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Diffstat (limited to 'plug-ins/common/photocopy.c')
| -rw-r--r-- | plug-ins/common/photocopy.c | 935 |
1 files changed, 935 insertions, 0 deletions
diff --git a/plug-ins/common/photocopy.c b/plug-ins/common/photocopy.c new file mode 100644 index 0000000..5a2c7f2 --- /dev/null +++ b/plug-ins/common/photocopy.c @@ -0,0 +1,935 @@ +/* GIMP - The GNU 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 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 <https://www.gnu.org/licenses/>. + */ + +/* Photocopy filter for GIMP for BIPS + * -Spencer Kimball + * + * This filter propagates dark values in an image based on + * each pixel's relative darkness to a neighboring average + * and sets the remaining pixels to white. + */ + +#include "config.h" + +#include <string.h> + +#include <libgimp/gimp.h> +#include <libgimp/gimpui.h> + +#include "libgimp/stdplugins-intl.h" + + +/* Some useful macros */ + +#define PLUG_IN_PROC "plug-in-photocopy" +#define PLUG_IN_BINARY "photocopy" +#define PLUG_IN_ROLE "gimp-photocopy" +#define TILE_CACHE_SIZE 48 +#define GAMMA 1.0 +#define EPSILON 2 + + +typedef struct +{ + gdouble mask_radius; + gdouble sharpness; + gdouble threshold; + gdouble pct_black; + gdouble pct_white; +} PhotocopyVals; + + +/* + * Function prototypes. + */ + +static void query (void); +static void run (const gchar *name, + gint nparams, + const GimpParam *param, + gint *nreturn_vals, + GimpParam **return_vals); + +static void photocopy (GimpDrawable *drawable, + GimpPreview *preview); +static gboolean photocopy_dialog (GimpDrawable *drawable); + +static gdouble compute_ramp (guchar *dest1, + guchar *dest2, + gint length, + gdouble pct_black, + gint under_threshold); + +/* + * Gaussian blur helper functions + */ +static void find_constants (gdouble n_p[], + gdouble n_m[], + gdouble d_p[], + gdouble d_m[], + gdouble bd_p[], + gdouble bd_m[], + gdouble std_dev); +static void transfer_pixels (gdouble *src1, + gdouble *src2, + guchar *dest, + gint jump, + gint width); + +/***** Local vars *****/ + +const GimpPlugInInfo PLUG_IN_INFO = +{ + NULL, /* init */ + NULL, /* quit */ + query, /* query */ + run, /* run */ +}; + +static PhotocopyVals pvals = +{ + 8.0, /* mask_radius */ + 0.8, /* sharpness */ + 0.75, /* threshold */ + 0.2, /* pct_black */ + 0.2 /* pct_white */ +}; + + +/***** Functions *****/ + +MAIN () + +static void +query (void) +{ + static const GimpParamDef args[] = + { + { GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" }, + { GIMP_PDB_IMAGE, "image", "Input image (unused)" }, + { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }, + { GIMP_PDB_FLOAT, "mask-radius", "Photocopy mask radius (radius of pixel neighborhood)" }, + { GIMP_PDB_FLOAT, "sharpness", "Sharpness (detail level) (0.0 - 1.0)" }, + { GIMP_PDB_FLOAT, "pct-black", "Percentage of darkened pixels to set to black (0.0 - 1.0)" }, + { GIMP_PDB_FLOAT, "pct-white", "Percentage of non-darkened pixels left white (0.0 - 1.0)" } + }; + + gchar *help_string = + "Propagates dark values in an image based on " + "each pixel's relative darkness to a neighboring average. The idea behind " + "this filter is to give the look of a photocopied version of the image, " + "with toner transferred based on the relative darkness of a particular " + "region. This is achieved by darkening areas of the image which are " + "measured to be darker than a neighborhood average and setting other " + "pixels to white. In this way, sufficiently large shifts in intensity " + "are darkened to black. The rate at which they are darkened to black is " + "determined by the second pct_black parameter. The mask_radius parameter " + "controls the size of the pixel neighborhood over which the average " + "intensity is computed and then compared to each pixel in the neighborhood " + "to decide whether or not to darken it to black. Large values for " + "mask_radius result in very thick black areas bordering the regions " + "of white and much less detail for black areas everywhere including " + "inside regions of color. Small values result in less toner overall " + "and more detail everywhere. Small values for the pct_black make the " + "blend from the white regions to the black border lines smoother and " + "the toner regions themselves thinner and less noticeable; larger values " + "achieve the opposite effect."; + + gimp_install_procedure (PLUG_IN_PROC, + N_("Simulate color distortion produced by a copy machine"), + help_string, + "Spencer Kimball", + "Bit Specialists, Inc.", + "2001", + N_("_Photocopy (legacy)..."), + "RGB*, GRAY*", + GIMP_PLUGIN, + G_N_ELEMENTS (args), 0, + args, NULL); + + gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Artistic"); +} + +static void +run (const gchar *name, + gint nparams, + const GimpParam *param, + gint *nreturn_vals, + GimpParam **return_vals) +{ + static GimpParam values[2]; + GimpRunMode run_mode; + GimpDrawable *drawable; + GimpPDBStatusType status = GIMP_PDB_SUCCESS; + + run_mode = param[0].data.d_int32; + + /* Get the specified drawable */ + drawable = gimp_drawable_get (param[2].data.d_drawable); + + /* set the tile cache size */ + gimp_tile_cache_ntiles (TILE_CACHE_SIZE); + + *nreturn_vals = 1; + *return_vals = values; + + values[0].type = GIMP_PDB_STATUS; + values[0].data.d_status = status; + + INIT_I18N(); + + switch (run_mode) + { + case GIMP_RUN_INTERACTIVE: + /* Possibly retrieve data */ + gimp_get_data (PLUG_IN_PROC, &pvals); + + /* First acquire information with a dialog */ + if (! photocopy_dialog (drawable)) + return; + break; + + case GIMP_RUN_NONINTERACTIVE: + pvals.mask_radius = param[3].data.d_float; + pvals.sharpness = param[4].data.d_float; + pvals.pct_black = param[5].data.d_float; + pvals.pct_white = param[6].data.d_float; + break; + + case GIMP_RUN_WITH_LAST_VALS: + /* Possibly retrieve data */ + gimp_get_data (PLUG_IN_PROC, &pvals); + break; + + default: + break; + } + + if (status == GIMP_PDB_SUCCESS) + { + /* Make sure that the drawable is RGB or GRAY color */ + if (gimp_drawable_is_rgb (drawable->drawable_id) || + gimp_drawable_is_gray (drawable->drawable_id)) + { + gimp_progress_init ("Photocopy"); + + photocopy (drawable, NULL); + + if (run_mode != GIMP_RUN_NONINTERACTIVE) + gimp_displays_flush (); + + /* Store data */ + if (run_mode == GIMP_RUN_INTERACTIVE) + gimp_set_data (PLUG_IN_PROC, &pvals, sizeof (PhotocopyVals)); + } + else + { + status = GIMP_PDB_EXECUTION_ERROR; + *nreturn_vals = 2; + values[1].type = GIMP_PDB_STRING; + values[1].data.d_string = _("Cannot operate on indexed color images."); + } + } + + values[0].data.d_status = status; + + gimp_drawable_detach (drawable); +} + +/* + * Photocopy algorithm + * ----------------- + * Mask radius = radius of pixel neighborhood for intensity comparison + * Threshold = relative intensity difference which will result in darkening + * Ramp = amount of relative intensity difference before total black + * Blur radius = mask radius / 3.0 + * + * Algorithm: + * For each pixel, calculate pixel intensity value to be: avg (blur radius) + * relative diff = pixel intensity / avg (mask radius) + * If relative diff < Threshold + * intensity mult = (Ramp - MIN (Ramp, (Threshold - relative diff))) / Ramp + * pixel intensity *= intensity mult + * Else + * pixel intensity = white + */ +static void +photocopy (GimpDrawable *drawable, + GimpPreview *preview) +{ + GimpPixelRgn src_rgn, dest_rgn; + GimpPixelRgn *pr; + gint x, y, width, height; + gint bytes; + gboolean has_alpha; + guchar *dest1; + guchar *dest2; + guchar *src1, *sp_p1, *sp_m1; + guchar *src2, *sp_p2, *sp_m2; + gdouble n_p1[5], n_m1[5]; + gdouble n_p2[5], n_m2[5]; + gdouble d_p1[5], d_m1[5]; + gdouble d_p2[5], d_m2[5]; + gdouble bd_p1[5], bd_m1[5]; + gdouble bd_p2[5], bd_m2[5]; + gdouble *val_p1, *val_m1, *vp1, *vm1; + gdouble *val_p2, *val_m2, *vp2, *vm2; + gint i, j; + gint row, col; + gint terms; + gint progress, max_progress; + gint initial_p1[4]; + gint initial_p2[4]; + gint initial_m1[4]; + gint initial_m2[4]; + gdouble radius; + gdouble val; + gdouble std_dev1; + gdouble std_dev2; + gdouble ramp_down; + gdouble ramp_up; + + if (preview) + { + gimp_preview_get_position (preview, &x, &y); + gimp_preview_get_size (preview, &width, &height); + } + else + { + if (! gimp_drawable_mask_intersect (drawable->drawable_id, + &x, &y, &width, &height)) + return; + } + + bytes = drawable->bpp; + has_alpha = gimp_drawable_has_alpha (drawable->drawable_id); + + val_p1 = g_new (gdouble, MAX (width, height)); + val_p2 = g_new (gdouble, MAX (width, height)); + val_m1 = g_new (gdouble, MAX (width, height)); + val_m2 = g_new (gdouble, MAX (width, height)); + + dest1 = g_new0 (guchar, width * height); + dest2 = g_new0 (guchar, width * height); + + progress = 0; + max_progress = width * height * 3; + + gimp_pixel_rgn_init (&src_rgn, drawable, + x, y, width, height, FALSE, FALSE); + + for (pr = gimp_pixel_rgns_register (1, &src_rgn); + pr != NULL; + pr = gimp_pixel_rgns_process (pr)) + { + guchar *src_ptr = src_rgn.data; + guchar *dest_ptr = dest1 + (src_rgn.y - y) * width + (src_rgn.x - x); + + for (row = 0; row < src_rgn.h; row++) + { + for (col = 0; col < src_rgn.w; col++) + { + /* desaturate */ + if (bytes > 2) + dest_ptr[col] = (guchar) gimp_rgb_to_l_int (src_ptr[col * bytes + 0], + src_ptr[col * bytes + 1], + src_ptr[col * bytes + 2]); + else + dest_ptr[col] = (guchar) src_ptr[col * bytes]; + + /* compute transfer */ + val = pow (dest_ptr[col], (1.0 / GAMMA)); + dest_ptr[col] = (guchar) CLAMP (val, 0, 255); + } + + src_ptr += src_rgn.rowstride; + dest_ptr += width; + } + + if (!preview) + { + progress += src_rgn.w * src_rgn.h; + gimp_progress_update ((gdouble) progress / (gdouble) max_progress); + } + } + + /* Calculate the standard deviations */ + radius = MAX (1.0, 10 * (1.0 - pvals.sharpness)); + radius = fabs (radius) + 1.0; + std_dev1 = sqrt (-(radius * radius) / (2 * log (1.0 / 255.0))); + + radius = fabs (pvals.mask_radius) + 1.0; + std_dev2 = sqrt (-(radius * radius) / (2 * log (1.0 / 255.0))); + + /* derive the constants for calculating the gaussian from the std dev */ + find_constants (n_p1, n_m1, d_p1, d_m1, bd_p1, bd_m1, std_dev1); + find_constants (n_p2, n_m2, d_p2, d_m2, bd_p2, bd_m2, std_dev2); + + /* First the vertical pass */ + for (col = 0; col < width; col++) + { + memset (val_p1, 0, height * sizeof (gdouble)); + memset (val_p2, 0, height * sizeof (gdouble)); + memset (val_m1, 0, height * sizeof (gdouble)); + memset (val_m2, 0, height * sizeof (gdouble)); + + src1 = dest1 + col; + sp_p1 = src1; + sp_m1 = src1 + (height - 1) * width; + vp1 = val_p1; + vp2 = val_p2; + vm1 = val_m1 + (height - 1); + vm2 = val_m2 + (height - 1); + + /* Set up the first vals */ + initial_p1[0] = sp_p1[0]; + initial_m1[0] = sp_m1[0]; + + for (row = 0; row < height; row++) + { + gdouble *vpptr1, *vmptr1; + gdouble *vpptr2, *vmptr2; + + terms = (row < 4) ? row : 4; + + vpptr1 = vp1; vmptr1 = vm1; + vpptr2 = vp2; vmptr2 = vm2; + + for (i = 0; i <= terms; i++) + { + *vpptr1 += n_p1[i] * sp_p1[-i * width] - d_p1[i] * vp1[-i]; + *vmptr1 += n_m1[i] * sp_m1[i * width] - d_m1[i] * vm1[i]; + + *vpptr2 += n_p2[i] * sp_p1[-i * width] - d_p2[i] * vp2[-i]; + *vmptr2 += n_m2[i] * sp_m1[i * width] - d_m2[i] * vm2[i]; + } + + for (j = i; j <= 4; j++) + { + *vpptr1 += (n_p1[j] - bd_p1[j]) * initial_p1[0]; + *vmptr1 += (n_m1[j] - bd_m1[j]) * initial_m1[0]; + + *vpptr2 += (n_p2[j] - bd_p2[j]) * initial_p1[0]; + *vmptr2 += (n_m2[j] - bd_m2[j]) * initial_m1[0]; + } + + sp_p1 += width; + sp_m1 -= width; + vp1 += 1; + vp2 += 1; + vm1 -= 1; + vm2 -= 1; + } + + transfer_pixels (val_p1, val_m1, dest1 + col, width, height); + transfer_pixels (val_p2, val_m2, dest2 + col, width, height); + + if (!preview) + { + progress += height; + if ((col % 5) == 0) + gimp_progress_update ((gdouble) progress / (gdouble) max_progress); + } + } + + for (row = 0; row < height; row++) + { + memset (val_p1, 0, width * sizeof (gdouble)); + memset (val_p2, 0, width * sizeof (gdouble)); + memset (val_m1, 0, width * sizeof (gdouble)); + memset (val_m2, 0, width * sizeof (gdouble)); + + src1 = dest1 + row * width; + src2 = dest2 + row * width; + + sp_p1 = src1; + sp_p2 = src2; + sp_m1 = src1 + width - 1; + sp_m2 = src2 + width - 1; + vp1 = val_p1; + vp2 = val_p2; + vm1 = val_m1 + width - 1; + vm2 = val_m2 + width - 1; + + /* Set up the first vals */ + initial_p1[0] = sp_p1[0]; + initial_p2[0] = sp_p2[0]; + initial_m1[0] = sp_m1[0]; + initial_m2[0] = sp_m2[0]; + + for (col = 0; col < width; col++) + { + gdouble *vpptr1, *vmptr1; + gdouble *vpptr2, *vmptr2; + + terms = (col < 4) ? col : 4; + + vpptr1 = vp1; vmptr1 = vm1; + vpptr2 = vp2; vmptr2 = vm2; + + for (i = 0; i <= terms; i++) + { + *vpptr1 += n_p1[i] * sp_p1[-i] - d_p1[i] * vp1[-i]; + *vmptr1 += n_m1[i] * sp_m1[i] - d_m1[i] * vm1[i]; + + *vpptr2 += n_p2[i] * sp_p2[-i] - d_p2[i] * vp2[-i]; + *vmptr2 += n_m2[i] * sp_m2[i] - d_m2[i] * vm2[i]; + } + + for (j = i; j <= 4; j++) + { + *vpptr1 += (n_p1[j] - bd_p1[j]) * initial_p1[0]; + *vmptr1 += (n_m1[j] - bd_m1[j]) * initial_m1[0]; + + *vpptr2 += (n_p2[j] - bd_p2[j]) * initial_p2[0]; + *vmptr2 += (n_m2[j] - bd_m2[j]) * initial_m2[0]; + } + + sp_p1 ++; + sp_p2 ++; + sp_m1 --; + sp_m2 --; + vp1 ++; + vp2 ++; + vm1 --; + vm2 --; + } + + transfer_pixels (val_p1, val_m1, dest1 + row * width, 1, width); + transfer_pixels (val_p2, val_m2, dest2 + row * width, 1, width); + + if (!preview) + { + progress += width; + if ((row % 5) == 0) + gimp_progress_update ((gdouble) progress / (gdouble) max_progress); + } + } + + /* Compute the ramp value which sets 'pct_black' % of the darkened pixels black */ + ramp_down = compute_ramp (dest1, dest2, width * height, pvals.pct_black, 1); + ramp_up = compute_ramp (dest1, dest2, width * height, 1.0 - pvals.pct_white, 0); + + /* Initialize the pixel regions. */ + gimp_pixel_rgn_init (&src_rgn, drawable, x, y, width, height, FALSE, FALSE); + gimp_pixel_rgn_init (&dest_rgn, drawable, x, y, width, height, + (preview == NULL), TRUE); + + pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn); + + while (pr) + { + guchar *src_ptr = src_rgn.data; + guchar *dest_ptr = dest_rgn.data; + guchar *blur_ptr = dest1 + (src_rgn.y - y) * width + (src_rgn.x - x); + guchar *avg_ptr = dest2 + (src_rgn.y - y) * width + (src_rgn.x - x); + gdouble diff, mult; + gdouble lightness = 0.0; + + for (row = 0; row < src_rgn.h; row++) + { + for (col = 0; col < src_rgn.w; col++) + { + if (avg_ptr[col] > EPSILON) + { + diff = (gdouble) blur_ptr[col] / (gdouble) avg_ptr[col]; + + if (diff < pvals.threshold) + { + if (ramp_down == 0.0) + mult = 0.0; + else + mult = (ramp_down - MIN (ramp_down, + (pvals.threshold - diff))) / ramp_down; + lightness = CLAMP (blur_ptr[col] * mult, 0, 255); + } + else + { + if (ramp_up == 0.0) + mult = 1.0; + else + mult = MIN (ramp_up, + (diff - pvals.threshold)) / ramp_up; + + lightness = 255 - (1.0 - mult) * (255 - blur_ptr[col]); + lightness = CLAMP (lightness, 0, 255); + } + } + else + { + lightness = 0; + } + + if (bytes < 3) + { + dest_ptr[col * bytes] = (guchar) lightness; + if (has_alpha) + dest_ptr[col * bytes + 1] = src_ptr[col * src_rgn.bpp + 1]; + } + else + { + dest_ptr[col * bytes + 0] = lightness; + dest_ptr[col * bytes + 1] = lightness; + dest_ptr[col * bytes + 2] = lightness; + + if (has_alpha) + dest_ptr[col * bytes + 3] = src_ptr[col * src_rgn.bpp + 3]; + } + } + + src_ptr += src_rgn.rowstride; + dest_ptr += dest_rgn.rowstride; + blur_ptr += width; + avg_ptr += width; + } + + if (preview) + { + gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview), + &dest_rgn); + } + else + { + progress += src_rgn.w * src_rgn.h; + gimp_progress_update ((gdouble) progress / (gdouble) max_progress); + } + + pr = gimp_pixel_rgns_process (pr); + } + + if (! preview) + { + gimp_progress_update (1.0); + /* merge the shadow, update the drawable */ + gimp_drawable_flush (drawable); + gimp_drawable_merge_shadow (drawable->drawable_id, TRUE); + gimp_drawable_update (drawable->drawable_id, x, y, width, height); + } + + /* free up buffers */ + g_free (val_p1); + g_free (val_p2); + g_free (val_m1); + g_free (val_m2); + g_free (dest1); + g_free (dest2); +} + +static gdouble +compute_ramp (guchar *dest1, + guchar *dest2, + gint length, + gdouble pct, + gint under_threshold) +{ + gint hist[2000]; + gdouble diff; + gint count; + gint i; + gint sum; + + memset (hist, 0, sizeof (int) * 2000); + count = 0; + + for (i = 0; i < length; i++) + { + if (*dest2 != 0) + { + diff = (gdouble) *dest1 / (gdouble) *dest2; + + if (under_threshold) + { + if (diff < pvals.threshold) + { + hist[(int) (diff * 1000)] += 1; + count += 1; + } + } + else + { + if (diff >= pvals.threshold && diff < 2.0) + { + hist[(int) (diff * 1000)] += 1; + count += 1; + } + } + } + + dest1++; + dest2++; + } + + if (pct == 0.0 || count == 0) + return (under_threshold ? 1.0 : 0.0); + + sum = 0; + for (i = 0; i < 2000; i++) + { + sum += hist[i]; + if (((gdouble) sum / (gdouble) count) > pct) + { + if (under_threshold) + return (pvals.threshold - (gdouble) i / 1000.0); + else + return ((gdouble) i / 1000.0 - pvals.threshold); + } + } + + return (under_threshold ? 0.0 : 1.0); +} + + +/* + * Gaussian blur helper functions + */ + +static void +transfer_pixels (gdouble *src1, + gdouble *src2, + guchar *dest, + gint jump, + gint width) +{ + gint i; + gdouble sum; + + for(i = 0; i < width; i++) + { + sum = src1[i] + src2[i]; + if (sum > 255) sum = 255; + else if(sum < 0) sum = 0; + + *dest = (guchar) sum; + + dest += jump; + } +} + +static void +find_constants (gdouble n_p[], + gdouble n_m[], + gdouble d_p[], + gdouble d_m[], + gdouble bd_p[], + gdouble bd_m[], + gdouble std_dev) +{ + gint i; + gdouble constants [8]; + gdouble div; + + /* The constants used in the implementation of a casual sequence + * using a 4th order approximation of the gaussian operator + */ + + div = sqrt (2 * G_PI) * std_dev; + constants [0] = -1.783 / std_dev; + constants [1] = -1.723 / std_dev; + constants [2] = 0.6318 / std_dev; + constants [3] = 1.997 / std_dev; + constants [4] = 1.6803 / div; + constants [5] = 3.735 / div; + constants [6] = -0.6803 / div; + constants [7] = -0.2598 / div; + + n_p [0] = constants[4] + constants[6]; + n_p [1] = exp (constants[1]) * + (constants[7] * sin (constants[3]) - + (constants[6] + 2 * constants[4]) * cos (constants[3])) + + exp (constants[0]) * + (constants[5] * sin (constants[2]) - + (2 * constants[6] + constants[4]) * cos (constants[2])); + n_p [2] = 2 * exp (constants[0] + constants[1]) * + ((constants[4] + constants[6]) * cos (constants[3]) * cos (constants[2]) - + constants[5] * cos (constants[3]) * sin (constants[2]) - + constants[7] * cos (constants[2]) * sin (constants[3])) + + constants[6] * exp (2 * constants[0]) + + constants[4] * exp (2 * constants[1]); + n_p [3] = exp (constants[1] + 2 * constants[0]) * + (constants[7] * sin (constants[3]) - constants[6] * cos (constants[3])) + + exp (constants[0] + 2 * constants[1]) * + (constants[5] * sin (constants[2]) - constants[4] * cos (constants[2])); + n_p [4] = 0.0; + + d_p [0] = 0.0; + d_p [1] = -2 * exp (constants[1]) * cos (constants[3]) - + 2 * exp (constants[0]) * cos (constants[2]); + d_p [2] = 4 * cos (constants[3]) * cos (constants[2]) * exp (constants[0] + constants[1]) + + exp (2 * constants[1]) + exp (2 * constants[0]); + d_p [3] = -2 * cos (constants[2]) * exp (constants[0] + 2 * constants[1]) - + 2 * cos (constants[3]) * exp (constants[1] + 2 * constants[0]); + d_p [4] = exp (2 * constants[0] + 2 * constants[1]); + +#ifndef ORIGINAL_READABLE_CODE + memcpy(d_m, d_p, 5 * sizeof(gdouble)); +#else + for (i = 0; i <= 4; i++) + d_m [i] = d_p [i]; +#endif + + n_m[0] = 0.0; + for (i = 1; i <= 4; i++) + n_m [i] = n_p[i] - d_p[i] * n_p[0]; + + { + gdouble sum_n_p, sum_n_m, sum_d; + gdouble a, b; + + sum_n_p = 0.0; + sum_n_m = 0.0; + sum_d = 0.0; + + for (i = 0; i <= 4; i++) + { + sum_n_p += n_p[i]; + sum_n_m += n_m[i]; + sum_d += d_p[i]; + } + +#ifndef ORIGINAL_READABLE_CODE + sum_d++; + a = sum_n_p / sum_d; + b = sum_n_m / sum_d; +#else + a = sum_n_p / (1 + sum_d); + b = sum_n_m / (1 + sum_d); +#endif + + for (i = 0; i <= 4; i++) + { + bd_p[i] = d_p[i] * a; + bd_m[i] = d_m[i] * b; + } + } +} + +/*******************************************************/ +/* Dialog */ +/*******************************************************/ + +static gboolean +photocopy_dialog (GimpDrawable *drawable) +{ + GtkWidget *dialog; + GtkWidget *main_vbox; + GtkWidget *preview; + GtkWidget *table; + GtkObject *scale_data; + gboolean run; + + gimp_ui_init (PLUG_IN_BINARY, FALSE); + + dialog = gimp_dialog_new (_("Photocopy"), PLUG_IN_ROLE, + NULL, 0, + gimp_standard_help_func, PLUG_IN_PROC, + + _("_Cancel"), GTK_RESPONSE_CANCEL, + _("_OK"), GTK_RESPONSE_OK, + + NULL); + + gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog), + GTK_RESPONSE_OK, + GTK_RESPONSE_CANCEL, + -1); + + gimp_window_set_transient (GTK_WINDOW (dialog)); + + main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12); + gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12); + gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))), + main_vbox, TRUE, TRUE, 0); + gtk_widget_show (main_vbox); + + preview = gimp_drawable_preview_new_from_drawable_id (drawable->drawable_id); + gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0); + gtk_widget_show (preview); + + g_signal_connect_swapped (preview, "invalidated", + G_CALLBACK (photocopy), + drawable); + + table = gtk_table_new (4, 3, FALSE); + gtk_table_set_col_spacings (GTK_TABLE (table), 6); + gtk_table_set_row_spacings (GTK_TABLE (table), 6); + gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0); + gtk_widget_show (table); + + /* Label, scale, entry for pvals.amount */ + scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0, + _("_Mask radius:"), 100, 5, + pvals.mask_radius, 3.0, 50.0, 1, 5.0, 2, + TRUE, 0, 0, + NULL, NULL); + + g_signal_connect (scale_data, "value-changed", + G_CALLBACK (gimp_double_adjustment_update), + &pvals.mask_radius); + g_signal_connect_swapped (scale_data, "value-changed", + G_CALLBACK (gimp_preview_invalidate), + preview); + + /* Label, scale, entry for pvals.amount */ + scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1, + _("_Sharpness:"), 50, 5, + pvals.sharpness, 0.0, 1.0, 0.01, 0.1, 3, + TRUE, 0, 0, + NULL, NULL); + + g_signal_connect (scale_data, "value-changed", + G_CALLBACK (gimp_double_adjustment_update), + &pvals.sharpness); + g_signal_connect_swapped (scale_data, "value-changed", + G_CALLBACK (gimp_preview_invalidate), + preview); + + /* Label, scale, entry for pvals.amount */ + scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 2, + _("Percent _black:"), 50, 5, + pvals.pct_black, 0.0, 1.0, 0.01, 0.1, 3, + TRUE, 0, 0, + NULL, NULL); + + g_signal_connect (scale_data, "value-changed", + G_CALLBACK (gimp_double_adjustment_update), + &pvals.pct_black); + g_signal_connect_swapped (scale_data, "value-changed", + G_CALLBACK (gimp_preview_invalidate), + preview); + + /* Label, scale, entry for pvals.amount */ + scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 3, + _("Percent _white:"), 50, 5, + pvals.pct_white, 0.0, 1.0, 0.01, 0.1, 3, + TRUE, 0, 0, + NULL, NULL); + + g_signal_connect (scale_data, "value-changed", + G_CALLBACK (gimp_double_adjustment_update), + &pvals.pct_white); + g_signal_connect_swapped (scale_data, "value-changed", + G_CALLBACK (gimp_preview_invalidate), + preview); + + gtk_widget_show (dialog); + + run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK); + + gtk_widget_destroy (dialog); + + return run; +} |