/* handy.c * These routines are useful for working with the GIMP and need not be * specific to plug-in-maze. * * Kevin Turner * http://www.poboxes.com/kevint/gimp/maze.html */ /* * 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., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include #include "libgimp/gimp.h" /* get_colors Returns the current foreground and background colors in nice little arrays. It works nicely for RGB and grayscale images, however handling of indexed images is somewhat broken. Patches appreciated. */ void get_colors (GDrawable * drawable, guint8 *fg, guint8 *bg); /* drawbox draws a solid colored box in a GPixelRgn, hopefully fairly quickly. See comments below. */ void drawbox (GPixelRgn *dest_rgn, guint x, guint y, guint w, guint h, guint8 clr[4]); void get_colors (GDrawable *drawable, guint8 *fg, guint8 *bg) { GParam *return_vals; gint nreturn_vals; switch ( gimp_drawable_type (drawable->id) ) { case RGBA_IMAGE: /* ASSUMPTION: Assuming the user wants entire */ fg[3] = 255; /* area to be fully opaque. */ bg[3] = 255; case RGB_IMAGE: return_vals = gimp_run_procedure ("gimp_palette_get_foreground", &nreturn_vals, PARAM_END); if (return_vals[0].data.d_status == STATUS_SUCCESS) { fg[0] = return_vals[1].data.d_color.red; fg[1] = return_vals[1].data.d_color.green; fg[2] = return_vals[1].data.d_color.blue; } else { fg[0] = 255; fg[1] = 255; fg[2] = 255; } return_vals = gimp_run_procedure ("gimp_palette_get_background", &nreturn_vals, PARAM_END); if (return_vals[0].data.d_status == STATUS_SUCCESS) { bg[0] = return_vals[1].data.d_color.red; bg[1] = return_vals[1].data.d_color.green; bg[2] = return_vals[1].data.d_color.blue; } else { bg[0] = 0; bg[1] = 0; bg[2] = 0; } break; case GRAYA_IMAGE: /* and again */ fg[1] = 255; bg[1] = 255; case GRAY_IMAGE: return_vals = gimp_run_procedure ("gimp_palette_get_foreground", &nreturn_vals, PARAM_END); if (return_vals[0].data.d_status == STATUS_SUCCESS) { fg[0] = 0.30 * return_vals[1].data.d_color.red + 0.59 * return_vals[1].data.d_color.green + 0.11 * return_vals[1].data.d_color.blue; } else { fg[0] = 255; } return_vals = gimp_run_procedure ("gimp_palette_get_background", &nreturn_vals, PARAM_END); if (return_vals[0].data.d_status == STATUS_SUCCESS) { bg[0] = 0.30 * return_vals[1].data.d_color.red + 0.59 * return_vals[1].data.d_color.green + 0.11 * return_vals[1].data.d_color.blue; } else { bg[0] = 0; } break; case INDEXEDA_IMAGE: case INDEXED_IMAGE: /* FIXME: Should use current fg/bg colors. */ g_warning("maze: get_colors: Indexed image. Using colors 15 and 0.\n"); fg[0] = 15; /* As a plugin, I protest. *I* shouldn't be the */ bg[0] = 0; /* one who has to deal with this colormapcrap. */ break; default: break; } } /* Draws a solid color box in a GPixelRgn. */ /* Optimization assumptions: * (Or, "Why Maze is Faster Than Checkerboard.") * * Assuming calling memcpy is faster than using loops. * Row buffers are nice... * * Assume allocating memory for row buffers takes a significant amount * of time. Assume drawbox will be called many times. * Only allocate memory once. * * Do not assume the row buffer will always be the same size. Allow * for reallocating to make it bigger if needed. However, I don't see * reason to bother ever shrinking it again. * (Under further investigation, assuming the row buffer never grows * may be a safe assumption in this case.) * * Also assume that the program calling drawbox is short-lived, so * memory leaks aren't of particular concern-- the memory allocated to * the row buffer is never set free. */ /* Further optimizations that could be made... * Currently, the row buffer is re-filled with every call. However, * plug-ins such as maze and checkerboard only use two colors, and * for the most part, have rows of the same size with every call. * We could keep a row of each color on hand so we wouldn't have to * re-fill it every time... */ void drawbox( GPixelRgn *dest_rgn, guint x, guint y, guint w, guint h, guint8 clr[4]) { guint xx, yy, y_max, x_min /*, x_max */; static guint8 *rowbuf; guint rowsize; static guint high_size=0; /* The maximum [xy] value is that of the far end of the box, or * the edge of the region, whichever comes first. */ y_max = dest_rgn->rowstride * MIN(dest_rgn->h, (y + h)); /* x_max = dest_rgn->bpp * MIN(dest_rgn->w, (x + w)); */ x_min = x * dest_rgn->bpp; /* rowsize = x_max - x_min */ rowsize = dest_rgn->bpp * MIN(dest_rgn->w, (x + w)) - x_min; /* Does the row buffer need to be (re)allocated? */ if (high_size == 0) { rowbuf = g_new(guint8, rowsize); } else if (rowsize > high_size) { g_realloc(rowbuf, rowsize * sizeof(guint8) ); } high_size = MAX(high_size, rowsize); /* Fill the row buffer with the color. */ for (xx= 0; xx < rowsize; xx+= dest_rgn->bpp) { memcpy (&rowbuf[xx], clr, dest_rgn->bpp); } /* next xx */ /* Fill in the box in the region with rows... */ for (yy = dest_rgn->rowstride * y; yy < y_max; yy += dest_rgn->rowstride ) { memcpy (&dest_rgn->data[yy+x_min], rowbuf, rowsize); } /* next yy */ } /* Alternate ways of doing things if you don't like memcpy. */ #if 0 for (xx= x * dest_rgn->bpp; xx < bar; xx+= dest_rgn->bpp) { #if 0 for (bp=0; bp < dest_rgn->bpp; bp++) { dest_rgn->data[yy+xx+bp]=clr[bp]; } /* next bp */ #else memcpy (&dest_rgn->data[yy+xx], clr, dest_rgn->bpp); #endif } /* next xx */ } /* next yy */ } #endif