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299 lines
9.1 KiB
C
299 lines
9.1 KiB
C
/* GSK - The GTK Scene Kit
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*
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* Copyright 2016 Endless
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:GskRoundedRect
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* @Title: GskRoundedRect
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* @Short_description: A rounded rectangle
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*
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* #GskRoundedRect defines a rectangle with rounded corners, as is commonly
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* used in drawing.
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*
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* Operations on a #GskRoundedRect will normalize the rectangle, to
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* ensure that the bounds are normalized and that the corner sizes don't exceed
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* the size of the rectangle. The algorithm used for normalizing corner sizes
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* is described in [the CSS specification](https://drafts.csswg.org/css-backgrounds-3/#border-radius).
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*/
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#include "config.h"
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#include "gskroundedrect.h"
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#include "gskdebugprivate.h"
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#include <math.h>
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static void
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gsk_rounded_rect_normalize_in_place (GskRoundedRect *self)
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{
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float factor = 1.0;
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float corners;
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guint i;
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graphene_rect_normalize (&self->bounds);
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for (i = 0; i < 4; i++)
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{
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self->corner[i].width = MAX (self->corner[i].width, 0);
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self->corner[i].height = MAX (self->corner[i].height, 0);
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}
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/* clamp border radius, following CSS specs */
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corners = self->corner[GSK_CORNER_TOP_LEFT].width + self->corner[GSK_CORNER_TOP_RIGHT].width;
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if (corners > self->bounds.size.width)
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factor = MIN (factor, self->bounds.size.width / corners);
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corners = self->corner[GSK_CORNER_TOP_RIGHT].height + self->corner[GSK_CORNER_BOTTOM_RIGHT].height;
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if (corners > self->bounds.size.height)
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factor = MIN (factor, self->bounds.size.height / corners);
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corners = self->corner[GSK_CORNER_BOTTOM_RIGHT].width + self->corner[GSK_CORNER_BOTTOM_LEFT].width;
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if (corners > self->bounds.size.width)
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factor = MIN (factor, self->bounds.size.width / corners);
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corners = self->corner[GSK_CORNER_TOP_LEFT].height + self->corner[GSK_CORNER_BOTTOM_LEFT].height;
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if (corners > self->bounds.size.height)
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factor = MIN (factor, self->bounds.size.height / corners);
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for (i = 0; i < 4; i++)
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graphene_size_scale (&self->corner[i], factor, &self->corner[i]);
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}
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/**
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* gsk_rounded_rect_init:
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* @self: The #GskRoundedRect to initialize
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* @bounds: a #graphene_rect_t describing the bounds
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* @top_left: the rounding radius of the top left corner
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* @top_right: the rounding radius of the top right corner
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* @bottom_right: the rounding radius of the bottom right corner
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* @bottom_left: the rounding radius of the bottom left corner
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*
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* Initializes the given #GskRoundedRect with the given values.
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*
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* This function will implicitly normalize the #GskRoundedRect
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* before returning.
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*
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* Returns: (transfer none): the initialized rectangle
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*
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* Since: 3.90
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*/
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GskRoundedRect *
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gsk_rounded_rect_init (GskRoundedRect *self,
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const graphene_rect_t *bounds,
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const graphene_size_t *top_left,
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const graphene_size_t *top_right,
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const graphene_size_t *bottom_right,
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const graphene_size_t *bottom_left)
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{
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graphene_rect_init_from_rect (&self->bounds, bounds);
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graphene_size_init_from_size (&self->corner[GSK_CORNER_TOP_LEFT], top_left);
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graphene_size_init_from_size (&self->corner[GSK_CORNER_TOP_RIGHT], top_right);
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graphene_size_init_from_size (&self->corner[GSK_CORNER_BOTTOM_RIGHT], bottom_right);
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graphene_size_init_from_size (&self->corner[GSK_CORNER_BOTTOM_LEFT], bottom_left);
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gsk_rounded_rect_normalize_in_place (self);
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return self;
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}
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/**
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* gsk_rounded_rect_init_copy:
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* @self: a #GskRoundedRect
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* @src: a #GskRoundedRect
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*
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* Initializes @self using the given @src rectangle.
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*
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* This function will implicitly normalize the #GskRoundedRect
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* before returning.
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*
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* Returns: (transfer none): the initialized rectangle
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*
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* Since: 3.90
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*/
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GskRoundedRect *
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gsk_rounded_rect_init_copy (GskRoundedRect *self,
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const GskRoundedRect *src)
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{
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*self = *src;
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gsk_rounded_rect_normalize_in_place (self);
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return self;
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}
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/**
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* gsk_rounded_rect_init_from_rect:
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* @self: a #GskRoundedRect
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* @bounds: a #graphene_rect_t
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* @radius: the border radius
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*
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* Initializes @self to the given @bounds and sets the radius of all
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* four corners to @radius.
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*
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* Returns: (transfer none): the initialized rectangle
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**/
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GskRoundedRect *
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gsk_rounded_rect_init_from_rect (GskRoundedRect *self,
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const graphene_rect_t *bounds,
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float radius)
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{
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graphene_size_t corner = GRAPHENE_SIZE_INIT(radius, radius);
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return gsk_rounded_rect_init (self, bounds, &corner, &corner, &corner, &corner);
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}
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/**
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* gsk_rounded_rect_normalize:
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* @self: a #GskRoundedRect
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*
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* Normalizes the passed rectangle.
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*
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* this function will ensure that the bounds of the rectanlge are normalized
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* and ensure that the corner values are positive and the corners do not overlap.
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*
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* Returns: (transfer none): the normalized rectangle
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*
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* Since: 3.90
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*/
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GskRoundedRect *
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gsk_rounded_rect_normalize (GskRoundedRect *self)
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{
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gsk_rounded_rect_normalize_in_place (self);
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return self;
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}
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/**
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* gsk_rounded_rect_offset:
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* @self: a #GskRoundedRect
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* @d_x: the horizontal offset
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* @d_y: the vertical offset
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*
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* Offsets the bound's origin by @dx and @dy.
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*
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* The size and corners of the rectangle are unchanged.
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*
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* Returns: (transfer none): the offset rectangle
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*
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* Since: 3.90
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*/
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GskRoundedRect *
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gsk_rounded_rect_offset (GskRoundedRect *self,
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float dx,
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float dy)
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{
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gsk_rounded_rect_normalize (self);
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self->bounds.origin.x += dx;
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self->bounds.origin.y += dy;
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return self;
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}
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/**
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* gsk_rounded_rect_is_rectilinear:
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* @self: the #GskRoundedRect to check
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*
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* Checks if all corners of @self are right angles and the
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* rectangle covers all of its bounds.
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*
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* This information can be used to decide if gsk_clip_node_new()
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* or gsk_rounded_clip_node_new() should be called.
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*
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* Returns: %TRUE if the rectangle is rectilinear
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**/
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gboolean
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gsk_rounded_rect_is_rectilinear (GskRoundedRect *self)
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{
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guint i;
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for (i = 0; i < 4; i++)
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{
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if (self->corner[i].width > 0 ||
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self->corner[i].height > 0)
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return FALSE;
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}
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return TRUE;
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}
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static void
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append_arc (cairo_t *cr, double angle1, double angle2, gboolean negative)
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{
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if (negative)
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cairo_arc_negative (cr, 0.0, 0.0, 1.0, angle1, angle2);
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else
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cairo_arc (cr, 0.0, 0.0, 1.0, angle1, angle2);
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}
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static void
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_cairo_ellipsis (cairo_t *cr,
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double xc, double yc,
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double xradius, double yradius,
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double angle1, double angle2)
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{
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cairo_matrix_t save;
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if (xradius <= 0.0 || yradius <= 0.0)
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{
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cairo_line_to (cr, xc, yc);
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return;
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}
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cairo_get_matrix (cr, &save);
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cairo_translate (cr, xc, yc);
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cairo_scale (cr, xradius, yradius);
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append_arc (cr, angle1, angle2, FALSE);
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cairo_set_matrix (cr, &save);
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}
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void
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gsk_rounded_rect_path (const GskRoundedRect *self,
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cairo_t *cr)
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{
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cairo_new_sub_path (cr);
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_cairo_ellipsis (cr,
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self->bounds.origin.x + self->corner[GSK_CORNER_TOP_LEFT].width,
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self->bounds.origin.y + self->corner[GSK_CORNER_TOP_LEFT].height,
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self->corner[GSK_CORNER_TOP_LEFT].width,
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self->corner[GSK_CORNER_TOP_LEFT].height,
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G_PI, 3 * G_PI_2);
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_cairo_ellipsis (cr,
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self->bounds.origin.x + self->bounds.size.width - self->corner[GSK_CORNER_TOP_RIGHT].width,
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self->bounds.origin.y + self->corner[GSK_CORNER_TOP_RIGHT].height,
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self->corner[GSK_CORNER_TOP_RIGHT].width,
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self->corner[GSK_CORNER_TOP_RIGHT].height,
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- G_PI_2, 0);
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_cairo_ellipsis (cr,
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self->bounds.origin.x + self->bounds.size.width - self->corner[GSK_CORNER_BOTTOM_RIGHT].width,
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self->bounds.origin.y + self->bounds.size.height - self->corner[GSK_CORNER_BOTTOM_RIGHT].height,
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self->corner[GSK_CORNER_BOTTOM_RIGHT].width,
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self->corner[GSK_CORNER_BOTTOM_RIGHT].height,
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0, G_PI_2);
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_cairo_ellipsis (cr,
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self->bounds.origin.x + self->corner[GSK_CORNER_BOTTOM_LEFT].width,
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self->bounds.origin.y + self->bounds.size.height - self->corner[GSK_CORNER_BOTTOM_LEFT].height,
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self->corner[GSK_CORNER_BOTTOM_LEFT].width,
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self->corner[GSK_CORNER_BOTTOM_LEFT].height,
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G_PI_2, G_PI);
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cairo_close_path (cr);
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}
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