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-rw-r--r--gsk/gl/ninesliceprivate.h310
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+/* ninesliceprivate.h
+ *
+ * Copyright 2017 Timm Bäder <mail@baedert.org>
+ * Copyright 2021 Christian Hergert <chergert@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef __NINE_SLICE_PRIVATE_H__
+#define __NINE_SLICE_PRIVATE_H__
+
+#include "gskgltextureprivate.h"
+
+#if 0
+# define DEBUG_NINE_SLICE
+#endif
+
+G_BEGIN_DECLS
+
+enum {
+ NINE_SLICE_TOP_LEFT = 0,
+ NINE_SLICE_TOP_CENTER = 1,
+ NINE_SLICE_TOP_RIGHT = 2,
+ NINE_SLICE_LEFT_CENTER = 3,
+ NINE_SLICE_CENTER = 4,
+ NINE_SLICE_RIGHT_CENTER = 5,
+ NINE_SLICE_BOTTOM_LEFT = 6,
+ NINE_SLICE_BOTTOM_CENTER = 7,
+ NINE_SLICE_BOTTOM_RIGHT = 8,
+};
+
+static inline bool G_GNUC_PURE
+nine_slice_is_visible (const GskGLTextureNineSlice *slice)
+{
+ return slice->rect.width > 0 && slice->rect.height > 0;
+}
+
+static inline void
+nine_slice_rounded_rect (GskGLTextureNineSlice *slices,
+ const GskRoundedRect *rect)
+{
+ const graphene_point_t *origin = &rect->bounds.origin;
+ const graphene_size_t *size = &rect->bounds.size;
+ int top_height = ceilf (MAX (rect->corner[GSK_CORNER_TOP_LEFT].height,
+ rect->corner[GSK_CORNER_TOP_RIGHT].height));
+ int bottom_height = ceilf (MAX (rect->corner[GSK_CORNER_BOTTOM_LEFT].height,
+ rect->corner[GSK_CORNER_BOTTOM_RIGHT].height));
+ int right_width = ceilf (MAX (rect->corner[GSK_CORNER_TOP_RIGHT].width,
+ rect->corner[GSK_CORNER_BOTTOM_RIGHT].width));
+ int left_width = ceilf (MAX (rect->corner[GSK_CORNER_TOP_LEFT].width,
+ rect->corner[GSK_CORNER_BOTTOM_LEFT].width));
+
+ /* Top left */
+ slices[0].rect.x = origin->x;
+ slices[0].rect.y = origin->y;
+ slices[0].rect.width = left_width;
+ slices[0].rect.height = top_height;
+
+ /* Top center */
+ slices[1].rect.x = origin->x + size->width / 2.0 - 0.5;
+ slices[1].rect.y = origin->y;
+ slices[1].rect.width = 1;
+ slices[1].rect.height = top_height;
+
+ /* Top right */
+ slices[2].rect.x = origin->x + size->width - right_width;
+ slices[2].rect.y = origin->y;
+ slices[2].rect.width = right_width;
+ slices[2].rect.height = top_height;
+
+ /* Left center */
+ slices[3].rect.x = origin->x;
+ slices[3].rect.y = origin->y + size->height / 2;
+ slices[3].rect.width = left_width;
+ slices[3].rect.height = 1;
+
+ /* center */
+ slices[4].rect.x = origin->x + size->width / 2.0 - 0.5;
+ slices[4].rect.y = origin->y + size->height / 2.0 - 0.5;
+ slices[4].rect.width = 1;
+ slices[4].rect.height = 1;
+
+ /* Right center */
+ slices[5].rect.x = origin->x + size->width - right_width;
+ slices[5].rect.y = origin->y + (size->height / 2.0) - 0.5;
+ slices[5].rect.width = right_width;
+ slices[5].rect.height = 1;
+
+ /* Bottom Left */
+ slices[6].rect.x = origin->x;
+ slices[6].rect.y = origin->y + size->height - bottom_height;
+ slices[6].rect.width = left_width;
+ slices[6].rect.height = bottom_height;
+
+ /* Bottom center */
+ slices[7].rect.x = origin->x + (size->width / 2.0) - 0.5;
+ slices[7].rect.y = origin->y + size->height - bottom_height;
+ slices[7].rect.width = 1;
+ slices[7].rect.height = bottom_height;
+
+ /* Bottom right */
+ slices[8].rect.x = origin->x + size->width - right_width;
+ slices[8].rect.y = origin->y + size->height - bottom_height;
+ slices[8].rect.width = right_width;
+ slices[8].rect.height = bottom_height;
+
+#ifdef DEBUG_NINE_SLICE
+ /* These only hold true when the values from ceilf() above
+ * are greater than one. Otherwise they fail, like will happen
+ * with the node editor viewing the textures zoomed out.
+ */
+ if (size->width > 1)
+ g_assert_cmpfloat (size->width, >=, left_width + right_width);
+ if (size->height > 1)
+ g_assert_cmpfloat (size->height, >=, top_height + bottom_height);
+#endif
+}
+
+static inline void
+nine_slice_to_texture_coords (GskGLTextureNineSlice *slices,
+ int texture_width,
+ int texture_height)
+{
+ float fw = texture_width;
+ float fh = texture_height;
+
+ for (guint i = 0; i < 9; i++)
+ {
+ GskGLTextureNineSlice *slice = &slices[i];
+
+ slice->area.x = slice->rect.x / fw;
+ slice->area.y = 1.0 - ((slice->rect.y + slice->rect.height) / fh);
+ slice->area.x2 = ((slice->rect.x + slice->rect.width) / fw);
+ slice->area.y2 = (1.0 - (slice->rect.y / fh));
+
+#ifdef DEBUG_NINE_SLICE
+ g_assert_cmpfloat (slice->area.x, >=, 0);
+ g_assert_cmpfloat (slice->area.x, <=, 1);
+ g_assert_cmpfloat (slice->area.y, >=, 0);
+ g_assert_cmpfloat (slice->area.y, <=, 1);
+ g_assert_cmpfloat (slice->area.x2, >, slice->area.x);
+ g_assert_cmpfloat (slice->area.y2, >, slice->area.y);
+#endif
+ }
+}
+
+static inline void
+nine_slice_grow (GskGLTextureNineSlice *slices,
+ int amount_x,
+ int amount_y)
+{
+ if (amount_x == 0 && amount_y == 0)
+ return;
+
+ /* top left */
+ slices[0].rect.x -= amount_x;
+ slices[0].rect.y -= amount_y;
+ if (amount_x > slices[0].rect.width)
+ slices[0].rect.width += amount_x * 2;
+ else
+ slices[0].rect.width += amount_x;
+
+ if (amount_y > slices[0].rect.height)
+ slices[0].rect.height += amount_y * 2;
+ else
+ slices[0].rect.height += amount_y;
+
+
+ /* Top center */
+ slices[1].rect.y -= amount_y;
+ if (amount_y > slices[1].rect.height)
+ slices[1].rect.height += amount_y * 2;
+ else
+ slices[1].rect.height += amount_y;
+
+ /* top right */
+ slices[2].rect.y -= amount_y;
+ if (amount_x > slices[2].rect.width)
+ {
+ slices[2].rect.x -= amount_x;
+ slices[2].rect.width += amount_x * 2;
+ }
+ else
+ {
+ slices[2].rect.width += amount_x;
+ }
+
+ if (amount_y > slices[2].rect.height)
+ slices[2].rect.height += amount_y * 2;
+ else
+ slices[2].rect.height += amount_y;
+
+
+
+ slices[3].rect.x -= amount_x;
+ if (amount_x > slices[3].rect.width)
+ slices[3].rect.width += amount_x * 2;
+ else
+ slices[3].rect.width += amount_x;
+
+ /* Leave center alone */
+
+ if (amount_x > slices[5].rect.width)
+ {
+ slices[5].rect.x -= amount_x;
+ slices[5].rect.width += amount_x * 2;
+ }
+ else
+ {
+ slices[5].rect.width += amount_x;
+ }
+
+
+ /* Bottom left */
+ slices[6].rect.x -= amount_x;
+ if (amount_x > slices[6].rect.width)
+ {
+ slices[6].rect.width += amount_x * 2;
+ }
+ else
+ {
+ slices[6].rect.width += amount_x;
+ }
+
+ if (amount_y > slices[6].rect.height)
+ {
+ slices[6].rect.y -= amount_y;
+ slices[6].rect.height += amount_y * 2;
+ }
+ else
+ {
+ slices[6].rect.height += amount_y;
+ }
+
+
+ /* Bottom center */
+ if (amount_y > slices[7].rect.height)
+ {
+ slices[7].rect.y -= amount_y;
+ slices[7].rect.height += amount_y * 2;
+ }
+ else
+ {
+ slices[7].rect.height += amount_y;
+ }
+
+ if (amount_x > slices[8].rect.width)
+ {
+ slices[8].rect.x -= amount_x;
+ slices[8].rect.width += amount_x * 2;
+ }
+ else
+ {
+ slices[8].rect.width += amount_x;
+ }
+
+ if (amount_y > slices[8].rect.height)
+ {
+ slices[8].rect.y -= amount_y;
+ slices[8].rect.height += amount_y * 2;
+ }
+ else
+ {
+ slices[8].rect.height += amount_y;
+ }
+
+#ifdef DEBUG_NINE_SLICE
+ /* These cannot be relied on in all cases right now, specifically
+ * when viewing data zoomed out.
+ */
+ for (guint i = 0; i < 9; i ++)
+ {
+ g_assert_cmpint (slices[i].rect.x, >=, 0);
+ g_assert_cmpint (slices[i].rect.y, >=, 0);
+ g_assert_cmpint (slices[i].rect.width, >=, 0);
+ g_assert_cmpint (slices[i].rect.height, >=, 0);
+ }
+
+ /* Rows don't overlap */
+ for (guint i = 0; i < 3; i++)
+ {
+ int lhs = slices[i * 3 + 0].rect.x + slices[i * 3 + 0].rect.width;
+ int rhs = slices[i * 3 + 1].rect.x;
+
+ /* Ignore the case where we are scaled out and the
+ * positioning is degenerate, such as from node-editor.
+ */
+ if (rhs > 1)
+ g_assert_cmpint (lhs, <, rhs);
+ }
+#endif
+
+}
+
+G_END_DECLS
+
+#endif /* __NINE_SLICE_PRIVATE_H__ */
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