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276ec82df5
More fixes to the rotation code. It really works well now. Now we need to fix the "clipping when rotating" problem if it is a real issue. Mark
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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* gdk-pixbuf.c: Resource management.
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*
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* Authors:
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* Miguel de Icaza (miguel@gnu.org)
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* Mark Crichton (crichton@gimp.org)
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*/
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#include <config.h>
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#include <glib.h>
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#include <math.h>
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#include <libart_lgpl/art_misc.h>
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#include <libart_lgpl/art_rgb_affine.h>
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#include <libart_lgpl/art_alphagamma.h>
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#include "gdk-pixbuf.h"
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void
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gdk_pixbuf_destroy (GdkPixBuf *pixbuf)
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{
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art_pixbuf_free (pixbuf->art_pixbuf);
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g_free (pixbuf);
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}
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void
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gdk_pixbuf_ref (GdkPixBuf *pixbuf)
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{
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g_return_if_fail (pixbuf != NULL);
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pixbuf->ref_count++;
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}
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void
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gdk_pixbuf_unref (GdkPixBuf *pixbuf)
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{
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g_return_if_fail (pixbuf != NULL);
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g_return_if_fail (pixbuf->ref_count == 0);
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pixbuf->ref_count--;
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if (pixbuf->ref_count)
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gdk_pixbuf_destroy (pixbuf);
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}
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GdkPixBuf *
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gdk_pixbuf_scale (GdkPixBuf *pixbuf, gint w, gint h)
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{
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GdkPixBuf *spb;
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art_u8 *pixels;
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gint rowstride;
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double affine[6];
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ArtAlphaGamma *alphagamma;
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ArtPixBuf *art_pixbuf = NULL;
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alphagamma = NULL;
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affine[1] = affine[2] = affine[4] = affine[5] = 0;
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affine[0] = w / (double)(pixbuf->art_pixbuf->width);
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affine[3] = h / (double)(pixbuf->art_pixbuf->height);
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/* rowstride = w * pixbuf->art_pixbuf->n_channels; */
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rowstride = w * 3;
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pixels = art_alloc (h * rowstride);
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art_rgb_pixbuf_affine( pixels, 0, 0, w, h, rowstride,
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pixbuf->art_pixbuf,
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affine, ART_FILTER_NEAREST, alphagamma);
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if (pixbuf->art_pixbuf->has_alpha)
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/* should be rgba */
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art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
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else
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art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
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art_pixbuf_free (pixbuf->art_pixbuf);
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pixbuf->art_pixbuf = art_pixbuf;
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return pixbuf;
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}
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GdkPixBuf *
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gdk_pixbuf_rotate (GdkPixBuf *pixbuf, gdouble angle)
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{
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GdkPixBuf *rotate;
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art_u8 *pixels;
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gint rowstride, w, h;
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gdouble rad;
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double rot[6], trans[6], affine[6];
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ArtAlphaGamma *alphagamma = NULL;
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ArtPixBuf *art_pixbuf = NULL;
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w = pixbuf->art_pixbuf->width;
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h = pixbuf->art_pixbuf->height;
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rad = (M_PI * angle / 180.0);
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rot[0] = cos(rad);
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rot[1] = sin(rad);
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rot[2] = -sin(rad);
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rot[3] = cos(rad);
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rot[4] = rot[5] = 0;
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trans[0] = trans[3] = 1;
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trans[1] = trans[2] = 0;
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trans[4] = -(double)w / 2.0;
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trans[5] = -(double)h / 2.0;
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art_affine_multiply(rot, trans, rot);
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trans[0] = trans[3] = 1;
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trans[1] = trans[2] = 0;
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trans[4] = (double)w / 2.0;
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trans[5] = (double)h / 2.0;
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art_affine_multiply(affine, rot, trans);
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g_print("Affine: %e %e %e %e %e %e\n", affine[0], affine[1], affine[2],
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affine[3], affine[4], affine[5]);
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/* rowstride = w * pixbuf->art_pixbuf->n_channels; */
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rowstride = w * 3;
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pixels = art_alloc (h * rowstride);
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art_rgb_pixbuf_affine (pixels, 0, 0, w, h, rowstride,
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pixbuf->art_pixbuf,
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affine, ART_FILTER_NEAREST, alphagamma);
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if (pixbuf->art_pixbuf->has_alpha)
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/* should be rgba */
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art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
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else
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art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, rowstride);
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art_pixbuf_free (pixbuf->art_pixbuf);
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pixbuf->art_pixbuf = art_pixbuf;
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return pixbuf;
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}
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