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New functions to rotate pixbufs by multiples of 90 degrees and to flip

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Mon Jun 21 00:44:51 2004  Matthias Clasen  <maclas@gmx.de>

	* gdk-pixbuf-transform.h:
	* gdk-pixbuf-scale.c (gdk_pixbuf_rotate_simple):
	* gdk-pixbuf-scale.c (gdk_pixbuf_flip): New functions to
	rotate pixbufs by multiples of 90 degrees and to flip them
	horizontally or vertically.
This commit is contained in:
Matthias Clasen 2004-06-21 04:52:24 +00:00 committed by Matthias Clasen
parent 6b82abcbe0
commit a6b7469caf
3 changed files with 168 additions and 1 deletions
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8
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,11 @@
Mon Jun 21 00:44:51 2004 Matthias Clasen <maclas@gmx.de>
* gdk-pixbuf-transform.h:
* gdk-pixbuf-scale.c (gdk_pixbuf_rotate_simple):
* gdk-pixbuf-scale.c (gdk_pixbuf_flip): New functions to
rotate pixbufs by multiples of 90 degrees and to flip them
horizontally or vertically.
Sun Jun 20 01:06:48 2004 Matthias Clasen <maclas@gmx.de>
Header reorganization. (#51999, Jeff Franks, reorganization

148
gdk-pixbuf/gdk-pixbuf-scale.c
View File

@ -22,6 +22,7 @@
#include <config.h>
#include <math.h>
#include <string.h>
#include "gdk-pixbuf-private.h"
#include "pixops/pixops.h"
@ -305,3 +306,150 @@ gdk_pixbuf_composite_color_simple (const GdkPixbuf *src,
return dest;
}
#define OFFSET(pb, x, y) ((x) * (pb)->n_channels + (y) * (pb)->rowstride)
/**
* gdk_pixbuf_rotate_simple:
* @src: a #GdkPixbuf
* @angle: the angle to rotate by
*
* Rotates a pixbuf by a multiple of 90 degrees, and returns the
* result in a new pixbuf.
*
* Returns: a new pixbuf
*
* Since: 2.6
*/
GdkPixbuf *
gdk_pixbuf_rotate_simple (const GdkPixbuf *src,
GdkPixbufRotation angle)
{
GdkPixbuf *dest;
guchar *p, *q;
gint x, y;
switch (angle % 360)
{
case 0:
dest = gdk_pixbuf_copy (src);
break;
case 90:
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->height,
src->width);
if (!dest)
return NULL;
for (y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
p = src->pixels + OFFSET (src, x, y);
q = dest->pixels + OFFSET (dest, y, src->width - x - 1);
memcpy (q, p, dest->n_channels);
}
}
break;
case 180:
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->width,
src->height);
if (!dest)
return NULL;
for (y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
p = src->pixels + OFFSET (src, x, y);
q = dest->pixels + OFFSET (dest, src->width - x - 1, src->height - y - 1);
memcpy (q, p, dest->n_channels);
}
}
break;
case 270:
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->height,
src->width);
if (!dest)
return NULL;
for (y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
p = src->pixels + OFFSET (src, x, y);
q = dest->pixels + OFFSET (dest, src->height - y - 1, x);
memcpy (q, p, dest->n_channels);
}
}
break;
default:
g_warning ("gdk_pixbuf_rotate_simple() can only rotate "
"by multiples of 90 degrees");
g_assert_not_reached ();
}
return dest;
}
/**
* gdk_pixbuf_flip:
* @src: a #GdkPixbuf
* @horizontal: %TRUE to flip horizontally, %FALSE to flip vertically
*
* Flips a pixbuf horizontally or vertically and returns the
* result in a new pixbuf.
*
* Returns: a new pixbuf.
*
* Since: 2.6
*/
GdkPixbuf *
gdk_pixbuf_flip (const GdkPixbuf *src,
gboolean horizontal)
{
GdkPixbuf *dest;
guchar *p, *q;
gint x, y;
dest = gdk_pixbuf_new (src->colorspace,
src->has_alpha,
src->bits_per_sample,
src->width,
src->height);
if (!dest)
return NULL;
if (!horizontal) /* flip vertical */
{
for (y = 0; y < dest->height; y++)
{
p = src->pixels + OFFSET (src, 0, y);
q = dest->pixels + OFFSET (dest, 0, dest->height - y - 1);
memcpy (q, p, dest->rowstride);
}
}
else /* flip horizontal */
{
for (y = 0; y < dest->height; y++)
{
for (x = 0; x < dest->width; x++)
{
p = src->pixels + OFFSET (src, x, y);
q = dest->pixels + OFFSET (dest, dest->width - x - 1, y);
memcpy (q, p, dest->n_channels);
}
}
}
return dest;
}

13
gdk-pixbuf/gdk-pixbuf-transform.h
View File

@ -42,6 +42,13 @@ typedef enum {
GDK_INTERP_HYPER
} GdkInterpType;
typedef enum {
GDK_PIXBUF_ROTATE_NONE = 0,
GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE = 90,
GDK_PIXBUF_ROTATE_UPSIDEDOWN = 180,
GDK_PIXBUF_ROTATE_CLOCKWISE = 270
} GdkPixbufRotation;
void gdk_pixbuf_scale (const GdkPixbuf *src,
GdkPixbuf *dest,
int dest_x,
@ -97,7 +104,11 @@ GdkPixbuf *gdk_pixbuf_composite_color_simple (const GdkPixbuf *src,
guint32 color1,
guint32 color2);
GdkPixbuf *gdk_pixbuf_rotate_simple (const GdkPixbuf *src,
GdkPixbufRotation angle);
GdkPixbuf *gdk_pixbuf_flip (const GdkPixbuf *src,
gboolean horizontal);
G_END_DECLS