| 1 | /* sxiv: image.c |
| 2 | * Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <stdio.h> |
| 21 | |
| 22 | #include <Imlib2.h> |
| 23 | |
| 24 | #include "sxiv.h" |
| 25 | #include "image.h" |
| 26 | |
| 27 | int zl_cnt; |
| 28 | float zoom_min; |
| 29 | float zoom_max; |
| 30 | |
| 31 | void imlib_init(win_t *win) { |
| 32 | if (!win) |
| 33 | return; |
| 34 | |
| 35 | imlib_context_set_display(win->env.dpy); |
| 36 | imlib_context_set_visual(win->env.vis); |
| 37 | imlib_context_set_colormap(win->env.cmap); |
| 38 | |
| 39 | zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]); |
| 40 | zoom_min = zoom_levels[0] / 100.0; |
| 41 | zoom_max = zoom_levels[zl_cnt - 1] / 100.0; |
| 42 | } |
| 43 | |
| 44 | void imlib_destroy() { |
| 45 | if (imlib_context_get_image()) |
| 46 | imlib_free_image(); |
| 47 | } |
| 48 | |
| 49 | int img_load(img_t *img, const char *filename) { |
| 50 | Imlib_Image *im; |
| 51 | |
| 52 | if (!img || !filename) |
| 53 | return -1; |
| 54 | |
| 55 | if (imlib_context_get_image()) |
| 56 | imlib_free_image(); |
| 57 | |
| 58 | if (!(im = imlib_load_image(filename))) { |
| 59 | WARN("could not open image: %s", filename); |
| 60 | return -1; |
| 61 | } |
| 62 | |
| 63 | imlib_context_set_image(im); |
| 64 | |
| 65 | img->re = 0; |
| 66 | img->w = imlib_image_get_width(); |
| 67 | img->h = imlib_image_get_height(); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | void img_check_pan(img_t *img, win_t *win) { |
| 73 | if (!img) |
| 74 | return; |
| 75 | |
| 76 | if (img->w * img->zoom > win->w) { |
| 77 | if (img->x > 0 && img->x + img->w * img->zoom > win->w) |
| 78 | img->x = 0; |
| 79 | if (img->x < 0 && img->x + img->w * img->zoom < win->w) |
| 80 | img->x = win->w - img->w * img->zoom; |
| 81 | } else { |
| 82 | img->x = (win->w - img->w * img->zoom) / 2; |
| 83 | } |
| 84 | if (img->h * img->zoom > win->h) { |
| 85 | if (img->y > 0 && img->y + img->h * img->zoom > win->h) |
| 86 | img->y = 0; |
| 87 | if (img->y < 0 && img->y + img->h * img->zoom < win->h) |
| 88 | img->y = win->h - img->h * img->zoom; |
| 89 | } else { |
| 90 | img->y = (win->h - img->h * img->zoom) / 2; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | void img_render(img_t *img, win_t *win) { |
| 95 | int sx, sy, sw, sh; |
| 96 | int dx, dy, dw, dh; |
| 97 | float zw, zh; |
| 98 | |
| 99 | if (!img || !win || !imlib_context_get_image()) |
| 100 | return; |
| 101 | |
| 102 | if (!img->re) { |
| 103 | /* rendered for the first time */ |
| 104 | img->re = 1; |
| 105 | |
| 106 | /* set zoom level to fit image into window */ |
| 107 | if (img->scalemode != SCALE_ZOOM) { |
| 108 | zw = (float) win->w / (float) img->w; |
| 109 | zh = (float) win->h / (float) img->h; |
| 110 | img->zoom = MIN(zw, zh); |
| 111 | |
| 112 | if (img->zoom < zoom_min) |
| 113 | img->zoom = zoom_min; |
| 114 | else if (img->zoom > zoom_max) |
| 115 | img->zoom = zoom_max; |
| 116 | |
| 117 | if (img->scalemode == SCALE_DOWN && img->zoom > 1.0) |
| 118 | img->zoom = 1.0; |
| 119 | } |
| 120 | |
| 121 | /* center image in window */ |
| 122 | img->x = (win->w - img->w * img->zoom) / 2; |
| 123 | img->y = (win->h - img->h * img->zoom) / 2; |
| 124 | } else { |
| 125 | /* typically after zooming and panning */ |
| 126 | img_check_pan(img, win); |
| 127 | } |
| 128 | |
| 129 | if (img->x < 0) { |
| 130 | sx = -img->x / img->zoom; |
| 131 | sw = win->w / img->zoom; |
| 132 | dx = 0; |
| 133 | dw = win->w; |
| 134 | } else { |
| 135 | sx = 0; |
| 136 | sw = img->w; |
| 137 | dx = img->x; |
| 138 | dw = img->w * img->zoom; |
| 139 | } |
| 140 | if (img->y < 0) { |
| 141 | sy = -img->y / img->zoom; |
| 142 | sh = win->h / img->zoom; |
| 143 | dy = 0; |
| 144 | dh = win->h; |
| 145 | } else { |
| 146 | sy = 0; |
| 147 | sh = img->h; |
| 148 | dy = img->y; |
| 149 | dh = img->h * img->zoom; |
| 150 | } |
| 151 | |
| 152 | win_clear(win); |
| 153 | |
| 154 | imlib_context_set_drawable(win->pm); |
| 155 | imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh); |
| 156 | |
| 157 | win_draw(win); |
| 158 | } |
| 159 | |
| 160 | int img_zoom(img_t *img, float z) { |
| 161 | if (!img) |
| 162 | return 0; |
| 163 | |
| 164 | if (z < zoom_min) |
| 165 | z = zoom_min; |
| 166 | else if (z > zoom_max) |
| 167 | z = zoom_max; |
| 168 | |
| 169 | if (z != img->zoom) { |
| 170 | img->x -= (img->w * z - img->w * img->zoom) / 2; |
| 171 | img->y -= (img->h * z - img->h * img->zoom) / 2; |
| 172 | img->zoom = z; |
| 173 | return 1; |
| 174 | } else { |
| 175 | return 0; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | int img_zoom_in(img_t *img) { |
| 180 | int i; |
| 181 | |
| 182 | if (!img) |
| 183 | return 0; |
| 184 | |
| 185 | for (i = 1; i < zl_cnt; ++i) { |
| 186 | if (zoom_levels[i] > img->zoom * 100.0) |
| 187 | return img_zoom(img, zoom_levels[i] / 100.0); |
| 188 | } |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | int img_zoom_out(img_t *img) { |
| 194 | int i; |
| 195 | |
| 196 | if (!img) |
| 197 | return 0; |
| 198 | |
| 199 | for (i = zl_cnt - 2; i >= 0; --i) { |
| 200 | if (zoom_levels[i] < img->zoom * 100.0) |
| 201 | return img_zoom(img, zoom_levels[i] / 100.0); |
| 202 | } |
| 203 | |
| 204 | return 0; |
| 205 | } |