diff options
Diffstat (limited to 'tikzit/src/gtk/gtkhelpers.m')
| -rw-r--r-- | tikzit/src/gtk/gtkhelpers.m | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tikzit/src/gtk/gtkhelpers.m b/tikzit/src/gtk/gtkhelpers.m index 3e4ab8a..cc21622 100644 --- a/tikzit/src/gtk/gtkhelpers.m +++ b/tikzit/src/gtk/gtkhelpers.m @@ -239,4 +239,39 @@ tz_hijack_key_press (GtkWindow *win, return FALSE; } +GdkPixbuf * pixbuf_get_from_surface(cairo_surface_t *surface) { + cairo_surface_flush (surface); + + int width = cairo_image_surface_get_width (surface); + int height = cairo_image_surface_get_height (surface); + int stride = cairo_image_surface_get_stride (surface); + unsigned char *data = cairo_image_surface_get_data (surface); + + GdkPixbuf *pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, + TRUE, + 8, + width, + height); + unsigned char *pbdata = gdk_pixbuf_get_pixels (pixbuf); + int pbstride = gdk_pixbuf_get_rowstride (pixbuf); + + for (int y = 0; y < height; ++y) { + uint32_t *line = (uint32_t*)(data + y*stride); + unsigned char *pbline = pbdata + (y*pbstride); + for (int x = 0; x < width; ++x) { + uint32_t pixel = *(line + x); + unsigned char *pbpixel = pbline + (x*4); + // NB: We should un-pre-mult the alpha here. + // However, in our world, alpha is always + // on or off, so it doesn't really matter + pbpixel[3] = ((pixel & 0xff000000) >> 24); + pbpixel[0] = ((pixel & 0x00ff0000) >> 16); + pbpixel[1] = ((pixel & 0x0000ff00) >> 8); + pbpixel[2] = (pixel & 0x000000ff); + } + } + + return pixbuf; +} + // vim:ft=objc:ts=8:et:sts=4:sw=4 |