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colorbutton: Render with Cairo

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In particular, this gets rid of gdk_draw_pixbuf() and GdkGC usage.
This commit is contained in:
Benjamin Otte 2010-07-12 01:10:08 +02:00
parent d203b830a9
commit de6314d084
1 changed files with 71 additions and 197 deletions
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268
gtk/gtkcolorbutton.c
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@ -47,15 +47,12 @@
/* Size of checks and gray levels for alpha compositing checkerboard */
#define CHECK_SIZE 4
#define CHECK_DARK 21845 /* 65535 / 3 */
#define CHECK_LIGHT 43690
#define CHECK_DARK (1.0 / 3.0)
#define CHECK_LIGHT (2.0 / 3.0)
struct _GtkColorButtonPrivate
{
GdkPixbuf *pixbuf; /* Pixbuf for rendering sample */
GdkGC *gc; /* GC for drawing */
GtkWidget *draw_area; /* Widget where we draw the color sample */
GtkWidget *cs_dialog; /* Color selection dialog */
@ -96,12 +93,8 @@ static void gtk_color_button_get_property (GObject *object,
GParamSpec *pspec);
/* gtkwidget signals */
static void gtk_color_button_realize (GtkWidget *widget);
static void gtk_color_button_unrealize (GtkWidget *widget);
static void gtk_color_button_state_changed (GtkWidget *widget,
GtkStateType previous_state);
static void gtk_color_button_style_set (GtkWidget *widget,
GtkStyle *previous_style);
/* gtkbutton signals */
static void gtk_color_button_clicked (GtkButton *button);
@ -149,9 +142,6 @@ gtk_color_button_class_init (GtkColorButtonClass *klass)
gobject_class->set_property = gtk_color_button_set_property;
gobject_class->finalize = gtk_color_button_finalize;
widget_class->state_changed = gtk_color_button_state_changed;
widget_class->realize = gtk_color_button_realize;
widget_class->unrealize = gtk_color_button_unrealize;
widget_class->style_set = gtk_color_button_style_set;
button_class->clicked = gtk_color_button_clicked;
klass->color_set = NULL;
@ -241,102 +231,34 @@ gtk_color_button_class_init (GtkColorButtonClass *klass)
g_type_class_add_private (gobject_class, sizeof (GtkColorButtonPrivate));
}
static void
render (GtkColorButton *color_button)
static gboolean
gtk_color_button_has_alpha (GtkColorButton *color_button)
{
gint dark_r, dark_g, dark_b;
gint light_r, light_g, light_b;
gint i, j, rowstride;
gint width, height;
gint c1[3], c2[3];
guchar *pixels;
guint8 insensitive_r = 0;
guint8 insensitive_g = 0;
guint8 insensitive_b = 0;
return color_button->priv->use_alpha &&
color_button->priv->alpha < 65535;
}
width = color_button->priv->draw_area->allocation.width;
height = color_button->priv->draw_area->allocation.height;
if (color_button->priv->pixbuf == NULL ||
gdk_pixbuf_get_width (color_button->priv->pixbuf) != width ||
gdk_pixbuf_get_height (color_button->priv->pixbuf) != height)
static cairo_pattern_t *
gtk_color_button_get_checkered (void)
{
/* need to respect pixman's stride being a multiple of 4 */
static unsigned char data[8] = { 0xFF, 0x00, 0x00, 0x00,
0x00, 0xFF, 0x00, 0x00 };
static cairo_surface_t *checkered = NULL;
cairo_pattern_t *pattern;
if (checkered == NULL)
{
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
}
/* Compute dark and light check colors */
insensitive_r = GTK_WIDGET(color_button)->style->bg[GTK_STATE_INSENSITIVE].red >> 8;
insensitive_g = GTK_WIDGET(color_button)->style->bg[GTK_STATE_INSENSITIVE].green >> 8;
insensitive_b = GTK_WIDGET(color_button)->style->bg[GTK_STATE_INSENSITIVE].blue >> 8;
if (color_button->priv->use_alpha)
{
dark_r = ((CHECK_DARK << 16) + (color_button->priv->color.red - CHECK_DARK) * color_button->priv->alpha) >> 24;
dark_g = ((CHECK_DARK << 16) + (color_button->priv->color.green - CHECK_DARK) * color_button->priv->alpha) >> 24;
dark_b = ((CHECK_DARK << 16) + (color_button->priv->color.blue - CHECK_DARK) * color_button->priv->alpha) >> 24;
light_r = ((CHECK_LIGHT << 16) + (color_button->priv->color.red - CHECK_LIGHT) * color_button->priv->alpha) >> 24;
light_g = ((CHECK_LIGHT << 16) + (color_button->priv->color.green - CHECK_LIGHT) * color_button->priv->alpha) >> 24;
light_b = ((CHECK_LIGHT << 16) + (color_button->priv->color.blue - CHECK_LIGHT) * color_button->priv->alpha) >> 24;
}
else
{
dark_r = light_r = color_button->priv->color.red >> 8;
dark_g = light_g = color_button->priv->color.green >> 8;
dark_b = light_b = color_button->priv->color.blue >> 8;
checkered = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_A8,
2, 2, 4);
}
/* Fill image buffer */
pixels = gdk_pixbuf_get_pixels (color_button->priv->pixbuf);
rowstride = gdk_pixbuf_get_rowstride (color_button->priv->pixbuf);
for (j = 0; j < height; j++)
{
if ((j / CHECK_SIZE) & 1)
{
c1[0] = dark_r;
c1[1] = dark_g;
c1[2] = dark_b;
c2[0] = light_r;
c2[1] = light_g;
c2[2] = light_b;
}
else
{
c1[0] = light_r;
c1[1] = light_g;
c1[2] = light_b;
c2[0] = dark_r;
c2[1] = dark_g;
c2[2] = dark_b;
}
for (i = 0; i < width; i++)
{
if (!gtk_widget_is_sensitive (GTK_WIDGET (color_button)) && (i+j)%2)
{
*(pixels + j * rowstride + i * 3) = insensitive_r;
*(pixels + j * rowstride + i * 3 + 1) = insensitive_g;
*(pixels + j * rowstride + i * 3 + 2) = insensitive_b;
}
else if ((i / CHECK_SIZE) & 1)
{
*(pixels + j * rowstride + i * 3) = c1[0];
*(pixels + j * rowstride + i * 3 + 1) = c1[1];
*(pixels + j * rowstride + i * 3 + 2) = c1[2];
}
else
{
*(pixels + j * rowstride + i * 3) = c2[0];
*(pixels + j * rowstride + i * 3 + 1) = c2[1];
*(pixels + j * rowstride + i * 3 + 2) = c2[2];
}
}
}
pattern = cairo_pattern_create_for_surface (checkered);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
return pattern;
}
/* Handle exposure events for the color picker's drawing area */
@ -346,81 +268,61 @@ expose_event (GtkWidget *widget,
gpointer data)
{
GtkColorButton *color_button = GTK_COLOR_BUTTON (data);
GtkAllocation allocation;
cairo_pattern_t *checkered;
cairo_t *cr;
gint width = color_button->priv->draw_area->allocation.width;
gint height = color_button->priv->draw_area->allocation.height;
cr = gdk_cairo_create (event->window);
if (color_button->priv->pixbuf == NULL ||
width != gdk_pixbuf_get_width (color_button->priv->pixbuf) ||
height != gdk_pixbuf_get_height (color_button->priv->pixbuf))
render (color_button);
gtk_widget_get_allocation (widget, &allocation);
gdk_cairo_rectangle (cr, &allocation);
cairo_clip (cr);
if (gtk_color_button_has_alpha (color_button))
{
cairo_save (cr);
cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK);
cairo_paint (cr);
cairo_set_source_rgb (cr, CHECK_LIGHT, CHECK_LIGHT, CHECK_LIGHT);
cairo_scale (cr, CHECK_SIZE, CHECK_SIZE);
checkered = gtk_color_button_get_checkered ();
cairo_mask (cr, checkered);
cairo_pattern_destroy (checkered);
cairo_restore (cr);
cairo_set_source_rgba (cr,
color_button->priv->color.red / 65535.,
color_button->priv->color.green / 65535.,
color_button->priv->color.blue / 65535.,
color_button->priv->alpha / 65535.);
}
else
{
gdk_cairo_set_source_color (cr, &color_button->priv->color);
}
cairo_paint (cr);
if (!gtk_widget_is_sensitive (GTK_WIDGET (color_button)))
{
gdk_cairo_set_source_color (cr, &GTK_WIDGET(color_button)->style->bg[GTK_STATE_INSENSITIVE]);
checkered = gtk_color_button_get_checkered ();
cairo_mask (cr, checkered);
cairo_pattern_destroy (checkered);
}
gdk_draw_pixbuf (widget->window,
color_button->priv->gc,
color_button->priv->pixbuf,
event->area.x - widget->allocation.x,
event->area.y - widget->allocation.y,
event->area.x,
event->area.y,
event->area.width,
event->area.height,
GDK_RGB_DITHER_MAX,
event->area.x - widget->allocation.x,
event->area.y - widget->allocation.y);
return FALSE;
}
static void
gtk_color_button_realize (GtkWidget *widget)
{
GtkColorButton *color_button = GTK_COLOR_BUTTON (widget);
GTK_WIDGET_CLASS (gtk_color_button_parent_class)->realize (widget);
color_button->priv->gc = gdk_gc_new (widget->window);
render (color_button);
}
static void
gtk_color_button_unrealize (GtkWidget *widget)
{
GtkColorButton *color_button = GTK_COLOR_BUTTON (widget);
g_object_unref (color_button->priv->gc);
color_button->priv->gc = NULL;
GTK_WIDGET_CLASS (gtk_color_button_parent_class)->unrealize (widget);
}
static void
gtk_color_button_style_set (GtkWidget *widget,
GtkStyle *previous_style)
{
GtkColorButton *color_button = GTK_COLOR_BUTTON (widget);
GTK_WIDGET_CLASS (gtk_color_button_parent_class)->style_set (widget, previous_style);
if (gtk_widget_get_realized (widget))
{
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
}
}
static void
gtk_color_button_state_changed (GtkWidget *widget,
GtkStateType previous_state)
GtkStateType previous_state)
{
GtkColorButton *color_button = GTK_COLOR_BUTTON (widget);
if (widget->state == GTK_STATE_INSENSITIVE || previous_state == GTK_STATE_INSENSITIVE)
{
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
}
gtk_widget_queue_draw (widget);
}
static void
@ -455,10 +357,6 @@ gtk_color_button_drag_data_received (GtkWidget *widget,
color_button->priv->color.blue = dropped[2];
color_button->priv->alpha = dropped[3];
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
gtk_widget_queue_draw (color_button->priv->draw_area);
g_signal_emit (color_button, color_button_signals[COLOR_SET], 0);
@ -558,13 +456,6 @@ gtk_color_button_init (GtkColorButton *color_button)
color_button->priv->title = g_strdup (_("Pick a Color")); /* default title */
/* Create the buffer for the image so that we can create an image.
* Also create the picker's pixmap.
*/
color_button->priv->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, rect.width, rect.height);
color_button->priv->gc = NULL;
/* Start with opaque black, alpha disabled */
color_button->priv->color.red = 0;
@ -601,10 +492,6 @@ gtk_color_button_finalize (GObject *object)
gtk_widget_destroy (color_button->priv->cs_dialog);
color_button->priv->cs_dialog = NULL;
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
g_free (color_button->priv->title);
color_button->priv->title = NULL;
@ -661,10 +548,6 @@ dialog_ok_clicked (GtkWidget *widget,
gtk_color_selection_get_current_color (color_selection, &color_button->priv->color);
color_button->priv->alpha = gtk_color_selection_get_current_alpha (color_selection);
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
gtk_widget_hide (color_button->priv->cs_dialog);
gtk_widget_queue_draw (color_button->priv->draw_area);
@ -778,10 +661,6 @@ gtk_color_button_set_color (GtkColorButton *color_button,
color_button->priv->color.green = color->green;
color_button->priv->color.blue = color->blue;
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
gtk_widget_queue_draw (color_button->priv->draw_area);
g_object_notify (G_OBJECT (color_button), "color");
@ -805,10 +684,6 @@ gtk_color_button_set_alpha (GtkColorButton *color_button,
color_button->priv->alpha = alpha;
if (color_button->priv->pixbuf != NULL)
g_object_unref (color_button->priv->pixbuf);
color_button->priv->pixbuf = NULL;
gtk_widget_queue_draw (color_button->priv->draw_area);
g_object_notify (G_OBJECT (color_button), "alpha");
@ -873,7 +748,6 @@ gtk_color_button_set_use_alpha (GtkColorButton *color_button,
{
color_button->priv->use_alpha = use_alpha;
render (color_button);
gtk_widget_queue_draw (color_button->priv->draw_area);
g_object_notify (G_OBJECT (color_button), "use-alpha");