Hi.
I missed list the first time (sorry Roei for spamming you).
---------- Forwarded message ----------From: Tadej Borovšak <tadeboro@xxxxxxxxx>Date: 2009/2/22Subject: Re: cairo_surface_t to pixbufTo: Roei Azachi <roei@xxxxxxxxxxxxxxxx>
2009/2/22 Roei Azachi <roei@xxxxxxxxxxxxxxxx>:> Hi,> I was wondering if there is a way of converting cairo_surface_t to pixbuf> currently I am doing:> cairo_surface_write_to_png(oimg2, "tmp.png");> pixbuf = gdk_pixbuf_new_from_file("tmp.png", &g_err);> I'm sure there is a way, but I don't know how...> Thanks,> Roei> _______________________________________________> gtk-list mailing list> gtk-list@xxxxxxxxx> http://mail.gnome.org/mailman/listinfo/gtk-list>
Hi.
I only converted cairo's image surfaces to PPM images. I did this byobtaining surface's width, height, rowstride and format, then manuallycopied pixel values from surface to PPM.
Simple function for converting surface to pixbuf would look something like this:
------- CODE --------GdkPixbuf *convert( cairo_surface_t *surface ){ GdkPixbuf *pixbuf; gint width = cairo_image_surface_get_width( surface ); gint height = cairo_image_surface_get_height( surface ); gint stride = cairo_image_surface_get_stride( surface ); cairo_format_t format = cairo_image_surface_get_format( surface ); guchar *data = cairo_image_surface_get_data( surface ); gint row, col;
if( format == CAIRO_FORMAT_ARGB32 ) { guchar *pixels; gint pix_stride;
/* Temporary pointers for iterating. */ guchar *p_dat, *p_pix;
pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE, 8,width, height ); pixels = gdk_pixbuf_get_pixels( pixbuf ); pix_stride = gdk_pixbuf_get_rowstride( pixbuf );
p_dat = data; p_pix = pixels;
for( row = 0; row < height; row++ ) { p_pix = pixels + row * pix_stride; p_dat = data + row * stride;
for( col = 0; col < width; col++ ) { /* Copy now. Cairo image surfaces usepre-multiplied * alpha, this is why we need tocalculate RGB values. */ p_pix[0] = p_dat[1] / p_dat[0] * 0xff; p_pix[1] = p_dat[2] / p_dat[0] * 0xff; p_pix[2] = p_dat[3] / p_dat[0] * 0xff; p_pix[3] = p_dat[0];
p_pix += 4; p_dat += 4; } } } else if( format == CAIRO_FORMAT_RGB24 ) { guchar *pixels; gint pix_stride;
/* Temporary pointers for iterating. */ guchar *p_dat, *p_pix;
pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, FALSE, 8,width, height ); pixels = gdk_pixbuf_get_pixels( pixbuf ); pix_stride = gdk_pixbuf_get_rowstride( pixbuf );
p_dat = data; p_pix = pixels;
for( row = 0; row < height; row++ ) { p_pix = pixels + row * pix_stride; p_dat = data + row * stride;
for( col = 0; col < width; col++ ) { p_pix[0] = p_dat[0]; p_pix[1] = p_dat[1]; p_pix[2] = p_dat[2];
p_pix += 3; p_dat += 4; } } }
return( pixbuf );}-------- CODE ---------
Note though that I haven't tested this function, so test it beforeusing in real application.
--Tadej Borovšaktadeboro@xxxxxxxxxxxxxxxxxxxxxxx@gmail.com
-- Tadej Borovšaktadeboro@xxxxxxxxxxxxxxxxxxxxxxx@gmail.com_______________________________________________gtk-list mailing listgtk-list@xxxxxxxxxxxxx://mail.gnome.org/mailman/listinfo/gtk-list
