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-rw-r--r--plug-ins/common/emboss.c550
1 files changed, 550 insertions, 0 deletions
diff --git a/plug-ins/common/emboss.c b/plug-ins/common/emboss.c
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+/**************************************************
+ * file: emboss/emboss.c
+ *
+ * Copyright (c) 1997 Eric L. Hernes (erich@rrnet.com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "libgimp/stdplugins-intl.h"
+
+
+#define PLUG_IN_PROC "plug-in-emboss"
+#define PLUG_IN_BINARY "emboss"
+#define PLUG_IN_ROLE "gimp-emboss"
+
+
+enum
+{
+ FUNCTION_BUMPMAP = 0,
+ FUNCTION_EMBOSS = 1
+};
+
+typedef struct
+{
+ gdouble azimuth;
+ gdouble elevation;
+ gint32 depth;
+ gint32 embossp;
+} piArgs;
+
+static piArgs evals =
+{
+ 30.0, /* azimuth */
+ 45.0, /* elevation */
+ 20, /* depth */
+ 1 /* emboss */
+};
+
+struct embossFilter
+{
+ gdouble Lx;
+ gdouble Ly;
+ gdouble Lz;
+ gdouble Nz;
+ gdouble Nz2;
+ gdouble NzLz;
+ gdouble bg;
+} static Filter;
+
+static void query (void);
+static void run (const gchar *name,
+ gint nparam,
+ const GimpParam *param,
+ gint *nretvals,
+ GimpParam **retvals);
+
+static void emboss (GimpDrawable *drawable,
+ GimpPreview *preview);
+static gboolean emboss_dialog (GimpDrawable *drawable);
+
+static void emboss_init (gdouble azimuth,
+ gdouble elevation,
+ gushort width45);
+static void emboss_row (const guchar *src,
+ const guchar *texture,
+ guchar *dst,
+ guint width,
+ guint bypp,
+ gboolean alpha);
+
+
+#define DtoR(d) ((d)*(G_PI/(gdouble)180))
+
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+ NULL, /* init */
+ NULL, /* quit */
+ query, /* query */
+ run, /* run */
+};
+
+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", "The Image" },
+ { GIMP_PDB_DRAWABLE, "drawable", "The Drawable" },
+ { GIMP_PDB_FLOAT, "azimuth", "The Light Angle (degrees)" },
+ { GIMP_PDB_FLOAT, "elevation", "The Elevation Angle (degrees)" },
+ { GIMP_PDB_INT32, "depth", "The Filter Width" },
+ { GIMP_PDB_INT32, "emboss", "Emboss or Bumpmap" }
+ };
+
+ gimp_install_procedure (PLUG_IN_PROC,
+ N_("Simulate an image created by embossing"),
+ "Emboss or Bumpmap the given drawable, specifying "
+ "the angle and elevation for the light source.",
+ "Eric L. Hernes, John Schlag",
+ "Eric L. Hernes",
+ "1997",
+ N_("_Emboss (legacy)..."),
+ "RGB*",
+ GIMP_PLUGIN,
+ G_N_ELEMENTS (args), 0,
+ args, NULL);
+
+ gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Distorts");
+}
+
+static void
+run (const gchar *name,
+ gint nparam,
+ const GimpParam *param,
+ gint *nretvals,
+ GimpParam **retvals)
+{
+ static GimpParam rvals[1];
+ GimpDrawable *drawable;
+
+ *nretvals = 1;
+ *retvals = rvals;
+
+ INIT_I18N ();
+
+ drawable = gimp_drawable_get (param[2].data.d_drawable);
+ gimp_tile_cache_ntiles (drawable->ntile_cols);
+
+
+ rvals[0].type = GIMP_PDB_STATUS;
+ rvals[0].data.d_status = GIMP_PDB_SUCCESS;
+
+ switch (param[0].data.d_int32)
+ {
+ case GIMP_RUN_INTERACTIVE:
+ gimp_get_data (PLUG_IN_PROC, &evals);
+
+ if (! emboss_dialog (drawable))
+ {
+ rvals[0].data.d_status = GIMP_PDB_CANCEL;
+ }
+ else
+ {
+ gimp_set_data (PLUG_IN_PROC, &evals, sizeof (piArgs));
+ }
+
+ break;
+
+ case GIMP_RUN_NONINTERACTIVE:
+ if (nparam != 7)
+ {
+ rvals[0].data.d_status = GIMP_PDB_CALLING_ERROR;
+ break;
+ }
+
+ evals.azimuth = param[3].data.d_float;
+ evals.elevation = param[4].data.d_float;
+ evals.depth = param[5].data.d_int32;
+ evals.embossp = param[6].data.d_int32;
+
+ emboss (drawable, NULL);
+ break;
+
+ case GIMP_RUN_WITH_LAST_VALS:
+ gimp_get_data (PLUG_IN_PROC, &evals);
+ /* use this image and drawable, even with last args */
+ emboss (drawable, NULL);
+ break;
+ }
+}
+
+#define pixelScale 255.9
+
+static void
+emboss_init (gdouble azimuth,
+ gdouble elevation,
+ gushort width45)
+{
+ /*
+ * compute the light vector from the input parameters.
+ * normalize the length to pixelScale for fast shading calculation.
+ */
+ Filter.Lx = cos (azimuth) * cos (elevation) * pixelScale;
+ Filter.Ly = sin (azimuth) * cos (elevation) * pixelScale;
+ Filter.Lz = sin (elevation) * pixelScale;
+
+ /*
+ * constant z component of image surface normal - this depends on the
+ * image slope we wish to associate with an angle of 45 degrees, which
+ * depends on the width of the filter used to produce the source image.
+ */
+ Filter.Nz = (6 * 255) / width45;
+ Filter.Nz2 = Filter.Nz * Filter.Nz;
+ Filter.NzLz = Filter.Nz * Filter.Lz;
+
+ /* optimization for vertical normals: L.[0 0 1] */
+ Filter.bg = Filter.Lz;
+}
+
+
+/*
+ * ANSI C code from the article
+ * "Fast Embossing Effects on Raster Image Data"
+ * by John Schlag, jfs@kerner.com
+ * in "Graphics Gems IV", Academic Press, 1994
+ *
+ *
+ * Emboss - shade 24-bit pixels using a single distant light source.
+ * Normals are obtained by differentiating a monochrome 'bump' image.
+ * The unary case ('texture' == NULL) uses the shading result as output.
+ * The binary case multiples the optional 'texture' image by the shade.
+ * Images are in row major order with interleaved color components (rgbrgb...).
+ * E.g., component c of pixel x,y of 'dst' is dst[3*(y*width + x) + c].
+ *
+ */
+
+static void
+emboss_row (const guchar *src,
+ const guchar *texture,
+ guchar *dst,
+ guint width,
+ guint bypp,
+ gboolean alpha)
+{
+ const guchar *s[3];
+ gdouble M[3][3];
+ gint x, bytes;
+
+ /* mung pixels, avoiding edge pixels */
+ s[0] = src;
+ s[1] = s[0] + (width * bypp);
+ s[2] = s[1] + (width * bypp);
+ dst += bypp;
+
+ bytes = (alpha) ? bypp - 1 : bypp;
+
+ if (texture)
+ texture += (width + 1) * bypp;
+
+ for (x = 1; x < width - 1; x++)
+ {
+ gdouble a;
+ glong Nx, Ny, NdotL;
+ gint shade, b;
+ gint i, j;
+
+ for (i = 0; i < 3; i++)
+ for (j = 0; j < 3; j++)
+ M[i][j] = 0.0;
+
+ for (b = 0; b < bytes; b++)
+ {
+ for (i = 0; i < 3; i++)
+ for (j = 0; j < 3; j++)
+ {
+ if (alpha)
+ a = s[i][j * bypp + bytes] / 255.0;
+ else
+ a = 1.0;
+
+ M[i][j] += a * s[i][j * bypp + b];
+ }
+ }
+
+ Nx = M[0][0] + M[1][0] + M[2][0] - M[0][2] - M[1][2] - M[2][2];
+ Ny = M[2][0] + M[2][1] + M[2][2] - M[0][0] - M[0][1] - M[0][2];
+
+ /* shade with distant light source */
+ if ( Nx == 0 && Ny == 0 )
+ shade = Filter.bg;
+ else if ( (NdotL = Nx * Filter.Lx + Ny * Filter.Ly + Filter.NzLz) < 0 )
+ shade = 0;
+ else
+ shade = NdotL / sqrt(Nx*Nx + Ny*Ny + Filter.Nz2);
+
+ /* do something with the shading result */
+ if (texture)
+ {
+ for (b = 0; b < bytes; b++)
+ *dst++ = (*texture++ * shade) >> 8;
+
+ if (alpha)
+ {
+ *dst++ = s[1][bypp + bytes]; /* preserve the alpha */
+ texture++;
+ }
+ }
+ else
+ {
+ for (b = 0; b < bytes; b++)
+ *dst++ = shade;
+
+ if (alpha)
+ *dst++ = s[1][bypp + bytes]; /* preserve the alpha */
+ }
+
+ for (i = 0; i < 3; i++)
+ s[i] += bypp;
+ }
+
+ if (texture)
+ texture += bypp;
+}
+
+static void
+emboss (GimpDrawable *drawable,
+ GimpPreview *preview)
+{
+ GimpPixelRgn src, dst;
+ gint p_update;
+ gint y;
+ gint x1, y1, x2, y2;
+ gint width, height;
+ gint bypp, rowsize;
+ gboolean has_alpha;
+ guchar *srcbuf, *dstbuf;
+
+ if (preview)
+ {
+ gimp_preview_get_position (preview, &x1, &y1);
+ gimp_preview_get_size (preview, &width, &height);
+ x2 = x1 + width;
+ y2 = y1 + height;
+ }
+ else
+ {
+ if (! gimp_drawable_mask_intersect (drawable->drawable_id,
+ &x1, &y1, &width, &height))
+ return;
+
+ /* expand the bounds a little */
+ x1 = MAX (0, x1 - evals.depth);
+ y1 = MAX (0, y1 - evals.depth);
+ x2 = MIN (drawable->width, x1 + width + evals.depth);
+ y2 = MIN (drawable->height, y1 + height + evals.depth);
+
+ width = x2 - x1;
+ height = y2 - y1;
+ }
+
+ bypp = drawable->bpp;
+ p_update = MAX (1, height / 20);
+ rowsize = width * bypp;
+ has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
+
+ gimp_pixel_rgn_init (&src, drawable,
+ x1, y1, width, height,
+ FALSE, FALSE);
+ gimp_pixel_rgn_init (&dst, drawable,
+ x1, y1, width, height,
+ preview == NULL, TRUE);
+
+ srcbuf = g_new0 (guchar, rowsize * 3);
+ dstbuf = g_new0 (guchar, rowsize);
+
+ emboss_init (DtoR(evals.azimuth), DtoR(evals.elevation), evals.depth);
+ if (!preview)
+ gimp_progress_init (_("Emboss"));
+
+ /* first row */
+ gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y1, width, 3);
+ memcpy (srcbuf, srcbuf + rowsize, rowsize);
+ emboss_row (srcbuf, evals.embossp ? NULL : srcbuf,
+ dstbuf, width, bypp, has_alpha);
+ gimp_pixel_rgn_set_row (&dst, dstbuf, 0, 0, width);
+
+ /* middle rows */
+ for (y = 0; y < height - 2; y++)
+ {
+ if (! preview && (y % p_update == 0))
+ gimp_progress_update ((gdouble) y / (gdouble) height);
+
+ gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y1 + y, width, 3);
+ emboss_row (srcbuf, evals.embossp ? NULL : srcbuf,
+ dstbuf, width, bypp, has_alpha);
+ gimp_pixel_rgn_set_row (&dst, dstbuf, x1, y1 + y + 1, width);
+ }
+
+ /* last row */
+ gimp_pixel_rgn_get_rect (&src, srcbuf, x1, y2 - 3, width, 3);
+ memcpy (srcbuf + rowsize * 2, srcbuf + rowsize, rowsize);
+ emboss_row (srcbuf, evals.embossp ? NULL : srcbuf,
+ dstbuf, width, bypp, has_alpha);
+ gimp_pixel_rgn_set_row (&dst, dstbuf, x1, y2 - 1, width);
+
+ if (preview)
+ {
+ gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
+ &dst);
+ }
+ else
+ {
+ gimp_progress_update (1.0);
+
+ gimp_drawable_flush (drawable);
+ gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
+ gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
+ gimp_displays_flush ();
+ }
+
+ g_free (srcbuf);
+ g_free (dstbuf);
+}
+
+static gboolean
+emboss_dialog (GimpDrawable *drawable)
+{
+ GtkWidget *dialog;
+ GtkWidget *main_vbox;
+ GtkWidget *preview;
+ GtkWidget *radio1;
+ GtkWidget *radio2;
+ GtkWidget *frame;
+ GtkWidget *table;
+ GtkObject *adj;
+ gboolean run;
+
+ gimp_ui_init (PLUG_IN_BINARY, TRUE);
+
+ dialog = gimp_dialog_new (_("Emboss"), 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 (emboss),
+ drawable);
+
+ frame = gimp_int_radio_group_new (TRUE, _("Function"),
+ G_CALLBACK (gimp_radio_button_update),
+ &evals.embossp, evals.embossp,
+
+ _("_Bumpmap"), FUNCTION_BUMPMAP, &radio1,
+ _("_Emboss"), FUNCTION_EMBOSS, &radio2,
+
+ NULL);
+
+ gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+ gtk_widget_show (frame);
+
+ g_signal_connect_swapped (radio1, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+ g_signal_connect_swapped (radio2, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ table = gtk_table_new (3, 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);
+
+ adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
+ _("_Azimuth:"), 100, 6,
+ evals.azimuth, 0.0, 360.0, 1.0, 10.0, 2,
+ TRUE, 0, 0,
+ NULL, NULL);
+ g_signal_connect (adj, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &evals.azimuth);
+ g_signal_connect_swapped (adj, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
+ _("E_levation:"), 100, 6,
+ evals.elevation, 0.0, 180.0, 1.0, 10.0, 2,
+ TRUE, 0, 0,
+ NULL, NULL);
+ g_signal_connect (adj, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &evals.elevation);
+ g_signal_connect_swapped (adj, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
+ _("_Depth:"), 100, 6,
+ evals.depth, 1.0, 100.0, 1.0, 5.0, 0,
+ TRUE, 0, 0,
+ NULL, NULL);
+ g_signal_connect (adj, "value-changed",
+ G_CALLBACK (gimp_int_adjustment_update),
+ &evals.depth);
+ g_signal_connect_swapped (adj, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ gtk_widget_show (table);
+
+ gtk_widget_show (dialog);
+
+ run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
+
+ gtk_widget_destroy (dialog);
+
+ if (run)
+ emboss (drawable, NULL);
+
+ return run;
+}
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