Re: embedding bitmap images into code

[Guillaume Brocker <guillaume brocker digital-trainers com>]

Le 06/10/2010 09:44, Igor Gorbounov a écrit :
> 06.10.2010 11:29, Guillaume Brocker пишет:
> > Hello !
> >
> > XPM images [1] may be a solution. In this format, an image is stored
> > as a char array defined in a C header file. You will just need to
> > include that file to get the image embedded in your code.
> >
> > The problem is that cairo does not provide a way to handle XPM data.
> > You can use Gdk::Pixbuf [2] to load XPM data and then
> > Gdk::Cairo::set_source_pixbuf [3].
> Thanks for your answer!
> It looks like I've solved this problem at last:
>
> I've taken a C-structure with data, made by Gimp (save as C-code), it
> looks like this:
>
> /* GIMP RGBA C-Source image dump (stock_form-time-field.c) */
>
> static const struct {
> guint width;
> guint height;
> guint bytes_per_pixel; /* 3:RGB, 4:RGBA */
> guint8 pixel_data[24 * 24 * 4 + 1];
> } gimp_image = {
> 24, 24, 4,
> "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\23\0\0\0o"
> ...
> This was made from a PNG picture (24x24 pixels). Then I've placed
> this image in my drawingarea this way:
>
> int stride =
> Cairo::ImageSurface::format_stride_for_width(Cairo::FORMAT_ARGB32,
> gimp_image.width);
> Cairo::RefPtr<Cairo::ImageSurface> test_image =
> Cairo::ImageSurface::create((uint8_t *)&gimp_image.pixel_data,
> Cairo::FORMAT_ARGB32, gimp_image.width, gimp_image.height, stride);
> context->set_source(test_image, 50, 50);
> context->paint();

This is very interesting. I didn't know the GIMP C-code format.

Guillaume