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[CoglPangoDisplayList] Don't store the base color in the display list

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It should be possible render a single PangoLayout with different
colors without recalculating the layout. This was not working because
the color used at the first edit was being stored in the display
list. This broke changing the opacity on a ClutterText.

Now each node in the display list has a 'color override' flag which
marks whether it should use the base color or not. The base color is
now passed in from _cogl_pango_display_list_render_texture. The alpha
value is always taken from the base color.
This commit is contained in:
Neil Roberts
2009-06-05 18:00:22 +01:00
parent 6fe22ac850
commit ea15e4c7f0
3 changed files with 53 additions and 23 deletions
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44
clutter/pango/cogl-pango-display-list.c
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@ -43,6 +43,7 @@ typedef struct _CoglPangoDisplayListVertex CoglPangoDisplayListVertex;
struct _CoglPangoDisplayList
{
gboolean color_override;
CoglColor color;
GSList *nodes;
GSList *last_node;
@ -52,6 +53,7 @@ struct _CoglPangoDisplayListNode
{
CoglPangoDisplayListNodeType type;
gboolean color_override;
CoglColor color;
union
@ -106,12 +108,19 @@ _cogl_pango_display_list_append_node (CoglPangoDisplayList *dl,
}
void
_cogl_pango_display_list_set_color (CoglPangoDisplayList *dl,
const CoglColor *color)
_cogl_pango_display_list_set_color_override (CoglPangoDisplayList *dl,
const CoglColor *color)
{
dl->color_override = TRUE;
dl->color = *color;
}
void
_cogl_pango_display_list_remove_color_override (CoglPangoDisplayList *dl)
{
dl->color_override = FALSE;
}
void
_cogl_pango_display_list_add_texture (CoglPangoDisplayList *dl,
CoglHandle texture,
@ -128,7 +137,10 @@ _cogl_pango_display_list_add_texture (CoglPangoDisplayList *dl,
if (dl->last_node
&& (node = dl->last_node->data)->type == COGL_PANGO_DISPLAY_LIST_TEXTURE
&& node->d.texture.texture == texture
&& !memcmp (&dl->color, &node->color, sizeof (CoglColor)))
&& (dl->color_override
? (node->color_override && !memcmp (&dl->color, &node->color,
sizeof (CoglColor)))
: !node->color_override))
{
/* Get rid of the vertex buffer so that it will be recreated */
if (node->d.texture.vertex_buffer != COGL_INVALID_HANDLE)
@ -143,6 +155,7 @@ _cogl_pango_display_list_add_texture (CoglPangoDisplayList *dl,
node = g_slice_new (CoglPangoDisplayListNode);
node->type = COGL_PANGO_DISPLAY_LIST_TEXTURE;
node->color_override = dl->color_override;
node->color = dl->color;
node->d.texture.texture = cogl_texture_ref (texture);
node->d.texture.verts
@ -187,6 +200,7 @@ _cogl_pango_display_list_add_rectangle (CoglPangoDisplayList *dl,
CoglPangoDisplayListNode *node = g_slice_new (CoglPangoDisplayListNode);
node->type = COGL_PANGO_DISPLAY_LIST_RECTANGLE;
node->color_override = dl->color_override;
node->color = dl->color;
node->d.rectangle.x_1 = x_1;
node->d.rectangle.y_1 = y_1;
@ -208,6 +222,7 @@ _cogl_pango_display_list_add_trapezoid (CoglPangoDisplayList *dl,
CoglPangoDisplayListNode *node = g_slice_new (CoglPangoDisplayListNode);
node->type = COGL_PANGO_DISPLAY_LIST_TRAPEZOID;
node->color_override = dl->color_override;
node->color = dl->color;
node->d.trapezoid.y_1 = y_1;
node->d.trapezoid.x_11 = x_11;
@ -221,10 +236,11 @@ _cogl_pango_display_list_add_trapezoid (CoglPangoDisplayList *dl,
static void
_cogl_pango_display_list_render_texture (CoglHandle material,
const CoglColor *color,
CoglPangoDisplayListNode *node)
{
cogl_material_set_layer (material, 0, node->d.texture.texture);
cogl_material_set_color (material, &node->color);
cogl_material_set_color (material, color);
cogl_set_source (material);
if (node->d.texture.vertex_buffer == COGL_INVALID_HANDLE)
@ -274,6 +290,7 @@ _cogl_pango_display_list_render_texture (CoglHandle material,
void
_cogl_pango_display_list_render (CoglPangoDisplayList *dl,
const CoglColor *color,
CoglHandle glyph_material,
CoglHandle solid_material)
{
@ -282,15 +299,28 @@ _cogl_pango_display_list_render (CoglPangoDisplayList *dl,
for (l = dl->nodes; l; l = l->next)
{
CoglPangoDisplayListNode *node = l->data;
CoglColor draw_color;
if (node->color_override)
/* Use the override color but preserve the alpha from the
draw color */
cogl_color_set_from_4ub (&draw_color,
cogl_color_get_red_byte (&node->color),
cogl_color_get_green_byte (&node->color),
cogl_color_get_blue_byte (&node->color),
cogl_color_get_alpha_byte (color));
else
draw_color = *color;
switch (node->type)
{
case COGL_PANGO_DISPLAY_LIST_TEXTURE:
_cogl_pango_display_list_render_texture (glyph_material, node);
_cogl_pango_display_list_render_texture (glyph_material,
&draw_color, node);
break;
case COGL_PANGO_DISPLAY_LIST_RECTANGLE:
cogl_material_set_color (solid_material, &node->color);
cogl_material_set_color (solid_material, &draw_color);
cogl_set_source (solid_material);
cogl_rectangle (node->d.rectangle.x_1,
node->d.rectangle.y_1,
@ -311,7 +341,7 @@ _cogl_pango_display_list_render (CoglPangoDisplayList *dl,
points[6] = node->d.trapezoid.x_21;
points[7] = node->d.trapezoid.y_1;
cogl_material_set_color (solid_material, &node->color);
cogl_material_set_color (solid_material, &draw_color);
cogl_set_source (solid_material);
cogl_path_polygon (points, 4);
cogl_path_fill ();