diff options
Diffstat (limited to 'gtk-engine/src/cairo-support.c')
| -rw-r--r-- | gtk-engine/src/cairo-support.c | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/gtk-engine/src/cairo-support.c b/gtk-engine/src/cairo-support.c new file mode 100644 index 0000000..5c90547 --- /dev/null +++ b/gtk-engine/src/cairo-support.c @@ -0,0 +1,454 @@ +#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 (max == min) + { + *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 (GdkColor *c, CairoColor *cc) +{ + gdouble r, g, b; + + g_return_if_fail (c && cc); + + r = c->red / 65536.0; + g = c->green / 65536.0; + b = c->blue / 65536.0; + + cc->r = r; + cc->g = g; + cc->b = b; + cc->a = 1.0; +} + +void +ge_cairo_color_to_gtk (CairoColor *cc, GdkColor *c) +{ + gdouble r, g, b; + + g_return_if_fail (c && cc); + + r = cc->r * 65536.0; + g = cc->g * 65536.0; + b = cc->b * 65536.0; + + 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; +} + +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, CairoColor *color) +{ + g_return_if_fail (cr && color); + + cairo_set_source_rgba (cr, color->r, color->g, color->b, color->a); +} + +void +ge_cairo_pattern_add_color_stop_color (cairo_pattern_t *pattern, gfloat offset, 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_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) + { + cairo_rectangle (cr, x, y, w, h); + return; + } + + 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, M_PI * 1.5, M_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, M_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, M_PI * 0.5, M_PI); + else + cairo_line_to (cr, x, y+h); + + if (corners & CR_CORNER_TOPLEFT) + cairo_arc (cr, x+radius, y+radius, radius, M_PI, M_PI * 1.5); + else + cairo_line_to (cr, x, y); +} + +/*********************************************** + * 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, + CairoColor * tl, 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, + 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, + 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); + + if (mirror & CR_MIRROR_HORIZONTAL) + { + cairo_matrix_scale (&matrix, -1, 1); + cairo_matrix_translate (&matrix, *width, 0); + } + if (mirror & CR_MIRROR_VERTICAL) + { + cairo_matrix_scale (&matrix, 1, -1); + cairo_matrix_translate (&matrix, 0, *height); + } + + cairo_transform (cr, &matrix); +} + +/* 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. + */ +G_MODULE_EXPORT const gchar* g_module_check_init (GModule *module); +const gchar* +g_module_check_init (GModule *module) +{ + return gtk_check_version (GTK_MAJOR_VERSION, + GTK_MINOR_VERSION, + GTK_MICRO_VERSION - GTK_INTERFACE_AGE); +} |