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/* Pango
* pango-renderer.h: Base class for rendering
*
* Copyright (C) 2004, 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.
*/
#ifndef __PANGO_RENDERER_H_
#define __PANGO_RENDERER_H_
#include <pango/pango-layout.h>
G_BEGIN_DECLS
#define PANGO_TYPE_RENDERER (pango_renderer_get_type())
#define PANGO_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_RENDERER, PangoRenderer))
#define PANGO_IS_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_RENDERER))
#define PANGO_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_RENDERER, PangoRendererClass))
#define PANGO_IS_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_RENDERER))
#define PANGO_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_RENDERER, PangoRendererClass))
typedef struct _PangoRenderer PangoRenderer;
typedef struct _PangoRendererClass PangoRendererClass;
typedef struct _PangoRendererPrivate PangoRendererPrivate;
/**
* PangoRenderPart:
* @PANGO_RENDER_PART_FOREGROUND: the text itself
* @PANGO_RENDER_PART_BACKGROUND: the area behind the text
* @PANGO_RENDER_PART_UNDERLINE: underlines
* @PANGO_RENDER_PART_STRIKETHROUGH: strikethrough lines
* @PANGO_RENDER_PART_OVERLINE: overlines
*
* #PangoRenderPart defines different items to render for such
* purposes as setting colors.
*
* Since: 1.8
**/
/* When extending, note N_RENDER_PARTS #define in pango-renderer.c */
typedef enum
{
PANGO_RENDER_PART_FOREGROUND,
PANGO_RENDER_PART_BACKGROUND,
PANGO_RENDER_PART_UNDERLINE,
PANGO_RENDER_PART_STRIKETHROUGH,
PANGO_RENDER_PART_OVERLINE
} PangoRenderPart;
/**
* PangoRenderer:
* @matrix: (nullable): the current transformation matrix for
* the Renderer; may be %NULL, which should be treated the
* same as the identity matrix.
*
* `PangoRenderer` is a base class for objects that can render text
* provided as `PangoGlyphString` or `PangoLayout`.
*
* By subclassing `PangoRenderer` and overriding operations such as
* @draw_glyphs and @draw_rectangle, renderers for particular font
* backends and destinations can be created.
*
* Since: 1.8
*/
struct _PangoRenderer
{
/*< private >*/
GObject parent_instance;
PangoUnderline underline;
gboolean strikethrough;
int active_count;
/*< public >*/
PangoMatrix *matrix; /* May be NULL */
/*< private >*/
PangoRendererPrivate *priv;
};
/**
* PangoRendererClass:
* @draw_glyphs: draws a #PangoGlyphString
* @draw_rectangle: draws a rectangle
* @draw_error_underline: draws a squiggly line that approximately
* covers the given rectangle in the style of an underline used to
* indicate a spelling error.
* @draw_shape: draw content for a glyph shaped with #PangoAttrShape.
* @x, @y are the coordinates of the left edge of the baseline,
* in user coordinates.
* @draw_trapezoid: draws a trapezoidal filled area
* @draw_glyph: draws a single glyph
* @part_changed: do renderer specific processing when rendering
* attributes change
* @begin: Do renderer-specific initialization before drawing
* @end: Do renderer-specific cleanup after drawing
* @prepare_run: updates the renderer for a new run
* @draw_glyph_item: draws a #PangoGlyphItem
*
* Class structure for #PangoRenderer.
*
* The following vfuncs take user space coordinates in Pango units
* and have default implementations:
* - draw_glyphs
* - draw_rectangle
* - draw_error_underline
* - draw_shape
* - draw_glyph_item
*
* The default draw_shape implementation draws nothing.
*
* The following vfuncs take device space coordinates as doubles
* and must be implemented:
* - draw_trapezoid
* - draw_glyph
*
* Since: 1.8
*/
struct _PangoRendererClass
{
/*< private >*/
GObjectClass parent_class;
/* vtable - not signals */
/*< public >*/
void (*draw_glyphs) (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y);
void (*draw_rectangle) (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height);
void (*draw_error_underline) (PangoRenderer *renderer,
int x,
int y,
int width,
int height);
void (*draw_shape) (PangoRenderer *renderer,
PangoAttrShape *attr,
int x,
int y);
void (*draw_trapezoid) (PangoRenderer *renderer,
PangoRenderPart part,
double y1_,
double x11,
double x21,
double y2,
double x12,
double x22);
void (*draw_glyph) (PangoRenderer *renderer,
PangoFont *font,
PangoGlyph glyph,
double x,
double y);
void (*part_changed) (PangoRenderer *renderer,
PangoRenderPart part);
void (*begin) (PangoRenderer *renderer);
void (*end) (PangoRenderer *renderer);
void (*prepare_run) (PangoRenderer *renderer,
PangoLayoutRun *run);
void (*draw_glyph_item) (PangoRenderer *renderer,
const char *text,
PangoGlyphItem *glyph_item,
int x,
int y);
/*< private >*/
/* Padding for future expansion */
void (*_pango_reserved2) (void);
void (*_pango_reserved3) (void);
void (*_pango_reserved4) (void);
};
PANGO_AVAILABLE_IN_1_8
GType pango_renderer_get_type (void) G_GNUC_CONST;
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_layout (PangoRenderer *renderer,
PangoLayout *layout,
int x,
int y);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_layout_line (PangoRenderer *renderer,
PangoLayoutLine *line,
int x,
int y);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y);
PANGO_AVAILABLE_IN_1_22
void pango_renderer_draw_glyph_item (PangoRenderer *renderer,
const char *text,
PangoGlyphItem *glyph_item,
int x,
int y);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_error_underline (PangoRenderer *renderer,
int x,
int y,
int width,
int height);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1_,
double x11,
double x21,
double y2,
double x12,
double x22);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_draw_glyph (PangoRenderer *renderer,
PangoFont *font,
PangoGlyph glyph,
double x,
double y);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_activate (PangoRenderer *renderer);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_deactivate (PangoRenderer *renderer);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_part_changed (PangoRenderer *renderer,
PangoRenderPart part);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_set_color (PangoRenderer *renderer,
PangoRenderPart part,
const PangoColor *color);
PANGO_AVAILABLE_IN_1_8
PangoColor *pango_renderer_get_color (PangoRenderer *renderer,
PangoRenderPart part);
PANGO_AVAILABLE_IN_1_38
void pango_renderer_set_alpha (PangoRenderer *renderer,
PangoRenderPart part,
guint16 alpha);
PANGO_AVAILABLE_IN_1_38
guint16 pango_renderer_get_alpha (PangoRenderer *renderer,
PangoRenderPart part);
PANGO_AVAILABLE_IN_1_8
void pango_renderer_set_matrix (PangoRenderer *renderer,
const PangoMatrix *matrix);
PANGO_AVAILABLE_IN_1_8
const PangoMatrix *pango_renderer_get_matrix (PangoRenderer *renderer);
PANGO_AVAILABLE_IN_1_20
PangoLayout *pango_renderer_get_layout (PangoRenderer *renderer);
PANGO_AVAILABLE_IN_1_20
PangoLayoutLine *pango_renderer_get_layout_line (PangoRenderer *renderer);
G_END_DECLS
#endif /* __PANGO_RENDERER_H_ */
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