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Learning_GTK4_tree/gtk/gskpango.c

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/*
* Copyright (C) 2017 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gsk/gsk.h"
#include "gsk/gskrendernodeprivate.h"
#include "gskpangoprivate.h"
#include "gtksnapshotprivate.h"
#include "gtktextlayoutprivate.h"
#include "gtktextviewprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include <math.h>
#include <pango/pango.h>
#include <cairo.h>
G_DEFINE_TYPE (GskPangoRenderer, gsk_pango_renderer, PANGO_TYPE_RENDERER)
void
gsk_pango_renderer_set_state (GskPangoRenderer *crenderer,
GskPangoRendererState state)
{
g_return_if_fail (GSK_IS_PANGO_RENDERER (crenderer));
crenderer->state = state;
}
void
gsk_pango_renderer_set_shape_handler (GskPangoRenderer *crenderer,
GskPangoShapeHandler handler)
{
g_return_if_fail (GSK_IS_PANGO_RENDERER (crenderer));
crenderer->shape_handler = handler;
}
static void
get_color (GskPangoRenderer *crenderer,
PangoRenderPart part,
GdkRGBA *rgba)
{
const PangoColor *color = pango_renderer_get_color ((PangoRenderer *) (crenderer), part);
const guint16 a = pango_renderer_get_alpha ((PangoRenderer *) (crenderer), part);
if (color)
{
rgba->red = color->red / 65535.;
rgba->green = color->green / 65535.;
rgba->blue = color->blue / 65535.;
rgba->alpha = a ? a / 65535. : crenderer->fg_color->alpha;
}
else
{
*rgba = *crenderer->fg_color;
if (a)
rgba->alpha = a / 65535.;
}
}
static void
set_color (GskPangoRenderer *crenderer,
PangoRenderPart part,
cairo_t *cr)
{
GdkRGBA rgba = { 0, 0, 0, 1 };
get_color (crenderer, part, &rgba);
gdk_cairo_set_source_rgba (cr, &rgba);
}
static void
gsk_pango_renderer_draw_glyph_item (PangoRenderer *renderer,
const char *text,
PangoGlyphItem *glyph_item,
int x,
int y)
{
GskPangoRenderer *crenderer = (GskPangoRenderer *) (renderer);
GdkRGBA color;
get_color (crenderer, PANGO_RENDER_PART_FOREGROUND, &color);
gtk_snapshot_append_text (crenderer->snapshot,
glyph_item->item->analysis.font,
glyph_item->glyphs,
&color,
(float) x / PANGO_SCALE,
(float) y / PANGO_SCALE);
}
static void
gsk_pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
GskPangoRenderer *crenderer = (GskPangoRenderer *) (renderer);
GdkRGBA rgba;
get_color (crenderer, part, &rgba);
gtk_snapshot_append_color (crenderer->snapshot,
&rgba,
&GRAPHENE_RECT_INIT ((double)x / PANGO_SCALE,
(double)y / PANGO_SCALE,
(double)width / PANGO_SCALE,
(double)height / PANGO_SCALE));
}
static void
gsk_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1_,
double x11,
double x21,
double y2,
double x12,
double x22)
{
GskPangoRenderer *crenderer = (GskPangoRenderer *) (renderer);
PangoLayout *layout;
PangoRectangle ink_rect;
cairo_t *cr;
double x, y;
layout = pango_renderer_get_layout (renderer);
if (!layout)
return;
pango_layout_get_pixel_extents (layout, &ink_rect, NULL);
cr = gtk_snapshot_append_cairo (crenderer->snapshot,
&GRAPHENE_RECT_INIT (ink_rect.x, ink_rect.y,
ink_rect.width, ink_rect.height));
set_color (crenderer, part, cr);
x = y = 0;
cairo_user_to_device_distance (cr, &x, &y);
cairo_identity_matrix (cr);
cairo_translate (cr, x, y);
cairo_move_to (cr, x11, y1_);
cairo_line_to (cr, x21, y1_);
cairo_line_to (cr, x22, y2);
cairo_line_to (cr, x12, y2);
cairo_close_path (cr);
cairo_fill (cr);
cairo_destroy (cr);
}
static void
gsk_pango_renderer_draw_error_underline (PangoRenderer *renderer,
int x,
int y,
int width,
int height)
{
GskPangoRenderer *crenderer = (GskPangoRenderer *) (renderer);
double xx, yy, ww, hh;
GdkRGBA rgba;
GskRoundedRect dot;
xx = (double)x / PANGO_SCALE;
yy = (double)y / PANGO_SCALE;
ww = (double)width / PANGO_SCALE;
hh = (double)height / PANGO_SCALE;
get_color (crenderer, PANGO_RENDER_PART_UNDERLINE, &rgba);
gtk_snapshot_push_repeat (crenderer->snapshot,
&GRAPHENE_RECT_INIT (xx, yy, ww, hh),
NULL);
gsk_rounded_rect_init_from_rect (&dot,
&GRAPHENE_RECT_INIT (xx, yy, hh, hh),
hh / 2);
gtk_snapshot_push_rounded_clip (crenderer->snapshot, &dot);
gtk_snapshot_append_color (crenderer->snapshot, &rgba, &dot.bounds);
gtk_snapshot_pop (crenderer->snapshot);
gtk_snapshot_append_color (crenderer->snapshot,
&(GdkRGBA) { 0.f, 0.f, 0.f, 0.f },
&GRAPHENE_RECT_INIT (xx, yy, 1.5 * hh, hh));
gtk_snapshot_pop (crenderer->snapshot);
}
static void
gsk_pango_renderer_draw_shape (PangoRenderer *renderer,
PangoAttrShape *attr,
int x,
int y)
{
GskPangoRenderer *crenderer = (GskPangoRenderer *) (renderer);
PangoLayout *layout;
PangoCairoShapeRendererFunc shape_renderer;
gpointer shape_renderer_data;
double base_x = (double)x / PANGO_SCALE;
double base_y = (double)y / PANGO_SCALE;
gboolean handled = FALSE;
if (crenderer->shape_handler)
{
double shape_x = base_x;
double shape_y = (double) (y + attr->logical_rect.y) / PANGO_SCALE;
if (shape_x != 0 || shape_y != 0)
{
gtk_snapshot_save (crenderer->snapshot);
gtk_snapshot_translate (crenderer->snapshot, &GRAPHENE_POINT_INIT (shape_x, shape_y));
}
handled = crenderer->shape_handler (attr,
crenderer->snapshot,
(double)attr->logical_rect.width / PANGO_SCALE,
(double)attr->logical_rect.height / PANGO_SCALE);
if (shape_x != 0 || shape_y != 0)
gtk_snapshot_restore (crenderer->snapshot);
}
if (!handled)
{
cairo_t *cr;
PangoRectangle ink_rect;
layout = pango_renderer_get_layout (renderer);
if (!layout)
return;
pango_layout_get_pixel_extents (layout, &ink_rect, NULL);
cr = gtk_snapshot_append_cairo (crenderer->snapshot,
&GRAPHENE_RECT_INIT (ink_rect.x, ink_rect.y,
ink_rect.width, ink_rect.height));
shape_renderer = pango_cairo_context_get_shape_renderer (pango_layout_get_context (layout),
&shape_renderer_data);
if (!shape_renderer)
{
cairo_destroy (cr);
return;
}
set_color (crenderer, PANGO_RENDER_PART_FOREGROUND, cr);
cairo_move_to (cr, base_x, base_y);
shape_renderer (cr, attr, FALSE, shape_renderer_data);
cairo_destroy (cr);
}
}
static void
text_renderer_set_rgba (GskPangoRenderer *crenderer,
PangoRenderPart part,
const GdkRGBA *rgba)
{
PangoRenderer *renderer = PANGO_RENDERER (crenderer);
PangoColor color = { 0, };
guint16 alpha;
if (rgba)
{
color.red = (guint16)(rgba->red * 65535);
color.green = (guint16)(rgba->green * 65535);
color.blue = (guint16)(rgba->blue * 65535);
alpha = (guint16)(rgba->alpha * 65535);
pango_renderer_set_color (renderer, part, &color);
pango_renderer_set_alpha (renderer, part, alpha);
}
else
{
pango_renderer_set_color (renderer, part, NULL);
pango_renderer_set_alpha (renderer, part, 0);
}
}
static GtkTextAppearance *
get_item_appearance (PangoItem *item)
{
GSList *tmp_list = item->analysis.extra_attrs;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
if (attr->klass->type == gtk_text_attr_appearance_type)
return &((GtkTextAttrAppearance *)attr)->appearance;
tmp_list = tmp_list->next;
}
return NULL;
}
static void
gsk_pango_renderer_prepare_run (PangoRenderer *renderer,
PangoLayoutRun *run)
{
GskPangoRenderer *crenderer = GSK_PANGO_RENDERER (renderer);
const GdkRGBA *bg_rgba = NULL;
const GdkRGBA *fg_rgba = NULL;
GtkTextAppearance *appearance;
PANGO_RENDERER_CLASS (gsk_pango_renderer_parent_class)->prepare_run (renderer, run);
appearance = get_item_appearance (run->item);
if (appearance == NULL)
return;
if (appearance->draw_bg && crenderer->state == GSK_PANGO_RENDERER_NORMAL)
bg_rgba = appearance->bg_rgba;
else
bg_rgba = NULL;
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_BACKGROUND, bg_rgba);
if (crenderer->state == GSK_PANGO_RENDERER_SELECTED &&
GTK_IS_TEXT_VIEW (crenderer->widget))
{
GtkCssNode *node;
GtkCssValue *value;
node = gtk_text_view_get_selection_node ((GtkTextView *)crenderer->widget);
value = gtk_css_node_get_style (node)->core->color;
fg_rgba = gtk_css_color_value_get_rgba (value);
}
else if (crenderer->state == GSK_PANGO_RENDERER_CURSOR && gtk_widget_has_focus (crenderer->widget))
{
GtkCssNode *node;
GtkCssValue *value;
node = gtk_widget_get_css_node (crenderer->widget);
value = gtk_css_node_get_style (node)->background->background_color;
fg_rgba = gtk_css_color_value_get_rgba (value);
}
else
fg_rgba = appearance->fg_rgba;
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_FOREGROUND, fg_rgba);
if (appearance->strikethrough_rgba)
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_STRIKETHROUGH, appearance->strikethrough_rgba);
else
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_STRIKETHROUGH, fg_rgba);
if (appearance->underline_rgba)
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_UNDERLINE, appearance->underline_rgba);
else if (appearance->underline == PANGO_UNDERLINE_ERROR)
{
if (!crenderer->error_color)
{
static const GdkRGBA red = { 1, 0, 0, 1 };
crenderer->error_color = gdk_rgba_copy (&red);
}
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_UNDERLINE, crenderer->error_color);
}
else
text_renderer_set_rgba (crenderer, PANGO_RENDER_PART_UNDERLINE, fg_rgba);
}
static void
gsk_pango_renderer_init (GskPangoRenderer *renderer G_GNUC_UNUSED)
{
}
static void
gsk_pango_renderer_class_init (GskPangoRendererClass *klass)
{
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
renderer_class->draw_glyph_item = gsk_pango_renderer_draw_glyph_item;
renderer_class->draw_rectangle = gsk_pango_renderer_draw_rectangle;
renderer_class->draw_trapezoid = gsk_pango_renderer_draw_trapezoid;
renderer_class->draw_error_underline = gsk_pango_renderer_draw_error_underline;
renderer_class->draw_shape = gsk_pango_renderer_draw_shape;
renderer_class->prepare_run = gsk_pango_renderer_prepare_run;
}
static GskPangoRenderer *cached_renderer = NULL; /* MT-safe */
G_LOCK_DEFINE_STATIC (cached_renderer);
GskPangoRenderer *
gsk_pango_renderer_acquire (void)
{
GskPangoRenderer *renderer;
if (G_LIKELY (G_TRYLOCK (cached_renderer)))
{
if (G_UNLIKELY (!cached_renderer))
{
cached_renderer = g_object_new (GSK_TYPE_PANGO_RENDERER, NULL);
cached_renderer->is_cached_renderer = TRUE;
}
renderer = cached_renderer;
/* Reset to standard state */
renderer->state = GSK_PANGO_RENDERER_NORMAL;
renderer->shape_handler = NULL;
}
else
{
renderer = g_object_new (GSK_TYPE_PANGO_RENDERER, NULL);
}
return renderer;
}
void
gsk_pango_renderer_release (GskPangoRenderer *renderer)
{
if (G_LIKELY (renderer->is_cached_renderer))
{
renderer->widget = NULL;
renderer->snapshot = NULL;
if (renderer->error_color)
{
gdk_rgba_free (renderer->error_color);
renderer->error_color = NULL;
}
G_UNLOCK (cached_renderer);
}
else
g_object_unref (renderer);
}
/**
* gtk_snapshot_append_layout:
* @snapshot: a `GtkSnapshot`
* @layout: the `PangoLayout` to render
* @color: the foreground color to render the layout in
*
* Creates render nodes for rendering @layout in the given foregound @color
* and appends them to the current node of @snapshot without changing the
* current node. The current theme's foreground color for a widget can be
* obtained with [method@Gtk.Widget.get_color].
*
* Note that if the layout does not produce any visible output, then nodes
* may not be added to the @snapshot.
**/
void
gtk_snapshot_append_layout (GtkSnapshot *snapshot,
PangoLayout *layout,
const GdkRGBA *color)
{
GskPangoRenderer *crenderer;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (PANGO_IS_LAYOUT (layout));
crenderer = gsk_pango_renderer_acquire ();
crenderer->snapshot = snapshot;
crenderer->fg_color = color;
pango_renderer_draw_layout (PANGO_RENDERER (crenderer), layout, 0, 0);
gsk_pango_renderer_release (crenderer);
}
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