i],
alphachan[rowstride + bytes] * data[rowstride + bytes + i],
du, dv)));
color[i] = CLAMP (newval, 0, 255);
}
}
/* macros to handle conversion to/from fixed point, this fixed point code
* uses signed integers, by using 8 bits for the fractional part we have
*
* 1 bit sign
* 21 bits integer part
* 8 bit fractional part
*
* 1023 discrete subpixel sample positions should be enough for the needs
* of the supersampling algorithm, drawables where the dimensions have a need
* exceeding 2^21 ( 2097152px, will typically use terabytes of memory, when
* that is the common need, we can probably assume 64 bit integers and adjust
* FIXED_SHIFT accordingly.
*/
#define FIXED_SHIFT 10
#define FIXED_UNIT (1 << FIXED_SHIFT)
#define DOUBLE2FIXED(val) ((val) * FIXED_UNIT)
#define FIXED2DOUBLE(val) ((val) / FIXED_UNIT)
/*
bilinear interpolation of a fixed point pixel
*/
static void
sample_bi (TileManager *tm,
const gint x,
const gint y,
guchar *color,
const guchar *bg_color,
const gint bpp,
const gint alpha)
{
const gint xscale = (x & (FIXED_UNIT-1));
const gint yscale = (y & (FIXED_UNIT-1));
const gint x0 = x >> FIXED_SHIFT;
const gint y0 = y >> FIXED_SHIFT;
const gint x1 = x0 + 1;
const gint y1 = y0 + 1;
guchar C[4][4];
gint i;
/* fill the color with default values, since
* tile_manager_read_pixel_data_1 does nothing, when accesses are
* out of bounds.
*/
for (i = 0; i < 4; i++)
{
guint *src = (guint *) bg_color;
guint *dst = (guint *) &C[i];
*dst = *src;
}
tile_manager_read_pixel_data_1 (tm, x0, y0, C[0]);
tile_manager_read_pixel_data_1 (tm, x1, y0, C[2]);
tile_manager_read_pixel_data_1 (tm, x0, y1, C[1]);
tile_manager_read_pixel_data_1 (tm, x1, y1, C[3]);
#define lerp(v1, v2, r) \
(((guint)(v1) * (FIXED_UNIT - (guint)(r)) + \
(guint)(v2) * (guint)(r)) >> FIXED_SHIFT)
color[alpha]= lerp (lerp (C[0][alpha], C[1][alpha], yscale),
lerp (C[2][alpha], C[3][alpha], yscale), xscale);
if (color[alpha])
{
/* to avoid problems, calculate with premultiplied alpha */
for (i = 0; i < alpha; i++)
color[i] = lerp (lerp (C[0][i] * C[0][alpha] / 255,
C[1][i] * C[1][alpha] / 255, yscale),
lerp (C[2][i] * C[2][alpha] / 255,
C[3][i] * C[3][alpha] / 255, yscale), xscale);
}
else
{
for (i = 0; i < alpha; i++)
color[i] = 0;
}
#undef lerp
}
/*
* Returns TRUE if one of the deltas of the quad edge is > 1.0 (16.16 fixed
* values). This is the condition used on whether additional recursive
* subdivision should be used.
*/
static inline gboolean
supersample_test (const gint x0, const gint y0,
const gint x1, const gint y1,
const gint x2, const gint y2,
const gint x3, const gint y3)
{
return (abs (x0 - x1) > FIXED_UNIT ||
abs (x1 - x2) > FIXED_UNIT ||
abs (x2 - x3) > FIXED_UNIT ||
abs (x3 - x0) > FIXED_UNIT ||
abs (y0 - y1) > FIXED_UNIT ||
abs (y1 - y2) > FIXED_UNIT ||
abs (y2 - y3) > FIXED_UNIT ||
abs (y3 - y0) > FIXED_UNIT);
}
/*
* Returns TRUE if one of the deltas of the quad edge is > sqrt(2) (double
* values). This is the condition used on whether supersampling should be used
* or not. By making this sqrt(2) supersampling will not be triggered by
* rotations.
*/
static inline gboolean
supersample_dtest (const gdouble x0, const gdouble y0,
const gdouble x1, const gdouble y1,
const gdouble x2, const gdouble y2,
const gdouble x3, const gdouble y3)
{
return (fabs (x0 - x1) > G_SQRT2 ||
fabs (x1 - x2) > G_SQRT2 ||
fabs (x2 - x3) > G_SQRT2 ||
fabs (x3 - x0) > G_SQRT2 ||
fabs (y0 - y1) > G_SQRT2 ||
fabs (y1 - y2) > G_SQRT2 ||
fabs (y2 - y3) > G_SQRT2 ||
fabs (y3 - y0) > G_SQRT2);
}
/*
sample a grid that is spaced according to the quadraliteral's edges,
it subdivides a maximum of level times before sampling.
0..3 is a cycle around the quad
*/
static void
get_sample (TileManager *tm,
const gint xc,
const gint yc,
const gint x0,
const gint y0,
const gint x1,
const gint y1,
const gint x2,
const gint y2,
const gint x3,
const gint y3,
gint *cc,
const gint level,
guint *color,
const guchar *bg_color,
const gint bpp,
const gint alpha)
{
if (!level || !supersample_test (x0, y0, x1, y1, x2, y2, x3, y3))
{
gint i;
guchar C[4];
sample_bi (tm, xc, yc, C, bg_color, bpp, alpha);
for (i = 0; i < bpp; i++)
color[i]+= C[i];
(*cc)++; /* increase number of samples taken */
}
else
{
gint tx, lx, rx, bx, tlx, trx, blx, brx;
gint ty, ly, ry, by, tly, try, bly, bry;
/* calculate subdivided corner coordinates (including centercoords
thus using a bilinear interpolation,. almost as good as
doing the perspective transform for each subpixel coordinate*/
tx = (x0 + x1) / 2;
tlx = (x0 + xc) / 2;
trx = (x1 + xc) / 2;
lx = (x0 + x3) / 2;
rx = (x1 + x2) / 2;
blx = (x3 + xc) / 2;
brx = (x2 + xc) / 2;
bx = (x3 + x2) / 2;
ty = (y0 + y1) / 2;
tly = (y0 + yc) / 2;
try = (y1 + yc) / 2;
ly = (y0 + y3) / 2;
ry = (y1 + y2) / 2;
bly = (y3 + yc) / 2;
bry = (y2 + yc) / 2;
by = (y3 + y2) / 2;
get_sample (tm,
tlx,tly,
x0,y0, tx,ty, xc,yc, lx,ly,
cc, level-1, color, bg_color, bpp, alpha);
get_sample (tm,
trx,try,
tx,ty, x1,y1, rx,ry, xc,yc,
cc, level-1, color, bg_color, bpp, alpha);
get_sample (tm,
brx,bry,
xc,yc, rx,ry, x2,y2, bx,by,
cc, level-1, color, bg_color, bpp, alpha);
get_sample (tm,
blx,bly,
lx,ly, xc,yc, bx,by, x3,y3,
cc, level-1, color, bg_color, bpp, alpha);
}
}
static void
sample_adapt (TileManager *tm,
const gdouble xc,
const gdouble yc,
const gdouble x0,
const gdouble y0,
const gdouble x1,
const gdouble y1,
const gdouble x2,
const gdouble y2,
const gdouble x3,
const gdouble y3,
const gint level,
guchar *color,
const guchar *bg_color,
const gint bpp,
const gint alpha)
{
gint cc = 0;
gint i;
guint C[MAX_CHANNELS];
C[0] = C[1] = C[2] = C[3] = 0;
get_sample (tm,
DOUBLE2FIXED (xc), DOUBLE2FIXED (yc),
DOUBLE2FIXED (x0), DOUBLE2FIXED (y0),
DOUBLE2FIXED (x1), DOUBLE2FIXED (y1),
DOUBLE2FIXED (x2), DOUBLE2FIXED (y2),
DOUBLE2FIXED (x3), DOUBLE2FIXED (y3),
&cc, level, C, bg_color, bpp, alpha);
if (!cc)
cc=1;
color[alpha] = C[alpha] / cc;
if (color[alpha])
{
/* go from premultiplied to postmultiplied alpha */
for (i = 0; i < alpha; i++)
color[i] = ((C[i] / cc) * 255) / color[alpha];
}
else
{
for (i = 0; i < alpha; i++)
color[i] = 0;
}
}
/* access interleaved pixels */
#define CUBIC_ROW(dx, row, step) \
gimp_drawable_transform_cubic(dx,\
(row)[0], (row)[step], (row)[step+step], (row)[step+step+step])
#define CUBIC_SCALED_ROW(dx, row, arow, step) \
gimp_drawable_transform_cubic(dx, \
(arow)[0] * (row)[0], \
(arow)[step] * (row)[step], \
(arow)[step+step] * (row)[step+step], \
(arow)[step+step+step] * (row)[step+step+step])
/* Note: cubic function no longer clips result. */
/* Inlining this function makes sample_cubic() run about 10% faster. (Sven) */
static inline gdouble
gimp_drawable_transform_cubic (const gdouble dx,
const gint jm1,
const gint j,
const gint jp1,
const gint jp2)
{
gdouble result;
#if 0
/* Equivalent to Gimp 1.1.1 and earlier - some ringing */
result = ((( ( - jm1 + j - jp1 + jp2 ) * dx +
( jm1 + jm1 - j - j + jp1 - jp2 ) ) * dx +
( - jm1 + jp1 ) ) * dx + j );
/* Recommended by Mitchell and Netravali - too blurred? */
result = ((( ( - 7 * jm1 + 21 * j - 21 * jp1 + 7 * jp2 ) * dx +
( 15 * jm1 - 36 * j + 27 * jp1 - 6 * jp2 ) ) * dx +
( - 9 * jm1 + 9 * jp1 ) ) * dx + (jm1 + 16 * j + jp1) ) / 18.0;
#endif
/* Catmull-Rom - not bad */
result = ((( ( - jm1 + 3 * j - 3 * jp1 + jp2 ) * dx +
( 2 * jm1 - 5 * j + 4 * jp1 - jp2 ) ) * dx +
( - jm1 + jp1 ) ) * dx + (j + j) ) / 2.0;
return result;
}
/* u & v are the subpixel coordinates of the point in
* the original selection's floating buffer.
* We need the four integer pixel coords around them:
* iu to iu + 3, iv to iv + 3
*/
static void
sample_cubic (PixelSurround *surround,
const gdouble u,
const gdouble v,
guchar *color,
const gint bytes,
const gint alpha)
{
gdouble a_val, a_recip;
gint i;
const gint iu = floor(u);
const gint iv = floor(v);
gint rowstride;
gdouble du, dv;
const guchar *data;
/* lock the pixel surround */
data = pixel_surround_lock (surround, iu - 1 , iv - 1, &rowstride);
/* the fractional error */
du = u - iu;
dv = v - iv;
/* calculate alpha of result */
a_val = gimp_drawable_transform_cubic
(dv,
CUBIC_ROW (du, data + alpha + rowstride * 0, bytes),
CUBIC_ROW (du, data + alpha + rowstride * 1, bytes),
CUBIC_ROW (du, data + alpha + rowstride * 2, bytes),
CUBIC_ROW (du, data + alpha + rowstride * 3, bytes));
if (a_val <= 0.0)
{
a_recip = 0.0;
color[alpha] = 0;
}
else if (a_val > 255.0)
{
a_recip = 1.0 / a_val;
color[alpha] = 255;
}
else
{
a_recip = 1.0 / a_val;
color[alpha] = RINT (a_val);
}
/* for colour channels c,
* result = bicubic (c * alpha) / bicubic (alpha)
*
* never entered for alpha == 0
*/
for (i = 0; i < alpha; i++)
{
gint newval =
ROUND ((a_recip *
gimp_drawable_transform_cubic
(dv,
CUBIC_SCALED_ROW (du,
i + data + rowstride * 0,
data + alpha + rowstride * 0,
bytes),
CUBIC_SCALED_ROW (du,
i + data + rowstride * 1,
data + alpha + rowstride * 1,
bytes),
CUBIC_SCALED_ROW (du,
i + data + rowstride * 2,
data + alpha + rowstride * 2,
bytes),
CUBIC_SCALED_ROW (du,
i + data + rowstride * 3,
data + alpha + rowstride * 3,
bytes))));
color[i] = CLAMP (newval, 0, 255);
}
}
static void
sample_lanczos (PixelSurround *surround,
const gfloat *lanczos,
const gdouble u,
const gdouble v,
guchar *color,
const gint bytes,
const gint alpha)
{
gdouble x_kernel[LANCZOS_WIDTH2]; /* 1-D kernels of window coeffs */
gdouble y_kernel[LANCZOS_WIDTH2];
gdouble x_sum, y_sum; /* sum of Lanczos weights */
gdouble arecip;
gdouble aval;
gint su, sv;
gint b;
gint i, j;
gint iu, iv;
gint rowstride;
const guchar *data;
const guchar *src;
iu = (gint) u;
iv = (gint) v;
/* get weight for fractional error */
su = (gint) ((u - iu) * LANCZOS_SPP);
sv = (gint) ((v - iv) * LANCZOS_SPP);
/* fill 1D kernels */
for (x_sum = y_sum = 0.0, i = LANCZOS_WIDTH; i >= -LANCZOS_WIDTH; i--)
{
gint pos = i * LANCZOS_SPP;
x_sum += x_kernel[LANCZOS_WIDTH + i] = lanczos[ABS (su - pos)];
y_sum += y_kernel[LANCZOS_WIDTH + i] = lanczos[ABS (sv - pos)];
}
/* normalise the weighted arrays */
for (i = 0; i < LANCZOS_WIDTH2 ; i++)
{
x_kernel[i] /= x_sum;
y_kernel[i] /= y_sum;
}
/* lock the pixel surround */
data = pixel_surround_lock (surround,
iu - LANCZOS_WIDTH, iv - LANCZOS_WIDTH,
&rowstride);
src = data + alpha;
aval = 0.0;
for (j = 0; j < LANCZOS_WIDTH2 ; j++)
{
for (i = 0; i < LANCZOS_WIDTH2 ; i++)
aval += y_kernel[j] * x_kernel[i] * (gdouble) src[i * bytes];
src += rowstride;
}
if (aval <= 0.0)
{
arecip = 0.0;
aval = 0;
}
else if (aval > 255.0)
{
arecip = 1.0 / aval;
aval = 255;
}
else
{
arecip = 1.0 / aval;
}
for (b = 0; b < alpha; b++)
{
const guchar *asrc;
gdouble newval = 0.0;
src = data + b;
asrc = data + alpha;
for (j = 0; j < LANCZOS_WIDTH2; j++)
{
for (i = 0; i < LANCZOS_WIDTH2; i++)
newval += (y_kernel[j] * x_kernel[i] *
(gdouble) src[i * bytes] * (gdouble) asrc[i * bytes]);
src += rowstride;
asrc += rowstride;
}
newval *= arecip;
color[b] = CLAMP (ROUND (newval), 0, 255);
}
color[alpha] = RINT (aval);
}
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