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colorscale: Draw hue background as a texture

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No need to use Cairo here.
This commit is contained in:
Benjamin Otte 2018-03-26 00:12:20 +02:00
parent b16ac01a03
commit 438b4b6b5c
1 changed files with 37 additions and 33 deletions
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70
gtk/gtkcolorscale.c
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@ -62,63 +62,67 @@ gtk_color_scale_snapshot_trough (GtkColorScale *scale,
int height)
{
GtkWidget *widget = GTK_WIDGET (scale);
cairo_t *cr;
if (width <= 1 || height <= 1)
return;
cr = gtk_snapshot_append_cairo (snapshot,
&GRAPHENE_RECT_INIT(x, y, width, height),
"ColorScaleTrough");
cairo_translate (cr, x, y);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
{
cairo_translate (cr, width, 0);
cairo_scale (cr, -1, 1);
}
if (scale->priv->type == GTK_COLOR_SCALE_HUE)
{
GdkTexture *texture;
gint stride;
cairo_surface_t *tmp;
guint red, green, blue;
guint32 *data, *p;
GBytes *bytes;
guchar *data, *p;
gdouble h;
gdouble r, g, b;
gdouble f;
int hue_x, hue_y;
tmp = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
width, height);
stride = cairo_image_surface_get_stride (tmp);
data = (guint32* )cairo_image_surface_get_data (tmp);
stride = width * 3;
data = g_malloc (width * height * 3);
f = 1.0 / (height - 1);
for (hue_y = 0; hue_y < height; hue_y++)
{
h = CLAMP (hue_y * f, 0.0, 1.0);
p = data + hue_y * (stride / 4);
for (hue_x = 0; hue_x < width; hue_x++)
p = data + hue_y * stride;
for (hue_x = 0; hue_x < stride; hue_x += 3)
{
gtk_hsv_to_rgb (h, 1, 1, &r, &g, &b);
red = CLAMP (r * 255, 0, 255);
green = CLAMP (g * 255, 0, 255);
blue = CLAMP (b * 255, 0, 255);
p[hue_x] = 0xFF000000 | (red << 16) | (green << 8) | blue;
p[hue_x + 0] = CLAMP (r * 255, 0, 255);
p[hue_x + 1] = CLAMP (g * 255, 0, 255);
p[hue_x + 2] = CLAMP (b * 255, 0, 255);
}
}
cairo_surface_mark_dirty (tmp);
bytes = g_bytes_new_take (data, width * height * 3);
texture = gdk_memory_texture_new (width, height,
GDK_MEMORY_R8G8B8,
bytes,
stride);
g_bytes_unref (bytes);
cairo_set_source_surface (cr, tmp, 0, 0);
cairo_paint (cr);
cairo_surface_destroy (tmp);
gtk_snapshot_append_texture (snapshot,
texture,
&GRAPHENE_RECT_INIT(x, y, width, height),
"ColorScaleHue");
g_object_unref (texture);
}
else if (scale->priv->type == GTK_COLOR_SCALE_ALPHA)
{
cairo_t *cr;
cr = gtk_snapshot_append_cairo (snapshot,
&GRAPHENE_RECT_INIT(x, y, width, height),
"ColorScaleAlpha");
cairo_translate (cr, x, y);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
{
cairo_translate (cr, width, 0);
cairo_scale (cr, -1, 1);
}
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
GdkRGBA *color;
@ -141,9 +145,9 @@ gtk_color_scale_snapshot_trough (GtkColorScale *scale,
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
}
cairo_destroy (cr);
cairo_destroy (cr);
}
}
static void