Add API for extracting image size from a file

For the asynchronous loading we need a function call that parses
a file, given its path, and retrieves the image width and height.

This commit adds cogl_bitmap_get_size_from_file() to the CoglBitmap
API.
This commit is contained in:
Emmanuele Bassi 2009-01-12 16:52:20 +00:00
parent 743b5c03dc
commit c78d963e90
4 changed files with 86 additions and 9 deletions

View File

@ -415,10 +415,27 @@ void cogl_texture_polygon (CoglHandle handle,
*
* Returns: A #CoglBitmap to the new loaded image data, or %NULL if loading
* the image failed.
*
* Since: 1.0
*/
CoglBitmap * cogl_bitmap_new_from_file (const gchar *filename,
GError **error);
/**
* cogl_bitmap_get_size_from_file:
* @filename: the file to check
* @width: return location for the bitmap width
* @height: return location for the bitmap height
*
* Parses an image file enough to extract the width and height
* of the bitmap.
*
* Since: 1.0
*/
gboolean cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height);
/**
* cogl_bitmap_free:
* @bmp: a #CoglBitmap.

View File

@ -84,6 +84,20 @@ cogl_bitmap_error_quark (void)
return g_quark_from_static_string ("cogl-bitmap-error-quark");
}
gboolean
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
if (width)
*width = 0;
if (height)
*height = 0;
return TRUE;
}
/* the error does not contain the filename as the caller already has it */
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
@ -177,9 +191,22 @@ _cogl_bitmap_from_file (CoglBitmap *bmp,
#elif defined(USE_GDKPIXBUF)
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
const gchar *filename,
GError **error)
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
g_return_val_if_fail (filename != NULL, FALSE);
if (gdk_pixbuf_get_file_info (filename, width, height) != NULL)
return TRUE;
return FALSE;
}
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
const gchar *filename,
GError **error)
{
GdkPixbuf *pixbuf;
gboolean has_alpha;
@ -198,11 +225,13 @@ _cogl_bitmap_from_file (CoglBitmap *bmp,
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (bmp == NULL) return FALSE;
if (bmp == NULL)
return FALSE;
/* Load from file using GdkPixbuf */
pixbuf = gdk_pixbuf_new_from_file (filename, error);
if (pixbuf == NULL) return FALSE;
if (pixbuf == NULL)
return FALSE;
/* Get pixbuf properties */
has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
@ -278,6 +307,20 @@ _cogl_bitmap_from_file (CoglBitmap *bmp,
#include "stb_image.c"
gboolean
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
if (width)
*width = 0;
if (height)
*height = 0;
return TRUE;
}
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
const gchar *filename,
@ -290,11 +333,15 @@ _cogl_bitmap_from_file (CoglBitmap *bmp,
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (bmp == NULL) return FALSE;
if (bmp == NULL)
return FALSE;
/* Load from file using stb */
pixels = stbi_load (filename, &width, &height, &stb_pixel_format, STBI_rgb_alpha);
if (pixels == NULL) return FALSE;
pixels = stbi_load (filename,
&width, &height, &stb_pixel_format,
STBI_rgb_alpha);
if (pixels == NULL)
return FALSE;
/* Store bitmap info */
bmp->data = g_memdup (pixels, height * width * 4);

View File

@ -149,6 +149,14 @@ _cogl_bitmap_copy_subregion (CoglBitmap *src,
}
}
gboolean
cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
return _cogl_bitmap_get_size_from_file (filename, width, height);
}
CoglBitmap *
cogl_bitmap_new_from_file (const gchar *filename,
GError **error)

View File

@ -90,4 +90,9 @@ _cogl_bitmap_copy_subregion (CoglBitmap *src,
gint width,
gint height);
gboolean
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height);
#endif /* __COGL_BITMAP_H */