libmks/lib/mks-cairo-framebuffer.c

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/* mks-cairo-framebuffer.c
*
* Copyright 2023 Christian Hergert <chergert@redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include "config.h"
#include <cairo-gobject.h>
#include <gtk/gtk.h>
#include "mks-cairo-framebuffer-private.h"
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#include "mks-util-private.h"
#define TILE_WIDTH 128
#define TILE_HEIGHT 128
struct _MksCairoFramebuffer
{
GObject parent_instance;
/* The underlying surface we'll draw to */
cairo_surface_t *surface;
/* A GBytes that we can use to reference slices which ultimately
* references the cairo surface. This goes against the internal design
* of GdkTexture (which are supposed to be immutable) so that we can
* avoid additional copies beyond the one to the GPU.
*
* We somewhat abuse the GdkSnapshot diffing here by giving a new memory
* texture for tiles that changed even though they will point to the
* same memory. That way the renderer will upload the new contents for
* that area instead of using the previously cached texture.
*/
GBytes *content;
/* The GdkMemoryTexture tiles we'll export using indices
* in the format [row0:col0,col1,.. to rowN:colN]
*/
GPtrArray *tiles;
/* The format our framebuffer uses and corresponding format
* the uploaded textures will use.
*/
cairo_format_t format;
GdkMemoryFormat memory_format;
/* The stride for the framebuffer so that the memory texture
* can skip past the rest of the framebuffer data.
*/
guint stride;
/* Number of bytes per-pixel */
guint bpp;
/* The height and width the framebuffer was created with */
guint height;
guint width;
/* The real width and height when tiling is taken into account */
guint real_height;
guint real_width;
/* The number of tiles horizontally and vertically */
guint n_columns;
guint n_rows;
};
enum {
PROP_0,
PROP_FORMAT,
PROP_HEIGHT,
PROP_WIDTH,
N_PROPS
};
static cairo_user_data_key_t invalidate_key;
static int
mks_cairo_framebuffer_get_intrinsic_width (GdkPaintable *paintable)
{
return mks_cairo_framebuffer_get_width (MKS_CAIRO_FRAMEBUFFER (paintable));
}
static int
mks_cairo_framebuffer_get_intrinsic_height (GdkPaintable *paintable)
{
return mks_cairo_framebuffer_get_height (MKS_CAIRO_FRAMEBUFFER (paintable));
}
static double
mks_cairo_framebuffer_get_intrinsic_aspect_ratio (GdkPaintable *paintable)
{
double width = gdk_paintable_get_intrinsic_width (paintable);
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double height = gdk_paintable_get_intrinsic_height (paintable);
return width / height;
}
static void
mks_cairo_framebuffer_snapshot (GdkPaintable *paintable,
GdkSnapshot *snapshot,
double width,
double height)
{
MksCairoFramebuffer *self = MKS_CAIRO_FRAMEBUFFER (paintable);
gtk_snapshot_save (snapshot);
gtk_snapshot_scale (snapshot,
width / (double)self->width,
height / (double)self->height);
for (guint row = 0; row < self->n_rows; row++)
{
guint row_pos = row * self->n_columns;
for (guint col = 0; col < self->n_columns; col++)
{
guint col_pos = row_pos + col;
if G_UNLIKELY (self->tiles->pdata[col_pos] == NULL)
{
guint tile_y = row * TILE_HEIGHT;
guint tile_x = col * TILE_WIDTH;
gsize byte_offset = (tile_y * self->stride) + (tile_x * self->bpp);
gsize n_bytes = (TILE_HEIGHT-1) * self->stride + (TILE_WIDTH * self->bpp);
g_autoptr(GBytes) bytes = g_bytes_new_from_bytes (self->content, byte_offset, n_bytes);
self->tiles->pdata[col_pos] =
gdk_memory_texture_new (TILE_WIDTH,
TILE_HEIGHT,
self->memory_format,
bytes,
self->stride);
}
gtk_snapshot_append_texture (snapshot,
self->tiles->pdata[col_pos],
&GRAPHENE_RECT_INIT (col * TILE_WIDTH,
row * TILE_HEIGHT,
TILE_WIDTH,
TILE_HEIGHT));
}
}
gtk_snapshot_restore (snapshot);
}
static void
paintable_iface_init (GdkPaintableInterface *iface)
{
iface->get_intrinsic_width = mks_cairo_framebuffer_get_intrinsic_width;
iface->get_intrinsic_height = mks_cairo_framebuffer_get_intrinsic_height;
iface->get_intrinsic_aspect_ratio = mks_cairo_framebuffer_get_intrinsic_aspect_ratio;
iface->snapshot = mks_cairo_framebuffer_snapshot;
}
G_DEFINE_FINAL_TYPE_WITH_CODE (MksCairoFramebuffer, mks_cairo_framebuffer, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE, paintable_iface_init))
static GParamSpec *properties [N_PROPS];
static inline void
realign (guint *value,
guint alignment)
{
guint rem = (*value) % alignment;
if (rem != 0)
*value += (alignment - rem);
}
static void
texture_clear (gpointer data)
{
GdkTexture *texture = data;
if (texture != NULL)
g_object_unref (texture);
}
static void
mks_cairo_framebuffer_constructed (GObject *object)
{
MksCairoFramebuffer *self = (MksCairoFramebuffer *)object;
G_OBJECT_CLASS (mks_cairo_framebuffer_parent_class)->constructed (object);
switch (self->format)
{
case CAIRO_FORMAT_ARGB32:
case CAIRO_FORMAT_RGB24:
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
self->memory_format = GDK_MEMORY_B8G8R8A8_PREMULTIPLIED;
#else
self->memory_format = GDK_MEMORY_A8R8G8B8_PREMULTIPLIED;
#endif
break;
case CAIRO_FORMAT_A8:
case CAIRO_FORMAT_A1:
case CAIRO_FORMAT_RGB16_565:
case CAIRO_FORMAT_RGB30:
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#if _CAIRO_CHECK_VERSION(1, 17, 2)
case CAIRO_FORMAT_RGB96F:
case CAIRO_FORMAT_RGBA128F:
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#endif
case CAIRO_FORMAT_INVALID:
default:
g_warning ("Unsupported memory format from cairo format: 0x%x",
self->format);
return;
}
self->real_width = self->width;
self->real_height = self->height;
realign (&self->real_width, TILE_WIDTH);
realign (&self->real_height, TILE_HEIGHT);
g_assert (self->real_width % TILE_WIDTH == 0);
g_assert (self->real_height % TILE_HEIGHT == 0);
self->surface = cairo_image_surface_create (self->format, self->real_width, self->real_height);
if (self->surface == NULL)
{
g_warning ("Cairo surface creation failed: format=0x%x width=%u height=%u",
self->format, self->real_width, self->real_height);
return;
}
self->stride = cairo_format_stride_for_width (self->format, self->real_width);
self->bpp = self->stride / self->real_width;
/* Currently only 4bbp are supported */
g_assert (self->bpp == 4);
self->content = g_bytes_new_with_free_func (cairo_image_surface_get_data (self->surface),
self->stride * self->real_height,
(GDestroyNotify) cairo_surface_destroy,
cairo_surface_reference (self->surface));
self->n_columns = self->real_width / TILE_WIDTH;
self->n_rows = self->real_height / TILE_HEIGHT;
self->tiles = g_ptr_array_new_full (self->n_columns * self->n_rows, texture_clear);
g_ptr_array_set_size (self->tiles, self->n_columns * self->n_rows);
}
static void
mks_cairo_framebuffer_dispose (GObject *object)
{
MksCairoFramebuffer *self = (MksCairoFramebuffer *)object;
g_clear_pointer (&self->content, g_bytes_unref);
g_clear_pointer (&self->surface, cairo_surface_destroy);
g_clear_pointer (&self->tiles, g_ptr_array_unref);
G_OBJECT_CLASS (mks_cairo_framebuffer_parent_class)->dispose (object);
}
static void
mks_cairo_framebuffer_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MksCairoFramebuffer *self = MKS_CAIRO_FRAMEBUFFER (object);
switch (prop_id)
{
case PROP_FORMAT:
g_value_set_enum (value, mks_cairo_framebuffer_get_format (self));
break;
case PROP_HEIGHT:
g_value_set_uint (value, mks_cairo_framebuffer_get_height (self));
break;
case PROP_WIDTH:
g_value_set_uint (value, mks_cairo_framebuffer_get_width (self));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
mks_cairo_framebuffer_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MksCairoFramebuffer *self = MKS_CAIRO_FRAMEBUFFER (object);
switch (prop_id)
{
case PROP_FORMAT:
self->format = g_value_get_enum (value);
break;
case PROP_HEIGHT:
self->height = g_value_get_uint (value);
break;
case PROP_WIDTH:
self->width = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
mks_cairo_framebuffer_class_init (MksCairoFramebufferClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = mks_cairo_framebuffer_constructed;
object_class->dispose = mks_cairo_framebuffer_dispose;
object_class->get_property = mks_cairo_framebuffer_get_property;
object_class->set_property = mks_cairo_framebuffer_set_property;
properties[PROP_FORMAT] =
g_param_spec_enum ("format", NULL, NULL,
CAIRO_GOBJECT_TYPE_FORMAT,
CAIRO_FORMAT_RGB24,
(G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
properties[PROP_HEIGHT] =
g_param_spec_uint ("height", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
properties[PROP_WIDTH] =
g_param_spec_uint ("width", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
g_object_class_install_properties (object_class, N_PROPS, properties);
}
static void
mks_cairo_framebuffer_init (MksCairoFramebuffer *self)
{
self->format = CAIRO_FORMAT_RGB24;
}
MksCairoFramebuffer *
mks_cairo_framebuffer_new (cairo_format_t format,
guint width,
guint height)
{
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
return g_object_new (MKS_TYPE_CAIRO_FRAMEBUFFER,
"format", format,
"height", height,
"width", width,
NULL);
}
static void
flush_and_invalidate_on_destroy (gpointer data)
{
g_autoptr(MksCairoFramebuffer) self = data;
cairo_surface_flush (self->surface);
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
}
cairo_t *
mks_cairo_framebuffer_update (MksCairoFramebuffer *self,
guint x,
guint y,
guint width,
guint height)
{
cairo_t *cr;
guint col1, col2;
guint row1, row2;
g_return_val_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (self), NULL);
g_return_val_if_fail (self->surface != NULL, NULL);
g_assert (self->n_columns > 0);
g_assert (self->n_rows > 0);
col1 = MIN (x / TILE_WIDTH, self->n_columns-1);
col2 = MIN ((x + width) / TILE_WIDTH, self->n_columns-1);
row1 = MIN (y / TILE_HEIGHT, self->n_rows-1);
row2 = MIN ((y + height) / TILE_HEIGHT, self->n_rows-1);
for (guint row = row1; row <= row2; row++)
{
guint row_pos = row * self->n_columns;
for (guint col = col1; col <= col2; col++)
{
guint col_pos = row_pos + col;
g_assert (col_pos < self->tiles->len);
g_clear_object (&self->tiles->pdata[col_pos]);
}
}
cr = cairo_create (self->surface);
cairo_translate (cr, x, y);
cairo_rectangle (cr, 0, 0, width, height);
cairo_clip (cr);
cairo_set_user_data (cr,
&invalidate_key,
g_object_ref (self),
flush_and_invalidate_on_destroy);
return cr;
}
void
mks_cairo_framebuffer_clear (MksCairoFramebuffer *self)
{
cairo_t *cr;
g_return_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (self));
cr = cairo_create (self->surface);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_rectangle (cr, 0, 0,
self->n_columns * TILE_WIDTH,
self->n_rows * TILE_HEIGHT);
cairo_set_source_rgba (cr, 0, 0, 0, 1);
cairo_paint (cr);
cairo_destroy (cr);
}
cairo_format_t
mks_cairo_framebuffer_get_format (MksCairoFramebuffer *self)
{
g_return_val_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (self), 0);
return self->format;
}
guint
mks_cairo_framebuffer_get_height (MksCairoFramebuffer *self)
{
g_return_val_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (self), 0);
return self->height;
}
guint
mks_cairo_framebuffer_get_width (MksCairoFramebuffer *self)
{
g_return_val_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (self), 0);
return self->width;
}
void
mks_cairo_framebuffer_copy_to (MksCairoFramebuffer *self,
MksCairoFramebuffer *dest)
{
cairo_t *cr;
g_return_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (self));
g_return_if_fail (MKS_IS_CAIRO_FRAMEBUFFER (dest));
cr = cairo_create (dest->surface);
cairo_set_source_surface (cr, self->surface, 0, 0);
cairo_rectangle (cr, 0, 0, self->width, self->height);
//cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_fill (cr);
cairo_destroy (cr);
}