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gtk2/gtk/gtksnapshot.c
Timm Bäder 05e9a9b572 snapshot: Reorder color matrix nodes containing a transform node 
A color matrix node that contains a transform node can also be expressed
the other way around, as a transform node containing a color matrix
node.

In the general case, the color matrix node will have to draw its
child to a texture so it can color every pixel of that texture, but the
renderers can short-cut this if the child of the color matrix node is
already a texture node. So if we have a node tree like

Color Matrix
    - Transform
        - Texture

The renderer would have to either check the grandchild of the color
matrix or simply fall back to rendering the transform node to a texture.

In the new configuration:

Transform
    - Color Matrix
        - Texture

The renderer can easily see that the child node of the color matrix node
is a texture, and skip rendering it to a texture.

This is for example happening in current Adwaita for spinners, which are
rotated symbolics.
2019-12-03 08:40:34 +01:00

1988 lines
60 KiB
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/* GTK - The GIMP Toolkit
* Copyright (C) 2016 Benjamin Otte <otte@gnome.org>
*
* 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 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 library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtksnapshot.h"
#include "gtksnapshotprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkcssshadowsvalueprivate.h"
#include "gtkdebug.h"
#include "gtkrenderbackgroundprivate.h"
#include "gtkrenderborderprivate.h"
#include "gtkrendericonprivate.h"
#include "gtkrendernodepaintableprivate.h"
#include "gtkstylecontextprivate.h"
#include "gsktransformprivate.h"
#include "gsk/gskrendernodeprivate.h"
#include "gtk/gskpango.h"
/**
* SECTION:gtksnapshot
* @Short_description: Auxiliary object for snapshots
* @Title: GtkSnapshot
*
* GtkSnapshot is an auxiliary object that assists in creating #GskRenderNodes
* in the #GtkWidget::snapshot vfunc. It functions in a similar way to
* a cairo context, and maintains a stack of render nodes and their associated
* transformations.
*
* The node at the top of the stack is the the one that gtk_snapshot_append_…
* functions operate on. Use the gtk_snapshot_push_… functions and gtk_snapshot_pop()
* to change the current node.
*
* The typical way to obtain a GtkSnapshot object is as an argument to
* the #GtkWidget::snapshot vfunc. If you need to create your own GtkSnapshot,
* use gtk_snapshot_new().
*/
G_DEFINE_TYPE (GtkSnapshot, gtk_snapshot, GDK_TYPE_SNAPSHOT)
static void
gtk_snapshot_dispose (GObject *object)
{
GtkSnapshot *snapshot = GTK_SNAPSHOT (object);
if (snapshot->state_stack)
gsk_render_node_unref (gtk_snapshot_to_node (snapshot));
g_assert (snapshot->state_stack == NULL);
g_assert (snapshot->nodes == NULL);
G_OBJECT_CLASS (gtk_snapshot_parent_class)->dispose (object);
}
static void
gtk_snapshot_class_init (GtkSnapshotClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = gtk_snapshot_dispose;
}
static void
gtk_snapshot_init (GtkSnapshot *self)
{
}
static GskRenderNode *
gtk_snapshot_collect_default (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node;
if (n_nodes == 0)
{
node = NULL;
}
else if (n_nodes == 1)
{
node = gsk_render_node_ref (nodes[0]);
}
else
{
node = gsk_container_node_new (nodes, n_nodes);
}
return node;
}
static GtkSnapshotState *
gtk_snapshot_push_state (GtkSnapshot *snapshot,
GskTransform *transform,
GtkSnapshotCollectFunc collect_func)
{
const gsize n_states = snapshot->state_stack->len;
GtkSnapshotState *state;
g_array_set_size (snapshot->state_stack, n_states + 1);
state = &g_array_index (snapshot->state_stack, GtkSnapshotState, n_states);
state->transform = gsk_transform_ref (transform);
state->collect_func = collect_func;
state->start_node_index = snapshot->nodes->len;
state->n_nodes = 0;
return state;
}
static GtkSnapshotState *
gtk_snapshot_get_current_state (const GtkSnapshot *snapshot)
{
g_assert (snapshot->state_stack->len > 0);
return &g_array_index (snapshot->state_stack, GtkSnapshotState, snapshot->state_stack->len - 1);
}
static GtkSnapshotState *
gtk_snapshot_get_previous_state (const GtkSnapshot *snapshot)
{
g_assert (snapshot->state_stack->len > 1);
return &g_array_index (snapshot->state_stack, GtkSnapshotState, snapshot->state_stack->len - 2);
}
static void
gtk_snapshot_state_clear (GtkSnapshotState *state)
{
gsk_transform_unref (state->transform);
}
/**
* gtk_snapshot_new:
*
* Creates a new #GtkSnapshot.
*
* Returns: a newly-allocated #GtkSnapshot
*/
GtkSnapshot *
gtk_snapshot_new (void)
{
GtkSnapshot *snapshot;
snapshot = g_object_new (GTK_TYPE_SNAPSHOT, NULL);
snapshot->from_parent = FALSE;
snapshot->state_stack = g_array_new (FALSE, TRUE, sizeof (GtkSnapshotState));
g_array_set_clear_func (snapshot->state_stack, (GDestroyNotify)gtk_snapshot_state_clear);
snapshot->nodes = g_ptr_array_new_with_free_func ((GDestroyNotify)gsk_render_node_unref);
gtk_snapshot_push_state (snapshot,
NULL,
gtk_snapshot_collect_default);
return snapshot;
}
/* Private. Does the same as _new but does not allocate a NEW
* state/node stack. */
GtkSnapshot *
gtk_snapshot_new_with_parent (GtkSnapshot *parent_snapshot)
{
GtkSnapshot *snapshot = g_object_new (GTK_TYPE_SNAPSHOT, NULL);
snapshot->state_stack = parent_snapshot->state_stack;
snapshot->nodes = parent_snapshot->nodes;
snapshot->from_parent = TRUE;
gtk_snapshot_push_state (snapshot,
NULL,
gtk_snapshot_collect_default);
return snapshot;
}
/**
* gtk_snapshot_free_to_node: (skip)
* @snapshot: (transfer full): a #GtkSnapshot
*
* Returns the node that was constructed by @snapshot
* and frees @snapshot.
*
* Returns: (transfer full): a newly-created #GskRenderNode
*/
GskRenderNode *
gtk_snapshot_free_to_node (GtkSnapshot *snapshot)
{
GskRenderNode *result;
result = gtk_snapshot_to_node (snapshot);
g_object_unref (snapshot);
return result;
}
/**
* gtk_snapshot_free_to_paintable: (skip)
* @snapshot: (transfer full): a #GtkSnapshot
* @size: (allow-none): The size of the resulting paintable
* or %NULL to use the bounds of the snapshot
*
* Returns a paintable for the node that was
* constructed by @snapshot and frees @snapshot.
*
* Returns: (transfer full): a newly-created #GdkPaintable
*/
GdkPaintable *
gtk_snapshot_free_to_paintable (GtkSnapshot *snapshot,
const graphene_size_t *size)
{
GdkPaintable *result;
result = gtk_snapshot_to_paintable (snapshot, size);
g_object_unref (snapshot);
return result;
}
static GskRenderNode *
gtk_snapshot_collect_autopush_transform (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *transform_node;
GtkSnapshotState *previous_state;
previous_state = gtk_snapshot_get_previous_state (snapshot);
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
transform_node = gsk_transform_node_new (node, previous_state->transform);
gsk_render_node_unref (node);
return transform_node;
}
static void
gtk_snapshot_autopush_transform (GtkSnapshot *snapshot)
{
gtk_snapshot_push_state (snapshot,
NULL,
gtk_snapshot_collect_autopush_transform);
}
static gboolean
gtk_snapshot_state_should_autopop (const GtkSnapshotState *state)
{
return state->collect_func == gtk_snapshot_collect_autopush_transform;
}
static GskRenderNode *
gtk_snapshot_collect_debug (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *debug_node;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
if (state->data.debug.message == NULL)
return node;
debug_node = gsk_debug_node_new (node, state->data.debug.message);
gsk_render_node_unref (node);
return debug_node;
}
/**
* gtk_snapshot_push_debug:
* @snapshot: a #GtkSnapshot
* @message: a printf-style format string
* @...: arguments for @message
*
* Inserts a debug node with a message. Debug nodes don't affect
* the rendering at all, but can be helpful in identifying parts
* of a render node tree dump, for example in the GTK inspector.
*/
void
gtk_snapshot_push_debug (GtkSnapshot *snapshot,
const char *message,
...)
{
GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *state;
state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_debug);
if (GTK_DEBUG_CHECK (SNAPSHOT))
{
va_list args;
va_start (args, message);
state->data.debug.message = g_strdup_vprintf (message, args);
va_end (args);
}
else
{
state->data.debug.message = NULL;
}
}
static GskRenderNode *
gtk_snapshot_collect_opacity (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *opacity_node;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
if (state->data.opacity.opacity == 1.0)
{
opacity_node = node;
}
else if (state->data.opacity.opacity == 0.0)
{
gsk_render_node_unref (node);
opacity_node = NULL;
}
else
{
opacity_node = gsk_opacity_node_new (node, state->data.opacity.opacity);
gsk_render_node_unref (node);
}
return opacity_node;
}
/**
* gtk_snapshot_push_opacity:
* @snapshot: a #GtkSnapshot
* @opacity: the opacity to use
*
* Modifies the opacity of an image.
*
* The image is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_opacity (GtkSnapshot *snapshot,
double opacity)
{
GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *state;
state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_opacity);
state->data.opacity.opacity = CLAMP (opacity, 0.0, 1.0);
}
static GskRenderNode *
gtk_snapshot_collect_blur (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *blur_node;
double radius;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
radius = state->data.blur.radius;
if (radius == 0.0)
return node;
blur_node = gsk_blur_node_new (node, radius);
gsk_render_node_unref (node);
return blur_node;
}
/**
* gtk_snapshot_push_blur:
* @snapshot: a #GtkSnapshot
* @radius: the blur radius to use
*
* Blurs an image.
*
* The image is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_blur (GtkSnapshot *snapshot,
double radius)
{
const GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *state;
state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_blur);
state->data.blur.radius = radius;
}
static GskRenderNode *
merge_color_matrix_nodes (const graphene_matrix_t *matrix2,
const graphene_vec4_t *offset2,
GskRenderNode *child)
{
const graphene_matrix_t *mat1 = gsk_color_matrix_node_peek_color_matrix (child);
const graphene_vec4_t *offset1 = gsk_color_matrix_node_peek_color_offset (child);
graphene_matrix_t mat2 = *matrix2;
graphene_vec4_t off2 = *offset2;
GskRenderNode *result;
g_assert (gsk_render_node_get_node_type (child) == GSK_COLOR_MATRIX_NODE);
/* color matrix node: color = mat * p + offset; for a pixel p.
* color = mat1 * (mat2 * p + offset2) + offset1;
* = mat1 * mat2 * p + offset2 * mat1 + offset1
* = (mat1 * mat2) * p + (offset2 * mat1 + offset1)
* Which this code does.
* mat1 and offset1 come from @child.
*/
graphene_matrix_transform_vec4 (mat1, offset2, &off2);
graphene_vec4_add (&off2, offset1, &off2);
graphene_matrix_multiply (mat1, &mat2, &mat2);
result = gsk_color_matrix_node_new (gsk_color_matrix_node_get_child (child),
&mat2, &off2);
return result;
}
static GskRenderNode *
gtk_snapshot_collect_color_matrix (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *result;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
if (gsk_render_node_get_node_type (node) == GSK_COLOR_MATRIX_NODE)
{
result = merge_color_matrix_nodes (&state->data.color_matrix.matrix,
&state->data.color_matrix.offset,
node);
gsk_render_node_unref (node);
}
else if (gsk_render_node_get_node_type (node) == GSK_TRANSFORM_NODE)
{
GskRenderNode *transform_child = gsk_transform_node_get_child (node);
GskRenderNode *color_matrix;
if (gsk_render_node_get_node_type (transform_child) == GSK_COLOR_MATRIX_NODE)
{
color_matrix = merge_color_matrix_nodes (&state->data.color_matrix.matrix,
&state->data.color_matrix.offset,
transform_child);
}
else
{
color_matrix = gsk_color_matrix_node_new (transform_child,
&state->data.color_matrix.matrix,
&state->data.color_matrix.offset);
}
result = gsk_transform_node_new (color_matrix,
gsk_transform_node_get_transform (node));
gsk_render_node_unref (color_matrix);
gsk_render_node_unref (node);
node = NULL;
}
else
{
result = gsk_color_matrix_node_new (node,
&state->data.color_matrix.matrix,
&state->data.color_matrix.offset);
gsk_render_node_unref (node);
}
return result;
}
/**
* gtk_snapshot_push_color_matrix:
* @snapshot: a #GtkSnapshot
* @color_matrix: the color matrix to use
* @color_offset: the color offset to use
*
* Modifies the colors of an image by applying an affine transformation
* in RGB space.
*
* The image is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_color_matrix (GtkSnapshot *snapshot,
const graphene_matrix_t *color_matrix,
const graphene_vec4_t *color_offset)
{
const GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *state;
state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_color_matrix);
graphene_matrix_init_from_matrix (&state->data.color_matrix.matrix, color_matrix);
graphene_vec4_init_from_vec4 (&state->data.color_matrix.offset, color_offset);
}
static GskRenderNode *
gtk_snapshot_collect_repeat (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *repeat_node;
graphene_rect_t *bounds = &state->data.repeat.bounds;
graphene_rect_t *child_bounds = &state->data.repeat.child_bounds;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
repeat_node = gsk_repeat_node_new (bounds,
node,
child_bounds->size.width > 0 ? child_bounds : NULL);
gsk_render_node_unref (node);
return repeat_node;
}
static void
gtk_graphene_rect_scale_affine (const graphene_rect_t *rect,
float scale_x,
float scale_y,
float dx,
float dy,
graphene_rect_t *res)
{
res->origin.x = scale_x * rect->origin.x + dx;
res->origin.y = scale_y * rect->origin.y + dy;
res->size.width = scale_x * rect->size.width;
res->size.height = scale_y * rect->size.height;
/* necessary when scale_x or scale_y are < 0 */
graphene_rect_normalize (res);
}
static void
gtk_rounded_rect_scale_affine (GskRoundedRect *dest,
const GskRoundedRect *src,
float scale_x,
float scale_y,
float dx,
float dy)
{
guint flip;
guint i;
g_assert (dest != src);
gtk_graphene_rect_scale_affine (&src->bounds, scale_x, scale_y, dx, dy, &dest->bounds);
flip = ((scale_x < 0) ? 1 : 0) + (scale_y < 0 ? 2 : 0);
for (i = 0; i < 4; i++)
{
dest->corner[i].width = src->corner[i ^ flip].width * fabsf (scale_x);
dest->corner[i].height = src->corner[i ^ flip].height * fabsf (scale_y);
}
}
static void
gtk_snapshot_ensure_affine (GtkSnapshot *snapshot,
float *scale_x,
float *scale_y,
float *dx,
float *dy)
{
const GtkSnapshotState *state = gtk_snapshot_get_current_state (snapshot);
if (gsk_transform_get_category (state->transform) < GSK_TRANSFORM_CATEGORY_2D_AFFINE)
{
gtk_snapshot_autopush_transform (snapshot);
state = gtk_snapshot_get_current_state (snapshot);
}
gsk_transform_to_affine (state->transform, scale_x, scale_y, dx, dy);
}
static void
gtk_snapshot_ensure_translate (GtkSnapshot *snapshot,
float *dx,
float *dy)
{
const GtkSnapshotState *state = gtk_snapshot_get_current_state (snapshot);
if (gsk_transform_get_category (state->transform) < GSK_TRANSFORM_CATEGORY_2D_TRANSLATE)
{
gtk_snapshot_autopush_transform (snapshot);
state = gtk_snapshot_get_current_state (snapshot);
}
gsk_transform_to_translate (state->transform, dx, dy);
}
static void
gtk_snapshot_ensure_identity (GtkSnapshot *snapshot)
{
const GtkSnapshotState *state = gtk_snapshot_get_current_state (snapshot);
if (gsk_transform_get_category (state->transform) < GSK_TRANSFORM_CATEGORY_IDENTITY)
gtk_snapshot_autopush_transform (snapshot);
}
/**
* gtk_snapshot_push_repeat:
* @snapshot: a #GtkSnapshot
* @bounds: the bounds within which to repeat
* @child_bounds: (nullable): the bounds of the child or %NULL
* to use the full size of the collected child node
*
* Creates a node that repeats the child node.
*
* The child is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_repeat (GtkSnapshot *snapshot,
const graphene_rect_t *bounds,
const graphene_rect_t *child_bounds)
{
GtkSnapshotState *state;
graphene_rect_t real_child_bounds = { { 0 } };
float scale_x, scale_y, dx, dy;
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
if (child_bounds)
gtk_graphene_rect_scale_affine (child_bounds, scale_x, scale_y, dx, dy, &real_child_bounds);
state = gtk_snapshot_push_state (snapshot,
gtk_snapshot_get_current_state (snapshot)->transform,
gtk_snapshot_collect_repeat);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &state->data.repeat.bounds);
state->data.repeat.child_bounds = real_child_bounds;
}
static GskRenderNode *
gtk_snapshot_collect_clip (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *clip_node;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
/* Check if the child node will even be clipped */
if (graphene_rect_contains_rect (&state->data.clip.bounds, &node->bounds))
return node;
if (state->data.clip.bounds.size.width == 0 ||
state->data.clip.bounds.size.height == 0)
return NULL;
clip_node = gsk_clip_node_new (node, &state->data.clip.bounds);
gsk_render_node_unref (node);
return clip_node;
}
/**
* gtk_snapshot_push_clip:
* @snapshot: a #GtkSnapshot
* @bounds: the rectangle to clip to
*
* Clips an image to a rectangle.
*
* The image is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_clip (GtkSnapshot *snapshot,
const graphene_rect_t *bounds)
{
GtkSnapshotState *state;
float scale_x, scale_y, dx, dy;
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
state = gtk_snapshot_push_state (snapshot,
gtk_snapshot_get_current_state (snapshot)->transform,
gtk_snapshot_collect_clip);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &state->data.clip.bounds);
}
static GskRenderNode *
gtk_snapshot_collect_rounded_clip (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *clip_node;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
/* If the given radius is 0 in all corners, we can just create a normal clip node */
if (gsk_rounded_rect_is_rectilinear (&state->data.rounded_clip.bounds))
{
/* ... and do the same optimization */
if (graphene_rect_contains_rect (&state->data.rounded_clip.bounds.bounds, &node->bounds))
return node;
clip_node = gsk_clip_node_new (node, &state->data.rounded_clip.bounds.bounds);
}
else
{
if (gsk_rounded_rect_contains_rect (&state->data.rounded_clip.bounds, &node->bounds))
return node;
clip_node = gsk_rounded_clip_node_new (node, &state->data.rounded_clip.bounds);
}
if (clip_node->bounds.size.width == 0 ||
clip_node->bounds.size.height == 0)
{
gsk_render_node_unref (node);
gsk_render_node_unref (clip_node);
return NULL;
}
gsk_render_node_unref (node);
return clip_node;
}
/**
* gtk_snapshot_push_rounded_clip:
* @snapshot: a #GtkSnapshot
* @bounds: the rounded rectangle to clip to
*
* Clips an image to a rounded rectangle.
*
* The image is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_rounded_clip (GtkSnapshot *snapshot,
const GskRoundedRect *bounds)
{
GtkSnapshotState *state;
float scale_x, scale_y, dx, dy;
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
state = gtk_snapshot_push_state (snapshot,
gtk_snapshot_get_current_state (snapshot)->transform,
gtk_snapshot_collect_rounded_clip);
gtk_rounded_rect_scale_affine (&state->data.rounded_clip.bounds, bounds, scale_x, scale_y, dx, dy);
}
static GskRenderNode *
gtk_snapshot_collect_shadow (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *node, *shadow_node;
node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
if (node == NULL)
return NULL;
shadow_node = gsk_shadow_node_new (node,
state->data.shadow.shadows != NULL ?
state->data.shadow.shadows :
&state->data.shadow.a_shadow,
state->data.shadow.n_shadows);
gsk_render_node_unref (node);
g_free (state->data.shadow.shadows);
return shadow_node;
}
/**
* gtk_snapshot_push_shadow:
* @snapshot: a #GtkSnapshot
* @shadow: the first shadow specification
* @n_shadows: number of shadow specifications
*
* Applies a shadow to an image.
*
* The image is recorded until the next call to gtk_snapshot_pop().
*/
void
gtk_snapshot_push_shadow (GtkSnapshot *snapshot,
const GskShadow *shadow,
gsize n_shadows)
{
const GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *state;
state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_shadow);
state->data.shadow.n_shadows = n_shadows;
if (n_shadows == 1)
{
state->data.shadow.shadows = NULL;
memcpy (&state->data.shadow.a_shadow, shadow, sizeof (GskShadow));
}
else
{
state->data.shadow.shadows = g_malloc (sizeof (GskShadow) * n_shadows);
memcpy (state->data.shadow.shadows, shadow, sizeof (GskShadow) * n_shadows);
}
}
static GskRenderNode *
gtk_snapshot_collect_blend_top (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *bottom_node, *top_node, *blend_node;
GdkRGBA transparent = { 0, 0, 0, 0 };
top_node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
bottom_node = state->data.blend.bottom_node;
g_assert (top_node != NULL || bottom_node != NULL);
/* XXX: Is this necessary? Do we need a NULL node? */
if (top_node == NULL)
top_node = gsk_color_node_new (&transparent, &bottom_node->bounds);
if (bottom_node == NULL)
bottom_node = gsk_color_node_new (&transparent, &top_node->bounds);
blend_node = gsk_blend_node_new (bottom_node, top_node, state->data.blend.blend_mode);
gsk_render_node_unref (top_node);
gsk_render_node_unref (bottom_node);
return blend_node;
}
static GskRenderNode *
gtk_snapshot_collect_blend_bottom (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GtkSnapshotState *prev_state = gtk_snapshot_get_previous_state (snapshot);
g_assert (prev_state->collect_func == gtk_snapshot_collect_blend_top);
prev_state->data.blend.bottom_node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
return NULL;
}
/**
* gtk_snapshot_push_blend:
* @snapshot: a #GtkSnapshot
* @blend_mode: blend mode to use
*
* Blends together 2 images with the given blend mode.
*
* Until the first call to gtk_snapshot_pop(), the bottom image for the
* blend operation will be recorded. After that call, the top image to
* be blended will be recorded until the second call to gtk_snapshot_pop().
*
* Calling this function requires 2 subsequent calls to gtk_snapshot_pop().
**/
void
gtk_snapshot_push_blend (GtkSnapshot *snapshot,
GskBlendMode blend_mode)
{
GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *top_state;
top_state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_blend_top);
top_state->data.blend.blend_mode = blend_mode;
gtk_snapshot_push_state (snapshot,
top_state->transform,
gtk_snapshot_collect_blend_bottom);
}
static GskRenderNode *
gtk_snapshot_collect_cross_fade_end (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GskRenderNode *start_node, *end_node, *node;
end_node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
start_node = state->data.cross_fade.start_node;
if (state->data.cross_fade.progress <= 0.0)
{
node = start_node;
if (end_node)
gsk_render_node_unref (end_node);
}
else if (state->data.cross_fade.progress >= 1.0)
{
node = end_node;
if (start_node)
gsk_render_node_unref (start_node);
}
else if (start_node && end_node)
{
node = gsk_cross_fade_node_new (start_node, end_node, state->data.cross_fade.progress);
gsk_render_node_unref (start_node);
gsk_render_node_unref (end_node);
}
else if (start_node)
{
node = gsk_opacity_node_new (start_node, 1.0 - state->data.cross_fade.progress);
gsk_render_node_unref (start_node);
}
else if (end_node)
{
node = gsk_opacity_node_new (end_node, state->data.cross_fade.progress);
gsk_render_node_unref (end_node);
}
else
{
node = NULL;
}
return node;
}
static GskRenderNode *
gtk_snapshot_collect_cross_fade_start (GtkSnapshot *snapshot,
GtkSnapshotState *state,
GskRenderNode **nodes,
guint n_nodes)
{
GtkSnapshotState *prev_state = gtk_snapshot_get_previous_state (snapshot);
g_assert (prev_state->collect_func == gtk_snapshot_collect_cross_fade_end);
prev_state->data.cross_fade.start_node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
return NULL;
}
/**
* gtk_snapshot_push_cross_fade:
* @snapshot: a #GtkSnapshot
* @progress: progress between 0.0 and 1.0
*
* Snapshots a cross-fade operation between two images with the
* given @progress.
*
* Until the first call to gtk_snapshot_pop(), the start image
* will be snapshot. After that call, the end image will be recorded
* until the second call to gtk_snapshot_pop().
*
* Calling this function requires 2 calls to gtk_snapshot_pop().
**/
void
gtk_snapshot_push_cross_fade (GtkSnapshot *snapshot,
double progress)
{
const GtkSnapshotState *current_state = gtk_snapshot_get_current_state (snapshot);
GtkSnapshotState *end_state;
end_state = gtk_snapshot_push_state (snapshot,
current_state->transform,
gtk_snapshot_collect_cross_fade_end);
end_state->data.cross_fade.progress = progress;
gtk_snapshot_push_state (snapshot,
end_state->transform,
gtk_snapshot_collect_cross_fade_start);
}
static GskRenderNode *
gtk_snapshot_pop_one (GtkSnapshot *snapshot)
{
GtkSnapshotState *state;
guint state_index;
GskRenderNode *node;
if (snapshot->state_stack->len == 0 &&
!snapshot->from_parent)
{
g_warning ("Too many gtk_snapshot_pop() calls.");
return NULL;
}
state = gtk_snapshot_get_current_state (snapshot);
state_index = snapshot->state_stack->len - 1;
if (state->collect_func)
{
node = state->collect_func (snapshot,
state,
(GskRenderNode **) snapshot->nodes->pdata + state->start_node_index,
state->n_nodes);
/* The collect func may not modify the state stack... */
g_assert (state_index == snapshot->state_stack->len - 1);
/* Remove all the state's nodes from the list of nodes */
g_assert (state->start_node_index + state->n_nodes == snapshot->nodes->len);
g_ptr_array_remove_range (snapshot->nodes,
snapshot->nodes->len - state->n_nodes,
state->n_nodes);
}
else
{
GtkSnapshotState *previous_state;
node = NULL;
/* move the nodes to the parent */
previous_state = gtk_snapshot_get_previous_state (snapshot);
previous_state->n_nodes += state->n_nodes;
g_assert (previous_state->start_node_index + previous_state->n_nodes == snapshot->nodes->len);
}
g_array_remove_index (snapshot->state_stack, state_index);
return node;
}
static void
gtk_snapshot_append_node_internal (GtkSnapshot *snapshot,
GskRenderNode *node)
{
GtkSnapshotState *current_state;
current_state = gtk_snapshot_get_current_state (snapshot);
if (current_state)
{
g_ptr_array_add (snapshot->nodes, node);
current_state->n_nodes ++;
}
else
{
g_critical ("Tried appending a node to an already finished snapshot.");
}
}
static GskRenderNode *
gtk_snapshot_pop_internal (GtkSnapshot *snapshot)
{
GtkSnapshotState *state;
GskRenderNode *node;
guint forgotten_restores = 0;
for (state = gtk_snapshot_get_current_state (snapshot);
gtk_snapshot_state_should_autopop (state) ||
state->collect_func == NULL;
state = gtk_snapshot_get_current_state (snapshot))
{
if (state->collect_func == NULL)
forgotten_restores++;
node = gtk_snapshot_pop_one (snapshot);
if (node)
gtk_snapshot_append_node_internal (snapshot, node);
}
if (forgotten_restores)
{
g_warning ("Too many gtk_snapshot_save() calls. %u saves remaining.", forgotten_restores);
}
return gtk_snapshot_pop_one (snapshot);
}
/**
* gtk_snapshot_to_node:
* @snapshot: a #GtkSnapshot
*
* Returns the render node that was constructed
* by @snapshot. After calling this function, it
* is no longer possible to add more nodes to
* @snapshot. The only function that should be
* called after this is gtk_snapshot_unref().
*
* Returns: the constructed #GskRenderNode
*/
GskRenderNode *
gtk_snapshot_to_node (GtkSnapshot *snapshot)
{
GskRenderNode *result;
result = gtk_snapshot_pop_internal (snapshot);
/* We should have exactly our initial state */
if (snapshot->state_stack->len > 0 &&
!snapshot->from_parent)
{
g_warning ("Too many gtk_snapshot_push() calls. %u states remaining.", snapshot->state_stack->len);
}
if (!snapshot->from_parent)
{
g_array_free (snapshot->state_stack, TRUE);
g_ptr_array_free (snapshot->nodes, TRUE);
}
snapshot->state_stack = NULL;
snapshot->nodes = NULL;
return result;
}
/**
* gtk_snapshot_to_paintable:
* @snapshot: a #GtkSnapshot
* @size: (allow-none): The size of the resulting paintable
* or %NULL to use the bounds of the snapshot
*
* Returns a paintable encapsulating the render node
* that was constructed by @snapshot. After calling
* this function, it is no longer possible to add more
* nodes to @snapshot. The only function that should be
* called after this is gtk_snapshot_unref().
*
* Returns: (transfer full): a new #GdkPaintable
*/
GdkPaintable *
gtk_snapshot_to_paintable (GtkSnapshot *snapshot,
const graphene_size_t *size)
{
GskRenderNode *node;
GdkPaintable *paintable;
graphene_rect_t bounds;
node = gtk_snapshot_to_node (snapshot);
if (size)
{
graphene_size_init_from_size (&bounds.size, size);
}
else
{
gsk_render_node_get_bounds (node, &bounds);
bounds.size.width += bounds.origin.x;
bounds.size.height += bounds.origin.y;
}
bounds.origin.x = 0;
bounds.origin.y = 0;
paintable = gtk_render_node_paintable_new (node, &bounds);
gsk_render_node_unref (node);
return paintable;
}
/**
* gtk_snapshot_pop:
* @snapshot: a #GtkSnapshot
*
* Removes the top element from the stack of render nodes,
* and appends it to the node underneath it.
*/
void
gtk_snapshot_pop (GtkSnapshot *snapshot)
{
GskRenderNode *node;
node = gtk_snapshot_pop_internal (snapshot);
if (node)
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_save:
* @snapshot: a #GtkSnapshot
*
* Makes a copy of the current state of @snapshot and saves it
* on an internal stack of saved states for @snapshot. When
* gtk_snapshot_restore() is called, @snapshot will be restored to
* the saved state. Multiple calls to gtk_snapshot_save() and
* gtk_snapshot_restore() can be nested; each call to
* gtk_snapshot_restore() restores the state from the matching paired
* gtk_snapshot_save().
*
* It is necessary to clear all saved states with corresponding calls
* to gtk_snapshot_restore().
**/
void
gtk_snapshot_save (GtkSnapshot *snapshot)
{
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
gtk_snapshot_push_state (snapshot,
gtk_snapshot_get_current_state (snapshot)->transform,
NULL);
}
/**
* gtk_snapshot_restore:
* @snapshot: a #GtkSnapshot
*
* Restores @snapshot to the state saved by a preceding call to
* gtk_snapshot_save() and removes that state from the stack of
* saved states.
**/
void
gtk_snapshot_restore (GtkSnapshot *snapshot)
{
GtkSnapshotState *state;
GskRenderNode *node;
for (state = gtk_snapshot_get_current_state (snapshot);
gtk_snapshot_state_should_autopop (state);
state = gtk_snapshot_get_current_state (snapshot))
{
node = gtk_snapshot_pop_one (snapshot);
if (node)
gtk_snapshot_append_node_internal (snapshot, node);
}
if (state->collect_func != NULL)
{
g_warning ("Too many gtk_snapshot_restore() calls.");
return;
}
node = gtk_snapshot_pop_one (snapshot);
g_assert (node == NULL);
}
/**
* gtk_snapshot_transform:
* @snapshot: a #GtkSnapshot
* @transform: (allow-none): the transform to apply
*
* Transforms @snapshot's coordinate system with the given @transform.
**/
void
gtk_snapshot_transform (GtkSnapshot *snapshot,
GskTransform *transform)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_transform (state->transform, transform);
}
/**
* gtk_snapshot_transform_matrix:
* @snapshot: a #GtkSnapshot
* @matrix: the matrix to multiply the transform with
*
* Transforms @snapshot's coordinate system with the given @matrix.
**/
void
gtk_snapshot_transform_matrix (GtkSnapshot *snapshot,
const graphene_matrix_t *matrix)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
g_return_if_fail (matrix != NULL);
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_matrix (state->transform, matrix);
}
/**
* gtk_snapshot_translate:
* @snapshot: a #GtkSnapshot
* @point: the point to translate the snapshot by
*
* Translates @snapshot's coordinate system by @point in 2-dimensional space.
*/
void
gtk_snapshot_translate (GtkSnapshot *snapshot,
const graphene_point_t *point)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
g_return_if_fail (point != NULL);
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_translate (state->transform, point);
}
/**
* gtk_snapshot_translate_3d:
* @snapshot: a #GtkSnapshot
* @point: the point to translate the snapshot by
*
* Translates @snapshot's coordinate system by @point.
*/
void
gtk_snapshot_translate_3d (GtkSnapshot *snapshot,
const graphene_point3d_t *point)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
g_return_if_fail (point != NULL);
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_translate_3d (state->transform, point);
}
/**
* gtk_snapshot_rotate:
* @snapshot: a #GtkSnapshot
* @angle: the rotation angle, in degrees (clockwise)
*
* Rotates @@snapshot's coordinate system by @angle degrees in 2D space -
* or in 3D speak, rotates around the z axis.
*/
void
gtk_snapshot_rotate (GtkSnapshot *snapshot,
float angle)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_rotate (state->transform, angle);
}
/**
* gtk_snapshot_rotate_3d:
* @snapshot: a #GtkSnapshot
* @angle: the rotation angle, in degrees (clockwise)
* @axis: The rotation axis
*
* Rotates @snapshot's coordinate system by @angle degrees around @axis.
*
* For a rotation in 2D space, use gsk_transform_rotate().
*/
void
gtk_snapshot_rotate_3d (GtkSnapshot *snapshot,
float angle,
const graphene_vec3_t *axis)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
g_return_if_fail (axis != NULL);
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_rotate_3d (state->transform, angle, axis);
}
/**
* gtk_snapshot_scale:
* @snapshot: a #GtkSnapshot
* @factor_x: scaling factor on the X axis
* @factor_y: scaling factor on the Y axis
*
* Scales @snapshot's coordinate system in 2-dimensional space by
* the given factors.
*
* Use gtk_snapshot_scale_3d() to scale in all 3 dimensions.
**/
void
gtk_snapshot_scale (GtkSnapshot *snapshot,
float factor_x,
float factor_y)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_scale (state->transform, factor_x, factor_y);
}
/**
* gtk_snapshot_scale_3d:
* @snapshot: a #GtkSnapshot
* @factor_x: scaling factor on the X axis
* @factor_y: scaling factor on the Y axis
* @factor_z: scaling factor on the Z axis
*
* Scales @snapshot's coordinate system by the given factors.
*/
void
gtk_snapshot_scale_3d (GtkSnapshot *snapshot,
float factor_x,
float factor_y,
float factor_z)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_scale_3d (state->transform, factor_x, factor_y, factor_z);
}
/**
* gtk_snapshot_perspective:
* @snapshot: a #GtkSnapshot
* @depth: distance of the z=0 plane
*
* Applies a perspective projection transform.
*
* See gsk_transform_perspective() for a discussion on the details.
*/
void
gtk_snapshot_perspective (GtkSnapshot *snapshot,
float depth)
{
GtkSnapshotState *state;
g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
state = gtk_snapshot_get_current_state (snapshot);
state->transform = gsk_transform_perspective (state->transform, depth);
}
/**
* gtk_snapshot_append_node:
* @snapshot: a #GtkSnapshot
* @node: a #GskRenderNode
*
* Appends @node to the current render node of @snapshot,
* without changing the current node. If @snapshot does
* not have a current node yet, @node will become the
* initial node.
*/
void
gtk_snapshot_append_node (GtkSnapshot *snapshot,
GskRenderNode *node)
{
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GSK_IS_RENDER_NODE (node));
gtk_snapshot_ensure_identity (snapshot);
gtk_snapshot_append_node_internal (snapshot, gsk_render_node_ref (node));
}
/**
* gtk_snapshot_append_cairo:
* @snapshot: a #GtkSnapshot
* @bounds: the bounds for the new node
*
* Creates a new render node and appends it to the current render
* node of @snapshot, without changing the current node.
*
* Returns: a cairo_t suitable for drawing the contents of the newly
* created render node
*/
cairo_t *
gtk_snapshot_append_cairo (GtkSnapshot *snapshot,
const graphene_rect_t *bounds)
{
GskRenderNode *node;
graphene_rect_t real_bounds;
float scale_x, scale_y, dx, dy;
cairo_t *cr;
g_return_val_if_fail (snapshot != NULL, NULL);
g_return_val_if_fail (bounds != NULL, NULL);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &real_bounds);
node = gsk_cairo_node_new (&real_bounds);
gtk_snapshot_append_node_internal (snapshot, node);
cr = gsk_cairo_node_get_draw_context (node);
cairo_scale (cr, scale_x, scale_y);
cairo_translate (cr, dx, dy);
return cr;
}
/**
* gtk_snapshot_append_texture:
* @snapshot: a #GtkSnapshot
* @texture: the #GdkTexture to render
* @bounds: the bounds for the new node
*
* Creates a new render node drawing the @texture into the given @bounds and appends it
* to the current render node of @snapshot.
**/
void
gtk_snapshot_append_texture (GtkSnapshot *snapshot,
GdkTexture *texture,
const graphene_rect_t *bounds)
{
GskRenderNode *node;
graphene_rect_t real_bounds;
float scale_x, scale_y, dx, dy;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GDK_IS_TEXTURE (texture));
g_return_if_fail (bounds != NULL);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &real_bounds);
node = gsk_texture_node_new (texture, &real_bounds);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_color:
* @snapshot: a #GtkSnapshot
* @color: the #GdkRGBA to draw
* @bounds: the bounds for the new node
*
* Creates a new render node drawing the @color into the given @bounds and appends it
* to the current render node of @snapshot.
*
* You should try to avoid calling this function if @color is transparent.
**/
void
gtk_snapshot_append_color (GtkSnapshot *snapshot,
const GdkRGBA *color,
const graphene_rect_t *bounds)
{
GskRenderNode *node;
graphene_rect_t real_bounds;
float scale_x, scale_y, dx, dy;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (color != NULL);
g_return_if_fail (bounds != NULL);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &real_bounds);
node = gsk_color_node_new (color, &real_bounds);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_render_background:
* @snapshot: a #GtkSnapshot
* @context: the #GtkStyleContext to use
* @x: X origin of the rectangle
* @y: Y origin of the rectangle
* @width: rectangle width
* @height: rectangle height
*
* Creates a render node for the CSS background according to @context,
* and appends it to the current node of @snapshot, without changing
* the current node.
*/
void
gtk_snapshot_render_background (GtkSnapshot *snapshot,
GtkStyleContext *context,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
GtkCssBoxes boxes;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_boxes_init_border_box (&boxes,
gtk_style_context_lookup_style (context),
x, y, width, height);
gtk_css_style_snapshot_background (&boxes, snapshot);
}
/**
* gtk_snapshot_render_frame:
* @snapshot: a #GtkSnapshot
* @context: the #GtkStyleContext to use
* @x: X origin of the rectangle
* @y: Y origin of the rectangle
* @width: rectangle width
* @height: rectangle height
*
* Creates a render node for the CSS border according to @context,
* and appends it to the current node of @snapshot, without changing
* the current node.
*/
void
gtk_snapshot_render_frame (GtkSnapshot *snapshot,
GtkStyleContext *context,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
GtkCssBoxes boxes;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_boxes_init_border_box (&boxes,
gtk_style_context_lookup_style (context),
x, y, width, height);
gtk_css_style_snapshot_border (&boxes, snapshot);
}
/**
* gtk_snapshot_render_focus:
* @snapshot: a #GtkSnapshot
* @context: the #GtkStyleContext to use
* @x: X origin of the rectangle
* @y: Y origin of the rectangle
* @width: rectangle width
* @height: rectangle height
*
* Creates a render node for the focus outline according to @context,
* and appends it to the current node of @snapshot, without changing
* the current node.
*/
void
gtk_snapshot_render_focus (GtkSnapshot *snapshot,
GtkStyleContext *context,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
GtkCssBoxes boxes;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_boxes_init_border_box (&boxes,
gtk_style_context_lookup_style (context),
x, y, width, height);
gtk_css_style_snapshot_outline (&boxes, snapshot);
}
/**
* gtk_snapshot_render_layout:
* @snapshot: a #GtkSnapshot
* @context: the #GtkStyleContext to use
* @x: X origin of the rectangle
* @y: Y origin of the rectangle
* @layout: the #PangoLayout to render
*
* Creates a render node for rendering @layout according to the style
* information in @context, and appends it to the current node of @snapshot,
* without changing the current node.
*/
void
gtk_snapshot_render_layout (GtkSnapshot *snapshot,
GtkStyleContext *context,
gdouble x,
gdouble y,
PangoLayout *layout)
{
const GdkRGBA *fg_color;
GtkCssValue *shadows_value;
gboolean has_shadow;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (PANGO_IS_LAYOUT (layout));
gtk_snapshot_save (snapshot);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
fg_color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));
shadows_value = _gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_SHADOW);
has_shadow = gtk_css_shadows_value_push_snapshot (shadows_value, snapshot);
gtk_snapshot_append_layout (snapshot, layout, fg_color);
if (has_shadow)
gtk_snapshot_pop (snapshot);
gtk_snapshot_restore (snapshot);
}
void
gtk_snapshot_append_text (GtkSnapshot *snapshot,
PangoFont *font,
PangoGlyphString *glyphs,
const GdkRGBA *color,
float x,
float y)
{
GskRenderNode *node;
float dx, dy;
gtk_snapshot_ensure_translate (snapshot, &dx, &dy);
node = gsk_text_node_new (font,
glyphs,
color,
&GRAPHENE_POINT_INIT (x + dx, y + dy));
if (node == NULL)
return;
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_linear_gradient:
* @snapshot: a #GtkSnapshot
* @bounds: the rectangle to render the linear gradient into
* @start_point: the point at which the linear gradient will begin
* @end_point: the point at which the linear gradient will finish
* @stops: (array length=n_stops): a pointer to an array of #GskColorStop defining the gradient
* @n_stops: the number of elements in @stops
*
* Appends a linear gradient node with the given stops to @snapshot.
*/
void
gtk_snapshot_append_linear_gradient (GtkSnapshot *snapshot,
const graphene_rect_t *bounds,
const graphene_point_t *start_point,
const graphene_point_t *end_point,
const GskColorStop *stops,
gsize n_stops)
{
GskRenderNode *node;
graphene_rect_t real_bounds;
graphene_point_t real_start_point;
graphene_point_t real_end_point;
float scale_x, scale_y, dx, dy;
const GdkRGBA *first_color;
gboolean need_gradient = FALSE;
int i;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (start_point != NULL);
g_return_if_fail (end_point != NULL);
g_return_if_fail (stops != NULL);
g_return_if_fail (n_stops > 1);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &real_bounds);
real_start_point.x = scale_x * start_point->x + dx;
real_start_point.y = scale_y * start_point->y + dy;
real_end_point.x = scale_x * end_point->x + dx;
real_end_point.y = scale_y * end_point->y + dy;
first_color = &stops[0].color;
for (i = 0; i < n_stops; i ++)
{
if (!gdk_rgba_equal (first_color, &stops[i].color))
{
need_gradient = TRUE;
break;
}
}
if (need_gradient)
node = gsk_linear_gradient_node_new (&real_bounds,
&real_start_point,
&real_end_point,
stops,
n_stops);
else
node = gsk_color_node_new (first_color, &real_bounds);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_repeating_linear_gradient:
* @snapshot: a #GtkSnapshot
* @bounds: the rectangle to render the linear gradient into
* @start_point: the point at which the linear gradient will begin
* @end_point: the point at which the linear gradient will finish
* @stops: (array length=n_stops): a pointer to an array of #GskColorStop defining the gradient
* @n_stops: the number of elements in @stops
*
* Appends a repeating linear gradient node with the given stops to @snapshot.
*/
void
gtk_snapshot_append_repeating_linear_gradient (GtkSnapshot *snapshot,
const graphene_rect_t *bounds,
const graphene_point_t *start_point,
const graphene_point_t *end_point,
const GskColorStop *stops,
gsize n_stops)
{
GskRenderNode *node;
graphene_rect_t real_bounds;
graphene_point_t real_start_point;
graphene_point_t real_end_point;
float scale_x, scale_y, dx, dy;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (start_point != NULL);
g_return_if_fail (end_point != NULL);
g_return_if_fail (stops != NULL);
g_return_if_fail (n_stops > 1);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
gtk_graphene_rect_scale_affine (bounds, scale_x, scale_y, dx, dy, &real_bounds);
real_start_point.x = scale_x * start_point->x + dx;
real_start_point.y = scale_y * start_point->y + dy;
real_end_point.x = scale_x * end_point->x + dx;
real_end_point.y = scale_y * end_point->y + dy;
node = gsk_repeating_linear_gradient_node_new (&real_bounds,
&real_start_point,
&real_end_point,
stops,
n_stops);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_border:
* @snapshot: a #GtkSnapshot
* @outline: a #GskRoundedRect describing the outline of the border
* @border_width: (array fixed-size=4): the stroke width of the border on
* the top, right, bottom and left side respectively.
* @border_color: (array fixed-size=4): the color used on the top, right,
* bottom and left side.
*
* Appends a stroked border rectangle inside the given @outline. The
* 4 sides of the border can have different widths and colors.
**/
void
gtk_snapshot_append_border (GtkSnapshot *snapshot,
const GskRoundedRect *outline,
const float border_width[4],
const GdkRGBA border_color[4])
{
GskRenderNode *node;
GskRoundedRect real_outline;
float scale_x, scale_y, dx, dy;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (outline != NULL);
g_return_if_fail (border_width != NULL);
g_return_if_fail (border_color != NULL);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &dx, &dy);
gtk_rounded_rect_scale_affine (&real_outline, outline, scale_x, scale_y, dx, dy);
node = gsk_border_node_new (&real_outline, border_width, border_color);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_inset_shadow:
* @snapshot: a #GtkSnapshot
* @outline: outline of the region surrounded by shadow
* @color: color of the shadow
* @dx: horizontal offset of shadow
* @dy: vertical offset of shadow
* @spread: how far the shadow spreads towards the inside
* @blur_radius: how much blur to apply to the shadow
*
* Appends an inset shadow into the box given by @outline.
*/
void
gtk_snapshot_append_inset_shadow (GtkSnapshot *snapshot,
const GskRoundedRect *outline,
const GdkRGBA *color,
float dx,
float dy,
float spread,
float blur_radius)
{
GskRenderNode *node;
GskRoundedRect real_outline;
float scale_x, scale_y, x, y;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (outline != NULL);
g_return_if_fail (color != NULL);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &x, &y);
gtk_rounded_rect_scale_affine (&real_outline, outline, scale_x, scale_y, x, y);
node = gsk_inset_shadow_node_new (&real_outline,
color,
scale_x * dx,
scale_y * dy,
spread,
blur_radius);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_outset_shadow:
* @snapshot: a #GtkSnapshot
* @outline: outline of the region surrounded by shadow
* @color: color of the shadow
* @dx: horizontal offset of shadow
* @dy: vertical offset of shadow
* @spread: how far the shadow spreads towards the outside
* @blur_radius: how much blur to apply to the shadow
*
* Appends an outset shadow node around the box given by @outline.
*/
void
gtk_snapshot_append_outset_shadow (GtkSnapshot *snapshot,
const GskRoundedRect *outline,
const GdkRGBA *color,
float dx,
float dy,
float spread,
float blur_radius)
{
GskRenderNode *node;
GskRoundedRect real_outline;
float scale_x, scale_y, x, y;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (outline != NULL);
g_return_if_fail (color != NULL);
gtk_snapshot_ensure_affine (snapshot, &scale_x, &scale_y, &x, &y);
gtk_rounded_rect_scale_affine (&real_outline, outline, scale_x, scale_y, x, y);
node = gsk_outset_shadow_node_new (&real_outline,
color,
scale_x * dx,
scale_y * dy,
spread,
blur_radius);
gtk_snapshot_append_node_internal (snapshot, node);
}
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