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/* -*- mode: c; c-basic-offset: 4; -*-
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* image-fu.h - Imaging utilities for manipulating GdkPixbufs
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* Fyre - rendering and interactive exploration of chaotic functions
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* Copyright (C) 2004-2005 David Trowbridge and Micah Dowty
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* 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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#ifndef __IMAGE_FU_H__
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#define __IMAGE_FU_H__
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/* Convert an ARGB color to a packed guint32 */
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#define IMAGEFU_COLOR(a,r,g,b) (GUINT32_TO_LE(((a)<<24) | ((b)<<16) | ((g)<<8) | (r)))
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/* This must be a power of two. It's hardcoded in image_add_checkerboard
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* for speed, but it might be needed for calculations elsewhere.
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#define CHECKERBOARD_TILE_SIZE 8
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/* Do an in-place composite on a GdkPixbuf to render it in front of a checkerboard pattern */
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void image_add_checkerboard(GdkPixbuf *img);
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/* Orthogonal line drawing */
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void image_draw_hline(GdkPixbuf *img, int x, int y, int width, guint32 color);
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void image_draw_vline(GdkPixbuf *img, int x, int y, int height, guint32 color);
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void image_draw_rect_outline(GdkPixbuf *img, int x, int y, int w, int h, guint32 color);
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/* Modify an image in-place to include a thin frame */
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void image_add_thumbnail_frame(GdkPixbuf *img);
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/* Adjust an image's levels automatically, to make faint images more visible.
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* This runs on RGBA images, but ignores the alpha channel.
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void image_adjust_levels(GdkPixbuf *img);
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#endif /* __IMAGE_FU_H__ */
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src/image-fu.h
