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st-theme-node-drawing.c
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st-theme-node-drawing.c
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-theme-node-drawing.c: Code to draw themed elements
*
* Copyright 2009, 2010 Red Hat, Inc.
* Copyright 2009, 2010 Florian Müllner
* Copyright 2010 Intel Corporation.
*
* Contains code derived from:
* rectangle.c: Rounded rectangle.
* Copyright 2008 litl, LLC.
* st-texture-frame.h: Expandible texture actor
* Copyright 2007 OpenedHand
* Copyright 2009 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <math.h>
#include "st-shadow.h"
#include "st-private.h"
#include "st-theme-private.h"
#include "st-theme-context.h"
#include "st-texture-cache.h"
#include "st-theme-node-private.h"
/****
* Rounded corners
****/
typedef struct {
ClutterColor color;
ClutterColor border_color_1;
ClutterColor border_color_2;
guint radius;
guint border_width_1;
guint border_width_2;
} StCornerSpec;
static void
elliptical_arc (cairo_t *cr,
double x_center,
double y_center,
double x_radius,
double y_radius,
double angle1,
double angle2)
{
cairo_save (cr);
cairo_translate (cr, x_center, y_center);
cairo_scale (cr, x_radius, y_radius);
cairo_arc (cr, 0, 0, 1.0, angle1, angle2);
cairo_restore (cr);
}
static CoglHandle
create_corner_material (StCornerSpec *corner)
{
CoglHandle texture;
cairo_t *cr;
cairo_surface_t *surface;
guint rowstride;
guint8 *data;
guint size;
guint max_border_width;
max_border_width = MAX(corner->border_width_2, corner->border_width_1);
size = 2 * MAX(max_border_width, corner->radius);
rowstride = size * 4;
data = g_new0 (guint8, size * rowstride);
surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
size, size,
rowstride);
cr = cairo_create (surface);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_scale (cr, size, size);
if (max_border_width <= corner->radius)
{
double x_radius, y_radius;
if (max_border_width != 0)
{
cairo_set_source_rgba (cr,
corner->border_color_1.red / 255.,
corner->border_color_1.green / 255.,
corner->border_color_1.blue / 255.,
corner->border_color_1.alpha / 255.);
cairo_arc (cr, 0.5, 0.5, 0.5, 0, 2 * M_PI);
cairo_fill (cr);
}
cairo_set_source_rgba (cr,
corner->color.red / 255.,
corner->color.green / 255.,
corner->color.blue / 255.,
corner->color.alpha / 255.);
x_radius = 0.5 * (1.0 - (double) corner->border_width_2 / corner->radius);
y_radius = 0.5 * (1.0 - (double) corner->border_width_1 / corner->radius);
/* TOPRIGHT */
elliptical_arc (cr,
0.5, 0.5,
x_radius, y_radius,
3 * M_PI / 2, 2 * M_PI);
/* BOTTOMRIGHT */
elliptical_arc (cr,
0.5, 0.5,
x_radius, y_radius,
0, M_PI / 2);
/* TOPLEFT */
elliptical_arc (cr,
0.5, 0.5,
x_radius, y_radius,
M_PI, 3 * M_PI / 2);
/* BOTTOMLEFT */
elliptical_arc (cr,
0.5, 0.5,
x_radius, y_radius,
M_PI / 2, M_PI);
cairo_fill (cr);
}
else
{
double radius;
radius = (gdouble)corner->radius / max_border_width;
cairo_set_source_rgba (cr,
corner->border_color_1.red / 255.,
corner->border_color_1.green / 255.,
corner->border_color_1.blue / 255.,
corner->border_color_1.alpha / 255.);
cairo_arc (cr, radius, radius, radius, M_PI, 3 * M_PI / 2);
cairo_line_to (cr, 1.0 - radius, 0.0);
cairo_arc (cr, 1.0 - radius, radius, radius, 3 * M_PI / 2, 2 * M_PI);
cairo_line_to (cr, 1.0, 1.0 - radius);
cairo_arc (cr, 1.0 - radius, 1.0 - radius, radius, 0, M_PI / 2);
cairo_line_to (cr, radius, 1.0);
cairo_arc (cr, radius, 1.0 - radius, radius, M_PI / 2, M_PI);
cairo_fill (cr);
}
cairo_destroy (cr);
cairo_surface_destroy (surface);
texture = cogl_texture_new_from_data (size, size,
COGL_TEXTURE_NONE,
CLUTTER_CAIRO_FORMAT_ARGB32,
COGL_PIXEL_FORMAT_ANY,
rowstride,
data);
g_free (data);
return texture;
}
static char *
corner_to_string (StCornerSpec *corner)
{
return g_strdup_printf ("st-theme-node-corner:%02x%02x%02x%02x,%02x%02x%02x%02x,%02x%02x%02x%02x,%u,%u,%u",
corner->color.red, corner->color.blue, corner->color.green, corner->color.alpha,
corner->border_color_1.red, corner->border_color_1.green, corner->border_color_1.blue, corner->border_color_1.alpha,
corner->border_color_2.red, corner->border_color_2.green, corner->border_color_2.blue, corner->border_color_2.alpha,
corner->radius,
corner->border_width_1,
corner->border_width_2);
}
static CoglHandle
load_corner (StTextureCache *cache,
const char *key,
void *datap,
GError **error)
{
return create_corner_material ((StCornerSpec *) datap);
}
/* To match the CSS specification, we want the border to look like it was
* drawn over the background. But actually drawing the border over the
* background will produce slightly bad antialiasing at the edges, so
* compute the effective border color instead.
*/
#define NORM(x) (t = (x) + 127, (t + (t >> 8)) >> 8)
#define MULT(c,a) NORM(c*a)
static void
premultiply (ClutterColor *color)
{
guint t;
color->red = MULT (color->red, color->alpha);
color->green = MULT (color->green, color->alpha);
color->blue = MULT (color->blue, color->alpha);
}
static void
unpremultiply (ClutterColor *color)
{
guint alpha = color->alpha;
guint round = alpha / 2;
if (alpha)
{
color->red = (color->red * 255 + round) / alpha;
color->green = (color->green * 255 + round) / alpha;
color->blue = (color->blue * 255 + round) / alpha;
}
}
static void
over (const ClutterColor *source,
const ClutterColor *destination,
ClutterColor *result)
{
guint t;
ClutterColor src = *source;
ClutterColor dst = *destination;
premultiply (&src);
premultiply (&dst);
result->alpha = src.alpha + NORM ((255 - src.alpha) * dst.alpha);
result->red = src.red + NORM ((255 - src.alpha) * dst.red);
result->green = src.green + NORM ((255 - src.alpha) * dst.green);
result->blue = src.blue + NORM ((255 - src.alpha) * dst.blue);
unpremultiply (result);
}
/*
* st_theme_node_reduce_border_radius:
* @node: a #StThemeNode
* @corners: (array length=4) (out): reduced corners
*
* Implements the corner overlap algorithm mentioned at
* http://www.w3.org/TR/css3-background/#corner-overlap
*/
static void
st_theme_node_reduce_border_radius (StThemeNode *node,
guint *corners)
{
gfloat scale;
guint sum;
scale = 1.0;
/* top */
sum = node->border_radius[ST_CORNER_TOPLEFT]
+ node->border_radius[ST_CORNER_TOPRIGHT];
if (sum > 0)
scale = MIN (node->alloc_width / sum, scale);
/* right */
sum = node->border_radius[ST_CORNER_TOPRIGHT]
+ node->border_radius[ST_CORNER_BOTTOMRIGHT];
if (sum > 0)
scale = MIN (node->alloc_height / sum, scale);
/* bottom */
sum = node->border_radius[ST_CORNER_BOTTOMLEFT]
+ node->border_radius[ST_CORNER_BOTTOMRIGHT];
if (sum > 0)
scale = MIN (node->alloc_width / sum, scale);
/* left */
sum = node->border_radius[ST_CORNER_BOTTOMLEFT]
+ node->border_radius[ST_CORNER_TOPLEFT];
if (sum > 0)
scale = MIN (node->alloc_height / sum, scale);
corners[ST_CORNER_TOPLEFT] = node->border_radius[ST_CORNER_TOPLEFT] * scale;
corners[ST_CORNER_TOPRIGHT] = node->border_radius[ST_CORNER_TOPRIGHT] * scale;
corners[ST_CORNER_BOTTOMLEFT] = node->border_radius[ST_CORNER_BOTTOMLEFT] * scale;
corners[ST_CORNER_BOTTOMRIGHT] = node->border_radius[ST_CORNER_BOTTOMRIGHT] * scale;
}
static void
st_theme_node_get_corner_border_widths (StThemeNode *node,
StCorner corner_id,
guint *border_width_1,
guint *border_width_2)
{
switch (corner_id)
{
case ST_CORNER_TOPLEFT:
if (border_width_1)
*border_width_1 = node->border_width[ST_SIDE_TOP];
if (border_width_2)
*border_width_2 = node->border_width[ST_SIDE_LEFT];
break;
case ST_CORNER_TOPRIGHT:
if (border_width_1)
*border_width_1 = node->border_width[ST_SIDE_TOP];
if (border_width_2)
*border_width_2 = node->border_width[ST_SIDE_RIGHT];
break;
case ST_CORNER_BOTTOMRIGHT:
if (border_width_1)
*border_width_1 = node->border_width[ST_SIDE_BOTTOM];
if (border_width_2)
*border_width_2 = node->border_width[ST_SIDE_RIGHT];
break;
case ST_CORNER_BOTTOMLEFT:
if (border_width_1)
*border_width_1 = node->border_width[ST_SIDE_BOTTOM];
if (border_width_2)
*border_width_2 = node->border_width[ST_SIDE_LEFT];
break;
default:
g_warning("st_theme_node_get_corner_border_widths: default case");
break;
}
}
static CoglHandle
st_theme_node_lookup_corner (StThemeNode *node,
StCorner corner_id)
{
CoglHandle texture, material= NULL;
char *key;
StTextureCache *cache;
StCornerSpec corner;
guint radius[4];
st_theme_node_reduce_border_radius (node, radius);
if (radius[corner_id] == 0)
return NULL;
cache = st_texture_cache_get_default ();
corner.radius = radius[corner_id];
corner.color = node->background_color;
st_theme_node_get_corner_border_widths (node, corner_id,
&corner.border_width_1,
&corner.border_width_2);
switch (corner_id)
{
case ST_CORNER_TOPLEFT:
over (&node->border_color[ST_SIDE_TOP], &corner.color, &corner.border_color_1);
over (&node->border_color[ST_SIDE_LEFT], &corner.color, &corner.border_color_2);
break;
case ST_CORNER_TOPRIGHT:
over (&node->border_color[ST_SIDE_TOP], &corner.color, &corner.border_color_1);
over (&node->border_color[ST_SIDE_RIGHT], &corner.color, &corner.border_color_2);
break;
case ST_CORNER_BOTTOMRIGHT:
over (&node->border_color[ST_SIDE_BOTTOM], &corner.color, &corner.border_color_1);
over (&node->border_color[ST_SIDE_RIGHT], &corner.color, &corner.border_color_2);
break;
case ST_CORNER_BOTTOMLEFT:
over (&node->border_color[ST_SIDE_BOTTOM], &corner.color, &corner.border_color_1);
over (&node->border_color[ST_SIDE_LEFT], &corner.color, &corner.border_color_2);
break;
default:
g_warning("st_theme_node_lookup_corner: default case");
break;
}
if (corner.color.alpha == 0 &&
corner.border_color_1.alpha == 0 &&
corner.border_color_2.alpha == 0)
return NULL;
key = corner_to_string (&corner);
texture = st_texture_cache_load (cache, key, ST_TEXTURE_CACHE_POLICY_NONE, load_corner, &corner, NULL);
if (texture)
{
material = _st_create_texture_pipeline (texture);
cogl_object_unref (texture);
}
g_free (key);
return material;
}
static void
get_background_scale (StThemeNode *node,
gdouble painting_area_width,
gdouble painting_area_height,
gdouble background_image_width,
gdouble background_image_height,
gdouble *scale_w,
gdouble *scale_h)
{
*scale_w = -1.0;
*scale_h = -1.0;
switch (node->background_size)
{
case ST_BACKGROUND_SIZE_AUTO:
*scale_w = 1.0;
break;
case ST_BACKGROUND_SIZE_CONTAIN:
*scale_w = MIN (painting_area_width / background_image_width,
painting_area_height / background_image_height);
break;
case ST_BACKGROUND_SIZE_COVER:
*scale_w = MAX (painting_area_width / background_image_width,
painting_area_height / background_image_height);
break;
case ST_BACKGROUND_SIZE_FIXED:
if (node->background_size_w > -1)
{
*scale_w = node->background_size_w / background_image_width;
if (node->background_size_h > -1)
*scale_h = node->background_size_h / background_image_height;
}
else if (node->background_size_h > -1)
*scale_w = node->background_size_h / background_image_height;
break;
default:
g_warning("get_background_scale: default case");
break;
}
if (*scale_h < 0.0)
*scale_h = *scale_w;
}
static void
get_background_coordinates (StThemeNode *node,
gdouble painting_area_width,
gdouble painting_area_height,
gdouble background_image_width,
gdouble background_image_height,
gdouble *x,
gdouble *y)
{
/* honor the specified position if any */
if (node->background_position_set)
{
*x = node->background_position_x;
*y = node->background_position_y;
}
else
{
/* center the background on the widget */
*x = (painting_area_width / 2.0) - (background_image_width / 2.0);
*y = (painting_area_height / 2.0) - (background_image_height / 2.0);
}
}
static void
get_background_position (StThemeNode *self,
const ClutterActorBox *allocation,
ClutterActorBox *result,
ClutterActorBox *texture_coords)
{
gdouble painting_area_width, painting_area_height;
gdouble background_image_width, background_image_height;
gdouble x1, y1;
gdouble scale_w, scale_h;
/* get the background image size */
background_image_width = cogl_texture_get_width (self->background_texture);
background_image_height = cogl_texture_get_height (self->background_texture);
/* get the painting area size */
painting_area_width = allocation->x2 - allocation->x1;
painting_area_height = allocation->y2 - allocation->y1;
/* scale if requested */
get_background_scale (self,
painting_area_width, painting_area_height,
background_image_width, background_image_height,
&scale_w, &scale_h);
background_image_width *= scale_w;
background_image_height *= scale_h;
/* get coordinates */
get_background_coordinates (self,
painting_area_width, painting_area_height,
background_image_width, background_image_height,
&x1, &y1);
if (self->background_repeat)
{
gdouble width = allocation->x2 - allocation->x1 + x1;
gdouble height = allocation->y2 - allocation->y1 + y1;
*result = *allocation;
/* reference image is at x1, y1 */
texture_coords->x1 = x1 / background_image_width;
texture_coords->y1 = y1 / background_image_height;
texture_coords->x2 = width / background_image_width;
texture_coords->y2 = height / background_image_height;
}
else
{
result->x1 = x1;
result->y1 = y1;
result->x2 = x1 + background_image_width;
result->y2 = y1 + background_image_height;
texture_coords->x1 = texture_coords->y1 = 0;
texture_coords->x2 = texture_coords->y2 = 1;
}
}
/* Use of this function marks code which doesn't support
* non-uniform colors.
*/
static void
get_arbitrary_border_color (StThemeNode *node,
ClutterColor *color)
{
if (color)
st_theme_node_get_border_color (node, ST_SIDE_TOP, color);
}
static gboolean
st_theme_node_has_visible_outline (StThemeNode *node)
{
if (node->background_color.alpha > 0)
return TRUE;
if (node->background_gradient_end.alpha > 0)
return TRUE;
if (node->border_radius[ST_CORNER_TOPLEFT] > 0 ||
node->border_radius[ST_CORNER_TOPRIGHT] > 0 ||
node->border_radius[ST_CORNER_BOTTOMLEFT] > 0 ||
node->border_radius[ST_CORNER_BOTTOMRIGHT] > 0)
return TRUE;
if (node->border_width[ST_SIDE_TOP] > 0 ||
node->border_width[ST_SIDE_LEFT] > 0 ||
node->border_width[ST_SIDE_RIGHT] > 0 ||
node->border_width[ST_SIDE_BOTTOM] > 0)
return TRUE;
return FALSE;
}
static cairo_pattern_t *
create_cairo_pattern_of_background_gradient (StThemeNode *node)
{
cairo_pattern_t *pattern;
g_return_val_if_fail (node->background_gradient_type != ST_GRADIENT_NONE,
NULL);
if (node->background_gradient_type == ST_GRADIENT_VERTICAL)
pattern = cairo_pattern_create_linear (0, 0, 0, node->alloc_height);
else if (node->background_gradient_type == ST_GRADIENT_HORIZONTAL)
pattern = cairo_pattern_create_linear (0, 0, node->alloc_width, 0);
else
{
gdouble cx, cy;
cx = node->alloc_width / 2.;
cy = node->alloc_height / 2.;
pattern = cairo_pattern_create_radial (cx, cy, 0, cx, cy, MIN (cx, cy));
}
cairo_pattern_add_color_stop_rgba (pattern, 0,
node->background_color.red / 255.,
node->background_color.green / 255.,
node->background_color.blue / 255.,
node->background_color.alpha / 255.);
cairo_pattern_add_color_stop_rgba (pattern, 1,
node->background_gradient_end.red / 255.,
node->background_gradient_end.green / 255.,
node->background_gradient_end.blue / 255.,
node->background_gradient_end.alpha / 255.);
return pattern;
}
static cairo_pattern_t *
create_cairo_pattern_of_background_image (StThemeNode *node,
gboolean *needs_background_fill)
{
cairo_surface_t *surface;
cairo_pattern_t *pattern;
cairo_content_t content;
cairo_matrix_t matrix;
const char *file;
StTextureCache *texture_cache;
gdouble background_image_width, background_image_height;
gdouble x, y;
gdouble scale_w, scale_h;
file = st_theme_node_get_background_image (node);
texture_cache = st_texture_cache_get_default ();
surface = st_texture_cache_load_file_to_cairo_surface (texture_cache, file);
if (surface == NULL)
return NULL;
g_assert (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE);
content = cairo_surface_get_content (surface);
pattern = cairo_pattern_create_for_surface (surface);
background_image_width = cairo_image_surface_get_width (surface);
background_image_height = cairo_image_surface_get_height (surface);
*needs_background_fill = TRUE;
cairo_matrix_init_identity (&matrix);
get_background_scale (node,
node->alloc_width, node->alloc_height,
background_image_width, background_image_height,
&scale_w, &scale_h);
if ((scale_w != 1) || (scale_h != 1))
cairo_matrix_scale (&matrix, 1.0/scale_w, 1.0/scale_h);
background_image_width *= scale_w;
background_image_height *= scale_h;
get_background_coordinates (node,
node->alloc_width, node->alloc_height,
background_image_width, background_image_height,
&x, &y);
cairo_matrix_translate (&matrix, -x, -y);
if (node->background_repeat)
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
/* If it's opaque, fills up the entire allocated
* area, then don't bother doing a background fill first
*/
if (content != CAIRO_CONTENT_COLOR_ALPHA)
{
if (node->background_repeat ||
(x >= 0 &&
y >= 0 &&
background_image_width - x >= node->alloc_width &&
background_image_height -y >= node->alloc_height))
*needs_background_fill = FALSE;
}
cairo_pattern_set_matrix (pattern, &matrix);
return pattern;
}
/* fill_exterior = TRUE means that pattern is a surface pattern and
* we should extend the pattern with a solid fill from its edges.
* This is a bit of a hack; the alternative would be to make the
* surface of the surface pattern 1 pixel bigger and use CAIRO_EXTEND_PAD.
*/
static void
paint_shadow_pattern_to_cairo_context (StShadow *shadow_spec,
cairo_pattern_t *pattern,
gboolean fill_exterior,
cairo_t *cr,
cairo_path_t *interior_path,
cairo_path_t *outline_path)
{
/* If there are borders, clip the shadow to the interior
* of the borders; if there is a visible outline, clip the shadow to
* that outline
*/
cairo_path_t *path = (interior_path != NULL) ? interior_path : outline_path;
double x1, x2, y1, y2;
/* fill_exterior only makes sense if we're clipping the shadow - filling
* to the edges of the surface would be silly */
g_assert (!(fill_exterior && path == NULL));
cairo_save (cr);
if (path != NULL)
{
cairo_append_path (cr, path);
/* There's no way to invert a path in cairo, so we need bounds for
* the area we are drawing in order to create the "exterior" region.
* Pixel align to hit fast paths.
*/
if (fill_exterior)
{
cairo_path_extents (cr, &x1, &y1, &x2, &y2);
x1 = floor (x1);
y1 = floor (y1);
x2 = ceil (x2);
y2 = ceil (y2);
}
cairo_clip (cr);
}
cairo_set_source_rgba (cr,
shadow_spec->color.red / 255.0,
shadow_spec->color.green / 255.0,
shadow_spec->color.blue / 255.0,
shadow_spec->color.alpha / 255.0);
if (fill_exterior)
{
cairo_surface_t *surface;
int width, height;
cairo_matrix_t matrix;
cairo_save (cr);
/* Start with a rectangle enclosing the bounds of the clipped
* region */
cairo_rectangle (cr, x1, y1, x2 - x1, y2 - y1);
/* Then subtract out the bounds of the surface in the surface
* pattern; we transform the context by the inverse of the
* pattern matrix to get to surface coordinates */
if (cairo_pattern_get_surface (pattern, &surface) != CAIRO_STATUS_SUCCESS)
/* Something went wrong previously */
goto no_surface;
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
cairo_pattern_get_matrix (pattern, &matrix);
cairo_matrix_invert (&matrix);
cairo_transform (cr, &matrix);
cairo_rectangle (cr, 0, height, width, - height);
cairo_fill (cr);
cairo_restore (cr);
}
cairo_mask (cr, pattern);
no_surface:
cairo_restore (cr);
}
static void
paint_background_image_shadow_to_cairo_context (StThemeNode *node,
StShadow *shadow_spec,
cairo_pattern_t *pattern,
cairo_t *cr,
cairo_path_t *interior_path,
cairo_path_t *outline_path,
int x,
int y,
int width,
int height)
{
cairo_pattern_t *shadow_pattern;
g_assert (shadow_spec != NULL);
g_assert (pattern != NULL);
if (outline_path != NULL)
{
cairo_surface_t *clipped_surface;
cairo_pattern_t *clipped_pattern;
cairo_t *temp_cr;
/* Prerender the pattern to a temporary surface,
* so it's properly clipped before we create a shadow from it
*/
clipped_surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
temp_cr = cairo_create (clipped_surface);
cairo_set_operator (temp_cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (temp_cr);
cairo_set_operator (temp_cr, CAIRO_OPERATOR_SOURCE);
if (interior_path != NULL)
{
cairo_append_path (temp_cr, interior_path);
cairo_clip (temp_cr);
}
cairo_append_path (temp_cr, outline_path);
cairo_translate (temp_cr, x, y);
cairo_set_source (temp_cr, pattern);
cairo_clip (temp_cr);
cairo_paint (temp_cr);
cairo_destroy (temp_cr);
clipped_pattern = cairo_pattern_create_for_surface (clipped_surface);
cairo_surface_destroy (clipped_surface);
shadow_pattern = _st_create_shadow_cairo_pattern (shadow_spec,
clipped_pattern);
cairo_pattern_destroy (clipped_pattern);
}
else
{
shadow_pattern = _st_create_shadow_cairo_pattern (shadow_spec,
pattern);
}
paint_shadow_pattern_to_cairo_context (shadow_spec,
shadow_pattern, FALSE,
cr,
interior_path,
outline_path);
cairo_pattern_destroy (shadow_pattern);
}
/* gets the extents of a cairo_path_t; slightly inefficient, but much simpler than
* computing from the raw path data */
static void
path_extents (cairo_path_t *path,
double *x1,
double *y1,
double *x2,
double *y2)
{
cairo_surface_t *dummy = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
cairo_t *cr = cairo_create (dummy);
cairo_append_path (cr, path);
cairo_path_extents (cr, x1, y1, x2, y2);
cairo_destroy (cr);
cairo_surface_destroy (dummy);
}
static void
paint_inset_box_shadow_to_cairo_context (StThemeNode *node,
StShadow *shadow_spec,
cairo_t *cr,
cairo_path_t *shadow_outline)
{
cairo_surface_t *shadow_surface;
cairo_pattern_t *shadow_pattern;
double extents_x1, extents_y1, extents_x2, extents_y2;
double shrunk_extents_x1, shrunk_extents_y1, shrunk_extents_x2, shrunk_extents_y2;
gboolean fill_exterior;
g_assert (shadow_spec != NULL);
g_assert (shadow_outline != NULL);
/* Create the pattern used to create the inset shadow; as the shadow
* should be drawn as if everything outside the outline was opaque,
* we use a temporary surface to draw the background as a solid shape,
* which is inverted when creating the shadow pattern.
*/
/* First we need to find the size of the temporary surface
*/
path_extents (shadow_outline,
&extents_x1, &extents_y1, &extents_x2, &extents_y2);
/* Shrink the extents by the spread, and offset */
shrunk_extents_x1 = extents_x1 + shadow_spec->xoffset + shadow_spec->spread;
shrunk_extents_y1 = extents_y1 + shadow_spec->yoffset + shadow_spec->spread;
shrunk_extents_x2 = extents_x2 + shadow_spec->xoffset - shadow_spec->spread;
shrunk_extents_y2 = extents_y2 + shadow_spec->yoffset - shadow_spec->spread;
if (shrunk_extents_x1 >= shrunk_extents_x2 || shrunk_extents_y1 >= shrunk_extents_x2)
{
/* Shadow occupies entire area within border */
shadow_pattern = cairo_pattern_create_rgb (0., 0., 0.);
fill_exterior = FALSE;
}
else
{
/* Bounds of temporary surface */
int surface_x = floor (shrunk_extents_x1);
int surface_y = floor (shrunk_extents_y1);
int surface_width = ceil (shrunk_extents_x2) - surface_x;
int surface_height = ceil (shrunk_extents_y2) - surface_y;
/* Center of the original path */
double x_center = (extents_x1 + extents_x2) / 2;
double y_center = (extents_y1 + extents_y2) / 2;
cairo_pattern_t *pattern;
cairo_t *temp_cr;
cairo_matrix_t matrix;
shadow_surface = cairo_image_surface_create (CAIRO_FORMAT_A8, surface_width, surface_height);
temp_cr = cairo_create (shadow_surface);
/* Match the coordinates in the temporary context to the parent context */
cairo_translate (temp_cr, - surface_x, - surface_y);
/* Shadow offset */
cairo_translate (temp_cr, shadow_spec->xoffset, shadow_spec->yoffset);
/* Scale the path around the center to match the shrunk bounds */
cairo_translate (temp_cr, x_center, y_center);
cairo_scale (temp_cr,
(shrunk_extents_x2 - shrunk_extents_x1) / (extents_x2 - extents_x1),
(shrunk_extents_y2 - shrunk_extents_y1) / (extents_y2 - extents_y1));
cairo_translate (temp_cr, - x_center, - y_center);
cairo_append_path (temp_cr, shadow_outline);
cairo_fill (temp_cr);
cairo_destroy (temp_cr);
pattern = cairo_pattern_create_for_surface (shadow_surface);
cairo_surface_destroy (shadow_surface);
/* The pattern needs to be offset back to coordinates in the parent context */
cairo_matrix_init_translate (&matrix, - surface_x, - surface_y);
cairo_pattern_set_matrix (pattern, &matrix);
shadow_pattern = _st_create_shadow_cairo_pattern (shadow_spec, pattern);
fill_exterior = TRUE;
cairo_pattern_destroy (pattern);
}
paint_shadow_pattern_to_cairo_context (shadow_spec,
shadow_pattern, fill_exterior,
cr,
shadow_outline,
NULL);
cairo_pattern_destroy (shadow_pattern);
}
/* In order for borders to be smoothly blended with non-solid backgrounds,
* we need to use cairo. This function is a slow fallback path for those
* cases (gradients, background images, etc).
*/
static CoglHandle
st_theme_node_prerender_background (StThemeNode *node)
{
StBorderImage *border_image;
CoglHandle texture;
guint radius[4];
int i;
cairo_t *cr;
cairo_surface_t *surface;
StShadow *shadow_spec;
StShadow *box_shadow_spec;
cairo_pattern_t *pattern = NULL;
cairo_path_t *outline_path = NULL;
gboolean draw_solid_background = TRUE;
gboolean background_is_translucent;
gboolean interior_dirty;
gboolean draw_background_image_shadow = FALSE;
gboolean has_visible_outline;
ClutterColor border_color;
guint border_width[4];
guint rowstride;
guchar *data;
ClutterActorBox actor_box;
ClutterActorBox paint_box;
cairo_path_t *interior_path = NULL;
border_image = st_theme_node_get_border_image (node);
shadow_spec = st_theme_node_get_background_image_shadow (node);
box_shadow_spec = st_theme_node_get_box_shadow (node);
actor_box.x1 = 0;
actor_box.x2 = node->alloc_width;
actor_box.y1 = 0;
actor_box.y2 = node->alloc_height;
/* If there's a background image shadow, we
* may need to create an image bigger than the nodes
* allocation
*/
st_theme_node_get_background_paint_box (node, &actor_box, &paint_box);
/* translate the boxes so the paint box is at 0,0
*/
actor_box.x1 += - paint_box.x1;
actor_box.x2 += - paint_box.x1;
actor_box.y1 += - paint_box.y1;
actor_box.y2 += - paint_box.y1;
paint_box.x2 += - paint_box.x1;
paint_box.x1 += - paint_box.x1;
paint_box.y2 += - paint_box.y1;
paint_box.y1 += - paint_box.y1;
rowstride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32,
paint_box.x2 - paint_box.x1);
data = g_new0 (guchar, (paint_box.y2 - paint_box.y1) * rowstride);