static void cdisplay_gamma_convert_buffer (GimpColorDisplay *display, GeglBuffer *buffer, GeglRectangle *area) { CdisplayGamma *gamma = CDISPLAY_GAMMA (display); GeglBufferIterator *iter; gdouble one_over_gamma; one_over_gamma = 1.0 / gamma->gamma; iter = gegl_buffer_iterator_new (buffer, area, 0, babl_format ("R'G'B'A float"), GEGL_ACCESS_READWRITE, GEGL_ABYSS_NONE); while (gegl_buffer_iterator_next (iter)) { gfloat *data = iter->data[0]; gint count = iter->length; while (count--) { *data = pow (*data, one_over_gamma); data++; *data = pow (*data, one_over_gamma); data++; *data = pow (*data, one_over_gamma); data++; data++; } } }
static void cdisplay_gamma_convert_surface (GimpColorDisplay *display, cairo_surface_t *surface) { CdisplayGamma *gamma = CDISPLAY_GAMMA (display); gint width = cairo_image_surface_get_width (surface); gint height = cairo_image_surface_get_height (surface); gint stride = cairo_image_surface_get_stride (surface); guchar *buf = cairo_image_surface_get_data (surface); cairo_format_t fmt = cairo_image_surface_get_format (surface); gint i, j, skip; gint r, g, b, a; if (fmt != CAIRO_FORMAT_ARGB32) return; /* You will not be using the entire buffer most of the time. * Hence, the simplistic code for this is as follows: * * for (j = 0; j < height; j++) * { * for (i = 0; i < width * bpp; i++) * buf[i] = lookup[buf[i]]; * buf += bpl; * } */ j = height; skip = stride - 4 * width; while (j--) { i = width; while (i--) { GIMP_CAIRO_ARGB32_GET_PIXEL (buf, r, g, b, a); r = gamma->lookup[r]; g = gamma->lookup[g]; b = gamma->lookup[b]; GIMP_CAIRO_ARGB32_SET_PIXEL (buf, r, g, b, a); buf += 4; } buf += skip; } }
static void cdisplay_gamma_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) { CdisplayGamma *gamma = CDISPLAY_GAMMA (object); switch (property_id) { case PROP_GAMMA: cdisplay_gamma_set_gamma (gamma, g_value_get_double (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } }
static GtkWidget * cdisplay_gamma_configure (GimpColorDisplay *display) { CdisplayGamma *gamma = CDISPLAY_GAMMA (display); GtkWidget *hbox; GtkWidget *label; GtkWidget *spinbutton; hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6); label = gtk_label_new_with_mnemonic (_("_Gamma:")); gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0); gtk_widget_show (label); spinbutton = gimp_prop_spin_button_new (G_OBJECT (gamma), "gamma", 0.1, 1.0, 3); gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0); gtk_widget_show (spinbutton); gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton); return hbox; }
static void cdisplay_gamma_convert (GimpColorDisplay *display, guchar *buf, gint width, gint height, gint bpp, gint bpl) { CdisplayGamma *gamma = CDISPLAY_GAMMA (display); gint i, j = height; /* You will not be using the entire buffer most of the time. * Hence, the simplistic code for this is as follows: * * for (j = 0; j < height; j++) * { * for (i = 0; i < width * bpp; i++) * buf[i] = lookup[buf[i]]; * buf += bpl; * } */ width *= bpp; bpl -= width; while (j--) { i = width; while (i--) { *buf = gamma->lookup[*buf]; buf++; } buf += bpl; } }