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gimp/app/paint-funcs/paint-funcs.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "paint-funcs-types.h"
#include "base/pixel-processor.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "composite/gimp-composite.h"
#include "paint-funcs.h"
#include "paint-funcs-generic.h"
#define RANDOM_SEED 314159265
#define EPSILON 0.0001
typedef enum
{
MinifyX_MinifyY,
MinifyX_MagnifyY,
MagnifyX_MinifyY,
MagnifyX_MagnifyY
} ScaleType;
/* Layer modes information */
typedef struct _LayerMode LayerMode;
struct _LayerMode
{
guchar affect_alpha : 1; /* does the layer mode affect the alpha channel */
guchar increase_opacity : 1; /* layer mode can increase opacity */
guchar decrease_opacity : 1; /* layer mode can decrease opacity */
};
static const LayerMode layer_modes[] =
/* This must obviously be in the same
* order as the corresponding values
* in the GimpLayerModeEffects enumeration.
*/
{
{ TRUE, TRUE, FALSE, }, /* GIMP_NORMAL_MODE */
{ TRUE, TRUE, FALSE, }, /* GIMP_DISSOLVE_MODE */
{ TRUE, TRUE, FALSE, }, /* GIMP_BEHIND_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_MULTIPLY_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_SCREEN_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_OVERLAY_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_DIFFERENCE_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_ADDITION_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_SUBTRACT_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_DARKEN_ONLY_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_LIGHTEN_ONLY_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_HUE_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_SATURATION_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_COLOR_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_VALUE_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_DIVIDE_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_DODGE_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_BURN_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_HARDLIGHT_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_SOFTLIGHT_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_GRAIN_EXTRACT_MODE */
{ FALSE, FALSE, FALSE, }, /* GIMP_GRAIN_MERGE_MODE */
{ TRUE, FALSE, TRUE, }, /* GIMP_COLOR_ERASE_MODE */
{ TRUE, FALSE, TRUE, }, /* GIMP_ERASE_MODE */
{ TRUE, TRUE, TRUE, }, /* GIMP_REPLACE_MODE */
{ TRUE, TRUE, FALSE, } /* GIMP_ANTI_ERASE_MODE */
};
typedef void (* LayerModeFunc) (struct apply_layer_mode_struct *);
static LayerModeFunc layer_mode_funcs[] =
{
layer_normal_mode,
layer_dissolve_mode,
layer_behind_mode,
layer_multiply_mode,
layer_screen_mode,
layer_overlay_mode,
layer_difference_mode,
layer_addition_mode,
layer_subtract_mode,
layer_darken_only_mode,
layer_lighten_only_mode,
layer_hue_mode,
layer_saturation_mode,
layer_color_mode,
layer_value_mode,
layer_divide_mode,
layer_dodge_mode,
layer_burn_mode,
layer_hardlight_mode,
layer_softlight_mode,
layer_grain_extract_mode,
layer_grain_merge_mode,
layer_color_erase_mode,
layer_erase_mode,
layer_replace_mode,
layer_anti_erase_mode
};
static const guchar no_mask = OPAQUE_OPACITY;
/* Local function prototypes */
static gint * make_curve (gdouble sigma,
guint *length);
static gdouble cubic (gdouble dx,
gint jm1,
gint j,
gint jp1,
gint jp2);
static void apply_layer_mode_replace (guchar *src1,
guchar *src2,
guchar *dest,
guchar *mask,
gint x,
gint y,
guint opacity,
guint length,
guint bytes1,
guint bytes2,
gboolean *affect);
static inline void rotate_pointers (guchar **p,
guint32 n);
static void
update_tile_rowhints (Tile *tile,
gint ymin,
gint ymax)
{
gint bpp, ewidth;
gint x, y;
guchar *ptr;
guchar alpha;
TileRowHint thishint;
#ifdef HINTS_SANITY
g_assert (tile != NULL);
#endif
tile_sanitize_rowhints (tile);
bpp = tile_bpp (tile);
ewidth = tile_ewidth (tile);
if (bpp == 1 || bpp == 3)
{
for (y = ymin; y <= ymax; y++)
tile_set_rowhint (tile, y, TILEROWHINT_OPAQUE);
return;
}
if (bpp == 4)
{
#ifdef HINTS_SANITY
g_assert (tile != NULL);
#endif
ptr = tile_data_pointer (tile, 0, ymin);
#ifdef HINTS_SANITY
g_assert (ptr != NULL);
#endif
for (y = ymin; y <= ymax; y++)
{
thishint = tile_get_rowhint (tile, y);
#ifdef HINTS_SANITY
if (thishint == TILEROWHINT_BROKEN)
g_error ("BROKEN y=%d", y);
if (thishint == TILEROWHINT_OUTOFRANGE)
g_error ("OOR y=%d", y);
if (thishint == TILEROWHINT_UNDEFINED)
g_error ("UNDEFINED y=%d - bpp=%d ew=%d eh=%d",
y, bpp, ewidth, eheight);
#endif
#ifdef HINTS_SANITY
if (thishint == TILEROWHINT_TRANSPARENT ||
thishint == TILEROWHINT_MIXED ||
thishint == TILEROWHINT_OPAQUE)
{
goto next_row4;
}
if (thishint != TILEROWHINT_UNKNOWN)
{
g_error ("MEGABOGUS y=%d - bpp=%d ew=%d eh=%d",
y, bpp, ewidth, eheight);
}
#endif
if (thishint == TILEROWHINT_UNKNOWN)
{
alpha = ptr[3];
/* row is all-opaque or all-transparent? */
if (alpha == 0 || alpha == 255)
{
if (ewidth > 1)
{
for (x = 1; x < ewidth; x++)
{
if (ptr[x * 4 + 3] != alpha)
{
tile_set_rowhint (tile, y, TILEROWHINT_MIXED);
goto next_row4;
}
}
}
tile_set_rowhint (tile, y,
(alpha == 0) ?
TILEROWHINT_TRANSPARENT :
TILEROWHINT_OPAQUE);
}
else
{
tile_set_rowhint (tile, y, TILEROWHINT_MIXED);
}
}
next_row4:
ptr += 4 * ewidth;
}
return;
}
if (bpp == 2)
{
#ifdef HINTS_SANITY
g_assert (tile != NULL);
#endif
ptr = tile_data_pointer (tile, 0, ymin);
#ifdef HINTS_SANITY
g_assert (ptr != NULL);
#endif
for (y = ymin; y <= ymax; y++)
{
thishint = tile_get_rowhint (tile, y);
#ifdef HINTS_SANITY
if (thishint == TILEROWHINT_BROKEN)
g_error ("BROKEN y=%d",y);
if (thishint == TILEROWHINT_OUTOFRANGE)
g_error ("OOR y=%d",y);
if (thishint == TILEROWHINT_UNDEFINED)
g_error ("UNDEFINED y=%d - bpp=%d ew=%d eh=%d",
y, bpp, ewidth, eheight);
#endif
#ifdef HINTS_SANITY
if (thishint == TILEROWHINT_TRANSPARENT ||
thishint == TILEROWHINT_MIXED ||
thishint == TILEROWHINT_OPAQUE)
{
goto next_row2;
}
if (thishint != TILEROWHINT_UNKNOWN)
{
g_error ("MEGABOGUS y=%d - bpp=%d ew=%d eh=%d",
y, bpp, ewidth, eheight);
}
#endif
if (thishint == TILEROWHINT_UNKNOWN)
{
alpha = ptr[1];
/* row is all-opaque or all-transparent? */
if (alpha == 0 || alpha == 255)
{
if (ewidth > 1)
{
for (x = 1; x < ewidth; x++)
{
if (ptr[x*2 + 1] != alpha)
{
tile_set_rowhint (tile, y, TILEROWHINT_MIXED);
goto next_row2;
}
}
}
tile_set_rowhint (tile, y,
(alpha == 0) ?
TILEROWHINT_TRANSPARENT :
TILEROWHINT_OPAQUE);
}
else
{
tile_set_rowhint (tile, y, TILEROWHINT_MIXED);
}
}
next_row2:
ptr += 2 * ewidth;
}
return;
}
g_warning ("update_tile_rowhints: Don't know about tiles with bpp==%d", bpp);
}
/*
* The equations: g(r) = exp (- r^2 / (2 * sigma^2))
* r = sqrt (x^2 + y ^2)
*/
static gint *
make_curve (gdouble sigma,
guint *length)
{
gint *curve;
gdouble sigma2;
gdouble l;
gint temp;
gint i, n;
sigma2 = 2 * sigma * sigma;
l = sqrt (-sigma2 * log (1.0 / 255.0));
n = ceil (l) * 2;
if ((n % 2) == 0)
n += 1;
curve = g_new (gint, n);
*length = n / 2;
curve += *length;
curve[0] = 255;
for (i = 1; i <= *length; i++)
{
temp = (gint) (exp (- (i * i) / sigma2) * 255);
curve[-i] = temp;
curve[i] = temp;
}
return curve;
}
static inline void
run_length_encode (const guchar *src,
guint *dest,
guint w,
guint bytes)
{
guint start;
guint i;
guint j;
guchar last;
last = *src;
src += bytes;
start = 0;
for (i = 1; i < w; i++)
{
if (*src != last)
{
for (j = start; j < i; j++)
{
*dest++ = (i - j);
*dest++ = last;
}
start = i;
last = *src;
}
src += bytes;
}
for (j = start; j < i; j++)
{
*dest++ = (i - j);
*dest++ = last;
}
}
/* Note: cubic function no longer clips result */
static inline gdouble
cubic (gdouble dx,
gint jm1,
gint j,
gint jp1,
gint jp2)
{
/* Catmull-Rom - not bad */
return (gdouble) ((( ( - jm1 + 3 * j - 3 * jp1 + jp2 ) * dx +
( 2 * jm1 - 5 * j + 4 * jp1 - jp2 ) ) * dx +
( - jm1 + jp1 ) ) * dx + (j + j) ) / 2.0;
}
/*********************/
/* FUNCTIONS */
/*********************/
void
paint_funcs_setup (void)
{
GRand *gr;
gint i;
/* generate a table of random seeds */
gr = g_rand_new_with_seed (RANDOM_SEED);
for (i = 0; i < RANDOM_TABLE_SIZE; i++)
random_table[i] = g_rand_int (gr);
for (i = 0; i < 256; i++)
add_lut[i] = i;
for (i = 256; i <= 510; i++)
add_lut[i] = 255;
g_rand_free (gr);
}
void
paint_funcs_free (void)
{
}
void
combine_indexed_and_indexed_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
gint b;
guchar new_alpha;
const guchar *m;
gint tmp;
if (mask)
{
m = mask;
while (length --)
{
new_alpha = INT_MULT(*m , opacity, tmp);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b] && new_alpha > 127) ? src2[b] : src1[b];
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
else
{
while (length --)
{
new_alpha = opacity;
for (b = 0; b < bytes; b++)
dest[b] = (affect[b] && new_alpha > 127) ? src2[b] : src1[b];
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
}
void
combine_indexed_and_indexed_a_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
gint b, alpha;
guchar new_alpha;
gint src2_bytes;
glong tmp;
const guchar *m;
alpha = 1;
src2_bytes = 2;
if (mask)
{
m = mask;
while (length --)
{
new_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b] && new_alpha > 127) ? src2[b] : src1[b];
m++;
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
else
{
while (length --)
{
new_alpha = INT_MULT(src2[alpha], opacity, tmp);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b] && new_alpha > 127) ? src2[b] : src1[b];
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
}
void
combine_indexed_a_and_indexed_a_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
const guchar * m;
gint b, alpha;
guchar new_alpha;
glong tmp;
alpha = 1;
if (mask)
{
m = mask;
while (length --)
{
new_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
for (b = 0; b < alpha; b++)
dest[b] = (affect[b] && new_alpha > 127) ? src2[b] : src1[b];
dest[alpha] = (affect[alpha] && new_alpha > 127) ?
OPAQUE_OPACITY : src1[alpha];
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
else
{
while (length --)
{
new_alpha = INT_MULT(src2[alpha], opacity, tmp);
for (b = 0; b < alpha; b++)
dest[b] = (affect[b] && new_alpha > 127) ? src2[b] : src1[b];
dest[alpha] = (affect[alpha] && new_alpha > 127) ?
OPAQUE_OPACITY : src1[alpha];
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
}
void
combine_inten_a_and_indexed_a_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
const guchar *cmap,
guint opacity,
guint length,
guint bytes)
{
gint b, alpha;
guchar new_alpha;
gint src2_bytes;
gint index;
glong tmp;
const guchar *m;
alpha = 1;
src2_bytes = 2;
if (mask)
{
m = mask;
while (length --)
{
new_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
index = src2[0] * 3;
for (b = 0; b < bytes-1; b++)
dest[b] = (new_alpha > 127) ? cmap[index + b] : src1[b];
dest[b] = (new_alpha > 127) ? OPAQUE_OPACITY : src1[b];
/* alpha channel is opaque */
m++;
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
else
{
while (length --)
{
new_alpha = INT_MULT(src2[alpha], opacity, tmp);
index = src2[0] * 3;
for (b = 0; b < bytes-1; b++)
dest[b] = (new_alpha > 127) ? cmap[index + b] : src1[b];
dest[b] = (new_alpha > 127) ? OPAQUE_OPACITY : src1[b];
/* alpha channel is opaque */
/* m++; /Per */
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
}
void
combine_inten_and_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
const guchar * m;
gint b;
guchar new_alpha;
gint tmp;
if (mask)
{
m = mask;
while (length --)
{
new_alpha = INT_MULT(*m, opacity, tmp);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b]) ?
INT_BLEND(src2[b], src1[b], new_alpha, tmp) :
src1[b];
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
else
{
while (length --)
{
for (b = 0; b < bytes; b++)
dest[b] = (affect[b]) ?
INT_BLEND(src2[b], src1[b], opacity, tmp) :
src1[b];
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
}
void
combine_inten_and_inten_a_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
gint alpha, b;
gint src2_bytes;
guchar new_alpha;
const guchar *m;
register glong t1;
alpha = bytes;
src2_bytes = bytes + 1;
if (mask)
{
m = mask;
while (length --)
{
new_alpha = INT_MULT3(src2[alpha], *m, opacity, t1);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b]) ?
INT_BLEND(src2[b], src1[b], new_alpha, t1) :
src1[b];
m++;
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
else
{
if (bytes == 3 && affect[0] && affect[1] && affect[2])
while (length --)
{
new_alpha = INT_MULT(src2[alpha],opacity,t1);
dest[0] = INT_BLEND(src2[0] , src1[0] , new_alpha, t1);
dest[1] = INT_BLEND(src2[1] , src1[1] , new_alpha, t1);
dest[2] = INT_BLEND(src2[2] , src1[2] , new_alpha, t1);
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
else
while (length --)
{
new_alpha = INT_MULT(src2[alpha],opacity,t1);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b]) ?
INT_BLEND(src2[b] , src1[b] , new_alpha, t1) :
src1[b];
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
}
/*orig #define alphify(src2_alpha,new_alpha) \
if (new_alpha == 0 || src2_alpha == 0) \
{ \
for (b = 0; b < alpha; b++) \
dest[b] = src1 [b]; \
} \
else if (src2_alpha == new_alpha){ \
for (b = 0; b < alpha; b++) \
dest [b] = affect [b] ? src2 [b] : src1 [b]; \
} else { \
ratio = (float) src2_alpha / new_alpha; \
compl_ratio = 1.0 - ratio; \
\
for (b = 0; b < alpha; b++) \
dest[b] = affect[b] ? \
(guchar) (src2[b] * ratio + src1[b] * compl_ratio + EPSILON) : src1[b]; \
}*/
/*shortened #define alphify(src2_alpha,new_alpha) \
if (src2_alpha != 0 && new_alpha != 0) \
{ \
if (src2_alpha == new_alpha){ \
for (b = 0; b < alpha; b++) \
dest [b] = affect [b] ? src2 [b] : src1 [b]; \
} else { \
ratio = (float) src2_alpha / new_alpha; \
compl_ratio = 1.0 - ratio; \
\
for (b = 0; b < alpha; b++) \
dest[b] = affect[b] ? \
(guchar) (src2[b] * ratio + src1[b] * compl_ratio + EPSILON) : src1[b];\
} \
}*/
#define alphify(src2_alpha,new_alpha) \
if (src2_alpha != 0 && new_alpha != 0) \
{ \
b = alpha; \
if (src2_alpha == new_alpha){ \
do { \
b--; dest [b] = affect [b] ? src2 [b] : src1 [b];} while (b); \
} else { \
ratio = (float) src2_alpha / new_alpha; \
compl_ratio = 1.0 - ratio; \
\
do { b--; \
dest[b] = affect[b] ? \
(guchar) (src2[b] * ratio + src1[b] * compl_ratio + EPSILON) : src1[b];\
} while (b); \
} \
}
/*special #define alphify4(src2_alpha,new_alpha) \
if (src2_alpha != 0 && new_alpha != 0) \
{ \
if (src2_alpha == new_alpha){ \
dest [0] = affect [0] ? src2 [0] : src1 [0]; \
dest [1] = affect [1] ? src2 [1] : src1 [1]; \
dest [2] = affect [2] ? src2 [2] : src1 [2]; \
} else { \
ratio = (float) src2_alpha / new_alpha; \
compl_ratio = 1.0 - ratio; \
\
dest[0] = affect[0] ? \
(guchar) (src2[0] * ratio + src1[0] * compl_ratio + EPSILON) : src1[0]; \
dest[1] = affect[1] ? \
(guchar) (src2[1] * ratio + src1[1] * compl_ratio + EPSILON) : src1[1]; \
dest[2] = affect[2] ? \
(guchar) (src2[2] * ratio + src1[2] * compl_ratio + EPSILON) : src1[2]; \
} \
}*/
void
combine_inten_a_and_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint mode_affect, /* how does the combination mode affect alpha? */
guint length,
guint bytes) /* 4 or 2 depending on RGBA or GRAYA */
{
gint alpha, b;
gint src2_bytes;
guchar src2_alpha;
guchar new_alpha;
const guchar *m;
gfloat ratio, compl_ratio;
glong tmp;
src2_bytes = bytes - 1;
alpha = bytes - 1;
if (mask)
{
m = mask;
if (opacity == OPAQUE_OPACITY) /* HAS MASK, FULL OPACITY */
{
while (length--)
{
src2_alpha = *m;
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
else /* HAS MASK, SEMI-OPACITY */
{
while (length--)
{
src2_alpha = INT_MULT(*m, opacity, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
}
else /* NO MASK */
{
while (length --)
{
src2_alpha = opacity;
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
else
dest[alpha] = (src1[alpha]) ? src1[alpha] : (affect[alpha] ? new_alpha : src1[alpha]);
src1 += bytes;
src2 += src2_bytes;
dest += bytes;
}
}
}
void
combine_inten_a_and_inten_a_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint mode_affect, /* how does the combination mode affect alpha? */
guint length,
guint bytes) /* 4 or 2 depending on RGBA or GRAYA */
{
guint b;
guchar src2_alpha;
guchar new_alpha;
gfloat ratio, compl_ratio;
glong tmp;
const guint alpha = bytes - 1;
if (mask)
{
const guchar *m = mask;
if (opacity == OPAQUE_OPACITY) /* HAS MASK, FULL OPACITY */
{
const gint* mask_ip;
gint i,j;
if (length >= sizeof(int))
{
/* HEAD */
i = (GPOINTER_TO_INT(m) & (sizeof(int)-1));
if (i != 0)
{
i = sizeof(int) - i;
length -= i;
while (i--)
{
/* GUTS */
src2_alpha = INT_MULT(src2[alpha], *m, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
/* GUTS END */
}
}
/* BODY */
mask_ip = (const gint *)m;
i = length / sizeof(int);
length %= sizeof(int);
while (i--)
{
if (*mask_ip)
{
m = (const guchar*)mask_ip;
j = sizeof(int);
while (j--)
{
/* GUTS */
src2_alpha = INT_MULT(src2[alpha], *m, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
/* GUTS END */
}
}
else
{
j = bytes * sizeof(int);
src2 += j;
while (j--)
{
*(dest++) = *(src1++);
}
}
mask_ip++;
}
m = (const guchar*)mask_ip;
}
/* TAIL */
while (length--)
{
/* GUTS */
src2_alpha = INT_MULT(src2[alpha], *m, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
/* GUTS END */
}
}
else /* HAS MASK, SEMI-OPACITY */
{
const gint* mask_ip;
gint i,j;
if (length >= sizeof(int))
{
/* HEAD */
i = (GPOINTER_TO_INT(m) & (sizeof(int)-1));
if (i != 0)
{
i = sizeof(int) - i;
length -= i;
while (i--)
{
/* GUTS */
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
/* GUTS END */
}
}
/* BODY */
mask_ip = (const gint *)m;
i = length / sizeof(int);
length %= sizeof(int);
while (i--)
{
if (*mask_ip)
{
m = (const guchar*)mask_ip;
j = sizeof(int);
while (j--)
{
/* GUTS */
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
/* GUTS END */
}
}
else
{
j = bytes * sizeof(int);
src2 += j;
while (j--)
{
*(dest++) = *(src1++);
}
}
mask_ip++;
}
m = (const guchar*)mask_ip;
}
/* TAIL */
while (length--)
{
/* GUTS */
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
/* GUTS END */
}
}
}
else
{
if (opacity == OPAQUE_OPACITY) /* NO MASK, FULL OPACITY */
{
while (length --)
{
src2_alpha = src2[alpha];
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
else /* NO MASK, SEMI OPACITY */
{
while (length --)
{
src2_alpha = INT_MULT(src2[alpha], opacity, tmp);
new_alpha = src1[alpha] +
INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
alphify (src2_alpha, new_alpha);
if (mode_affect)
{
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
}
else
{
dest[alpha] = (src1[alpha]) ? src1[alpha] :
(affect[alpha] ? new_alpha : src1[alpha]);
}
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
}
}
#undef alphify
void
combine_inten_a_and_channel_mask_pixels (const guchar *src,
const guchar *channel,
guchar *dest,
const guchar *col,
guint opacity,
guint length,
guint bytes)
{
gint alpha, b;
guchar channel_alpha;
guchar new_alpha;
guchar compl_alpha;
gint t, s;
alpha = bytes - 1;
while (length --)
{
channel_alpha = INT_MULT (255 - *channel, opacity, t);
if (channel_alpha)
{
new_alpha = src[alpha] + INT_MULT ((255 - src[alpha]), channel_alpha, t);
if (new_alpha != 255)
channel_alpha = (channel_alpha * 255) / new_alpha;
compl_alpha = 255 - channel_alpha;
for (b = 0; b < alpha; b++)
dest[b] = INT_MULT (col[b], channel_alpha, t) +
INT_MULT (src[b], compl_alpha, s);
dest[b] = new_alpha;
}
else
memcpy(dest, src, bytes);
/* advance pointers */
src+=bytes;
dest+=bytes;
channel++;
}
}
void
combine_inten_a_and_channel_selection_pixels (const guchar *src,
const guchar *channel,
guchar *dest,
const guchar *col,
guint opacity,
guint length,
guint bytes)
{
gint alpha, b;
guchar channel_alpha;
guchar new_alpha;
guchar compl_alpha;
gint t, s;
alpha = bytes - 1;
while (length --)
{
channel_alpha = INT_MULT (*channel, opacity, t);
if (channel_alpha)
{
new_alpha = src[alpha] + INT_MULT ((255 - src[alpha]), channel_alpha, t);
if (new_alpha != 255)
channel_alpha = (channel_alpha * 255) / new_alpha;
compl_alpha = 255 - channel_alpha;
for (b = 0; b < alpha; b++)
dest[b] = INT_MULT (col[b], channel_alpha, t) +
INT_MULT (src[b], compl_alpha, s);
dest[b] = new_alpha;
}
else
memcpy(dest, src, bytes);
/* advance pointers */
src+=bytes;
dest+=bytes;
channel++;
}
}
/* paint "behind" the existing pixel row.
* This is similar in appearance to painting on a layer below
* the existing pixels.
*/
static inline void
behind_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes1,
guint bytes2)
{
/* FIXME: Is this supposed to be different than in the other functions? */
const guint alpha = bytes1 - 1;
guint b;
guchar src1_alpha;
guchar src2_alpha;
guchar new_alpha;
const guchar *m;
gfloat ratio, compl_ratio;
glong tmp;
if (mask)
m = mask;
else
m = &no_mask;
while (length --)
{
src1_alpha = src1[alpha];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
new_alpha = src2_alpha +
INT_MULT((255 - src2_alpha), src1_alpha, tmp);
if (new_alpha)
ratio = (float) src1_alpha / new_alpha;
else
ratio = 0.0;
compl_ratio = 1.0 - ratio;
for (b = 0; b < alpha; b++)
dest[b] = (affect[b]) ?
(guchar) (src1[b] * ratio + src2[b] * compl_ratio + EPSILON) :
src1[b];
dest[alpha] = (affect[alpha]) ? new_alpha : src1[alpha];
if (mask)
m++;
src1 += bytes1;
src2 += bytes2;
dest += bytes1;
}
}
/* paint "behind" the existing pixel row (for indexed images).
* This is similar in appearance to painting on a layer below
* the existing pixels.
*/
static inline void
behind_indexed_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes1,
guint bytes2)
{
const guint alpha = bytes1 - 1;
guint b;
guchar src1_alpha;
guchar src2_alpha;
guchar new_alpha;
const guchar *m;
glong tmp;
if (mask)
m = mask;
else
m = &no_mask;
/* the alpha channel */
while (length --)
{
src1_alpha = src1[alpha];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
new_alpha = (src2_alpha > 127) ? OPAQUE_OPACITY : TRANSPARENT_OPACITY;
for (b = 0; b < bytes1; b++)
dest[b] = (affect[b] && new_alpha == OPAQUE_OPACITY && (src1_alpha > 127)) ?
src2[b] : src1[b];
if (mask)
m++;
src1 += bytes1;
src2 += bytes2;
dest += bytes1;
}
}
/* replace the contents of one pixel row with the other
* The operation is still bounded by mask/opacity constraints
*/
static inline void
replace_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes1,
guint bytes2)
{
const guint has_alpha1 = HAS_ALPHA (bytes1);
const guint has_alpha2 = HAS_ALPHA (bytes2);
const guint bytes = MIN (bytes1, bytes2);
guint b;
gint tmp;
if (mask)
{
guchar mask_alpha;
const guchar *m = mask;
while (length --)
{
mask_alpha = INT_MULT(*m, opacity, tmp);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b]) ?
INT_BLEND(src2[b], src1[b], mask_alpha, tmp) :
src1[b];
if (has_alpha1 && !has_alpha2)
dest[b] = src1[b];
m++;
src1 += bytes1;
src2 += bytes2;
dest += bytes1;
}
}
else
{
const guchar mask_alpha = OPAQUE_OPACITY;
while (length --)
{
for (b = 0; b < bytes; b++)
dest[b] = (affect[b]) ?
INT_BLEND(src2[b], src1[b], mask_alpha, tmp) :
src1[b];
if (has_alpha1 && !has_alpha2)
dest[b] = src1[b];
src1 += bytes1;
src2 += bytes2;
dest += bytes1;
}
}
}
/* replace the contents of one pixel row with the other
* The operation is still bounded by mask/opacity constraints
*/
static inline void
replace_indexed_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes1,
guint bytes2)
{
const guint has_alpha1 = HAS_ALPHA (bytes1);
const guint has_alpha2 = HAS_ALPHA (bytes2);
const guint bytes = MIN (bytes1, bytes2);
const guchar *m;
guint b;
guchar mask_alpha;
gint tmp;
if (mask)
m = mask;
else
m = &no_mask;
while (length --)
{
mask_alpha = INT_MULT(*m, opacity, tmp);
for (b = 0; b < bytes; b++)
dest[b] = (affect[b] && mask_alpha) ? src2[b] : src1[b];
if (has_alpha1 && !has_alpha2)
dest[b] = src1[b];
if (mask)
m++;
src1 += bytes1;
src2 += bytes2;
dest += bytes1;
}
}
/* apply source 2 to source 1, but in a non-additive way,
* multiplying alpha channels (works for intensity)
*/
static inline void
erase_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
const guint alpha = bytes - 1;
guint b;
guchar src2_alpha;
glong tmp;
if (mask)
{
const guchar *m = mask;
while (length --)
{
for (b = 0; b < alpha; b++)
dest[b] = src1[b];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
dest[alpha] = src1[alpha] - INT_MULT(src1[alpha], src2_alpha, tmp);
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
else
{
const guchar *m = &no_mask;
while (length --)
{
for (b = 0; b < alpha; b++)
dest[b] = src1[b];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
dest[alpha] = src1[alpha] - INT_MULT(src1[alpha], src2_alpha, tmp);
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
}
/* apply source 2 to source 1, but in a non-additive way,
* multiplying alpha channels (works for indexed)
*/
static inline void
erase_indexed_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
const guint alpha = bytes - 1;
const guchar *m;
guchar src2_alpha;
guint b;
glong tmp;
if (mask)
m = mask;
else
m = &no_mask;
while (length --)
{
for (b = 0; b < alpha; b++)
dest[b] = src1[b];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
dest[alpha] = (src2_alpha > 127) ? TRANSPARENT_OPACITY : src1[alpha];
if (mask)
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
void
anti_erase_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
gint alpha, b;
guchar src2_alpha;
const guchar *m;
glong tmp;
if (mask)
m = mask;
else
m = &no_mask;
alpha = bytes - 1;
while (length --)
{
for (b = 0; b < alpha; b++)
dest[b] = src1[b];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
dest[alpha] = src1[alpha] + INT_MULT((255 - src1[alpha]), src2_alpha, tmp);
if (mask)
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
void
anti_erase_indexed_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
gint alpha, b;
guchar src2_alpha;
const guchar *m;
glong tmp;
if (mask)
m = mask;
else
m = &no_mask;
alpha = bytes - 1;
while (length --)
{
for (b = 0; b < alpha; b++)
dest[b] = src1[b];
src2_alpha = INT_MULT3(src2[alpha], *m, opacity, tmp);
dest[alpha] = (src2_alpha > 127) ? OPAQUE_OPACITY : src1[alpha];
if (mask)
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
static void
color_erase_helper (GimpRGB *src,
const GimpRGB *color)
{
GimpRGB alpha;
alpha.a = src->a;
if (color->r < 0.0001)
alpha.r = src->r;
else if ( src->r > color->r )
alpha.r = (src->r - color->r) / (1.0 - color->r);
else if (src->r < color->r)
alpha.r = (color->r - src->r) / color->r;
else alpha.r = 0.0;
if (color->g < 0.0001)
alpha.g = src->g;
else if ( src->g > color->g )
alpha.g = (src->g - color->g) / (1.0 - color->g);
else if ( src->g < color->g )
alpha.g = (color->g - src->g) / (color->g);
else alpha.g = 0.0;
if (color->b < 0.0001)
alpha.b = src->b;
else if ( src->b > color->b )
alpha.b = (src->b - color->b) / (1.0 - color->b);
else if ( src->b < color->b )
alpha.b = (color->b - src->b) / (color->b);
else alpha.b = 0.0;
if ( alpha.r > alpha.g )
{
if ( alpha.r > alpha.b )
{
src->a = alpha.r;
}
else
{
src->a = alpha.b;
}
}
else if ( alpha.g > alpha.b )
{
src->a = alpha.g;
}
else
{
src->a = alpha.b;
}
src->a = (1.0 - color->a) + (src->a * color->a);
if (src->a < 0.0001)
return;
src->r = (src->r - color->r) / src->a + color->r;
src->g = (src->g - color->g) / src->a + color->g;
src->b = (src->b - color->b) / src->a + color->b;
src->a *= alpha.a;
}
void
color_erase_inten_pixels (const guchar *src1,
const guchar *src2,
guchar *dest,
const guchar *mask,
guint opacity,
const gboolean *affect,
guint length,
guint bytes)
{
guchar src2_alpha;
const guchar *m;
glong tmp;
GimpRGB bgcolor, color;
if (mask)
m = mask;
else
m = &no_mask;
while (length --)
{
switch (bytes)
{
case 2:
src2_alpha = INT_MULT3 (src2[1], *m, opacity, tmp);
gimp_rgba_set_uchar (&color,
src1[0], src1[0], src1[0], src1[1]);
gimp_rgba_set_uchar (&bgcolor,
src2[0], src2[0], src2[0], src2_alpha);
color_erase_helper (&color, &bgcolor);
gimp_rgba_get_uchar (&color, dest, NULL, NULL, dest + 1);
break;
case 4:
src2_alpha = INT_MULT3 (src2[3], *m, opacity, tmp);
gimp_rgba_set_uchar (&color,
src1[0], src1[1], src1[2], src1[3]);
gimp_rgba_set_uchar (&bgcolor,
src2[0], src2[1], src2[2], src2_alpha);
color_erase_helper (&color, &bgcolor);
gimp_rgba_get_uchar (&color, dest, dest + 1, dest + 2, dest + 3);
break;
}
if (mask)
m++;
src1 += bytes;
src2 += bytes;
dest += bytes;
}
}
void
extract_from_inten_pixels (guchar *src,
guchar *dest,
const guchar *mask,
const guchar *bg,
guint cut,
guint length,
guint bytes,
guint has_alpha)
{
gint b, alpha;
gint dest_bytes;
const guchar *m;
gint tmp;
if (mask)
m = mask;
else
m = &no_mask;
alpha = (has_alpha) ? bytes - 1 : bytes;
dest_bytes = (has_alpha) ? bytes : bytes + 1;
while (length --)
{
for (b = 0; b < alpha; b++)
dest[b] = src[b];
if (has_alpha)
{
dest[alpha] = INT_MULT(*m, src[alpha], tmp);
if (cut)
src[alpha] = INT_MULT((255 - *m), src[alpha], tmp);
}
else
{
dest[alpha] = *m;
if (cut)
for (b = 0; b < bytes; b++)
src[b] = INT_BLEND(bg[b], src[b], *m, tmp);
}
if (mask)
m++;
src += bytes;
dest += dest_bytes;
}
}
void
extract_from_indexed_pixels (guchar *src,
guchar *dest,
const guchar *mask,
const guchar *cmap,
const guchar *bg,
guint cut,
guint length,
guint bytes,
guint has_alpha)
{
gint b;
gint index;
const guchar *m;
gint t;
if (mask)
m = mask;
else
m = &no_mask;
while (length --)
{
index = src[0] * 3;
for (b = 0; b < 3; b++)
dest[b] = cmap[index + b];
if (has_alpha)
{
dest[3] = INT_MULT (*m, src[1], t);
if (cut)
src[1] = INT_MULT ((255 - *m), src[1], t);
}
else
{
dest[3] = *m;
if (cut)
src[0] = (*m > 127) ? bg[0] : src[0];
}
if (mask)
m++;
src += bytes;
dest += 4;
}
}
/**************************************************/
/* REGION FUNCTIONS */
/**************************************************/
void
color_region (PixelRegion *dest,
const guchar *col)
{
gint h;
guchar *s;
void *pr;
for (pr = pixel_regions_register (1, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
h = dest->h;
s = dest->data;
if (dest->w * dest->bytes == dest->rowstride)
{
/* do it all in one function call if we can
* this hasn't been tested to see if it is a
* signifigant speed gain yet
*/
color_pixels (s, col, dest->w * h, dest->bytes);
}
else
{
while (h--)
{
color_pixels (s, col, dest->w, dest->bytes);
s += dest->rowstride;
}
}
}
}
void
color_region_mask (PixelRegion *dest,
PixelRegion *mask,
const guchar *col)
{
gint h;
guchar *d;
guchar *m;
void *pr;
for (pr = pixel_regions_register (2, dest, mask);
pr != NULL;
pr = pixel_regions_process (pr))
{
h = dest->h;
d = dest->data;
m = mask->data;
if (dest->w * dest->bytes == dest->rowstride &&
mask->w * mask->bytes == mask->rowstride)
{
/* do it all in one function call if we can
* this hasn't been tested to see if it is a
* signifigant speed gain yet
*/
color_pixels_mask (d, m, col, dest->w * h, dest->bytes);
}
else
{
while (h--)
{
color_pixels_mask (d, m, col, dest->w, dest->bytes);
d += dest->rowstride;
m += mask->rowstride;
}
}
}
}
void
pattern_region (PixelRegion *dest,
PixelRegion *mask,
TempBuf *pattern,
gint off_x,
gint off_y)
{
gint y;
guchar *d;
guchar *m = NULL;
void *pr;
for (pr = pixel_regions_register (2, dest, mask);
pr != NULL;
pr = pixel_regions_process (pr))
{
d = dest->data;
if (mask)
m = mask->data;
for (y = 0; y < dest->h; y++)
{
pattern_pixels_mask (d, m, pattern, dest->w, dest->bytes,
off_x + dest->x,
off_y + dest->y + y);
d += dest->rowstride;
if (mask)
m += mask->rowstride;
}
}
}
void
blend_region (PixelRegion *src1,
PixelRegion *src2,
PixelRegion *dest,
gint blend)
{
gint h;
guchar *s1, *s2, * d;
void *pr;
for (pr = pixel_regions_register (3, src1, src2, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
s1 = src1->data;
s2 = src2->data;
d = dest->data;
h = src1->h;
while (h --)
{
blend_pixels (s1, s2, d, blend, src1->w, src1->bytes);
s1 += src1->rowstride;
s2 += src2->rowstride;
d += dest->rowstride;
}
}
}
void
shade_region (PixelRegion *src,
PixelRegion *dest,
guchar *col,
gint blend)
{
gint h;
guchar *s, * d;
s = src->data;
d = dest->data;
h = src->h;
while (h --)
{
/* blend_pixels (s, d, col, blend, src->w, src->bytes);*/
s += src->rowstride;
d += dest->rowstride;
}
}
void
copy_region (PixelRegion *src,
PixelRegion *dest)
{
gint h;
gint pixelwidth;
guchar *s, *d;
void *pr;
#ifdef COWSHOW
fputc ('[',stderr);
#endif
for (pr = pixel_regions_register (2, src, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
if (src->tiles && dest->tiles &&
src->curtile && dest->curtile &&
src->offx == 0 && dest->offx == 0 &&
src->offy == 0 && dest->offy == 0 &&
src->w == tile_ewidth (src->curtile) &&
dest->w == tile_ewidth (dest->curtile) &&
src->h == tile_eheight (src->curtile) &&
dest->h == tile_eheight (dest->curtile))
{
#ifdef COWSHOW
fputc('!',stderr);
#endif
tile_manager_map_over_tile (dest->tiles, dest->curtile, src->curtile);
}
else
{
#ifdef COWSHOW
fputc ('.',stderr);
#endif
pixelwidth = src->w * src->bytes;
s = src->data;
d = dest->data;
h = src->h;
while (h --)
{
memcpy (d, s, pixelwidth);
s += src->rowstride;
d += dest->rowstride;
}
}
}
#ifdef COWSHOW
fputc (']',stderr);
fputc ('\n',stderr);
#endif
}
void
add_alpha_region (PixelRegion *src,
PixelRegion *dest)
{
gint h;
guchar *s, *d;
void *pr;
for (pr = pixel_regions_register (2, src, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
s = src->data;
d = dest->data;
h = src->h;
while (h --)
{
add_alpha_pixels (s, d, src->w, src->bytes);
s += src->rowstride;
d += dest->rowstride;
}
}
}
void
flatten_region (PixelRegion *src,
PixelRegion *dest,
guchar *bg)
{
gint h;
guchar *s, *d;
void *pr;
for (pr = pixel_regions_register (2, src, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
s = src->data;
d = dest->data;
h = src->h;
while (h --)
{
flatten_pixels (s, d, bg, src->w, src->bytes);
s += src->rowstride;
d += dest->rowstride;
}
}
}
void
extract_alpha_region (PixelRegion *src,
PixelRegion *mask,
PixelRegion *dest)
{
gint h;
guchar * s, * m, * d;
void * pr;
for (pr = pixel_regions_register (3, src, mask, dest); pr != NULL; pr = pixel_regions_process (pr))
{
s = src->data;
d = dest->data;
if (mask)
m = mask->data;
else
m = NULL;
h = src->h;
while (h --)
{
extract_alpha_pixels (s, m, d, src->w, src->bytes);
s += src->rowstride;
d += dest->rowstride;
if (mask)
m += mask->rowstride;
}
}
}
void
extract_from_region (PixelRegion *src,
PixelRegion *dest,
PixelRegion *mask,
guchar *cmap,
guchar *bg,
guint type,
guint has_alpha,
guint cut)
{
gint h;
guchar *s, *d, *m;
void *pr;
for (pr = pixel_regions_register (3, src, dest, mask);
pr != NULL;
pr = pixel_regions_process (pr))
{
s = src->data;
d = dest->data;
m = (mask) ? mask->data : NULL;
h = src->h;
while (h --)
{
switch (type)
{
case 0: /* RGB */
case 1: /* GRAY */
extract_from_inten_pixels (s, d, m, bg, cut, src->w,
src->bytes, has_alpha);
break;
case 2: /* INDEXED */
extract_from_indexed_pixels (s, d, m, cmap, bg, cut, src->w,
src->bytes, has_alpha);
break;
}
s += src->rowstride;
d += dest->rowstride;
if (mask)
m += mask->rowstride;
}
}
}
void
convolve_region (PixelRegion *srcR,
PixelRegion *destR,
gint *matrix,
gint size,
gint divisor,
GimpConvolutionType mode)
{
/* Convolve the src image using the convolution matrix, writing to dest */
/* Convolve is not tile-enabled--use accordingly */
guchar *src, *s_row, *s;
guchar *dest, *d;
gint *m;
gint total [4];
gint b, bytes;
gint length;
gint wraparound;
gint margin; /* margin imposed by size of conv. matrix */
gint i, j;
gint x, y;
gint offset;
/* If the mode is NEGATIVE_CONVOL, the offset should be 128 */
if (mode == GIMP_NEGATIVE_CONVOL)
{
offset = 128;
mode = GIMP_NORMAL_CONVOL;
}
else
offset = 0;
/* check for the boundary cases */
if (srcR->w < (size - 1) || srcR->h < (size - 1))
return;
/* Initialize some values */
bytes = srcR->bytes;
length = bytes * srcR->w;
margin = size / 2;
src = srcR->data;
dest = destR->data;
/* calculate the source wraparound value */
wraparound = srcR->rowstride - size * bytes;
/* copy the first (size / 2) scanlines of the src image... */
for (i = 0; i < margin; i++)
{
memcpy (dest, src, length);
src += srcR->rowstride;
dest += destR->rowstride;
}
src = srcR->data;
for (y = margin; y < srcR->h - margin; y++)
{
s_row = src;
s = s_row + srcR->rowstride*margin;
d = dest;
/* handle the first margin pixels... */
b = bytes * margin;
while (b --)
*d++ = *s++;
/* now, handle the center pixels */
x = srcR->w - margin*2;
while (x--)
{
s = s_row;
m = matrix;
total [0] = total [1] = total [2] = total [3] = 0;
i = size;
while (i --)
{
j = size;
while (j --)
{
for (b = 0; b < bytes; b++)
total [b] += *m * *s++;
m ++;
}
s += wraparound;
}
for (b = 0; b < bytes; b++)
{
total [b] = total [b] / divisor + offset;
if (total [b] < 0 && mode != GIMP_NORMAL_CONVOL)
total [b] = - total [b];
if (total [b] < 0)
*d++ = 0;
else
*d++ = (total [b] > 255) ? 255 : (guchar) total [b];
}
s_row += bytes;
}
/* handle the last pixel... */
s = s_row + (srcR->rowstride + bytes) * margin;
b = bytes * margin;
while (b --)
*d++ = *s++;
/* set the memory pointers */
src += srcR->rowstride;
dest += destR->rowstride;
}
src += srcR->rowstride*margin;
/* copy the last (margin) scanlines of the src image... */
for (i = 0; i < margin; i++)
{
memcpy (dest, src, length);
src += srcR->rowstride;
dest += destR->rowstride;
}
}
/* Convert from separated alpha to premultiplied alpha. Only works on
non-tiled regions! */
void
multiply_alpha_region (PixelRegion *srcR)
{
guchar *src, *s;
gint x, y;
gint width, height;
gint b, bytes;
gdouble alpha_val;
width = srcR->w;
height = srcR->h;
bytes = srcR->bytes;
src = srcR->data;
for (y = 0; y < height; y++)
{
s = src;
for (x = 0; x < width; x++)
{
alpha_val = s[bytes - 1] * (1.0 / 255.0);
for (b = 0; b < bytes - 1; b++)
s[b] = 0.5 + s[b] * alpha_val;
s += bytes;
}
src += srcR->rowstride;
}
}
/* Convert from premultiplied alpha to separated alpha. Only works on
non-tiled regions! */
void
separate_alpha_region (PixelRegion *srcR)
{
guchar *src, *s;
gint x, y;
gint width, height;
gint b, bytes;
gdouble alpha_recip;
gint new_val;
width = srcR->w;
height = srcR->h;
bytes = srcR->bytes;
src = srcR->data;
for (y = 0; y < height; y++)
{
s = src;
for (x = 0; x < width; x++)
{
/* predicate is equivalent to:
(((s[bytes - 1] - 1) & 255) + 2) & 256
*/
if (s[bytes - 1] != 0 && s[bytes - 1] != 255)
{
alpha_recip = 255.0 / s[bytes - 1];
for (b = 0; b < bytes - 1; b++)
{
new_val = 0.5 + s[b] * alpha_recip;
new_val = MIN (new_val, 255);
s[b] = new_val;
}
}
s += bytes;
}
src += srcR->rowstride;
}
}
void
gaussian_blur_region (PixelRegion *srcR,
gdouble radius_x,
gdouble radius_y)
{
gdouble std_dev;
glong width, height;
guint bytes;
guchar *src, *sp;
guchar *dest, *dp;
guchar *data;
gint *buf, *b;
gint pixels;
gint total;
gint i, row, col;
gint start, end;
gint *curve;
gint *sum;
gint val;
gint length;
gint alpha;
gint initial_p, initial_m;
if (radius_x == 0.0 && radius_y == 0.0) return; /* zero blur is a no-op */
/* allocate the result buffer */
length = MAX (srcR->w, srcR->h) * srcR->bytes;
data = g_new (guchar, length * 2);
src = data;
dest = data + length;
width = srcR->w;
height = srcR->h;
bytes = srcR->bytes;
alpha = bytes - 1;
buf = g_new (gint, MAX (width, height) * 2);
if (radius_y != 0.0)
{
std_dev = sqrt (-(radius_y * radius_y) / (2 * log (1.0 / 255.0)));
curve = make_curve (std_dev, &length);
sum = g_new (gint, 2 * length + 1);
sum[0] = 0;
for (i = 1; i <= length*2; i++)
sum[i] = curve[i - length - 1] + sum[i - 1];
sum += length;
total = sum[length] - sum[-length];
for (col = 0; col < width; col++)
{
pixel_region_get_col (srcR, col + srcR->x, srcR->y, height, src, 1);
sp = src + alpha;
initial_p = sp[0];
initial_m = sp[(height - 1) * bytes];
/* Determine a run-length encoded version of the column */
run_length_encode (sp, buf, height, bytes);
for (row = 0; row < height; row++)
{
start = (row < length) ? -row : -length;
end = (height <= (row + length)) ? (height - row - 1) : length;
val = 0;
i = start;
b = buf + (row + i) * 2;
if (start != -length)
val += initial_p * (sum[start] - sum[-length]);
while (i < end)
{
pixels = b[0];
i += pixels;
if (i > end)
i = end;
val += b[1] * (sum[i] - sum[start]);
b += (pixels * 2);
start = i;
}
if (end != length)
val += initial_m * (sum[length] - sum[end]);
sp[row * bytes] = val / total;
}
pixel_region_set_col (srcR, col + srcR->x, srcR->y, height, src);
}
g_free (sum - length);
g_free (curve - length);
}
if (radius_x != 0.0)
{
std_dev = sqrt (-(radius_x * radius_x) / (2 * log (1.0 / 255.0)));
curve = make_curve (std_dev, &length);
sum = g_new (gint, 2 * length + 1);
sum[0] = 0;
for (i = 1; i <= length * 2; i++)
sum[i] = curve[i - length - 1] + sum[i - 1];
sum += length;
total = sum[length] - sum[-length];
for (row = 0; row < height; row++)
{
pixel_region_get_row (srcR, srcR->x, row + srcR->y, width, src, 1);
sp = src + alpha;
dp = dest + alpha;
initial_p = sp[0];
initial_m = sp[(width - 1) * bytes];
/* Determine a run-length encoded version of the row */
run_length_encode (sp, buf, width, bytes);
for (col = 0; col < width; col++)
{
start = (col < length) ? -col : -length;
end = (width <= (col + length)) ? (width - col - 1) : length;
val = 0;
i = start;
b = buf + (col + i) * 2;
if (start != -length)
val += initial_p * (sum[start] - sum[-length]);
while (i < end)
{
pixels = b[0];
i += pixels;
if (i > end)
i = end;
val += b[1] * (sum[i] - sum[start]);
b += (pixels * 2);
start = i;
}
if (end != length)
val += initial_m * (sum[length] - sum[end]);
val = val / total;
dp[col * bytes] = val;
}
pixel_region_set_row (srcR, srcR->x, row + srcR->y, width, dest);
}
g_free (sum - length);
g_free (curve - length);
}
g_free (data);
g_free (buf);
}
/* non-interpolating scale_region. [adam]
*/
static void
scale_region_no_resample (PixelRegion *srcPR,
PixelRegion *destPR)
{
gint *x_src_offsets;
gint *y_src_offsets;
guchar *src;
guchar *dest;
gint width, height, orig_width, orig_height;
gint last_src_y;
gint row_bytes;
gint x, y, b;
gchar bytes;
orig_width = srcPR->w;
orig_height = srcPR->h;
width = destPR->w;
height = destPR->h;
bytes = srcPR->bytes;
/* the data pointers... */
x_src_offsets = g_new (gint, width * bytes);
y_src_offsets = g_new (gint, height);
src = g_new (guchar, orig_width * bytes);
dest = g_new (guchar, width * bytes);
/* pre-calc the scale tables */
for (b = 0; b < bytes; b++)
for (x = 0; x < width; x++)
x_src_offsets [b + x * bytes] =
b + bytes * ((x * orig_width + orig_width / 2) / width);
for (y = 0; y < height; y++)
y_src_offsets [y] = (y * orig_height + orig_height / 2) / height;
/* do the scaling */
row_bytes = width * bytes;
last_src_y = -1;
for (y = 0; y < height; y++)
{
/* if the source of this line was the same as the source
* of the last line, there's no point in re-rescaling.
*/
if (y_src_offsets[y] != last_src_y)
{
pixel_region_get_row (srcPR, 0, y_src_offsets[y], orig_width, src, 1);
for (x = 0; x < row_bytes ; x++)
{
dest[x] = src[x_src_offsets[x]];
}
last_src_y = y_src_offsets[y];
}
pixel_region_set_row (destPR, 0, y, width, dest);
}
g_free (x_src_offsets);
g_free (y_src_offsets);
g_free (src);
g_free (dest);
}
static void
get_premultiplied_double_row (PixelRegion *srcPR,
gint x,
gint y,
gint w,
gdouble *row,
guchar *tmp_src,
gint n)
{
gint b;
gint bytes = srcPR->bytes;
pixel_region_get_row (srcPR, x, y, w, tmp_src, n);
if (pixel_region_has_alpha (srcPR))
{
/* premultiply the alpha into the double array */
gdouble *irow = row;
gint alpha = bytes - 1;
gdouble mod_alpha;
for (x = 0; x < w; x++)
{
mod_alpha = tmp_src[alpha] / 255.0;
for (b = 0; b < alpha; b++)
irow[b] = mod_alpha * tmp_src[b];
irow[b] = tmp_src[alpha];
irow += bytes;
tmp_src += bytes;
}
}
else /* no alpha */
{
for (x = 0; x < w * bytes; x++)
row[x] = tmp_src[x];
}
/* set the off edge pixels to their nearest neighbor */
for (b = 0; b < 2 * bytes; b++)
row[b - 2 * bytes] = row[b % bytes];
for (b = 0; b < bytes * 2; b++)
row[b + w * bytes] = row[(w - 1) * bytes + b % bytes];
}
static void
expand_line (gdouble *dest,
gdouble *src,
gint bytes,
gint old_width,
gint width,
GimpInterpolationType interp)
{
gdouble ratio;
gint x,b;
gint src_col;
gdouble frac;
gdouble *s;
ratio = old_width / (gdouble) width;
/* we can overflow src's boundaries, so we expect our caller to have
allocated extra space for us to do so safely (see scale_region ()) */
/* this could be optimized much more by precalculating the coefficients for
each x */
switch(interp)
{
case GIMP_INTERPOLATION_CUBIC:
for (x = 0; x < width; x++)
{
src_col = ((int) (x * ratio + 2.0 - 0.5)) - 2;
/* +2, -2 is there because (int) rounds towards 0 and we need
to round down */
frac = (x * ratio - 0.5) - src_col;
s = &src[src_col * bytes];
for (b = 0; b < bytes; b++)
dest[b] = cubic (frac, s[b - bytes], s[b], s[b + bytes],
s[b + bytes * 2]);
dest += bytes;
}
break;
case GIMP_INTERPOLATION_LINEAR:
for (x = 0; x < width; x++)
{
src_col = ((int) (x * ratio + 2.0 - 0.5)) - 2;
/* +2, -2 is there because (int) rounds towards 0 and we need
to round down */
frac = (x * ratio - 0.5) - src_col;
s = &src[src_col * bytes];
for (b = 0; b < bytes; b++)
dest[b] = ((s[b + bytes] - s[b]) * frac + s[b]);
dest += bytes;
}
break;
case GIMP_INTERPOLATION_NONE:
g_assert_not_reached ();
break;
}
}
static void
shrink_line (gdouble *dest,
gdouble *src,
gint bytes,
gint old_width,
gint width,
GimpInterpolationType interp)
{
gint x;
gint b;
gdouble *srcp;
gdouble *destp;
gdouble accum[4];
gdouble slice;
const gdouble avg_ratio = (gdouble) width / old_width;
const gdouble inv_width = 1.0 / width;
gint slicepos; /* slice position relative to width */
#if 0
g_printerr ("shrink_line bytes=%d old_width=%d width=%d interp=%d "
"avg_ratio=%f\n",
bytes, old_width, width, interp, avg_ratio);
#endif
g_return_if_fail (bytes <= 4);
/* This algorithm calculates the weighted average of pixel data that
each output pixel must receive, taking into account that it always
scales down, i.e. there's always more than one input pixel per each
output pixel. */
srcp = src;
destp = dest;
slicepos = 0;
/* Initialize accum to the first pixel slice. As there is no partial
pixel at start, that value is 0. The source data is interleaved, so
we maintain BYTES accumulators at the same time to deal with that
many channels simultaneously. */
for (b = 0; b < bytes; b++)
accum[b] = 0.0;
for (x = 0; x < width; x++)
{
/* Accumulate whole pixels. */
do
{
for (b = 0; b < bytes; b++)
accum[b] += *srcp++;
slicepos += width;
}
while (slicepos < old_width);
slicepos -= old_width;
if (! (slicepos < width))
g_warning ("Assertion (slicepos < width) failed. Please report.");
if (slicepos == 0)
{
/* Simplest case: we have reached a whole pixel boundary. Store
the average value per channel and reset the accumulators for
the next round.
The main reason to treat this case separately is to avoid an
access to out-of-bounds memory for the first pixel. */
for (b = 0; b < bytes; b++)
{
*destp++ = accum[b] * avg_ratio;
accum[b] = 0.0;
}
}
else
{
for (b = 0; b < bytes; b++)
{
/* We have accumulated a whole pixel per channel where just a
slice of it was needed. Subtract now the previous pixel's
extra slice. */
slice = srcp[- bytes + b] * slicepos * inv_width;
*destp++ = (accum[b] - slice) * avg_ratio;
/* That slice is the initial value for the next round. */
accum[b] = slice;
}
}
}
/* Sanity check: srcp should point to the next-to-last position, and
slicepos should be zero. */
if (! (srcp - src == old_width * bytes && slicepos == 0))
g_warning ("Assertion (srcp - src == old_width * bytes && slicepos == 0)"
" failed. Please report.");
}
static inline void
rotate_pointers (guchar **p,
guint32 n)
{
guint32 i;
guchar *tmp;
tmp = p[0];
for (i = 0; i < n-1; i++)
{
p[i] = p[i+1];
}
p[i] = tmp;
}
static void
get_scaled_row (gdouble **src,
gint y,
gint new_width,
PixelRegion *srcPR,
gdouble *row,
guchar *src_tmp,
GimpInterpolationType interpolation_type)
{
/* get the necesary lines from the source image, scale them,
and put them into src[] */
rotate_pointers ((gpointer) src, 4);
if (y < 0)
y = 0;
if (y < srcPR->h)
{
get_premultiplied_double_row (srcPR, 0, y, srcPR->w,
row, src_tmp, 1);
if (new_width > srcPR->w)
expand_line(src[3], row, srcPR->bytes,
srcPR->w, new_width, interpolation_type);
else if (srcPR->w > new_width)
shrink_line(src[3], row, srcPR->bytes,
srcPR->w, new_width, interpolation_type);
else /* no scailing needed */
memcpy(src[3], row, sizeof (gdouble) * new_width * srcPR->bytes);
}
else
memcpy(src[3], src[2], sizeof (gdouble) * new_width * srcPR->bytes);
}
void
scale_region (PixelRegion *srcPR,
PixelRegion *destPR,
GimpInterpolationType interpolation,
GimpProgressFunc progress_callback,
gpointer progress_data)
{
gdouble *src[4];
guchar *src_tmp;
guchar *dest;
gdouble *row, *accum;
gint bytes, b;
gint width, height;
gint orig_width, orig_height;
gdouble y_rat;
gint i;
gint old_y = -4;
gint new_y;
gint x, y;
if (interpolation == GIMP_INTERPOLATION_NONE)
{
scale_region_no_resample (srcPR, destPR);
return;
}
orig_width = srcPR->w;
orig_height = srcPR->h;
width = destPR->w;
height = destPR->h;
#if 0
g_printerr ("scale_region: (%d x %d) -> (%d x %d)\n",
orig_width, orig_height, width, height);
#endif
/* find the ratios of old y to new y */
y_rat = (gdouble) orig_height / (gdouble) height;
bytes = destPR->bytes;
/* the data pointers... */
for (i = 0; i < 4; i++)
src[i] = g_new (gdouble, width * bytes);
dest = g_new (guchar, width * bytes);
src_tmp = g_new (guchar, orig_width * bytes);
/* offset the row pointer by 2*bytes so the range of the array
is [-2*bytes] to [(orig_width + 2)*bytes] */
row = g_new (gdouble, (orig_width + 2 * 2) * bytes);
row += bytes * 2;
accum = g_new (gdouble, width * bytes);
/* Scale the selected region */
for (y = 0; y < height; y++)
{
if (progress_callback && !(y & 0xf))
(* progress_callback) (0, height, y, progress_data);
if (height < orig_height)
{
gint max;
gdouble frac;
const gdouble inv_ratio = 1.0 / y_rat;
if (y == 0) /* load the first row if this is the first time through */
get_scaled_row (&src[0], 0, width, srcPR, row,
src_tmp,
interpolation);
new_y = (int) (y * y_rat);
frac = 1.0 - (y * y_rat - new_y);
for (x = 0; x < width * bytes; x++)
accum[x] = src[3][x] * frac;
max = (int) ((y + 1) * y_rat) - new_y - 1;
get_scaled_row (&src[0], ++new_y, width, srcPR, row,
src_tmp,
interpolation);
while (max > 0)
{
for (x = 0; x < width * bytes; x++)
accum[x] += src[3][x];
get_scaled_row (&src[0], ++new_y, width, srcPR, row,
src_tmp,
interpolation);
max--;
}
frac = (y + 1) * y_rat - ((int) ((y + 1) * y_rat));
for (x = 0; x < width * bytes; x++)
{
accum[x] += frac * src[3][x];
accum[x] *= inv_ratio;
}
}
else if (height > orig_height)
{
new_y = floor (y * y_rat - 0.5);
while (old_y <= new_y)
{
/* get the necesary lines from the source image, scale them,
and put them into src[] */
get_scaled_row (&src[0], old_y + 2, width, srcPR, row,
src_tmp,
interpolation);
old_y++;
}
switch (interpolation)
{
case GIMP_INTERPOLATION_CUBIC:
{
gdouble p0, p1, p2, p3;
gdouble dy = (y * y_rat - 0.5) - new_y;
p0 = cubic (dy, 1, 0, 0, 0);
p1 = cubic (dy, 0, 1, 0, 0);
p2 = cubic (dy, 0, 0, 1, 0);
p3 = cubic (dy, 0, 0, 0, 1);
for (x = 0; x < width * bytes; x++)
accum[x] = (p0 * src[0][x] + p1 * src[1][x] +
p2 * src[2][x] + p3 * src[3][x]);
}
break;
case GIMP_INTERPOLATION_LINEAR:
{
gdouble idy = (y * y_rat - 0.5) - new_y;
gdouble dy = 1.0 - idy;
for (x = 0; x < width * bytes; x++)
accum[x] = dy * src[1][x] + idy * src[2][x];
}
break;
case GIMP_INTERPOLATION_NONE:
g_assert_not_reached ();
break;
}
}
else /* height == orig_height */
{
get_scaled_row (&src[0], y, width, srcPR, row,
src_tmp,
interpolation);
memcpy (accum, src[3], sizeof (gdouble) * width * bytes);
}
if (pixel_region_has_alpha (srcPR))
{
/* unmultiply the alpha */
gdouble inv_alpha;
gdouble *p = accum;
gint alpha = bytes - 1;
gint result;
guchar *d = dest;
for (x = 0; x < width; x++)
{
if (p[alpha] > 0.001)
{
inv_alpha = 255.0 / p[alpha];
for (b = 0; b < alpha; b++)
{
result = RINT (inv_alpha * p[b]);
if (result < 0)
d[b] = 0;
else if (result > 255)
d[b] = 255;
else
d[b] = result;
}
result = RINT (p[alpha]);
if (result > 255)
d[alpha] = 255;
else
d[alpha] = result;
}
else /* alpha <= 0 */
for (b = 0; b <= alpha; b++)
d[b] = 0;
d += bytes;
p += bytes;
}
}
else
{
gint w = width * bytes;
for (x = 0; x < w; x++)
{
if (accum[x] < 0.0)
dest[x] = 0;
else if (accum[x] > 255.0)
dest[x] = 255;
else
dest[x] = RINT (accum[x]);
}
}
pixel_region_set_row (destPR, 0, y, width, dest);
}
/* free up temporary arrays */
g_free (accum);
for (i = 0; i < 4; i++)
g_free (src[i]);
g_free (src_tmp);
g_free (dest);
row -= 2 * bytes;
g_free (row);
}
void
subsample_region (PixelRegion *srcPR,
PixelRegion *destPR,
gint subsample)
{
guchar *src, *s;
guchar *dest, *d;
gdouble *row, *r;
gint destwidth;
gint src_row, src_col;
gint bytes, b;
gint width, height;
gint orig_width, orig_height;
gdouble x_rat, y_rat;
gdouble x_cum, y_cum;
gdouble x_last, y_last;
gdouble * x_frac, y_frac, tot_frac;
gint i, j;
gint frac;
gint advance_dest;
orig_width = srcPR->w / subsample;
orig_height = srcPR->h / subsample;
width = destPR->w;
height = destPR->h;
#if 0
fprintf(stderr, "subsample_region: (%d x %d) -> (%d x %d)\n",
orig_width, orig_height, width, height);
#endif
/* Some calculations... */
bytes = destPR->bytes;
destwidth = destPR->rowstride;
/* the data pointers... */
src = (guchar *) g_malloc (orig_width * bytes);
dest = destPR->data;
/* find the ratios of old x to new x and old y to new y */
x_rat = (gdouble) orig_width / (gdouble) width;
y_rat = (gdouble) orig_height / (gdouble) height;
/* allocate an array to help with the calculations */
row = g_new (gdouble, width * bytes);
x_frac = g_new (gdouble, width + orig_width);
/* initialize the pre-calculated pixel fraction array */
src_col = 0;
x_cum = (gdouble) src_col;
x_last = x_cum;
for (i = 0; i < width + orig_width; i++)
{
if (x_cum + x_rat <= (src_col + 1 + EPSILON))
{
x_cum += x_rat;
x_frac[i] = x_cum - x_last;
}
else
{
src_col ++;
x_frac[i] = src_col - x_last;
}
x_last += x_frac[i];
}
/* clear the "row" array */
memset (row, 0, sizeof (gdouble) * width * bytes);
/* counters... */
src_row = 0;
y_cum = (gdouble) src_row;
y_last = y_cum;
pixel_region_get_row (srcPR, 0, src_row * subsample, orig_width * subsample, src, subsample);
/* Scale the selected region */
for (i = 0; i < height; )
{
src_col = 0;
x_cum = (gdouble) src_col;
/* determine the fraction of the src pixel we are using for y */
if (y_cum + y_rat <= (src_row + 1 + EPSILON))
{
y_cum += y_rat;
y_frac = y_cum - y_last;
advance_dest = TRUE;
}
else
{
src_row ++;
y_frac = src_row - y_last;
advance_dest = FALSE;
}
y_last += y_frac;
s = src;
r = row;
frac = 0;
j = width;
while (j)
{
tot_frac = x_frac[frac++] * y_frac;
for (b = 0; b < bytes; b++)
r[b] += s[b] * tot_frac;
/* increment the destination */
if (x_cum + x_rat <= (src_col + 1 + EPSILON))
{
r += bytes;
x_cum += x_rat;
j--;
}
/* increment the source */
else
{
s += bytes;
src_col++;
}
}
if (advance_dest)
{
tot_frac = 1.0 / (x_rat * y_rat);
/* copy "row" to "dest" */
d = dest;
r = row;
j = width;
while (j--)
{
b = bytes;
while (b--)
*d++ = (guchar) (*r++ * tot_frac + 0.5);
}
dest += destwidth;
/* clear the "row" array */
memset (row, 0, sizeof (gdouble) * destwidth);
i++;
}
else
pixel_region_get_row (srcPR, 0, src_row * subsample, orig_width * subsample, src, subsample);
}
/* free up temporary arrays */
g_free (row);
g_free (x_frac);
g_free (src);
}
gfloat
shapeburst_region (PixelRegion *srcPR,
PixelRegion *distPR)
{
Tile *tile;
guchar *tile_data;
gfloat max_iterations;
gfloat *distp_cur;
gfloat *distp_prev;
gfloat *memory;
gfloat *tmp;
gfloat min_prev;
gfloat float_tmp;
gint min;
gint min_left;
gint length;
gint i, j, k;
gint src;
gint fraction;
gint prev_frac;
gint x, y;
gint end;
gint boundary;
gint inc;
src = 0;
max_iterations = 0.0;
length = distPR->w + 1;
memory = g_new (gfloat, length * 2);
distp_prev = memory;
for (i = 0; i < length; i++)
distp_prev[i] = 0.0;
distp_prev += 1;
distp_cur = distp_prev + length;
for (i = 0; i < srcPR->h; i++)
{
/* set the current dist row to 0's */
memset(distp_cur - 1, 0, sizeof (gfloat) * (length - 1));
for (j = 0; j < srcPR->w; j++)
{
min_prev = MIN (distp_cur[j-1], distp_prev[j]);
min_left = MIN ((srcPR->w - j - 1), (srcPR->h - i - 1));
min = (int) MIN (min_left, min_prev);
fraction = 255;
/* This might need to be changed to 0 instead of k = (min) ? (min - 1) : 0 */
for (k = (min) ? (min - 1) : 0; k <= min; k++)
{
x = j;
y = i + k;
end = y - k;
while (y >= end)
{
tile = tile_manager_get_tile (srcPR->tiles,
x, y, TRUE, FALSE);
tile_data = tile_data_pointer (tile,
x % TILE_WIDTH,
y % TILE_HEIGHT);
boundary = MIN ((y % TILE_HEIGHT),
(tile_ewidth (tile) - (x % TILE_WIDTH) - 1));
boundary = MIN (boundary, (y - end)) + 1;
inc = 1 - tile_ewidth (tile);
while (boundary--)
{
src = *tile_data;
if (src == 0)
{
min = k;
y = -1;
break;
}
if (src < fraction)
fraction = src;
x++;
y--;
tile_data += inc;
}
tile_release (tile, FALSE);
}
}
if (src != 0)
{
/* If min_left != min_prev use the previous fraction
* if it is less than the one found
*/
if (min_left != min)
{
prev_frac = (int) (255 * (min_prev - min));
if (prev_frac == 255)
prev_frac = 0;
fraction = MIN (fraction, prev_frac);
}
min++;
}
float_tmp = distp_cur[j] = min + fraction / 256.0;
if (float_tmp > max_iterations)
max_iterations = float_tmp;
}
/* set the dist row */
pixel_region_set_row (distPR, distPR->x, distPR->y + i, distPR->w, (guchar *) distp_cur);
/* swap pointers around */
tmp = distp_prev;
distp_prev = distp_cur;
distp_cur = tmp;
}
g_free (memory);
return max_iterations;
}
static void
compute_border (gint16 *circ,
guint16 xradius,
guint16 yradius)
{
gint32 i;
gint32 diameter = xradius * 2 + 1;
gdouble tmp;
for (i = 0; i < diameter; i++)
{
if (i > xradius)
tmp = (i - xradius) - 0.5;
else if (i < xradius)
tmp = (xradius - i) - 0.5;
else
tmp = 0.0;
circ[i] = RINT (yradius / (gdouble) xradius *
sqrt (xradius * xradius - tmp * tmp));
}
}
void
fatten_region (PixelRegion *src,
gint16 xradius,
gint16 yradius)
{
/*
Any bugs in this fuction are probably also in thin_region
Blame all bugs in this function on jaycox@gimp.org
*/
register gint32 i, j, x, y;
guchar **buf; /* caches the region's pixel data */
guchar *out; /* holds the new scan line we are computing */
guchar **max; /* caches the largest values for each column */
gint16 *circ; /* holds the y coords of the filter's mask */
gint16 last_max, last_index;
guchar *buffer;
if (xradius <= 0 || yradius <= 0)
return;
max = g_new (guchar *, src->w + 2 * xradius);
buf = g_new (guchar *, yradius + 1);
for (i = 0; i < yradius + 1; i++)
{
buf[i] = g_new (guchar, src->w);
}
buffer = g_new (guchar, (src->w + 2 * xradius) * (yradius + 1));
for (i = 0; i < src->w + 2 * xradius; i++)
{
if (i < xradius)
max[i] = buffer;
else if (i < src->w + xradius)
max[i] = &buffer[(yradius + 1) * (i - xradius)];
else
max[i] = &buffer[(yradius + 1) * (src->w + xradius - 1)];
for (j = 0; j < xradius + 1; j++)
max[i][j] = 0;
}
/* offset the max pointer by xradius so the range of the array
is [-xradius] to [src->w + xradius] */
max += xradius;
out = g_new (guchar, src->w);
circ = g_new (gint16, 2 * xradius + 1);
compute_border (circ, xradius, yradius);
/* offset the circ pointer by xradius so the range of the array
is [-xradius] to [xradius] */
circ += xradius;
memset (buf[0], 0, src->w);
for (i = 0; i < yradius && i < src->h; i++) /* load top of image */
pixel_region_get_row (src, src->x, src->y + i, src->w, buf[i + 1], 1);
for (x = 0; x < src->w; x++) /* set up max for top of image */
{
max[x][0] = 0; /* buf[0][x] is always 0 */
max[x][1] = buf[1][x]; /* MAX (buf[1][x], max[x][0]) always = buf[1][x]*/
for (j = 2; j < yradius + 1; j++)
max[x][j] = MAX(buf[j][x], max[x][j-1]);
}
for (y = 0; y < src->h; y++)
{
rotate_pointers (buf, yradius + 1);
if (y < src->h - (yradius))
pixel_region_get_row (src, src->x, src->y + y + yradius, src->w,
buf[yradius], 1);
else
memset (buf[yradius], 0, src->w);
for (x = 0; x < src->w; x++) /* update max array */
{
for (i = yradius; i > 0; i--)
{
max[x][i] = MAX (MAX (max[x][i - 1], buf[i - 1][x]), buf[i][x]);
}
max[x][0] = buf[0][x];
}
last_max = max[0][circ[-1]];
last_index = 1;
for (x = 0; x < src->w; x++) /* render scan line */
{
last_index--;
if (last_index >= 0)
{
if (last_max == 255)
out[x] = 255;
else
{
last_max = 0;
for (i = xradius; i >= 0; i--)
if (last_max < max[x + i][circ[i]])
{
last_max = max[x + i][circ[i]];
last_index = i;
}
out[x] = last_max;
}
}
else
{
last_index = xradius;
last_max = max[x + xradius][circ[xradius]];
for (i = xradius - 1; i >= -xradius; i--)
if (last_max < max[x + i][circ[i]])
{
last_max = max[x + i][circ[i]];
last_index = i;
}
out[x] = last_max;
}
}
pixel_region_set_row (src, src->x, src->y + y, src->w, out);
}
/* undo the offsets to the pointers so we can free the malloced memmory */
circ -= xradius;
max -= xradius;
g_free (circ);
g_free (buffer);
g_free (max);
for (i = 0; i < yradius + 1; i++)
g_free (buf[i]);
g_free (buf);
g_free (out);
}
void
thin_region (PixelRegion *src,
gint16 xradius,
gint16 yradius,
gint edge_lock)
{
/*
pretty much the same as fatten_region only different
blame all bugs in this function on jaycox@gimp.org
*/
/* If edge_lock is true we assume that pixels outside the region
we are passed are identical to the edge pixels.
If edge_lock is false, we assume that pixels outside the region are 0
*/
register gint32 i, j, x, y;
guchar **buf; /* caches the the region's pixels */
guchar *out; /* holds the new scan line we are computing */
guchar **max; /* caches the smallest values for each column */
gint16 *circ; /* holds the y coords of the filter's mask */
gint16 last_max, last_index;
guchar *buffer;
gint buffer_size;
if (xradius <= 0 || yradius <= 0)
return;
max = g_new (guchar *, src->w + 2 * xradius);
buf = g_new (guchar *, yradius + 1);
for (i = 0; i < yradius + 1; i++)
{
buf[i] = g_new (guchar, src->w);
}
buffer_size = (src->w + 2 * xradius + 1) * (yradius + 1);
buffer = g_new (guchar, buffer_size);
if (edge_lock)
memset(buffer, 255, buffer_size);
else
memset(buffer, 0, buffer_size);
for (i = 0; i < src->w + 2 * xradius; i++)
{
if (i < xradius)
if (edge_lock)
max[i] = buffer;
else
max[i] = &buffer[(yradius + 1) * (src->w + xradius)];
else if (i < src->w + xradius)
max[i] = &buffer[(yradius + 1) * (i - xradius)];
else
if (edge_lock)
max[i] = &buffer[(yradius + 1) * (src->w + xradius - 1)];
else
max[i] = &buffer[(yradius + 1) * (src->w + xradius)];
}
if (!edge_lock)
for (j = 0 ; j < xradius + 1; j++)
max[0][j] = 0;
/* offset the max pointer by xradius so the range of the array
is [-xradius] to [src->w + xradius] */
max += xradius;
out = g_new (guchar, src->w);
circ = g_new (gint16, 2 * xradius + 1);
compute_border(circ, xradius, yradius);
/* offset the circ pointer by xradius so the range of the array
is [-xradius] to [xradius] */
circ += xradius;
for (i = 0; i < yradius && i < src->h; i++) /* load top of image */
pixel_region_get_row (src, src->x, src->y + i, src->w, buf[i + 1], 1);
if (edge_lock)
memcpy (buf[0], buf[1], src->w);
else
memset (buf[0], 0, src->w);
for (x = 0; x < src->w; x++) /* set up max for top of image */
{
max[x][0] = buf[0][x];
for (j = 1; j < yradius + 1; j++)
max[x][j] = MIN(buf[j][x], max[x][j-1]);
}
for (y = 0; y < src->h; y++)
{
rotate_pointers (buf, yradius + 1);
if (y < src->h - yradius)
pixel_region_get_row (src, src->x, src->y + y + yradius, src->w,
buf[yradius], 1);
else if (edge_lock)
memcpy (buf[yradius], buf[yradius - 1], src->w);
else
memset (buf[yradius], 0, src->w);
for (x = 0 ; x < src->w; x++) /* update max array */
{
for (i = yradius; i > 0; i--)
{
max[x][i] = MIN (MIN (max[x][i - 1], buf[i - 1][x]), buf[i][x]);
}
max[x][0] = buf[0][x];
}
last_max = max[0][circ[-1]];
last_index = 0;
for (x = 0 ; x < src->w; x++) /* render scan line */
{
last_index--;
if (last_index >= 0)
{
if (last_max == 0)
out[x] = 0;
else
{
last_max = 255;
for (i = xradius; i >= 0; i--)
if (last_max > max[x + i][circ[i]])
{
last_max = max[x + i][circ[i]];
last_index = i;
}
out[x] = last_max;
}
}
else
{
last_index = xradius;
last_max = max[x + xradius][circ[xradius]];
for (i = xradius - 1; i >= -xradius; i--)
if (last_max > max[x + i][circ[i]])
{
last_max = max[x + i][circ[i]];
last_index = i;
}
out[x] = last_max;
}
}
pixel_region_set_row (src, src->x, src->y + y, src->w, out);
}
/* undo the offsets to the pointers so we can free the malloced memmory */
circ -= xradius;
max -= xradius;
/* free the memmory */
g_free (circ);
g_free (buffer);
g_free (max);
for (i = 0; i < yradius + 1; i++)
g_free (buf[i]);
g_free (buf);
g_free (out);
}
static void
compute_transition (guchar *transition,
guchar **buf,
gint32 width)
{
register gint32 x = 0;
if (width == 1)
{
if (buf[1][x] > 127 && (buf[0][x] < 128 || buf[2][x] < 128))
transition[x] = 255;
else
transition[x] = 0;
return;
}
if (buf[1][x] > 127)
{
if ( buf[0][x] < 128 || buf[0][x + 1] < 128 ||
buf[1][x + 1] < 128 ||
buf[2][x] < 128 || buf[2][x + 1] < 128 )
transition[x] = 255;
else
transition[x] = 0;
}
else
transition[x] = 0;
for (x = 1; x < width - 1; x++)
{
if (buf[1][x] >= 128)
{
if (buf[0][x - 1] < 128 || buf[0][x] < 128 || buf[0][x + 1] < 128 ||
buf[1][x - 1] < 128 || buf[1][x + 1] < 128 ||
buf[2][x - 1] < 128 || buf[2][x] < 128 || buf[2][x + 1] < 128)
transition[x] = 255;
else
transition[x] = 0;
}
else
transition[x] = 0;
}
if (buf[1][x] >= 128)
{
if ( buf[0][x - 1] < 128 || buf[0][x] < 128 ||
buf[1][x - 1] < 128 ||
buf[2][x - 1] < 128 || buf[2][x] < 128)
transition[x] = 255;
else
transition[x] = 0;
}
else
transition[x] = 0;
}
void
border_region (PixelRegion *src,
gint16 xradius,
gint16 yradius)
{
/*
This function has no bugs, but if you imagine some you can
blame them on jaycox@gimp.org
*/
register gint32 i, j, x, y;
guchar **buf, *out;
gint16 *max;
guchar **density;
guchar **transition;
guchar last_max;
gint16 last_index;
if (xradius < 0 || yradius < 0)
{
g_warning ("border_region: negative radius specified.");
return;
}
if (xradius == 0 || yradius == 0)
{
guchar color[] = "\0\0\0\0";
color_region (src, color);
return;
}
if (xradius == 1 && yradius == 1) /* optimize this case specifically */
{
guchar *transition;
guchar *source[3];
for (i = 0; i < 3; i++)
source[i] = g_new (guchar, src->w);
transition = g_new (guchar, src->w);
pixel_region_get_row (src, src->x, src->y + 0, src->w, source[0], 1);
memcpy (source[1], source[0], src->w);
if (src->h > 1)
pixel_region_get_row (src, src->x, src->y + 1, src->w, source[2], 1);
else
memcpy (source[2], source[1], src->w);
compute_transition (transition, source, src->w);
pixel_region_set_row (src, src->x, src->y , src->w, transition);
for (y = 1; y < src->h; y++)
{
rotate_pointers (source, 3);
if (y + 1 < src->h)
pixel_region_get_row (src, src->x, src->y + y + 1, src->w,
source[2], 1);
else
memcpy(source[2], source[1], src->w);
compute_transition (transition, source, src->w);
pixel_region_set_row (src, src->x, src->y + y, src->w, transition);
}
for (i = 0; i < 3; i++)
g_free (source[i]);
g_free (transition);
return;
}
max = g_new (gint16, src->w + 2 * xradius);
for (i = 0; i < (src->w + 2 * xradius); i++)
max[i] = yradius + 2;
max += xradius;
buf = g_new (guchar *, 3);
for (i = 0; i < 3; i++)
{
buf[i] = g_new (guchar, src->w);
}
transition = g_new (guchar *, yradius + 1);
for (i = 0; i < yradius + 1; i++)
{
transition[i] = g_new (guchar, src->w + 2 * xradius);
memset(transition[i], 0, src->w + 2 * xradius);
transition[i] += xradius;
}
out = g_new (guchar, src->w);
density = g_new (guchar *, 2 * xradius + 1);
density += xradius;
for (x = 0; x < (xradius + 1); x++) /* allocate density[][] */
{
density[ x] = g_new (guchar, 2 * yradius + 1);
density[ x] += yradius;
density[-x] = density[x];
}
for (x = 0; x < (xradius + 1); x++) /* compute density[][] */
{
register gdouble tmpx, tmpy, dist;
guchar a;
if (x > 0)
tmpx = x - 0.5;
else if (x < 0)
tmpx = x + 0.5;
else
tmpx = 0.0;
for (y = 0; y < (yradius + 1); y++)
{
if (y > 0)
tmpy = y - 0.5;
else if (y < 0)
tmpy = y + 0.5;
else
tmpy = 0.0;
dist = ((tmpy * tmpy) / (yradius * yradius) +
(tmpx * tmpx) / (xradius * xradius));
if (dist < 1.0)
a = 255 * (1.0 - sqrt (dist));
else
a = 0;
density[ x][ y] = a;
density[ x][-y] = a;
density[-x][ y] = a;
density[-x][-y] = a;
}
}
pixel_region_get_row (src, src->x, src->y + 0, src->w, buf[0], 1);
memcpy (buf[1], buf[0], src->w);
if (src->h > 1)
pixel_region_get_row (src, src->x, src->y + 1, src->w, buf[2], 1);
else
memcpy (buf[2], buf[1], src->w);
compute_transition (transition[1], buf, src->w);
for (y = 1; y < yradius && y + 1 < src->h; y++) /* set up top of image */
{
rotate_pointers (buf, 3);
pixel_region_get_row (src, src->x, src->y + y + 1, src->w, buf[2], 1);
compute_transition (transition[y + 1], buf, src->w);
}
for (x = 0; x < src->w; x++) /* set up max[] for top of image */
{
max[x] = -(yradius + 7);
for (j = 1; j < yradius + 1; j++)
if (transition[j][x])
{
max[x] = j;
break;
}
}
for (y = 0; y < src->h; y++) /* main calculation loop */
{
rotate_pointers (buf, 3);
rotate_pointers (transition, yradius + 1);
if (y < src->h - (yradius + 1))
{
pixel_region_get_row (src, src->x, src->y + y + yradius + 1, src->w,
buf[2], 1);
compute_transition (transition[yradius], buf, src->w);
}
else
memcpy (transition[yradius], transition[yradius - 1], src->w);
for (x = 0; x < src->w; x++) /* update max array */
{
if (max[x] < 1)
{
if (max[x] <= -yradius)
{
if (transition[yradius][x])
max[x] = yradius;
else
max[x]--;
}
else
if (transition[-max[x]][x])
max[x] = -max[x];
else if (transition[-max[x] + 1][x])
max[x] = -max[x] + 1;
else
max[x]--;
}
else
max[x]--;
if (max[x] < -yradius - 1)
max[x] = -yradius - 1;
}
last_max = max[0][density[-1]];
last_index = 1;
for (x = 0 ; x < src->w; x++) /* render scan line */
{
last_index--;
if (last_index >= 0)
{
last_max = 0;
for (i = xradius; i >= 0; i--)
if (max[x + i] <= yradius && max[x + i] >= -yradius &&
density[i][max[x+i]] > last_max)
{
last_max = density[i][max[x + i]];
last_index = i;
}
out[x] = last_max;
}
else
{
last_max = 0;
for (i = xradius; i >= -xradius; i--)
if (max[x + i] <= yradius && max[x + i] >= -yradius &&
density[i][max[x + i]] > last_max)
{
last_max = density[i][max[x + i]];
last_index = i;
}
out[x] = last_max;
}
if (last_max == 0)
{
for (i = x + 1; i < src->w; i++)
{
if (max[i] >= -yradius)
break;
}
if (i - x > xradius)
{
for (; x < i - xradius; x++)
out[x] = 0;
x--;
}
last_index = xradius;
}
}
pixel_region_set_row (src, src->x, src->y + y, src->w, out);
}
g_free (out);
for (i = 0; i < 3; i++)
g_free (buf[i]);
g_free (buf);
max -= xradius;
g_free (max);
for (i = 0; i < yradius + 1; i++)
{
transition[i] -= xradius;
g_free (transition[i]);
}
g_free (transition);
for (i = 0; i < xradius + 1 ; i++)
{
density[i]-= yradius;
g_free (density[i]);
}
density -= xradius;
g_free (density);
}
void
swap_region (PixelRegion *src,
PixelRegion *dest)
{
gint h;
gint length;
guchar * s, * d;
void * pr;
for (pr = pixel_regions_register (2, src, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
s = src->data;
h = src->h;
d = dest->data;
length = src->w * src->bytes;
while (h --)
{
swap_pixels (s, d, length);
s += src->rowstride;
d += dest->rowstride;
}
}
}
static void
apply_mask_to_sub_region (gint *opacityp,
PixelRegion *src,
PixelRegion *mask)
{
gint h;
guchar *s;
guchar *m;
gint opacity = *opacityp;
s = src->data;
m = mask->data;
h = src->h;
while (h --)
{
apply_mask_to_alpha_channel (s, m, opacity, src->w, src->bytes);
s += src->rowstride;
m += mask->rowstride;
}
}
void
apply_mask_to_region (PixelRegion *src,
PixelRegion *mask,
guint opacity)
{
pixel_regions_process_parallel ((p_func)apply_mask_to_sub_region,
&opacity, 2, src, mask);
}
static void
combine_mask_and_sub_region (gint *opacityp,
PixelRegion *src,
PixelRegion *mask)
{
gint h;
guchar *s;
guchar *m;
gint opacity = *opacityp;
s = src->data;
m = mask->data;
h = src->h;
while (h --)
{
combine_mask_and_alpha_channel (s, m, opacity, src->w, src->bytes);
s += src->rowstride;
m += mask->rowstride;
}
}
void
combine_mask_and_region (PixelRegion *src,
PixelRegion *mask,
guint opacity)
{
pixel_regions_process_parallel ((p_func)combine_mask_and_sub_region,
&opacity, 2, src, mask);
}
void
copy_gray_to_region (PixelRegion *src,
PixelRegion *dest)
{
gint h;
guchar *s;
guchar *d;
void *pr;
for (pr = pixel_regions_register (2, src, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
s = src->data;
d = dest->data;
h = src->h;
while (h --)
{
copy_gray_to_inten_a_pixels (s, d, src->w, dest->bytes);
s += src->rowstride;
d += dest->rowstride;
}
}
}
void
copy_component (PixelRegion *src,
PixelRegion *dest,
guint pixel)
{
gint h;
guchar *s;
guchar *d;
void *pr;
for (pr = pixel_regions_register (2, src, dest);
pr != NULL;
pr = pixel_regions_process (pr))
{
s = src->data;
d = dest->data;
h = src->h;
while (h --)
{
component_pixels (s, d, src->w, src->bytes, pixel);
s += src->rowstride;
d += dest->rowstride;
}
}
}
struct initial_regions_struct
{
guint opacity;
GimpLayerModeEffects mode;
gboolean *affect;
InitialMode type;
guchar *data;
};
void
initial_sub_region (struct initial_regions_struct *st,
PixelRegion *src,
PixelRegion *dest,
PixelRegion *mask)
{
gint h;
guchar *s, *d, *m;
guchar *buf;
guchar *data;
guint opacity;
GimpLayerModeEffects mode;
gboolean *affect;
InitialMode type;
/* use src->bytes + 1 since DISSOLVE always needs a buffer with alpha */
buf = g_alloca (MAX (src->w * (src->bytes + 1),
dest->w * dest->bytes));
data = st->data;
opacity = st->opacity;
mode = st->mode;
affect = st->affect;
type = st->type;
s = src->data;
d = dest->data;
m = mask ? mask->data : NULL;
for (h = 0; h < src->h; h++)
{
/* based on the type of the initial image... */
switch (type)
{
case INITIAL_CHANNEL_MASK:
case INITIAL_CHANNEL_SELECTION:
initial_channel_pixels (s, d, src->w, dest->bytes);
break;
case INITIAL_INDEXED:
initial_indexed_pixels (s, d, data, src->w);
break;
case INITIAL_INDEXED_ALPHA:
initial_indexed_a_pixels (s, d, m, &no_mask, data, opacity, src->w);
break;
case INITIAL_INTENSITY:
if (mode == GIMP_DISSOLVE_MODE)
{
if (gimp_composite_options.bits & GIMP_COMPOSITE_OPTION_USE)
{
GimpCompositeContext ctx;
ctx.A = NULL;
ctx.pixelformat_A = GIMP_PIXELFORMAT_RGBA8;
ctx.B = s;
ctx.pixelformat_B = (src->bytes == 1 ? GIMP_PIXELFORMAT_V8
: src->bytes == 2 ? GIMP_PIXELFORMAT_VA8
: src->bytes == 3 ? GIMP_PIXELFORMAT_RGB8
: src->bytes == 4 ? GIMP_PIXELFORMAT_RGBA8
: GIMP_PIXELFORMAT_ANY);
ctx.D = buf;
ctx.pixelformat_D = ctx.pixelformat_B;
ctx.M = m;
ctx.n_pixels = src->w;
ctx.op = GIMP_COMPOSITE_DISSOLVE;
ctx.dissolve.x = src->x;
ctx.dissolve.y = src->y + h;
ctx.dissolve.opacity = opacity;
gimp_composite_dispatch (&ctx);
}
else
{
dissolve_pixels (s, m, buf, src->x, src->y + h,
opacity, src->w,
src->bytes, src->bytes + 1,
FALSE);
}
initial_inten_a_pixels (buf, d, NULL, OPAQUE_OPACITY, affect,
src->w, src->bytes + 1);
}
else
{
initial_inten_pixels (s, d, m, &no_mask, opacity, affect,
src->w, src->bytes);
}
break;
case INITIAL_INTENSITY_ALPHA:
if (mode == GIMP_DISSOLVE_MODE)
{
if (gimp_composite_options.bits & GIMP_COMPOSITE_OPTION_USE)
{
GimpCompositeContext ctx;
ctx.A = NULL;
ctx.pixelformat_A = GIMP_PIXELFORMAT_RGBA8;
ctx.B = s;
ctx.pixelformat_B = (src->bytes == 1 ? GIMP_PIXELFORMAT_V8
: src->bytes == 2 ? GIMP_PIXELFORMAT_VA8
: src->bytes == 3 ? GIMP_PIXELFORMAT_RGB8
: src->bytes == 4 ? GIMP_PIXELFORMAT_RGBA8
: GIMP_PIXELFORMAT_ANY);
ctx.D = buf;
ctx.pixelformat_D = ctx.pixelformat_B;
ctx.M = m;
ctx.n_pixels = src->w;
ctx.op = GIMP_COMPOSITE_DISSOLVE;
ctx.dissolve.x = src->x;
ctx.dissolve.y = src->y + h;
ctx.dissolve.opacity = opacity;
gimp_composite_dispatch (&ctx);
}
else
{
dissolve_pixels (s, m, buf, src->x, src->y + h,
opacity, src->w,
src->bytes, src->bytes,
TRUE);
}
initial_inten_a_pixels (buf, d, NULL, OPAQUE_OPACITY, affect,
src->w, src->bytes);
}
else
{
initial_inten_a_pixels (s, d, m, opacity, affect, src->w, src->bytes);
}
break;
}
s += src->rowstride;
d += dest->rowstride;
if (mask)
m += mask->rowstride;
}
}
void
initial_region (PixelRegion *src,
PixelRegion *dest,
PixelRegion *mask,
guchar *data,
gint opacity,
GimpLayerModeEffects mode,
gboolean *affect,
InitialMode type)
{
struct initial_regions_struct st;
st.opacity = opacity;
st.mode = mode;
st.affect = affect;
st.type = type;
st.data = data;
pixel_regions_process_parallel ((p_func)initial_sub_region, &st, 3,
src, dest, mask);
}
struct combine_regions_struct
{
guint opacity;
GimpLayerModeEffects mode;
gboolean *affect;
CombinationMode type;
guchar *data;
gboolean opacity_quickskip_possible;
gboolean transparency_quickskip_possible;
};
static inline CombinationMode
apply_indexed_layer_mode (guchar *src1,
guchar *src2,
guchar **dest,
GimpLayerModeEffects mode,
CombinationMode cmode)
{
/* assumes we're applying src2 TO src1 */
switch (mode)
{
case GIMP_REPLACE_MODE:
*dest = src2;
cmode = REPLACE_INDEXED;
break;
case GIMP_BEHIND_MODE:
*dest = src2;
if (cmode == COMBINE_INDEXED_A_INDEXED_A)
cmode = BEHIND_INDEXED;
else
cmode = NO_COMBINATION;
break;
case GIMP_ERASE_MODE:
*dest = src2;
/* If both sources have alpha channels, call erase function.
* Otherwise, just combine in the normal manner
*/
cmode = (cmode == COMBINE_INDEXED_A_INDEXED_A) ? ERASE_INDEXED : cmode;
break;
default:
break;
}
return cmode;
}
void
combine_sub_region (struct combine_regions_struct *st,
PixelRegion *src1,
PixelRegion *src2,
PixelRegion *dest,
PixelRegion *mask)
{
guchar *data;
guint opacity;
guint layer_mode_opacity;
guchar *layer_mode_mask;
GimpLayerModeEffects mode;
gboolean *affect;
guint h;
CombinationMode combine = NO_COMBINATION;
CombinationMode type;
guint mode_affect = 0;
guchar *s, *s1, *s2;
guchar *d, *m;
guchar *buf;
gboolean opacity_quickskip_possible;
gboolean transparency_quickskip_possible;
TileRowHint hint;
/* use src2->bytes + 1 since DISSOLVE always needs a buffer with alpha */
buf = g_alloca (MAX (MAX (src1->w * src1->bytes,
src2->w * (src2->bytes + 1)),
dest->w * dest->bytes));
opacity = st->opacity;
mode = st->mode;
affect = st->affect;
type = st->type;
data = st->data;
opacity_quickskip_possible = (st->opacity_quickskip_possible &&
src2->tiles);
transparency_quickskip_possible = (st->transparency_quickskip_possible &&
src2->tiles);
s1 = src1->data;
s2 = src2->data;
d = dest->data;
m = mask ? mask->data : NULL;
if (transparency_quickskip_possible || opacity_quickskip_possible)
{
#ifdef HINTS_SANITY
if (src1->h != src2->h)
g_error("HEIGHTS SUCK!!");
if (src1->offy != dest->offy)
g_error("SRC1 OFFSET != DEST OFFSET");
#endif
update_tile_rowhints (src2->curtile,
src2->offy, src2->offy + (src1->h - 1));
}
/* else it's probably a brush-composite */
/* use separate variables for the combining opacity and the opacity
* the layer mode is applied with since DISSLOVE_MODE "consumes"
* all opacity and wants to be applied OPAQUE
*/
layer_mode_opacity = opacity;
layer_mode_mask = m;
if (mode == GIMP_DISSOLVE_MODE)
{
opacity = OPAQUE_OPACITY;
m = NULL;
}
for (h = 0; h < src1->h; h++)
{
hint = TILEROWHINT_UNDEFINED;
if (transparency_quickskip_possible)
{
hint = tile_get_rowhint (src2->curtile, (src2->offy + h));
if (hint == TILEROWHINT_TRANSPARENT)
{
goto next_row;
}
}
else
{
if (opacity_quickskip_possible)
{
hint = tile_get_rowhint (src2->curtile, (src2->offy + h));
}
}
s = buf;
/* apply the paint mode based on the combination type & mode */
switch (type)
{
case COMBINE_INTEN_A_INDEXED_A:
case COMBINE_INTEN_A_CHANNEL_MASK:
case COMBINE_INTEN_A_CHANNEL_SELECTION:
combine = type;
break;
case COMBINE_INDEXED_INDEXED:
case COMBINE_INDEXED_INDEXED_A:
case COMBINE_INDEXED_A_INDEXED_A:
/* Now, apply the paint mode--for indexed images */
combine = apply_indexed_layer_mode (s1, s2, &s, mode, type);
break;
case COMBINE_INTEN_INTEN_A:
case COMBINE_INTEN_A_INTEN:
case COMBINE_INTEN_INTEN:
case COMBINE_INTEN_A_INTEN_A:
{
/* Now, apply the paint mode */
struct apply_layer_mode_struct alms;
alms.src1 = s1;
alms.src2 = s2;
alms.mask = layer_mode_mask;
alms.dest = &s;
alms.x = src1->x;
alms.y = src1->y + h;
alms.opacity = layer_mode_opacity;
alms.combine = combine;
alms.length = src1->w;
alms.bytes1 = src1->bytes;
alms.bytes2 = src2->bytes;
if (gimp_composite_options.bits & GIMP_COMPOSITE_OPTION_USE)
{
GimpCompositeContext ctx;
ctx.A = s1;
ctx.pixelformat_A = (src1->bytes == 1 ? GIMP_PIXELFORMAT_V8
: src1->bytes == 2 ? GIMP_PIXELFORMAT_VA8
: src1->bytes == 3 ? GIMP_PIXELFORMAT_RGB8
: src1->bytes == 4 ? GIMP_PIXELFORMAT_RGBA8
: GIMP_PIXELFORMAT_ANY);
ctx.B = s2;
ctx.pixelformat_B = (src2->bytes == 1 ? GIMP_PIXELFORMAT_V8
: src2->bytes == 2 ? GIMP_PIXELFORMAT_VA8
: src2->bytes == 3 ? GIMP_PIXELFORMAT_RGB8
: src2->bytes == 4 ? GIMP_PIXELFORMAT_RGBA8
: GIMP_PIXELFORMAT_ANY);
ctx.D = s;
ctx.pixelformat_D = ctx.pixelformat_A;
ctx.M = layer_mode_mask;
ctx.pixelformat_M = GIMP_PIXELFORMAT_ANY;
ctx.n_pixels = src1->w;
ctx.combine = combine;
ctx.op = mode;
ctx.dissolve.x = src1->x;
ctx.dissolve.y = src1->y + h;
ctx.dissolve.opacity = layer_mode_opacity;
mode_affect = gimp_composite_operation_effects[mode].affect_opacity;
gimp_composite_dispatch (&ctx);
s = ctx.D;
combine = (ctx.combine == NO_COMBINATION) ? type : ctx.combine;
}
else
{
/* Determine whether the alpha channel of the destination
* can be affected by the specified mode. -- This keeps
* consistency with varying opacities.
*/
mode_affect = layer_modes[mode].affect_alpha;
layer_mode_funcs[mode] (&alms);
combine = (alms.combine == NO_COMBINATION ?
type : alms.combine);
}
}
break;
default:
g_warning ("combine_sub_region: unhandled combine-type.");
break;
}
/* based on the type of the initial image... */
switch (combine)
{
case COMBINE_INDEXED_INDEXED:
combine_indexed_and_indexed_pixels (s1, s2, d, m, opacity,
affect, src1->w,
src1->bytes);
break;
case COMBINE_INDEXED_INDEXED_A:
combine_indexed_and_indexed_a_pixels (s1, s2, d, m, opacity,
affect, src1->w,
src1->bytes);
break;
case COMBINE_INDEXED_A_INDEXED_A:
combine_indexed_a_and_indexed_a_pixels (s1, s2, d, m, opacity,
affect, src1->w,
src1->bytes);
break;
case COMBINE_INTEN_A_INDEXED_A:
/* assume the data passed to this procedure is the
* indexed layer's colormap
*/
combine_inten_a_and_indexed_a_pixels (s1, s2, d, m, data, opacity,
src1->w, dest->bytes);
break;
case COMBINE_INTEN_A_CHANNEL_MASK:
/* assume the data passed to this procedure is the
* indexed layer's colormap
*/
combine_inten_a_and_channel_mask_pixels (s1, s2, d, data, opacity,
src1->w, dest->bytes);
break;
case COMBINE_INTEN_A_CHANNEL_SELECTION:
combine_inten_a_and_channel_selection_pixels (s1, s2, d, data,
opacity,
src1->w,
src1->bytes);
break;
case COMBINE_INTEN_INTEN:
if ((hint == TILEROWHINT_OPAQUE) &&
opacity_quickskip_possible)
{
memcpy (d, s, dest->w * dest->bytes);
}
else
combine_inten_and_inten_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case COMBINE_INTEN_INTEN_A:
combine_inten_and_inten_a_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case COMBINE_INTEN_A_INTEN:
combine_inten_a_and_inten_pixels (s1, s, d, m, opacity,
affect, mode_affect, src1->w,
src1->bytes);
break;
case COMBINE_INTEN_A_INTEN_A:
if ((hint == TILEROWHINT_OPAQUE) &&
opacity_quickskip_possible)
{
memcpy (d, s, dest->w * dest->bytes);
}
else
combine_inten_a_and_inten_a_pixels (s1, s, d, m, opacity,
affect, mode_affect,
src1->w, src1->bytes);
break;
case BEHIND_INTEN:
behind_inten_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes,
src2->bytes);
break;
case BEHIND_INDEXED:
behind_indexed_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes,
src2->bytes);
break;
case REPLACE_INTEN:
replace_inten_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes,
src2->bytes);
break;
case REPLACE_INDEXED:
replace_indexed_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes,
src2->bytes);
break;
case ERASE_INTEN:
erase_inten_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case ERASE_INDEXED:
erase_indexed_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case ANTI_ERASE_INTEN:
anti_erase_inten_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case ANTI_ERASE_INDEXED:
anti_erase_indexed_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case COLOR_ERASE_INTEN:
color_erase_inten_pixels (s1, s, d, m, opacity,
affect, src1->w, src1->bytes);
break;
case NO_COMBINATION:
g_warning("NO_COMBINATION");
break;
default:
g_warning("UNKNOWN COMBINATION: %d", combine);
break;
}
next_row:
s1 += src1->rowstride;
s2 += src2->rowstride;
d += dest->rowstride;
if (mask)
{
layer_mode_mask += mask->rowstride;
if (m)
m += mask->rowstride;
}
}
}
void
combine_regions (PixelRegion *src1,
PixelRegion *src2,
PixelRegion *dest,
PixelRegion *mask,
guchar *data,
guint opacity,
GimpLayerModeEffects mode,
gboolean *affect,
CombinationMode type)
{
gboolean has_alpha1, has_alpha2;
guint i;
struct combine_regions_struct st;
/* Determine which sources have alpha channels */
switch (type)
{
case COMBINE_INTEN_INTEN:
case COMBINE_INDEXED_INDEXED:
has_alpha1 = has_alpha2 = FALSE;
break;
case COMBINE_INTEN_A_INTEN:
has_alpha1 = TRUE;
has_alpha2 = FALSE;
break;
case COMBINE_INTEN_INTEN_A:
case COMBINE_INDEXED_INDEXED_A:
has_alpha1 = FALSE;
has_alpha2 = TRUE;
break;
case COMBINE_INTEN_A_INTEN_A:
case COMBINE_INDEXED_A_INDEXED_A:
has_alpha1 = has_alpha2 = TRUE;
break;
default:
has_alpha1 = has_alpha2 = FALSE;
}
st.opacity = opacity;
st.mode = mode;
st.affect = affect;
st.type = type;
st.data = data;
/* cheap and easy when the row of src2 is completely opaque/transparent
and the wind is otherwise blowing in the right direction.
*/
/* First check - we can't do an opacity quickskip if the drawable
has a mask, or non-full opacity, or the layer mode dictates
that we might gain transparency.
*/
st.opacity_quickskip_possible = ((!mask) &&
(opacity == 255) &&
(!layer_modes[mode].decrease_opacity) &&
(layer_modes[mode].affect_alpha &&
has_alpha1 &&
affect[src1->bytes - 1]));
/* Second check - if any single colour channel can't be affected,
we can't use the opacity quickskip.
*/
if (st.opacity_quickskip_possible)
{
for (i = 0; i < src1->bytes - 1; i++)
{
if (!affect[i])
{
st.opacity_quickskip_possible = FALSE;
break;
}
}
}
/* transparency quickskip is only possible if the layer mode
dictates that we cannot possibly gain opacity, or the 'overall'
opacity of the layer is set to zero anyway.
*/
st.transparency_quickskip_possible = ((!layer_modes[mode].increase_opacity)
|| (opacity==0));
/* Start the actual processing.
*/
pixel_regions_process_parallel ((p_func)combine_sub_region, &st, 4,
src1, src2, dest, mask);
}
void
combine_regions_replace (PixelRegion *src1,
PixelRegion *src2,
PixelRegion *dest,
PixelRegion *mask,
guchar *data,
guint opacity,
gboolean *affect,
CombinationMode type)
{
guint h;
guchar *s1;
guchar *s2;
guchar *d;
guchar *m;
gpointer pr;
for (pr = pixel_regions_register (4, src1, src2, dest, mask);
pr != NULL;
pr = pixel_regions_process (pr))
{
s1 = src1->data;
s2 = src2->data;
d = dest->data;
m = mask->data;
for (h = 0; h < src1->h; h++)
{
/* Now, apply the paint mode */
apply_layer_mode_replace (s1, s2, d, m, src1->x, src1->y + h,
opacity, src1->w,
src1->bytes, src2->bytes, affect);
s1 += src1->rowstride;
s2 += src2->rowstride;
d += dest->rowstride;
m += mask->rowstride;
}
}
}
static void
apply_layer_mode_replace (guchar *src1,
guchar *src2,
guchar *dest,
guchar *mask,
gint x,
gint y,
guint opacity,
guint length,
guint bytes1,
guint bytes2,
gboolean *affect)
{
replace_pixels (src1, src2, dest, mask, length, opacity, affect, bytes1, bytes2);
}
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