jean
/
Learning_GTK4_tree
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Learning_GTK4_tree/gsk/gl/gskglglyphlibrary.c

442 lines
14 KiB
C
Raw Blame History

/* gskglglyphlibrary.c
*
* Copyright 2020 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
*/
#include "config.h"
#include <gdk/gdkglcontextprivate.h>
#include <gdk/gdkmemoryformatprivate.h>
#include <gdk/gdkprofilerprivate.h>
#include "gskglcommandqueueprivate.h"
#include "gskgldriverprivate.h"
#include "gskglglyphlibraryprivate.h"
#include "gskdebugprivate.h"
#define MAX_GLYPH_SIZE 128
G_DEFINE_TYPE (GskGLGlyphLibrary, gsk_gl_glyph_library, GSK_TYPE_GL_TEXTURE_LIBRARY)
GskGLGlyphLibrary *
gsk_gl_glyph_library_new (GskGLDriver *driver)
{
g_return_val_if_fail (GSK_IS_GL_DRIVER (driver), NULL);
return g_object_new (GSK_TYPE_GL_GLYPH_LIBRARY,
"driver", driver,
NULL);
}
static guint
gsk_gl_glyph_key_hash (gconstpointer data)
{
const GskGLGlyphKey *key = data;
/* We do not store the hash within the key because GHashTable will already
* store the hash value for us and so this is called only a single time per
* cached item. This saves an extra 4 bytes per GskGLGlyphKey which means on
* 64-bit, we fit nicely within 2 pointers (the smallest allocation size
* for GSlice).
*/
return GPOINTER_TO_UINT (key->font) ^
key->glyph ^
(key->xshift << 24) ^
(key->yshift << 26) ^
key->scale;
}
static gboolean
gsk_gl_glyph_key_equal (gconstpointer v1,
gconstpointer v2)
{
return memcmp (v1, v2, sizeof (GskGLGlyphKey)) == 0;
}
static void
gsk_gl_glyph_key_free (gpointer data)
{
GskGLGlyphKey *key = data;
g_clear_object (&key->font);
g_free (key);
}
static void
gsk_gl_glyph_value_free (gpointer data)
{
g_free (data);
}
static void
gsk_gl_glyph_library_clear_cache (GskGLTextureLibrary *library)
{
GskGLGlyphLibrary *self = (GskGLGlyphLibrary *)library;
g_assert (GSK_IS_GL_GLYPH_LIBRARY (self));
memset (self->front, 0, sizeof self->front);
}
static void
gsk_gl_glyph_library_init_atlas (GskGLTextureLibrary *self,
GskGLTextureAtlas *atlas)
{
gboolean packed G_GNUC_UNUSED;
int x, y;
guint gl_format;
guint gl_type;
guint8 pixel_data[4 * 3 * 3];
g_assert (GSK_IS_GL_GLYPH_LIBRARY (self));
g_assert (atlas != NULL);
/* Insert a single pixel at 0,0 for use in coloring */
gdk_gl_context_push_debug_group_printf (gdk_gl_context_get_current (),
"Initializing Atlas");
packed = gsk_gl_texture_library_allocate (self, atlas, 3, 3, &x, &y);
g_assert (packed);
g_assert (x == 0 && y == 0);
memset (pixel_data, 255, sizeof pixel_data);
if (!gdk_gl_context_has_bgra (gdk_gl_context_get_current ())
#if G_BYTE_ORDER == G_BIG_ENDIAN
|| gdk_gl_context_get_use_es (gdk_gl_context_get_current ())
#endif
)
{
gl_format = GL_RGBA;
gl_type = GL_UNSIGNED_BYTE;
}
else
{
gl_format = GL_BGRA;
gl_type = GL_UNSIGNED_BYTE;
}
glBindTexture (GL_TEXTURE_2D, atlas->texture_id);
glTexSubImage2D (GL_TEXTURE_2D, 0,
0, 0,
3, 3,
gl_format, gl_type,
pixel_data);
gdk_gl_context_pop_debug_group (gdk_gl_context_get_current ());
self->driver->command_queue->n_uploads++;
}
static void
gsk_gl_glyph_library_finalize (GObject *object)
{
GskGLGlyphLibrary *self = (GskGLGlyphLibrary *)object;
g_clear_pointer (&self->surface_data, g_free);
G_OBJECT_CLASS (gsk_gl_glyph_library_parent_class)->finalize (object);
}
static void
gsk_gl_glyph_library_class_init (GskGLGlyphLibraryClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GskGLTextureLibraryClass *library_class = GSK_GL_TEXTURE_LIBRARY_CLASS (klass);
object_class->finalize = gsk_gl_glyph_library_finalize;
library_class->clear_cache = gsk_gl_glyph_library_clear_cache;
library_class->init_atlas = gsk_gl_glyph_library_init_atlas;
}
static void
gsk_gl_glyph_library_init (GskGLGlyphLibrary *self)
{
GskGLTextureLibrary *tl = (GskGLTextureLibrary *)self;
tl->max_entry_size = MAX_GLYPH_SIZE;
gsk_gl_texture_library_set_funcs (tl,
gsk_gl_glyph_key_hash,
gsk_gl_glyph_key_equal,
gsk_gl_glyph_key_free,
gsk_gl_glyph_value_free);
}
static cairo_surface_t *
gsk_gl_glyph_library_create_surface (GskGLGlyphLibrary *self,
int stride,
int width,
int height,
int uwidth,
int uheight)
{
cairo_surface_t *surface;
gsize n_bytes;
g_assert (GSK_IS_GL_GLYPH_LIBRARY (self));
g_assert (width > 0);
g_assert (height > 0);
n_bytes = stride * height;
if G_LIKELY (n_bytes > self->surface_data_len)
{
self->surface_data = g_realloc (self->surface_data, n_bytes);
self->surface_data_len = n_bytes;
}
memset (self->surface_data, 0, n_bytes);
surface = cairo_image_surface_create_for_data (self->surface_data,
CAIRO_FORMAT_ARGB32,
width, height, stride);
cairo_surface_set_device_scale (surface, width / (double)uwidth, height / (double)uheight);
return surface;
}
static void
render_glyph (cairo_surface_t *surface,
const GskGLGlyphKey *key,
const GskGLGlyphValue *value)
{
cairo_t *cr;
PangoGlyphString glyph_string;
PangoGlyphInfo glyph_info;
g_assert (surface != NULL);
cr = cairo_create (surface);
cairo_set_source_rgba (cr, 1, 1, 1, 1);
glyph_info.glyph = key->glyph;
glyph_info.geometry.width = value->ink_rect.width * 1024;
glyph_info.geometry.x_offset = (0.25 * key->xshift - value->ink_rect.x) * 1024;
glyph_info.geometry.y_offset = (0.25 * key->yshift - value->ink_rect.y) * 1024;
glyph_string.num_glyphs = 1;
glyph_string.glyphs = &glyph_info;
pango_cairo_show_glyph_string (cr, key->font, &glyph_string);
cairo_destroy (cr);
cairo_surface_flush (surface);
}
static void
gsk_gl_glyph_library_upload_glyph (GskGLGlyphLibrary *self,
const GskGLGlyphKey *key,
const GskGLGlyphValue *value,
int packed_x,
int packed_y,
int width,
int height,
int uwidth,
int uheight)
{
GskGLTextureLibrary *tl = (GskGLTextureLibrary *)self;
G_GNUC_UNUSED gint64 start_time = GDK_PROFILER_CURRENT_TIME;
cairo_surface_t *surface;
guchar *pixel_data;
guchar *free_data = NULL;
guint gl_format;
guint gl_type;
guint texture_id;
gsize stride;
g_assert (GSK_IS_GL_GLYPH_LIBRARY (self));
g_assert (key != NULL);
g_assert (value != NULL);
stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, width);
gdk_gl_context_push_debug_group_printf (gdk_gl_context_get_current (),
"Uploading glyph %d",
key->glyph);
surface = gsk_gl_glyph_library_create_surface (self, stride, width, height, uwidth, uheight);
render_glyph (surface, key, value);
texture_id = GSK_GL_TEXTURE_ATLAS_ENTRY_TEXTURE (value);
g_assert (texture_id > 0);
if (G_UNLIKELY (!gdk_gl_context_has_bgra (gdk_gl_context_get_current ())))
{
pixel_data = free_data = g_malloc (width * height * 4);
gdk_memory_convert (pixel_data, width * 4,
GDK_MEMORY_R8G8B8A8_PREMULTIPLIED,
cairo_image_surface_get_data (surface),
stride,
GDK_MEMORY_DEFAULT,
width, height);
stride = width * 4;
gl_format = GL_RGBA;
gl_type = GL_UNSIGNED_BYTE;
}
else
{
pixel_data = cairo_image_surface_get_data (surface);
gl_format = GL_BGRA;
gl_type = GL_UNSIGNED_BYTE;
}
glPixelStorei (GL_UNPACK_ROW_LENGTH, stride / 4);
glBindTexture (GL_TEXTURE_2D, texture_id);
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x + 1, packed_y + 1,
width, height,
gl_format, gl_type,
pixel_data);
/* Padding top */
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x + 1, packed_y,
width, 1,
gl_format, gl_type,
pixel_data);
/* Padding left */
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x, packed_y + 1,
1, height,
gl_format, gl_type,
pixel_data);
/* Padding top left */
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x, packed_y,
1, 1,
gl_format, gl_type,
pixel_data);
/* Padding right */
glPixelStorei (GL_UNPACK_ROW_LENGTH, width);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, width - 1);
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x + width + 1, packed_y + 1,
1, height,
gl_format, gl_type,
pixel_data);
/* Padding top right */
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x + width + 1, packed_y,
1, 1,
gl_format, gl_type,
pixel_data);
/* Padding bottom */
glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei (GL_UNPACK_SKIP_ROWS, height - 1);
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x + 1, packed_y + 1 + height,
width, 1,
gl_format, gl_type,
pixel_data);
/* Padding bottom left */
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x, packed_y + 1 + height,
1, 1,
gl_format, gl_type,
pixel_data);
/* Padding bottom right */
glPixelStorei (GL_UNPACK_ROW_LENGTH, width);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, width - 1);
glTexSubImage2D (GL_TEXTURE_2D, 0,
packed_x + 1 + width, packed_y + 1 + height,
1, 1,
gl_format, gl_type,
pixel_data);
/* Reset this */
glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
cairo_surface_destroy (surface);
g_free (free_data);
gdk_gl_context_pop_debug_group (gdk_gl_context_get_current ());
tl->driver->command_queue->n_uploads++;
if (gdk_profiler_is_running ())
{
char message[64];
g_snprintf (message, sizeof message, "Size %dx%d", width, height);
gdk_profiler_add_mark (start_time, GDK_PROFILER_CURRENT_TIME-start_time, "Upload Glyph", message);
}
}
gboolean
gsk_gl_glyph_library_add (GskGLGlyphLibrary *self,
GskGLGlyphKey *key,
const GskGLGlyphValue **out_value)
{
GskGLTextureLibrary *tl = (GskGLTextureLibrary *)self;
PangoRectangle ink_rect;
GskGLGlyphValue *value;
int width;
int height;
guint packed_x;
guint packed_y;
g_assert (GSK_IS_GL_GLYPH_LIBRARY (self));
g_assert (key != NULL);
g_assert (out_value != NULL);
pango_font_get_glyph_extents (key->font, key->glyph, &ink_rect, NULL);
pango_extents_to_pixels (&ink_rect, NULL);
ink_rect.x -= 1;
ink_rect.width += 2;
ink_rect.y -= 1;
ink_rect.height += 2;
width = (int) ceil (ink_rect.width * key->scale / 1024.0);
height = (int) ceil (ink_rect.height * key->scale / 1024.0);
GSK_DEBUG (GLYPH_CACHE, "font %p glyph %u: %u x %u pixels", key->font, key->glyph, width, height);
value = gsk_gl_texture_library_pack (tl,
key,
sizeof *value,
width,
height,
1,
&packed_x, &packed_y);
memcpy (&value->ink_rect, &ink_rect, sizeof ink_rect);
if (key->scale > 0 && width > 0 && height > 0)
gsk_gl_glyph_library_upload_glyph (self,
key,
value,
packed_x,
packed_y,
width,
height,
ink_rect.width,
ink_rect.height);
*out_value = value;
return GSK_GL_TEXTURE_ATLAS_ENTRY_TEXTURE (value) != 0;
}
Reference in New Issue View Git Blame Copy Permalink