mirror of
https://gitlab.gnome.org/GNOME/gimp
synced 2024-10-21 20:12:30 +00:00
a27cedc001
done in pieces, don't expect to be able to compile on Win32 from these sources yet. Ans of course, the official version of GTk+ doesn't include the Win32 stuff yet.
438 lines
11 KiB
C
438 lines
11 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimp_brush_generated module Copyright 1998 Jay Cox <jaycox@earthlink.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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#ifndef HAVE_RINT
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#define rint(x) floor (x + 0.5)
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#endif
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#include "appenv.h"
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#include "gimpbrushgenerated.h"
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#include "paint_core.h"
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#include "gimprc.h"
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#define OVERSAMPLING 5
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static void
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gimp_brush_generated_generate(GimpBrushGenerated *brush);
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static GimpObjectClass* parent_class;
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static void
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gimp_brush_generated_destroy(GtkObject *object)
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{
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GTK_OBJECT_CLASS(parent_class)->destroy (object);
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}
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static void
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gimp_brush_generated_class_init (GimpBrushGeneratedClass *klass)
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{
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GtkObjectClass *object_class;
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object_class = GTK_OBJECT_CLASS(klass);
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parent_class = gtk_type_class (GIMP_TYPE_BRUSH);
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object_class->destroy = gimp_brush_generated_destroy;
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}
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void
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gimp_brush_generated_init(GimpBrushGenerated *brush)
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{
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brush->radius = 5.0;
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brush->hardness = 0.0;
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brush->angle = 0.0;
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brush->aspect_ratio = 1.0;
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brush->freeze = 0;
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}
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guint gimp_brush_generated_get_type(void)
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{
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static GtkType type;
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if(!type){
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GtkTypeInfo info={
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"GimpBrushGenerated",
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sizeof(GimpBrushGenerated),
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sizeof(GimpBrushGeneratedClass),
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(GtkClassInitFunc)gimp_brush_generated_class_init,
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(GtkObjectInitFunc)gimp_brush_generated_init,
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NULL,
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NULL };
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type=gtk_type_unique(GIMP_TYPE_BRUSH, &info);
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}
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return type;
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}
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GimpBrushGenerated *gimp_brush_generated_new(float radius, float hardness,
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float angle, float aspect_ratio)
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{
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GimpBrushGenerated *brush;
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/* set up normal brush data */
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brush = GIMP_BRUSH_GENERATED(gimp_type_new(gimp_brush_generated_get_type ()));
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GIMP_BRUSH(brush)->name = g_strdup ("AAAGenerated");
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GIMP_BRUSH(brush)->spacing = 20;
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/* set up gimp_brush_generated data */
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brush->radius = radius;
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brush->hardness = hardness;
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brush->angle = angle;
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brush->aspect_ratio = aspect_ratio;
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/* render brush mask */
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gimp_brush_generated_generate(brush);
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return brush;
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}
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GimpBrushGenerated *
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gimp_brush_generated_load (const char *file_name)
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{
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GimpBrushGenerated *brush;
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FILE *fp;
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char string[256];
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float fl;
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float version;
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if ((fp = fopen(file_name, "rb")) == NULL)
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return NULL;
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/* make sure the file we are reading is the right type */
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fscanf(fp, "%8s", string);
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g_return_val_if_fail(strcmp(string, "GIMP-VBR") == 0, NULL);
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/* make sure we are reading a compatible version */
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fscanf(fp, "%f", &version);
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g_return_val_if_fail(version < 2.0, NULL);
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/* create new brush */
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brush = GIMP_BRUSH_GENERATED(gimp_type_new(gimp_brush_generated_get_type()));
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GIMP_BRUSH(brush)->filename = g_strdup (file_name);
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gimp_brush_generated_freeze(brush);
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/* read name */
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fscanf(fp, "%255s", string);
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GIMP_BRUSH(brush)->name = g_strdup (string);
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/* read brush spacing */
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fscanf(fp, "%f", &fl);
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GIMP_BRUSH(brush)->spacing = fl;
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/* read brush radius */
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fscanf(fp, "%f", &fl);
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gimp_brush_generated_set_radius(brush, fl);
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/* read brush hardness */
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fscanf(fp, "%f", &fl);
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gimp_brush_generated_set_hardness(brush, fl);
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/* read brush aspect_ratio */
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fscanf(fp, "%f", &fl);
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gimp_brush_generated_set_aspect_ratio(brush, fl);
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/* read brush angle */
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fscanf(fp, "%f", &fl);
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gimp_brush_generated_set_angle(brush, fl);
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fclose(fp);
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gimp_brush_generated_thaw(brush);
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if (stingy_memory_use)
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temp_buf_swap (GIMP_BRUSH(brush)->mask);
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return brush;
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}
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void
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gimp_brush_generated_save (GimpBrushGenerated *brush,
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const char *file_name)
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{
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/* WARNING: untested function */
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FILE *fp;
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if ((fp = fopen(file_name, "wb")) == NULL)
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{
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g_warning("Unable to save file %s", file_name);
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return;
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}
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/* write magic header */
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fprintf(fp, "GIMP-VBR\n");
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/* write version */
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fprintf(fp, "1.0\n");
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/* write name */
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fprintf(fp, "%s", GIMP_BRUSH(brush)->name);
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/* write brush spacing */
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fprintf(fp, "%f", (float)GIMP_BRUSH(brush)->spacing);
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/* write brush radius */
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fprintf(fp, "%f", brush->radius);
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/* write brush hardness */
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fprintf(fp, "%f", brush->hardness);
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/* write brush aspect_ratio */
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fprintf(fp, "%f", brush->aspect_ratio);
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/* write brush angle */
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fprintf(fp, "%f", brush->angle);
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fclose(fp);
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}
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void
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gimp_brush_generated_freeze(GimpBrushGenerated *brush)
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{
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g_return_if_fail (brush != NULL);
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g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
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brush->freeze++;
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}
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void
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gimp_brush_generated_thaw(GimpBrushGenerated *brush)
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{
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g_return_if_fail (brush != NULL);
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g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
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if (brush->freeze > 0)
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brush->freeze--;
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if (brush->freeze == 0)
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gimp_brush_generated_generate(brush);
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}
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static
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double gauss(double f)
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{ /* this aint' a real gauss function */
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if (f < -.5)
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{
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f = -1.0-f;
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return (2.0*f*f);
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}
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if (f < .5)
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return (1.0-2.0*f*f);
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f = 1.0 -f;
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return (2.0*f*f);
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}
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void
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gimp_brush_generated_generate(GimpBrushGenerated *brush)
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{
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register GimpBrush *gbrush = NULL;
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register int x, y;
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register guchar *centerp;
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register double d;
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register double exponent;
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register guchar a;
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register int length;
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register guchar *lookup;
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double buffer[OVERSAMPLING];
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register double sum, c, s, tx, ty;
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int width, height;
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g_return_if_fail (brush != NULL);
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g_return_if_fail (GIMP_IS_BRUSH_GENERATED (brush));
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if (brush->freeze) /* if we are frozen defer rerendering till later */
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return;
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gbrush = GIMP_BRUSH(brush);
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if (stingy_memory_use && gbrush->mask)
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temp_buf_unswap (gbrush->mask);
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if (gbrush->mask)
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{
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temp_buf_free(gbrush->mask);
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}
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/* compute the range of the brush. should do a better job than this? */
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s = sin(brush->angle*M_PI/180.0);
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c = cos(brush->angle*M_PI/180.0);
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tx = MAXIMUM(fabs(c*ceil(brush->radius) - s*ceil(brush->radius)
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/brush->aspect_ratio),
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fabs(c*ceil(brush->radius) + s*ceil(brush->radius)
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/brush->aspect_ratio));
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ty = MAXIMUM(fabs(s*ceil(brush->radius) + c*ceil(brush->radius)
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/brush->aspect_ratio),
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fabs(s*ceil(brush->radius) - c*ceil(brush->radius)
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/brush->aspect_ratio));
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if (brush->radius > tx)
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width = ceil(tx);
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else
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width = ceil(brush->radius);
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if (brush->radius > ty)
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height = ceil(ty);
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else
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height = ceil(brush->radius);
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/* compute the axis for spacing */
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GIMP_BRUSH(brush)->x_axis.x = c*brush->radius;
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GIMP_BRUSH(brush)->x_axis.y = -1.0*s*brush->radius;
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GIMP_BRUSH(brush)->y_axis.x = (s*brush->radius / brush->aspect_ratio);
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GIMP_BRUSH(brush)->y_axis.y = (c*brush->radius / brush->aspect_ratio);
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gbrush->mask = temp_buf_new(width*2 + 1,
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height*2 + 1,
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1, width, height, 0);
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centerp = &gbrush->mask->data[height*gbrush->mask->width + width];
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if ((1.0 - brush->hardness) < 0.000001)
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exponent = 1000000;
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else
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exponent = 1/(1.0 - brush->hardness);
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/* set up lookup table */
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length = ceil(sqrt(2*ceil(brush->radius+1)*ceil(brush->radius+1))+1) * OVERSAMPLING;
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lookup = g_malloc(length);
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sum = 0.0;
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for (x = 0; x < OVERSAMPLING; x++)
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{
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d = fabs((x+.5)/OVERSAMPLING - .5);
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if (d > brush->radius)
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buffer[x] = 0.0;
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else
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/* buffer[x] = (1.0 - pow(d/brush->radius, exponent));*/
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buffer[x] = gauss(pow(d/brush->radius, exponent));
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sum += buffer[x];
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}
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for (x = 0; d < brush->radius || sum > .00001; d += 1.0/OVERSAMPLING)
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{
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sum -= buffer[x%OVERSAMPLING];
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if (d > brush->radius)
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buffer[x%OVERSAMPLING] = 0.0;
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else
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/* buffer[x%OVERSAMPLING] = (1.0 - pow(d/brush->radius, exponent));*/
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buffer[x%OVERSAMPLING] = gauss(pow(d/brush->radius, exponent));
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sum += buffer[x%OVERSAMPLING];
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lookup[x++] = rint(sum*(255.0/OVERSAMPLING));
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}
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while (x < length)
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{
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lookup[x++] = 0;
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}
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/* compute one half and mirror it */
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for (y = 0; y <= height; y++)
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{
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for (x = -width; x <= width; x++)
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{
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tx = c*x - s*y;
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ty = c*y + s*x;
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ty *= brush->aspect_ratio;
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d = sqrt(tx*tx + ty*ty);
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if (d < brush->radius+1)
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a = lookup[(int)rint(d*OVERSAMPLING)];
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else
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a = 0;
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centerp[ y*gbrush->mask->width + x] = a;
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centerp[-1*y*gbrush->mask->width - x] = a;
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}
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}
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g_free (lookup);
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gtk_signal_emit_by_name(GTK_OBJECT(brush), "dirty");
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/* brush_changed_notify(GIMP_BRUSH(brush)); */
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}
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float
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gimp_brush_generated_set_radius (GimpBrushGenerated* brush, float radius)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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if (radius < 0.0)
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radius = 0.0;
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else if(radius > 32767.0)
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radius = 32767.0;
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if (radius == brush->radius)
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return radius;
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brush->radius = radius;
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if (!brush->freeze)
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gimp_brush_generated_generate(brush);
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return brush->radius;
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}
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float
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gimp_brush_generated_set_hardness (GimpBrushGenerated* brush, float hardness)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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if (hardness < 0.0)
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hardness = 0.0;
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else if(hardness > 1.0)
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hardness = 1.0;
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if (brush->hardness == hardness)
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return hardness;
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brush->hardness = hardness;
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if (!brush->freeze)
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gimp_brush_generated_generate(brush);
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return brush->hardness;
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}
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float
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gimp_brush_generated_set_angle (GimpBrushGenerated* brush, float angle)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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if (angle < 0.0)
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angle = -1.0 * fmod(angle, 180.0);
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else if(angle > 180.0)
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angle = fmod(angle, 180.0);
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if (brush->angle == angle)
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return angle;
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brush->angle = angle;
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if (!brush->freeze)
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gimp_brush_generated_generate(brush);
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return brush->angle;
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}
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float
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gimp_brush_generated_set_aspect_ratio (GimpBrushGenerated* brush, float ratio)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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if (ratio < 1.0)
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ratio = 1.0;
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else if(ratio > 1000)
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ratio = 1000;
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if (brush->aspect_ratio == ratio)
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return ratio;
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brush->aspect_ratio = ratio;
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if (!brush->freeze)
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gimp_brush_generated_generate(brush);
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return brush->aspect_ratio;
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}
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float
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gimp_brush_generated_get_radius (const GimpBrushGenerated* brush)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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return brush->radius;
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}
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float
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gimp_brush_generated_get_hardness (const GimpBrushGenerated* brush)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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return brush->hardness;
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}
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float
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gimp_brush_generated_get_angle (const GimpBrushGenerated* brush)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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return brush->angle;
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}
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float
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gimp_brush_generated_get_aspect_ratio (const GimpBrushGenerated* brush)
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{
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g_return_val_if_fail (GIMP_IS_BRUSH_GENERATED(brush), -1.0);
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return brush->aspect_ratio;
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}
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