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livetrax/libs/clearlooks-newer/cairo-support.c

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#include <math.h>
#include "general-support.h"
#include "cairo-support.h"
/***********************************************
* ge_hsb_from_color -
*
* Get HSB values from RGB values.
*
* Modified from Smooth but originated in GTK+
***********************************************/
void
ge_hsb_from_color (const CairoColor *color,
gdouble *hue,
gdouble *saturation,
gdouble *brightness)
{
gdouble min, max, delta;
gdouble red, green, blue;
red = color->r;
green = color->g;
blue = color->b;
if (red > green)
{
max = MAX(red, blue);
min = MIN(green, blue);
}
else
{
max = MAX(green, blue);
min = MIN(red, blue);
}
*brightness = (max + min) / 2;
if (fabs(max - min) < 0.0001)
{
*hue = 0;
*saturation = 0;
}
else
{
if (*brightness <= 0.5)
*saturation = (max - min) / (max + min);
else
*saturation = (max - min) / (2 - max - min);
delta = max -min;
if (red == max)
*hue = (green - blue) / delta;
else if (green == max)
*hue = 2 + (blue - red) / delta;
else if (blue == max)
*hue = 4 + (red - green) / delta;
*hue *= 60;
if (*hue < 0.0)
*hue += 360;
}
}
/***********************************************
* ge_color_from_hsb -
*
* Get RGB values from HSB values.
*
* Modified from Smooth but originated in GTK+
***********************************************/
#define MODULA(number, divisor) (((gint)number % divisor) + (number - (gint)number))
void
ge_color_from_hsb (gdouble hue,
gdouble saturation,
gdouble brightness,
CairoColor *color)
{
gint i;
gdouble hue_shift[3], color_shift[3];
gdouble m1, m2, m3;
if (!color) return;
if (brightness <= 0.5)
m2 = brightness * (1 + saturation);
else
m2 = brightness + saturation - brightness * saturation;
m1 = 2 * brightness - m2;
hue_shift[0] = hue + 120;
hue_shift[1] = hue;
hue_shift[2] = hue - 120;
color_shift[0] = color_shift[1] = color_shift[2] = brightness;
i = (saturation == 0)?3:0;
for (; i < 3; i++)
{
m3 = hue_shift[i];
if (m3 > 360)
m3 = MODULA(m3, 360);
else if (m3 < 0)
m3 = 360 - MODULA(ABS(m3), 360);
if (m3 < 60)
color_shift[i] = m1 + (m2 - m1) * m3 / 60;
else if (m3 < 180)
color_shift[i] = m2;
else if (m3 < 240)
color_shift[i] = m1 + (m2 - m1) * (240 - m3) / 60;
else
color_shift[i] = m1;
}
color->r = color_shift[0];
color->g = color_shift[1];
color->b = color_shift[2];
color->a = 1.0;
}
void
ge_gdk_color_to_cairo (const GdkColor *c, CairoColor *cc)
{
gdouble r, g, b;
g_return_if_fail (c && cc);
r = c->red / 65535.0;
g = c->green / 65535.0;
b = c->blue / 65535.0;
cc->r = r;
cc->g = g;
cc->b = b;
cc->a = 1.0;
}
void
ge_cairo_color_to_gtk (const CairoColor *cc, GdkColor *c)
{
gdouble r, g, b;
g_return_if_fail (c && cc);
r = cc->r * 65535.0;
g = cc->g * 65535.0;
b = cc->b * 65535.0;
c->red = r;
c->green = g;
c->blue = b;
}
void
ge_gtk_style_to_cairo_color_cube (GtkStyle * style, CairoColorCube *cube)
{
int i;
g_return_if_fail (style && cube);
for (i = 0; i < 5; i++)
{
ge_gdk_color_to_cairo (&style->bg[i], &cube->bg[i]);
ge_gdk_color_to_cairo (&style->fg[i], &cube->fg[i]);
ge_gdk_color_to_cairo (&style->dark[i], &cube->dark[i]);
ge_gdk_color_to_cairo (&style->light[i], &cube->light[i]);
ge_gdk_color_to_cairo (&style->mid[i], &cube->mid[i]);
ge_gdk_color_to_cairo (&style->base[i], &cube->base[i]);
ge_gdk_color_to_cairo (&style->text[i], &cube->text[i]);
ge_gdk_color_to_cairo (&style->text_aa[i], &cube->text_aa[i]);
}
cube->black.r = cube->black.g = cube->black.b = 0;
cube->black.a = 1;
cube->white.r = cube->white.g = cube->white.b = 1;
cube->white.a = 1;
}
void
ge_shade_color(const CairoColor *base, gdouble shade_ratio, CairoColor *composite)
{
gdouble hue = 0;
gdouble saturation = 0;
gdouble brightness = 0;
g_return_if_fail (base && composite);
ge_hsb_from_color (base, &hue, &saturation, &brightness);
brightness = MIN(brightness*shade_ratio, 1.0);
brightness = MAX(brightness, 0.0);
saturation = MIN(saturation*shade_ratio, 1.0);
saturation = MAX(saturation, 0.0);
ge_color_from_hsb (hue, saturation, brightness, composite);
composite->a = base->a;
}
void
ge_saturate_color (const CairoColor *base, gdouble saturate_level, CairoColor *composite)
{
gdouble hue = 0;
gdouble saturation = 0;
gdouble brightness = 0;
g_return_if_fail (base && composite);
ge_hsb_from_color (base, &hue, &saturation, &brightness);
saturation = MIN(saturation*saturate_level, 1.0);
saturation = MAX(saturation, 0.0);
ge_color_from_hsb (hue, saturation, brightness, composite);
composite->a = base->a;
}
void
ge_mix_color (const CairoColor *color1, const CairoColor *color2,
gdouble mix_factor, CairoColor *composite)
{
g_return_if_fail (color1 && color2 && composite);
composite->r = color1->r * (1-mix_factor) + color2->r * mix_factor;
composite->g = color1->g * (1-mix_factor) + color2->g * mix_factor;
composite->b = color1->b * (1-mix_factor) + color2->b * mix_factor;
composite->a = 1.0;
}
cairo_t *
ge_gdk_drawable_to_cairo (GdkDrawable *window, GdkRectangle *area)
{
cairo_t *cr;
g_return_val_if_fail (window != NULL, NULL);
cr = (cairo_t*) gdk_cairo_create (window);
cairo_set_line_width (cr, 1.0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
if (area)
{
cairo_rectangle (cr, area->x, area->y, area->width, area->height);
cairo_clip_preserve (cr);
cairo_new_path (cr);
}
return cr;
}
void
ge_cairo_set_color (cairo_t *cr, const CairoColor *color)
{
g_return_if_fail (cr && color);
cairo_set_source_rgba (cr, color->r, color->g, color->b, color->a);
}
void
ge_cairo_set_gdk_color_with_alpha (cairo_t *cr, const GdkColor *color, gdouble alpha)
{
g_return_if_fail (cr && color);
cairo_set_source_rgba (cr, color->red / 65535.0,
color->green / 65535.0,
color->blue / 65535.0,
alpha);
}
void
ge_cairo_pattern_add_color_stop_color (cairo_pattern_t *pattern,
gfloat offset,
const CairoColor *color)
{
g_return_if_fail (pattern && color);
cairo_pattern_add_color_stop_rgba (pattern, offset, color->r, color->g, color->b, color->a);
}
void
ge_cairo_pattern_add_color_stop_shade(cairo_pattern_t *pattern,
gdouble offset,
const CairoColor *color,
gdouble shade)
{
CairoColor shaded;
g_return_if_fail (pattern && color && (shade >= 0) && (shade <= 3));
shaded = *color;
if (shade != 1)
{
ge_shade_color(color, shade, &shaded);
}
ge_cairo_pattern_add_color_stop_color(pattern, offset, &shaded);
}
/* This function will draw a rounded corner at position x,y. If the radius
* is very small (or negative) it will instead just do a line_to.
* ge_cairo_rounded_corner assumes clockwise drawing. */
void
ge_cairo_rounded_corner (cairo_t *cr,
double x,
double y,
double radius,
CairoCorners corner)
{
if (radius < 0.0001)
{
cairo_line_to (cr, x, y);
}
else
{
switch (corner) {
case CR_CORNER_NONE:
cairo_line_to (cr, x, y);
break;
case CR_CORNER_TOPLEFT:
cairo_arc (cr, x + radius, y + radius, radius, G_PI, G_PI * 3/2);
break;
case CR_CORNER_TOPRIGHT:
cairo_arc (cr, x - radius, y + radius, radius, G_PI * 3/2, G_PI * 2);
break;
case CR_CORNER_BOTTOMRIGHT:
cairo_arc (cr, x - radius, y - radius, radius, 0, G_PI * 1/2);
break;
case CR_CORNER_BOTTOMLEFT:
cairo_arc (cr, x + radius, y - radius, radius, G_PI * 1/2, G_PI);
break;
default:
/* A bitfield and not a sane value ... */
g_assert_not_reached ();
cairo_line_to (cr, x, y);
return;
}
}
}
void
ge_cairo_rounded_rectangle (cairo_t *cr,
double x, double y, double w, double h,
double radius, CairoCorners corners)
{
g_return_if_fail (cr != NULL);
if (radius < 0.0001 || corners == CR_CORNER_NONE)
{
cairo_rectangle (cr, x, y, w, h);
return;
}
#ifdef DEVELOPMENT
if ((corners == CR_CORNER_ALL) && (radius > w / 2.0 || radius > h / 2.0))
g_warning ("Radius is too large for width/height in ge_rounded_rectangle.\n");
else if (radius > w || radius > h) /* This isn't perfect. Assumes that only one corner is set. */
g_warning ("Radius is too large for width/height in ge_rounded_rectangle.\n");
#endif
if (corners & CR_CORNER_TOPLEFT)
cairo_move_to (cr, x+radius, y);
else
cairo_move_to (cr, x, y);
if (corners & CR_CORNER_TOPRIGHT)
cairo_arc (cr, x+w-radius, y+radius, radius, G_PI * 1.5, G_PI * 2);
else
cairo_line_to (cr, x+w, y);
if (corners & CR_CORNER_BOTTOMRIGHT)
cairo_arc (cr, x+w-radius, y+h-radius, radius, 0, G_PI * 0.5);
else
cairo_line_to (cr, x+w, y+h);
if (corners & CR_CORNER_BOTTOMLEFT)
cairo_arc (cr, x+radius, y+h-radius, radius, G_PI * 0.5, G_PI);
else
cairo_line_to (cr, x, y+h);
if (corners & CR_CORNER_TOPLEFT)
cairo_arc (cr, x+radius, y+radius, radius, G_PI, G_PI * 1.5);
else
cairo_line_to (cr, x, y);
}
/* ge_cairo_stroke_rectangle.
*
* A simple function to stroke the rectangle { x, y, w, h}.
* (This function only exists because of a cairo performance bug that
* has been fixed and it may be a good idea to get rid of it again.)
*/
void
ge_cairo_stroke_rectangle (cairo_t *cr, double x, double y, double w, double h)
{
cairo_rectangle (cr, x, y, w, h);
cairo_stroke (cr);
}
/***********************************************
* ge_cairo_simple_border -
*
* A simple routine to draw thin squared
* borders with a topleft and bottomright color.
*
* It originated in Smooth-Engine.
***********************************************/
void
ge_cairo_simple_border (cairo_t *cr,
const CairoColor * tl, const CairoColor * br,
gint x, gint y, gint width, gint height,
gboolean topleft_overlap)
{
gboolean solid_color;
g_return_if_fail (cr != NULL);
g_return_if_fail (tl != NULL);
g_return_if_fail (br != NULL);
solid_color = (tl == br) || ((tl->r == br->r) && (tl->g == br->g) && (tl->b == br->b) && (tl->a == br->a));
topleft_overlap &= !solid_color;
cairo_save(cr);
cairo_set_line_width (cr, 1);
if (topleft_overlap)
{
ge_cairo_set_color(cr, br);
cairo_move_to(cr, x + 0.5, y + height - 0.5);
cairo_line_to(cr, x + width - 0.5, y + height - 0.5);
cairo_line_to(cr, x + width - 0.5, y + 0.5);
cairo_stroke (cr);
}
ge_cairo_set_color(cr, tl);
cairo_move_to(cr, x + 0.5, y + height - 0.5);
cairo_line_to(cr, x + 0.5, y + 0.5);
cairo_line_to(cr, x + width - 0.5, y + 0.5);
if (!topleft_overlap)
{
if (!solid_color)
{
cairo_stroke(cr);
ge_cairo_set_color(cr, br);
}
cairo_move_to(cr, x + 0.5, y + height - 0.5);
cairo_line_to(cr, x + width - 0.5, y + height - 0.5);
cairo_line_to(cr, x + width - 0.5, y + 0.5);
}
cairo_stroke(cr);
cairo_restore(cr);
}
void ge_cairo_polygon (cairo_t *cr,
const CairoColor *color,
GdkPoint *points,
gint npoints)
{
int i = 0;
cairo_save(cr);
ge_cairo_set_color(cr, color);
cairo_move_to(cr, points[0].x, points[0].y);
for (i = 1; i < npoints; i++)
{
if (!((points[i].x == points[i + 1].x) &&
(points[i].y == points[i + 1].y)))
{
cairo_line_to(cr, points[i].x, points[i].y);
}
}
if ((points[npoints-1].x != points[0].y) ||
(points[npoints-1].y != points[0].y))
{
cairo_line_to(cr, points[0].x, points[0].y);
}
cairo_fill(cr);
cairo_restore(cr);
}
void ge_cairo_line (cairo_t *cr,
const CairoColor *color,
gint x1,
gint y1,
gint x2,
gint y2)
{
cairo_save(cr);
ge_cairo_set_color(cr, color);
cairo_set_line_width (cr, 1);
cairo_move_to(cr, x1 + 0.5, y1 + 0.5);
cairo_line_to(cr, x2 + 0.5, y2 + 0.5);
cairo_stroke(cr);
cairo_restore(cr);
}
void
ge_cairo_mirror (cairo_t *cr,
CairoMirror mirror,
gint *x,
gint *y,
gint *width,
gint *height)
{
cairo_matrix_t matrix;
cairo_matrix_init_identity (&matrix);
cairo_translate (cr, *x, *y);
*x = 0;
*y = 0;
if (mirror & CR_MIRROR_HORIZONTAL)
{
cairo_matrix_scale (&matrix, -1, 1);
*x = -*width;
}
if (mirror & CR_MIRROR_VERTICAL)
{
cairo_matrix_scale (&matrix, 1, -1);
*y = -*height;
}
cairo_transform (cr, &matrix);
}
void
ge_cairo_exchange_axis (cairo_t *cr,
gint *x,
gint *y,
gint *width,
gint *height)
{
gint tmp;
cairo_matrix_t matrix;
cairo_translate (cr, *x, *y);
cairo_matrix_init (&matrix, 0, 1, 1, 0, 0, 0);
cairo_transform (cr, &matrix);
/* swap width/height */
tmp = *width;
*x = 0;
*y = 0;
*width = *height;
*height = tmp;
}
/***********************************************
* ge_cairo_pattern_fill -
*
* Fill an area with some pattern
* Scaling or tiling if needed
***********************************************/
void
ge_cairo_pattern_fill(cairo_t *canvas,
CairoPattern *pattern,
gint x,
gint y,
gint width,
gint height)
{
cairo_matrix_t original_matrix, current_matrix;
if (pattern->operator == CAIRO_OPERATOR_DEST)
{
return;
}
cairo_pattern_get_matrix(pattern->handle, &original_matrix);
current_matrix = original_matrix;
if (pattern->scale != GE_DIRECTION_NONE)
{
gdouble scale_x = 1.0;
gdouble scale_y = 1.0;
if ((pattern->scale == GE_DIRECTION_VERTICAL) || (pattern->scale == GE_DIRECTION_BOTH))
{
scale_x = 1.0/width;
}
if ((pattern->scale == GE_DIRECTION_HORIZONTAL) || (pattern->scale == GE_DIRECTION_BOTH))
{
scale_y = 1.0/height;
}
cairo_matrix_scale(&current_matrix, scale_x, scale_y);
}
if (pattern->translate != GE_DIRECTION_NONE)
{
gdouble translate_x = 0;
gdouble translate_y = 0;
if ((pattern->translate == GE_DIRECTION_VERTICAL) || (pattern->translate == GE_DIRECTION_BOTH))
{
translate_x = 0.0-x;
}
if ((pattern->translate == GE_DIRECTION_HORIZONTAL) || (pattern->translate == GE_DIRECTION_BOTH))
{
translate_y = 0.0-y;
}
cairo_matrix_translate(&current_matrix, translate_x, translate_y);
}
cairo_pattern_set_matrix(pattern->handle, &current_matrix);
cairo_save(canvas);
cairo_set_source(canvas, pattern->handle);
cairo_set_operator(canvas, pattern->operator);
cairo_rectangle(canvas, x, y, width, height);
cairo_fill (canvas);
cairo_restore(canvas);
cairo_pattern_set_matrix(pattern->handle, &original_matrix);
}
/***********************************************
* ge_cairo_color_pattern -
*
* Create A Solid Color Pattern
***********************************************/
CairoPattern*
ge_cairo_color_pattern(CairoColor *base)
{
CairoPattern * result = g_new0(CairoPattern, 1);
#if ((CAIRO_VERSION_MAJOR < 1) || ((CAIRO_VERSION_MAJOR == 1) && (CAIRO_VERSION_MINOR < 2)))
result->type = CAIRO_PATTERN_TYPE_SOLID;
#endif
result->scale = GE_DIRECTION_NONE;
result->translate = GE_DIRECTION_NONE;
result->handle = cairo_pattern_create_rgba(base->r,
base->g,
base->b,
base->a);
result->operator = CAIRO_OPERATOR_SOURCE;
return result;
}
/***********************************************
* ge_cairo_pixbuf_pattern -
*
* Create A Tiled Pixbuf Pattern
***********************************************/
CairoPattern*
ge_cairo_pixbuf_pattern(GdkPixbuf *pixbuf)
{
CairoPattern * result = g_new0(CairoPattern, 1);
cairo_t *canvas;
cairo_surface_t * surface;
gint width, height;
#if ((CAIRO_VERSION_MAJOR < 1) || ((CAIRO_VERSION_MAJOR == 1) && (CAIRO_VERSION_MINOR < 2)))
result->type = CAIRO_PATTERN_TYPE_SURFACE;
#endif
result->scale = GE_DIRECTION_NONE;
result->translate = GE_DIRECTION_BOTH;
width = gdk_pixbuf_get_width(pixbuf);
height = gdk_pixbuf_get_height(pixbuf);
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
canvas = cairo_create(surface);
gdk_cairo_set_source_pixbuf (canvas, pixbuf, 0, 0);
cairo_rectangle (canvas, 0, 0, width, height);
cairo_fill (canvas);
cairo_destroy(canvas);
result->handle = cairo_pattern_create_for_surface (surface);
cairo_surface_destroy(surface);
cairo_pattern_set_extend (result->handle, CAIRO_EXTEND_REPEAT);
result->operator = CAIRO_OPERATOR_SOURCE;
return result;
}
/***********************************************
* ge_cairo_pixmap_pattern -
*
* Create A Tiled Pixmap Pattern
***********************************************/
CairoPattern*
ge_cairo_pixmap_pattern(GdkPixmap *pixmap)
{
CairoPattern * result = NULL;
GdkPixbuf * pixbuf;
gint width, height;
gdk_drawable_get_size (GDK_DRAWABLE (pixmap), &width, &height);
pixbuf = gdk_pixbuf_get_from_drawable(NULL, GDK_DRAWABLE (pixmap),
gdk_drawable_get_colormap(GDK_DRAWABLE (pixmap)),
0, 0, 0, 0, width, height);
result = ge_cairo_pixbuf_pattern(pixbuf);
g_object_unref (pixbuf);
return result;
}
/***********************************************
* ge_cairo_linear_shade_gradient_pattern -
*
* Create A Linear Shade Gradient Pattern
* Aka Smooth Shade Gradient, from/to gradient
* With End points defined as shades of the
* base color
***********************************************/
CairoPattern *
ge_cairo_linear_shade_gradient_pattern(CairoColor *base,
gdouble shade1,
gdouble shade2,
gboolean vertical)
{
CairoPattern * result = g_new0(CairoPattern, 1);
#if ((CAIRO_VERSION_MAJOR < 1) || ((CAIRO_VERSION_MAJOR == 1) && (CAIRO_VERSION_MINOR < 2)))
result->type = CAIRO_PATTERN_TYPE_LINEAR;
#endif
if (vertical)
{
result->scale = GE_DIRECTION_VERTICAL;
result->handle = cairo_pattern_create_linear(0, 0, 1, 0);
}
else
{
result->scale = GE_DIRECTION_HORIZONTAL;
result->handle = cairo_pattern_create_linear(0, 0, 0, 1);
}
result->translate = GE_DIRECTION_BOTH;
result->operator = CAIRO_OPERATOR_SOURCE;
ge_cairo_pattern_add_color_stop_shade(result->handle, 0, base, shade1);
ge_cairo_pattern_add_color_stop_shade(result->handle, 1, base, shade2);
return result;
}
void
ge_cairo_pattern_destroy(CairoPattern *pattern)
{
if (pattern)
{
if (pattern->handle)
cairo_pattern_destroy(pattern->handle);
g_free(pattern);
}
}
/* The following function will be called by GTK+ when the module
* is loaded and checks to see if we are compatible with the
* version of GTK+ that loads us.
*/
GE_EXPORT const gchar* g_module_check_init (GModule *module);
const gchar*
g_module_check_init (GModule *module)
{
(void) module;
return gtk_check_version (GTK_MAJOR_VERSION,
GTK_MINOR_VERSION,
GTK_MICRO_VERSION - GTK_INTERFACE_AGE);
}