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309 lines
8.4 KiB
C
309 lines
8.4 KiB
C
/* ninesliceprivate.h
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*
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* Copyright 2017 Timm Bäder <mail@baedert.org>
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* Copyright 2021 Christian Hergert <chergert@redhat.com>
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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 2.1 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 program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#pragma once
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#include "gskgltextureprivate.h"
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#if 0
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# define DEBUG_NINE_SLICE
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#endif
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G_BEGIN_DECLS
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enum {
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NINE_SLICE_TOP_LEFT = 0,
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NINE_SLICE_TOP_CENTER = 1,
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NINE_SLICE_TOP_RIGHT = 2,
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NINE_SLICE_LEFT_CENTER = 3,
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NINE_SLICE_CENTER = 4,
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NINE_SLICE_RIGHT_CENTER = 5,
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NINE_SLICE_BOTTOM_LEFT = 6,
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NINE_SLICE_BOTTOM_CENTER = 7,
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NINE_SLICE_BOTTOM_RIGHT = 8,
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};
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static inline bool G_GNUC_PURE
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nine_slice_is_visible (const GskGLTextureNineSlice *slice)
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{
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return slice->rect.width > 0 && slice->rect.height > 0;
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}
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static inline void
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nine_slice_rounded_rect (GskGLTextureNineSlice *slices,
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const GskRoundedRect *rect)
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{
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const graphene_point_t *origin = &rect->bounds.origin;
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const graphene_size_t *size = &rect->bounds.size;
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int top_height = ceilf (MAX (rect->corner[GSK_CORNER_TOP_LEFT].height,
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rect->corner[GSK_CORNER_TOP_RIGHT].height));
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int bottom_height = ceilf (MAX (rect->corner[GSK_CORNER_BOTTOM_LEFT].height,
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rect->corner[GSK_CORNER_BOTTOM_RIGHT].height));
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int right_width = ceilf (MAX (rect->corner[GSK_CORNER_TOP_RIGHT].width,
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rect->corner[GSK_CORNER_BOTTOM_RIGHT].width));
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int left_width = ceilf (MAX (rect->corner[GSK_CORNER_TOP_LEFT].width,
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rect->corner[GSK_CORNER_BOTTOM_LEFT].width));
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/* Top left */
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slices[0].rect.x = origin->x;
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slices[0].rect.y = origin->y;
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slices[0].rect.width = left_width;
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slices[0].rect.height = top_height;
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/* Top center */
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slices[1].rect.x = origin->x + size->width / 2.0 - 0.5;
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slices[1].rect.y = origin->y;
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slices[1].rect.width = 1;
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slices[1].rect.height = top_height;
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/* Top right */
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slices[2].rect.x = origin->x + size->width - right_width;
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slices[2].rect.y = origin->y;
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slices[2].rect.width = right_width;
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slices[2].rect.height = top_height;
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/* Left center */
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slices[3].rect.x = origin->x;
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slices[3].rect.y = origin->y + size->height / 2;
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slices[3].rect.width = left_width;
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slices[3].rect.height = 1;
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/* center */
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slices[4].rect.x = origin->x + size->width / 2.0 - 0.5;
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slices[4].rect.y = origin->y + size->height / 2.0 - 0.5;
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slices[4].rect.width = 1;
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slices[4].rect.height = 1;
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/* Right center */
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slices[5].rect.x = origin->x + size->width - right_width;
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slices[5].rect.y = origin->y + (size->height / 2.0) - 0.5;
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slices[5].rect.width = right_width;
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slices[5].rect.height = 1;
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/* Bottom Left */
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slices[6].rect.x = origin->x;
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slices[6].rect.y = origin->y + size->height - bottom_height;
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slices[6].rect.width = left_width;
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slices[6].rect.height = bottom_height;
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/* Bottom center */
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slices[7].rect.x = origin->x + (size->width / 2.0) - 0.5;
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slices[7].rect.y = origin->y + size->height - bottom_height;
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slices[7].rect.width = 1;
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slices[7].rect.height = bottom_height;
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/* Bottom right */
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slices[8].rect.x = origin->x + size->width - right_width;
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slices[8].rect.y = origin->y + size->height - bottom_height;
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slices[8].rect.width = right_width;
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slices[8].rect.height = bottom_height;
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#ifdef DEBUG_NINE_SLICE
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/* These only hold true when the values from ceilf() above
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* are greater than one. Otherwise they fail, like will happen
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* with the node editor viewing the textures zoomed out.
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*/
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if (size->width > 1)
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g_assert_cmpfloat (size->width, >=, left_width + right_width);
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if (size->height > 1)
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g_assert_cmpfloat (size->height, >=, top_height + bottom_height);
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#endif
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}
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static inline void
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nine_slice_to_texture_coords (GskGLTextureNineSlice *slices,
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int texture_width,
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int texture_height)
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{
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float fw = texture_width;
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float fh = texture_height;
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for (guint i = 0; i < 9; i++)
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{
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GskGLTextureNineSlice *slice = &slices[i];
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slice->area.x = slice->rect.x / fw;
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slice->area.y = 1.0 - ((slice->rect.y + slice->rect.height) / fh);
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slice->area.x2 = ((slice->rect.x + slice->rect.width) / fw);
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slice->area.y2 = (1.0 - (slice->rect.y / fh));
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#ifdef DEBUG_NINE_SLICE
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g_assert_cmpfloat (slice->area.x, >=, 0);
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g_assert_cmpfloat (slice->area.x, <=, 1);
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g_assert_cmpfloat (slice->area.y, >=, 0);
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g_assert_cmpfloat (slice->area.y, <=, 1);
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g_assert_cmpfloat (slice->area.x2, >, slice->area.x);
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g_assert_cmpfloat (slice->area.y2, >, slice->area.y);
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#endif
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}
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}
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static inline void
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nine_slice_grow (GskGLTextureNineSlice *slices,
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int amount_x,
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int amount_y)
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{
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if (amount_x == 0 && amount_y == 0)
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return;
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/* top left */
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slices[0].rect.x -= amount_x;
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slices[0].rect.y -= amount_y;
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if (amount_x > slices[0].rect.width)
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slices[0].rect.width += amount_x * 2;
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else
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slices[0].rect.width += amount_x;
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if (amount_y > slices[0].rect.height)
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slices[0].rect.height += amount_y * 2;
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else
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slices[0].rect.height += amount_y;
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/* Top center */
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slices[1].rect.y -= amount_y;
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if (amount_y > slices[1].rect.height)
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slices[1].rect.height += amount_y * 2;
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else
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slices[1].rect.height += amount_y;
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/* top right */
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slices[2].rect.y -= amount_y;
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if (amount_x > slices[2].rect.width)
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{
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slices[2].rect.x -= amount_x;
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slices[2].rect.width += amount_x * 2;
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}
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else
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{
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slices[2].rect.width += amount_x;
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}
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if (amount_y > slices[2].rect.height)
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slices[2].rect.height += amount_y * 2;
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else
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slices[2].rect.height += amount_y;
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slices[3].rect.x -= amount_x;
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if (amount_x > slices[3].rect.width)
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slices[3].rect.width += amount_x * 2;
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else
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slices[3].rect.width += amount_x;
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/* Leave center alone */
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if (amount_x > slices[5].rect.width)
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{
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slices[5].rect.x -= amount_x;
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slices[5].rect.width += amount_x * 2;
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}
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else
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{
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slices[5].rect.width += amount_x;
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}
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/* Bottom left */
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slices[6].rect.x -= amount_x;
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if (amount_x > slices[6].rect.width)
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{
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slices[6].rect.width += amount_x * 2;
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}
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else
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{
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slices[6].rect.width += amount_x;
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}
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if (amount_y > slices[6].rect.height)
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{
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slices[6].rect.y -= amount_y;
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slices[6].rect.height += amount_y * 2;
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}
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else
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{
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slices[6].rect.height += amount_y;
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}
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/* Bottom center */
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if (amount_y > slices[7].rect.height)
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{
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slices[7].rect.y -= amount_y;
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slices[7].rect.height += amount_y * 2;
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}
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else
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{
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slices[7].rect.height += amount_y;
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}
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if (amount_x > slices[8].rect.width)
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{
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slices[8].rect.x -= amount_x;
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slices[8].rect.width += amount_x * 2;
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}
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else
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{
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slices[8].rect.width += amount_x;
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}
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if (amount_y > slices[8].rect.height)
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{
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slices[8].rect.y -= amount_y;
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slices[8].rect.height += amount_y * 2;
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}
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else
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{
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slices[8].rect.height += amount_y;
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}
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#ifdef DEBUG_NINE_SLICE
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/* These cannot be relied on in all cases right now, specifically
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* when viewing data zoomed out.
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*/
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for (guint i = 0; i < 9; i ++)
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{
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g_assert_cmpint (slices[i].rect.x, >=, 0);
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g_assert_cmpint (slices[i].rect.y, >=, 0);
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g_assert_cmpint (slices[i].rect.width, >=, 0);
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g_assert_cmpint (slices[i].rect.height, >=, 0);
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}
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/* Rows don't overlap */
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for (guint i = 0; i < 3; i++)
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{
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int lhs = slices[i * 3 + 0].rect.x + slices[i * 3 + 0].rect.width;
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int rhs = slices[i * 3 + 1].rect.x;
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/* Ignore the case where we are scaled out and the
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* positioning is degenerate, such as from node-editor.
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*/
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if (rhs > 1)
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g_assert_cmpint (lhs, <, rhs);
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}
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#endif
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}
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G_END_DECLS
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