2 * gdk-pixbuf.c: Resource management.
5 * Miguel de Icaza (miguel@gnu.org)
6 * Mark Crichton (crichton@gimp.org)
12 #include <libart_lgpl/art_misc.h>
13 #include <libart_lgpl/art_affine.h>
14 #include <libart_lgpl/art_pixbuf.h>
15 #include <libart_lgpl/art_rgb_pixbuf_affine.h>
16 #include <libart_lgpl/art_alphagamma.h>
17 #include "gdk-pixbuf.h"
21 gdk_pixbuf_destroy (GdkPixBuf *pixbuf)
23 art_pixbuf_free (pixbuf->art_pixbuf);
24 pixbuf->art_pixbuf = NULL;
29 gdk_pixbuf_new (ArtPixBuf *art_pixbuf,
30 GdkPixBufUnrefFunc *unref_fn)
37 pixbuf = g_new (GdkPixBuf, 1);
38 pixbuf->ref_count = 1;
39 pixbuf->unref_fn = unref_fn;
40 pixbuf->art_pixbuf = art_pixbuf;
46 gdk_pixbuf_ref (GdkPixBuf *pixbuf)
48 g_return_if_fail (pixbuf != NULL);
49 g_return_if_fail (pixbuf->ref_count > 0);
55 gdk_pixbuf_unref (GdkPixBuf *pixbuf)
57 g_return_if_fail (pixbuf != NULL);
58 g_return_if_fail (pixbuf->ref_count > 0);
62 if (pixbuf->ref_count == 0)
63 gdk_pixbuf_destroy (pixbuf);
67 gdk_pixbuf_scale (const GdkPixBuf *pixbuf, gint w, gint h)
72 ArtAlphaGamma *alphagamma;
73 ArtPixBuf *art_pixbuf = NULL;
74 GdkPixBuf *copy = NULL;
78 affine[1] = affine[2] = affine[4] = affine[5] = 0;
80 affine[0] = w / (double)(pixbuf->art_pixbuf->width);
81 affine[3] = h / (double)(pixbuf->art_pixbuf->height);
83 /* rowstride = w * pixbuf->art_pixbuf->n_channels; */
86 pixels = art_alloc (h * rowstride);
87 art_rgb_pixbuf_affine (pixels, 0, 0, w, h, rowstride,
89 affine, ART_FILTER_NEAREST, alphagamma);
91 if (pixbuf->art_pixbuf->has_alpha)
93 art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
95 art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
97 copy = gdk_pixbuf_new (art_pixbuf, NULL);
106 gdk_pixbuf_duplicate (const GdkPixBuf *pixbuf)
108 GdkPixBuf *copy = g_new (GdkPixBuf, 1);
111 copy->unref_fn = pixbuf->unref_fn;
112 copy->art_pixbuf = art_pixbuf_duplicate (pixbuf->art_pixbuf);
118 gdk_pixbuf_rotate (GdkPixBuf *pixbuf, gdouble angle)
121 gint rowstride, w, h;
123 double rot[6], trans[6], affine[6];
124 ArtAlphaGamma *alphagamma = NULL;
125 ArtPixBuf *art_pixbuf = NULL;
127 w = pixbuf->art_pixbuf->width;
128 h = pixbuf->art_pixbuf->height;
130 rad = (M_PI * angle / 180.0);
138 trans[0] = trans[3] = 1;
139 trans[1] = trans[2] = 0;
140 trans[4] = -(double)w / 2.0;
141 trans[5] = -(double)h / 2.0;
143 art_affine_multiply(rot, trans, rot);
145 trans[0] = trans[3] = 1;
146 trans[1] = trans[2] = 0;
147 trans[4] = (double)w / 2.0;
148 trans[5] = (double)h / 2.0;
150 art_affine_multiply(affine, rot, trans);
152 g_print("Affine: %e %e %e %e %e %e\n", affine[0], affine[1], affine[2],
153 affine[3], affine[4], affine[5]);
155 /* rowstride = w * pixbuf->art_pixbuf->n_channels; */
158 pixels = art_alloc (h * rowstride);
159 art_rgb_pixbuf_affine (pixels, 0, 0, w, h, rowstride,
161 affine, ART_FILTER_NEAREST, alphagamma);
162 if (pixbuf->art_pixbuf->has_alpha)
164 art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
166 art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
168 art_pixbuf_free (pixbuf->art_pixbuf);
169 pixbuf->art_pixbuf = art_pixbuf;