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correct version of: port cairo ARGB/BGRA -> pixbuf RGBA patch from recent 2.X commit (restores text on canvas), in which i move some functions around, rename stuff and add comments

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git-svn-id: svn://localhost/ardour2/branches/3.0@7846 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2010-09-26 13:33:39 +00:00
parent 0d2ddbe52a
commit aad157337c
8 changed files with 161 additions and 140 deletions
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145
libs/gtkmm2ext/utils.cc
View file

@ -34,6 +34,13 @@
using namespace std;
void
Gtkmm2ext::init ()
{
// Necessary for gettext
(void) bindtextdomain(PACKAGE, LOCALEDIR);
}
void
Gtkmm2ext::get_ink_pixel_size (Glib::RefPtr<Pango::Layout> layout,
int& width,
@ -84,11 +91,112 @@ Gtkmm2ext::set_size_request_to_display_given_text (Gtk::Widget &w,
w.set_size_request(width_max + hpadding, height_max + vpadding);
}
void
Gtkmm2ext::init ()
static inline guint8
demultiply_alpha (guint8 src,
guint8 alpha)
{
// Necessary for gettext
(void) bindtextdomain(PACKAGE, LOCALEDIR);
/* cairo pixel buffer data contains RGB values with the alpha
values premultiplied.
GdkPixbuf pixel buffer data contains RGB values without the
alpha value applied.
this removes the alpha component from the cairo version and
returns the GdkPixbuf version.
*/
return alpha ? ((guint (src) << 8) - src) / alpha : 0;
}
static void
convert_bgra_to_rgba (guint8 const* src,
guint8* dst,
int width,
int height)
{
guint8 const* src_pixel = src;
guint8* dst_pixel = dst;
/* cairo pixel data is endian-dependent ARGB with A in the most significant 8 bits,
with premultipled alpha values (see preceding function)
GdkPixbuf pixel data is non-endian-dependent RGBA with R in the lowest addressable
8 bits, and non-premultiplied alpha values.
convert from the cairo values to the GdkPixbuf ones.
*/
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
/* Cairo [ B G R A ] is actually [ B G R A ] in memory SOURCE
0 1 2 3
Pixbuf [ R G B A ] is actually [ R G B A ] in memory DEST
*/
dst_pixel[0] = demultiply_alpha (src_pixel[2],
src_pixel[3]); // R [0] <= [ 2 ]
dst_pixel[1] = demultiply_alpha (src_pixel[1],
src_pixel[3]); // G [1] <= [ 1 ]
dst_pixel[2] = demultiply_alpha (src_pixel[0],
src_pixel[3]); // B [2] <= [ 0 ]
dst_pixel[3] = src_pixel[3]; // alpha
#elif G_BYTE_ORDER == G_BIG_ENDIAN
/* Cairo [ B G R A ] is actually [ A R G B ] in memory SOURCE
0 1 2 3
Pixbuf [ R G B A ] is actually [ R G B A ] in memory DEST
*/
dst_pixel[0] = demultiply_alpha (src_pixel[1],
src_pixel[0]); // R [0] <= [ 1 ]
dst_pixel[1] = demultiply_alpha (src_pixel[2],
src_pixel[0]); // G [1] <= [ 2 ]
dst_pixel[2] = demultiply_alpha (src_pixel[3],
src_pixel[0]); // B [2] <= [ 3 ]
dst_pixel[3] = src_pixel[0]; // alpha
#else
#error ardour does not currently support PDP-endianess
#endif
dst_pixel += 4;
src_pixel += 4;
}
}
}
Glib::RefPtr<Gdk::Pixbuf>
Gtkmm2ext::pixbuf_from_string(const string& name, Pango::FontDescription* font, int clip_width, int clip_height, Gdk::Color fg)
{
static Glib::RefPtr<Gdk::Pixbuf>* empty_pixbuf = 0;
if (name.empty()) {
if (empty_pixbuf == 0) {
empty_pixbuf = new Glib::RefPtr<Gdk::Pixbuf>;
*empty_pixbuf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, true, 8, clip_width, clip_height);
}
return *empty_pixbuf;
}
Glib::RefPtr<Gdk::Pixbuf> buf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, true, 8, clip_width, clip_height);
cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, clip_width, clip_height);
cairo_t* cr = cairo_create (surface);
cairo_text_extents_t te;
cairo_set_source_rgba (cr, fg.get_red_p(), fg.get_green_p(), fg.get_blue_p(), 1.0);
cairo_select_font_face (cr, font->get_family().c_str(),
CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, font->get_size() / Pango::SCALE);
cairo_text_extents (cr, name.c_str(), &te);
cairo_move_to (cr, 0.5, 0.5 - te.height / 2 - te.y_bearing + clip_height / 2);
cairo_show_text (cr, name.c_str());
convert_bgra_to_rgba(cairo_image_surface_get_data (surface), buf->get_pixels(), clip_width, clip_height);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return buf;
}
void
@ -239,3 +347,32 @@ Gtkmm2ext::possibly_translate_legal_accelerator_to_real_key (uint32_t keyval)
return keyval;
}
int
Gtkmm2ext::physical_screen_height (Glib::RefPtr<Gdk::Window> win)
{
GdkScreen* scr = gdk_screen_get_default();
if (win) {
GdkRectangle r;
gint monitor = gdk_screen_get_monitor_at_window (scr, win->gobj());
gdk_screen_get_monitor_geometry (scr, monitor, &r);
return r.height;
} else {
return gdk_screen_get_height (scr);
}
}
int
Gtkmm2ext::physical_screen_width (Glib::RefPtr<Gdk::Window> win)
{
GdkScreen* scr = gdk_screen_get_default();
if (win) {
GdkRectangle r;
gint monitor = gdk_screen_get_monitor_at_window (scr, win->gobj());
gdk_screen_get_monitor_geometry (scr, monitor, &r);
return r.width;
} else {
return gdk_screen_get_width (scr);
}
}