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Add a public cogl_bitmap_new_for_data

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This creates a CoglBitmap which points into an existing buffer in
system memory. That way it can be used to create a texture or to read
pixel data into. The function replaces the existing internal function
_cogl_bitmap_new_from_data but removes the destroy notify call back.
If the application wants notification of destruction it can just use
the cogl_object_set_user_data function as normal. Internally there is
now a convenience function to create a bitmap for system memory and
automatically free the buffer using that mechanism.

The name of the function is inspired by
cairo_image_surface_create_for_data which has similar semantics.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts
2012-03-13 14:46:18 +00:00
parent f65a895b4f
commit d18b59d9e6
14 changed files with 273 additions and 261 deletions
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32
cogl/cogl-bitmap-pixbuf.c
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@ -28,6 +28,7 @@
#include "cogl-util.h"
#include "cogl-internal.h"
#include "cogl-bitmap-private.h"
#include "cogl-context-private.h"
#include <string.h>
@ -166,17 +167,11 @@ _cogl_bitmap_get_size_from_file (const char *filename,
return FALSE;
}
static void
_cogl_bitmap_unref_pixbuf (guint8 *pixels,
void *pixbuf)
{
g_object_unref (pixbuf);
}
CoglBitmap *
_cogl_bitmap_from_file (const char *filename,
GError **error)
{
static CoglUserDataKey pixbuf_key;
GdkPixbuf *pixbuf;
gboolean has_alpha;
GdkColorspace color_space;
@ -186,6 +181,9 @@ _cogl_bitmap_from_file (const char *filename,
int rowstride;
int bits_per_sample;
int n_channels;
CoglBitmap *bmp;
_COGL_GET_CONTEXT (ctx, NULL);
_COGL_RETURN_VAL_IF_FAIL (error == NULL || *error == NULL, FALSE);
@ -233,13 +231,19 @@ _cogl_bitmap_from_file (const char *filename,
to read past the end of bpp*width on the last row even if the
rowstride is much larger so we don't need to worry about
GdkPixbuf's semantics that it may under-allocate the buffer. */
return _cogl_bitmap_new_from_data (gdk_pixbuf_get_pixels (pixbuf),
pixel_format,
width,
height,
rowstride,
_cogl_bitmap_unref_pixbuf,
pixbuf);
bmp = cogl_bitmap_new_for_data (ctx,
width,
height,
pixel_format,
rowstride,
gdk_pixbuf_get_pixels (pixbuf));
cogl_object_set_user_data (COGL_OBJECT (bmp),
&pixbuf_key,
pixbuf,
g_object_unref);
return bmp;
}
#else