forked from AuroraMiddleware/gtk
121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/* gsknglglyphlibraryprivate.h
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*
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* Copyright 2020 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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#ifndef __GSK_NGL_GLYPH_LIBRARY_PRIVATE_H__
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#define __GSK_NGL_GLYPH_LIBRARY_PRIVATE_H__
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#include <pango/pango.h>
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#include "gskngltexturelibraryprivate.h"
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G_BEGIN_DECLS
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#define GSK_TYPE_GL_GLYPH_LIBRARY (gsk_ngl_glyph_library_get_type())
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typedef struct _GskNglGlyphKey
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{
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PangoFont *font;
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PangoGlyph glyph;
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guint xshift : 3;
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guint yshift : 3;
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guint scale : 26; /* times 1024 */
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} GskNglGlyphKey;
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typedef struct _GskNglGlyphValue
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{
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GskNglTextureAtlasEntry entry;
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PangoRectangle ink_rect;
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} GskNglGlyphValue;
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#if GLIB_SIZEOF_VOID_P == 8
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G_STATIC_ASSERT (sizeof (GskNglGlyphKey) == 16);
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#elif GLIB_SIZEOF_VOID_P == 4
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G_STATIC_ASSERT (sizeof (GskNglGlyphKey) == 12);
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#endif
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G_DECLARE_FINAL_TYPE (GskNglGlyphLibrary, gsk_ngl_glyph_library, GSK, NGL_GLYPH_LIBRARY, GskNglTextureLibrary)
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struct _GskNglGlyphLibrary
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{
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GskNglTextureLibrary parent_instance;
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guint8 *surface_data;
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gsize surface_data_len;
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struct {
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GskNglGlyphKey key;
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const GskNglGlyphValue *value;
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} front[256];
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};
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GskNglGlyphLibrary *gsk_ngl_glyph_library_new (GskNglDriver *driver);
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gboolean gsk_ngl_glyph_library_add (GskNglGlyphLibrary *self,
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GskNglGlyphKey *key,
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const GskNglGlyphValue **out_value);
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static inline int
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gsk_ngl_glyph_key_phase (float value)
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{
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return floorf (4 * (value + 0.125)) - 4 * floorf (value + 0.125);
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}
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static inline void
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gsk_ngl_glyph_key_set_glyph_and_shift (GskNglGlyphKey *key,
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PangoGlyph glyph,
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float x,
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float y)
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{
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key->glyph = glyph;
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key->xshift = gsk_ngl_glyph_key_phase (x);
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key->yshift = gsk_ngl_glyph_key_phase (y);
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}
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static inline gboolean
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gsk_ngl_glyph_library_lookup_or_add (GskNglGlyphLibrary *self,
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const GskNglGlyphKey *key,
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const GskNglGlyphValue **out_value)
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{
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GskNglTextureAtlasEntry *entry;
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guint front_index = ((key->glyph << 2) | key->xshift) & 0xFF;
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if (memcmp (key, &self->front[front_index], sizeof *key) == 0)
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{
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*out_value = self->front[front_index].value;
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}
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else if (gsk_ngl_texture_library_lookup ((GskNglTextureLibrary *)self, key, &entry))
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{
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*out_value = (GskNglGlyphValue *)entry;
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self->front[front_index].key = *key;
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self->front[front_index].value = *out_value;
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}
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else
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{
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GskNglGlyphKey *k = g_slice_copy (sizeof *key, key);
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g_object_ref (k->font);
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gsk_ngl_glyph_library_add (self, k, out_value);
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self->front[front_index].key = *key;
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self->front[front_index].value = *out_value;
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}
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return GSK_NGL_TEXTURE_ATLAS_ENTRY_TEXTURE (*out_value) != 0;
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}
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G_END_DECLS
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#endif /* __GSK_NGL_GLYPH_LIBRARY_PRIVATE_H__ */
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