mirror of https://github.com/GNOME/gimp.git
338 lines
7.5 KiB
C
338 lines
7.5 KiB
C
/*
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* Autocrop plug-in version 1.00
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* by Tim Newsome <drz@froody.bloke.com>
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* thanks to quartic for finding a nasty bug for me
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*/
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/* 1999/04/09 -- Sven Neumann <sven@gimp.org>
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* Fixed bad crash that occured when running on an entirely blank image.
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* Cleaned up the code a bit, while I was at it.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <libgimp/gimp.h>
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#include "libgimp/stdplugins-intl.h"
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/* Declare local functions. */
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static void query (void);
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static void run (gchar *name,
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gint nparams,
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GimpParam *param,
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gint *nreturn_vals,
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GimpParam **return_vals);
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static gint colors_equal (guchar *col1,
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guchar *col2,
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gint bytes);
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static gint guess_bgcolor (GimpPixelRgn *pr,
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gint width,
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gint height,
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gint bytes,
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guchar *color);
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static void doit (GimpDrawable *drawable,
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gint32 image_id,
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gboolean show_progress);
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GimpPlugInInfo PLUG_IN_INFO =
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{
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NULL, /* init_proc */
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NULL, /* quit_proc */
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query, /* query_proc */
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run, /* run_proc */
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};
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static gint bytes;
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MAIN ()
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static void
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query (void)
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{
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static GimpParamDef args[] =
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{
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{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
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{ GIMP_PDB_IMAGE, "image", "Input image" },
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{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
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};
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gimp_install_procedure ("plug_in_autocrop",
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"Automagically crops a picture.",
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"",
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"Tim Newsome",
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"Tim Newsome",
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"1997",
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N_("<Image>/Image/Transform/Autocrop"),
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"RGB*, GRAY*, INDEXED*",
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GIMP_PLUGIN,
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G_N_ELEMENTS (args), 0,
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args, NULL);
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}
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static void
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run (gchar *name,
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gint n_params,
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GimpParam *param,
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gint *nreturn_vals,
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GimpParam **return_vals)
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{
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static GimpParam values[1];
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GimpDrawable *drawable;
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GimpRunMode run_mode;
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GimpPDBStatusType status = GIMP_PDB_SUCCESS;
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gint32 image_id;
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gboolean interactive;
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*nreturn_vals = 1;
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*return_vals = values;
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run_mode = param[0].data.d_int32;
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interactive = (run_mode != GIMP_RUN_NONINTERACTIVE);
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INIT_I18N();
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if (n_params != 3)
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{
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status = GIMP_PDB_CALLING_ERROR;
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goto out;
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}
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/* Get the specified drawable */
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drawable = gimp_drawable_get (param[2].data.d_drawable);
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image_id = param[1].data.d_image;
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/* Make sure that the drawable is gray or RGB color */
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if (gimp_drawable_is_rgb (drawable->drawable_id) ||
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gimp_drawable_is_gray (drawable->drawable_id) ||
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gimp_drawable_is_indexed (drawable->drawable_id))
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{
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if (interactive)
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gimp_progress_init (_("Cropping..."));
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gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width() + 1));
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doit (drawable, image_id, interactive);
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if (interactive)
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gimp_displays_flush ();
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}
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else
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{
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status = GIMP_PDB_EXECUTION_ERROR;
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}
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out:
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values[0].type = GIMP_PDB_STATUS;
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values[0].data.d_status = status;
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}
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static void
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doit (GimpDrawable *drawable,
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gint32 image_id,
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gboolean show_progress)
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{
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GimpPixelRgn srcPR;
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gint width, height;
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gint x, y, abort;
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gint32 nx, ny, nw, nh;
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guchar *buffer;
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guchar color[4] = {0, 0, 0, 0};
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width = drawable->width;
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height = drawable->height;
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bytes = drawable->bpp;
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nx = 0;
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ny = 0;
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nw = width;
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nh = height;
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/* initialize the pixel regions */
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gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
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/* First, let's figure out what exactly to crop. */
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buffer = g_malloc ((width > height ? width : height) * bytes);
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guess_bgcolor (&srcPR, width, height, bytes, color);
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/* Check how many of the top lines are uniform. */
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abort = 0;
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for (y = 0; y < height && !abort; y++)
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{
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gimp_pixel_rgn_get_row (&srcPR, buffer, 0, y, width);
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for (x = 0; x < width && !abort; x++)
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{
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abort = !colors_equal (color, buffer + x * bytes, bytes);
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}
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}
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if (y == height && !abort)
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{
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g_free (buffer);
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gimp_drawable_detach (drawable);
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return;
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}
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y--;
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ny = y;
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nh = height - y;
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if (show_progress)
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gimp_progress_update (0.25);
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/* Check how many of the bottom lines are uniform. */
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abort = 0;
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for (y = height - 1; y >= 0 && !abort; y--)
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{
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gimp_pixel_rgn_get_row (&srcPR, buffer, 0, y, width);
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for (x = 0; x < width && !abort; x++)
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{
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abort = !colors_equal (color, buffer + x * bytes, bytes);
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}
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}
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nh = y - ny + 2;
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if (show_progress)
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gimp_progress_update (0.5);
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/* Check how many of the left lines are uniform. */
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abort = 0;
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for (x = 0; x < width && !abort; x++)
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{
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gimp_pixel_rgn_get_col (&srcPR, buffer, x, ny, nh);
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for (y = 0; y < nh && !abort; y++)
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{
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abort = !colors_equal (color, buffer + y * bytes, bytes);
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}
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}
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x--;
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nx = x;
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nw = width - x;
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if (show_progress)
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gimp_progress_update (0.75);
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/* Check how many of the right lines are uniform. */
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abort = 0;
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for (x = width - 1; x >= 0 && !abort; x--)
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{
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gimp_pixel_rgn_get_col (&srcPR, buffer, x, ny, nh);
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for (y = 0; y < nh && !abort; y++)
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{
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abort = !colors_equal (color, buffer + y * bytes, bytes);
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}
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}
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nw = x - nx + 2;
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g_free (buffer);
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gimp_drawable_detach (drawable);
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if (nw != width || nh != height)
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gimp_image_crop (image_id, nw, nh, nx, ny);
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if (show_progress)
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gimp_progress_update (1.00);
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}
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static gint
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guess_bgcolor (GimpPixelRgn *pr,
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gint width,
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gint height,
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gint bytes,
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guchar *color)
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{
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guchar tl[4], tr[4], bl[4], br[4];
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gimp_pixel_rgn_get_pixel (pr, tl, 0, 0);
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gimp_pixel_rgn_get_pixel (pr, tr, width - 1, 0);
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gimp_pixel_rgn_get_pixel (pr, bl, 0, height - 1);
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gimp_pixel_rgn_get_pixel (pr, br, width - 1, height - 1);
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/* Algorithm pinched from pnmcrop.
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* To guess the background, first see if 3 corners are equal.
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* Then if two are equal.
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* Otherwise average the colors.
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*/
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if (colors_equal (tr, bl, bytes) && colors_equal (tr, br, bytes))
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{
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memcpy (color, tr, bytes);
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return 3;
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}
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else if (colors_equal (tl, bl, bytes) && colors_equal (tl, br, bytes))
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{
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memcpy (color, tl, bytes);
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return 3;
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}
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else if (colors_equal (tl, tr, bytes) && colors_equal (tl, br, bytes))
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{
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memcpy (color, tl, bytes);
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return 3;
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}
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else if (colors_equal (tl, tr, bytes) && colors_equal (tl, bl, bytes))
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{
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memcpy (color, tl, bytes);
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return 3;
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}
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else if (colors_equal (tl, tr, bytes) || colors_equal (tl, bl, bytes) ||
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colors_equal (tl, br, bytes))
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{
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memcpy (color, tl, bytes);
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return 2;
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}
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else if (colors_equal (tr, bl, bytes) || colors_equal (tr, bl, bytes))
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{
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memcpy (color, tr, bytes);
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return 2;
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}
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else if (colors_equal (br, bl, bytes))
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{
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memcpy (color, br, bytes);
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return 2;
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}
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else
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{
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while (bytes--)
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{
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color[bytes] = (tl[bytes] + tr[bytes] + bl[bytes] + br[bytes]) / 4;
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}
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return 0;
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}
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}
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static gint
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colors_equal (guchar *col1,
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guchar *col2,
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gint bytes)
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{
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gint equal = 1;
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gint b;
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if ((bytes == 2 || bytes == 4) && /* HACK! */
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col1[bytes-1] == 0 &&
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col2[bytes-1] == 0)
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{
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return 1; /* handle zero alpha */
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}
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for (b = 0; b < bytes; b++)
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{
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if (col1[b] != col2[b])
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{
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equal = 0;
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break;
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}
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}
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return equal;
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}
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