2 #include "general-support.h"
3 #include "cairo-support.h"
5 /***********************************************
8 * Get HSB values from RGB values.
10 * Modified from Smooth but originated in GTK+
11 ***********************************************/
13 ge_hsb_from_color (const CairoColor *color,
18 gdouble min, max, delta;
19 gdouble red, green, blue;
28 min = MIN(green, blue);
32 max = MAX(green, blue);
36 *brightness = (max + min) / 2;
38 if (fabs(max - min) < 0.0001)
45 if (*brightness <= 0.5)
46 *saturation = (max - min) / (max + min);
48 *saturation = (max - min) / (2 - max - min);
53 *hue = (green - blue) / delta;
54 else if (green == max)
55 *hue = 2 + (blue - red) / delta;
57 *hue = 4 + (red - green) / delta;
65 /***********************************************
68 * Get RGB values from HSB values.
70 * Modified from Smooth but originated in GTK+
71 ***********************************************/
72 #define MODULA(number, divisor) (((gint)number % divisor) + (number - (gint)number))
74 ge_color_from_hsb (gdouble hue,
80 gdouble hue_shift[3], color_shift[3];
85 if (brightness <= 0.5)
86 m2 = brightness * (1 + saturation);
88 m2 = brightness + saturation - brightness * saturation;
90 m1 = 2 * brightness - m2;
92 hue_shift[0] = hue + 120;
94 hue_shift[2] = hue - 120;
96 color_shift[0] = color_shift[1] = color_shift[2] = brightness;
98 i = (saturation == 0)?3:0;
105 m3 = MODULA(m3, 360);
107 m3 = 360 - MODULA(ABS(m3), 360);
110 color_shift[i] = m1 + (m2 - m1) * m3 / 60;
114 color_shift[i] = m1 + (m2 - m1) * (240 - m3) / 60;
119 color->r = color_shift[0];
120 color->g = color_shift[1];
121 color->b = color_shift[2];
126 ge_gdk_color_to_cairo (const GdkColor *c, CairoColor *cc)
130 g_return_if_fail (c && cc);
132 r = c->red / 65535.0;
133 g = c->green / 65535.0;
134 b = c->blue / 65535.0;
143 ge_cairo_color_to_gtk (const CairoColor *cc, GdkColor *c)
147 g_return_if_fail (c && cc);
159 ge_gtk_style_to_cairo_color_cube (GtkStyle * style, CairoColorCube *cube)
163 g_return_if_fail (style && cube);
165 for (i = 0; i < 5; i++)
167 ge_gdk_color_to_cairo (&style->bg[i], &cube->bg[i]);
168 ge_gdk_color_to_cairo (&style->fg[i], &cube->fg[i]);
170 ge_gdk_color_to_cairo (&style->dark[i], &cube->dark[i]);
171 ge_gdk_color_to_cairo (&style->light[i], &cube->light[i]);
172 ge_gdk_color_to_cairo (&style->mid[i], &cube->mid[i]);
174 ge_gdk_color_to_cairo (&style->base[i], &cube->base[i]);
175 ge_gdk_color_to_cairo (&style->text[i], &cube->text[i]);
176 ge_gdk_color_to_cairo (&style->text_aa[i], &cube->text_aa[i]);
179 cube->black.r = cube->black.g = cube->black.b = 0;
182 cube->white.r = cube->white.g = cube->white.b = 1;
187 ge_shade_color(const CairoColor *base, gdouble shade_ratio, CairoColor *composite)
190 gdouble saturation = 0;
191 gdouble brightness = 0;
193 g_return_if_fail (base && composite);
195 ge_hsb_from_color (base, &hue, &saturation, &brightness);
197 brightness = MIN(brightness*shade_ratio, 1.0);
198 brightness = MAX(brightness, 0.0);
200 saturation = MIN(saturation*shade_ratio, 1.0);
201 saturation = MAX(saturation, 0.0);
203 ge_color_from_hsb (hue, saturation, brightness, composite);
204 composite->a = base->a;
208 ge_saturate_color (const CairoColor *base, gdouble saturate_level, CairoColor *composite)
211 gdouble saturation = 0;
212 gdouble brightness = 0;
214 g_return_if_fail (base && composite);
216 ge_hsb_from_color (base, &hue, &saturation, &brightness);
218 saturation = MIN(saturation*saturate_level, 1.0);
219 saturation = MAX(saturation, 0.0);
221 ge_color_from_hsb (hue, saturation, brightness, composite);
222 composite->a = base->a;
226 ge_mix_color (const CairoColor *color1, const CairoColor *color2,
227 gdouble mix_factor, CairoColor *composite)
229 g_return_if_fail (color1 && color2 && composite);
231 composite->r = color1->r * (1-mix_factor) + color2->r * mix_factor;
232 composite->g = color1->g * (1-mix_factor) + color2->g * mix_factor;
233 composite->b = color1->b * (1-mix_factor) + color2->b * mix_factor;
238 ge_gdk_drawable_to_cairo (GdkDrawable *window, GdkRectangle *area)
242 g_return_val_if_fail (window != NULL, NULL);
244 cr = (cairo_t*) gdk_cairo_create (window);
245 cairo_set_line_width (cr, 1.0);
246 cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
247 cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
251 cairo_rectangle (cr, area->x, area->y, area->width, area->height);
252 cairo_clip_preserve (cr);
260 ge_cairo_set_color (cairo_t *cr, const CairoColor *color)
262 g_return_if_fail (cr && color);
264 cairo_set_source_rgba (cr, color->r, color->g, color->b, color->a);
268 ge_cairo_set_gdk_color_with_alpha (cairo_t *cr, const GdkColor *color, gdouble alpha)
270 g_return_if_fail (cr && color);
272 cairo_set_source_rgba (cr, color->red / 65535.0,
273 color->green / 65535.0,
274 color->blue / 65535.0,
279 ge_cairo_pattern_add_color_stop_color (cairo_pattern_t *pattern,
281 const CairoColor *color)
283 g_return_if_fail (pattern && color);
285 cairo_pattern_add_color_stop_rgba (pattern, offset, color->r, color->g, color->b, color->a);
289 ge_cairo_pattern_add_color_stop_shade(cairo_pattern_t *pattern,
291 const CairoColor *color,
296 g_return_if_fail (pattern && color && (shade >= 0) && (shade <= 3));
302 ge_shade_color(color, shade, &shaded);
305 ge_cairo_pattern_add_color_stop_color(pattern, offset, &shaded);
308 /* This function will draw a rounded corner at position x,y. If the radius
309 * is very small (or negative) it will instead just do a line_to.
310 * ge_cairo_rounded_corner assumes clockwise drawing. */
312 ge_cairo_rounded_corner (cairo_t *cr,
320 cairo_line_to (cr, x, y);
326 cairo_line_to (cr, x, y);
328 case CR_CORNER_TOPLEFT:
329 cairo_arc (cr, x + radius, y + radius, radius, G_PI, G_PI * 3/2);
331 case CR_CORNER_TOPRIGHT:
332 cairo_arc (cr, x - radius, y + radius, radius, G_PI * 3/2, G_PI * 2);
334 case CR_CORNER_BOTTOMRIGHT:
335 cairo_arc (cr, x - radius, y - radius, radius, 0, G_PI * 1/2);
337 case CR_CORNER_BOTTOMLEFT:
338 cairo_arc (cr, x + radius, y - radius, radius, G_PI * 1/2, G_PI);
342 /* A bitfield and not a sane value ... */
343 g_assert_not_reached ();
344 cairo_line_to (cr, x, y);
351 ge_cairo_rounded_rectangle (cairo_t *cr,
352 double x, double y, double w, double h,
353 double radius, CairoCorners corners)
355 g_return_if_fail (cr != NULL);
357 if (radius < 0.0001 || corners == CR_CORNER_NONE)
359 cairo_rectangle (cr, x, y, w, h);
363 if ((corners == CR_CORNER_ALL) && (radius > w / 2.0 || radius > h / 2.0))
364 g_warning ("Radius is too large for width/height in ge_rounded_rectangle.\n");
365 else if (radius > w || radius > h) /* This isn't perfect. Assumes that only one corner is set. */
366 g_warning ("Radius is too large for width/height in ge_rounded_rectangle.\n");
369 if (corners & CR_CORNER_TOPLEFT)
370 cairo_move_to (cr, x+radius, y);
372 cairo_move_to (cr, x, y);
374 if (corners & CR_CORNER_TOPRIGHT)
375 cairo_arc (cr, x+w-radius, y+radius, radius, G_PI * 1.5, G_PI * 2);
377 cairo_line_to (cr, x+w, y);
379 if (corners & CR_CORNER_BOTTOMRIGHT)
380 cairo_arc (cr, x+w-radius, y+h-radius, radius, 0, G_PI * 0.5);
382 cairo_line_to (cr, x+w, y+h);
384 if (corners & CR_CORNER_BOTTOMLEFT)
385 cairo_arc (cr, x+radius, y+h-radius, radius, G_PI * 0.5, G_PI);
387 cairo_line_to (cr, x, y+h);
389 if (corners & CR_CORNER_TOPLEFT)
390 cairo_arc (cr, x+radius, y+radius, radius, G_PI, G_PI * 1.5);
392 cairo_line_to (cr, x, y);
396 /* ge_cairo_stroke_rectangle.
398 * A simple function to stroke the rectangle { x, y, w, h}.
399 * (This function only exists because of a cairo performance bug that
400 * has been fixed and it may be a good idea to get rid of it again.)
403 ge_cairo_stroke_rectangle (cairo_t *cr, double x, double y, double w, double h)
405 cairo_rectangle (cr, x, y, w, h);
409 /***********************************************
410 * ge_cairo_simple_border -
412 * A simple routine to draw thin squared
413 * borders with a topleft and bottomright color.
415 * It originated in Smooth-Engine.
416 ***********************************************/
418 ge_cairo_simple_border (cairo_t *cr,
419 const CairoColor * tl, const CairoColor * br,
420 gint x, gint y, gint width, gint height,
421 gboolean topleft_overlap)
423 gboolean solid_color;
425 g_return_if_fail (cr != NULL);
426 g_return_if_fail (tl != NULL);
427 g_return_if_fail (br != NULL);
430 solid_color = (tl == br) || ((tl->r == br->r) && (tl->g == br->g) && (tl->b == br->b) && (tl->a == br->a));
432 topleft_overlap &= !solid_color;
436 cairo_set_line_width (cr, 1);
440 ge_cairo_set_color(cr, br);
442 cairo_move_to(cr, x + 0.5, y + height - 0.5);
443 cairo_line_to(cr, x + width - 0.5, y + height - 0.5);
444 cairo_line_to(cr, x + width - 0.5, y + 0.5);
449 ge_cairo_set_color(cr, tl);
451 cairo_move_to(cr, x + 0.5, y + height - 0.5);
452 cairo_line_to(cr, x + 0.5, y + 0.5);
453 cairo_line_to(cr, x + width - 0.5, y + 0.5);
455 if (!topleft_overlap)
460 ge_cairo_set_color(cr, br);
463 cairo_move_to(cr, x + 0.5, y + height - 0.5);
464 cairo_line_to(cr, x + width - 0.5, y + height - 0.5);
465 cairo_line_to(cr, x + width - 0.5, y + 0.5);
473 void ge_cairo_polygon (cairo_t *cr,
474 const CairoColor *color,
482 ge_cairo_set_color(cr, color);
483 cairo_move_to(cr, points[0].x, points[0].y);
485 for (i = 1; i < npoints; i++)
487 if (!((points[i].x == points[i + 1].x) &&
488 (points[i].y == points[i + 1].y)))
490 cairo_line_to(cr, points[i].x, points[i].y);
494 if ((points[npoints-1].x != points[0].x) ||
495 (points[npoints-1].y != points[0].y))
497 cairo_line_to(cr, points[0].x, points[0].y);
505 void ge_cairo_line (cairo_t *cr,
506 const CairoColor *color,
514 ge_cairo_set_color(cr, color);
515 cairo_set_line_width (cr, 1);
517 cairo_move_to(cr, x1 + 0.5, y1 + 0.5);
518 cairo_line_to(cr, x2 + 0.5, y2 + 0.5);
526 ge_cairo_mirror (cairo_t *cr,
533 cairo_matrix_t matrix;
535 cairo_matrix_init_identity (&matrix);
537 cairo_translate (cr, *x, *y);
541 if (mirror & CR_MIRROR_HORIZONTAL)
543 cairo_matrix_scale (&matrix, -1, 1);
546 if (mirror & CR_MIRROR_VERTICAL)
548 cairo_matrix_scale (&matrix, 1, -1);
552 cairo_transform (cr, &matrix);
556 ge_cairo_exchange_axis (cairo_t *cr,
563 cairo_matrix_t matrix;
565 cairo_translate (cr, *x, *y);
566 cairo_matrix_init (&matrix, 0, 1, 1, 0, 0, 0);
568 cairo_transform (cr, &matrix);
570 /* swap width/height */
579 /***********************************************
580 * ge_cairo_pattern_fill -
582 * Fill an area with some pattern
583 * Scaling or tiling if needed
584 ***********************************************/
586 ge_cairo_pattern_fill(cairo_t *canvas,
587 CairoPattern *pattern,
593 cairo_matrix_t original_matrix, current_matrix;
595 if (pattern->operator == CAIRO_OPERATOR_DEST)
600 cairo_pattern_get_matrix(pattern->handle, &original_matrix);
601 current_matrix = original_matrix;
603 if (pattern->scale != GE_DIRECTION_NONE)
605 gdouble scale_x = 1.0;
606 gdouble scale_y = 1.0;
608 if ((pattern->scale == GE_DIRECTION_VERTICAL) || (pattern->scale == GE_DIRECTION_BOTH))
613 if ((pattern->scale == GE_DIRECTION_HORIZONTAL) || (pattern->scale == GE_DIRECTION_BOTH))
615 scale_y = 1.0/height;
618 cairo_matrix_scale(¤t_matrix, scale_x, scale_y);
621 if (pattern->translate != GE_DIRECTION_NONE)
623 gdouble translate_x = 0;
624 gdouble translate_y = 0;
626 if ((pattern->translate == GE_DIRECTION_VERTICAL) || (pattern->translate == GE_DIRECTION_BOTH))
631 if ((pattern->translate == GE_DIRECTION_HORIZONTAL) || (pattern->translate == GE_DIRECTION_BOTH))
636 cairo_matrix_translate(¤t_matrix, translate_x, translate_y);
639 cairo_pattern_set_matrix(pattern->handle, ¤t_matrix);
643 cairo_set_source(canvas, pattern->handle);
644 cairo_set_operator(canvas, pattern->operator);
645 cairo_rectangle(canvas, x, y, width, height);
649 cairo_restore(canvas);
651 cairo_pattern_set_matrix(pattern->handle, &original_matrix);
654 /***********************************************
655 * ge_cairo_color_pattern -
657 * Create A Solid Color Pattern
658 ***********************************************/
660 ge_cairo_color_pattern(CairoColor *base)
662 CairoPattern * result = g_new0(CairoPattern, 1);
664 #if ((CAIRO_VERSION_MAJOR < 1) || ((CAIRO_VERSION_MAJOR == 1) && (CAIRO_VERSION_MINOR < 2)))
665 result->type = CAIRO_PATTERN_TYPE_SOLID;
668 result->scale = GE_DIRECTION_NONE;
669 result->translate = GE_DIRECTION_NONE;
671 result->handle = cairo_pattern_create_rgba(base->r,
676 result->operator = CAIRO_OPERATOR_SOURCE;
681 /***********************************************
682 * ge_cairo_pixbuf_pattern -
684 * Create A Tiled Pixbuf Pattern
685 ***********************************************/
687 ge_cairo_pixbuf_pattern(GdkPixbuf *pixbuf)
689 CairoPattern * result = g_new0(CairoPattern, 1);
692 cairo_surface_t * surface;
695 #if ((CAIRO_VERSION_MAJOR < 1) || ((CAIRO_VERSION_MAJOR == 1) && (CAIRO_VERSION_MINOR < 2)))
696 result->type = CAIRO_PATTERN_TYPE_SURFACE;
699 result->scale = GE_DIRECTION_NONE;
700 result->translate = GE_DIRECTION_BOTH;
702 width = gdk_pixbuf_get_width(pixbuf);
703 height = gdk_pixbuf_get_height(pixbuf);
705 surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
707 canvas = cairo_create(surface);
709 gdk_cairo_set_source_pixbuf (canvas, pixbuf, 0, 0);
710 cairo_rectangle (canvas, 0, 0, width, height);
712 cairo_destroy(canvas);
714 result->handle = cairo_pattern_create_for_surface (surface);
715 cairo_surface_destroy(surface);
717 cairo_pattern_set_extend (result->handle, CAIRO_EXTEND_REPEAT);
719 result->operator = CAIRO_OPERATOR_SOURCE;
724 /***********************************************
725 * ge_cairo_pixmap_pattern -
727 * Create A Tiled Pixmap Pattern
728 ***********************************************/
730 ge_cairo_pixmap_pattern(GdkPixmap *pixmap)
732 CairoPattern * result = NULL;
737 gdk_drawable_get_size (GDK_DRAWABLE (pixmap), &width, &height);
739 pixbuf = gdk_pixbuf_get_from_drawable(NULL, GDK_DRAWABLE (pixmap),
740 gdk_drawable_get_colormap(GDK_DRAWABLE (pixmap)),
741 0, 0, 0, 0, width, height);
743 result = ge_cairo_pixbuf_pattern(pixbuf);
745 g_object_unref (pixbuf);
750 /***********************************************
751 * ge_cairo_linear_shade_gradient_pattern -
753 * Create A Linear Shade Gradient Pattern
754 * Aka Smooth Shade Gradient, from/to gradient
755 * With End points defined as shades of the
757 ***********************************************/
759 ge_cairo_linear_shade_gradient_pattern(CairoColor *base,
764 CairoPattern * result = g_new0(CairoPattern, 1);
766 #if ((CAIRO_VERSION_MAJOR < 1) || ((CAIRO_VERSION_MAJOR == 1) && (CAIRO_VERSION_MINOR < 2)))
767 result->type = CAIRO_PATTERN_TYPE_LINEAR;
772 result->scale = GE_DIRECTION_VERTICAL;
774 result->handle = cairo_pattern_create_linear(0, 0, 1, 0);
778 result->scale = GE_DIRECTION_HORIZONTAL;
780 result->handle = cairo_pattern_create_linear(0, 0, 0, 1);
783 result->translate = GE_DIRECTION_BOTH;
784 result->operator = CAIRO_OPERATOR_SOURCE;
786 ge_cairo_pattern_add_color_stop_shade(result->handle, 0, base, shade1);
787 ge_cairo_pattern_add_color_stop_shade(result->handle, 1, base, shade2);
793 ge_cairo_pattern_destroy(CairoPattern *pattern)
798 cairo_pattern_destroy(pattern->handle);
804 /* The following function will be called by GTK+ when the module
805 * is loaded and checks to see if we are compatible with the
806 * version of GTK+ that loads us.
808 GE_EXPORT const gchar* g_module_check_init (GModule *module);
810 g_module_check_init (GModule *module)
814 return gtk_check_version (GTK_MAJOR_VERSION,
816 GTK_MICRO_VERSION - GTK_INTERFACE_AGE);