/* The GIMP -- an image manipulation program * Copyright (C) 1995 Spencer Kimball and Peter Mattis * * gimp_brush_generated module Copyright 1998 Jay Cox * * 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 #include #include #ifdef HAVE_UNISTD_H #include #endif #include #include "libgimpmath/gimpmath.h" #include "core-types.h" #include "base/base-config.h" #include "base/temp-buf.h" #include "gimpbrushgenerated.h" #define OVERSAMPLING 5 /* local function prototypes */ static void gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass); static void gimp_brush_generated_init (GimpBrushGenerated *brush); static gboolean gimp_brush_generated_save (GimpData *data); static void gimp_brush_generated_dirty (GimpData *data); static gchar * gimp_brush_generated_get_extension (GimpData *data); static GimpData * gimp_brush_generated_duplicate (GimpData *data); static GimpBrushClass *parent_class = NULL; GType gimp_brush_generated_get_type (void) { static GType brush_type = 0; if (! brush_type) { static const GTypeInfo brush_info = { sizeof (GimpBrushGeneratedClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gimp_brush_generated_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (GimpBrushGenerated), 0, /* n_preallocs */ (GInstanceInitFunc) gimp_brush_generated_init, }; brush_type = g_type_register_static (GIMP_TYPE_BRUSH, "GimpBrushGenerated", &brush_info, 0); } return brush_type; } static void gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass) { GimpDataClass *data_class; data_class = GIMP_DATA_CLASS (klass); parent_class = g_type_class_peek_parent (klass); data_class->save = gimp_brush_generated_save; data_class->dirty = gimp_brush_generated_dirty; data_class->get_extension = gimp_brush_generated_get_extension; data_class->duplicate = gimp_brush_generated_duplicate; } static void gimp_brush_generated_init (GimpBrushGenerated *brush) { brush->radius = 5.0; brush->hardness = 0.0; brush->angle = 0.0; brush->aspect_ratio = 1.0; brush->freeze = 0; } static gboolean gimp_brush_generated_save (GimpData *data) { GimpBrushGenerated *brush; FILE *fp; g_return_val_if_fail (data != NULL, FALSE); g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (data), FALSE); brush = GIMP_BRUSH_GENERATED (data); /* we are (finaly) ready to try to save the generated brush file */ if ((fp = fopen (data->filename, "wb")) == NULL) { g_warning ("Unable to save file %s", data->filename); return FALSE; } /* write magic header */ fprintf (fp, "GIMP-VBR\n"); /* write version */ fprintf (fp, "1.0\n"); /* write name */ fprintf (fp, "%.255s\n", GIMP_OBJECT (brush)->name); /* write brush spacing */ fprintf (fp, "%f\n", (gfloat) GIMP_BRUSH (brush)->spacing); /* write brush radius */ fprintf (fp, "%f\n", brush->radius); /* write brush hardness */ fprintf (fp, "%f\n", brush->hardness); /* write brush aspect_ratio */ fprintf (fp, "%f\n", brush->aspect_ratio); /* write brush angle */ fprintf (fp, "%f\n", brush->angle); fclose (fp); return TRUE; } static gchar * gimp_brush_generated_get_extension (GimpData *data) { return GIMP_BRUSH_GENERATED_FILE_EXTENSION; } static GimpData * gimp_brush_generated_duplicate (GimpData *data) { GimpBrushGenerated *brush; brush = GIMP_BRUSH_GENERATED (data); return gimp_brush_generated_new (brush->radius, brush->hardness, brush->angle, brush->aspect_ratio); } static double gauss (gdouble f) { /* this aint' a real gauss function */ if (f < -.5) { f = -1.0 - f; return (2.0 * f*f); } if (f < .5) return (1.0 - 2.0 * f*f); f = 1.0 -f; return (2.0 * f*f); } static void gimp_brush_generated_dirty (GimpData *data) { GimpBrushGenerated *brush; register GimpBrush *gbrush = NULL; register gint x, y; register guchar *centerp; register gdouble d; register gdouble exponent; register guchar a; register gint length; register guchar *lookup; register gdouble sum, c, s, tx, ty; gdouble buffer[OVERSAMPLING]; gint width, height; brush = GIMP_BRUSH_GENERATED (data); if (brush->freeze) /* if we are frozen defer rerendering till later */ return; gbrush = GIMP_BRUSH (brush); if (base_config->stingy_memory_use && gbrush->mask) temp_buf_unswap (gbrush->mask); if (gbrush->mask) { temp_buf_free (gbrush->mask); } /* compute the range of the brush. should do a better job than this? */ s = sin (gimp_deg_to_rad (brush->angle)); c = cos (gimp_deg_to_rad (brush->angle)); tx = MAX (fabs (c*ceil (brush->radius) - s*ceil (brush->radius) / brush->aspect_ratio), fabs (c*ceil (brush->radius) + s*ceil (brush->radius) / brush->aspect_ratio)); ty = MAX (fabs (s*ceil (brush->radius) + c*ceil (brush->radius) / brush->aspect_ratio), fabs (s*ceil (brush->radius) - c*ceil (brush->radius) / brush->aspect_ratio)); if (brush->radius > tx) width = ceil (tx); else width = ceil (brush->radius); if (brush->radius > ty) height = ceil (ty); else height = ceil (brush->radius); /* compute the axis for spacing */ GIMP_BRUSH (brush)->x_axis.x = c * brush->radius; GIMP_BRUSH (brush)->x_axis.y = -1.0 * s * brush->radius; GIMP_BRUSH (brush)->y_axis.x = (s * brush->radius / brush->aspect_ratio); GIMP_BRUSH (brush)->y_axis.y = (c * brush->radius / brush->aspect_ratio); gbrush->mask = temp_buf_new (width * 2 + 1, height * 2 + 1, 1, width, height, 0); centerp = &gbrush->mask->data[height * gbrush->mask->width + width]; if ((1.0 - brush->hardness) < 0.000001) exponent = 1000000; else exponent = 1/(1.0 - brush->hardness); /* set up lookup table */ length = ceil (sqrt (2 * ceil (brush->radius+1) * ceil (brush->radius+1))+1) * OVERSAMPLING; lookup = g_malloc (length); sum = 0.0; for (x = 0; x < OVERSAMPLING; x++) { d = fabs ((x + 0.5) / OVERSAMPLING - 0.5); if (d > brush->radius) buffer[x] = 0.0; else /* buffer[x] = (1.0 - pow (d/brush->radius, exponent)); */ buffer[x] = gauss (pow (d/brush->radius, exponent)); sum += buffer[x]; } for (x = 0; d < brush->radius || sum > 0.00001; d += 1.0 / OVERSAMPLING) { sum -= buffer[x % OVERSAMPLING]; if (d > brush->radius) buffer[x % OVERSAMPLING] = 0.0; else /* buffer[x%OVERSAMPLING] = (1.0 - pow (d/brush->radius, exponent)); */ buffer[x % OVERSAMPLING] = gauss (pow (d/brush->radius, exponent)); sum += buffer[x%OVERSAMPLING]; lookup[x++] = RINT (sum * (255.0 / OVERSAMPLING)); } while (x < length) { lookup[x++] = 0; } /* compute one half and mirror it */ for (y = 0; y <= height; y++) { for (x = -width; x <= width; x++) { tx = c*x - s*y; ty = c*y + s*x; ty *= brush->aspect_ratio; d = sqrt (tx*tx + ty*ty); if (d < brush->radius+1) a = lookup[(gint) RINT (d * OVERSAMPLING)]; else a = 0; centerp[ y*gbrush->mask->width + x] = a; centerp[-1*y*gbrush->mask->width - x] = a; } } g_free (lookup); if (GIMP_DATA_CLASS (parent_class)->dirty) GIMP_DATA_CLASS (parent_class)->dirty (data); } GimpData * gimp_brush_generated_new (gfloat radius, gfloat hardness, gfloat angle, gfloat aspect_ratio) { GimpBrushGenerated *brush; /* set up normal brush data */ brush = GIMP_BRUSH_GENERATED (g_object_new (GIMP_TYPE_BRUSH_GENERATED, NULL)); gimp_object_set_name (GIMP_OBJECT (brush), "Untitled"); GIMP_BRUSH (brush)->spacing = 20; /* set up gimp_brush_generated data */ brush->radius = radius; brush->hardness = hardness; brush->angle = angle; brush->aspect_ratio = aspect_ratio; /* render brush mask */ gimp_data_dirty (GIMP_DATA (brush)); return GIMP_DATA (brush); } GimpData * gimp_brush_generated_load (const gchar *filename) { GimpBrushGenerated *brush; FILE *fp; gchar string[256]; gfloat fl; gfloat version; if ((fp = fopen (filename, "rb")) == NULL) return NULL; /* make sure the file we are reading is the right type */ fgets (string, 255, fp); if (strncmp (string, "GIMP-VBR", 8) != 0) return NULL; /* make sure we are reading a compatible version */ fgets (string, 255, fp); sscanf (string, "%f", &version); g_return_val_if_fail (version < 2.0, NULL); /* create new brush */ brush = GIMP_BRUSH_GENERATED (g_object_new (GIMP_TYPE_BRUSH_GENERATED, NULL)); gimp_data_set_filename (GIMP_DATA (brush), filename); gimp_brush_generated_freeze (brush); /* read name */ fgets (string, 255, fp); if (string[strlen (string) - 1] == '\n') string[strlen (string) - 1] = 0; gimp_object_set_name (GIMP_OBJECT (brush), string); /* read brush spacing */ fscanf (fp, "%f", &fl); GIMP_BRUSH (brush)->spacing = fl; /* read brush radius */ fscanf (fp, "%f", &fl); gimp_brush_generated_set_radius (brush, fl); /* read brush hardness */ fscanf (fp, "%f", &fl); gimp_brush_generated_set_hardness (brush, fl); /* read brush aspect_ratio */ fscanf (fp, "%f", &fl); gimp_brush_generated_set_aspect_ratio (brush, fl); /* read brush angle */ fscanf (fp, "%f", &fl); gimp_brush_generated_set_angle (brush, fl); fclose (fp); gimp_brush_generated_thaw (brush); GIMP_DATA (brush)->dirty = FALSE; if (base_config->stingy_memory_use) temp_buf_swap (GIMP_BRUSH (brush)->mask); return GIMP_DATA (brush); } void gimp_brush_generated_freeze (GimpBrushGenerated *brush) { g_return_if_fail (brush != NULL); g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush)); brush->freeze++; } void gimp_brush_generated_thaw (GimpBrushGenerated *brush) { g_return_if_fail (brush != NULL); g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush)); if (brush->freeze > 0) brush->freeze--; if (brush->freeze == 0) gimp_data_dirty (GIMP_DATA (brush)); } gfloat gimp_brush_generated_set_radius (GimpBrushGenerated *brush, gfloat radius) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); if (radius < 0.0) radius = 0.0; else if (radius > 32767.0) radius = 32767.0; if (radius == brush->radius) return radius; brush->radius = radius; if (! brush->freeze) gimp_data_dirty (GIMP_DATA (brush)); return brush->radius; } gfloat gimp_brush_generated_set_hardness (GimpBrushGenerated *brush, gfloat hardness) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); if (hardness < 0.0) hardness = 0.0; else if (hardness > 1.0) hardness = 1.0; if (brush->hardness == hardness) return hardness; brush->hardness = hardness; if (!brush->freeze) gimp_data_dirty (GIMP_DATA (brush)); return brush->hardness; } gfloat gimp_brush_generated_set_angle (GimpBrushGenerated *brush, gfloat angle) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); if (angle < 0.0) angle = -1.0 * fmod (angle, 180.0); else if (angle > 180.0) angle = fmod (angle, 180.0); if (brush->angle == angle) return angle; brush->angle = angle; if (!brush->freeze) gimp_data_dirty (GIMP_DATA (brush)); return brush->angle; } gfloat gimp_brush_generated_set_aspect_ratio (GimpBrushGenerated *brush, gfloat ratio) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); if (ratio < 1.0) ratio = 1.0; else if (ratio > 1000) ratio = 1000; if (brush->aspect_ratio == ratio) return ratio; brush->aspect_ratio = ratio; if (!brush->freeze) gimp_data_dirty (GIMP_DATA (brush)); return brush->aspect_ratio; } gfloat gimp_brush_generated_get_radius (const GimpBrushGenerated *brush) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); return brush->radius; } gfloat gimp_brush_generated_get_hardness (const GimpBrushGenerated *brush) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); return brush->hardness; } gfloat gimp_brush_generated_get_angle (const GimpBrushGenerated *brush) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); return brush->angle; } gfloat gimp_brush_generated_get_aspect_ratio (const GimpBrushGenerated *brush) { g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED (brush), -1.0); return brush->aspect_ratio; }