From 59dc3d29a1edf73cf54f10ee32d61815a437619f Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Tue, 13 Apr 2010 17:04:31 -0400 Subject: New canvas pigment (image map). --- libdimension/canvas_pigment.c | 58 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 libdimension/canvas_pigment.c (limited to 'libdimension/canvas_pigment.c') diff --git a/libdimension/canvas_pigment.c b/libdimension/canvas_pigment.c new file mode 100644 index 0000000..b4c6823 --- /dev/null +++ b/libdimension/canvas_pigment.c @@ -0,0 +1,58 @@ +/************************************************************************* + * Copyright (C) 2010 Tavian Barnes * + * * + * This file is part of The Dimension Library. * + * * + * The Dimension Library is free software; you can redistribute it and/ * + * or modify it under the terms of the GNU Lesser General Public License * + * as published by the Free Software Foundation; either version 3 of the * + * License, or (at your option) any later version. * + * * + * The Dimension Library 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 * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this program. If not, see * + * . * + *************************************************************************/ + +#include "dimension.h" + +/* Canvas color pigment callback */ +static dmnsn_color dmnsn_canvas_pigment_fn(const dmnsn_pigment *pigment, + dmnsn_vector v); +static void dmnsn_canvas_pigment_free_fn(void *ptr); + +/* Create a canvas color */ +dmnsn_pigment * +dmnsn_new_canvas_pigment(dmnsn_canvas *canvas) +{ + dmnsn_pigment *pigment = dmnsn_new_pigment(); + pigment->pigment_fn = &dmnsn_canvas_pigment_fn; + pigment->free_fn = &dmnsn_canvas_pigment_free_fn; + pigment->ptr = canvas; + return pigment; +} + +/* Canvas color callback */ +static dmnsn_color +dmnsn_canvas_pigment_fn(const dmnsn_pigment *pigment, dmnsn_vector v) +{ + dmnsn_canvas *canvas = pigment->ptr; + + int x = v.x*(canvas->x - 1) + 0.5; + int y = v.x*(canvas->x - 1) + 0.5; + if (x >= 0 && y >= 0 && x < canvas->x && y < canvas->y) { + return dmnsn_get_pixel(canvas, x, y); + } else { + return dmnsn_black; + } +} + +static void +dmnsn_canvas_pigment_free_fn(void *ptr) +{ + dmnsn_delete_canvas(ptr); +} -- cgit v1.2.3